7SR45 Device Manual - files.realpars.com

Reyrolle7SR45

V03.00

Device Manual

C53000-G7040-C101-2

Preface

Open Source Software

Table of Contents

Introduction 1Device Functionality 2Functions 3Technical Data 4Applications 5Functional Tests 6Appendix AIndex

ii NOTEFor your own safety, observe the warnings and safety instructions contained in this document, if available.

Disclaimer of LiabilitySubject to changes and errors. The information given inthis document only contains general descriptions and/orperformance features which may not always specificallyreflect those described, or which may undergo modifica-tion in the course of further development of the products.The requested performance features are binding only whenthey are expressly agreed upon in the concluded contract.Document version: C53000-G7040-C101-2.0Edition: 09.2020Version of the product described: V03.00

CopyrightCopyright © Siemens 2020. All rights reserved.The disclosure, duplication, distribution and editing of thisdocument, or utilization and communication of the contentare not permitted, unless authorized in writing. All rights,including rights created by patent grant or registration of autility model or a design, are reserved.

Preface

Purpose of the ManualThis manual provides an overview of the device family. It describes various functions (protection and supervi-sion) used, device technical data, and device applications.

Target AudienceThis manual is mainly intended for protection system engineers, commissioning engineers, persons entrustedwith the setting, testing and maintenance of automation, selective protection and control equipment, andoperational crew in electrical installations and power plants.

ScopeThis manual applies to the Reyrolle device family.

Further Documentation

[dw_7SR45_furtherdocumentation_devicemanual, 1, en_US]

• Device manualThe device manual describes the functions and applications of the Reyrolle device. The printed manualfor the device has the same informational structure.

• Hardware manualThe hardware manual describes the hardware building blocks and device combinations of the Reyrolledevice family.

Reyrolle, 7SR45, Device Manual 3C53000-G7040-C101-2, Edition 09.2020

• Operating manualThe operating manual describes the basic principles and procedures for operating and installing thedevices of the Reyrolle range.

• Communication protocol manualThe communication protocol manual contains a description of the protocols for communication withinthe Reyrolle device family and to higher-level network control centers.

• Security manualThe Security manual describes the security features of the Reyrolle 5 devices and Reydisp Manager.

• Engineering GuideThe engineering guide describes the essential steps when engineering with Reydisp Evolution. In addi-tion, the engineering guide shows you how to load a planned configuration to a Reyrolle device andupdate the functionality of the Reyrolle device.

• Reyrolle catalogThe Reyrolle catalog describes the system features and the devices of Reyrolle .

• Selection guide for Reyrolle and SIPROTECThe selection guide offers an overview of the device series of the Siemens protection devices, and adevice selection table.

Indication of Conformity

This product complies with the directive of the Council of the European Communitieson the harmonization of the laws of the Member States relating to electromagneticcompatibility (EMC Directive 2014/30/EU) and concerning electrical equipment for usewithin specified voltage limits (Low Voltage Directive 2014/35/EU) as well as restrictionon usage of hazardous substances in electrical and electronic equipment (RoHS Direc-tive 2011/65/EU).This conformity has been proved by tests conducted by Siemens AG in accordance ofthe Council Directive in accordance with the product standard IEC/EN 60255-26 for theEMC directives, and with the standard IEC/EN 60255-27 for the low-voltage directive.RoHS directive 2011/65/EU is met using the standard IEC/EN 63000.The device has been designed and produced for industrial use.

Additional SupportFor questions about the system, contact your Siemens sales partner.

Customer Support CenterOur Customer Support Center provides a 24-hour service.Siemens AGCustomer Support CenterHumboldtstraße 5990459 NurembergGermanyPhone: +49 911 6505 6505E-mail: [email protected]

Training CoursesInquiries regarding individual training courses should be addressed to our Training Center:Siemens AG Phone: +49 (911) 433-7415Siemens Power Academy TD Fax: +49 (911) 433-7929Humboldtstrasse 59 E-mail: [email protected]

Preface

4 Reyrolle, 7SR45, Device ManualC53000-G7040-C101-2, Edition 09.2020

mailto:[email protected]

mailto:[email protected]

90459 Nuremberg Internet: www.siemens.com/poweracademyGermany

Notes on SafetyThis document is not a complete index of all safety measures required for operation of the equipment (moduleor device). However, it comprises important information that must be followed for personal safety, as well asto avoid material damage. Information is highlighted and illustrated as follows according to the degree ofdanger:

! DANGERDANGER means that death or severe injury will result if the measures specified are not taken.

² Comply with all instructions, in order to avoid death or severe injuries.

! WARNINGWARNING means that death or severe injury may result if the measures specified are not taken.

² Comply with all instructions, in order to avoid death or severe injuries.

! CAUTIONCAUTION means that medium-severe or slight injuries can occur if the specified measures are not taken.

² Comply with all instructions, in order to avoid moderate or minor injuries.

NOTICENOTICE means that property damage can result if the measures specified are not taken.

² Comply with all instructions, in order to avoid property damage.

ii NOTEImportant information about the product, product handling or a certain section of the documentationwhich must be given attention.

Qualified Electrical Engineering PersonnelOnly qualified electrical engineering personnel may commission and operate the equipment (module, device)described in this document. Qualified electrical engineering personnel in the sense of this document arepeople who can demonstrate technical qualifications as electrical technicians. These persons may commission,isolate, ground and label devices, systems and circuits according to the standards of safety engineering.

Proper UseThe equipment (device, module) may be used only for such applications as set out in the catalogs and thetechnical description, and only in combination with third-party equipment recommended and approved bySiemens.

Preface


http://www.siemens.com/poweracademy

Problem-free and safe operation of the product depends on the following:

• Proper transport

• Proper storage, setup and installation

• Proper operation and maintenanceWhen electrical equipment is operated, hazardous voltages are inevitably present in certain parts. If properaction is not taken, death, severe injury or property damage can result:

• The equipment must be grounded at the grounding terminal before any connections are made.

• All circuit components connected to the power supply may be subject to dangerous voltage.

• Hazardous voltages may be present in equipment even after the supply voltage has been disconnected(capacitors can still be charged).

• Operation of equipment with exposed current-transformer circuits is prohibited. Before disconnecting theequipment, ensure that the current-transformer circuits are short-circuited.

• The limiting values stated in the document must not be exceeded. This must also be considered duringtesting and commissioning.

Selection of Used Symbols on the Device

Nr. Symbol Description

1 Direct current, IEC 60417, 5031

2 Alternating current, IEC 60417, 5032

3 Direct and alternating current, IEC 60417, 5033

4 Earth (ground) terminal, IEC 60417, 5017

5 Protective conductor terminal, IEC 60417, 5019

6 Caution, risk of electric shock

7 Caution, risk of danger, ISO 7000, 0434

8 Protective Insulation, IEC 60417, 5172, Safety Class II devices

9 Guideline 2002/96/EC for electrical and electronic devices

10 Guideline for the Eurasian Market

11 Mandatory Conformity Mark for Electronics and Electrotechnical Products in Morocco

12 South Korea KC Certification for Electrical and Electronic Products

Preface


Open Source Software

The product contains, among other things, Open Source Software developed by third parties. The OpenSource Software used in the product and the license agreements concerning this software can be found in theReadme_OSS. These Open Source Software files are protected by copyright. Your compliance with thoselicense conditions will entitle you to use the Open Source Software as foreseen in the relevant license. In theevent of conflicts between Siemens license conditions and the Open Source Software license conditions, theOpen Source Software conditions shall prevail with respect to the Open Source Software portions of the soft-ware. The Open Source Software is licensed royalty-free. Insofar as the applicable Open Source SoftwareLicense Conditions provide for it you can order the source code of the Open Source Software from yourSiemens sales contact – against payment of the shipping and handling charges – for a period of at least3 years after purchase of the product. We are liable for the product including the Open Source Softwarecontained in it pursuant to the license conditions applicable to the product. Any liability for the Open SourceSoftware beyond the program flow intended for the product is explicitly excluded. Furthermore any liabilityfor defects resulting from modifications to the Open Source Software by you or third parties is excluded. Wedo not provide any technical support for the product if it has been modified.The ReadmeOSS documents for the product can be found here: www.siemens.com/reyrolle



Table of Contents

Preface..........................................................................................................................................................3

Open Source Software..................................................................................................................................7

1 Introduction................................................................................................................................................111.1 7SR45 Overcurrent and Earth Fault Relay Overview............................................................121.2 Ordering Options.............................................................................................................. 14

2 Device Functionality................................................................................................................................... 172.1 Front Fascia...................................................................................................................... 182.1.1 Front Fascia ................................................................................................................ 182.1.2 Liquid Crystal Display...................................................................................................192.1.3 Keypad........................................................................................................................202.1.4 Light Emitting Diode (LED)...........................................................................................212.1.5 Local Flag.................................................................................................................... 232.1.6 Relay Information........................................................................................................ 242.2 Binary Inputs ....................................................................................................................262.3 Binary Outputs ................................................................................................................. 282.4 Pulse Output .................................................................................................................... 312.5 Remote Flag Output ......................................................................................................... 322.6 Reset LED, Trip Flag Indication, and Binary Outputs............................................................332.7 Data Storage.....................................................................................................................362.8 Real Time Clock ................................................................................................................ 37

3 Functions.................................................................................................................................................... 393.1 Functions Available in the 7SR45 Device............................................................................403.2 Instantaneous Overcurrent Protection (50) ....................................................................... 413.3 Time-Delayed Overcurrent Protection (51).........................................................................443.4 Instantaneous Derived Earth Fault Protection (50N) ..........................................................503.5 Time-Delayed Derived Earth Fault Protection (51N) ...........................................................533.6 Instantaneous Measured Earth Fault Protection (50G) .......................................................583.7 Time-Delayed Measured Earth Fault Protection (51G) ....................................................... 613.8 Switch onto Fault Protection (50LC/SOTF) .........................................................................663.9 Thermal Overload Protection (49) .....................................................................................713.10 2nd Harmonic Block/Inrush Restraint (81HBL2).................................................................. 75

4 Technical Data............................................................................................................................................ 774.1 General Device Data..........................................................................................................784.2 Instantaneous Overcurrent Protection (50)........................................................................804.3 Time-Delayed Overcurrent Protection (51).........................................................................81


4.4 Instantaneous Derived Earth Fault Protection (50N)...........................................................824.5 Time-Delayed Derived Earth Fault Protection (51N)............................................................834.6 Instantaneous Measured Earth Fault Protection (50G)....................................................... 844.7 Time-Delayed Measured Earth Fault Protection (51G)........................................................ 854.8 Switch On To Fault Protection (50LC/SOTF)........................................................................864.9 Thermal Overload Protection (49)......................................................................................874.10 2nd Harmonic Block/Inrush Restraint (81HBL2).................................................................. 88

5 Applications................................................................................................................................................895.1 Overview ......................................................................................................................... 905.2 Current-Transformer Requirements and Sample Calculations............................................. 915.2.1 Current-Transformer Requirements ............................................................................. 915.3 Time-Delayed Overcurrent (51/51G/51N) ..........................................................................955.4 Overcurrent Characteristics............................................................................................... 975.4.1 Selection of Overcurrent Characteristics ...................................................................... 975.4.2 Reset Delay .................................................................................................................975.5 Instantaneous Overcurrent (50/50G/50N) ......................................................................... 985.6 Thermal Overload (49)...................................................................................................... 995.7 Inrush Response .............................................................................................................1015.8 Inrush Detector (81HBL2) ...............................................................................................102

6 Functional Tests........................................................................................................................................1036.1 Commissioning Notes..................................................................................................... 1046.2 Before Testing.................................................................................................................1056.2.1 Safety........................................................................................................................1056.2.2 Sequence of Tests .....................................................................................................1056.2.3 Test Equipment ........................................................................................................ 1066.2.4 Use of Laptop Computer to Facilitate Testing .............................................................1066.3 Applying Settings............................................................................................................107

A Appendix.................................................................................................................................................. 109A.1 Connection Examples for RMU Application...................................................................... 110A.2 Connection Examples for Distribution Transformer Application........................................ 112A.3 Connection Examples for Phase and CBCT Measurement..................................................114A.4 Connection Examples for Earth-Fault Application.............................................................115A.5 Revision History.............................................................................................................. 116

Index.........................................................................................................................................................117

Table of Contents


Introduction

1.1 7SR45 Overcurrent and Earth Fault Relay Overview 121.2 Ordering Options 14

1


7SR45 Overcurrent and Earth Fault Relay OverviewThe 7SR45 Argus self powered/dual powered non-directional overcurrent and earth fault relay is a member ofthe Siemens Reyrolle protection devices Argus product family. The relay is developed using the latest genera-tion of hardware technology and is available in multiple variants depending on the following:

• CT ratings (1 A/5 A)

• Auxiliary power supply

• Communication configuration

• Binary inputs (2/4)

• Binary outputs (2/4)

• Pulse output

• Local/remote flag indicator

[sc_7SR45_argusrelay_devices, 1, en_US]

Figure 1-1 7SR45 Overcurrent and Earth Fault Relay

ii NOTEIn this Manual, the 7SR45 Argus self powered/dual powered non-directional overcurrent and earth faultrelay will be referred as 7SR45 Argus relay

1.1

Introduction1.1 7SR45 Overcurrent and Earth Fault Relay Overview


General Properties

• CT powered with option for an external auxiliary supply connection

• Dedicated switch-on-to-fault (SOTF) protection

• Self-monitoring – Including battery condition monitor

• High sensitivity – Trip ready at 20 % of Irated (1-phase) and 10 % of Irated (3-phase)

• Intelligent power management – Fail-safe startup and shut down modes

• Removable lithium battery backup for viewing fault data, setting the protection, and resetting of indica-tions

• 2 case options for mounting in various size RMUs

• Front Fascia with 5 non-programmable LEDs and 4 user programmable LEDs

• Mechanical flag for trip indication Communication Protocols Supported

• IEC 60870-5-103

• Modbus RTU

Device Functionality OverviewThe 7SR45 Argus relay includes protection and supervision functions. The relay provides both definite-timeand inverse-time overcurrent and earth fault protection functions. The relay is CT powered with an option forconnection to an external auxiliary supply.The relay functionality can be configured via a front USB port for local PC connection or rear electrical RS485(optional) port for remote connection. By using the Reydisp Evolution software, the user can update thesettings and view the fault records (trip log) and the event records (event log).The relay supports the IEC 60870-5-103 and MODBUS‑RTU communication protocols which helps in estab-lishing connection to SCADA. The relay can indicate the trip with local and remote flag indicator based on theordering options. Main function Overcurrent and Earth-Fault ProtectionInputs and outputs 4 current transformers with

• 1 A or 5 A inputs• 2 or 4 binary inputs• 2 or 4 binary outputs• Pulse output• Local/remote flag indicator

Communication Front USB port (for configuration via Reydisp Evolution) and rear RS485 port(optional)

Housing Size 4 – non draw‑out case with mounting options available in standard 4U rackheight or height-reduced side-mounting arrangement

Introduction1.1 7SR45 Overcurrent and Earth Fault Relay Overview


Ordering OptionsOrdering Information – 7SR45 Argus

Product Description Order Number1 2 3 4 5 6 7 – 8 9 10 11 12 – 13 14 15 16

Non-Directional Overcurrent and EarthFault Relay

7 S R 4 5 0 – 0 – 1 A 0

| | | | | | |Case I/O and Fascia | | | | | | |Size 4 moulded case, 4 CT1, 2 BI/2 BO, pulse output, 9 LEDs 1 | G A/

