NI 40-41_Technical Reference Manual

User’s manual and Technical description

Document No 1MDV07203-YN:Issued: July 2007Version A

NI 40/41Numerical Three phase Over current

and Earth Fault Relay

Data subject to change without notice

Contents

Sr. Description PageNo. No.

1 About this manual 3

2 The use of the relay 3

3 Feature 3

4 application 4

5 Brief description of operation 4

6 Connection diagram 6

7 Power supply module and output relay card 10

8 HMI features 11

9 Menu systems 14

10 Main Menu 14

11 Group menu, subgroup menu and Parameter menu. 14

12 Measurements 15

13 Recorded data 17

14 Settings 22

15 Configuration 27

16 Time current characteristics 32

17 Technical Data 37

18 Maintenance & Repair 41

19 Internal relay failure 41

20 Dimensions and mounting 41

21 Ordering Details 42

2

3

1 About this manual

This manual provides information on the protection relay NI 40/41 and its applications, focusing on giving a technical description of the relay. The manual also provides basic information on the protection relay NI 40/41 and presents detailed instructions on how to use the Human-Machine Interface (HMI) of the relay, also known as the Man-Machine Interface (MMI).

2 The use of the relay

NI 40/41 is a versatile protection relay mainly designed to protect incoming and outgoing feeders in a wide range of feeder applications. NI 40/41 is based on a microprocessor environment. A self supervision system continuously monitors the operation of the relay. The HMI has a Liquid Crystal Display (LCD) which makes the local use of the relay

3 Features

Protection functions ANSI Code MODEL

NI40 NI41

Three-phase over current protection 51 X X

low-set stage (IDMT or DT)

Three-phase over current 50 X

protection, high -set stage (DT)

Earth fault protection, low-set 51N X X

stage (IDMT or DT)

Earth fault protection, 50N X

high-set stage (DT)

Facility of site selection of IDMT curves for low set stage X X

Four standard IDMT curves (NI, VI, EI, LI) as per IEC standard. X X

Wide and accurate numerical settings with perfect long time stability. X X

Measurement, Monitoring and Recording Function

Measuring of 3 Phase current in primary or secondary terms X X

Measurement of Neutral current in primary or secondary terms. X X

Latest Five fault data recording

Extensive relay internal self supervision monitoring relay hardware and software. X X

Trip lockout function X X

Display and Indications

16 x 2 Alpha numeric LCD display with backlit X X

Aux. supply on, Fault alarm / trip, Internal Relay Failure indication LED's X X

Display of fault cause indication X X

Inputs and Outputs

Four accurate current inputs X X

Normally open heavy duty output contacts X X

Two change over signaling output contacts X X

Freely configurable output contacts X X

Dedicated output contact for relay internal self supervision X X

Low burden on current transformer X X

Relay Design

Relay case with a degree of protection according to IP54 X X

Design confirming to requirements of IEC 60255 X X

Design immune to any kind of electromagnetic interference X X

Dimensions: 196 (H) x 166 (W). Depth behind panel only 158 mm. X X

4

4 Application

This composite relay facilitates combined three phase over current and neutral current relay functions for use with selective short-circuit and time-over current protection of distribution feeders. It can also be applied to feeder earth fault protection in solidly earthed, resistance earthed and isolated neutral networks.

As multi-function solutions, these relays can be flexibly adapted to different kind of incoming and outgoing feeders in varying substation environments. The NI 40/41 series of relays can be used for protection of feeders of utility and industrial applications.

With its compact size and unique technical features, NI 40/41 is an ideal relay for retrofit, small switchgear and switchgear with limited space. A small mounting depth makes it possible to install the relay in places where space is money and every millimeter counts.

5 Brief description of operation

In addition to its comprehensive protection functions, the relay provides additional features such as measurement data in primary value, RMS value in terms of In, fault data recording, fault indications etc. LCD display and three front LEDs enable fast fault indication. The fault recorded data helps user for quick fault diagnostics and analysis. The relay also has freely configurable output relays for tripping and signaling. These value-added features make NI 40 / 41 a product beyond compare.

The combined over current and earth-fault relay is a secondary relay to be connected to the current transformers of the object to be protected. The three phase over current unit and the earth-fault unit continuously measure the phase currents and the neutral current of the protected object. On detection of a fault, the relay trips the circuit breaker, provides alarm, records fault data etc. in accordance with the application and the configured relay functions.

When the phase current exceeds the set start current of the low-set stage I>, and when the set operate time at definite time elapses or the calculated operate time at inverse time operation elapses, the over current unit operates.

In the same way, the high-set stage I>> of the over current unit ( for NI 41 ) operates and delivers a trip signal when the set start current exceeds and the set operate time elapses. When the earth-fault current exceeds the set start current of the low-set stage Io>, and the set operate time at definite time operation elapses or the calculated operate time at inverse time operation elapses, the earth-fault unit operates. In the same way the highset stage Io>> of the earth fault unit ( for NI 41 ) operates and delivers a trip signal when the set start current exceeds and the set operate time elapses.

The low-set stage of the over current unit and the low-set stage of the earth-fault unit may be given definite time or inverse definite minimum time (IDMT) characteristic. When the IDMT characteristic is chosen, four time / current curves are available that comply with BS 142:1962 and IEC 255 standards and are named "Normal inverse", "Very inverse", “Extremely inverse” and "Long-time inverse".

By appropriate configuration of the output relay matrix, the trip signals of the over current and earth fault units are obtained as contact functions.

