SLR140 - AR

SLR140 USER MANUAL

U S E R M A N U A L OVER CURRENT AND EARTH FAULT &REF RELAY

WITH AUTORECLOSER

SLR140

Stelmec Limited | Over Current and Earth Fault Relay 1STELMEC LIMITED

USER MANUAL SLR140

PREFACE

The aim of this handbook is to provide to the user information useful for the operation of SLR140 relay with the local MMI.

We advise you to read it carefully, in order to take note of the available functionalities and to proceed to connection and power of the product in accordance with the provided recommendations.

Locally settings, commissioning and real time or event readings are accessible from keyboard and displayed on the protection display.

To be fully exploited, the available functions must be parameterized and consulted with the settings

Software PC-Protection, provided with the product.

Before any use, we recommend you to read the safety instructions of this User’s guide.

Stelmec Limited | Over Current and Earth Fault Relay 2

USER MANUAL SLR140

Table of Contents Page no 1. General 5 1.1. Safety Instructions 6 1.2. Relay Features 7 1.3. Preliminary Information 8 2. Introduction 9 2.1. Application 9 2.2. Main Features 9 3. User Interface 10 3.1. General 10 3.2. Local Panel 10

3.2.1. Display 10 3.2.2. Keypad 10 3.2.3. Indicators 11 3.2.4. RS232 Serial Communication 12

4. Local Panel Operation 13 4.1. Functional Menu Chart 13

4.1.1. Individual Menu Chart 14 4.1.2. Fault Log Settings 14 4.1.3. IL Settings 15 4.1.4. Io Settings 16 4.1.5. Digital Input Settings 16 4.1.6. Digital OP Settings 17 4.1.7. Force OP Settings 21 4.1.8. Enable Stages 22 4.1.9. Scalling Settings 22 4.1.10. System Settings 23

4.2. Description of Functional Menu 23 5. Functions 24 5.1. Principles of the Numerical Protection Techniques 24 5.2. Relay Protection Functions 25

5.2.1 Non-Directional over Current Protection (50/51) 25 5.2.2 Non-Directional Earth Fault Protection (50N/51N) 26 5.2.3 Circuit Breaker Failure Protection CBFP (50BF) 29 5.2.4. Self Supervision 30 5.2.5. Trip Circuit Supervision (95ABC). 31 5.2.6. Features 31 5.2.7. Auto – Recloser 32 5.2.8. Basic Requirements 32 5.2.9. Restricted Earth Fault Protection(64N). 33


USER MANUAL SLR140


Table of Contents Page no 6. Configuration and Parameters Settings 34 6.1. Measured Values 34 6.2. Principle of Parameter Settings 35 6.3. Enabling and Disabling Protection Functions 37 7. Communication 38 7.1. Mod Bus RS485 Communication 38 8. Output Response Curves 39 8.1. Low Set Characteristics Curves 39

8.1.1. Normal Inverse Curve 39 8.1.2. Very Inverse Curve 39 8.1.3. Extremely Inverse Curve 40 8.1.4. Long Time Inverse Curve 40 8.1.5. ‘1.3S’ Curve 41 8.1.6. ‘3S’ Curve 41 8.2. High Set Characteristics Curve 41

9. Application Circuit for 3O/C and 1E/F 42 10. Protection Stages 43 10.1. Over Current Protection Stages 43 10.2. Earth Fault Current Protection Stages 43 10.3. Auto - Reclose Protection 44 11. Technical Data 44 11.1. Auxiliary Supply 44 11.2. Current Inputs 44 11.3. Trip Contacts (T1&T2) 45 11.4. Accuracy 45 12. Construction 46 12.1. Mechanical 46 12.2. Dimensional Drawing 46 12.3. Panel Mounting 47 12.4. Semi-Flush Mounting 47 13. Commissioning 48 14. Ordering Information 49 15. Contact Information 50

USER MANUAL SLR140

1. General

This part of the manual describes the general function of the combined over current and earth fault relay SLR140 includes relay operational instructions. It also includes instructions on parameterization and configuration of the relay and instructions on changing of settings. And includes detail protection function descriptions, technical data sheets and case mounting.


