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Woodward MRIK3 Manual

Woodward MRIK3 Manual

Time overcurrent relay with auto reclosing relay
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MRIK3 – Time overcurrent relay
with auto reclosing relay
(August 2006)
Manual MRIK3 (Revision New)

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Summary of Contents for Woodward MRIK3

  • Page 1 MRIK3 – Time overcurrent relay with auto reclosing relay (August 2006) Manual MRIK3 (Revision New)
  • Page 2 Woodward Manual MRIK3 GB Woodward Governor Company reserves the right to update any portion of this publication at any time. Information provided by Woodward Governor Company is believed to be correct and reliable. However, no responsibility is as- sumed by Woodward Governor Company unless otherwise expressly undertaken.

  • Page 3: Table Of Contents

        3.1.3 Blocking input ......................10     3.1.4 External reset input ..................... 10     3.1.5 Output relays of MRIK3 relays ..................10     3.1.6 Fault recorder ......................11     LEDs ..........................14     3.2.1 Indication-LEDs ......................
  • Page 4 Secondary injection test ....................41     6.4.1 Test equipment ......................41     6.4.2 Example of test circuit for MRIK3 relays ..............41     6.4.3 Checking the input circuits and measured values ............42     6.4.4 Checking the operating and resetting values of the relay ..........42  ...
  • Page 5 Manual MRIK3 GB Woodward 7.3.2 Earth fault protection ....................47     7.3.3 Inverse time over current protection relay ..............48     7.3.4 Inverse time characteristics ..................49     Parameter ........................53     Design standard ......................54  ...

  • Page 6: Introduction And Application

    Statistics have shown that yet part of the faults remain after the first fast AR can be cleared with a longer 2nd AR interval. The digital multi-shot, three phase auto reclosing relay MRIK3 fulfills these requirements for use on medium voltage transmission or distribution systems, by 4-element AR with variable adjustable dead times.

  • Page 7: Features And Characteristics

    Manual MRIK3 GB Woodward 2. Features and characteristics • Digital filtering of the measured values by using discrete Fourier analysis to suppress the high frequency harmonics and DC components induced by faults or system operations, • two parameter sets, •...

  • Page 8: Design

    Woodward Manual MRIK3 GB 3. Design Connections Figure 3.1: Connections MRIK3-I TD_MRIK3_08.06_GB_Rev.New...

  • Page 9: Analog Input Circuits

    Manual MRIK3 GB Woodward Figure 3.2: Connections MRIK3-IE 3.1.1 Analog input circuits The protection unit receives the analog input signals of the phase currents I (B3-B4), I (B5-B6), B7-B8) and the current I (B1-B2), each via separate input transformers. The constantly detected current measuring values are galvanic ally decoupled, filtered and finally fed to the analog/digital converter.

  • Page 10: Ar Information Input Circuits

    Woodward Manual MRIK3 GB 3.1.2 AR Information input circuits With the aid of information inputs unit MRIK3 decides whether and when auto-reclosing may take place: Circuit breaker position (A7) With input A7 the position of C.B. can be supervised. When the circuit breaker is closed the auxiliary voltage is connected to input A7.

  • Page 11: Fault Recorder

    Manual MRIK3 GB Woodward 3.1.6 Fault recorder The MRIK3 has a fault value recorder which records the measured analog values as instantaneous values. The instantaneous values , (i are scanned at a raster of 1.25 ms (at 50 Hz) and 1.041 ms (at 60 Hz) and saved in a cyclic buffer.
  • Page 12 Woodward Manual MRIK3 GB Figure 3.4: Basic set-up of the fault recorder Each memory segment has a specified storage time which permits setting of a time prior to the trigger event. Via the interface RS485 the data can be read and processed by means of a PC with HTL/PL-Soft4.
  • Page 13 Manual MRIK3 GB Woodward Figure 3.5: Front panel MRIK3-I Figure 3.6: Front panel MRIK3-IE TD_MRIK3_08.06_GB_Rev.New...

  • Page 14: Leds

    Five pushbuttons for control and/or adjustment and up to 21 LEDs are on the front plate of unit MRIK3. The LEDs on the left side of the display indicate the status, fault messages and AR- re- sults. The function of the respective LED is indicated by the legend above the LED.

  • Page 15: Low/High Range Of Signal Inputs

    Woodward Low/High range of signal inputs The MRIK3 has a wide-range power sup-ply unit allowing to choose a suit-able supply voltage. The operating threshold of the signal inputs, how-ever, has to be defined by taking the supply voltage into account. The following two different operating thresholds can be adjusted:...