B| | |

Size 4 moulded case, 4 CT1, 2 BI/2 BO, pulse output, 9 LEDs 1 | H/J A | | |Size 4 moulded case, 4 CT1, 4 BI/4 BO, pulse output, 9 LEDs 2 | H/J B | | |Size 4 moulded case (height reduced), 4 CT1, 2 BI/2 BO, pulse output,9 LEDs

3 | G A/B

| | |

Size 4 moulded case (height reduced), 4 CT1, 2 BI/2 BO, pulse output,9 LEDs

3 | H/J A | | |

Size 4 moulded case (height reduced), 4 CT1, 4 BI/4 BO, pulse output,9 LEDs

4 | H/J B | | |

| | | | | |Measuring Input | | | | | |1 A, 50 Hz/60 Hz 1 | | | | |5 A, 50 Hz/60 Hz 2 | | | | |

| | | | |Auxiliary Voltage | | | | |Self powered (CT powered : BI threshold DC 19 V) G | 1 | |Dual powered (CT powered + Aux. powered : DC 24 V to 60 V, BI threshold: DC19 V)

H | 2 | |

Dual powered (CT powered + Aux. powered : AC 60 V to 240 V/DC 60 V to 240 V,BI threshold: AC 88 V/DC 88 V)

J | 2 | |

| | | |Front Fascia | | | |Standard version A | | |Standard version – with trip flag indicator B | | |

| | |Communication Options | | |Front port : USB 1 | |Front port: USB and rear port: RS485 supporting IEC 60870-5-103 and Modbus RTU (user-selectable setting)

2 | |

| |Protection Function Packages A |49 Thermal overload2 |50 Instantaneous overcurrent – phase |50G Instantaneous earth fault – measured |50LC Line check/Switch onto fault |50N Instantaneous earth fault – calculated |

1.2

1 4CT is configured as 3-Phase Fault + Earth Fault2 Not available for 7SR450[1/3]-xGA10-1AA0 MLFB variants

Introduction1.2 Ordering Options


Product Description Order Number51 Time-delayed overcurrent – phase |51G Time-delayed earth fault – measured |51N Time-delayed earth fault – calculated |81HBL2 Inrush detector2 |Conformal coating |Standard version – No conformal coating on PCBA AConformal coating on PCBA B

Ordering Information – 7SR45 Argus Spares and Accessories

Variants Description7XG1900-1AA00-0AA0 Main battery CR123A 37XG1900-2AA00-0AA0 RTC battery CR1632 3

7XG1900-3AA00-0AA0 Main battery CR123A + RTC battery CR1632 37XG1900-0MA54-0FC0 Transparent front cover for height reduced

7SR4503/7SR4504 variants7XG1900-0MA55-0FC0 Surface mounting bracket7XG1900-0MA56-0FC0 CT terminal cover for IP20

3 Siemens recommends to procure these battery spares from local market.

Introduction1.2 Ordering Options



Device Functionality

2.1 Front Fascia 182.2 Binary Inputs 262.3 Binary Outputs 282.4 Pulse Output 312.5 Remote Flag Output 322.6 Reset LED, Trip Flag Indication, and Binary Outputs 332.7 Data Storage 362.8 Real Time Clock 37

2


Front Fascia

Front Fascia

The front fascia is part of the relay. It is designed to provide a user-friendly method of entering the settingsand retrieving data from the relay. You can access all of the push-buttons and perform the setting changes.The front fascia contains 5 predefined LED lists which provide the information about the LED indicators and apaper label for 4 user-programmable LEDs. By using the TEST/RESET keys, the fascia provides the followingoptions:

• Read and acknowledge the fault log

• Acknowledge and reset the LED and local flag indications

• Test and operate the binary outputs

• Reset the latched binary outputs

Front Fascia with Flag Output

[dw_7SR45_frontfascia_withflagoutput, 1, en_US]

Figure 2-1 Front Fascia with Flag Output

2.1

2.1.1

Device Functionality2.1 Front Fascia


Front Fascia without Flag Output

[dw_7SR45_frontfascia_withoutflagoutput, 1, en_US]

Figure 2-2 Front Fascia without Flag Output

ii NOTE7SR45 Argus Relay devices (7SR450/FF and 7SR450/EE) having the front fascia label with 9 non-program-mable LEDs can be upgraded with the latest firmware release 2438H8001R2f-1a.In this case, you can use one of the following approaches:

• Use the device as it is with the non-programmable LED front fascia, map the LEDs L4 to L7 to thedefault settings that is, LED 4 → IL1/A; LED 5 → IL2/B; LED 6 → IL3/C; and LED 7 → IE/E.

• Stick a paper label on top of LED L4 to L7, similar to as shown in Figure 2-1, Figure 2-2. These LEDs canthen be mapped to any desired function as needed.

Liquid Crystal Display

A 2 line by 16 character alpha-numeric liquid crystal displays information of settings mode, instrument modeand fault data mode.

[sc_lcd_display, 1, en_US]

Figure 2-3 7SR45 Relay LCD

By using the LCD, you can view or edit a configuration parameter and view the following:

• Real-time state of a relay such as BI and BO

2.1.2



• Battery profile

• Auxiliary-power status

• Primary and secondary current values of each phase and earth

• General alarms The LCD displays the stored fault information to the operator. When any fault condition occurs, the relaydisplays the latest fault information on the LCD.General alarms are user-defined text messages displayed on the LCD when mapped to binary inputs. Up to 4general alarms can be programmed, each triggered from 1 or more inputs. Each general alarm also generatesan event.If the 7SR45 Argus Relay is powered on with phase CT input and the current is more than 0.4 ⋅ Irated (1 phase)or 0.14 ⋅ Irated (3 phases), the backlight turns on automatically. If the 7SR45 Argus Relay is energized withcurrent less than the defined limits, the backlight does not turn on.If the 7SR45 Argus Relay is powered on by inserting a USB cable, the backlight turns on automatically. Thebacklight can be turned off manually by pressing the backlight key. If you do not perform any activity in theHMI for more than 30 s, the backlight turns off automatically to save energy.In the phase CT power mode, the 7SR45 Argus Relay periodically monitors whether sufficient current is avail-able to turn on the backlight.In the USB or battery power mode, if the backlight is already turned on and if the phase CT input is provided,the backlight turns off due to the switching of the power mode from USB or battery to CT power. If sufficientcurrent is available then the backlight can be turned on again.For more information about the power source, refer to the Modes of Operation chapter in the 7SR45 Oper-ating Manual.

Keypad

The 7SR45 Argus Relay keypad consists of 5 standard keys for navigation and for editing the values. Thestandard keys are used to navigate the menu structure and configure the relay functions.2 additional keys are available for LCD backlight and battery mode.The keys are used for the following functions:

• To display and edit the relay settings

• To display the relay instrumentation and fault data

• To reset the relays output and LEDs

Keys DescriptionThis push-button is used to navigate the menu structure or to increase theparameter value in the edit mode.

This push-button is used to navigate the menu structure or to decrease theparameter value in the edit mode.

This push-button is used to reset the fault indication on the fascia. This push-button is also used for selecting the menu or selecting parameter values inthe edit mode. By using this push-button, you can acknowledge the LEDs,binary output, and trip flag indication.

2.1.3



Keys DescriptionThis push-button is used for selecting the parameter or confirming the values.The ENTER push-button is used to initiate and accept the setting changes.Press ENTER to edit the parameter setting. The setting value flashes and canbe changed by using the or keys.

This push-button is used to return the relay display to its initial status or onelevel up in the menu structure. Press CANCEL to return to the previous menuor to cancel the value.This push-button is used to reject any alterations to a setting while in the editmode.Press the CANCEL key repeatedly to return to the Relay Identifier screen.This push-button is used to power on and power off the relay with batterypower when the auxiliary power, CT power, and USB power are not available.

This push-button is used to turn on and turn off the backlight.

Light Emitting Diode (LED)

Indication LEDsThe 7SR45 Argus relay provides 5 non-programmable LEDs and 4 user-programmable LEDs. The LED indicatesthe operating status of the relay such as TRIP READY and PICKUP.The LED functions are:

Table 2-1 LED Functions

LEDs Predefined Names Indication Color FunctionsLED 1 PROT. HEALTHY GREEN Indicates the relay protection function in a

healthy stateLED 2 TRIP RED The trip indication for the phase/earth faultsLED 3 PICKUP AMBER The pickup indication for the phase/earth faultsLED 4 IL1 / A4 RED LEDs L4 – L7 are user-programmable LEDs. They

indicate when the respective mapped function istriggered.By default, these LEDs are mapped to phases andprovide trip indication for the phase/earth faults.

LED 5 IL2 / B4 REDLED 6 IL3 / C4 REDLED 7 IE / E4 REDLED 8 TRIP READY GREEN Indicates that the relay has sufficient energy

available for trippingLED 9 LOW BATTERY AMBER The battery voltage is less than the operating

level

Protection Healthy LEDThe steady illumination of Protection Healthy LED indicates that the required CT current 0.20 ⋅ Irated (minimumphase current) in 1-phase or 0.10 ⋅ Irated (minimum phase current) in 3-phase or auxiliary power supply isapplied to the relay and the relay is functioning healthy.

2.1.4

4 Default factory setting. Can be programmed as per user requirements.



Trip Ready LEDThe steady illumination of Trip Ready LED indicates that required CT current 0.20 ⋅ Irated (minimum phasecurrent) in 1-phase or 0.10 ⋅ Irated (minimum phase current) in 3-phase or auxiliary power supply is applied tothe relay and the relay is having sufficient energy to trip through the impulse output.

Low Battery LEDThe low battery LED indicates when the battery voltage falls below the sufficient operating voltage.

User-Programmable LEDsThe 7SR45 Argus Relay consist of 4 user-programmable LEDs which can be configured to protection andmiscellaneous functions. The LEDs (L4 to L7) are programmed to be illuminated as RED. The 4 user-program-mable LEDs are mapped to Phase IL1/A, IL2/B, IL3/C, IE/E by default.

User-Programmable LED ConfigurationThe 4 user-programmable LEDs are assigned to any functions using OUTPUT CONFIG > OUTPUT MATRIXmenu.The 4 user-programmable LEDs are mapped to Phase IL1/A, IL2/B, IL3/C, IE/E by default. This default configura-tion shall be printed on one side of the paper label provided with the decal. If you decide to change the config-uration for the programmable LEDs, then you must write the name of the function (to which the program-mable LED is mapped) on the rear side of the paper label provided with the decal.If the LEDs are mapped to any protection or phase function, then they will be turned ON when the functiontrips. For example if an LED is mapped to the 51-1 function, then the LED will be turned ON when the relaytrips due to 51-1 fault.If the LEDs are mapped to a miscellaneous function, then the LEDs turn ON as and when the event occurs. Forexample if the LED is mapped to BI 1 operated, then the LED is turned ON when BI 1 input is present.

Table 2-2 Binary Output ‑ LED Default Value

Parameters Description LED Default Value50-1 50-1 element operate –50-2 50-2 element operate –51-1 51-1 element operate –50N-1 50N-1 element operate –50N-2 50N-2 element operate –51N-1 51N-1 element operate –50G-1 50G-1 element operate –50G-2 50G-2 element operate –51G-1 51G-1 element operate –50LC 50LC/SOTF element operate –49 Trip 49 trip element operate –49 Alarm 49 capacity alarm element operate –81HBL2 Inrush element operate –Active Grp 1 Active Group 1 –Active Grp 2 Active Group 2 –General Pickup5 Pickup detected XIL1 / A Phase A tripped L4IL2 / B Phase B tripped L5IL3 / C Phase C tripped L6

5 LEDs cannot be mapped to General Pickup, Prot'n Healthy, Low Battery and IRF. A X shall appear in the HMI for these functions. InReydisp Evolution, LED configuration for these functions is disabled.



Parameters Description LED Default ValueIE / E Phase E tripped L7Prot'n Healthy5 Protection healthy XLow Battery5 Battery volts low indication XIRF Internal relay failure XLocal mode Local mode –Remote mode Remote mode –Out of Service mode Out of service mode –BI1 Operated BI1 operated –BI2 Operated BI2 operated –BI3 Operated BI3 operated –BI4 Operated BI4 operated –Reclose Inhibit Interlock for reclose of CB after 49 trip –

For more details on Binary Outputs, refer to 2.3 Binary Outputs .

User-Programmable LED OperationsThe 4 user-programmable LEDs can be configured as Self Reset or Hand Reset (default). This is configuredunder OUTPUT CONFIG > LED CONFIG.

Parameters Description LED Default ValueL4 L4 self reset or hand reset 0 (hand reset)L5 L5 self reset or hand reset 0 (hand reset)L6 L6 self reset or hand reset 0 (hand reset)L7 L7 self reset or hand reset 0 (hand reset)

If the LED is configured as Self Reset, then it is turned ON when the function is active and turned OFF whenfunction resets. In case the device goes to sleep when the LED was ON, then on device wakeup the LEDremains turned ON as long as the configured function is still active.If the LED is configured as Hand Reset, then the LED is turned ON when the function is active. The LEDremains ON even after the configured function resets. In case the device goes to sleep when the LED wasturned ON, then on device wakeup the LED remains turned ON irrespective of the configured function status.The LED can only be reset by pressing TEST/RESET key, BI - Rst LEDs & O/Ps function and through Modbusor IEC103 commands.

Local Flag

Local flag is an electromechanical bi-stable flag fitted in the front fascia to indicate the trip condition. Thestatus of the flag is GREEN in normal operation and turns RED during the trip condition.

ii NOTEThe auxiliary voltage or phase currents provide the energy required to show the trip indication.The flag indicates a trip indication when any protection function operates or any binary inputs are mappedto a trip pulse output.The trip indication is retained even in the absence of auxiliary voltage and phase currents.The trip indication can be reset with any power mode by pressing the TEST/RESET key. Refer to theModes of Operation chapter in the 7SR45 Operating Manual.

2.1.5



Relay Information

The name plate contains the following product information:

• Product name

• Auxiliary voltage range

• Rated burden

• Rated current

• Rated frequency

• Binary-input voltage

• MLFB ordering code, with hardware-version suffix

• Serial number

[dw_7SR45_relayinfo, 2, en_US]

Figure 2-4 Relay Information

Where:

• GF – Goa factory

• YY – Year of manufacturing

• MM – Month of manufacturing

• XXXXXX – Serial number of the relayFor safety reasons, the following warning symbols are displayed on the label.

2.1.6



Symbol DescriptionDielectric test voltage 2 kV

Impulse test voltage 5 kV

Caution: Refer to equipment documentation

Caution: Risk of electric shock

Guidelines for Eurasian Markets

European CE marking

“WEEE" Symbol instructions.The product should not be disposed with other wastes at the end of its working life.Please separate the product from other types of wastes and recycle it responsibly topromote the sustainable reuse of material resources. This will help prevent harm to theenvironment or human health from uncontrolled waste disposal.Mandatory Conformity Mark for Electronics and Electrotechnical Products in Morocco

South Korea KC Certification for Electrical and Electronic Products



Binary Inputs Overview

The binary inputs (BI) are optocouplers operated from a suitably rated AC/DC power supply.The device variant with AC/DC power supply has binary inputs with an operating threshold of AC/DC 88 V.Devices with DC auxiliary power supply have binary inputs with a threshold of DC 19 V.The status of BI can be viewed via LCD or Reydisp Evolution software or SCADA.The 7SR45 Argus Relays are available with 2 or 4 binary inputs. You can assign any binary input to any of theavailable functions such as inhibits, binary outputs, reset flags, and general alarms under INPUT CONFIG >INPUT MATRIX. The binary input can also be mapped to operate the pulse output in the presence of auxiliarypower supply/CT input.Pickup (PU) and Dropoff (DO) time delays are associated with each binary input. Where no pickup delay hasbeen applied, the input may pick up due to induced AC voltage on the wiring connections (for example, crosssite wiring). The default pickup time of 20 ms provides AC immunity.Each input can be configured independently. Each input can be logically inverted to facilitate integration ofthe relay within the user scheme. When inverted, the relay indicates that the BI is triggered when no binaryinput voltage is applied. Inversion occurs before the PU and DO time delay.Binary inputs can be configured for instantaneous operation from DC 19 V power supply by setting the pickuptimer to 0 ms and the dropout timer to 25 ms.Each binary input can be assigned to any binary output and it allows the relay to provide panel indications andalarms.