USER MANUAL SLR140

1.1. Safety Instructions For your safety, we recommend you to read the following information/instruction carefully before handling. They have the aim of specifying the precautions essential to the good installation and the perfect operation of the relay.

Connection of SLR140 relay On load withdrawal Removal and destructions

The terminals on the rear panel of the relay may carry dangerous voltages. Although the auxiliary voltage is switched off. A live current transformer secondary circuit must not be opened. Disconnecting a live circuit may cause dangerous voltages! Any operational measure must be carried out according to national local handling directives and instructions.


USER MANUAL SLR140


1.2. Relay Features

The combined over current and earth fault relay SLR140 is a non - directional current measuring protection relay for over current, short circuit and earth

fault Protection.

Protection features are following

Three over current stages (I> && I>>) One earth fault stage(Io> && Io>>) Circuit breaker failure protection (CBFP). Phase high set instantaneous or definite time over current stage. Non directional definite time or inverse time (IDMT) earth fault stage. Numerical display for setting values, measured values, recorded fault

values, indications etc. Built-in pulse-width-modulated galvanically isolating power unit for a

wide range of auxiliary supply.

Continuous self-supervision of relay hardware and software for enhanced system reliability and Availability.

Auto-diagnostic fault indication to facilitate repair of a permanent internal relay fault.

RS232 communication port for PC connections. SCADA Port Communication for RS-485 Connections.

USER MANUAL SLR140

1.3. Preliminary Information

In the SLR140 Relay, technology used in digital. Due to their design, they comprise a significant number of self controls, as well as powering as under operation, any material or software failure is automatically detected and announced by an alarm. During the first use, it is does not necessary to test all the functions. It is on the other hand recommended to look after and check the good wiring of the relay, and the specifications of this handbook have the aim of allowing a fast setting in order of the relay. The user will be able then to define the setting value necessary to his installation, and to adjust the relay using the setting software, common to the whole of the range. The saving of the configuration and its loading will be carried out with a laptop. The functions of recording of events and fault recording, available through the Setting software, will also largely contribute to the setting in the order of the Installation.


USER MANUAL SLR140


2. Introduction

This part of the manual describes few applications, main features, protection functions and contains technical data and also includes operating instructions. 2.1. Application

The versatile basic protection functions the wide variety of additional functions and several available communication protocols render the over current and earth fault relay (SLR140) ideal Protection relay power plants and substations as well as for industry applications. The modern technology in association with an extensive self supervision and a reliable Construction ensures an extremely high availability for the SLR140 protection relay. The relay is used for over current and earth fault protection. The relay can also be used in other applications where a single, two or three protection relay is needed. 2.2. Main Features

Fully digital signal handling with a powerful 8-bit micro controller high measuring Accuracy on all setting ranges due to accurate 12-bit A/D conversion technique.

Easy enabling and disabling of protection functions according to the needs of the Intended application.

Wide setting ranges for the protection functions. Easy adaptation of the relay to various substations and alarm systems due

to a flexible signal-grouping matrix in the relay. Recording of events and last 16 fault values into an event register, from

which data can be read via the keypad and the display or by means of the PC based SLR140 user interface.

Built-in fault recorder for evaluating secondary, as well as Over current and Neutral currents of the protective object.

Auto – Reclose Function.

USER MANUAL SLR140

3. User Interface 3.1. General

The SLR140 relay can be controlled in two ways:

Locally with the push buttons on the relay front panel. Locally with a PC connected to the serial port on the relay front panel.

3.2. Local Panel Figure below show the location of the components of the local user interface on the front panel of the relay.

LCD display Keypad LED Indicators RS232 serial communication port for a PC.

3.2.1. Display

The SLR140 relay provided with clear characteristics 16x2 lines LCD display.

3.2.2. Keypad Use the keypad and the display to navigate through the menus and to set the required parameters/values. The keypad comprises the following keys.

Left, Right, Up, Down And Reset Keys.


USER MANUAL SLR140

Up/Down arrow keys are to select functions Increasing/Decreasing. Left arrow key for cancellation the selected function. Right arrow key for confirm the function. Reset Key used for Reset functions.

