User’s User’ s manual and Tec Technical hnical description
2 Document No: 1MDV07203-YN Issued: July 2007 Version A
NI 40/41 Numerical Three phase Over current and Earth Fault Relay
Data subject to change without notice
Contents
Sr. No.
Description
Page 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
HM HMI features
11
9
Me 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
Te Technical Data
37
18
Maintenance & Repair
41
19
Internal relay failure
41
20
Dimensions and mounting
41
21
Ordering Details
42
2 Document No: 1MDV07203-YN Issued: July 2007 Version A
NI 40/41 Numerical Three phase Over current and Earth Fault Relay
Data subject to change without notice
Contents
Sr. No.
Description
Page 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
HM HMI features
11
9
Me 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
Te Technical Data
37
18
Maintenance & Repair
41
19
Internal relay failure
41
20
Dimensions and mounting
41
21
Ordering Details
42
3
1
About this manual This manual provides information on the protection relay NI 40/41 and its applications, foc using on giving a technical description descripti on of the relay. The manual also provides basic information informati on on the protection relay NI 40/41 and presents detailed instructions instructi ons on how to use the Human-Machine Interface Inter face (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
Three-phase over current protection
51
MODEL NI40
NI41
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
Measuring of 3 Phase current in primary or secondary terms
X
X
Measurement Measurement of Neutral current in primary or secondary terms.
X
X
Extensive relay internal self supervision monitoring relay hardware and software.
X
X
Trip lockout function
X
X
X
X
Aux. supply on, on, Fault alarm / trip, Internal Relay Relay Failure indication indication LED's LED's
X
X
Display of fault cause indication
X
X
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 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
Measurement, Monitoring and Recording Function
Latest Five fault data recording
Display and Indications 16 x 2 Alpha numeric LCD display with backlit
Inputs and Outputs
Relay Design
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. 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 mil limeter counts.
5
Brief description of operation In addition to its comprehensive protection functions, the relay provides additional features such as measurement 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 value-ad ded 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 measur e 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. 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 curren t 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 configurat ion of the output relay matrix, the trip signals of the over current and earth fault units are obtained as contact functions.
5
IL1
IL2
IL3
TRIP
THREE PHASE INVERSE TIME OR DEFINITE TIME LOW SET OVER CURRENT PROTECTION
THREE PHASE INVERSE TIME OR DEFINITE TIME LOW SET EARTH FAULT PROTECTION
51
SIGNAL 1
SIGNAL 2 51N
Io
IRF
Figure 1: Protection function of Three phase over current and earth fault relay Type NI 40
IL1
THREE PHASE INVERSE TIME OR DEFINITE TIME LOW SET OVER CURRENT PROTECTION
51
IL2
THREE PHASE INSTANTANEOUS OR DEFINITE TIME HIGH SET OVER CURRENT PROTECTION
50
IL3
THREE PHASE INVERSE TIME OR DEFINITE TIME LOW SET EARTH FAULT PROTECTION
51N
Io
THREE PHASE INSTANTANEOUS OR DEFINITE TIME HIGH SET EARTH FAULT PROTECTION
50N
TRIP
SIGNAL 1
SIGNAL 2
IRF
Figure 2: Protection function of Three phase over current and earth fault relay Type NI 41
6
6
Connection diagram
E R U L I A F Y A L E R L A N R E T N I
Figure 3
F R I
Connection diagram for three phase Numerical overcurrent and earth fault relay type NI 40/41 with core balance CT for earth fault.
7
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.
8
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
9
The energizing currents of the over current unit are connected to terminals R1-R2, Y1-Y2 & B1B2 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 ter minals 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 selfsupervision system, or on loss of auxiliary supply, the output relay drops off and the NO contact 28-29 closes.
Signal Diagram
Figure 6
The figure below schematically illustrates how the trip and control signals can be configured to obtain required protection function.
10
7.
Signal
IL1, IL2, IL3
Energizing current of phase L1, L2 & L3
Abbreviation
Io
Neutral Current (Residual Current)
Tr
Trip relay
S1
Signal Relay 1
S2
Signal Relay 2
IRF
Internal relay Failure
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).
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.
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.
Insulation test voltage between the primary and secondary side and the protective earth 2 kV, 50 Hz, 1 min Rated power Pn 5W Voltage ranges of the power supply modules : 1. Uaux = 80...265 V dc/ac 2. Uaux = 18...80 V dc 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.