Binary Input Logic

[lo_binary-input, 1, en_US]

Figure 2-5 Binary Input Logic

Binary Input Details

Table 2-3 Binary Input

Parameters Description Default Value Min Max Step ChangeInhibit 50-1 50-1 element block – – 1 –Inhibit 50-2 50-2 element block – – 1 –Inhibit 51-1 51-1 element block – – 1 –Inhibit 50N-1 50N-1 element block – – 1 –Inhibit 50N-2 50N-2 element block – – 1 –Inhibit 51N-1 51N-1 element block – – 1 –

2.2

Device Functionality2.2 Binary Inputs


Parameters Description Default Value Min Max Step ChangeInhibit 50G-1 50G-1 element block – – 1 –Inhibit 50G-2 50G-2 element block – – 1 –Inhibit 51G-1 51G-1 element block – – 1 –Inhibit 50LC 50LC/SOTF element block – – 1 –Inhibit 496 49 element block – – 1 –Inhibit 81HBL2 6 Inrush element block – – 1 –Select Group 1 6 Select group 1 – – 1 –Select Group 2 6 Select group 2 – – 1 –Rst LEDs & O/Ps Reset LEDs and BOs – – 1 –Trip Pulse O/P Pulse output – – 1 –Local Mode 6 Local mode – – 1 –Remote Mode 6 Remote mode – – 1 –Local or Remote Mode 6 Local or remote mode – – 1 –Out of Service Mode 6 Out of service mode – – 1 –General Alarm-1 Display general alarm-1

text– – 1 –

General Alarm-2 Display general alarm-2text

– – 1 –

General Alarm-3 7 Display general alarm-3text

– – 1 –

General Alarm-4 7 Display general alarm-4text

– – 1 –

Binary Input Configuration

Parameters Description DefaultValue

Min Max Step Change

Inverted inputs Input inversion – – 1 –BI-n pickup Pickup delay 0.020 0 s 20 s 0.01

≥ 20 s 100 s 0.1≥ 100 s 600 s 1

BI-n dropoff Dropoff delay 0.000 0 s 20 s 0.01≥ 20 s 100 s 0.1≥ 100 s 600 s 1

Enabled in local Enabled in local mode 1 (all BIs) – 1 –Enabled in remote Enabled in remote mode 1 (all BIs) – 1 –

ii NOTEIf the binary input is connected and energized when the device is in sleep mode, depending on the numberof binary inputs, the sleep mode current increases.

ii NOTEWhen any binary input is assigned to the trip pulse output and when the TEST/RESET key is pressed, aFAULT/MAINT PERSISTS pop-up appears.

6 For the 7SR450[1/3]-xGA10-1AA0 variant, this parameter is not available.7 For 7SR450[1/3] variants, this parameter is not available.

Device Functionality2.2 Binary Inputs


Binary Outputs Overview

The 7SR45 Argus Relay provides 2 or 4 binary outputs which can be configured to send commands to theswitchgear units and annunciations for remote signaling of the important events and status.The binary output can be assigned to any available functions under OUTPUT CONFIG > OUTPUT MATRIXmenu.

Binary Output Configuration In the default operating mode, binary outputs are self reset and remain energized until the triggering condi-tion exists. If required, the binary outputs can be programmed to operate as hand reset.

ii NOTEThe binary output 1 and binary output 2 only can be configured as hand reset. The binary output 3 andbinary output 4 are always of self reset type. The minimum operating time is 20 ms.

For 7SR450[1/3]-xGA10-1AA0In the default operating mode, binary outputs are self reset. If required, the outputs can be programmed tooperate as hand reset. However, the hand reset functionality is applicable for protection trip signals, IRFsignal, and BI signals only.All the supervisory signals such as low battery, general pick up, and protection healthy are always of self resettype.By default, the binary output 1 is mapped to IRF function and programmed as hand reset. In the self resetcondition, the binary output resets if the input current drops below the sensitivity levels.

ii NOTEIn the absence of auxiliary voltage, the binary output 3 and binary output 4 will not be functional andremain in the non-operated condition.

2.3

Device Functionality2.3 Binary Outputs


Binary Output Logic

[lo_binary-output, 1, en_US]

Figure 2-6 Binary Output Logic

(1) OUTPUT CONFIG > OUTPUT MATRIX(2) OUTPUT CONFIG > BO CONFIG

Binary Output Details

Table 2-4 Binary Output


Min Max Step Change

50-1 50-1 element operate – – 1 –50-2 50-2 element operate – - 1 –51-1 51-1 element operate – - 1 –50N-1 50N-1 element operate – – 1 –50N-2 50N-2 element operate – – 1 –51N-1 51N-1 element operate – – 1 –50G-1 50G-1 element operate – – 1 –50G-2 50G-2 element operate – – 1 –51G-1 51G-1 element operate – – 1 –50LC 50LC/SOTF element

operate– – 1 –

49 Trip 8 49 trip element operate – – 1 –49 Alarm8 49 capacity alarm

element operate– – 1 –

81HBL28 Inrush element operate – – 1 –Active Grp 18 Active Group 1 – – 1 –Active Grp 28 Active Group 2 – – 1 –

8 For the 7SR450[1/3]-xGA10-1AA0 variant, this parameter is not available




Min Max Step Change

General Pickup Pickup detected – – 1 –IL1 / A9 Phase A tripped X – 1 –IL2 / B9 Phase B tripped X – 1 –IL3 / C9 Phase C tripped X – 1 –IE / E9 Phase E tripped X – 1 –Prot'n Healthy Protection healthy – – 1 –Low Battery Battery volts low indica-

tion– – 1 –

IRF Internal relay failure 1 (BO1), –(Others)

– 1 –

Local mode 8 Local mode – – 1 –Remote mode 8 Remote mode – – 1 –Out of Service mode 8 Out of service mode – – 1 –BI1 Operated BI1 operated – – 1 –BI2 Operated BI2 operated – – 1 –BI3 Operated 10 BI3 operated – – 1 –BI4 Operated 10 BI4 operated – – 1 –Reclose Inhibit 8 Interlock for reclose of

CB after 49 trip– – 1 –

ii NOTEIf a binary output is assigned to IRF, do not use the same binary output for any other functions.

ii NOTEThe Reclose Inhibit parameter is only available in dual powered variants. Siemens recommendsconfiguring this parameter with permanent auxiliary power.

Binary Output Operations The relay reset can be performed from the Relay Identifier Screen > TEST/RESET key.If the fault current persists and if you press the TEST/RESET key, then the pop-up message appears, FAULTPERSISTS.Based on the availability of the power source, the flag can be reset using any one of the following conditions: BO Trip/Reset on Battery/USB In this mode, the relay uses the power from the battery/USB to operate or reset the binary output and takesapproximately 4 s.If the consecutive commands are provided within 4 s, then the relay performs delayed operations and displaysINSUFFICIENT ENERGY as a pop-up message on the HMI. BO Trip/Reset on CT Input or Auxiliary Voltage In this mode, the relay can operate or reset the binary outputs instantaneously.

9 BO cannot be mapped to IL1 / A, IL2 / B, IL3 / C & IE / E. The HMI will display X for these functions. In Reydisp Evolution, LED configu-ration for these functions is disabled.

10 For all 7SR450[1/3] variants, this parameter is not not available.



Pulse Output The pulse output is used to interface directly with the low energy circuit-breaker trip coil. The pulse outputprovides 24 V, 0.1 Ws pulses of 50 ms on and 500 ms off.The pulse output operates when any configured protection function trips. The trip energy for the trip coil isstored in a capacitor built into the protection device. The capacitors are charged with the auxiliary powersupply/phase current. The pulses are repeated until the fault current falls below the set value. The pulseoutput does not require any mapping with protection functions.In the presence of auxiliary power supply/phase current, the pulse output operates when it is mapped to abinary input. When the assigned binary input is triggered, the pulse output operates, local flag operates, andTrip LED flashes. The pulse output operates until the auxiliary power supply/phase current is available.

ii NOTEThe time between 2 pulses depends on the impedance of the trip coil and magnitude of the current (if therelay is powered via phase currents).When there is no load connected at the output of pulse output (no trip coil is connected), the pulse onduration varies from 50 ms to 70 ms.The pulse output cannot be triggered via rear/font communication protocols, Siemens recommends usingbinary inputs for triggering the pulse output for remote trip applications.

2.4

Device Functionality2.4 Pulse Output


Remote Flag Output The remote flag output is used to indicate the trip via an external flag. The remote flag output provides 24 V,0.01 Ws pulses of 50 ms on and 500 ms off.The remote flag output operates when any protection function trips. The energy is stored in a capacitor builtinto the protection relays. The capacitor is charged with an auxiliary voltage or phase current. The pulses arerepeated until the fault current falls below the set value. The remote flag output does not require anymapping with protection functions.

ii NOTEThe time between the 2 pulses depends on the impedance of the flag indicator and on the current level (ifthe relay is powered with an auxiliary power/phase current).

2.5

Device Functionality2.5 Remote Flag Output


Reset LED, Trip Flag Indication, and Binary OutputsDepending upon the binary output configurations set to operate the protection functions, the configuredbinary outputs, local and remote trip flag indications, trip and respective phase or earth LEDs operate and latchafter the TRIP command is issued by the protection functions.By using the reset flag functionality, you can reset binary outputs, LEDs, and local trip flag indication.You can reset the binary output/LEDs in any one of the following methods:

• Binary input

• Reydisp Evolution software

• TEST/RESET key

• Reset via rear communication protocolAfter successful reset of binary outputs, local flags, and LEDs, the FLAGS RESET message appears on the LCDand all the LEDs flashes and reset.In the CT power mode, if the current is more than 0.4 ⋅ Irated (1 phase) or 0.14 ⋅ Irated (3 phase), LED test can beperformed.If the fault current persists, then a pop-up message FAULT PERSISTS appears on the LCD.The LED Test/Reset function will not be operational when Inrush detector is active.

Reset through Binary InputIn the INPUT MATRIX configuration, LEDs and outputs can be reset by configuring the binary input. Theconfiguration can be executed with Reydisp Evolution or Human Machine Interface (HMI).

2.6

Device Functionality2.6 Reset LED, Trip Flag Indication, and Binary Outputs


[sc_rstleds_bos, 1, en_US]

Figure 2-7 Reset LEDs Outputs: Reydisp Software Input Matrix

Reset using Reydisp SoftwareWhen the relay is latched, LEDs can be reset by sending an appropriate command over the data communica-tion channels using Reydisp software.In the Reydisp Evolution screen, navigate to Relay > Control and click Reset Flags.



[sc_resetflags, 1, en_US]

Figure 2-8 Reset Flags

TEST/RESET KeyFrom the Relay Identifier screen, reset the LEDs and outputs by pressing the TEST/RESET key.

Reset through Rear Communication ProtocolThe resetting of LEDs and BOs is possible via the rear communication protocol like Modbus RTU and IEC 60870-5-103.



Data StorageThe relay stores 2 types of data: Fault records, event records.Data records are stored in the non-volatile memory. The Data Storage menu contains the settings for clearingevents and faults.

Fault Records (Trip Log) The fault records are generated when the protection function detects a fault condition and the trip alertmessage appears on the LCD. Up to 10 fault records can be stored and displayed on the fascia LCD.The fault record provides a summary of the following relay status:

• Settings group

• Element that issued the trip

• Any phase/earth picked up

• Fault magnitude

• LED indications

• General alarm

• Date and timeThe trip alert message is displayed until you acknowledge the fault.The fault and event records provide the full sequence of events that results to a trip for analysis.The fault records are stored in a rolling buffer with the oldest faults overwritten. The fault storage can becleared with the DATA STORAGE > Clear Faults setting in HMI

Event Records (Event Log) The event recorder feature allows the time tagging of any status change (Event) in the relay. When an eventoccurs, the actual event condition is logged as a record with a date and time stamp to a resolution of 1 ms.The relay can store a maximum of 100 event records. When the operational log is full, any new record over-writes the old records.Stored events can be cleared by using the DATA STORAGE > Clear Events setting in HMI or from ReydispEvolution.The following events are logged:

• Status change of binary outputs

• Status change of binary inputs

• Change of settings

• Device startup and shut down

• Protection element operation

• Critical or low battery

• General alarm

• Internal Relay Failure (IRF)The Thermal level of the device can be cleared using the DATA STORAGE > Reset Thermal Level settingin HMI or from Reydisp Evolution.

ii NOTEFault and Event records must be downloaded before uploading the device firmware.

2.7

Device Functionality2.7 Data Storage


Real Time Clock The time and date can be set either via the relay fascia using appropriate commands in the SYSTEM CONFIGmenu or using the Reydisp software. When the relay is de-energized, the CR1632, 3 V 140 mAh Li/MnO2 coincell batteries maintains the time and date.The relay can be synchronized to the nearest second or minute using the Reydisp software. The device canhave a drift of ± 6 s/day.

Table 2-5 Real Time Clock

Attribute ValueAccuracy (-10 °C to 60 °C) ± 70 p.p.m

The default date is set as 01/01/2014 to indicate that the date is not set. In the relay, only the hours andminutes can be edited. When you press ENTER after editing the seconds, seconds are set to zero and the clockstarts.By default, the clock follows a 24 hour format for time and DD/MM/YYYY format for date.

2.8

Device Functionality2.8 Real Time Clock



Functions

3.1 Functions Available in the 7SR45 Device 403.2 Instantaneous Overcurrent Protection (50) 413.3 Time-Delayed Overcurrent Protection (51) 443.4 Instantaneous Derived Earth Fault Protection (50N) 503.5 Time-Delayed Derived Earth Fault Protection (51N) 533.6 Instantaneous Measured Earth Fault Protection (50G) 583.7 Time-Delayed Measured Earth Fault Protection (51G) 613.8 Switch onto Fault Protection (50LC/SOTF) 663.9 Thermal Overload Protection (49) 713.10 2nd Harmonic Block/Inrush Restraint (81HBL2) 75

3


Functions Available in the 7SR45 DeviceThis section describes the functions available in the 7SR45 device. The relay provides protection functions andsupervision functions as described below.

Protection Functions

• Instantaneous overcurrent protection (50)

• Time‑delayed overcurrent protection (51)

• Instantaneous derived earth fault protection (50N)

• Time‑delayed derived earth fault protection (51N)

• Instantaneous measured earth fault protection (50G)

• Time‑delayed measured earth fault protection (51G)

• Switch-On-To-Fault (50LC/SOTF)

• Thermal overload protection (49)

Supervision Functions

• 2nd Harmonic block/inrush restraint (81HBL2)

3.1

Functions3.1 Functions Available in the 7SR45 Device


Instantaneous Overcurrent Protection (50)Overview of the Function (50)

The instantaneous overcurrent protection is used to provide:

• Short-circuit detection in electric equipment

• High-speed highset overcurrent protection

• Coordinated operation with other devices using current and time-graded settings

Structure of the Function (50)The instantaneous overcurrent protection function element has group-dependent settings. These settings canbe different in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system current using the 3-phase current transformer inputs, for exampleCT1/2/3.The instantaneous overcurrent protection function (50) is characterized by the following:

• Current measurement is based on the fundamental component of the current.