3.2.3. Indicators

The relay front panel holds 9 LED indicators.

Figure 3.2 Relay front panel.

Operation Indicators

LED Indicators Explanation Measure/Remarks

AUX LED Lit The Auxiliary Power Switched ON Normal Operating State

ERROR LED Lit An Internal Relay Fault has been Detected The relay attempts to reboot. If the error LED remains lit, call for maintenance.

START LED Lit One or several signals of the output relay matrix have been assigned to output alarm and the output has been activated by one of the signals.

The LED is switched off, when the signal that caused output alarm to activate, e.g. The START signal resets. The resetting depends on the type of configuration. Connected or Latched.

TRIP LED Lit One or several signals of the output relay matrix have been assigned to output Trip and the output has been activated by one of the signals.

The LED is switched off, when the signal that caused output Trip to activate, e.g. The TRIP signal resets. The resetting depends on the type of configuration. Connected or Latched.

L1 Trip and the output has been activated by line 1 low set (or) high set over current.

L1 LED is glowing; When the Trip is activating by line 1 over current.


USER MANUAL SLR140

L2 Trip and the output has been activated by line 2 low set (or) high set over current.


L3 Trip and the output have been activated by line 3 low set (or) high set over current.


L0 Trip and the output have been activated by low set (or) high set earth fault current.

L0 LED is glowing; When the Trip is activating by earth fault current.

BAT Battery ON/OFF indication (Optional) Battery using time glowing.

3.2.4. RS232 Serial Communication To connect with PC, a RS 232 serial port is available on the front panel of the relay. The pin layout is as follows.

RS-232 Specifications

RS-232 is a complete standard. This means that the standard sets out to ensure Compatibility between the host and peripheral systems by specifying:

Common voltage and signal levels Common pin-wiring configurations A minimal amount of control information between the host and peripheral

systems.

Unlike many standards which simply specify the electrical characteristics of a given interface, RS-232 specifies electrical, functional, and mechanical characteristics to meet the above three criteria.


USER MANUAL SLR140

.

4. Local Panel Operation The local panel can be used to read measured values, set parameters and configure relay functions. However, please note that some of the parameters can only be set by means of a PC connected to the local communication port.

4.1. Functional Menu Chart

Following figure shows the functional menu for SLR140 relay


USER MANUAL SLR140

4.1.1. Individual Menu Chart

4.1.2. Fault Log Settings


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4.1.3. IL settings


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4.1.4. Io Settings


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4.1.5. Digital Input Setting

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4.1.6. Digital OP Set


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4.1.7. Force OP Setting

4.1.8. Enable Stages


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4.1.9. Scalling Settings

4.1.10. System Settings


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4. 2. Description of Functional Menu

The general menu structure is shown in above figure. The menu is based on the user’s configuration and the options are according to the order code. For example only the enabled protection stages will appear in the menu. 5. Functions


USER MANUAL SLR140

The individual protection function of the SLR140 Over current and Earth Fault Relay can independently of each Other be enabled or disabled according to the requirements of the application. 5.1. Principle of the Numerical Protection Technique

The SLR140 relay is designed using numerical technology. This means that all signal filtering, protection and control functions are made by digital processing.

The numerical technology used in the relay is primarily based on an adapted fast Fourier (FFT) analysis, in which case the no of calculations (multiplications & additions) required to filter the measuring quantity remains reasonable.

By using synchronized sampling of the measured signal (phase or earth fault current) and a sample rate according to the 2n series, the FFT technique leads to a

solution, which can be realized with just a 8 bit microcontroller without using a separate DSP (Digital Signal Processor)

The synchronized sampling means an even number of 2n samples per

period, e.g.16 samples/period. This means that the frequency must be measured and the no of samples per period must be controlled accordingly, so that the no of samples per period remains constant should the frequency change.