11
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 1 2 3
4
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:
4
•
Top: Power On (green)
•
Middle: IRF (Red)
•
Bottom: Alarm (Green) / Trip (red)*
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.
Figure 9
Navigation, Clear and Enter buttons
* In order to reset the trip indicating LED press Enter Key [‘E’] and left arrow button [ ]for three seconds after entering the main menu.
12
The next table gives short explanations of the push-buttons and their functions. Table 1. Push Button functions Key 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
E
Enter Key - Used to store the data in the settings
C
Escape Key - Used to come at the top of the menu from anywhere
E
+
C
Password Key - Used to enter the edit mode in Settings and Configuration menu
+
E
Release Key - Used to release the latched indication / Relay
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.
13
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.
Figure 10 Display in idle mode 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.
Figure 11 Display in view mode
When the display is in the setting mode, you can also edit the settings.
Figure 12 Display in setting mode 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.
14
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):
10.
•
MAIN MENU
•
Group menu
•
Subgroup menu
•
Parameter menu
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”
15
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. 1 To enter a Group or sub group menu, press right arrow key & to return back / exit, press Left arrow key.
12.
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.
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 displ ayed 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 curr ent 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*
* Refer note on sheet 22.
16
The below figure represents measur ement main, group and parameter menu Main Menu M E A S U R E M E N T
Group Menu
Parameter Menu
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 I N A L
N
O M
L
1
:
X
X
.
X
X
X
.
X
X
X
.
X
X
X
.
X
X
X
X X
X
A
X
X X
X
A
X
X X
X
A
X
X X
X
A
M E A S U R E M E N T N
O M
L
2
:
X
M E A S U R E M E N T N
O M
L
3
:
X
M E A S U R E M E N T N
O M
I
0
:
X
M E A S U R E M E N T
M E A S U R E M E N T
A M P E R E
A
m p
L
1
:
X
M E A S U R E M E N T A
m p
L
2
:
X
M E A S U R E M E N T A
m p
L
3
:
X
M E A S U R E M E N T A
Figure 17 Measurement menu and its sub menu's
m p
I
0
:
X
17
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. 2. 3. 4. 5.
Press an arrow button to access the main menu. Use DOWN arrow key to select RECORDED DATA which is the second in the main menu. Press right arrow to enter the first group menu "Current". Use right arrow key to enter into the sub group menu "Event 1" of the submenu Current. 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 indiv idual fault in "Trip count" group menu. Main Menu
Group Menu
Figure 18 The below figure represents the main menu "Recorded Data" and its group menu's
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"
19
Sub Group Main Menu
Parameter Menu
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. In the same manner Each Current Events (Event 2- Event 5) have recorded data of Three phase currents and earth current
20
Main Menu
Group Menu
Figure 21 The below figure represents the group menu "Recorded data - Time" and its Subgroup menu's “Events 1-5"
21
Sub group menu
Parameter menu
Figure 22 The below figure represents the subgroup menu "Event 1" of Time group menu and its parameter menu's t>, t>>, to>, to>> 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 23The below figure represents the group menu "Recorded data - trip count" and its parameter menu's
22
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 setti ng 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. 1.
Press an arrow button to access the main menu.
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" Main Menu
Group 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 Group Menu
Parameter Menu
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.
* 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)
23
1st Parameter menu
2nd Parameter menu
Figure 26 The display shows second parameter menu for setting secondary current
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
24
Main Menu
Group menu
Figure 27 The display shows group menus in order for Main menu "Settings”
25
The low set stage of the overcurrent unit and the low set stage of the earth faul t 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 durati on 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*. Group menu
Parameter Menu
Figure 28 The display shows parameter menus for selection of setting 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>). Group menu
Parameter Menu
Figure 29 The display shows parameter menus for setting of I> Group menu
Parameter Menu
Figure 30 The display shows parameter menus for setting of Io> *
All new characteristics curve, if added in future, shall be located at the end of existing curve’s in parameter menu.