• Operation with a Definite Time Lag (DTL) characteristic.

• LED operations are provided for each phase. A general pickup and 50-n output are provided.

3.2

Functions3.2 Instantaneous Overcurrent Protection (50)


Logic of the Function (50-n)

[lo_7sr45_InstantaneousOvercurrentFn, 1, en_US]

Figure 3-1 Logic Diagram of the Instantaneous Overcurrent Protection (50)

Application and Settings NotesGn 50-n ElementDefault setting: DisabledThis setting is used to allow the element to be switched on and off based on the user requirement. A separatesetting is provided for each element. The settings of the individual element can be configured independentlyof each other.Parameter State DescriptionDisabled The element is inactiveEnabled The element is active

Gn 50-n SettingDefault setting = 1.0 ⋅ Irated

This setting defines the operating current threshold of the element. The applied phase current must exceedthis setting by a factor of 1.00x for pickup of the element. The operation time will then be dependent on theselected delay for the element setting. The element pickup will reset when the current is reduced under thefollowing conditions:

• 0.2 ⋅ Irated to 0.9 ⋅ Irated is ≥ 90 % Iop




This setting is set to suit the individual application. Gn 50-n DelayDefault setting = 0.00 sThis setting is set to suit the individual application. Gn 50-n Inrush ActionDefault setting = OffHigh levels of inrush currents into reactive components, for example transformers; when they are switched incan result in operation of overcurrent elements. The inrush current can be detected by the 81HBL2 element.This parameter can be configured to inhibit the overcurrent element automatically.Parameter State DescriptionOff The element is not inhibited by operation of the 81HBL2 element.Inhibit The overcurrent element is inhibited by operation of the 81HBL2 element and

automatically released when the 81HBL2 element resets.

Settings Menu

CONFIGURATION > FUNCTION CONFIGParameter Setting Options Settings

Default Gn1 Gn2Gn Phase O/C Disabled

EnabledDisabled – –

CONFIGURATION > CURRENT PROT'N > PHASE O/C > 50-nParameter Setting Options Settings

Default Gn1 Gn2Gn 50-n Element Disabled


Gn 50-n Setting 0.2 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated

1 ⋅ Irated – –

Gn 50-n Delay 0 s to < 20 sΔ 0.01 s

0 s – –

≥ 20 s to < 100 sΔ 0.1 s≥ 100 s to 600 sΔ 1 s

Gn 50-n Inrush Action OffInhibit

Off – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 50-n Inhibit 50-n Input – –50-n 50-n Output Y Y



Time-Delayed Overcurrent Protection (51)Overview of the Function (51)

Time-delayed overcurrent protection is used to provide:

• Short-circuit detection in electric equipment

• Coordinated operation with other devices using current and time-graded settings

Structure of the Function (51)The time-delayed overcurrent protection function element has group-dependent settings. These settings canbe different in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system current using the 3-phase current transformer inputs, for exampleCT1/2/3.The basic time-delayed overcurrent protection function (51) is characterized by the following:

• Current measurement is based on the fundamental current.

• A number of time versus current operate curves are selectable based on IEC and ANSI standards.

• LED operations are provided for each phase. A general pickup and 51‑n output are also provided.

3.3

Functions3.3 Time-Delayed Overcurrent Protection (51)


Logic of the Function (51-n)

[lo_7sr45_TimeDelayedOvercurrentFn, 2, en_US]

Figure 3-2 Logic Diagram of the Time-Delayed Overcurrent Protection (51)

The following characteristic curves are supported by 51-n:

• DTL

• IEC-NI

• IEC-VI

• IEC-EI

• IEC-LTI

• ANSI-MI

• ANSI-VI

• ANSI-EI



Operating time for IEC

Operating time for IEEE/ANSI

Reset time for IEC/IEEE/ANSI

Table 3-1 Constants for Operating-Curve and Reset-Curve Characteristics

Operating Curve Reset CurveCurve Type K α P A B R n

IEC-NI 0.14 0.02 – – – 9.7 2IEC-VI 13.5 1.0 – – – 43.2 2IEC-EI 80 2.0 – – – 58.2 2IEC-LTI 120 1.0 – – – 80 2IEEE/ANSI-MI – – 0.02 0.0515 0.114 4.85 2IEEE/ANSI-VI – – 2.0 19.61 0.491 21.6 2IEEE/ANSI-EI – – 2.0 28.2 0.1217 29.1 2

where,I - Fault-current MagnitudeIS - Pickup settingTm - Time multiplier

Application and Settings NotesGn 51-n ElementDefault setting: DisabledThis setting is used to allow the element to be switched on and off if it is not required. A separate setting isprovided for each element. These settings can be used to select the number of elements required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.

Gn 51-n SettingDefault setting: 1.00 ⋅ Irated

This setting defines the operating current threshold of the element. The applied phase current must exceedthis setting by a factor of 1.10x for pickup of the element. The operation timing then depends on the selectedcharacteristic for the element setting. Once the current is below 1.00x the setting value, the element pickupresets and the reset characteristic is applied. This factor is always applied for 51 elements including when thecharacteristic is selected as DTL. Set this setting to suit your individual application. Gn 51-n CharDefault setting: IEC-NI = IEC normal inverseThis setting defines the characteristic of the inverse curve. Standard ANSI and IEC curves are provided asstandard. The characteristic can also be set as DTL. This increases the number of DTL elements that are avail-



able if more are required. A 51 element can provide a DTL operate and DTL reset characteristic if that isrequired.Set the characteristic to suit your application. Gn 51-n Time Mult (if Gn 51-n Char is set as IEC/ANSI)Default Setting: 1.00This setting defines the time multiplier that is applied to the selected current curve. For IEC curves, this value istraditionally in the range of 0.01 to 10 and for ANSI curves, a value of 0.01 to 10 is typically applied. Gn 51-n Delay (if Gn 51-n Char is set as DTL)Default setting: 5.00 sThis should be set to suit the individual application. If any other characteristic curve is selected, this setting isnot used. Gn 51-n MinOperateDefault setting: 0.00 sWith this parameter, a minimum operate delay time can be selected. The operate delay time of theinverse‑time characteristic curve never falls below the minimum operate delay time.

[dw_7SR45_minimumoperatingtimecurve, 1, en_US]

Figure 3-3 Minimum Operating Time of the Curve

This is traditionally used with recloser systems only and otherwise is recommended to be left at the defaultsetting of 0 s. Gn 51-n FollowerDefault setting: 0.00 sThis setting allows an additional time to be added to that achieved by the selected characteristic curve. It isapplied as a DTL time after the operate state from the curve is achieved. With this setting, the whole curve isshifted linearly on the time axis by this additional definite time.This is traditionally used with recloser systems only and otherwise is recommended to be left at the defaultsetting of 0 s. Gn 51-n ResetDefault setting: 00 s



The reset parameter is used to define whether the element pickup resets to 0 instantaneously when thecurrent falls below the setting or a reset curve characteristic or fixed DTL is applied. This operation is signifi-cant during intermittent faults where an induction disc device would be partially rotated when the faultcurrent is reapplied.Parameter Value DescriptionIEC/ANSI Decay This selection applies a resetting curve to the element pickup to provide

emulation of an induction disc device. The standard IEC curve is applied ifthe operating Char is an IEC Characteristic and the ANSI reset curve isapplied for an ANSI operating Char. Select this setting if the device is coor-dinated with electromechanical devices or other devices which perform adisc emulation reset.

00 s Use this setting for instantaneous reset of the element. When the currentfalls below the setting, the pickup resets completely instantaneously andsubsequent increase in current above the setting restarts the operationdelay from 0.

01 s – 60 s The percentage operated state is retained when the current falls below thesetting for a period of the set delay. A subsequent increase in current toabove the setting within the set delay allows operation to resume from thepartially operated state instead of 0.

Gn 51-n Inrush ActionDefault Setting: OffHigh levels of inrush currents into reactive components, for example transformers; when they are switched incan result in operation of overcurrent elements. The inrush current can be detected by the 81HBL2 element.This parameter can be configured to inhibit the overcurrent element automatically.Parameter Value DescriptionOff The overcurrent element is not affected by operation of the 81HBL2

element.Inhibit The overcurrent element is inhibited by operation of the 81HBL2 element

and automatically released when the 81HBL2 element resets.

Settings ExampleThe 51-n characteristic element provides a number of time/current operate characteristics. The element can bedefined as either an Inverse Definite Minimum Time Lag (IDMTL) or Definite Time Lag (DTL) characteristic. Ifan IDMTL characteristic is required, then IEC and ANSI/IEEE curves are supported. IDMTL characteristics aredefined as inverse because their tripping times are inversely proportional to the fault current being measured.This makes them particularly suitable to grading studies where it is important that only the relay/relays closestto the fault operate. Differentiation can be achieved with minimized operating times. For more details, refer to5.3 Time-Delayed Overcurrent (51/51G/51N) .

Settings Menu


Default Gn1 Gn2Gn Phase O/C Disabled


CONFIGURATION > CURRENT PROT'N > PHASE O/C > 51-nParameter Setting Options Settings

Default Gn1 Gn2Gn 51-n Element Disabled




Gn 51-n Setting 0.1 ⋅ Irated to 2.0 ⋅ Irated

Δ 0.01 ⋅ Irated

1.0 ⋅ Irated – –

Gn 51-n Char DTLIEC-NIIEC-VIIEC-EIIEC-LTIANSI-EIANSI-MIANSI-VI

IEC-NI – –

Gn 51-n Time Mult(Applicable onlywhen Gn 51-n Char isIEC/ANSI)

0.01 to 10.00Δ 0.01

1.00 – –

Gn 51-n Delay (Appli-cable only when Gn51-n Char is DTL)

0.00 s to 15.00 sΔ 0.01 s

5.00 s – –

Gn 51-n MinOperate 0.00 s to 20.00 sΔ 0.01 s

0.00 s – –

Gn 51-n Follower 0.00 s to 20.00 sΔ 0.01 s

0.00 s – –

Gn 51-n Reset IEC/ANSI Decay0 s to 60 sΔ 1 s

0 s – –

Gn 51-n Inrush Action OffInhibit

Off – –

ii NOTEIf the 51-1 function is enabled with a setting value < 0.2 ⋅ Irated then,

• In 1-phase configuration, the device must be Aux powered.

• In 3-phase configuration, the device should have a steady current above 100 mA but lesser than thefault value.

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 51-n Inhibit 51-n Input – –51-n 51-n Output Y Y



Instantaneous Derived Earth Fault Protection (50N) Overview of the Function (50N)

The Instantaneous derived earth fault protection is used to provide:

• Short-circuit detection in electrical equipment

• High-speed protection where appropriate to its location in the power system network and/or networkimpedances

• Backup or emergency protection in addition to other protection functions or devices

• Coordinated operation with other devices using time graded settings

Structure of the Function (50N)The instantaneous earth fault protection function element has group-dependent settings. These settings canbe different in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system earth current by calculating the sum of the 3-phase CT inputs forexample CT1/2/3.The basic instantaneous derived earth fault function (50N) is characterized by the following:


• Elements operate with a Definite Time Lag (DTL) characteristic.

• LED operations are provided for earth fault. A general pickup and 50N-n output are also provided.

Logic of the Function (50N-n)

[lo_7sr45_50N_TimeDelayedDerivedEFFn, 2, en_US]

Application and Settings NotesGn 50N-n ElementDefault setting: Disabled

3.4

Functions3.4 Instantaneous Derived Earth Fault Protection (50N)


This setting is used to allow the element to be switched on and off if it is not required. A separate setting isprovided for each element. This setting can be used to select the number of elements required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.

Gn 50N-n SettingDefault setting: 1.0 ⋅ Irated

This setting defines the operating current threshold of the element. The applied current must exceed thissetting by a factor of 1.00x for pickup of the element. The operation timing then depends on the selecteddelay for the element setting. The element pickup resets when the current is reduced under the followingconditions:



This setting should be set to suit the individual applicationGn 50N-n DelayDefault setting: 0.00 sThis setting is set to suit the individual application.Gn 50N-n Inrush ActionDefault setting: OffHigh levels of inrush currents into reactive components, for example transformers; when they are switched incan result in operation of overcurrent elements. The inrush current can be detected by a high percentage of2nd harmonic current content by the 81HBL2 element. This parameter can be configured to inhibit the over-current element automatically.Parameter Value DescriptionOff The earth fault element is not inhibited by operation of the 81HBL2

element.Inhibit The earth fault element is inhibited by operation of the 81HBL2 element


Settings ExampleThere should be little or no current flowing to earth in a healthy system. So earth fault relays can be given farlower pickup levels than relays which detect excess current above load current in each phase conductor. Earthfault relays are important where the fault path to earth is a high-resistance one (such as in highly arid areas) orwhere the system uses high values of earthing resistor/reactance as any earth fault current that flows in thephase conductors is limited.

Settings Menu


Default Gn1 Gn2Gn Derived E/F Disabled


CONFIGURATION > CURRENT PROT'N > DERIVED E/F > 50N-nParameter Setting Options Settings

Default Gn1 Gn2Gn 50N-n Element Disabled




Gn 50N-n Setting 0.2 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated

1.0 ⋅ Irated – –

Gn 50N-n Delay 0 s to < 20 sΔ 0.01 s

0 s – –

≥ 20 s to < 100 sΔ 0.1 s≥ 100 s to 600 sΔ 1 s

Gn 50N-n InrushAction

OffInhibit

Off – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 50N-n Inhibit 50N-n Input – –50N-n 50N-n Output Y Y



Time-Delayed Derived Earth Fault Protection (51N) Overview of the Function (51N)

The time-delayed earth fault protection is used to provide:

• Detection of earth current in electrical equipment



Structure of the Function (51N)The derived time‑delayed earth fault protection element has group-dependent settings. These settings can bedifferent in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system earth current by calculating the sum of the 3 phase CT inputs forexample CT1/2/3.The basic time‑delayed calculated earth fault function (51N) is characterized by the following:

• Current measurement is based on fundamental current.

• A number of time versus current operate curves are selectable based on IEC and ANSI standards.

• Alternatively, the 51 elements can operate with a definite time lag (DTL) characteristic.

• LED operations are provided for earth fault. A general pickup and 51N‑n output are also provided.

Logic of the Function (51N-n)

[lo_7sr45_51N_TimeDelayedDerivedEFFn, 2, en_US]

Figure 3-4 Logic Diagram of Time-Delayed Derived Earth Fault Protection (51N)

3.5

Functions3.5 Time-Delayed Derived Earth Fault Protection (51N)


The following characteristic curves are supported by 51N-n:

• DTL

• IEC-NI

• IEC-VI

• IEC-EI

• IEC-LTI

• ANSI-MI

• ANSI-VI

• ANSI-EI








Application and Settings NotesGn 51N-n ElementDefault setting: DisabledThis setting is used to allow the element to be switched on and off if it is not required. A separate setting isprovided for each element. These settings can be used to select the number of elements required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.