Figure shows the main component of the relay using numerical technology,


USER MANUAL SLR140


i.e. the relay comprises input current transformers, digital input adapters output relays, A/D converters and microcontroller including memory circuits. Further the relays needs a power supply and a user interface

5.2. Relay Protection Functions The relay having the following protection functions:

Three phase over current protection, with 50/51(3I>, 3I>>) thresholds. Earth fault over current protection, with 50N/51N (1Io>, 1Io>>) thresholds. 50BF circuit breaker failure protection(CBFP) functions by checking of the

disappearance of the phases and earth fault currents. Available operation functions:

Measurement of the average, instantaneous or maximum currents, phases and earth fault current.

Control of the operation of the circuit breaker by monitoring of the closings and trips.

Logical selectivity functions available on the phase and earth fault Threshold.

Internal relay NO/NC selectivity function. The relay controlling following two reset function.

Hand reset. Self reset.

5.2.1. Non-Directional Over Current Protection I>, I>> (50/51)

The three phase over current unit comprises adjustable over current stages, i.e. I>,I>>

Stage I> can be configured for definite time or inverse time operation characteristic.

Stage I>> have definite time characteristic. Figure 5.2.1 shows the fundamental block diagram of stage I>.

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Parameters of the Over Current Stages I>, I>> (50/51)

Parameter: Value/unit:

Measured value IL A Max. Value of phase currents L1, L2, L3 secondary values.

I>,I>> A Setting value in primary current units I>,I>> In Setting value as per unit value. setting done in x In

NI,VI,EI,LTI,3S,1.3S Operation character/inverse time(I>) curve

DT Operation character/definite time(I>) t> S Operation time at IDMT(I>) t>> S Operation time at Definite time (I>>)

IL Setting

k Time multiplier at inverse time(I>)

When the over current exceeds the low-set I> setting value, the over current

low-set element starts and delivers a start signal to the display panel and a group of pre assigned relay outputs. After a delay time, determined by the inverse time current characteristics curve selected and the measured current, this over current element operates and delivers trip signal to the display panel and a group of relay outputs that are configured to link to the low-set over current tripping.

When the over current exceeds the high-set I>> setting value, the over current high-set element starts and delivers a start signal to the display panel and a group of pre assigned relay outputs. After a preset time determined by t>>, this over current element operates and a group of relay outputs that are configured to link to high-set over current tripping.

The low set stage (I>, Io>) of the over current unit can be confirmed for inverse current characteristics. Six sets of characteristics curves according to IEC


USER MANUAL SLR140

60255-3 are available for the low set stage. I.e. Normal inverse (NI), Very inverse (VI), Extremely inverse (EI) , Long time inverse (LTI), 3S Curve and 1.3S Curve. 5.2.2. Non-Directional Earth Fault Protection (50N/51N)

One earth fault current unit comprises adjustable earth fault current stages, i.e. I>,I>>

Stage Io> can be configured for definite time or inverse time operation characteristic.

Stage Io>> have definite time characteristic. Figure shows the fundamental block diagram of stage Io>.

Parameters of the Earth Fault Stages I>, I>> (50/51)

Parameter: Value/unit:

Measured value Io A Max. Value of phase currents Lo secondary values.

Io>,Io>> A Setting value in primary current units Io>,Io>> In Setting value as per unit value. setting done in x In

NI,VI,EI,LTI,3S,1.3S

Operation character/inverse time(Io>) curve

DT Operation character/definite time(Io>) to> S Operation time at IDMT(Io>) to>> S Operation time at Definite time (Io>>)

Io Setting

k Time multiplier at inverse time(Io>)

When the earth fault current exceeds the low-set Io> setting value, the earth fault low-set element starts and delivers a start signal to the display panel and a group of pre assigned relay outputs. After a delay time,


USER MANUAL SLR140

determined by the inverse time current characteristics curve selected and the measured current, this earth-fault element operates and delivers trip signal to the display panel and a group of relay outputs that are configured to link to the low-set earth-fault tripping.

When the earth fault current exceeds the high-set Io>> setting value, the earth fault High-set element starts and delivers a start signal to the display panel and a group of pre assigned relay outputs. After a preset time determined by to>>, this earth fault element operates and a group of relay outputs that are configured to link to high-set earth fault tripping.

5.2.3. Circuit Breaker Failure Protection (50BF)

The operation of the circuit breaker failure protection is based on the supervision of the operating time, from the pick up of the configured trip relay to the dropout of the same relay.

