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MRI1-IU - Voltage controlled time overcurrent relay
Contents 3 Introduction and application Features and characteristics Design 3.1 3.1.1 3.1.2 3.1.3 3.1.4 3.Relay testing and commissioning 6.1 Power-On 6.2 Testing the output relays and LEDs 6.3 Checking the set values 6.4 Secondary injection test 6.4.1 Test equipment 6.4.2 Example of test circuit 6.4.3 Checking the input circuits and measured values 6.4.4 Checking the operating and resetting values of the relay under normal and low voltage 6.4.5 Checking the relay operating time 6.4.6 Checking the high set element 6.4.7 Checking the external blocking and reset functions 6.5 Primary injection test 6.6 Maintenance Technical data 7.1 Measuring input circuits 7.2 Common data 7.3 Setting ranges and steps 7.3.1 Definite time overcurrent protection relay 7.3.2 Inverse time overcurrent protection relay 7.4 Inverse time characteristics 7.5 Output contacts Order form
Connections Analogue input circuits Output relays Blocking input External reset input LEDs
Working principle 4.1 Analogue circuits 4.2 Digital circuits 4.3 Voltage controlled tripping characteristic 4.4 Demand imposed on the main current transformers 7 Operation and setting 5.1 Display 5.2 Setting procedure 5.2.1 Current setting values for overcurrent relay (ISN and ISL) 5.2.2 Time current characteristics for phase overcurrent element (CHAR I>) 5.2.3 Trip delay or time multiplier for phase overcurrent element (tI>) 5.2.4 Reset setting for inverse time tripping characteristics in the phase current path 5.2.5 Current setting for high set element (I>>N and I>>L) 5.2.6 Trip delay for high set element (tI>>) 5.2.7 Undervoltage set reference value 5.2.8 Nominal frequency 5.2.9 Adjustment of the slave address 5.2.10 Blocking the protection functions and assignment of the output relays 5.3 Indication of measuring values and fault data 5.3.1 Indication of measuring values 5.3.2 Indication of fault data 5.4 Reset
Important: For additional common data of all MR-relays please refer to manual "MR - Digital Multifunctional relays". This technical manual is valid for software version D08-6.00.

TD_MRI1-IU_05.04_GB

Introduction and application
Features and characteristics
The digital multifunctional relay MRI1-IU is an universal protection device for alternators and other equipment. It provides the following functions: Independent (definite) time overcurrent protection (DMT) Inverse time overcurrent protection (IDMT) with the following selectable characteristics: Normal Inverse Very Inverse Extremely Inverse Automatic change over characteristic by undervoltage
Digital filtering of the measured values by using discrete Fourier analysis to suppress the high frequence harmonics and DC components induced by faults or system operations Selectable protective functions between: definite time overcurrent relay and inverse time overcurrent relay Selectable inverse time characteristics according to BS 142 and IEC 255-4: Normal Inverse Very Inverse Extremely Inverse Reset setting for inverse time characteristics selectable High set overcurrent unit with instantaneous or definite time function. Two-element (low and high set) overcurrent relay. Voltage controlled characteristic Measuring of phase currents in operation without short-circuit storage of tripping values Numerical display of setting values and actual measured values. Withdrawable modules with automatic short circuit of C.T. inputs when modules are withdrawn.

Design

Connections

Figure 3.1:

Connection diagram
3.1.1 Analogue input circuits The protection unit receives the analogue input signals of the phase currents IL1 (B3-B4), IL2 (B5-B6), IL3 B7B8)), as well as the phase voltages via isolated input transformers in V-connection. The constantly detected current measuring values are galvanically decoupled, filtered and finally fed to the analogue/digital converter.
3.1.3 Blocking input The blocking functions adjusted before will be blocked if an auxiliary voltage is connected to (terminals) D8/E8. (Refer to chapter 5.2.10)
3.1.4 External reset input Please refer to chapter 5.4.
3.1.2 Output relays The MRI1-IU has five output relays. Two output relays with two change-over contacts and two with one change-over contacts can be assigned as required. All relays are working current relays, only the relay for self supervision is an idle current relay. To prevent that the C.B. trip coil circuit is interrupted by the MRI1-IU first, i.e. before interruption by the C.B. auxiliary contact, a dwell time is fixed. This setting ensures that the MRI1-IU remains in self holding for 200ms after the fault current is interrupted.

Working principle

Analogue circuits
The LEDs left from the display are partially bi-coloured, the green indicating measuring, and the red fault indication. The LED marked with letters RS lights up during setting of the slave address of the device for serial data communication. The 5 LEDs arranged at the characteristic points on the setting curves support the comfortable setting menu selection.
The incoming currents from the main current transformers on the protected object are converted to voltage signals in proportion to the currents via the input transformers and burden. The noise signals caused by inductive and capacitive coupling are suppressed by an analogue R-C filter circuit. The analogue voltage signals are fed to the A/Dconverter of the microprocessor and transformed to digital signals through Sample- and Hold-circuits. The analogue signals are sampled at 50 Hz (60 Hz) with a sampling frequency of 800 Hz (960 Hz), namely, a sampling rate of 1.25 ms (1.04 ms) for every measuring quantity. (16 scans per period). The incoming voltages from the main voltage transformers are led to operational amplifiers through the input transformers and R-C filters.

Figure 3.2:

Front panel Figure 4.1: Block diagram

Digital circuits

Switching-over at undervoltage (Example ISL = 0.5)
The essential part of the MRI1-IU relay is a powerful microcontroller. All of the operations, from the analogue digital conversion to the relay trip decision, are carried out by the microcontroller digitally. The relay program is located in an EPROM (ElectricallyProgrammable-Read-Only-Memory). With this program the CPU of the microcontroller calculates the three phase currents in order to detect a possible fault situation in the protected object. For the calculation of the current value an efficient digital filter based on the Fourier Transformation (DFFT Discrete Fast Fourier Transformation) is applied to suppress high frequency harmonics and DC components caused by fault-induced transients or other system disturbances. The calculated actual current values are compared with the relay settings. If a phase current exceeds the pickup value, an alarm is given and after the set trip delay has elapsed, the corresponding trip relay is activated. The relay setting values for all parameters are stored in a parameter memory (EEPROM - Electrically Erasable Programmable Read-only Memory), so that the actual relay settings cannot be lost, even if the power supply is interrupted. The microprocessor is supervised by a built-in "watchdog" timer. In case of a failure the watchdog timer resets the microprocessor and gives an alarm signal, via the output relay "self supervision". selection of current transformers. It implies that, if an electromechanical relay is replaced by MRI1, a high accuracy limit factor is automatically obtained by using the same current transformer.