Gn 51N-n SettingDefault setting: 0.50 ⋅ Irated

This setting defines the operating current threshold of the element. The applied phase current must exceedthis setting by a factor of 1.10x for pickup of the element. The operation timing will then be dependent on theselected characteristic for the element setting. The element pickup will reset when the current is below 1.00xthe setting and the reset characteristic will be applied. This factor is always applied for 51N elements includingwhen the Char is selected as DTL. This setting should be set to suit the individual application. Gn 51N-n CharDefault setting: IEC-NIThis setting defines the characteristic of the inverse curve. Standard ANSI and IEC curves are provided asstandard. The characteristic can also be set as DTL. This increases the number of DTL elements that are avail-able if more are required. 51N elements have a configurable reset characteristic that can be set as DTL. A 51Nelement can provide a DTL operate and DTL reset characteristic if that is required.The characteristic should be set to suit the individual application. Gn 51N-n Time Mult (if Char is set as IEC or ANSI)Default Setting: 1.00This setting defines the time multiplier that is applied to the selected current curve. For IEC curves, this value istraditionally in the range of 0.01 to 10. For ANSI curves, a value of 0.01 to 10 is typically applied. Gn 51N-n Delay (if Char is set as DTL)Default setting: 5.00 sThis is the time delay setting for the element when the Char element is selected as DTL. This should be set tosuit the individual application. This setting is not used if any other characteristic curve is selected. Gn 51N-n MinOperateDefault setting: 0.00 sWith this parameter, a minimum operate delay time can be selected. The operate delay time of the inverse-time characteristic curve never falls below the minimum operate delay time.



This parameter is traditionally used with recloser systems only and otherwise is recommended to be left at thedefault setting of 0 s.



Gn 51N-n Follower DTLDefault setting: 0.00 sThis setting allows an additional time to be added to that achieved by the selected characteristic curve. It isapplied as a DTL time after the operate state from the curve is achieved. With this setting, the whole curve isshifted linearly on the time axis by this additional definite time.This is traditionally used with recloser systems only and otherwise is recommended to be left at the defaultsetting of 0 s.Gn 51N-n ResetDefault setting: 00 sThe reset parameter is used to define whether the element pickup resets to 0 instantaneously when thecurrent falls below the setting or whether a reset curve characteristic or fixed DTL is applied. This operation issignificant during intermittent faults where an induction disc device would be partially rotated when the faultcurrent is re-applied.Parameter Value DescriptionIEC/ANSI Decay This selection applies a resetting curve to the element pickup to provide


00 s Use this setting for an instantaneous reset of the element. When the currentfalls below the setting the pickup will instantaneously reset completely andsubsequent increase in current above setting will restart the operation delayfrom 0.

01 s – 60 s The percentage operated state is retained when the current falls below thesetting for a period of the set delay. Subsequent increase in current toabove setting within the set delay will allow operation to resume from thepartially operated state instead of 0.

Gn 51N-n Inrush ActionDefault Setting: OffHigh levels of inrush currents into reactive components such as transformers when they are switched canresult in operation of overcurrent elements. The inrush current can be detected by a high percentage ofsecond harmonic current content by the 81HBL2 element. This can be configured to inhibit the overcurrentelement automatically by configuration of this setting.Parameter Value DescriptionOff The overcurrent element is not affected by operation of the 81HBL2

element.Inhibit The overcurrent element is inhibited by operation of the 81HBL2 element


Settings ExampleThe 51N-n characteristic element provides a number of time/current operate characteristics. The element canbe defined as either an Inverse Definite Minimum Time Lag (IDMTL) or Definite Time Lag (DTL) characteristic.If an IDMTL characteristic is required, then IEC and ANSI/IEEE curves are supported. IDMTL characteristics aredefined as inverse because their tripping times are inversely proportional to the fault current being measured.This makes them particularly suitable to grading studies where it is important that only the relay(s) closest tothe fault operate. Differentiation can be achieved with minimised operating times. Refer to 5.3 Time-DelayedOvercurrent (51/51G/51N) for more details.



Settings Menu


Default Gn1 Gn2Gn Derived E/F Disabled


CONFIGURATION > CURRENT PROT'N > DERIVED E/F > 51N-nParameter Setting Options Settings

Default Gn1 Gn2Gn 51N-n Element Disabled


Gn 51N-n Setting 0.10 ⋅ Irated to 0.80 ⋅ Irated

Δ 0.01 ⋅ Irated

0.50 ⋅ Irated – –

Gn 51N-n Char IEC-NIDTLANSI-EIANSI-VIANSI-MIIEC-LTIIEC-EIIEC-VI

IEC-NI – –

Gn 51N-n Time Mult(Applicable when Gn51N-n Char is IEC/ANSI)

0.01 to 10.00Δ 0.01

1.00 – –

Gn 51N-n Delay(Applicable when Gn51N-n Char is DTL)

0.00s to 15.00 sΔ 0.01 s

5.00 s – –

Gn 51N-n MinO-perate

0.00 s to 20.00 sΔ 0.01 s

0.00 s – –

Gn 51N-n FollowerDTL

0.00 s to 20.00 sΔ 0.01 s

0.00 s – –

Gn 51N-n Reset IEC/ANSI Decay00 s to 60 sΔ 1 s

00 s – –

Gn 51N-n InrushAction

OffInhibit

Off – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 51N-n Inhibit 51N-n Input – –51N-n 51N-n Output Y Y



Instantaneous Measured Earth Fault Protection (50G) Overview of the Function (50G)

The instantaneous measured earth fault protection is used to provide:

• Short circuit detection in electrical equipment

• High speed protection where appropriate to its location in the power-system network and/or networkimpedances



Structure of the Function (50G)The instantaneous measured earth fault protection function element has group-dependent settings. Thesesettings can be different in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system current using the earth fault CT input for example CT4.The basic instantaneous measured earth fault protection function (50G) is summarized as follows:


• Elements operate with a definite time lag (DTL) characteristic.

• LED operations are provided for earth fault. A general pickup and 50G‑n output are also provided.

Logic of the Function (50G-n)

[lo_7sr45_50G_TimeDelayedMeasuredEFFn, 2, en_US]

Figure 3-6 Logic Diagram of the Instantaneous Measured Earth Fault Protection (50G)

Application and Settings NotesGn 50G-n ElementDefault setting: Disabled

3.6

Functions3.6 Instantaneous Measured Earth Fault Protection (50G)


This setting is used to allow the element to be switched on and off if it is not required. A separate setting isprovided for each element. These settings can be used to select the number of elements required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.

Gn 50G-n SettingDefault setting: 1.0 ⋅ Irated

This setting defines the operating current threshold of the element. The applied current must exceed thissetting by a factor of 1.00x for pickup of the element. The operation timing will then be dependent on theselected delay for the element setting. The element pickup will reset when the current is reduced underfollowing conditions:



This setting should be set to suit the individual application Gn 50G-n DelayDefault setting: 0.0 sThis setting is set to suit the individual application. Gn 50G-n Inrush ActionDefault setting: OffHigh levels of inrush currents into reactive components, for example transformers; when they are switched incan result in operation of overcurrent elements. The inrush current can be detected by a high percentage ofsecond harmonic current content by the 81HBL2 element. This parameter can be configured to inhibit theovercurrent element automatically by configuration of this setting.Parameter Value DescriptionOff The earth fault element is not inhibited by operation of the 81HBL2 elementInhibit The earth fault element is inhibited by operation of the 81HBL2 element and


Settings ExampleThere should be little or no current flowing to earth in a healthy system so earth fault relays can be given farlower pickup levels than relays which detect excess current above load current in each phase conductor. Earthfault relays are important where the fault path to earth is a high-resistance one (such as in highly arid areas) orwhere the system uses high values of earthing resistor/reactance as any earth fault current that flows in thephase conductors will be limited.

Settings Menu


Default Gn1 Gn2Gn Measured E/F Disabled


CONFIGURATION > CURRENT PROT'N > MEASURED E/F > 50G-nParameter Setting Options Settings

Default Gn1 Gn2Gn 50G-n Element Disabled




Gn 50G-n Setting 0.2 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated

1.0 ⋅ Irated – –

Gn 50G-n Delay 0 s to < 20 sΔ 0.01 s

0 s – –

≥ 20 s to < 100 sΔ 0.1 s≥ 100 s to 600 sΔ 1 s

Gn 50G-n InrushAction

OffInhibit

Off – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 50G-n Inhibit 50G-n Input – –50G-n 50G-n Output Y Y



Time-Delayed Measured Earth Fault Protection (51G) Overview of the Function (51G)

The time-delayed measured earth fault protection is used to provide:

• Detection of earth current in electrical equipment



Structure of the Function (51G)The time-delayed measured earth fault protection element has group dependent settings. These settings canbe different in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system current using the earth fault CT input for example CT4.The basic time‑delayed measured earth fault protection function (51G) is summarized as follows:


• A number of time/current operate curves are selectable based on IEC and ANSI standards.

• Alternatively, the 51G elements can operate with a definite time lag (DTL) characteristic.

• LED operations are provided for earth fault. A general pickup and 51G‑n output are also provided.

Logic of the Function (51G-n)

[lo_7sr45_51G_TimeDelayedMeasuredEFFn, 2, en_US]

Figure 3-7 Logic Diagram of Time-Delayed Measured E/F Protection (51G)

The following characteristic curves are supported by 51G-n:

3.7

Functions3.7 Time-Delayed Measured Earth Fault Protection (51G)


• DTL

• IEC-NI

• IEC-VI

• IEC-EI

• IEC-LTI

• ANSI-MI

• ANSI-VI

• ANSI-EI








Application and Settings NotesGn 51G-n ElementDefault setting: DisabledThis setting is used to allow the element to be switched on and off if it is not required. A separate setting isprovided for each element. These settings can be used to select the number of elements required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.

Gn 51G-n Setting



Default setting: 0.5 ⋅ Irated

This setting defines the operating current threshold of the element. The applied phase current must exceedthis setting by a factor of 1.10x for pickup of the element. The operation timing will then be dependent on theselected characteristic for the element setting. The element pickup will reset when the current is below 1.00xthe setting and the reset characteristic will be applied. This factor is always applied for 51G elements includingwhen the Char is selected as DTL. This setting should be set to suit the individual application. Gn 51G-n CharDefault setting: IEC-NIThis setting defines the characteristic of the inverse curve. Standard ANSI and IEC curves are provided asstandard. The characteristic can also be set as DTL. This increases the number of DTL elements that are avail-able if more are required. 51G elements have a configurable reset characteristic that can be set as DTL. A 51Gelement can provide a DTL operate and DTL reset characteristic if that is required.The characteristic should be set to suit the individual application. Gn 51G-n Time Mult (if Char is set as IEC or ANSI)Default Setting: 1.00This setting defines the time multiplier that is applied to the selected current curve. For IEC curves, this value istraditionally in the range of 0.01 to 10. For ANSI curves, a value of 0.01 to 10 is typically applied. Gn 51G-n Delay (if Char is set as DTL)Default setting: 5.00 sThis is the time delay setting for the element when the Char element is selected as DTL. This should be set tosuit the individual application. This setting is not used if any other characteristic curve is selected.The characteristic should be set to suit the individual application. Gn 51G-n MinOperateDefault setting: 0.00 sWith this parameter a minimum operate delay time can be selected. The operate delay time of inversetimecharacteristic curve never falls below the minimum operate delay time.



This is traditionally used with Recloser systems only and otherwise is recommended to be left at the defaultsetting of 0s.



Gn 51G-n Follower DTLDefault setting: 0.00 sThis setting allows an additional time to be added to that achieved by the selected characteristic curve. It isapplied as a DTL time after the operate state from the curve is achieved. With this setting, the whole curve isshifted linearly on the time axis by this additional definite time.This is traditionally used with recloser systems only and otherwise is recommended to be left at the defaultsetting of 0s.Gn 51G-n ResetDefault setting: 0.00 sThe reset parameter is used to define whether the element pickup resets to 0 instantaneously when thecurrent falls below the setting or a reset curve characteristic or fixed DTL is applied. This operation is signifi-cant during intermittent faults where an induction disc device would be partially rotated when the faultcurrent is re-applied.Parameter Value DescriptionIEC/ANSI Decay This selection applies a resetting curve to the element pickup to provide


00 s Use this setting for instantaneous reset of the element. When the currentfalls below the setting, the pickup resets completely instantaneously andsubsequent increase in current above the setting will restart the operationdelay from 0.

01 s – 60 s The percentage operated state is retained when the current falls below thesetting for a period of the set delay. Subsequent increase in current toabove the setting within the set delay allows operation to resume from thepartially operated state instead of 0.

51G-n Inrush ActionDefault Setting: OffHigh levels of inrush currents into reactive components such as transformers when they are switched canresult in operation of overcurrent elements. The Inrush current can be detected by a high percentage ofsecond harmonic current content by the 81HBL2 element. This parameter can be configured to inhibit theearth fault element automatically by configuration of this setting.Parameter Value DescriptionOff The earth fault element is not affected by operation of the 81HBL2 element.Inhibit The earth fault element is inhibited by operation of the 81HBL2 element


Settings ExampleThe 51G-n characteristic element provides a number of time/current operate characteristics. The element canbe defined as either an Inverse Definite Minimum Time Lag (IDMTL) or Definite Time Lag (DTL) characteristic.If an IDMTL characteristic is required, then IEC and ANSI/IEEE curves are supported. IDMTL characteristics aredefined as inverse because their tripping times are inversely proportional to the fault current being measured.This makes them particularly suitable to grading studies where it is important that only the relay(s) closest tothe fault operate. Differentiation can be achieved with minimised operating times. For more details, refer to5.3 Time-Delayed Overcurrent (51/51G/51N) .



Settings Menu


Default Gn1 Gn2Gn Measured E/F Disabled


CONFIGURATION > CURRENT PROT'N > MEASURED E/F > 51G-nParameter Setting Options Settings

Default Gn1 Gn2Gn 51G-n Element Disabled


Gn 51G-n Setting 0.06 ⋅ Irated to 0.80 ⋅ Irated

Δ 0.01 ⋅ Irated

0.50 ⋅ Irated – –

Gn 51G-n Char IEC-NIDTLANSI-EIANSI-VIANSI-MIIEC-LTIIEC-EIIEC-VI

IEC-NI – –

Gn 51G-n Time Mult(Applicable onlywhen Char is IEC/ANSI)

0.01 to 10.00Δ 0.01

1.00 – –

Gn 51G-n Delay(Applicable onlywhen Char is DTL)

0.00 s to 15.00 sΔ 0.01 s

5.00 s – –

Gn 51G-n MinO-perate

0.00 s to 20.00 sΔ 0.01 s

0.00 s – –

Gn 51G-n FollowerDTL

0.00 s to 20.00 sΔ 0.01 s

0.00 s – –

Gn 51G-n Reset IEC/ANSI Decay00 s – 60 sΔ 1 s

00 s – –

Gn 51G-n InrushAction

OffInhibit

Off – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 51G-n Inhibit 51G-n Input – –51G-n 51G-n Output Y Y



Switch onto Fault Protection (50LC/SOTF) Overview of the Function (50LC/SOTF)

The Instantaneous tripping at Switch onto Fault (SOTF) function serves for immediate tripping when switchingonto a fault.

• Detects phase faults in the electrical power system immediately after energization

• Provides additional overcurrent protection at the time of circuit‑breaker closing operation

• Reports that a fault was present during a close operation

• Can be used to prevent repeatedly closing a circuit breaker onto a faluty system

• Can ensure that faults are cleared from the circuit breaker being closed rather than from a remote loca-tion

The SOTF function monitors the phase current for a maximum duration of 25 AC cycles from the CT interruptand trips when any fault is detected as per the user settings. After the 25 AC cycles, the SOTF function isinhibited automatically.