If that time is longer than the operating time of the CBFP stage, the CBFP

stage activates another output relay, which will remain activated, until the primary trip relay resets.

The CBFP stage functions also in earth fault situations, because its function

is merely based on supervision of the function of the output relay T1.

The CBFP blocking signal prevents the CBFP stage from operating, when the


USER MANUAL SLR140


output relays or any other protection function is operated by forced control.

This protection feature allows the relay to trip the upstream circuit breaker when a local breaker failure condition is detected.

5.2.4. Self Supervision

The functions of the micro controller and the associated circuitry as well as the program execution is supervised by means of a separate watchdog circuit. Besides supervising the relay the watchdog circuit attempts to restart the micro controller in a fault situation. If the restarting fails, the watchdog issues a self-supervision alarm because of a permanent relay fault.

When the watchdog circuit detects a permanent fault it always blocks any

control of the other output relays, except for the self- supervision output

relay.

Also the internal supply voltage is supervised. Should the auxiliary supply of

the relay disappear, an IF alarm is automatically given. The IF relay contact

is normally closed type of contact. This means that the IF relay contact is

closed, when there is an internal fault or there is no auxiliary power

supply.

If the relay is fully operational with the auxiliary power supply, the IF

contact is on the open position.

Example:- IL Setting: I>0.20xIn

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In 1>0.20xIn

secondary current [5A] Set value of load current

Curve NI Selection of delay characteristics [NI,VI,EI,LTI,3.0S, 1.3S,DMT]

t> 0.10s Selection of delay time

5.2.5. Trip Circuit Supervision (95ABC)

Trip circuit supervision is a critical function in a protection scheme. Continuously monitors the status of circuit breaker trip circuits to detect:

Wiring damage

Loose terminal screws

Poorly crimped terminal wiring

CB coil open circuit�CB pallet switch misaligned

Trip circuit supply failure (Blown fuse)

5.2.6. Features

Continuous monitoring of circuit-breaker trip circuits and other essential control circuits

Preset operate time preventing unwanted alarm signals at circuit-breaker operation

Indication of relay operation with LED indicator on the front panel and output relay

Detects bad contact, contact welding and auxiliary voltage failures in the supervised circuit

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Block Diagram

5.2.7. Auto-Recloser

Introduction In electric power distribution, an autorecloser is a circuit breaker equipped with a mechanism that can automatically close the breaker after it has been opened due to a fault

Autoreclosers are used in coordinated protection schemes for overhead line power distribution circuits. These circuits are prone to transitory faults such as nearby lightning strikes, wind-borne debris, animals climbing the insulators, and the like. With a conventional circuit breaker or fuse, a transient fault would open the breaker or blow the fuse, disabling the line until a technician could manually close the circuit breaker or replace the blown fuse. But an autorecloser will make several pre-programmed attempts to re-energize the line. If the transient fault has cleared, the autorecloser's circuit breaker will remain closed and normal operation of the power line will resume. If the fault is some sort of a permanent fault (downed wires, tree branches lying on the wires, etc.) the autorecloser will exhaust its pre-programmed attempts to re-energize the line and remain tripped off until manually commanded to try again. 90% of faults on overhead power lines are transient and can be cured by autoreclosing. [3] The result is increased availability of supply.

5.2.8. Basic Requirements


http://en.wikipedia.org/wiki/Electric_power_distribution

http://en.wikipedia.org/wiki/Circuit_breaker

http://en.wikipedia.org/wiki/Fault_(technology)

http://en.wikipedia.org/wiki/Power_distribution

http://en.wikipedia.org/wiki/Lightning

http://en.wikipedia.org/wiki/Electrical_insulation

http://en.wikipedia.org/wiki/Fuse_(electrical)

http://en.wikipedia.org/wiki/Autorecloser#cite_note-2

http://en.wikipedia.org/wiki/Availability

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The Auto-recloser relay should reclose the breakers whenever it is initiated by

protective relay.

The Auto-recloser relay shouldn’t reclose the breakers if the initiation occurs

during the reclaim time.