  • Page 16: Working Principle

    (16 scans per periode). Digital circuits The essential part of the MRIK3 relay is a powerful microcontroller. All of the operations, from the analog digital conversion to the relay trip decision, are carried out by the micro-controller digitally.

  • Page 17: Ar-Ready

    The results (AR successful or unsuccessful) are evaluated accordingly. 4.3.6 "AR-blocked" Unit MRIK3 changes immediately to "AR-blocked" status when an external or internal blocking signal (A2-A3) exists. No auto reclosing is possible in "AR-blocked" status. 4.3.7 "Fast Trip Mode"...

  • Page 18: Description Of The Status Transition

    Table 4.1: No status transition possible From Table 4.1 you can detect what status transitions of MRIK3 are possible. When the unit is for instance in "cycle" status (see also para. 4.3) only two status transitions are possible: •...

  • Page 19: Functional Sequence

    (C.B. must be tripped within this time). The "start conditions not fulfilled" is eva- luated and the MRIK3 is locked for the duration of the reclaim time when there is a time dif-ference between mains protection-energized and tripping, which is larger than the set "fault time". The LED tF flashes red.

  • Page 20: Unsuccessful Reclosing

    The LED AR extinguishes and the CB LED lights up. The display shows „SEG“. 4.5.7 Repeated reclosing Is the MRIK3 programmed for more than single reclosing a further dead time is started after a new “OFF-signal” from the circuit breaker has appeared. After expiration of this dead time a new reclos- ing command follows.

  • Page 21: Time Sequence Diagrams Of Mrik3

    After expiration of the dead time tD1 unit MRIK3 gives the reclosing command to the circuit breaker. If the fault still exists the protection relay trips again and the above mentioned procedure is repeated as long until either the fault was removed (here after the second reclosing) or the number of the set SHOTs is reached.

  • Page 22: The Unit Is Programmed For Two Shots, Unsuccessful Ar

    Figure 4.3: Manual closing of the C.B. to faulty lines Unit MRIK3 is in "inactive" status when the circuit breaker is switched off. When the C.B. is manual- ly closed the reclaim time is started. In case there is a faulty line the C.B. is switched off by mains protection of the relay.

  • Page 23: Unsuccessful Ar

    Manual MRIK3 GB Woodward 4.6.4 Unsuccessful AR Figure 4.4: Unsuccessful AR The sequence diagram illustrates the various possibilities of an unsuccessful AR. TD_MRIK3_08.06_GB_Rev.New...

  • Page 24: Operations And Settings

    Woodward Manual MRIK3 GB 5. Operations and settings Display Function Display shows Pressed push button Corresponding Normal operation Measured operating values Actual measured <SELECT/RESET> L1, L2, L3, E values one time for each value Measuring range overflow max. <SELECT/RESET> L1, L2, L3, E...
  • Page 25 Manual MRIK3 GB Woodward Function Display shows Pressed push button Corresponding corder TRIP Number of fault occurrences S = 2, S = 4, S = 8 <SELECT/RESET> <+><-> Display of date and time Y = 99, M = 10, D = 1, <SELECT/RESET>...

  • Page 26: Setting Procedure

    Woodward Manual MRIK3 GB Setting procedure After push button <SELECT/RESET> has been pressed, always the next measuring value is indi- cated. 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.

  • Page 27: Parameter Switch/External Triggering Of The Fault Recorder

    Manual MRIK3 GB Woodward 5.3.5 Parameter switch/external triggering of the fault recorder By means of the parameter-change-over switches it is possible to activate two different parameter sets. Switching over of the parameter sets can either be done by means of software or via the ex- ternal inputs RESET or blocking input.

  • Page 28: Parameter Protection

    Woodward Manual MRIK3 GB Parameter protection 5.4.1 Pickup current for phase over current element (I>) The setting value for this parameter that appears on the display is related to the nominal current ) of the relay. This means: pickup current (Is) = displayed value x nominal current (I ) e.g.

  • Page 29: Current Setting For High Set Element (I>>)

    Manual MRIK3 GB Woodward 5.4.5 Current setting for high set element (I>>) The current setting value of this parameter appearing on the display is related to the nominal cur- rent of the relay. This means: I>> = displayed value x I When the current setting for high set element is set out of range (on display appears "EXIT"), the...

  • Page 30: Current Setting For High Set Element Of Earth Fault Supervision (I )

    This is the time during which - after switching on (also manually) or after AR - a subsequent reclos- ing is prevented. If the number of the set shots is reached, the MRIK3 is blocked for this time after the last reclosing attempt.