Structure of the Function (50LC/SOTF)The switch onto fault protection element has group‑dependent settings. These settings can be different ineach settings group – group numbers (Gn) 1 and 2.The 50LC/SOTF function monitors the primary system phase currents using the phase CT inputs for exampleCT1/2/3.The 50LC/SOTF element provides additional 3‑phase overcurrent protection that can be set to suit fault detec-tion during energization of a circuit. Typically, this element is set faster than the time‑graded overcurrent andearth fault protection to clear faults when the circuit breaker is closed onto a faulted system.One element is available for this function.

Blocking of the StageThe 50LC/SOTF function can be disabled if it is not required.Each element has an inhibit input that can be operated by a binary input or by an inrush current detected bythe 81HBL2 element.

3.8

Functions3.8 Switch onto Fault Protection (50LC/SOTF)


Logic of the Function (50LC/SOTF)

[lo_7sr45_SwitchOnToFaultFn, 2, en_US]

Figure 3-9 Logic Diagram of Switch onto Fault Protection (50LC/SOTF)

The following graphs show the SOTF operating time for the CT power only.



[dw_7SR45 sensitivity (binary outputs), 3, en_US]

Figure 3-10 Operating Time for Switch onto Fault with Binary Outputs



[dw_7SR45 sensitivity (pulse outputs), 3, en_US]

Figure 3-11 Operating Time for Switch onto Fault with Pulse Output

ii NOTEThe multiphase faults results to a shorter operating time.Under the low battery or battery drained condition, the boot up time is increased by maximum of 25 ms.Operating time will be delayed by 200 ms when both the main battery and RTC battery are drained orremoved.

Application and Settings NotesGn 50LC/SOTFDefault setting: DisabledThis setting is used to allow the element to be switched on and off if it is not required. A separate setting isprovided for each element. This setting can be used to select the number of elements required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.

Gn 50LC SettingDefault setting = 2 ⋅ Irated

The setting of the parameter threshold depends on the respective application.Gn 50LC Inrush ActionDefault setting = OffHigh levels of inrush currents into reactive components, for example transformers; when they are switched incan result in operation of overcurrent elements. The inrush current can be detected by a high percentage of



second harmonic current content by the 81HBL2 element. This parameter can be configured to inhibit theovercurrent element automatically by configuration of this setting.Parameter State DescriptionOff The element is not inhibited by operation of the 81HBL2 elementInhibit The overcurrent element is inhibited by operation of the 81HBL2 element and


Settings Menu


Default Gn1 Gn2Gn 50LC/SOTF Disabled


CONFIGURATION > CURRENT PROTECTION > 50LC/SOTFParameter Setting Options Settings

Default Gn1 Gn2Gn 50LC Setting 1 to 20 ⋅ Irated

Δ 1 ⋅ Irated


Gn 50LC InrushAction

OffInhibit

Off – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 50LC Inhibit 50LC Input – –50LC 50LC Output – –



Thermal Overload Protection (49) Overview of the Function (49)

The thermal overload potection is used to:

• Monitor the real-time thermal levels (θ) of the electrical equipment

• Provide protection from thermal overload by tripping the electrical equipment

ii NOTEThe thermal overload protection function (49) is not available for 7SR450[1/3]-xGA10-1AA0 MLFB variants.

Structure of the Function (49)One thermal element is provided in the 7SR45 Argus Relay.The temperature of the protected equipment is not measured directly. The function measures the thermallevel of the equipment based on hot curve & cold curve characteristics (as described in IEC 60255-149) and bycalculating the maximum RMS values of phase currents. If the RMS current rises above the 49 Overloadsetting for a defined time, then an output signal to trip is given.As per IEC 60255-149, the operating time is a function of the thermal heating time constant 49 TauH andprevious current levels.

[fo_thermal level operate time_deviceManual, 1, en_US]

where t = Time in minutesτ = 49 TauH setting (in minutes)ln = Natural logarithmI = Measured RMS currentIP = Previous steady-state current levelIθ = 49 Overload setting (same as the k ⋅ IB setting mentioned in IEC 60255-149)k = Constant (1.05 predefined)IB = Basic current (same as Irated)

Cold Operating CharacteristicsThe cold operating characteristic comes into effect when the relay has no prefault current and the previousthermal level is 0. Thus, IP = 0 and the time to trip is given as:

[fo_cold_operatetime_devicemanual, 1, en_US]

Hot Operating CharacteristicsThe hot operating characteristic comes into effect when the relay has a steady-state prefault current. Thiscurrent increases the previous thermal level above 0. The time to trip is given as:

[fo_thermal level operate time_deviceManual, 1, en_US]

3.9

Functions3.9 Thermal Overload Protection (49)


Logic of the Function (49)

[lo_7sr45_ThermalOLFn, 2, en_US]

Figure 3-12 Logic Diagram of the Thermal Overload Protection (49)

Application and Settings NotesGn 49 ElementDefault setting: DisabledThis setting is used to allow the element to be switched on and off if it is not required.Parameter State DescriptionDisabled The element is inactive.Enabled The element is active.

Gn 49 SettingDefault setting = 1.0 ⋅ Irated

Setting parameter for 49 Overload function. This parameter is expressed as a multiple of the relay ratedcurrent and is equivalent to the factor (k ⋅ IB) as defined in the IEC 60255-149 thermal operating characteris-tics. It is the value of current above which 100 % of the thermal capacity is reached after a period. Therefore, itis normally set slightly above the full load current of the protected device.



The thermal state may be reset from the fascia or externally via a binary input or through a remote commandfrom a control center. Gn TauHDefault setting = 45.0 mSetting parameter for 49 Heating Time Constant. Used during normal service conditions and overloads of aprotected equipment.

Gn Capacity AlarmDefault setting = DisabledSelection to enable or disable 49 Capacity Alarm.An alarm can be given if the thermal state exceeds a specified percentage of the thermal capacity setting ofthe protected equipment. This can be used to warn the operator that a relay thermal trip will occur if this levelof protected equipment current continues. For the heating curve:

[fo_thermal-state_capacity-alarm, 1, en_US]

where θ = Thermal state at time tI = Measured thermal currentIθ = Setting for 49 Overload function (or k ⋅ IB)The final steady-state thermal condition can be predicted for any steady-state value of input current where t> τ. Gn Capacity Alarm SettingDefault setting = 50 %Setting parameter for 49 Capacity Alarm Setting. Gn Stored Thermal LevelDefault setting = Initial LevelSelection to select which last thermal level should be stored in the memory. If the stored thermal level is:

• Initial Level (θ0), then the relay shall always store θ0 in the memory during trip or power off.

• Previous Level, then the relay shall store the actual thermal level in the memory. If the actual thermallevel θ ≥ 95 %, then θ = 95 % else θ actual shall be stored in the memory.

Gn Initial Thermal LevelDefault setting = 0 %Setting parameter to select the initial thermal level Gn TauCDefault setting = 1.0 ⋅ TauHSetting parameter for 49 Cooling Time Constant. This option shall be visible only in Dual Power variants.The multiple of heating time constant takes into consideration the reduced rate of cooling of a protectedequipment. The function prevents the re-energizing of the electrical equipment until the equipment is cooledbased on the reclose inhibit binary output contact used in the circuit-breaker interlock.



Settings Menu


Default Gn1 Gn2Gn Thermal O/L Disabled


CONFIGURATION > CURRENT PROT'N> THERMAL O/LParameter Setting Options Settings

Default Gn1 Gn2Gn 49 Element Disabled


Gn 49 Setting 0.20 ⋅ Irated to 1.50 ⋅ Irated

Δ 0.01 ⋅ Irated


Gn 49 TauH 1.0 m to 300.0 mΔ 0.5 m

45.0 m – –

Gn Capacity Alarm DisabledEnabled

Disabled – –

Gn Capacity AlarmSetting

50 % to 100 %Δ 1 %

50 % – –

Gn Stored ThermalLevel

Initial LevelPrevious Level

Initial Level – –

Gn Initial ThermalLevel

0 % to 40 %Δ 5%

0 % – –

Gn TauC 11 1.0 ⋅ TauH to 6.0 ⋅ TauHΔ 0.5 ⋅ TauH

1.0 ⋅ TauH – –

Information List

Input/OutputMatrix

User Logic Type IEC 103 Modbus RTU

Inhibit 49 Inhibit 49 Input – –Reset Thermal Level Reset Thermal Level Input Y Y49 Alarm 49 Alarm Output Y Y49 Trip 49 Trip Output Y Y49 Reclose Inhibit11 49 Reclose Inhibit Output Y Y

11 This setting is only available for dual powered 7SR45 Argus Relay variants



2nd Harmonic Block/Inrush Restraint (81HBL2)Overview of the Function (81HBL2)

The inrush-current detection is used to:

• Recognize an inrush process on transformers and other inductive loads

• Generate a blocking signal for protection functions when transformers are switched on

• Allows a sensitive setting of the protection functions

ii NOTEThe 2nd harmonic block/inrush restraint supervision function (81HBL2) is not available for 7SR450[1/3]-xGA10- 1AA0 MLFB variants.

Structure of the Function (81HBL2)The Inrush Detector Supervision function element has group-dependent settings, these settings can bedifferent in each settings group – group numbers (Gn) 1 and 2.The function monitors the primary system current using the 3-phase current transformer inputs, for exampleCT1/2/3.The inrush detector function (81HBL2) is summarized below:

• High speed (instantaneous) operate characteristic

• All phases are inhibited when any phase detects an inrush condition.

Logic of the Function (81HBL2)

[lo_7sr45_HarmonicBlockFeatureFn, 2, en_US]

Figure 3-13 Logic Diagram of the 2nd Harmonic Block/Inrush Restraint (81HBL2)

3.10

Functions3.10 2nd Harmonic Block/Inrush Restraint (81HBL2)


Application and Settings Notes81HBL2 SettingDefault setting: 0.20 ⋅ IPickup ratio (I = I2 / I1)This setting defines the operating threshold of the element. The ratio of the 2nd harmonic component ofcurrent compared to the fundamental component of current is exceeded.This setting should be set to the default value unless in-service experience produces incorrect operation. 81HBL2 Release BlockDefault setting: 1.0 ⋅ Irated

If I1 crosses this setting, inrush block will be released.

Settings Menu


Default Gn1 Gn2Gn Inrush Detector Disabled


CONFIGURATION > SUPERVISION > INRUSH DETECTORParameter Setting Options Settings

Default Gn1 Gn2Gn 81HBL2 Setting 0.10 ⋅ I to 0.50 ⋅ I

Δ 0.05 ⋅ I0.20 ⋅ I – –

81HBL2 Release Block 0.3 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated

1.0 ⋅ Irated – –

Information List

Input/Output Matrix User Logic Type IEC 103 Modbus RTUInhibit 81HBL2 Inhibit 81HBL2 Input – –81HBL2 81HBL2 Output – –

Functions3.10 2nd Harmonic Block/Inrush Restraint (81HBL2)


Technical Data

4.1 General Device Data 784.2 Instantaneous Overcurrent Protection (50) 804.3 Time-Delayed Overcurrent Protection (51) 814.4 Instantaneous Derived Earth Fault Protection (50N) 824.5 Time-Delayed Derived Earth Fault Protection (51N) 834.6 Instantaneous Measured Earth Fault Protection (50G) 844.7 Time-Delayed Measured Earth Fault Protection (51G) 854.8 Switch On To Fault Protection (50LC/SOTF) 864.9 Thermal Overload Protection (49) 874.10 2nd Harmonic Block/Inrush Restraint (81HBL2) 88

4


General Device DataTechnical Data Overview

Product family Non-directional self powered/dual powered overcurrent and earth-fault relay

Case and LEDs Non draw-out polycarbonate case (size 4 standard, non draw-outdesign), 5 non-programmable LEDs & 4 user-programmable LEDs

Measuring inputs (Current) 1 A or 5 A 12

50 Hz/60 HzAuxiliary voltage12 DC 24 V to 60 V

AC 60 V to 240 V/DC 60 V to 240 VCommunication12 Front communication port:

USB (IEC 60870-5-103 or Modbus RTU)Rear communication port:RS485 (IEC 60870-5-103 or Modbus RTU)

Protection functions 50, 50G, 50N, 51, 51G, 51N, 50LC/SOTF, 49Supervision functions 81HBL2Binary input and binary output 4 BI and 4 BO or 2 BI and 2 BO 12

Remote flag 24 V, 0.01 Ws pulse outputLocal flag Mechanical flag indicator 12

• Normal – Green color

• Trip – Red colorPulse output 24 V, 0.1 Ws pulse outputOvervoltage Category IIIPollution degree 2Altitude of operation Maximum up to 2000 m

Sensitivity

Minimum phase current for relay oper-ation

20 % of rated current in 1 phase10 % of rated current in 3 phases

Mechanical Specifications

Design Panel mounting, non draw-out polycarbonate moulded caseEnclosure IP 52 (front side without cover)

IP 54 (front panel with cover)13

IP 40 (enclosure sides)IP 10 (rear side without cover for current terminals)IP 20 (rear side with cover for current terminal)

For operator protection IP 1x for current terminal without coverIP 2x for other terminal and current terminal with cover

Weight14 Approx. 1.97 kg (without front cover)Approx. 2.08 kg (with front cover)

4.1

12 Depending on the ordering option13 Available for height reduced 7SR4503/7SR4504 variants only14 Approximate weight

Technical Data4.1 General Device Data


Installation Category

Installation category (overvoltage cate-gory)

Class III

Pollution

Pollution degree 2

Recommended Terminal Lugs Specifications

Terminal Lugs Type/Cable SpecificationsCurrent inputs TE connectivity PIDG series insulated tin plated crimp ring terminal

Stud size: M3.52.6 mm2 to 6.6 mm2

12 AWGRequired torque: 1.0 Nm

Auxiliary supply Insulated tin plated crimp pin connector2.6 mm2 to 6.6 mm2

12 AWG to 10 AWGRequired torque: 0.5 Nm to 0.6 Nm

Rear communication port Pin type lug/1.5 mm2 control cableRequired torque: 0.5 Nm to 0.6 Nm

Front communication port USB, type BBinary input/binary output/pulseoutput/flag output

Insulated tin plated crimp pin connector2.6 mm2 to 6.6 mm2

12 AWG to 10 AWGRequired torque: 0.5 Nm to 0.6 Nm

Ground terminal Tin plated crimp ring terminalStud size: M34 mm2 to 6 mm2

12 AWG to 10 AWGYellowRequired torque: 0.5 Nm to 0.6 Nm

Technical Data4.1 General Device Data


Instantaneous Overcurrent Protection (50)Operation Non-directionalElements PhaseSetting range Is 0.2 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated

Time delay 0.00 s to < 20.00 s, Δ 0.01 s≥ 20.00 s to < 100.00 s, Δ 0.1 s≥ 100.00 s to 600.00 s, Δ 1 s

Operate level Iop 100 % Is, ± 5 %Reset level > 0.2 . Irated to 0.9 ⋅ Irated setting: ≥ 90 % Iop

> 1 ⋅ Irated to 20 . Irated setting: ≥ 94 % Iop

Basic operate time(with auxiliary power/load current):

2 ⋅ Is: 25 ms, ± 15 ms,5 ⋅ Is 20 ms, ± 15 ms

Operate time delay Tbasic + Td, ± 1 % or ± 30 msInhibited by Binary input or inrush detectorDisengaging time < 50 ms with auxiliary power supply

4.2

Technical Data4.2 Instantaneous Overcurrent Protection (50)


Time-Delayed Overcurrent Protection (51)Operation Non-directionalElements PhaseSetting range Is (51) 0.1 ⋅ Irated to 2.0 ⋅ Irated

Δ 0.01 ⋅ Irated

Time multiplier 0.01 to 10.00Δ 0.01

Time delay (DTL) 0.00 to 15.00 sΔ 0.01 s

Operate level 110 % Is, ± 5 % or ± 2 % ⋅ Irated

Reset level ≥ 90 % Iop

Operate time(with auxiliary power/load current)IECIEEE/ANSI

± 5 % or ± 50 ms 15

DTL td, ± 5 % or ± 40 msFollower delay 0.00 s to 20.00 s

Δ 0.01 sReset IEC/ANSI decaying, 0 s to 60 sInhibited by Binary input or inrush detector

4.3

15 Add current tolerance of ± 5 % or ±2 % ⋅ Irated (whichever is greater) to the operating time tolerance for TMS below 0.1

Technical Data4.3 Time-Delayed Overcurrent Protection (51)


Instantaneous Derived Earth Fault Protection (50N)Operation Non-directionalElements Derived earthSetting range Is 0.2 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated


Operate level Iop 100 % Is, ± 5 %Reset level > 0.2 . Irated to 0.9 ⋅ Irated setting: ≥ 90 % Iop

> 1 ⋅ Irated to 20 . Irated setting: ≥ 94 % Iop


2 ⋅ Is: 25 ms, ± 15 ms,5 ⋅ Is: 20 ms, ± 15 ms


4.4

Technical Data4.4 Instantaneous Derived Earth Fault Protection (50N)


Time-Delayed Derived Earth Fault Protection (51N)Operation Non-directionalElements Derived earthSetting range Is (51N) 0.10 ⋅ Irated to 0.80 ⋅ Irated

Δ 0.01 ⋅ Irated






± 5 % or ± 50 ms 16



4.5

16 Add current tolerance of ± 5 % or ±2 % ⋅ Irated (whichever is greater) to the operating time tolerance for TMS below 0.1 and Is below0.1.