For single pole mode, the AR-Relay should only reclose the Breakers for single

phase to earth fault.

The AR-Relay should never reclose the breakers if,

No initiation from protective relay e.g. when the breakers are intentionally

opened by people.

Any of the Breakers is not ready, its not switched to active.

5.2.9. Restricted Earth – Fault Protection (67N)

The restricted earth-fault protection is designed to detect high-resistance earth faults within the protection zone of power transformers.

Restricted earth-fault protection – as well as transformer differential protection – is based on the principle of comparison of measured variables by comparing the residual current of the phase current transformers of the given winding with the current of the associated grounded star point. Since residual current may occur due to transient saturation during high through fault currents restraining is required for restricted earth fault protection. For this purpose two different measuring principles are available.

i.e. the biased differential scheme and the phase comparison scheme. The biased differential scheme can be used, if the actual accuracy limit factor of the CT is sufficient for the application. In the case of heavy CT saturation, the phase comparison scheme is recommended to be used instead, to avoid unwanted tripping. The protection function block used for this application is called restricted differential protection. Standard over current and earth fault protection relays do not provide adequate protection for star connected primary transformer windings particularly if the neutral is earthed through impedance.

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In the SLR140 Relay For unearthed star or delta wound transformers standard earth fault protection will work in the same way as restricted earth fault protection.

Connection scheme for restricted earth-fault protection

6. Configuration and Parameter Settings Default Screen

3OC + 1EF RELAY SLR14O

6.1. Measured Values

Use the DOWN key of the front panel to move to item MEASURE of the main menu, where the values of the phase current and the earth fault current to be viewed in percentage by the user.

R :0 A Y :0 A B :0 A E :0 A

Use the LEFT key to move to main menu. Use the DOWN key to select the menu functions. Use the RIGHT key to go into the selected menu.

Let us we show all main menu functions one by one. The settings of the selected functions can be read and set separately in the sub


USER MANUAL SLR140

menus of each functions. Available protection stages:

I>, I>>(IL Setting) Io>, Io>>(Io Setting) CBFP (CBFP Set)

Available other stages:

Fault Log Digital IP Set Digital OP Set Force Op Stages Enable Stages Scaling System Setting

6.2. Principle of Parameter Setting This example shows how to change the IL Settings. Same as the principle is used to change other parameters,

Use the RIGHT key to open the setting level appears on the display. Use the UP and DOWN key to change the setting values. The changing values are confirmed by press the RIGHT key. Push the DOWN key to return the next submenu. Use the UP and DOWN key to change the setting values. The changing values are confirmed by press the RIGHT key. Push the LEFT key twice to return to the main menu.

Fault Log Via the submenus of the Fault Log menu the following can be read and set:

This function views the measured values of the phase current and earth fault

Current where the faults are recorded at the moment of last 8 fault tripping with date and time.

Function reset.


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IL Settings Via the submenus of the IL Setting menu the following can be read and set:

I> Set, I> curve, t> TMS for Low set characteristics. As well as I>> Set and t>> TMS for high set characteristics. Increase/decrease the settings values are done by UP/DOWN keys.

Io Settings Via the submenus of the Io Setting menu the following can be read and set:

Io> Set, Io> curve, to> TMS for Low set characteristics. As well as Io>> Set and to>> TMS for high set characteristics. Increase/decrease the settings values are done by UP/DOWN keys.

Digital IP Set Via the submenus of the Digital IP Set menu the following can be read and set:

Binary input 1, Binary input 2 configuration operation delay time. CBFP delay time.

Digital OP Set

Via the submenus of the Digital OP Set menu, all the protection function of output relays T1, T2, T3, T4 and T5 contacts can be open (ON) or close (OFF). There are five relay outputs that can be programmed to respond the relay start signal, trip signal, or both the start and trip signals. The sixth relay is act as an internal relay failure indicator. I> OP Config. Low set over current output relay configuration. I>> OP Config. High set over current output relay configuration. Io> OP Config. Low set earth fault current output relay configuration. Io>> OP Config.

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High set earth fault current output relay configuration. Latch OP Config.

Hand reset or self reset function output relay configuration. CBFP OP Config.