26
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 to>) for DMT curve, if selected, or TMS Factor 'K' incase any IDMT curve is selected. The relay will only show t> (for I>) or t0> (for I0>) or "k" based on the type of curve characteristic selected. Parameter Menu for I> setting
Parameter Menu for Io> setting 1st parameter
2nd parameter
Figure 31 The display shows parameter menus for setting of t> to t o> when DMT characterisitics is selected. 13. t0 can be set between 0.05 sec - 64 Sec. The method of changing the time in sec for t> to t o> is the same as that of setting the Values of I> & I0> as shown above. (Steps 7-10)
Figure 32 The display shows parameter menus for setting of k> when any IDMT curve is 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 I0>>” is for setting the value of I>> or I0>>.
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>'.
27
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.
Configuration This menu is used for l l l
Blocking of particular protection Assigning Hand reset (HR) or Self reset (SR) to trip relay Tr. 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. 1.
Press an arrow button to access the main menu.
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. Group menu
Parameter Menu
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).
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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. 1.
Press an arrow button to access the main menu.
2.
Use DOWN arrow key to select CONFIGURATION which is the last in the main menu.
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.
29
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
7.
Releasing the keys will show that the cursor on right hand side of LCD to blink.
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. Main Menu
Group Menu
Figure 42.The display above shows the group menu 'Relay configuration' in configuration menu. How to route desired protection to trip and/or signal relay 1.
Press an arrow button to access the main menu.
2.
Use DOWN arrow key to select CONFIGURATION which is the last in the main menu.
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. 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.
30
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.
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 individual or group of relays.
*
Figure 45 The display shows the various selection available for routing protection to desired relay 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 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.
* None means no relay shall be energized for trip operation.
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Group Menu
Sub Group Menu
Figure 47 The display shows the group & subgroup menu for configuration of earth fault protection Sub-Group Menu
Parameter menu
Figure 48 The display shows the parameter 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.
** High set available for NI41 only
32
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 characteristic is selected with selection of configuration of curve for the low set overcurrent stage I> and low set earth-fault stage I0>
When IDMT characteristic has been selected, the operate time of the stage will be a functi on 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 :
(refer “How to change parameters for I> or I0>”)
IDMT characteristic Four standard curves named extremely inverse, very inverse, normal inverse and longtime 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 :
t [s] =
kxb I
a
I>
-1
where t = operate time in seconds k = time multiplier I = measured current value
Slope of the time/ current curve set
a
Normal inverse Very inverse Extremely inverse Long-time inverse
0.02 1.0 2.0 1.0
b
0.14 13.5 80.0 120.0
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.
I> = set start current value The relay includes four time/current curve sets according to BS 142. 1966 and IEC 60255-3. The following requirements with regard to operate time tolerances are specified in the standard (E denotes accuracy in per cent, - = not specified):
I/I> 2 5 7 10 20
Normal inv. 2.22 E 1.13 E 1.01 E 1.00 E
Very inv.
Extremely inv.
Long-time inv.
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 rela y is calculated using the mathematical expression above, these additional times of about 30 ms in total have to be added to the time received.
33
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.
t/s 70 60 50 40 30
20
10 9 8 7 6 5 4 3
2
1 0.9 0.8 0.7 0.6 0.5 0.4 0.3 k 1.0
0.2
0.8 0.6 0.1 0.09 0.08 0.07
0.4 0.3 0.2