10 ISN=1.0

ISL=0.5 tI>=

1.0 1.0

0.6 0.8 1
In case of failure (short-circuit of the alternator) the alternator voltage decreases. The MRI1-IU will recognise this and then switch over without delay to a lower pickup value IS. The value ISL can be adjusted. As a result, shorter tripping periods of the overcurrent and short-circuit step can be achieved. The adjusted tripping characteristics (normal inverse, very inverse, extremely inverse or DMT is maintained). Setting ranges see in 7.3.
Demand imposed on the main current transformers
Voltage controlled tripping characteristic
The voltage controlled time overcurrent relay MRI1-IU is the combination of a time overcurrent relay (basic unit MRI1) and an additional undervoltage supervision unit. The undervoltage supervision unit has an influence on the tripping delay of the overcurrent and short-circuit steps by switching two setting points. In normal operation (at nominal voltage) the MRI1-IU operates like a normal time overcurrent relay with preselected tripping characteristic (IDMT, DMT) and adjusted pick up value IS. The following diagram explains the switching-over to another IS value. ISN is the pickup value during normal operation and ISL at undervoltage (low voltage).
The current transformers have to be rated in such a way, that a saturation should not occur within the following operating current ranges: Independent time overcurrent function: K1 = 2 Inverse time overcurrent function: K1 = 20 High-set function: K1 = 1.2 - 1.5 K1 = Current factor related to set value Moreover, the current transformers have to be rated according to the maximum expected short circuit current in the network or in the protected objects. The low power consumption in the current circuit of MRI1, namely <0,2 VA, has a positive effect on the selection of current transformers. It implies that, if an electromechanical relay is replaced by MRI1, a high accuracy limit factor is automatically obtained by using the same current transformer.

Operation and setting

Display Display shows SEG Actual measured values, (IL1, IL2, IL3, U12, U23, U31) max. Current settings Trip delay characteristics Voltage switch value 0s / 60s f=50 / f=60 EXIT 1 - 32 Tripping currents and other fault data SAV? SAV! First part (e.g. D01-) Sec. part (e.g. 8.00) TRI? PSW? TRIP XXXX SEG
possible indication messages on the display
Function Normal operation Measured operating values: Measuring range overflow Setting values: phase (I>; CHAR I>; tI>; I>>; tI>>) voltage Reset setting (only available at inverse time characteristics) Nominal frequency Blocking of function Slave address of serial interface Recorded fault data: Save parameter? Save parameter! Software version Manual trip Inquire password Relay tripped Secret password input System reset

Table 5.1:

Pressed push button
<SELECT/RESET> one time for each <SELECT/RESET> <SELECT/RESET> one time for each parameter <SELECT/RESET><+><-> <SELECT/RESET> <+><->
Corresponding LED L1, L2, L3, U L1, L2, L3, U I >; CHAR I>; tI>; I>>; tI>>; LED U I>; CHAR I>; tI>
<SELECT/RESET><+><-> <+> until max. setting LED of blocked value parameter <SELECT/RESET><+><-> RS <SELECT/RESET> L1, L2, L3, U one time for each phase I>, I>> <ENTER> <ENTER> for about 3 s <TRIP> one time for each part <TRIP> three times <TRIP><ENTER> <TRIP>or after fault tripping <SELECT/RESET> <+><-><ENTER> <SELECT/RESET> for about 3 s
The table below shows how the display and LEDs indicate the set values of MRI1-IU Set parameter Low set current at nominal voltage Low set current at low voltage Tripping characteristics Time delay tI> Time multiplier at inverse time characteristics High set current at nominal voltage High set current at low voltage Time delay Undervoltage setting Rated frequency Slave address
Table 5.2: Indicated set values
LED alight I>; U I>; U CHAR I> tI> tI> I>>; U I>>; U tI>> U RS

Colour

I> yellow, U green I> yellow, U red Yellow Yellow Yellow I>> Yellow, U green I>> yellow, U red Yellow red yellow
Displays shows x In x In DEFT/NINV/ VINV/EINV seconds time multiplier x In x In seconds volt f = 50 / f = -32

Setting procedure

After push button <SELECT/RESET> has been pressed, always the next measuring value is indicated. Firstly the operating measuring values are indicated and then the setting parameters. By pressing the <ENTER> push button the setting values can directly be called up and changed.
5.2.2 Time current characteristics for phase overcurrent element (CHAR I>) By setting this parameter, one of the following 4 messages appears on the display: DEFT NINV VINV EINV Definite Time Normal Inverse Very Inverse Extremely Inverse
5.2.1 Current setting values for overcurrent relay (ISN und ISL) When adjusting the setting values ISN (during normal operation) and ISL (during undervoltage) the values shown on the display are related to the nominal current IN. This means: Pickup current (ISN) = displayed value x rated current (IN) e.g. if displayed value = 1.25, then Is = 1.25 x IN. The pickup of the relay is indicated by the flashing LED I>. LED U flashes red. The pickup value ISL is also indicated by the flashing LED I>. LED U however flashes red.

5.2.9 Adjustment of the slave address Pressing push buttons <+> and <-> the slave address can be set in range of 1-32.
Trip delay for high set element (tI>>)
Independent from the chosen tripping characteristic for I>, the high set element I>> has always a definite-time tripping characteristic. An indication value in seconds appears on the display.
5.2.10 Blocking the protection functions and assignment of the output relays Blocking the protection functions: The blocking function of the MRI1-IU can be set according to requirement. By applying the aux. voltage to D8/E8, the functions chosen by the user are blocked. Setting of the parameter should be done as follows: When pressing push buttons <ENTER> and <TRIP> at the same time, message "BLOC" is displayed (i.e. the respective function is blocked) or "NO_B" (i.e. the respective function is not blocked). The LED allocated to the first protection function I> lights red. By pressing push buttons <+> <-> the value displayed can be changed. The changed value is stored by pressing <ENTER> and entering the password. By pressing the <SELECT/RESET> push button, any further protection function which can be blocked is displayed. Thereafter the blocking menu is left by pressing <SELECT/RESET> again. Function I> I>> Display NO_B BLOC LED/Colour I> yellow I>> yellow The relays are assigned as follows: LEDs I>, I>>, are two-coloured and light up green when the output relays are assigned as alarm relays and red as tripping relays. Definition: Alarm relays are activated at pickup. Tripping relays are only activated after elapse of the tripping delay. After the assignment mode has been activated, first LED I> lights up green. Now one or several of the four output relays can be assigned to current element I> as alarm relays. At the same time the selected alarm relays for frequency element 1 are indicated on the display. Indication "1_ _ _" means that output relay 1 is assigned to this current element. When the display shows "_ _ _ _", no alarm relay is assigned to this current element. The assignment of output relays 1 - 4 to the current elements can be changed by pressing <+> and <-> push buttons. The selected assignment can be stored by pressing push button <ENTER> and subsequent input of the password. By pressing push button <SELECT/RESET>, LED I> lights up red. The output relays can now be assigned to this current element as tripping relays. Relays 1 - 4 are selected in the same way as described before. By repeatedly pressing of the <SELECT/RESET> push button and assignment of the relays all elements can be assigned separately to the relays. The assignment mode can be terminated at any time by pressing the <SELECT/RESET> push button for some time (abt. 3 s). Note: The function of jumper J2 described in general description "MR Digital Multifunctional Relays" has no function. For relays without assignment mode this jumper is used for parameter setting of alarm relays (activation at pickup or tripping). A form is attached to this description where the setting requested by the customer can be filled-in. This form is prepared for telefax transmission and can be used for your own reference as well as for telephone queries. Displayindication _2__ 1___ __3_ 1___ Lighted LED I>: green tI>: red I>>: green tI>>: red

Overcurrent (Low set) Overcurrent (High set)
Table 5.3: Default settings of blocking functions
Assignment of the output relays: The relay has five output relays. The fifth output relay is provided as permanent alarm relay for self supervision is normally on. Output relays 1 - 4 are normally off and can be assigned as alarm or tripping relays to the current functions which can either be done by using the push buttons on the front plate or via serial interface RS485. The assignment of the output relays is similar to the setting of parameters, however, only in the assignment mode. The assignment mode can be reached only via the blocking mode. By pressing push button <SELECT/RESET> in blocking mode again, the assignment mode is selected.
Relay function 1 I> I>> alarm tripping alarm tripping X