Circuit Breaker Failure Protection output relay configuration. ALM OP Config.

Alarm output relay configuration. BI 1

Binary input 1 output relay configuration. BI 2

Binary input 2 output relay configuration.

Force OP Stages Via the submenus of the Force OP Stages menu, all the functional test for output relays and output LED’s are done. 6.3. Enabling and Disabling Protection Functions

Enable Stages Via the submenus of the Enable Stages menu, all the protection functions can be enabled (ON) or disabled (OFF)

I>Enable Over current low set stage (I>) I>>Enable Over current high set stage (I>>) Io>Enable Earth fault current low set stages (Io>) Io>>Enable Earth fault current high set stages (Io>>) CBFP Enable Circuit breaker failure protection (CBFP) BI1 Binary Input 1 BI2 Binary Input 2

Scalling

Via the submenus of the Scalling menu, the primary and secondary current ratings are read and set, where the primary current setting having maximum 1000A as well as the secondary current setting having 1A or 5A

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System Setting

Via the submenus of the System setting menu the following can be read and set:

Setting of date & time. RS485 Module configurations Port enables Protocol, Parity, and Device ID.

Reclose Function Via the submenus of the Reclose Function menu the following can be read and set:

No of Reclose. Cycle Time 1, Cycle Time 2, Cycle Time 3, Cycle Time 4, Recycle Time. Reclose Pulse Time. Lockout Reset Time.

7. Communication The PC Port is used for on – site parameterization of the relay, for downloading of a program and for reading relay parameters to a PC. For connection to a PC, one RS 232C serial port is available on the front panel of the relay.

7.1. Mod bus RS485 Communication

The interface popularly known as RS-485 is an electrical specification for multipoint systems that use balanced lines. RS-485 is similar to RS-422, but RS-422 allows just one driver with multiple receivers whereas RS-485 supports multiple drivers and receivers.

RS-485 is actually a physical layer specification which allows multiple nodes to be connected to a differential 2-wire bus. Unlike RS-232 which can be full duplex (transmit and receive at the same time), RS-485 exchanges must be half duplex. This means there must be rules about who can talk and when.

RS485 is the most versatile communication standard in the standard series defined by the EIA, as it performs well on all four points. That is why RS485 is currently a widely used communication interface in data acquisition and control applications where multiple nodes communicate with each other.

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8. Output Response Curves 8.1. Low Set Characteristics Curves The inverse definite minimum time (IDMT) characteristics curve in SLR140 with IEC 60255 having seven selectable curves which are following:

8.1.1. Normal inverse curve

8.1.2. Very inverse curve


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8.1.3. Extremely inverse curve

8.1.4. Long time inverse curve


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8.1.5. ‘1.3S’ curve

8.1.6. ‘3S’ curve


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8.2. High Set Characteristics

The high-set is selectable between definite time and instantaneous tripping characteristics. 9. Application Circuit for 3O/C and 1E/F


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10. Protection Stages

10.1. Over Current Protection Stages

A. Over Current Stage I> (50)

Current Setting Range 10% – 300% Definite Time Characteristic Operating Time 0.05 – 300.0 s (step 0.01) Inverse Time Characteristic 7 Characteristic Curve Sets EI,VI,NI,LTI,3.0 S,1.3 S,DT Time Multiplier K 0.05 – 2.0 Starting Time <60 ms Resetting Time <60 ms Resetting Ratio 0.97 Inaccuracy Starting ±2% of set value Operating Time Definite Time ±1% or ±30 ms Operating Time Inverse Time ±5% or at least ±30 ms (I<50 x In)

B. Over Current Stage I>> (51)

Current Setting Range 100% – 4000% Definite Time Characteristic Operating Time 0.05 – 2.0 s (step 0.01)


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Starting Time <30 ms Resetting Time <60 ms Resetting Ratio 0.97 Inaccuracy Starting ±2% of set value Operating Time ±1% or ±30 ms