Figure 1: Protection function of Three phase over current and earth fault relay Type NI 40

Figure 2: Protection function of Three phase over current and earth fault relay Type NI 41

THREE PHASE INVERSE TIME OR DEFINITE TIME LOW SET OVER CURRENT PROTECTION

51

THREE PHASE INVERSE TIMEOR DEFINITE TIME LOW SET EARTH FAULT PROTECTION

51N

THREE PHASE INVERSE TIME OR DEFINITE TIME LOW SET OVER CURRENT PROTECTION

51

THREE PHASE INSTANTANEOUS OR DEFINITE TIME HIGH SET OVER CURRENT PROTECTION

50

THREE PHASE INSTANTANEOUS OR DEFINITE TIME HIGH SET EARTH FAULT PROTECTION

THREE PHASE INVERSE TIMEOR DEFINITE TIME LOW SET EARTH FAULT PROTECTION

51N

50N

IL1

IL2

IL3

Io IRF

TRIP

SIGNAL 1

SIGNAL 2

5

IL1

IL2

IL3

Io IRF

TRIP

SIGNAL 1

SIGNAL 2

6 Connection diagram

Figure 3 Connection diagram for three phase Numerical overcurrent and earth fault relaytype NI 40/41 with core balance CT for earth fault.

6

IRF

INTE

RN

AL

RE

LAY

FA

ILU

RE

Connection diagram

Figure 4 Connection diagram for three phase Numerical overcurrent and earth fault relay type NI 40/41 with residual connection of CT’s for earth fault.

7

Uaux Auxiliary voltage

Tr, S1, S2, IRF Output relays

IRF Self-supervision (Internal relay failure)

TRIP Trip output relay

SIGNAL 1 Signal on operation of the overcurrent / Earth fault unit

SIGNAL 2 Signal on operation of the overcurrent / Earth fault unit

T1 Power On indication

T2 IRF indication

T3 Start / Trip Indication

Figure 5 Terminal arrangement of Numerical three phase over current and earth fault relay Type NI 40/41

8

Signal Diagram

The energizing currents of the over current unit

are connected to terminals R1-R2, Y1-Y2 & B1-

B2

The relay can also be used in single-phase or

two-phase applications simply by leaving one

or two energizing inputs unoccupied.

The energizing current for the earth-fault unit is

connected to terminals E1-E2.

The auxiliary supply voltage of the relay is

connected to terminals 14-16. At d.c. supply the

positive lead is connected to terminal 16. The

level of the voltage to be applied to the terminals

depends on the type of power supply module .

Available levels are 18-80v DC or 80-265v

AC/DC. For further details earth see the

description of the power supply module. The

permitted auxiliary voltage range of the relay is

marked on the relay front panel.

Output relay Tr is a heavy-duty trip relay

capable of controlling most circuit breakers.

The operate signals of the different protection

stages are routed to the trip relay by selecting

relay configuration inside the main menu of the

relay and routing the desired relay for that

protection function.

On delivery from the factory all the protection

stages are routed to the trip relay. A latching of

the output relay Tr can be selected by setting

the configuration of TRIP as HR (Hand Reset).

Output relays S1 and S2 can be used for

signaling on operation of the relay module. The

signals to be routed to the output relays S1 and

S2 is carried out by selecting relay configuration

submenu in Configuration menu and then

routing over current or earth fault for desired

signaling relays S1& S2

Both signaling relays, S1 & S2 are configured

for signaling on operation of the over current

unit and earth fault unit which is the default

setting of the relay on delivery from the factory.

Output relay IRF functions as output relay for

the self-supervision system of the protection

relay. The relay IRF is energized under normal

operating conditions and contact gap 27-28 is

closed. If a fault is detected by the self-

supervision system, or on loss of auxiliary

supply, the output relay drops off and the NO

contact 28-29 closes.

Figure 6 The figure below schematically illustrates how the trip and control signals can be configured to obtain required protection function.

9

Signal IL1, IL2, IL3

Abbreviation Io

Tr

S1

S2

IRF

Energizing current of phase L1, L2 & L3

Neutral Current (Residual Current)

Trip relay

Signal Relay 1

Signal Relay 2

Internal relay Failure

7. Power Supply Module and Output relay Card

To be able to operate the relay needs a secured auxiliary voltage supply. The power supply module forms the voltages required by the protection relay cards and the auxiliary relays. The power supply module contains the power supply unit and the control circuits of the output relays. Output relay card contains trip and signal output relays.

The primary side of the power supply module is protected with a fuse, F1, located on the PCB of the module. The fuse size is 1 A (slow).

The power supply unit is a pulse-width modulated (PWM) dc/dc converter with galvanically isolated primary and secondary sides. It forms the dc secondary voltages required by the protection relay module; i.e. +24 V, + 12 V and +8 V. The output voltages +12 V and +24 V are stabilized in the power supply module, while the +5 V & + 3.3 V required by the processor card are stabilized by linear power supply on it.

A green LED indicator POWER ON on the

system front panel is lit when the power supply

module is in operation. The supervision of the

voltages supplying the electronics is located in

the power supply module. If a secondary

voltage differs too much from its rated value, a

self-supervision alarm will be generated. An

alarm is also issued on loss of auxiliary supply.

There are two versions of power supply

modules available. For both types, the

secondary sides and the relay driver circuits are

identical, but the input voltage ranges differ.

Insulation test voltage between the primary and

secondary side and the protective earth

2 kV, 50 Hz, 1 min

Rated power P 5Wn

Voltage ranges of the power supply modules :

1. U = 80...265 V dc/acaux

2. U = 18...80 V dcaux

The power supply module for 80...265v can be

fed from either an ac source of a dc source. The

18...80V power supply module is designed for

dc supply only. The permitted auxiliary voltage

range of the relay is marked on the relay system

front panel.