Output relays X X

Table 5.4: Example of assignment matrix of the output relay (default settings).
Indication of measuring values and fault data Indication of measuring values
Unit MRI1-IU has the following three possibilities to reset the display of the unit as well as the output relay at jumper position J3=ON. Manual Reset Pressing the push button <SELECT/RESET> for some time (about 3 s) Electrical Reset Through applying auxiliary voltage to C8/D8 Software Reset The software reset has the same effect as the <SELECT/RESET> push button (see also communication protocol of RS485 interface). The display can only be reset when the pickup is not present anymore (otherwise "TRIP" remains in display). During resetting of the display the parameters are not affected.
The following measuring quantities can be indicated on the display during normal service: Apparent current in phase 1 (LED L1 green) Apparent current in phase 2 (LED L2 green) Apparent current in phase 3 (LED L3 green) Phase to phase voltage U12 (LED L1, L2, U green) Phase to phase voltage U23 (LED L1, L3, U green) Phase to phase voltage U31 (LED L1, L3, U green)

Indication of fault data

All of the faults detected by the relay are indicated on the front panel optically. The three phase LEDs L1, L2, L3, the undervoltage LED U and the two function LEDs I>, I>> are used to indicate the fault events. At the time when a certain relay function is energised by a fault, the corresponding function LED lights up yellow. At the same time, the phase LED(s) is (are) flashing red to indicate the faulty phase(s). After the time delay is expired, the relay tripps, the LED(s) for faulty phase(s) indication turn(s) to a steady red light.

TB MRI1-IU 10.98 E

Relay testing and commissioning

Checking the set values

The test instructions following below help to verify the protection relay performance before or during commissioning of the protection system. To avoid a relay damage and to ensure a correct relay operation, be sure that: the auxiliary power supply rating corresponds to the auxiliary voltage on site. the rated current and rated voltage of the relay correspond to the plant data on site. the current transformer circuits and voltage transformer circuits are connected to the relay correctly. all signal circuits and output relay circuits are connected correctly.
By repeatedly pressing the push button <SELECT>, all relay set values may be checked. Set value modification can be done with the push button <+><-> and <ENTER>. For detailed information about that, please refer to chapter 5. For a correct relay operation, be sure that the frequency set value (f=50/60) has been selected according to your system frequency (50 or 60 Hz).

Secondary injection test

6.4.1 Test equipment Voltmeter, Ammeter with class 1 or better Auxiliary power supply with the voltage corresponding to the rated data on the type plate Single-phase current supply unit (adjustable from 0 to 4 x In) Three-phase voltage supply unit (adjustable from 0 to 1.2 x Un) Timer to measure the operating time (Accuracy class 10 ms) Switching device Test leads and tools

Power-On

NOTE! Prior to switch on the auxiliary power supply, be sure that the auxiliary supply voltage corresponds with the rated data on the type plate. Switch on the auxiliary power supply to the relay and check that the message "ISEG" appears on the display and the self supervision alarm relay (watchdog) is energised (Contact terminals D7 and E7 closed).
Testing the output relays and LEDs
NOTE! Prior to commencing this test, interrupt the trip circuit to the circuit breaker if tripping is not desired. By pressing the push button <TRIP> once, the display shows the first part of the software version of the relay (e.g. D08-). By pressing the push button <TRIP> twice, the display shows the second part of the software version of the relay (e.g. 4.01). The software version should be quoted in all correspondence. Pressing the <TRIP> button once more, the display shows "PSW?". Please enter the correct password to proceed with the test. The message "TRI?" will follow. Confirm this message by pressing the push button <TRIP> again. All output relays and LEDs should then be activated and the self supervision alarm relay (watchdog) be deactivated one after another with a time interval of 3 second. Thereafter, reset all output relays back to their normal positions by pressing the push button <SELECT/RESET> (about 3 s).

6.4.2 Example of test circuit for MRI1-IU relays without directional feature For testing MRI1-IU relays current and voltage input signals are required. Figure 6.1 shows an example of a test circuit connected to the MRI1-IU relay under test. For testing relays with voltage controlled feature, three phase voltages from a variable voltage source should be applied to the relay with a V-connection as shown in the diagram. The three phase voltage should be adjustable within the effective operating range of the undervoltage element and have a phase relationship apart from 120. The current inputs could be single or three phase.

Figure 6.1:

Test curcuit
6.4.3 Checking the input circuits and measured values Apply three phase rated voltage (e.g. 100 V phase to phase) to the voltage input circuits (terminals A3, A5, A7) and inject a current, which is less than the relay pickup current set values, in phase 1 (terminals B3-B4), and check the measured current on the display by pressing the push button <SELECT/RESET>. For a relay with rated current In = 5A, for example, a secondary current injection of 1A should be indicated on the display with about 0.2 (0.2 x In). The voltage will be indicated on the display in volts. The current can be also injected into the other current input circuits (Phase 2: terminals B5-B6, Phase 3: terminals B7-B8). Compare the displayed current and voltage value with the reading of the ammeter and voltmeter. The deviation must not exceed 3%. By using an RMS-metering instrument, a greater deviation may be observed if the test current contains harmonics. Because the MRI1-IU relay measures only the fundamental component of the input signals, the harmonics will be rejected by the internal DFFT-digital filter. Whereas the RMS-metering instrument measures the RMS-value of the input signals.
6.4.4 Checking the operating and resetting values of the relay under normal and low voltage Apply three phase voltages 5% above the undervoltage set value and inject a current which is less than the relay low set current at low voltage condition in phase 1 of the relay. Gradually increase the current until the relay starts, i.e. at the moment when the LED I> and L1 light up or the alarm output relay I> is activated. Read the operating current indicated by the ammeter. The deviation must not exceed 5% of the pickup current at nominal voltage condition. Furthermore, gradually decrease the current until the relay resets, i.e. the alarm output relay I> is disengaged. Check that the resetting current is smaller than 0.97 times the operating current. Apply three phase voltages 5% below the undervoltage set value. Do the same test as above mentioned and check the relay operating current value and resetting value at low voltage condition. Repeat the test on phase 2, phase 3 in the same manner.

6.4.6 Checking the high set element of the relay Set a current above the set operating value of I>>. Inject the current instantaneously and check that the alarm output relay I>> (contact terminals D5/E5) operates. Check the tripping time of the high set element according chapter 6.4.5. Check the accuracy of the operating current setting by gradually increasing the injected current until the I>> element picks up. Read the current value form the ammeter and compare with the desired setting. Repeat the entire test on other phases in the same manner. Note ! Where test currents >4 x IN are used, the thermal withstand capability of the current paths has to be considered (see technical data, chapter 7.1).
6.4.7 Checking the external blocking and reset functions 6.4.5 Checking the relay operating time The external blocking input inhibits e. g. the function of the high set element of the phase current. To test the blocking function apply auxiliary supply voltage to the external blocking input of the relay (terminals E8/D8). The time delay tI> should be set to EXIT for this test. Inject a test current which could cause a high set (I>>) tripping. Observe that there is no trip and alarm for the high set element. Remove the auxiliary supply voltage from the blocking input. Inject a test current to trip the relay (message TRIP on the display). Interrupt the test current and apply auxiliary supply voltage to the external reset input of the relay (terminals C8/D8). The display and LED indications should be reset immediately.
To check the relay operating time, a timer must be connected to the trip output relay contact. The timer should be started simultaneously with the current injection in the current input circuit and stopped by the trip relay contact. Set the current to a value corresponding to twice the operating value and inject the current instantaneously. The operating time measured by the timer should have a deviation of less than 3% of the set value or 10 ms (DEFT). Accuracy for inverse time characteristics refer to IEC 255-3. Repeat the test on the other phases or with the inverse time characteristics in the similar manner. In case of inverse time characteristics the injected current should be selected according to the characteristic curve, e.g. two times IS. The tripping time may be red from the characteristic curve diagram or calculated with the equations given under "technical data". Please observe that during the secondary injection test the test current must be very stable, not deviating more than 1%. Otherwise the test results may be wrong.