10.2. Earth Fault Current Protection A. Earth Fault Current Stage Io> (50N)

Current Setting Range 5% – 100% Definite Time Characteristic Operating Time 0.05 – 300.0 s (step 0.01) Inverse Time Characteristic 4 Characteristic Curve Sets EI,VI,NI,LTI,1.3Sec,3.0Sec,DMT Time Multiplier K 0.05 – 2.0 Starting Time <60 ms Resetting Time <60 ms Resetting Ratio 0.97 Inaccuracy

Starting ±2% of set value or ±3% of rated value

Operating Time Definite Time ±1% or ±30 ms Operating Time Inverse Time ±5% or at least ±30 ms (I,<5 x In)

B. Earth Fault Current Stage IO>> (51N)

Current Setting Range 50% – 2000%

Definite Time Characteristic Operating Time 0.05 – 2.0 s (step 0.01) Starting Time <50 ms Resetting Time <60 ms Resetting Ratio 0.97 Inaccuracy

Starting ±2% of set value or ±3% of rated value

Operating Time Definite Time ±1% or ±30 ms

10.3. Auto – Reclose Protection

Reclose Delay 0.2s to 14400s (4h) Close Pulse 1s to 10s Reclaim Time 0.2s to 14400s (4h) Dead time Lockout 0.2s to 14400s (4h) Recovery Delay 0.2s to 14400s (4h) Reclose Shots UPTO 4 – (5 Trips)

11. Technical Data

USER MANUAL SLR140


11.1. Auxiliary voltage

Supply Voltage 24~110V AC/DC or 85~265V AC/DC Supply Frequency 50Hz or 60Hz VA Rating 3 VA Typical Typical Burden 8W (For Non-Operating Relay) Maximum Burden <12 W (For Operating Relay) Power Of Withstand 20ms

11.2. Current Inputs

CT Inputs Phase 1A/5A characteristics

Range Of Measurement 0.3 In to 24 In

Burden At In <0.2 VA

Permanent Thermal Withstand 3 In

1 Sec Thermal Withstand 100 In

Dynamic Withstand (1/2 Cycle) 250 In

Earth-fault CT Input1A/5A characteristics

Range Of Measurement 0.03 In to 2.4 In

Burden At In <0.5 VA

Permanent Thermal Withstand 1 In

1 Sec Thermal Withstand 40 In

11.3. Trip Contacts (T1 & T2)

Number Of Contacts 2 Making Contacts Rated Voltage 250V ac Continuous Carry 5A Max. Making Current 15A Breaking Capacity, AC 2000 W/VA Breaking Capacity, DC (L/R = 40ms) 50W Contact Material AgNi 90/10

11.4. Accuracy

Protection Thresholds ± 5 % Time Delay ± 5 % with a Minimum of 50 ms Measurements ± 5 %

USER MANUAL SLR140


12. Construction 12.1. Mechanical

Mounting Panel Mounting Front Panel Standard DIN mm x mm Approximate Weight 2.3 kg.

12.2. Dimensional Drawing

USER MANUAL SLR140

12.3. Panel Mounting


USER MANUAL SLR140

12.4. Semi-Flush Mounting

13. Commissioning


USER MANUAL SLR140


Before the commissioning of the relay, it is necessary to check that the following:

The current transformer’s secondary rated current in conformity with the rating mentioned on the relay label.

Wiring is in conformity with the connection diagram. Auxiliary supply should be match with the auxiliary supply range of the

relay label

Tripping circuit is OK

USER MANUAL SLR140


14. Ordering Information

When you asking for quotations or ordering, please tick the appropriate box in line with your requirements and sent it to us.

Models □ Non-Communicable SLR140 □ Communicable SLR140

( with Auto-Recloser)

Auxiliary voltage □ 24-110V AC/DC □ 85-265V AC/DC

Ct- Rating □ 1A □ 5A

USER MANUAL SLR140

STELMEC LIMITED SB UNIT – III, PLOT NO 14/15, N.H.NO.8, SATIVALI – EAST, DIST: THANE – 401202, MAHARASHTRA, INDIA. FAX: +91-250-3255415, TEL: +91-250-2480671/097. e-mail: [email protected]. Visit Us At: www.stelmec.com.

15. Contact Information


mailto:[email protected]

Documents

SLR140 - AR