10

1

2

34

8 HMI features

Front panel

The front panel of the protection relay includes:

• An alphanumeric 16 x 2 characters LCD (Liquid crystal display) with backlight which makes the local use of the relay safe and easy.

• Three indicator LEDs (Green, Red, Green/Red)

• An HMI push button section with four arrow buttons and buttons for clear/cancel and enter

Figure 8 Front view of Numerical three phase overcurrent and earth fault relay Type NI 40/41

1 LCD

2 HMI push button section

3 Indicator LEDs:

• Top: Power On (green)

• Middle: IRF (Red)

• Bottom: Alarm (Green) / Trip (red)*

4 Voltage rating, Current rating, Article No., Relay Serial No. details

Navigation

Push Button

The front panel of the relay module contains four arrow push buttons and buttons for Clear [C] and enter [E]. The arrow buttons are used for navigating the menu structure and for adjusting the setting values.

* In order to reset the trip indicating LED press Enter Key [‘E’] and left arrow button [ ]for three seconds after entering the main menu.

Figure 9 Navigation, Clear and Enter buttons

11

The next table gives short explanations of the push-buttons and their functions.

Table 1. Push Button functions

Left Key - Used to come out of the given sub-menu

- Also used to change the digit location to left

in settings mode

Up Key - Used to scroll up in the menu/sub menu- Also used to increment the value of the digit in settings menu

Down Key - Used to scroll down in the menu/sub-menu - Also used to decrement the value of the digit in settings menu

Right Key - Used to go inside the given menu/sub-menu - Also used to change the digit edit location to

right in settings mode

Enter Key - Used to store the data in the settings

Escape Key - Used to come at the top of the menu from anywhere

Key Functions

+Password Key - Used to enter the edit mode in Settings and

Configuration menu

E

E C

C

+ Release Key - Used to release the latched indication / RelayE

Display

Display Test at power up

When connecting the auxiliary voltage to the relay:

1. The "Power on" indicator glows green.

2. The display shows the relay type “NI 40” or “NI 41”.

3. Simultaneously start/trip indication glows, if the same existed before the last power failure.

4. The backlight is lit.

5. The display will be returned to the idle mode and the backlight turned off.

6. The display will continuously show three phase dynamic current and earth fault leakage current in secondary terms per unit value.

12

Display modes

When the display is in idle mode, the dynamic values of phase and earth current will be displayed in secondary terms per unit values.

When the display is in the view mode, you can only view the parameters. The below figure shows current in phase L1 in primary terms.

When the display is in the setting mode, you can also edit the settings.

Display backlight

Normally the backlight of the display is off.

• The backlight is lit in approx 5 sec. after pressing any arrow button on the HMI. This displays “ABB” on the LCD.

• If the HMI panel is not used for approximately ten seconds, the backlight will be turned off automatically, and relay will resume idle mode.

13

Figure 12 Display in setting mode

Figure 11 Display in view mode

Figure 10 Display in idle mode

9. Menu system

The menus are used for reading and setting the parameters, reading recorded values, and so forth. The menu system is divided into three or four levels (depending on the parameters):

• MAIN MENU

• Group menu

• Subgroup menu

• Parameter menu

10. Main menu

The main view is the MAIN MENU, which is followed by the hierarchical structure of group, subgroup and parameter menus. In all menu levels, the first row of the display is dedicated for the header text that shows the name of the current menu.

The main menu contains four main groups:

• MEASUREMENTS

• RECORDED DATA

• SETTINGS

• CONFIGURATION

To enter the main menu press the down arrow button for approximately 5 seconds after back light is displayed.

Figure 13 The display shows one of the main menu group

To navigate between the main menu groups, use UP and Down arrow keys.

To return the display to the top of all menu press [C] button

The display will be returned to the idle mode on expiration of the time out.

11. Group menu and Sub group menu and parameter menu

The menu structure contains several Groups and Subgroups. The name of the main menu group is always shown on the first line. The second line displays either the name of the group menu, the name of the parameter and the parameter value, or just the parameter value, in which case it is also the name of the parameter.

Figure 14 The display showing the first group menu

of the main menu “recorded data”

14

1 To enter a Group or sub group menu, press right arrow key & to return back / exit, press Left arrow key.

2 To navigate between the main levels in the submenus, use up or down arrow keys.

3 On entering group/subgroup menu, use right arrow key to enter parameter menu.

4 To navigate between the levels in the parameter menu, use up or down arrow keys.

5 Press [C] push button to return the display to the top of main menu.

12. MEASUREMENTS

You can monitor all measured values via MEASUREMENTS in the HMI menu. In the measurement menu, the values on phases L1, L2, L3 & neutral current are displayed in

• Secondary term per unit values

• Primary terms

To access the measured values on phases L1, L2, L3 and Io via the HMI menu

1. Press the down arrow button to access the main menu.

2. The first main menu is the Measurement

3. Press the right arrow key to enter the group menu.

4. The first group menu is the "Nominal".

5. Use of right arrow key allows you to enter the parameter menu directly, which has 4 parameters showing the current of phases L1, L2, L3 and Earth fault current Io in secondry terms.

6. From the group menu “nominal” push the down arrow button to go the next Group menu of measurement menu. This is the second & the last group menu "AMPERE".

7. Use of right arrow key allows you to enter the parameter menu directly, which shows 4 parameters, the currents of Phase L1, L2, L3 and Earth fault current Io in primary terms respectively.

‘Nominal’ group displays the PU value of currents in secondary terms. The 'Ampere' group menu displays the current in primary terms, e.g. when the relay is connected to 300/5A CT & the current of 150 A is flowing, the current displayed in nominal measurement is 0.50 and the current in Ampere will be 150A*

15

* Refer note on sheet 22.