Technical data

Measuring input circuits Nominal current IN Nominal voltage UN Nominal frequency fN at IN = 1 A at IN = 5 A < 1 VA 1A or 5A 100 V, 230 V, 400 V 50 Hz; 60 Hz adjustable 0.2 VA 0.1 VA

Rated data:

Power consumption in current circuit: Power consumption in voltage circuit: Thermal withstand capability in current circuit:
dynamic current withstand (half-wave) 250 x for 1 s 100 x for 10 s 30 x continuously 4x

IN IN IN IN

Thermal withstand in voltage circuit:

continuously

1.5 x UN
Common data > 97 % 30 ms 10 ms 30 ms 5%
Dropout to pickup ratio: Returning time: Time lag error class index E: Minimum operating time: Transient overreach at instantaneous operation:

Setting ranges and steps

7.3.1 Definite time overcurrent protection relay Setting range 0.2.4.0 x IN 0.03 - 260 s 1.40 x IN 0.03.2 s UN = 100 V: 10 - 110 V UN = 230 V: 20 - 250 V UN = 400 V: 40 - 440 V Step 0.05; 0.1 x IN 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1.0; 2.0; 5.0 s 0.1; 0.2; 0.5; 1.0 x IN 0.01 s; 0.02 s; 0.05 s 5V 10 V 20 V Tolerance 3 % from set value or min. 1 % In 3 % or 10 ms 3 % from set value or min. 1 % In 3 % or 10 ms 5 % from set value
ISN; ISL tI> I>>N I>>L tI>> U
7.3.2 Inverse time overcurrent protection relay According to IEC 255-4 or BS 142 Normal Inverse t= I Is Very Inverse t= 014 , 0,02 t > [ s] I 1
, 135 t > [ s] I I 1 Is 80 t > [ s] I 2 I 1 Is

Extremely Inverse

Where:

t tI> I Is

= = = =
tripping time time multiplier fault current Starting current Step 0.05; 0.1 x IN 0.01; 0.02 Tolerance 3 % from set value or min. 1 % In 5 % for NINV and VINV 7.5 % for NINV and EINV 3 % from set value or min. 1 % In 3 % or 10 ms 5 % from set value

ISN; ISL tI>

Setting range 0.2.4.0 x IN 0.05 - 10
I>>N I>>L tI>> U
1.40 x IN 0.03.2 s UN = 100 V: 10 - 110 V UN = 230 V: 20 - 250 V UN = 400 V: 40 - 440 V

0.1; 0.2; 0.5; 1.0 x IN 0.01 s; 0.02 s; 0.05 s 5V 10 V 20 V
Inverse time characteristics

tI>= t[s]

10.0 8.0 6.0

t[s] 10

tI>=

10.0 8.0 6.0 4.0 3.0

4.0 3.0 2.0 1.4 1.0 0.8 0.6 0.5 0.4 0.3 0.2
2.0 1.4 1.0 0.8 0.6 0.5 0.4 0.3 0.2

0.1 0.05

Figure 7.1: Normal Inverse Figure 7.3:

Very Inverse

1000 100

100 10

0.02 I> 4.0

t[s] 10 tI>=

10.0 8.0 6.0 4.0 3.0 2.0 1.4 1.0 0.8 0.6 0.5 0.4 0.3 0.2 0.05 0.1

260 tI>

0.03 1.0 I>> 40 2.0 tI>>

0.10 20

Figure 7.2: Extremely Inverse Figure 7.4
Definite time overcurrent relay
Output contacts dependent on relay type 2 change-over contacts for trip relay 1 change-over contact for alarm relays
Number of relays: Contacts:
Technical data subject to change without notice!

Order form

MRI1I1 I5 U1 U2 U4 A D
Voltage controlled time overcurrent relay
3-phase current I>, I>> Rated current 1A 5A
Voltage dependent tripping characteristic Rated voltage 100 V 230 V 400 V Housing (12TE) 19-rack Flush mounting
Setting of code jumpers Code jumper J1 J2 J3
Default setting Actual setting Default setting Actual setting Default setting Actual setting Plugged Not plugged X no function X
Assignment of the output relays: Function Relay 1 Default setting I> alarm I> tripping I>> alarm I>> tripping X X X Actual setting Relay 2 Default setting X Actual setting Relay 3 Default setting Actual setting Relay 4 Default setting Actual setting
Assignment of the blocking function: Default setting Not blocking X Actual setting Not blocking

Function I> I>>

Blocking X

Blocking

Setting list MRI1
Note ! All settings must be checked at site and should the occasion arise, adjusted to the object/item to be protected. Project: Function group: = Relay functions: Location: + SEG job.-no.: Relay code: Password: Date: Setting of the parameters Default Function I>SNormal I>SLow CHAR I> tI> tI> tI> Reset I>>SNormal I>>SLow tI>> U Low set current at nominal voltage Low set current at low voltage Tripping characteristics Time delay at independent time Time multiflier at dependent time characteristics Reset Modus for dependent time characteristics High set current at nominal voltage High set current at low voltage Time delay Threshold value for undervoltage setting Rated frequency RS Slave address x In x In s V Hz 1.0 1.0 0.03 10V/20V/40V * s Unit x In x In settings 0.2 0.2 DEFT 0.03 Actual settings
All settings must be checked at site and should the occarision arise, adjusted to the object/item to be protected. * thresholds dependent on rated voltage 100 V / 230 V / 400 V

Woodward SEG GmbH & Co. KG Krefelder Weg 47 D 47906 Kempen (Germany) Postfach 55 (P.O.Box) D 47884 Kempen (Germany) Phone: +49 (0) Internet Homepage http://www.woodward-seg.com Documentation http://doc.seg-pp.com Sales Phone: +49 (0) Telefax: +49 (0) e-mail: kemp.electronics@woodward.com Service Phone: +49 (0) Telefax: +49 (0) e-mail: kemp.pd@woodward.com