0.06 0.05
0.1
0.04 0.05 0.03
0.02 1
2
3
4
5
6 7 8 9 10
20 I/I>
Figure 49 Extremely inverse-time characteristics of the overcurrent and earth-fault unit
34
t/s 70 60 50 40
30
20
10 9 8 7 6 5 4
3
2
1 0.9
k
0.8
1.0
0.7
0.9
0.6
0.8
0.5
0.7 0.6
0.4
0.5 0.3
0.4 0.3
0.2 0.2
0.1 0.09
0.1
0.08 0.07 0.06 0.05 0.05 0.04
0.03
0.02 1
2
3
4
5
6
7
8 9 10
20 I/I>
Figure 50 Very inverse-time characteristics of the overcurrent and earth-fault unit
35
t/s 70 60 50 40
30
20
10 9 8 7 6 5 4
3
k 1.0 0.9
2
0.8 0.7 0.6 0.5 1 0.9
0.4
0.8 0.7
0.3
0.6 0.5 0.2 0.4
0.3 0.1 0.2
0.05 0.1 0.09 0.08 0.07 0.06 0.05 0.04
0.03
0.02 1
2
3
4
5
6
7
8 9 10
20 I/I>
Figure 51 Normal inverse-time characteristics of the overcurrent and earth-fault unit
36
t/s 700 600 500 400
300
200
100 90 80 70 60 50 40
30
20
10 9 8
k
7
1.0
6
0.9
5
0.8 0.7
4
0.6 0.5
3
0.4 2 0.3
0.2 1 0.9 0.8 0.7
0.1
0.6 0.5 0.4 0.05 0.3
0.2 1
2
3
4
5
6
7 8
9 10
20
I/I>
Figure 52 Long-time inverse-time characteristics of the overcurrent and earth-fault unit
37
17
Technical Data Energizing quantities, rated values & limits Type designation
NI 40/41
Energizing Inputs Rated Current In
1A
5A
a) Continuous
4A
20 A
b) For 1 Second
100 A
500 A
Dynamic current withstand
250 A
1250 A
Input impedance
<100mW
<20mW
Thermal Withstand
Auxiliary power supply Rated auxiliary supply
18 - 80 V DC or 80 - 265 V AC/DC
Rated Frequency
50 Hz
Power Consumption a) Under quiescent condition b) Under Operating condition
-4W -6W
Indications Relay supply healthy
Green LED
Protection start
Green LED
Protection trip Relay internal failure
Red LED Red LED
Relay display
16 x 2 Alpha numeric LCD display with backlit
Over current and earth fault relay settings Over 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
* Any new characteristic curve shall be added at the end of the existing list.
38
Over current and earth fault relay settings Earth Fault Protection Low Set (I0>) Stage a) Current Range
10-80% 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 Multipier l ‘k’
0.05, 0.1 to 1.0 in steps of 0.1
High Set (Io>>) State a) Current Range
10-1000% of In in steps of 1%
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
Output contact ratings Tripping Contact Terminals
11.12 (NO)
Rated Voltage
250V AC/DC
Continuous Carrying capacity
5A
Make and Cary 3.0 sec
15 A
Make and carry 0.5 sec
30 A Breaking capacity for DC when control circuit time constant L/R <40 ms and at voltage a) 220V DC
1A
b) 110V DC
3A
c) 48V DC
5A
Signaling & IRF contact Terminals
21, 22, 23 (C/O) & 24, 25, 26 (C/O) & 29, 28, 27 (C/O)
Rated Voltage
250V AC/DC
Continuous Carrying capacity
5A
Make and Cary 3.0 sec
8A
Make and carry 0.5 sec
10 A
Breaking capacity for DC when control circuit time constant L/R <40 ms and at voltage a) 220V DC
0.15 A
b) 110V DC
0.25 A
c) 48V DC
1A
* Any new characteristic curve shall be added at the end of the existing list.
39
Electrical Tests Insulation Requirement Dielectric test voltage (IEC 60255-5)
2.0 kV. 50 Hz.1 min
Impulse test voltage (IEC 60255-5)
5.0 kV. 1.2/50 ms. 0.5J
Insulation resistant (IEC 60255-5)
>100 MW, 50 Vdc
Interference Test 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, 50 W
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, 1.2/50 ms, 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
Power Supply Test (IEC 60255 - 11, IEC 61000-4-11) 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
40
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
Environmental test 0
0
0
0
0
0
Service temperature range
-10 C....+55 C
Transport and storage temperature range (IEC 60068-2-48)
-40 C....+70 C
Dry heat test, (IEC 60068-22-2)
-55 C....+70 C
Cyclic (12+12 hour cycle) damp heat test, (IEC 60068-2-30)
<95%, +40 C, 96% Rh
Cold 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
0
0
0
41
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
19
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.
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
20
proper overhaul. No parts of the relay are site replacable.
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.
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 2 measuring input, one 6 mm , one 4 mm or one 2 or 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.
42
21 Ordering details Relay Type
Current Input
Aux Supply
Article No.
NI 40
1A
80-265 V AC/DC
1MYN742837-A
NI 40
5A
80-265 V AC/DC
1MYN742837-B
NI 40
1A
18-80 V AC/DC
1MYN742837-C
NI 40
5A
18-80 V AC/DC
1MYN742837-D
NI 41
1A
80-265 V AC/DC
1MYN742838-A
NI 41
5A
80-265 V AC/DC
1MYN742838-B
NI 41
1A
18-80 V AC/DC
1MYN742838-C
NI 41
5A
18-80 V AC/DC
1MYN742838-D