Figure 15 The display showing the first sub group menu of group menu. “Recorded data-current”.

Figure 16 The display showing the first parameter menu of first subgroup & group menu of recorded data menu.

Main Menu Group Menu Parameter Menu

M E A S U R E M E N T

N O M I N A L

M E A S U R E M E N T M E A S U R E M E N T

N O M L 1 : X X . X X


N O M L 2 : X X . X X

The below figure represents measurement main, group and parameter menu


A M P E R E


N O M L 3 : X X . X X


N O M I 0 : X X . X X


A m p L 1 : X X X X X A






A m p I 0 : X X X X X A

16

Figure 17 Measurement menu and its sub menu's

13. Recorded Data

The menu displays

• stored event values of the protection functions I>, I>>, Io> & Io>>

• stored duration between start and unit trip situation of the protection functions I>, I>>, Io> & Io>>

• registers number of trips of I>, I>>, Io> & Io>>

The parameter values measured at the trip instance are recorded in the registers. The recorded data, in the event list will keep rolling with first in first out principle. The data are stored in the registers even if the auxiliary voltage supply to the relay is interrupted. All settings and fault records are maintained in a non - volatile memory.

How to monitor recorded data

1. Press an arrow button to access the main menu.

2. Use DOWN arrow key to select RECORDED DATA which is the second in the main menu.

3. Press right arrow to enter the first group menu "Current".

4. Use right arrow key to enter into the sub group menu "Event 1" of the submenu Current.

5. Further use of right arrow key displays the Parameter menu showing Current value in phase L1 during that particular event.

6. Use Down arrow keys to view current value in phases L2, L3 and Earth current.

7 In order to return to the event 1 press left arrow key

8. Using the navigation keys currents of previous 4 events can be viewed as described above.

9. On returning to Current menu Use Down arrow to go to other group menu "Time" and "Trip Count"

10. Similarly Duration of start to unit trip situation of I>, I>>, Io> & Io>> can be viewed in event subgroup menu of Time group menu & trip counts of individual fault in "Trip count" group menu.

17

Figure 18 The below figure represents the main menu "Recorded Data" and its group menu's

Main Menu Group Menu

18

Group Menu Sub Group Menu

Figure 19 The below figure represents the group menu "Recorded data - Current" and its Subgroup menu's "Events 1-5"

Figure 20 The below figure represents the subgroup menu "Event 1" and its parameter menu's showing the value of current L1, L2, L3 & Io for event 1.

Sub Group Main Menu Parameter Menu

19

In the same manner Each Current Events (Event 2- Event 5) have recorded data of Three phase currents and earth current


Figure 21 The below figure represents the group menu "Recorded data - Time" and its Subgroup menu's “Events 1-5"

20

Figure 22 The below figure represents the subgroup menu "Event 1" of Time group menu and its parameter menu's t>, t>>, to>, to>>

Figure 23The below figure represents the group menu "Recorded data - trip count" and its parameter menu's

21

Sub group menu Parameter menu

Similarly each time events (Event 2- Event 5) have recorded data of three phase currents and earth current duration between start & trip of unit.

Group menu Parameter menu

Figure 24 The display shows first group menu of main menu "Settings”

4. further use the right key to enter the parameter menu.

5. The first parameter menu is for setting the primary current

14. Settings

This menu is used to change the value of primary and secondary* currents and setting of overcurrent and earth fault lowset and higset** values.

In order to secure all parameters, all settings and values are recorded in non volatile memory. If for any reason, the content of memory are disturbed, all default setting from the DSP controller are written in the memory. If the memory is damaged the relay will set an alarm signal through IRF output relay and will display IRF code on LCD screen.

How to change the setting values.


2. Use DOWN arrow key to select SETTINGS which is the third in the main menu.

3. Pressing right key shows group menu "Primary CT ratio"

* The secondary current rating 1A / 5A of the relay is fixed as per article no/name plate. Relay is programmed with default factory setting of 100A primary and 1 A secondary. The relay should be ordered such to have In = 1A or 5A in line with CT specification. "I primary" & “I secondary” should be set accordingly in order to observe correct measurement in measurement parameter menu.

** For NI 41 only# Maximum primary current that can be set is 1600A. (Primary current for measurement purpose only)

22


Figure 25 The display shows first parameter menu for setting primary of group menu "Primary Settings"

6. In order to change the value first press Enter key [E] and then [C] with E key still pressed.

7. Releasing the keys will show that the cursor on right hand side of LCD blink.

8. Use up or down keys to select the appropriate digits and left and right arrows to move between #digits thereby set the desired value of primary current .

9. Press Enter key to save the setting.

10. The second parameter menu is for setting secondary CT ratio 1 or 5 Amps.

Group Menu Parameter Menu

1st Parameter menu

2nd Parameter menu

11. In order to change the value first press Enter key [E] and then [C] with E key still pressed

12. Releasing the key will show the cursor on right hand side of LCD blink.

13. Use up or down keys to choose between 1 or 5 Amp.

14. Press Enter key [’E’] to save the setting.

15 The next group menus are settings for Low and High** set of Over current and earth fault i.e. I>,I>>, Io>, Io>>.

** For NI 41 only

23

Figure 26 The display shows second parameter menu for setting secondary current

Main Menu Group menu

Figure 27 The display shows group menus in order for Main menu "Settings”

24

The low set stage of the overcurrent unit and the low set stage of the earth fault unit may be given definite time or inverse definite minimum time (IDMT) characteristic. When the IDMT characteristic is chosen four time/current curves are available. These curves comply with the BS 142 and IEC 60255 and are named "Normal inverse", "Very inverse", "Extremely inverse" and "Long-time inverse".