doc1

MRI1-IN - Sensitive directional time overcurrent relay
Contents 3 Introduction and application Features and characteristics Design 3.1 Connections 3.1.1 Analog input circuits 3.1.2 Output relays 3.1.3 Blocking input 3.1.4 External reset input 3.2 Front plate Working principle 4.1 Analog circuits 4.2 Digital circuits 4.3 Directional feature 4.4 Demand imposed on the main current transformers Operation and setting 5.1 Display and LEDs 5.1.1 Display 5.1.2 LEDs 5.2 Setting procedure 5.2.1 Pickup value for the sensitive overcurrent element (I>1) 5.2.2 Trip delay for the sensitive overcurrent element (tI>1F/B) 5.2.3 Pickup value for the standard overcurrent element (I>2) 5.2.4 Time current characteristics for phase overcurrent element (CHAR) 5.2.5 Reset setting for inverse time tripping characteristics in the phase current path 5.2.6 Trip delay or time factor for the standard overcurrent element (tI>2F/B) 5.2.7 Current setting for high set element (I>>) 5.2.8 Trip delay for high set element (tI>>F/B) 5.2.9 Undervoltage release (U<) of the overcurrent supervision (I>2) 5.2.10 Characteristic angle () 5.2.11 NOWA/WBAK- adjustment 5.2.12 Dwell time 5.2.13 5.2.14 5.3 5.4 5.5 5.5.1 5.5.2 5.5.Relay 6.1 6.2 6.3 6.4 6.4.1 6.4.2 6.4.3 6.4.4 6.4.5 6.4.6 6.4.7 6.5 6.Nominal frequency (fN) Adjustment of the slave address Measured value indication Reset Setting value calculation Sensitive definite time overcurrent protection Definite time overcurrent element Inverse time overcurrent element testing and commissioning Power-On Testing the output relays and LEDs Checking the set values Secondary injection test Test equipment Test circuit Checking the input circuits and measured values Checking the operating and resetting values of the relay Checking the relay operating time Checking the high set element of the relay Checking the external blocking and reset functions Primary injection test Maintenance
Technical data 7.1 Measuring input circuits 7.2 Common data 7.3 Setting ranges and steps 7.3.1 Time overcurrent protection 7.3.2 Inverse time overcurrent protection relay 7.3.3 Direction unit 7.4 Inverse time characteristics Order form
Important: For additional common data of all MR-relays please refer to manual MR - Digital Multifunctional relays.
This manual is valid for relay software version from D19_1.00 onwards

TB MRI1-IN 02.97 E

Introduction and application
Features and characteristics
The sensitive time overcurrent relay MRI1-IN with directional features is mainly used for system decoupling where generators operating in parallel with high impedance grids. With very high impedance grids (where load changes cause big voltage changes) vector surge relays or df/dt relays cannot be used for mains decoupling because even insignificant load changes (load connection or disconnetion) can cause vector surges or frequency changes (df/dt) in the local grid and so result in unintended mains decoupling. For many industrial grids with local power generators, feedback into the grid of the Electrical Utility Company during parallel operation is not wanted because such feedback into the public grid can jeopardize a secure local power supply during mains failures. The MRI1-IN with its very accurate setting range detects even minimal current imports from the system during feedback into the public grid. The MRI1-IN is additionally provided with two overcurrent elements, a high set element as well as a characteristic angle element which can be adjusted continuously. So the MRI1-IN can be used in all meshed systems and doubly infeeded lines as normal directional time overcurrent protection. Its functions are as follows: Definite time overcurrent protection (UMZ) Inverse time overcurrent protection (AMZ) with selectable tripping characteristic Furthermore, the relay can be employed as a back-up protection for distance and differential protective relays.
Digital filtering of the measured values by using discrete Fourier analysis to suppress the high frequence harmonics and DC components induced by faults or system operations Selectable protective functions between: definite time overcurrent relay and inverse time overcurrent relay Selectable inverse time characteristics according to BS 142 and IEC 255-4: Normal Inverse Very Inverse Extremely Inverse Reset setting for inverse time characteristics selectable High set overcurrent unit with instantaneous or definite time function. Two element time ovcercurrent relay for phase faults Directional feature for application to the doubly infeeded lines or meshed systems. Measuring the phase current during short-curcuit free operation, storage of the trip values in case of failure Extremely accurate current setting range I>1: 0.5% to 25% IN (used as mains decoupling against feeding back into the grid). I>2: 50% to 200% IN (used as normal time overcurrent protection with directional features) Three directional elements with different tripping times for both directions Withdrawable modules with automatic short circuit of C.T. inputs when the modules are withdrawn. External blocking function Characteristic angle with directional features, adjustable from 0 to 355 Adjustable dwell time Overcurrent element I>2, selectable either with or without undervoltage supervision

Design

Connections

Figure 3.1: Anschlubild

3.1.1 Analog input circuits The protection unit receives the analog input signals of the phase currents IL1 (B3-B4), IL2 (B5-B6), IL3 B7-B8 and phase voltages U1 (A3), U2 (A5), U3 (A7) each via separate input transformers. The phase voltages can be applied in V-connection alternatively according to Figure 3.2. The constantly detected current and voltage measuring values are galvanically decoupled, filtered and finally fed to the analog/digital converter.

Figure 3.2:

Voltage transformer in V-connection for the directional detection at overcurrent and short-circuit protection.
3.1.2 Output relays The MRI1-IN has five output relays. One output relay with two change-over contacts is employed for tripping, the other relays each with one change-over contact for alarm. Tripping output relay C1, D1, E1, C2, D2, E2 Low set overcurrent alarm relay (I>) C4, D4, E4 High set overcurrent alarm relay (I>>) C5, D5, E5 Directional detection C6, D6, E6 Self-supervision alarm relay C7, D7, E7

Front plate

All trip and alarm relays are working current relays, the relay for self supervision is an idle current relay.
3.1.3 Blocking input By applying the aux. voltage to D8/E8 all trip functions are blocked. Pickup and directional features are still indicated by LEDs. The alarm relays will not be blocked.
3.1.4 External reset input See chapter 5.4
Figure 3.3: Frontplatte MRI1-IN
All LEDs are two-coloured. LEDs left to the alphanumerical display light-up green during measuring and red at an alarm. LEDs U and I are used for measuring and light up green. LEDs underneath the push button <SELECT/RESET> light-up green during setting and inquiry of the setting values printed left to the LEDs. They light-up red when the setting values printed at the right to the LEDs are activated. The LED marked with letters RS lights up yellow during setting of the slave address for serial data communication.

Working principle

Analog circuits

Directional feature

The incoming currents from the main current transformers on the protected object are converted to voltage signals in proportion to the currents via the input transformers and burden. The noise signals caused by inductive and capacitive coupling are supressed by an analog R-C filter circuit. The analog voltage signals are fed to the A/Dconverter of the microprocessor and transformed to digital signals through Sample- and Hold-circuits. The analog signals are sampled at 50 Hz (60 Hz) with a sampling frequency of 800 Hz (960 Hz), namely, a sampling rate of 1.25 ms (1.04 ms) for every measuring quantity.
A built-in directional element in MRI1 is available for application to doubly infeeded lines or to ring networks. The measuring principle for determining the direction is based on phase angle measurement and therefore also on coincidence time measurement between current and voltage. Since the necessary phase voltage for determining the direction is frequently not available in the event of a fault, whichever line-to-line voltage follows the faulty phase by 90 is used as the reference voltage for the phase current. The characteristic angle at which the greatest measuring sensitivity is achieved can be set to precede the reference voltage in the range from 0 to 355. The TRIP region of the directional element is determined by rotating the phasor on the maximum sensitivity angle for 90, so that a reliable direction decision can be achieved in all faulty cases.