  • Page 31: Block/Trip - Time

    Manual MRIK3 GB Woodward 5.4.20 Block/Trip - time The block/trip time serves for detection of a c.b. failure protection by rear interlocking. It is activated by setting the blocking input D8/E8 and by setting the parameter to TR_B. After the set block/trip time has expired, the relay can be tripped if the excitation of a protective function has been applied the delay time of which has expired and the blocking function is still active.

  • Page 32: Fault Recorder

    Woodward Manual MRIK3 GB Fault recorder The MRI3 is equipped with a fault recorder (see chapter 3.7). Three parameters can be deter- mined. 5.5.1 Number of the fault recordings The number of max. recordings requested has to be determined in advance. There is a choice of (1)* 2, (3)* 4 or (7)* 8 recordings and de-pendent on this the duration of the individual fault record- ings is defined, i.e.

  • Page 33: Additional Functions

    AR - functions Blocking of the protective functions: The MRIK3 is equipped with a blocking function that can be parameterized arbitrary. Connecting supply voltage to terminals D8/E8 blocking of those functions which were selected by the user takes place. It is possible to choose between two types of protective blocking: Blocking of the individual protection stages.
  • Page 34 Assignment of the output relays: Unit MRIK3 has five output relays. The fifth output relay, provided as permanent alarm relay for self super-vision 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 but-tons on the front plate or via serial interface RS485.
  • Page 35 Manual MRIK3 GB Woodward Relay function Output relays Display- Lighted LED indication I> alarm _ 2 _ _ I>: green tripping 1 _ _ _ : red I> I>> alarm _ 2 _ _ I>>: green tripping 1 _ _ _ : red I>>...
  • Page 36 Woodward Manual MRIK3 GB Function Protection step Display-indication corresponding LED Activation I> AR + I> + tD1 Of the 1 I>> AR + I>> + tD1 IE> AR + IE> + tD1 IE>> AR + EI>> + tD1 Function Protection step...

  • Page 37: Indication Of Measuring And Fault Values

    All faults detected by the relay are indicated on the front plate optically. For this purpose, the four LEDs (L1, L2, L3, E) and the four function LEDs (I>, I>>, IE> und IE>>) are equipped at MRIK3. If, for example an over current occurs, first the respective phase LEDs will light up. LED I> lights up at the same time.

  • Page 38: Fault Memory

    When the relay is energized or trips, all fault data and times are stored in a non-volatile memory. The MRIK3 is provided with a fault value recorder for max. 8 fault occurrences. In the event of addi- tional trippings always the oldest data set is written over.

  • Page 39: Reset

    Manual MRIK3 GB Woodward 5.10 Reset Unit MRIK3 has the following three possibilities to reset the relay: 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 •...

  • Page 40: Relay Testing And Commissioning

    Woodward Manual MRIK3 GB 6. Relay testing and commissioning The test instructions following below help to verify the protection relay performance before or dur- ing commissioning of the protection system. To avoid a relay damage and to ensure a correct relay operation, be sure that: •...

  • Page 41: Secondary Injection Test

    6.4.2 Example of test circuit for MRIK3 relays For testing MRIK3 relays only current input signals are required. Figure 6.1 shows a simple exam- ple of a single phase test circuit with adjustable current energizing the MRIK3 relay under test.

  • Page 42: Checking The Input Circuits And Measured Values

    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 MRIK3 and gradually in-crease 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>...

  • Page 43: Checking The Auto Reclosing Function

    Manual MRIK3 GB Woodward 6.4.7 Checking the auto reclosing function The auto reclosing function can only be tested by means of an auxiliary relay simulating the C.B. and a push button for manual start. In order to simplify testing, the significant settings of the devic- es and the value of the test current are provided as follows: I>...

  • Page 44: Checking The External Blocking And Reset Functions

    Woodward Manual MRIK3 GB 6.4.10 Checking the external blocking and reset functions By means of the external blocking in-put, it is possible to block all protective functions. To give an example, the blocking function of the phase current high set element is de-scribed.

  • Page 45: Injection Test

    In actual service, for example, the measured current values on the MRIK3 relay display may be compared phase by phase with the current indications of the ammeter of the switchboard to verify that the relay works and measures correctly: •...

  • Page 46: Technical Data

    Woodward Manual MRIK3 GB 7. Technical data For additional common data of all MR-relays please refer to manual "MR - Digital Multifunctional relays". Measuring input circuits Rated data: Nominal current I 1 A or 5 A Nominal frequency f 50 Hz; 60 Hz adjustable...

  • Page 47: Setting Ranges And Steps

    Manual MRIK3 GB Woodward Setting ranges and steps 7.3.1 Time overcurrent protection Setting range Step Tolerance Iprim (SEK) 0.002...50 kA 0.001; 0.002; 0.005; 0.01; 0.02; 0.05; 0.1; 0.2 I> 0.2...4.0 x I (EXIT) 0.01, 0.02, 0.05; 0.1 x I ±3% from set value or min.