The high set stage (for NI 41 only) can be used for instantaneous application by keeping the minimum setting of 50ms or for DMT with Maximum time duration of 64 Seconds.

How to set a parameter for I>, Io>

1. The first parameter menu for I> or Io> is the selection of Characteristic Curve*.

2. In order to select/change, first press Enter key [E] and then [C] with E key still pressed else the screen will return to top of all menu.

3. Releasing the key will show the cursor on right hand side of LCD blink.

4. Use up or down keys to choose between DMT and other different types of curves.

5. Press [E] key to save the selected curve.

6. The next parameter menu is for setting the value of I> (or Io>).

Figure 29 The display shows parameter menus for setting of I>

*All new characteristics curve, if added in future, shall be located at the end of existing curve’s in parameter menu.

Group menu Parameter Menu

Figure 28 The display shows parameter menus for selection of setting curve.



Figure 30 The display shows parameter menus for setting of Io>

25

The relay can be set for 0.50 - 2.00 in step of 0.01for Overcurrent i.e. I> and 0.10 - 0.80 of In in steps of 0.01 for Earth fault.

7. In order to change the setting, first press Enter key [E] and then [C] with E key still pressed else the screen will return to top menu.

8. Releasing the key will show the cursor on right hand side of LCD to blink.

9. Use up or down keys to choose between values and left - right arrows for selecting digits.

10. Press [E] key to save the selected value.

11. The next parameter menu is for setting of time (t> to t >) for DMT curve, if selected, or TMS o

Factor 'K' incase any IDMT curve is selected. The relay will only show t> (for I>) or t > (for I >) or 0 0

"k" based on the type of curve characteristic selected.

The setting range of time multiplier 'k' is 0.05, 0.1-1.0 in the steps of 0.1. In order to change the value of “K” , simply use up or down key after entering the edit mode.

How to set parameter for I>> & Io>>

1. The first parameter menu of group menu “High set I>>” or “High set I >>” is for setting the value 0

of I>> or I >>.0

Figure 32 The display shows parameter menus for setting of k> when any IDMT curve is selected.

13. t can be set between 0.05 sec - 64 Sec. The method of changing the time in sec for t> to t > is 0 o

the same as that of setting the Values of I> & I > as shown above. (Steps 7-10) 0

Figure 31 The display shows parameter menus for setting of t> to t > when DMT characterisitics is selected.o

2nd parameter

1st parameter

Parameter Menu for I> setting Parameter Menu for Io> setting

Figure 33 The display shows parameter menus for setting of I>> & Io>>

The setting range of I>> is from 50-2000% of In (In = 1 or 5A).

The setting range of Io>> is from 10-1000% of In (In = 1 or 5A).

2. The next parameter menu is the time 't>' or 'to>'.

26

Figure 34 The display shows parameter menus for setting of t> and to>>.

The setting range of time 't>' & 'to>' is 0.05 to 64Sec. The procedure of changing the the Values of I>> & Io>> and time t> & to> is the same as mention above.

15. ConfigurationThis menu is used for

l Blocking of particular protection

l Assigning Hand reset (HR) or Self reset (SR) to trip relay Tr.

l Relay configuration - to route particular protection to trip and/or signaling relay.

Configuration Blocking

The first group menu of the configuration menu is "Blocking”

Main menu Group menu

Figure 35 The display shows the first group menu Blocking of the main menu "Configuration".

How to enable blocking of protection function.


2. Use DOWN arrow key to select CONFIGURATION which is the last in the main menu.

3. Pressing right key shows group menu "Blocking"

4. Further use the right key to enter the parameter menu.

5. The first parameter menu is for blocking the Low-set over current.


Figure 36 The display shows first parameter group for blocking of I>.

6. As a company default setting all the protection funcitons are unblocked.

7. In order to change the value first press Enter key [E] and then [C] with E key still pressed else will return out of all menus

8. Releasing the keys will show that the cursor on right hand side of LCD to blink.

9. Use up or down keys to select 'YES' for blocking or 'NO' to keep protection in USE.

10. Press Enter key to save the setting.

11. Use the down arrow to go to next parameter menu(s).

27

Figure 37 The display shows second parameter group for blocking of I>>**.

Figure 38 The display shows third parameter group for blocking of Io>

Figure 39 The display shows fourth and last parameter group for blocking of Io>>**

The procedure of blocking of I>>, Io>, Io>> is same as mentioned above for blocking I>.

Configuration Trip

The second group menu of the configuration menu is "Trip”

Main menu Group menu

Figure 40 The display shows the second group menu "TRIP" of the main menu "Configuration".

This menu is used to latch (the output relay remains picked up after operation ) the trip relay Tr on a fault, although the energizing current falls below the start current. The trip signal is to be manually rest by pushing the push button [E] and left arrow key ( )simultaneously after accessing main menu.

How to latch & reset the trip relay Tr.



3. Press right key to enter group menus. Press down arrow for"Trip" which is second in the group menu.

4. Use the right key to enter the parameter menu.

Figure 41 The display shows parameter menu for selecting Trip relay Tr. for Hand or Self reset.

28

5. As a company default setting the trip relay Tr. is set as SR or self reset.

6. In order to change the mode of reseting the trip relay Enter key [E] and then [C] with [E] key still pressed else will return out of all menus


8. Use up or down keys to select 'HR' for selecting trip relay Tr. in latched mode or 'SR' or self reset which allows the trip relay Tr. to reset as soon as energizing input goes below setting level.

9. Press Enter key [E] to save the setting.

10. In order to reset the Tr. relay when latched, press any key and wait till the backlight glows. Then press left arrow key with “E” key pressed for 3 seconds.