Digital circuits

The essential part of the MRI1 relay is a powerful microcontroller. All of the operations, from the analog digital conversion to the relay trip decision, are carried out by the microcontroller digitally. The relay program is located in an EPROM (Electrically-ProgrammableRead-Only-Memory). With this program the CPU of the microcontroller calculates the three phase currents and ground current in order to detect a possible fault situation in the protected object. For the calculation of the current value an efficient digital filter based on the Fourier Transformation (DFFT Discrete Fast Fourier Transformation) is applied to suppress high frequency harmonics and DC components caused by fault-induced transients or other system disturbances. The calculated actual current values are compared with the relay settings. If a phase current exceeds the pickup value, an alarm is given and after the set trip delay has elapsed, the corresponding trip relay is activated. The relay setting values for all parameters are stored in a parameter memory (EEPROM - Electrically Erasable Programmable Read-only Memory), so that the actual relay settings cannot be lost, even if the power supply is interrupted. The microprocessor is supervised by a built-in "watchdog" timer. In case of a failure the watchdog timer resets the microprocessor and gives an alarm si-gnal, via the output relay "self supervision".

Figure 4.1:

TRIP/NO-TRIP region for directional element in MRI1-IN (directional measuring in phase 1)
By means of accurate hardware design and by using an efficient directional algorithm a high sensitivity for the voltage sensing circuit and a high accuracy for phase angle measurement are achieved so that a correct directional decision can be made even by close three-phase faults. As an addition, to avoid maloperations due to disturbances, at least two periods (40 ms at 50 Hz) are evaluated.

I a I> Imin.

& (B) &

& (F)

S w itchin g ov e r to d ire ctio n w ith m ax. c u rre n t
to I> 1 , I>2 , I> >-m e a surin g

I> Imin.

U> Umin
I a I> Imin. & (B) (F) (fo rw a rd d ire ctio n )
to I> 1 , I> 2 , I>> -m e a surin g
to I> >-m e a surin g (trip re le a se in fo rw a rd d irec tio n a t 3xU =0 )
Figure 4.2: Block diagram direction detection
4.4 Die Megren I und U mssen mindestens im Bereich der unteren Einstellgrenzen des Gertes liegen, damit eine zuverlssige Messung erfolgen kann. Sind diese Kriterien erfllt, so erfolgt die Richtungsentscheidung ber die Auswertung des Winkels zwischen Strom und Spannung, wobei die Phase mit dem hchsten Strom ausschlaggebend ist. Ist die Phasenspannung bei einem nahen Kurzschlu zu gering, wird die Kurzschlustufe auf Vorwrtsfehler umgeschaltet.
Demand imposed on the main current transformers
The current transformers have to be rated in such a way, that a saturation should not occur within the following operating current ranges: Independent time overcurrent function: K1 = 2 Inverse time overcurrent function: K1 = 20 High-set function: K1 = 1.2 - 1.5 K1 = Current factor related to set value Moreover, the current transformers have to be rated according to the maximum expected short circuit current in the network or in the protected objects. The low power consumption in the current circuit of MRI1-IN, namely <0,2 VA, has a positive effect on the selection of current transformers. It implies that, if an electromechanical relay is replaced by MRI1-IN, a high accuracy limit factor is automatically obtained by using the same current transformer.

Operation and setting

Display and LEDs
5.1.1 Display Function Normal operation: Measured operating values: Voltage U12, U23, U31 Currents IL1, IL2, IL3 Phase angel 1, 2, 3 Measuring range overflow Setting values: Display shows SEG actual current measured values related to IN; Voltages in volt and angle in max. Current and time settings DEFT/NINV/VINV/ EINV 0s / 60s RCA in degree () Voltage in volt NOWA WBAK f = 50 / f = 60 auto / 200 EXIT 1-32 Tripping currents and other fault data SAV? SAV! First part (e.g D01-) Sec. part (e.g. 8.00) TRI? PSW? TRIP XXXX SEG Pressed pushbutton Corresponding LED I ,U ,, L1, L2, L3

Anyone of these four characteristics can be chosen by using <+> <->-pushbuttons, and can be stored by using <ENTER>-pushbutton.
5.2.5 Reset setting for inverse time tripping characteristics in the phase current path (tRST) To ensure quick tripping, even with recurring fault pulses shorter than the set trip delay, the reset mode for inverse time tripping characteristics can be switched over. If the adjustment tRST is set at 60s, the tripping time is only reset after 60s faultless condition. This function is not available if tRST is set to 0. With fault current break the trip delay is reset immediately and started again at recurring fault current.
5.2.2 Trip delay for the sensitive overcurrent element (tI>1F/B) The trip delay for the sensitive overcurrent element I>1 can be adjusted in the time range 0.1 - 260 s separately for forward and backward faults. tI>1F - trip delay for forward faults tI>1B - trip delay for backward faults If tripping for backward faults is not requested, it can be blocked by adjusting the trip delay tI>1B to EXIT.
5.2.3 Pick-up value for the standard overcurrent element (I>2) The standard overcurrent element (I>2) can be adjusted from 0.5 - 2 x IN.
5.2.6 Trip delay or time factor for the standard overcurrent element (tI>2F/B) The trip delay for the standard overcurrent element can be adjusted in the time range 0.1 - 260 s separately for forward and backward faults (definite time tripping characteristic). For the inverse tripping characteristic the adjustment range for forward and backward faults tI> is 0.07 - 20. The wide setting range of the time factor tI> up to 20 makes setting of long-term tripping characteristics possible. If the trip delay for backward faults is set longer than the one for forward faults, the protective relay works as a "backup"-relay for the other lines on the same busbar. This means that the relay can clear a fault in the backward direction with a longer time delay in case of refusal of the relay or the circuit breaker on the faulted line. In order to avoid an unsuitable arrangement of relay modes due to carelessness of the operator, the following precautions are taken: After change of the trip characteristic, LEDs for trip delay and time multiplier setting (tl>2F/B) light up. This warning signal indicates to the operator that he has to adjust the trip delay or time multiplier to the changed operational mode or trip characteristic. The LEDs keep flashing until the trip delay or time multiplier have been readjusted. If readjustment has not been done within 5 minutes (time allowed for setting of parameters), trip delay and time factor are set automatically to the lowest pickup value (shortest possible trip delay) by the processor. When setting the trip characteristic to "Definite Time", the definite time is shown as seconds on the display (e.g. 0.35 = 0.35s). This indication can be changed step-by-step with keys <+><->. When setting to inverse time, the time factor is displayed. This too can be changed step-by-step with keys <+><->. If the trip delay or time factor is set to infinity (on the display "EXIT" is shown), tripping of relay element I>2F or I>2B is blocked, but the WARN relay remains activated. By setting the trip delay, the actual set value for forward faults appears on the display first and the LED under the arrows is alight green. It can be changed with push button <+> <-> and then stored with push button <ENTER>. After that, the actual trip delay (or time multiplier) for backward faults appears on the display by pressing push button <SELECT/RESET> and the LED under the arrows is alight red. Usually this set value should be set longer than the one for forward faults, so that the relay obtains its selectivity during forward faults. If the time delays are set equally for both forward and backward faults, the relay trips in both cases with the same time delay, namely without directional feature. If the time delay for backward faults is set out of range ("EXIT" on the display) and additional"NOWA" is adjusted the relay does not trip at backward faults, namely, the relay is blocked for backward faults.