  • Page 48: Inverse Time Over Current Protection Relay

    Woodward Manual MRIK3 GB 7.3.3 Inverse time over current protection relay According to IEC 255-4 or BS 142 · Normal Inverse (Type A) · Very Inverse (Type B) · Extremely Inverse (Type C) · Long Time Inverse · RI-Inverse Time 1.35 ·...

  • Page 49: Inverse Time Characteristics

    Manual MRIK3 GB Woodward 7.3.4 Inverse time characteristics 1000 I> 10.0 t[s] 0.05 5 6 7 8 910 Figure 7.1: Normal Inverse 1000 I> t[s] 10.0 0.05 5 6 7 8 910 Figure 7.2: Very Inverse TD_MRIK3_08.06_GB_Rev.New...
  • Page 50 Woodward Manual MRIK3 GB 1000 t[s] I> 10.0 0.05 0.05 0.01 5 6 7 8 910 Figure 7.3: Extremely Inverse I> 10.0 t[s] 0.05 5 6 7 8 910 Figure 7.4: RI-Inverse TD_MRIK3_08.06_GB_Rev.New...
  • Page 51 Manual MRIK3 GB Woodward 10000 1000 I> t[s] 10.0 0.05 5 6 7 8 910 Figure 7.5: Long Time Inverse I> t[s] 0.01 4 5 6 7 8 910 30 40 506070 Figure 7.6: RXIDG-characteristic TD_MRIK3_08.06_GB_Rev.New...
  • Page 52 Woodward Manual MRIK3 GB I> I> 0.02 0.02 t[s] > > 0.03 0.03 I>> I>> 40 40 >> >> 0.03 0.03 0.01 Figure 7.7: Definite time over current relay TD_MRIK3_08.06_GB_Rev.New...

  • Page 53: Parameter

    Manual MRIK3 GB Woodward Parameter AR Parameters Setting Step Tolerance range SHOT 1..4 (EXIT) ±3% or 10 ms 0,1...20 s 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1 s 0,1...20 s 0.01; 0.02; 0.05; 0.1; 0.2; 0.5; 1 s 0,1...100 s 0.01;...

  • Page 54: Design Standard

    Woodward Manual MRIK3 GB Parameters for the fault recorder Function Parameter Adjustment example Number of recordings (1)* 2 x 8 s; (3)* 4 x 4 s; (7)* 8 x 2 s (with 50 Hz) (1)* 2 x 6.66 s, (3)* 4 x 3.33 s, (7)* 8 x 1.66 s (60 Hz) Saving of the recording at the P_UP;...

  • Page 55: Order Form

    Manual MRIK3 GB Woodward 8. Order form Time overcurrent relay with AR MRIK3 3-phase measuring I>, I>> Rated current Earth current measuring Rated current in earth path Housing (12TE) 19“-rack Flush mounting RS485 Alternatively with Modbus Protocol Technical data subject to change without notice!
  • Page 56 Woodward Manual MRIK3 GB Setting list MRIK3 Project: SEG job.-no.: Function group: = Location: + Relay code: - Relay functions: Password: Date: All settings must be checked at site and should the occasion arise, adjusted to the object/item to be protected.
  • Page 57 Manual MRIK3 GB Woodward Protection parameter Function Unit Default Actual setting setting Set 1/Set Set 1 Set 2 I> Over current pickup value I> CHAR Tripping characteristic over current DEFT Over current tripping delay 0.03 I> I>/t Reset-mode I>> Pickup value for high set element tI>>...
  • Page 58 Woodward Manual MRIK3 GB Assignment of the blocking function Default setting Actual setting Parameter switch Set 1 Set 2 Set 1 Set 2 Blocking the protection function PR_B PR_B PR_B Blocking the trip step TR_B Default setting Actual setting Function...
  • Page 59 Manual MRIK3 GB Woodward Assignment of AR functions Function Default setting Actual setting Parameter switch Set 1 Set 2 Set 1 Set 2 Trip after the 1 I> TIME TIME I>> TIME TIME IE> TIME TIME IE>> TIME TIME Activation of the 1 AR per I>...
  • Page 60 Software-Versions No. D01-2.13 Modbus Versions No. D51-1.23 Woodward SEG GmbH & Co. KG Krefelder Weg 47 ⋅ D – 47906 Kempen (Germany) Postfach 10 07 55 (P.O.Box) ⋅ D – 47884 Kempen (Germany) Phone: +49 (0) 21 52 145 1 Internet Homepage http://www.woodward-seg.com...

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