Relay Configuration

Relay configuration' is the third and last group menu of 'Configuration' menu.

How to route desired protection to trip and/or signal relay



3. Press right key to enter group menus. Press down arrow for "Relay config." which is third/last in the group menu.

4. Use the right key to enter the sub group menu.


Figure 42.The display above shows the group menu 'Relay configuration' in configuration menu.

Group Menu Sub group menu

Figure 43 The display shows subgroup menu for routing Over current protection.

5. Further use of right arrow key button allows us to enter into the parameter menu. The first parameter menu is for routing low set overcurrent stage to desired relay.

29

Sub group menu Parameter Menu

Figure 44 The display shows Parameter menu for routing Lowset overcurrent protection

6. As a company default setting all the protection trip are routed to trip and signalling relay.

7. In order to change the desired relay for routing this protection, press the Enter key [E] and then [C] with [E] key still pressed.


9. Use up or down keys to select individual or group of relays.

10. Press Enter key [E] to save the setting.

11. Use the down arrow key for routing Highset overcurrent to desired relay.

Figure 45 The display shows the various selection available for routing protection to desired relay or group of relays.

Figure 46 The display shows the parameter menu for configuration of overcurrent protection.

12. The High set stage of over current is routed to trip and/or signal relay in similar manner.

13. The second subgroup menu is for routing earth fault to trip or signal relay.

30

*

* None means no relay shall be energized for trip operation.

31

Group Menu Sub Group Menu

Figure 47 The display shows the group & subgroup menu for configuration of earth fault protection

14. Navingation and selection of relay for the E/F protection is same as mentioned above for Overcurrent.

Sub-Group Menu Parameter menu

Figure 48 The display shows the parameter menu for configuration of Earth fault protection.

** High set available for NI41 only

16 Time/current

characteristic

The operation of the low-set overcurrent stage I> and the low-set earth-fault stage I0> is based on definite time or inverse time characteristic, as selected by the user. The operation charac-teristic is selected with selection of configura-tion of curve for the low set overcurrent stage I> and low set earth-fault stage I0>

(refer “How to change parameters for I> or I0>”)

IDMT

characteristic

Four standard curves named extremely inverse, very inverse, normal inverse and long-time inverse are available. The relationship between current and time complies with the BS 142. 1966 and IEC 60255-3 standards and can be expressed as follows :

where

t = operate time in seconds

k = time multiplier

I = measured current value

I> = set start current value

The relay includes four time/current curve sets according to BS 142. 1966 and IEC 60255-3.

When IDMT characteristic has been selected, the operate time of the stage will be a function of the current; the higher the current, the shorter the operate time. The stage includes four time/current curve sets - four according to the BS 142 and IEC 60255 standards

The stope of the time/current curve sets is determined by the constants a and b as follows :

According to the standard BS 142.1966 the normal current range is defined as 2...20 times the set start current. Additionally the relay must start at the latest when the current exceeds 1.3 times the set start current, when the time/current characteristic is normal inverse, very inverse or extremely inverse. At long-time inverse characteristic, the normal range is 2...7 times the set start current and the relay must start when the current exceeds 1.1 times the setting.

The following requirements with regard to operate time tolerances are specified in the standard

(E denotes accuracy in per cent, - = not specified):

I/I> Normal inv. Very inv. Extremely inv. Long-time inv.

2

5

7

10

20

2.22 E

1.13 E

-

1.01 E

1.00 E

2.34 E

1.26 E

-

1.01 E

1.00 E

2.44 E

1.48 E

-

1.02 E

1.00 E

2.34 E

1.26 E

1.00 E

-

-

The actual operate time of the relay, presented in the graphs in Fig. 40…43, includes an additional filter and detection time plus the operate time of the trip output relay. When the operate time of the relay is calculated using the mathematical expression above, these additional times of about 30 ms in total have to be added to the time received.

Slope of the time/ a bcurrent curve set

Normal inverse 0.02 0.14Very inverse 1.0 13.5Extremely inverse 2.0 80.0Long-time inverse 1.0 120.0

t [s] =kxb

I

I>

a -1

32

Figure 49 Extremely inverse-time characteristics of the overcurrent and earth-fault unit

If the set start current exceeds 2.5 x In, the maximum permitted continuous current carrying capacity of the energizing inputs (4 x In) must be observed.

At inverse time characteristic the effective setting range of the low-set overcurrent stage is 0.5…2.5 x In, although start current settings within the range 2.5…5.0 x In can be set on the relay. At inverse time characteristic any start current setting above 2.5 x In of the low-set stage will be regarded as being equal to 2.5 x In.

1 3 4 5 6 7 8 9 102 20 I/I>

0.05

0.1

0.2

0.3

0.4

0.6

0.8

1.0

k

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.090.1

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

7

89

10

20

30

40

70

60

50

t/s

33

Figure 50 Very inverse-time characteristics of the overcurrent and earth-fault unit

1 2 3 4 5 6 7 8 9 10 20 I/I>

0.05

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.91.0

k

0.02

0.03

0.04

0.05

0.06

0.07

0.08

0.090.1

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

7

8

910

20

70

60

50

40

30

t/s

34

Figure 51 Normal inverse-time characteristics of the overcurrent and earth-fault unit

0.05

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.91.0

k

1 2 3 4 5 7 8 9 10 20 I/I>60.02

0.03

0.04

0.05

0.06

0.07

0.080.090.1

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

7

8

910

20

30

40

50

60

70

t/s

35

Figure 52 Long-time inverse-time characteristics of the overcurrent and earth-fault unit