Note: When selecting dependent tripping characteristics at relays with directional phase current detection, attention must be paid that a clear directional detection will be assured only after expiry of 40 ms.
5.2.7 Current setting for high set element (I>>) The current setting value of this parameter appearing on the display is related to the nominal current of the relay This means: I>> = displayed value x IN. The high set element I>> can be adjusted form 0.5 - 16 x IN. When the current setting for high set element is set out of range (on display appears "EXIT"), the high set element of the overcurrent relay is blocked. The high set element can be blocked via terminals E8/D8 (refer to connection diagram).
5.2.11 NOWA/WBAK- adjustment There is possibility to inhibit the alarm relay in case of a fault in reverse direction. With pushbutton <SELECT> the corresponding menu point is reached. The display shows either the character "NOWA" - no alarm when afault occurs in reverse direction or "WBAK" - alarm relay is energized when a fault occurs in reverse direction. The setting is accomplished by pressing pushbuttons <+> or <-> and is stored with <ENTER>.
5.2.12 Dwell time To prevent that the C.B. trip coil circuit is interrupted by the MRI1-IN first, i.e. before interruption by the C.B. auxiliary contact, the dwell time can be set by parameter tTRIP = 200. This setting ensures that the MRI1-IN remains in self holding for 200ms after the fault current is interrupted. If tTRIP is set to AUTO, the trip element of the MRI1-IN is reset immediately after the fault current is switched off (Provided that coding is accordingly; see chapter 4.2 in technical description MR - Digital Multifunctional Relays).
5.2.8 Trip delay for high set element (tI>>F/B) The trip delay for the high set element I>> is always independent. On the display a time value (seconds) is shown. The setting procedure for forward and backward fault outlined under 5.2.6 does also apply for the trip delay of the high set element.

5.2.9 Undervoltage release (U<) of the overcurrent supervision (I>2) When directional overcurrent relays are used for mains decoupling not only an information on overcurrent and load flow direction is requested but also on undervoltage so that uncritical load flow changes and severe system failures can be considered differently. To realize this, the overcurrent element I>2 can be combined with release of the undervoltage U<. The overcurrent element I>2 trips only if at least one of the three voltages are below the set undervoltage release value U<. If undervoltage relase is not needed, it can be blocked by EXIT.
5.2.13 Nominal frequency (fN) The adapted FFT-algorithm requires the nominal frequency as a parameter for correct digital sampling and filtering of the input currents. By pressing <SELECT> the display shows "f=50" or "f=60". The desired nominal frequency can be adjusted by <+> or <-> and then stored with <ENTER>.
5.2.14 Adjustment of the slave address By pressing <SELECT/RESET> the display shows the slave address. LED "RS" lights up. The slave address can be adjusted from 1 - 32 by push buttons <+> and <>.
5.2.10 Characteristic angle () The characteristical angle for directional determination can be set in a range from 0 - 355 by parameter , advancing the respective reference voltage. (See chapter 4.3).
Measured value indication
5.5.2 Definite time overcurrent element Low set element (I>2) The pickup current setting is determined by the load capacity of the protected object and by the smallest fault current within the operating range. The pickup current is usually selected about 20% for power lines, about 50% for transformers and motors above the maximum expected load currents. The delay of the trip signal is selected with consideration to the demand on the selectivity according to system time grading and overload capacity of the protected object. High set element I>> The high set element is normally set to act for near-by faults. A very good protective reach can be achieved if the impedance of the protected object results in a well-defined fault current. In case of a line-transformer combination the setting values of the high set element can even be set for the fault inside the transformer. The time delay for high set element is always independent to the fault current.

6.4.6 Checking the high set element of the relay Set a current above the set operating value of I>>. Inject the current instantaneously and check that the alarm output relay I>> (contact terminals D5/E5) operates. Check the tripping time of the high set element according 6.4.5. Check the accuracy of the operating current setting by gradually increasing the injected current until the I>> element picks up. Read the current value form the ammeter and compare with the desired setting. Repeat the entire test on other phases and earth current input circuits in the same manner. Note ! Where test currents >4 x IN are used, the thermal withstand capability of the current paths has to be considered (see technical data, chapter 7.1).
6.4.4 Checking the operating and resetting values of the relay Inject a current which is less than the relay set values in phase 1 of the relay and gradually increase the current until the relay starts, i.e. at the moment when the LED I> and L1 light up or the alarm output relay I> is activated as well as to apply an equivalent reference voltage. The current in trip direction is only increased until the relay is energized. Read the operating current indicated by the ammeter. The deviation must not exceed 5% of the set operating value.
6.4.7 Checking the external blocking and reset functions The external blocking input inhibits the function of the high set element of the phase current. To test the blocking function apply auxiliary supply voltage to the external blocking input of the relay (terminals E8/D8). Thereafter a current has to be injected which normally causes the protection functions to trip (e.g. I>1). At the time the associated alarm relay energizes, the trip relay must not trip. Remove the auxiliary supply voltage from the blocking input. Inject a test current to trip the relay (message TRIP on the display). Interrupt the test current and apply auxiliary supply voltage to the external reset input of the relay (terminals C8/D8). The display and LED indications should be reset immediately.

Maintenance

Maintenance testing is generally done on site at regular intervals. These intervals vary among users depending on many factors: e.g. the type of protective relays employed; the importance of the primary equipment being protected; the user's past experience with the relay, etc. For electromechanical or static relays, maintenance testing will be performed at least once a year according to the experiences. For digital relays like MRI1-IN, this interval can be substantially longer. This is because: the MRI1-IN relays are equipped with very wide self-supervision functions, so that many faults in the relay can be detected and signalized during service. Important: The self-supervision output relay must be connected to a central alarm panel! the combined measuring functions of MRI1-IN relays enable supervision the relay functions during service. the combined TRIP test function of the MRI1-IN relay allows to test the relay output circuits. A testing interval of two years for maintenance will, therefore, be recommended. During a maintenance test, the relay functions including the operating values and relay tripping characteristics as well as the operating times should be tested.

Primary injection test

Generally, a primary injection test could be carried out in the similar manner as the secondary injection test described above. With the difference that the protected power system should be, in this case, connected to the installed relays under test on line, and the test currents and voltages should be injected to the relay through the current and voltage transformers with the primary side energized. Since the cost and potential hazards are very high for such a test, primary injection tests are usually limited to very important protective relays in the power system. Because of its powerful combined indicating and measuring functions, the MRI1-IN relay may be tested in the manner of a primary injection test without extra expenditure and time consumption. At the MRI1-IN it is also possible to display the voltages and individual impedance angles.

Technical data

Measuring input circuits Nominal current IN Nominal voltage UN Nominal frequency fN at IN = 1 A at IN = 5 A <1 VA 1A or 5A 100 V, 230 V, 400 V 50/60 Hz adjustable <0.12 VA <0.12 VA

Rated data:

Power consumption in: current circuit Power consumption in voltage circuit: Thermal withstand capability in current circuit:
dynamic current withstand (half-wave) 250 x IN for 1 s 100 x IN for 10 s 30 x IN continuously 4 x IN continuously 1.5 x UN
Thermal withstand in voltage circuit:
Common data > 97 % 50 ms 10 ms 60 ms 5%
Dropout to pickup ratio: Returning time: Time lag error class index E: Minimum operating time: Transient overreach at instantaneous operation:

Influences on the current measurement Auxiliary voltage: in the range of 0.8 < UH / UHN < 1.2 no additional influences can be measured in the range of 0.9 < f / fN < 1.1; < 0.2 % / Hz up to 20 % of the third harmonics; < 0.08 % per percent of the third harmonic up to 20 % of the fifth harmonic; < 0.07 % per percent of the fifth harmonic no additional influences can be measured