Technical Data4.5 Time-Delayed Derived Earth Fault Protection (51N)


Instantaneous Measured Earth Fault Protection (50G)Operation Non-directionalElements Measured earthSetting range Is 0.2 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated


Operate level Iop 100 % Is, ± 5 %Reset level > 0.2 ⋅ Irated to 0.9 ⋅ Irated setting: ≥ 90 % Iop

> 1 ⋅ Irated to 20 ⋅ Irated setting: ≥ 94 % Iop


2 ⋅ Is: 25 ms, ± 15 ms,5 ⋅ Is: 20 ms, ± 15 ms


4.6

Technical Data4.6 Instantaneous Measured Earth Fault Protection (50G)


Time-Delayed Measured Earth Fault Protection (51G)Operation Non-directionalElements Measured earthSetting range Is (51G) 0.06 ⋅ Irated to 0.80 ⋅ Irated

Δ 0.01 ⋅ Irated






± 5 % or ± 50 ms 17



4.7

17 Add current tolerance of ± 5 % or ±2 % ⋅ Irated (whichever is greater) to the operating time tolerance for TMS below 0.1 and Is below0.1.

Technical Data4.7 Time-Delayed Measured Earth Fault Protection (51G)


Switch On To Fault Protection (50LC/SOTF)Setting range 1 ⋅ Irated to 20 ⋅ Irated

Operate level 100 % Is , ± 5 %Disengaging time < 50 msOperating time < 120 ms for 1.2 ⋅ Irated

< 90 ms for 2 ⋅ Irated

< 75 ms for 5 ⋅ Irated

Inhibited by Binary input or inrush detector

For more information about 50LC/SOTF, refer to 3.8 Switch onto Fault Protection (50LC/SOTF) .

4.8

Technical Data4.8 Switch On To Fault Protection (50LC/SOTF)


Thermal Overload Protection (49)Element Thermal overloadSetting range 0.2 ⋅ Irated to 1.5 ⋅ Irated

Δ 0.1 ⋅ Irated

Heating time constant (TauH) 1.0 min to 300.0 minΔ 0.5 m

Cooling time constant (TauC) 1.0 ⋅ TauH to 6.0 ⋅ TauHΔ 0.5 ⋅ TauH

Capacity alarm 50 % to 100 %Δ 1 %

Initial level 0 % to 40 %Δ 5 %


Overload trip operate time (top)

Operating time tolerance ± 5 % of top or ± 10 sOperating time tolerance Frequency variation(47.5 Hz to 52.5 Hz)(57 Hz to 63 Hz)

± 10 % of top or ± 50 s

Operating time tolerance with Harmonics10 % of 3rd Harmonics25 % of 5th Harmonics15 % of 7th Harmonics

± 15 % of top or ± 50 s

Inhibited by Binary input

4.9

Technical Data4.9 Thermal Overload Protection (49)


2nd Harmonic Block/Inrush Restraint (81HBL2)81HBL2 Inrush Setting(Ratio of 2nd harmonic current to fundamentalcomponent current)

0.10 ⋅ I to 0.50 ⋅ IWhere I = I2/I1

81HBL2 Inrush Release Block 0.3 ⋅ Irated to 20.0 ⋅ Irated

Δ 0.1 ⋅ Irated

tbasic element basic operate time Picks up before operation of any protection elementdue to magnetic inrush

Reset time Operates until drop-off of any protection element dueto magnetic inrush

ii NOTEFor better inrush accuracy, the fundamental current should be minimum of 0.15 ⋅ Irated in at least onephase.

4.10

Technical Data4.10 2nd Harmonic Block/Inrush Restraint (81HBL2)


Applications

5.1 Overview 905.2 Current-Transformer Requirements and Sample Calculations 915.3 Time-Delayed Overcurrent (51/51G/51N) 955.4 Overcurrent Characteristics 975.5 Instantaneous Overcurrent (50/50G/50N) 985.6 Thermal Overload (49) 995.7 Inrush Response 1015.8 Inrush Detector (81HBL2) 102

5


Overview 7SR45 self powered/dual powered relay is a numerical overcurrent and earth-fault protection relay primarilyintended for secondary distribution in electrical networks.The 7SR45 Argus relay is designed to operate with/without an auxiliary supply. The relay is powered primarilyfrom the auxiliary voltage even though all other power sources are available.In the absence of auxiliary voltage, the relay is powered by CT input.The relay offers definite-time and inverse-time overcurrent and ground fault protection functions in accord-ance to IEC and ANSI standards.The 7SR45 relay is targeted for the following applications:

• Protection relay for Ring Main Units (RMU)

• Backup protection relay for the medium-voltage applications

• Protection applications in remote locations where auxiliary supply is not available

• Control and relay panels refurbishment of old electromechanical protection relays

[dw_fct-diagram_7SR45-argus-relay_after49Fn, 1, en_US]

Figure 5-1 Functional Diagram

The relay provides 2 setting groups - Group number (Gn) 1 to 2 which can both be viewed/edited via the fasciaor PC Software tool.18

5.1

18 One setting group is available for the MLFB 7SR450[1/3]-xGA10-1AA0 variant.

Applications5.1 Overview


Current-Transformer Requirements and Sample Calculations

Current-Transformer Requirements

The 7SR45 Argus relay uses the current inputs to energize the relay.Higher ohmic burdens in the current transformer (CT) secondary circuit results in greater saturation of thecore and introduces larger errors in the secondary current waveform. For a given secondary current, it requiresmore voltage from the CT for a higher burden.The total burden on the CT is the vector sum of

• CT winding resistance

• Connecting lead resistance

• Impedance of any auxiliary CTs

• Impedance of the connected relays and metersAfter the ohmic burden is determined, the next step is to predict the CT performance. This is done by deter-mining the required CT excitation voltage or secondary limit voltage. The calculated total ohmic burden ismutiplied by the accuracy limit factor (ALF) and rated secondary current to measure this value.The following expression shows the secondary limiting excitation voltage (EALF):EALF = ALF ⋅ Isr ⋅ (Rct + Rbn)WhereALF – Accuracy limiting factorIsr – Rated secondary current of CT (A)Rct – CT winding resistance (Ω)Rbn – Rated burden of CT (Ω)If the secondary limiting excitation voltage (EALF) calculated exceeds the knee-point voltage of the connectedCT, the CT gets saturated.To select a proper CT, consider the ALF at a given burden. Check the ALF for the entire range of currents therelay is expected to operate.For proper operation of the CT, fulfill the following condition:

[fo_accuracy-limiting-factor_V1, 1, --_--]

So,

[fo_accuracy-limiting-factor_V2, 1, --_--]

WhereIs – Actual secondary current of CT (A)Rb – Actual secondary burden of CT (Ω) (includes burden of the relay (Rrel) and resistance (Rl) of the cablebetween CT and relay.The burden of the 7SR45 relay depends on the input current. The impedance of the relay is inversely propor-tional to the input current. Based on the field conditions, Siemens recommends selecting the primary CT turnsratio that is at least 10 % ⋅ Irated to reduce the dependency of the internal battery.The following graphs show the impedance of the relay for different currents when the relay is poweredthrough a 1-phase current input.

5.2

5.2.1

Applications5.2 Current-Transformer Requirements and Sample Calculations


ii NOTEWhen all the 3 phases are available, the burden on each CT reduces.

[dw_burden-of-relay-for-diff-currents_1A, 1, en_US]

Figure 5-2 Burden of the Relay for Different Currents



[dw_burden-of-relay-for-diff-currents_5A, 1, en_US]

Figure 5-3 Burden of the Relay for Different Currents

Sample CalculationCT ratio: 100/1Rated CT burden (Rbn): 2.5 VA (Rbn = 2.5 Ω for 1 A secondary current)CT winding resistance (Rct): 0.5 ΩRated secondary current (Isr): 1 A

Case 1In the absence/loss of auxiliary power, the minimum phase current required for the relay operation in singlephase = 0.2 Irated (Is = 0.2 A for rated current of 1 A).

[fo_ALF_V3, 1, --_--]

Rb = 28.5 at 0.2 A (Refer to impedance graphs for current > 1 A (rated current, Irated = 1 A))ALF ≥ 1.933



Case 2Fault current = 20 A

[fo_ALF_V4, 1, --_--]

Rb = 0.49 at 20 A (Refer to impedance graphs for current > 1 A (rated current, Irated = 1 A))ALF ≥ 6.6The typical accuracy limit factor is ALF = 10.This calculation is an example. To select an appropriate CT, calculate with the actual parameters.

Recommended CTsConsidering the CTs are connected to the 7SR45 Argus Relay only and the distance between CTs and the7SR45 Argus relay (typically 3 m) is short, use the following CTs:

• 2.5 VA, 5P10 or 5P20 for Irated = 1 A

• 2.5 VA, 5P20 for Irated = 5 A

ii NOTEFor safe operation of the 7SR45 Argus Relay, the maximum power delivered to the relay is 1000 VA for 1 s.Moreover, Siemens does not recommend overloading the relay above 1000 VA for multiple times.

For more information, refer to Thermal Withstand in Electrical Tests under Technical Data chapter in the Hard-ware Manual.



Time-Delayed Overcurrent (51/51G/51N) The 51-n characteristic element provides a number of time/current operate characteristics. The element can bedefined as either an Inverse Definite Minimum Time Lag (IDMTL) or Definite Time Lag (DTL) characteristic. Ifan IDMTL characteristic is required, then IEC, ANSI/IEEE, and a number of manufacturer-specific curves aresupported.The IDMTL characteristics are defined as Inverse because the tripping times are inversely proportional to thefault current being measured. This is suitable for grading studies and important in operating the relay which isclose to the fault. Discrimination can be achieved with minimized operating time.To optimize the grading capability of the relay extra time multiplier, Follower DTL or Minimum operate timesettings can be applied.

[dw_IEC-NI-curve_with_time-muliplier_followe-DTL, 1, en_US]

Figure 5-4 IEC NI Curve with Time Multiplier and Follower DTL Applied

5.3

Applications5.3 Time-Delayed Overcurrent (51/51G/51N)


[dw_IEC-NI-curve_with_min-op-time-setting-appl, 1, en_US]

Figure 5-5 IEC NI Curve with Minimum Operate Time Setting Applied

To increase sensitivity, dedicated ground fault elements are used. There must be a little or no current flowingto earth in a healthy system, so that relays can give far lower pickup levels than relays which detect excesscurrent (> load current) in each phase conductor. Such dedicated earth-fault relays are important where thefault path to ground is a high-impedance (such as in highly arid areas). Such dedicated ground fault relays areimportant where the system uses high values of earthing resistor/reactance and the fault current detected inthe phase conductors is limited.

Applications5.3 Time-Delayed Overcurrent (51/51G/51N)


Overcurrent Characteristics

Selection of Overcurrent Characteristics

Select the characteristic curve shape of the same type as other relays on the same circuit or to grade withitems of plant. For example, fuses or grounding resistors.The following table summarizes the application of IDMTL characteristic.

Table 5-1 Selection of Overcurrent Characteristics

OC/EF Curve Characteristic ApplicationIEC Normal Inverse (NI)IEEE/ANSI Moderately Inverse (MI)

Generally applied

IEC Very Inverse (VI)IEEE/ANSI Very Inverse (VI)

Used with high-impedance paths where there is a significantdifference between the fault levels at protection points

IEC Extreme Inversely (EI)IEEE/ANSI Extremely Inverse (EI)

Grading with fuses

IEC Long Time Inverse (LTI) Used to protect transformer earthing resistors having longwithstand time

Reset Delay

The increasing use of plastic insulated cables both conventionally buried and aerial bundled conductors haveraised the number of flashing intermittent faults on distribution systems. At the fault location, the plasticmelts and temporarily reseals the faulty cable for a short time after which the insulation fails again. The samephenomenon occurs in compound-filled joint boxes or on clashing overhead line conductors. If the reset timeof the relay is longer than the time between successive faults, the repeating occurrence of the fault can causeelectromechanical disc relays to ratchet up and eventually trip the faulty circuit.To mimic an electromechanical relay, the relay can be user-programmed for an IEC/ANSI DECAYING character-istic when an ANSI operate characteristic is applied. Alternatively, a DTL reset (0 s to 60 s) can be used withother operating characteristics.For protection of cable feeders, Siemens recommends using 60 s DTL reset.On overhead line networks, particularly where circuit breaker with automatic reclosing functions are incorpo-rated in the protected system, instantaneous resetting is desirable to ensure that, on multiple-shot reclosingschemes, correct grading between the source relays and the relays associated with the circuit breaker withautomatic reclosing functions are maintained.

[dw_7SR45_reset-delay, 1, en_US]

5.4

5.4.1

5.4.2

Applications5.4 Overcurrent Characteristics


Instantaneous Overcurrent (50/50G/50N) Each instantaneous element has an independent setting for pickup current and a follower definite time lag(DTL) which can be used to provide time grading margins, sequence coordination grading, or scheme logic.The instantaneous description relates to the pickup of the element rather than its operation.

[dw_general-form_of_DTL-operate, 1, en_US]

Figure 5-6 General Form of DTL Operate Characteristic

Instantaneous elements can be used in current graded schemes where there is a significant differencebetween the fault-current levels at different relay points. The instantaneous element is set to pick up at acurrent level above the maximum fault current level at the next downstream relay location, and below its ownminimum fault current level. The protection is set to operate instantaneously and is often termed HighsetOvercurrent. A typical application is the protection of transformer HV connections – the impedance of thetransformer ensuring that the LV side has a much lower level of fault current.The 50-n elements have a low transient overreach that is their accuracy is not appreciably affected by theinitial DC offset transient associated with fault inception.