1 2 3 4 5 10 206 7 8 9I/I>

0.05

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.91.0

k

0.2

0.3

0.4

0.5

0.6

0.7

0.80.9

1

2

3

4

5

6

7

89

10

20

30

40

50

60

70

80

90100

200

300

400

500

600

700

t/s

36

17 Technical Data

Auxiliary power supply

Rated auxiliary supply

Rated Frequency

Power Consumption

a) Under quiescent condition

b) Under Operating condition

80 - 265 V AC/DC

- 4 W

- 6 W

18 - 80 V DC or

50 Hz

Indications

Relay supply healthy

Protection start

Protection trip

Relay internal failure

Relay display

Green LED

Green LED

Red LED

Red LED

16 x 2 Alpha numeric LCD display with

backlit

Over current and earth fault relay settingsOver Current Protection

Low Set (I>) Stage

a) Current Range 50-200% of In in steps of 1%

b) Operate time at DMT mode 0.05 - 64 Sec in steps of 0.01 sec

c) Item/current characteristic at Normal Inverse

IDMT mode (site-selectable) Very Inverse

Extreme Inverse

Long-time Inverse*

d) Time Multiplier “K” 0.05, 0.1 to 1.0 in steps of 0.1

High Set (I>>) State

a) Current Range 50-2000% of In in steps of 1/5

b) Operate time at Inst. mode 50 m Sec

c) Operate time at DMT mode 0.05 - 64 Sec in steps of 0.01 sec

Type designation

Energizing Inputs

NI 40/41

Rated Current In

Thermal Withstand

a) Continuous

b) For 1 Second

Dynamic current withstand

Input impedance

1 A

4 A

100 A

250 A

<100mW

5 A

20 A

500 A

1250 A

<20mW

Energizing quantities, rated values & limits

37

* Any new characteristic curve shall be added at the end of the existing list.

Over current and earth fault relay settings

Earth Fault Protection

10-80% of In in steps of 1%

0.05 - 64 Sec in steps of 0.01 sec

Normal Inverse

Very Inverse

Extreme Inverse

Long-time Inverse*

0.05, 0.1 to 1.0 in steps of 0.1

Low Set (I >) Stage0

a) Current Range

b) Operate time at DMT mode

c) Item/current characteristic at

IDMT mode (site-selectable)

d) Time Multipier l ‘k’

10-1000% of In in steps of 1%

50 m Sec

0.05 - 64 Sec in steps of 0.01 sec

High Set (Io>>) State

a) Current Range

b) Operate time at Inst. mode

c) Operate time at DMT mode

Tripping Contact

Output contact ratings

Terminals

Rated Voltage

Continuous Carrying capacity

Make and Cary 3.0 sec

Make and carry 0.5 sec

Breaking capacity for DC when control circuit time constant L/R <40 ms and at

voltage

a) 220V DC

b) 110V DC

c) 48V DC

11.12 (NO)

250V AC/DC

5 A

15 A

30 A

Signaling & IRF contact

Terminals

Rated Voltage

Continuous Carrying capacity

Make and Cary 3.0 sec

Make and carry 0.5 sec

Breaking capacity for DC when control circuit time constant L/R <40 ms and at

voltage

a) 220V DC

b) 110V DC

c) 48V DC

21, 22, 23 (C/O) &

24, 25, 26 (C/O) &

29, 28, 27 (C/O)

250V AC/DC

5 A

8 A

10 A

1 A

3 A

5 A

0.15 A

0.25 A

1A

38

* Any new characteristic curve shall be added at the end of the existing list.

High Frequency (1 MHz) disturbance test (IEC 60255-22-1), common mode 2.5 kV

High Frequency (1 MHz) disturbance test (IEC 60255-22-1), differential mode 1.0 kV

Fast transient (IEC 60255-22-4, class III and IEC 801-4, level 4), power supply port 4 kV, 2.5 kHz, 50W

Fast transient (IEC 60255-22-4, class III and IEC 801-4, level 4), other ports 2 kV, 2.5 kHz, 50W

Electrostatic discharge (IEC 60255-22-2 and IEC 801-2, Class III), air discharge 8 kV

Electrostatic discharge (IEC 60255-22-2 and IEC 801-2, Class III), contact discharge 6 kV

RF electromagnetic field test (IEC 61000-4-3 and ENV 50140) 10 V/m, f=80...1000MHz

Conducted RF disturbance test (IEC 61000-4-5 and ENV 50141) 10 Vm, f=150 kHz ....

1000 Mhz

Surge immunity test (IEC 60255-22-5 and IEC 61000-4-5), common mode 2 kV, 1.2/50ms, 12W

Surge immunity test (IEC 60255-22-5 and IEC 61000-4-5), differential mode 1 kV, 1.2/50ms, 2W

Conducted and radiated RF emission test (IEC 60255-25, EN55011-CISPRII), Class A

conducted emission (main)

Conducted and radiated RF emission test (IEC 60255-25, EN55011-CISPRII), Class A

conducted emission (main)

Power frequency magnetic field immunity test (IEC 61000-4-8), continuous 100 A/m

Power frequency magnetic field immunity test (IEC 61000-4-8), Short duration 300 A/m

Interference Test

Variation voltage 68...255 V

Interruption 80 V - 50% 0... 200ms

Interruption 80 V - 100% 0... 30 ms

Interruption 255 V - 100% 0... 160 ms

Ripple in DC voltage Max. 12% of DC value

Power Supply Test (IEC 60255 - 11, IEC 61000-4-11)

Insulation Requirement

Dielectric test voltage (IEC 60255-5)

Impulse test voltage (IEC 60255-5)

Insulation resistant (IEC 60255-5)

2.0 kV. 50 Hz.1 min

5.0 kV. 1.2/50 ms. 0.5J

>100 MW, 50 Vdc

Electrical Tests

39

Mechanical Tests

Seismic test (ANSI/IEEE C37.98-1987), operating basis earthquake test 0.5...5.25 g