Frequency: Harmonics:

Influences on delay time:

Setting ranges and steps

7.3.1 Time overcurrent protection Function Overcurrent 1 (sensitive) Parameter I>1 tI>1F tI>1B Overcurrent 2 (normal) I>2 CHAR Setting range 0.5%.25% IN 0.1.260s 0.1.260s 50%.200% IN DEFT; NINV VINV; EINV 0.02s; 0.05s; 0.1s; 0.2s; 3% or 20ms 0.5s; 1s; 2s; 5s; 10s; 20s 0.01; 0.02; 0.05; 0.1; 0.2; 0.5 0.02; 0.05; 0.1; 0.2; 0.5 x In 0.02; 0.05; 0.1s 1V 2V 5V 5% from set value 3% or 20ms 5% from set value Step 0.1%; 0.2%; 0.5%; 1% Tolerance 5% from set value or 0,2% x In
0.02s; 0.05s; 0.1s; 0.2s; 3% or 20ms 0.5s; 1s; 2s; 5s; 10s; 20s 2%; 5% 5% from set value or 0,2% x In
tI>2F; tI>2B 0.1.260s (DEFT) 0.07.20 (Inverse time) High set element I>> tI>> Undervoltage U< 0,5.16xIN 0.1.2.0s Un=100V: 2.150V Un=230V: 2.340V Un=400V: 5.600V (EXIT= no undervoltage release) 0.355 (I lags before URef ) NOWA WBAK 0 s / 60 s auto/200 50/60Hz
Characteristic angle Blocking at backward faults Reset-Mode Dwell time Rated frequency NOWA tRST tTRIP fN
Table 7.1:Setting ranges and graduation
7.3.2 Inverse time overcurrent protection relay According to IEC 255-4 or BS 142 Normal Inverse t= I Is Very Inverse t=. 014 0.02 t > [ s] I
135. t > [ s] I I 1 Is 80 t > [ s] I 2 I 1 Is = = = = tripping time time multiplier fault current Starting current

Extremely Inverse

Where:

t tI> I Is

7.3.3 Direction unit Circuit: 90 Characteristic angle : 0 - 355 Pickup limit of the directional elements: 90 theoretical pickup limit: 3 der theoretischen Ansprechgrenze Tolerance of the pick-up limit: Returning angle of the pickup limit at rated voltage and current: <3 Sensitivity: At measuring voltages >0.35 % UN and currents > setting value, a forward fault can be identified at the characteristical angle. Stability of the directional decision: At measuring voltages <0.35 % UN all directional elements are blocked and the high set element I>> trips when the set value in forward direction is exceeded.

Technical data subject to change without notice!
Inverse time characteristics

tI>=

20.0 10.0 8.0 6.0

tI>= t[s] 10

20.0 10.0 8.0 6.0 4.0 3.0
4.0 3.0 2.0 1.4 1.0 0.8 0.6 0.5 0.4 0.3 0.2 0.1
2.0 1.4 1.0 0.8 0.6 0.5 0.4 0.3 0.2

0.10 20

I>2/IS
Figure 7.1: Normal Inverse I>2/IS Figure 7.3:

Very Inverse I>2/IS

I>1 I>2

0.25 2.0

20.0 10.0 8.0 6.0 4.0 3.0 2.0 1.4 1.0 0.8 0.6 0.5 0.4 0.3 0.2 0.1

260 tI>

0.1 0.5 I>> 16 2.0 tI>>
Figure 7.2: Extremely Inverse I>2/IS Figure 7.4:
Definite time overcurrent relay
NINV, VINV and EINV apply for I>2 settings, DEFT for all elements (I>1, I>2 and I>>)

Order form

Sensitive directional time overcurrent relay
3-phase measuring I>, I>> Rated current
1A 5A Sensitive directional feature for mains decoupling Rated voltage 100 V 230 V 400 V 19-rack Flush mounting

Housing (12TE)

Setting list MRI1-IN
Note ! All settings must be checked at site and should the occasion arise, adjusted to the obect/item to be protected. Project: Function group: = Relay function: Location: + SEG job.-no.: Relay code: Password: Date:
Setting of parameters Actual settings
Function I>1 tI>1F tI>1B I>2 Pickup value for sensitive overcurrent element Tripping delay for sensitive overcurrent element (forward direction) Tripping delay for sensitive overcurrent element (reverse direction) Pickup value for the normal overcurrent element

Unit IN s s IN

Default settings 0.005 0.1 0.1 0.5 DEFT
CHAR Tripping characteristic for the normal overcurrent element tRST tI>2F tI>2B I>> tI>>F tI>>B U< tTRIP fN RS Reset mode for definite time characteristics Time delay for normal overcurrent element (forward direction) Time delay for normal overcurrent element (reverse direction) Pickup value for high set element Tripping delay for the high set element (forward direction) Tripping delay for the high set element (reverse direction) Pickup voltage for undervoltage release at I>2 Characteristic angle Dwell time Rated frequency Slave address of serial interface s s s IN s s V ms Hz

0 0.1 0.1 0.5 0.1 0.1

150V/340V/600V*

0 AUTO 50 1

* Setting dependent from the rated voltage 100 V / 230 V / 400 V
Setting of code jumpers Code jumper J1 J2 J3
Default setting Actual setting Default setting Actual setting Default setting Actual setting Plugged Not plugged X X X
Woodward SEG GmbH & Co. KG Krefelder Weg 47 D 47906 Kempen (Germany) Postfach 55 (P.O.Box) D 47884 Kempen (Germany) Phone: +49 (0) Internet Homepage http://www.woodward-seg.com Documentation http://doc.seg-pp.com Sales Phone: +49 (0) Telefax: +49 (0) e-mail: kemp.electronics@woodward.com Service Phone: +49 (0) Telefax: +49 (0) e-mail: kemp.pd@woodward.com

 

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DVD-P380KT IC-2GA System PSR-260 L60699 S1 PRO Laserjet 8150 XBM 838 TH7II-raid 30PF9946 Multimode II Dect1211S 53 PL-Z94 Utility AG-7350E DV 8200 WF-T1402TP ED-382NP Dinovo ST-500 1 Trilogy 37PFL7603D 10 Tl32100 L350D 8FF3FPB FLS873C Silhouette Cielo KDL-32W5720 DEH-P9800BT CDX-S11S SAA7135 PM4400 WA95V3 11836 WT-5120U UE-37C5000 Series Iloa 3503 Logicom L550 S24AW S50 Makita 3620 HT-A100 Creator 90 Husqvarna 440E 50PC1DR-UA CE-200 F17C LE ICF-CD853V ECM-MS907 6 MF Ware DIY VCL-HGA07 MY521X CDX-GT410U KB 42 Deskjet 500 PD-M603 DDX8019 Casio 2608 TXL32C20E Kodak M873 RTF 1021 MP7010 FR PN-465E KX-R191 SGH-C500L Samsung 971P WD-14440FDS CDX-S2010 WIM 2030 PA4100 Street V3 BSV-1985 Programmer GLC2500L 1125 07 World XL 335 KX-TG1070SP DR265-P1 Headset T4250 Gateway Bizhub 600 Enterprise LGR435 DPF 7901 Lwhd1800R WA840G Kidizoom Plus 870 IS Review XVN422SEB-xv-n422 Reader FP733 ROC 250 RM4290 TI-30X IIS 1800MF

 

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