5.5

Applications5.5 Instantaneous Overcurrent (50/50G/50N)


Thermal Overload (49)Continuous overload current can cause the electrical equipment (cables/transformers) to heat above the ratedtemperature or thermal equilibrium. This would result in damage to the protected equipment. In order toovercome this issue, the electrical equipment must be protected from Thermal Overload.The thermal overload function monitors thermal levels (θ) of the electrical equipment thus tripping them incase of thermal overload. The function prevents re-energizing of electrical equipment until the equipment iscooled.The element uses maximum RMS value of phase currents to estimate the real-time thermal level (θ) of cablesor transformers. The thermal level is based on both past and present current levels, thermal level θ = 100 % formaximum thermal withstand of equipment or the trip threshold.

[dw_7SR45_thermaloverloadheat&coolchar, 1, en_US]

Figure 5-7 Thermal Overload Heating and Cooling Characteristic

Behavior in Case of Power Supply Failure (Aux/CT Power)In case of power supply failure, depending on the selection of the setting, the thermal level stored in thenon‑volatile memory will either be the initial level or the previous level. In the latter case, the thermal replicauses the stored value for calculation and matches it to the operating conditions.Thermal trip followed by power restoredCase 1: Initial level θ = 30 %

[dw_7SR45_thermallevel_initiallevel, 1, en_US]

5.6

Applications5.6 Thermal Overload (49)


Case 2: Previous level

[dw_7SR45_thermallevel_previouslevel, 1, en_US]

ii NOTEThis section is not applicable for 7SR450[1/3]-xGA10-1AA0 variants.

Applications5.6 Thermal Overload (49)


Inrush Response The 7SR45 Argus Relay is designed with immunity against inrush currents (15 % of 2nd harmonic) up to 3 timesthe peak current with fundamental component (50 Hz/60 Hz) inside the currents less than 95 % of Iset.During charging of transformer in the distribution system, the inrush current is generated and the relay doesnot respond to the inrush current up to 3 times the peak value as its not a fault condition.For example, in the waveform shown in the following figure, the inrush currents have been simulated for 3times the peak values of the phase overcurrent setting (51-1: Iset – 0.9 A) and the relay response for the inrushcurrent is monitored. The 2nd harmonic content of the simulated inrush currents is 15 % and the relay funda-mental current component is less than 0.85 A (< 95 % Iset).

[dw_Inrush-currents-wWaveform, 1, en_US]

Figure 5-8 Inrush Currents Waveform

[dw_pickup_and_trip-status-during-inrush, 1, en_US]

Figure 5-9 Pickup and Trip Status during Inrush

In the waveform, the fundamental component of the 50-Hz signal is less than 0.85 A and the peak current istypically 3 times of Iset. The relay in this condition does not initiate the trip signal.

ii NOTEThe inrush response is applicable for 7SR450[1/3]-xGA10-1AA0 variants only.

5.7

Applications5.7 Inrush Response


Inrush Detector (81HBL2) The inrush detector (81HBL2) element detects the presence of high levels of 2nd harmonic current, which indi-cates a transformer inrush current during switch-on. The inrush current raises above the operate level of theovercurrent elements for a short duration. It is important that the relay does not issue an incorrect tripcommand for this transient network condition.If a magnetic inrush condition is detected, then operation of the overcurrent elements can be blocked.The calculation of the magnetizing inrush current level is complex, however a ratio of 20 % of the 2nd

harmonic to the fundamental current meets most applications without compromising the integrity of theovercurrent protection.When the inrush detector (81HBL2) is active, if the fundamental current crosses the 81HBL2 ReleaseBlock setting, then the relay issues the trip command and provides the fault and event records based on theprotection function Is setting and the current magnitudes.

ii NOTEWhen the 50LC Inrush Action is enabled, the 81HBL2 Release Block setting must be greater thanthe 50LC Setting.

ii NOTEThis section is not applicable for 7SR450[1/3]-xGA10-1AA0 variants.

5.8

Applications5.8 Inrush Detector (81HBL2)


Functional Tests

6.1 Commissioning Notes 1046.2 Before Testing 1056.3 Applying Settings 107

6


Commissioning NotesOverview

The commissioning tests are carried out to prove the following:

• The relay is not damaged in transit.

• The relay is correctly connected and installed.

• The characteristics of the protection and settings which are based on calculations.

• Settings are correctly applied.

• Obtain a set of test results for future reference.

6.1

Functional Tests6.1 Commissioning Notes


Before Testing

Safety

ii NOTEThe commissioning and maintenance of the relay should only be carried out by skilled personnel trained inprotective relay maintenance and capable of observing all of the safety precautions and regulations appro-priate to this type of relay and also the associated primary plant.

The following saftey procedures should be followed

• The integrity of any protective conductor connection shall be checked before carrying out any otheractions.

• The relay ratings, operating instructions, and installation instructions must be checked before thecommissioning or maintenance.

• Ensure that all of the test equipment and leads have been correctly maintained and are in good condi-tion.

• Siemens recommends connecting all power supplies of the test equipment via a residual current relay(RCD) which must be located as close to the supply source as possible.

• The selection of test instrument and test leads must be appropriate to the application.

• The selection of an inappropriate range on a multi-range instrument could lead to a dangerous flashover.Therefore, fused instrument leads must be used when measurements of power sources are involved.

• The failure or blowing of an instrument fuse or the operation of an instrument cut-out could cause thesecondary winding of the current transformer (CT) to become open circuit. Therefore,fused test leadsshould not be used where the measurement of a CT secondary current is involved

• Open circuit secondary windings on energized current transformers are a hazard that can produce highvoltages that are dangerous to personnel and damaging to equipment. Thus, test procedures must bedevised as to eliminate this risk.

Sequence of Tests

ii NOTEWhen testing other relays at the same time, coordinate with such testing to avoid danger to personnel andequipment.

• When cabling and wiring are complete, carry out a comprehensive check of all terminations for requiredtorque and compliance with the approved diagrams.

• This is followed by the insulation resistance tests, which if satisfactory allows the wiring to be energizedby either the appropriate supply or test supplies.

• When primary injection tests are completed satisfactorily, all remaining systems can be functionallytested before the primary circuit is energized.

• Some circuits can require further tests before being energized.

• Protection relay testing requires access to the protection-system wiring diagrams, relay configurationinformation, and protection settings.

• The subsequent sequence of tests is based on the arrangement of the relay menu structure.

• A test log is based on the actual tests completed and must be recorded for each relay tested.

6.2

6.2.1

6.2.2

Functional Tests6.2 Before Testing


Test Equipment

The following test equipment is required:

• Secondary injection equipment with integral time interval meter

• Primary injection equipment

• A power source with rated voltage within the working range of the auxiliary-supply rating of the relay.

• A power source with rated voltage within the working range of the binary input rating of the relay.

• Other equipment as appropriate to the protection being commissioned. For more information, refer tothe product-specific documentation.

The secondary injection equipment must be appropriate to the protection functions to be tested. Additionalequipment for general tests and for testing the communications channel is:

• Laptop computer with appropriate interface equipment.

• Printer to operate from the laptop computer (optional).

Use of Laptop Computer to Facilitate Testing

The functions of Reydisp Evolution can be used during the commissioning tests to assist with test proceduresor to provide documentation for recording the test and test parameters. One method is to clear the eventrecords before each test is started, after the test upload from the relay, the settings, events file generated as aresult of application of the test. These files can be saved to retain a comprehensive record of that test.You can prepare the relay settings on the laptop computer (offline) or on the relay before the test. Thesesettings should be saved for reference and compared with the settings at the end of testing. This enableschecking of errors that are not introduced during testing and any temporary changes to settings to suit thetest process are returned to the required service state.A copy of the relay settings as a Rich Text Format (.rtf) file suitable for printing or for record purposes can beproduced from Reydisp Evolution as follows:

• From the File menu, select Save As.

• Change the File type to Export Default/ Actual Setting (.RTF) and enter a suitable file name.When testing is completed, the event records must be cleared and the settings file checked to ensure that therequired in-service settings are being applied.

6.2.3

6.2.4

Functional Tests6.2 Before Testing


Applying SettingsThe relay settings for the particular application must be applied before any secondary testing occurs. If relaysettings are not available, then the relay with default settings can be used for precommissioning tests.Note that the tripping and alarm contacts for any function must be programmed correctly before any schemetests are carried out.The relay features multiple settings groups. Only one of the settings groups is active at a time. In the applica-tions where more than one settings group is to be used, it can be necessary to test the relay in more than oneconfiguration.When using the settings groups, it is not important for the relay to operate in the settings apart from thecurrent display mode. The relay operates in the Active Settings Group and the visible edit/view settings groupcan be altered. This allows the settings in one group to be altered from the relay fascia while the protectioncontinues to operate on a different unaffected group. The Active Settings Group and the Edit Settings Groupare selected in the Menu.If the relay is allowed to trip during testing, the instruments display is interrupted and replaced by the TripAlert screen which displays the fault-data information.After applying a settings change to the relay, which may involve a change to the indication and outputcontacts, press the TEST/RESET key to ensure that any existing indication and output is correctly cleared.

6.3

Functional Tests6.3 Applying Settings



Appendix

A.1 Connection Examples for RMU Application 110A.2 Connection Examples for Distribution Transformer Application 112A.3 Connection Examples for Phase and CBCT Measurement 114A.4 Connection Examples for Earth-Fault Application 115A.5 Revision History 116

A


Connection Examples for RMU ApplicationFigure A-1 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections aretypical and measure the phase current of the primary CT only.

[dw_argus-relay_RMU-application, 2, en_US]

Figure A-1 7SR45 Argus Relay for RMU Application

The application shows the use of 50/51/50N/51N/50LC/49 protection functions. The remote trip via communi-cation (through BO with auxiliary input present) and binary input is possible.

[dw_self-powered-relay_RMU-application, 2, en_US]

Figure A-2 7SR45 Self Powered Relay for RMU Application

A.1

AppendixA.1 Connection Examples for RMU Application


The application shows the use of 50/51/50N/51N/50LC/50G/51G/49 protection functions. The remote trip viacommunication (through BO with auxiliary input present) and binary input is possible.

AppendixA.1 Connection Examples for RMU Application


Connection Examples for Distribution Transformer ApplicationFigure A-3 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections aretypical and measure the phase current and ground current of the primary CT only.

[dw_self-powered-relay_distribution_transf-appl, 2, en_US]

Figure A-3 7SR45 Self Powered Relay for Distribution Transformer Application

The application shows the use of 50/51/50N/51N/50LC/50G/51G/49 protection functions. The remote trip viabinary input is possible.

A.2

AppendixA.2 Connection Examples for Distribution Transformer Application


[dw_argus-relay_distribution_transf-appl, 2, en_US]

Figure A-4 7SR45 Argus Relay for Distribution Transformer Application

The application shows the use of 50/51/50N/51N/50LC/50G/51G/49 protection functions. The remote trip viabinary input is possible.

AppendixA.2 Connection Examples for Distribution Transformer Application


Connection Examples for Phase and CBCT MeasurementFigure A-5 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections aretypical and measures the phase current and ground current of the primary CT only.

[dw_argus-relay_with_phs-CBCT-measurement-appl, 2, en_US]

Figure A-5 7SR45 Argus Relay with Phase and CBCT Measurement Application

The application shows the use of 50/51/50N/51N/50LC/50G/51G/49 protection functions. The remote trip viacommunication (through BO with auxiliary input present) and binary input is possible.

A.3

AppendixA.3 Connection Examples for Phase and CBCT Measurement


Connection Examples for Earth-Fault ApplicationFigure A-6 shows CT circuits connected to 1 A or 5 A of 7SR45 Argus relay. The CT and ground connections aretypical and measure the ground current of the primary CT only.The application shows the use of 50G/51G protection functions. The remote trip via communication (throughBO with auxiliary input present) and binary input is possible.

[dw_argus-relay_with_erath-fault-appl, 2, en_US]

Figure A-6 7SR45 Argus Relay with Earth-Fault Application

A.4

AppendixA.4 Connection Examples for Earth-Fault Application


Revision HistorySoftware Revision History

2020/09 2438H80001R2f-1b Software maintenance2020/08 2438H80001R2f-1a • Protection function 51-1 setting range change to 0.1 ⋅ Irated to

2.0 ⋅ Irated

• User-Programmable LED feature added2020/05 2438H80001R2e-1b Software maintenance2019/12 2438H80001R2e-1a Thermal overload protection function (49) added2019/05 2438H80001R2c-1b Software maintenance to suit customer requirements2018/11 2438H80001R2c-1a Supervision function (81HBL2) added2018/06 2438H80001R1f-1a Third Release2018/06 2438H80001R2b-1b Third Release2018/04 2438H80001R2a-1a Second Release2017/08 2438H80001R1e-1a Software maintenance to suit customer requirements2017/01 2438H80001R1d-1a • Protection function 50, 50N, 50G setting range change to

0.2 ⋅ Irated to 20 ⋅ Irated in step of 0.1 ⋅ Irated

• Protection function 50, 50N, 50G reset ratio changed to 90 %for setting below 1 ⋅ Irated and 94 % for setting above 1 ⋅ Irated

2016/10 2438H80001R1c-1a Software maintenance to suit customer requirements2016/09 2438H80001R1b-1a • Faster response times on 1 phase (t + 100 ms max) in 0.2 to

0.3 ranges.• IRF functionality.

2015/08 2438H80001R1a-1a First Release

Hardware Revision History

2020/09 7SR450/GG Fourth Release (with conformal coating PCBA)2018/06 7SR450/FF Third Release (with reduced front cover and housing height)2018/04 7SR450/EE Second Release (with Aux. Power supply, remote flag and local

flag, RS 485, additional AC/DC BIs and BOs)2017/02 7SR450/DD Hardware maintenance2016/09 7SR450/CC Circuit changes to improve signal conditioning2015/08 7SR450/BB First Release

A.5

AppendixA.5 Revision History


Index

1,2,3 ...

2nd harmonic block/inrush restraint (81HBL2) 75

A

Auxiliary power 20

B

Battery profile 20Binary inputs 26Binary output configuration 28Binary output operations 30Binary outputs 28BO trip 30

C

Current-transformer requirements 91

D

Data storage 36

E

Event records (Event log) 36

F

Fault records (Trip log) 36Front Fascia 18Front fascia keypad 20Front fascia with flag output 18Front fascia without flag output 19Functional block diagram 90

G

General alarms 20General Properties 13

I

Inrush detector (81HBL2) 102Inrush response 101Installation category 79Instantaneous Derived Earth Fault Protection (50N) 50Instantaneous measured earth fault protection (50G) 58Instantaneous overcurrent (50/50G/50N) 98Instantaneous overcurrent protection (50) 41

L

LED functions 21LED indication 21Light Emitting Diode (LED) 21Liquid crystal display 19Local Flag 23Low battery LED 22

M

Mechanical specifications 78

P

Pollution 79Protection healthy LED 21Pulse output 31

R

Real time clock 37Relay Information 24


Remote flag output 32Reset delay 97Reset LED 33Reset on battery 30Reset on CT input or auxiliary voltage 30RMU applications 110

S

Selection of overcurrent characteristics 97Sensitivity 78Switch onto fault protection (50LC) 66

T

Terminal lugs specifications 79Thermal Overload (49) 99Thermal overload protection (49) 71Time delayed overcurrent (51/51G/51N) 95Time-delayed derived earth fault protection (51N) 53Time-delayed measured earth fault protection (51G) 61Time-delayed overcurrent protection (51) 44Trip flag indication 33Trip ready and pickup 21Trip ready LED 22

Index


Documents

7SR45 Device Manual - files.realpars.com