Seismic test (ANSI/IEEE C37.98-1987), safe shut down earthquake test 0.5...7.5g

Vibration response and endurance test (IEC 60255-2-1) 2...13.2 Hz, + 1.0 mm

13.2...100 Hz, + 0.7g

Shock response and endurance test (IEC 60255-21-2) Class 1, 11 ms

Bump test (IEC-60255-21-2) 20g. 1000 bumps/direction

0 0Service temperature range -10 C....+55 C0 0Transport and storage temperature range (IEC 60068-2-48) -40 C....+70 C0 0Dry heat test, (IEC 60068-22-2) -55 C....+70 C

0Cyclic (12+12 hour cycle) damp heat test, (IEC 60068-2-30) <95%, +40 C, 96% Rh0 0Cold heat test, (IEC 60068-22-1) -10 C....-20 C

Corrosion test Battelle test

Degree of protection by enclosure, IP test (IEC 60529) IP 54

Environmental test

40

18 Maintenance & Repair

When the protection relay is operating under the conditions specified in the section "Technical data", the relay is practically maintenance free. The relay modules include no parts or components subject to an abnormal physical or electrical wear under normal operating conditions.

If the environmental conditions at the relay operating site differ from those specified, as to temperature, humidity, or if the atmosphere around the relay contains chemically active gases or dust, the relay ought to be visually inspected in association with the relay secondary test.

On request, the relay can be given a special treatment for the protection of the printed circuit boards against stress on materials, caused by abnormal environmental conditions.

If the relay fails in operation or if the operating values remarkably differ from those of the relay specifications, the relay should be given a

proper overhaul. No parts of the relay are site replacable.

Please contact the manufacturer or his nearest representative for further information about checking, overhaul and recalibration of the relay.

Note !

Numerical protection relays contain electronic circuits which are liable to serious damage due to electrostatic discharge. Before removing a module containing electronic circuits, ensure that you are at the same electrostatic potential as the equipment, for instance, by touching the relay case.

Note !

Static protection relays are measuring instruments and should be handled with care and protected against moisture and mechanical stress, especially during transport.

20 Dimensions and mounting

The relay is housed in normally flush mounted case. The relay case is made up of mild steel power coated with RAL 7035. A front cover frame with rubber gasket provides a degree of protection by enclosure to IP54 between the relay case and the panel surface when the relay is panel mounted.

The relay is fixed / mounted on the panel with the support of two relay holder on top and bottom of the relay. These holders are made up of PBT

(poly butylene terephthalate) , which holds the relay firmly.

Two terminal strips and two multipole connectors are mounted on the back of the relay case to facilitate all input and output connections. To each multipole connector i.e.

2 2measuring input, one 6 mm , one 4 mm or one 2or two 2.5 mm wires can be connected. The

power supply input, trip contacts and signalling outputs are available on two ten pole detachable connectors.

19 Internal relay failure (IRF)

In addition to the protection functions, the relay module is provided with a self-supervision system which continuously supervises the function of the microprocessor, its program execution and the electronics.

Shortly after the internal self-supervision system has detected a permanent relay fault in the relay module, the Red IRF indicator on the front panel is lit. At the same time the module puts forward a control signal to the output relay

of the self-supervision system (IRF relay) of the protection relay NI 40/41.

In most fault situations, a fault code indicating the nature of the fault, appears on the display of the module. The internal relay fault code shown on the display remains active until the internal fault possibly disappears.

When such internal relay fault occurs, the fault code should be recorded for statistical and maintenance purposes and immediately stated with order of service.

41

Relay Type

NI 40

NI 40

NI 40

NI 40

NI 41

NI 41

NI 41

NI 41

21 Ordering details

Current Input

1A

5A

1A

5A

1A

5A

1A

5A

Aux Supply

80-265 V AC/DC

80-265 V AC/DC

18-80 V AC/DC

18-80 V AC/DC

80-265 V AC/DC

80-265 V AC/DC

18-80 V AC/DC

18-80 V AC/DC

Article No.

1MYN742837-A

1MYN742837-B

1MYN742837-C

1MYN742837-D

1MYN742838-A

1MYN742838-B

1MYN742838-C

1MYN742838-D

42

www.abb.co.in

No. 14, Mathura RoadP.O. Amar NagarFaridabad 121 003Tel : +91 129 2275592

2279627, 5049000Fax : +91 129 2279692/5019

4th FloorNo. 9Elgin RoadKolkatta 700 020Tel.: +91 33 22832906/8Fax: +91 33 22832990

ABB HouseDr. S.B. PathBallard EstateMumbai 400 038Tel. +91 22 56318231-39Fax: +91 22 56318276-77

4th & 5th Floor,Maruti Heights,Amanaka, G.E. RoadRaipur 492 099ChhattisgarhTel: +91 771 4701016/17-18Fax: +91 771 4701019/20

Embassy Star, 1st Floor,No. 8, Place Road,Vasanth NagarBangalore 560 052Tel: +91 80-22949779Fax: +91 80 22949808

Century PlazaNos. 3C, 3D and 3F, 3rd Floor,561 / 562, Anna SalaiTeynampet (Mount Road)Chennai 600 018Tel. +91-44 24340201Fax: +91 44 24340282

ABB LimitedDistribution AutomationProductsManeja,Vadodara 390 013 IndiaTel. : +91 265 2604385/86

+91 265 2604394/97Fax : +91 265 2638922Emai: [email protected]

1MD

V07

0203

-YN

07

- 20

07

Documents

NI 40-41_Technical Reference Manual