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Seg MRIK3 Manual

Time overcurrent relay with auto reclosing relay
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MRIK3 - Time overcurrent relay with auto reclosing relay

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Summary of Contents for Seg MRIK3

  • Page 1 MRIK3 - Time overcurrent relay with auto reclosing relay...

  • Page 2: Table Of Contents

    5.3.1 Display of measuring values as primary 3.1.4 External reset input quantities (I phase) prim 5.3.2 Display of earth current as primary 3.1.5 Output relays of MRIK3 relays quantity (I earth) 3.1.6 Fault recorder prim LEDs 5.3.3 Nominal frequency 5.3.4 Display of the activation storage 3.2.1...
  • Page 3 Testing the output relays and LEDs Checking the set values Secondary injection test 6.4.1 Test equipment 6.4.2 Example of test circuit for MRIK3 relays 6.4.3 Checking the input circuits and measured values 6.4.4 Checking the operating and resetting values of the relay 6.4.5...

  • Page 4: Introduction And Application

    • adjustable timer for fault time, dead time, close im- The digital multi-shot, three phase auto reclosing relay pulse time and reclaim time, MRIK3 fulfills these requirements for use on medium • external blocking and blocking release of AR, voltage transmission or distribution systems, by •...

  • Page 5: Design

    Design Connections Figure 3.1: Connections MRIK3-I Figure 3.2: Connections MRIK3-IE TB MRIK3 12.00 E...

  • Page 6: Analog Input Circuits

    Please refer to chapter 5.10. 3.1.2 AR Information input circuits 3.1.5 Output relays of MRIK3 relays With the aid of information inputs unit MRIK3 decides Two relays are equipped with two change-over contacts whether and when auto-reclosing may take place: and three relays with each one change-over contact for alarm.

  • Page 7: Fault Recorder

    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. It is possible to store 1 - 8 fault occurences with a total re- cording time of 16 s (with 50 Hz) and 13.33 s (with...

  • Page 8: Leds

    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- results. The function of the re- spective LED is indicated by the legend above the LED.

  • Page 9: Low/High Range Of Signal Inputs

    Low/High range of signal inputs The MRIK3 has a wide-range power supply unit allow- ing to choose a suitable supply voltage. The operating threshold of the signal inputs, however, has to be de- fined by taking the supply voltage into account. The fol-...

  • Page 10: Working Principle

    • the unit is not in "starting/cycle" status Digital circuits 4.3.2 "Reclaim time" tR The essential part of the MRIK3 relay is a powerful mi- The relay is in "reclaim time" status (tR) when the reclaim crocontroller. All of the operations, from the analog digi-...

  • Page 11: Ar-Cycle" (Auto Reclosing)

    AR. 4.3.6 "AR-blocked" 4.3.8 Blocking mode Unit MRIK3 changes immediately to "AR-blocked" status By way of the function "Assignment of the AR functions" when an external or internal blocking signal (A2-A3) exists. No auto reclosing is possible in "AR- it is possible to activate or deactivate a protection func- tion for each AR stage.

  • Page 12: Description Of The Status Transition

    From Table 4.1 you can detect what status transitions of Is the C.B. to be supervised in OFF position while MRIK3 are possible. When the unit is for instance in “switching ON” the MRIK3, the unit changes into "inac- "cycle" status (see also para. 4.3) only two status transi- tive"...

  • Page 13: Circuit Breaker Manual Closing

    If the circuit breaker is closed manually to a faulty be programmed for reclosing of one to four times. For line (e.g. short circuit), no AR follows. Unit MRIK3 re- each reclosing a dead time has to be set (t to t mains in "inactive"...

  • Page 14: Supervision Of The Circuit Breaker Ready

    „S/E?“. 4.5.9 External blocking The AR-relay is blocked if the the external AR-block input is activated. When the reclosing shot is set to „EXIT“, the MRIK3 can also be blocked at site. (see chapter 5.4.13) TB MRIK3 12.00 E...

  • Page 15: Time Sequence Diagrams Of Mrik3

    Time sequence diagrams of MRIK3 Legend: 4.6.1 The unit is programmed for two shots, successful AR at the second shot Figure 4.1: Two shots, second AR successful In case of a short circuit an energizing follows with sub- If the fault still exists the protection relay trips again and sequent tripping of the protection relay.

  • Page 16: Unsuccessful Ar

    In case there is a faulty line the C.B. is switched off by mains protection of the relay. After elapse of the reclaim time unit MRIK3 changes over to "inactive" status. 4.6.4 Unsuccessful AR Figure 4.4: Unsuccessful AR...

  • Page 17: Operations And Settings

    Display if AR is unsuccessful 0→1 red Trigger signal for the fault recorder TEST, P_UP, A_PI, TRIP <SELECT/RESET> <+><-> Number of fault occurences S = 2, S = 4, S = 8 <SELECT/RESET> <+><-> only Modbus TB MRIK3 12.00 E...
  • Page 18 Switch-over LED flash NOFL <+><-> No LED flash Enquiry failure memory FLT1; FLT2..<-><+> Delete failure memory wait <-> <SELECT/RESET> SEG System reset <SELECT/RESET> for about 3 s Table 5.1: Possible indication messages on the display TB MRIK3 12.00 E...

  • Page 19: Setting Procedure

    "f=60". The desired nominal frequency can be adjusted put. by <+> or <-> and then stored with <ENTER>. The relevant function is then activated by applying the auxiliary voltage to one of the external inputs. TB MRIK3 12.00 E...

  • Page 20: Parameter Protection

    After press- ing the <SELECT>-push button, the present time delay setting value is shown on the display. The new setting value can then be changed by using <+> <-> -push but- tons. TB MRIK3 12.00 E...

  • Page 21: Trip Delay For High Set Element

    AR - a subsequent reclosing is pre- vented. If the number of the set shots is reached, the MRIK3 is blocked for this time after the last reclosing at- tempt. The reclaim time is started with the automatic closing command or by switching on manually.

  • Page 22: Fault Time Activation

    CBFP 0.1 - 2.0 s), the protection device diagnonses C.B. failure and the respective assigned relay is activated. The C.B. failure protection function is deactivated again, when all phase currents drop to 0 within t CBFP TB MRIK3 12.00 E...
  • Page 23 It is possible to adjust a time between 0.05 s and 8 s. With keys <+> and <-> the values can be changed and with <ENTER> be saved. TB MRIK3 12.00 E...
  • Page 24 Assignment of the output relays: vidual protection stages are excited and the set tripping time expires. Tripping only takes place Unit MRIK3 has five output relays. The fifth output relay, when: provided as permanent alarm relay for self supervision a) the voltage at the blocking input D8/E8 is re- is normally on.
  • Page 25 _ _ 3 _ CB green switch on _ _ _ 4 AR yellow + green Unsuccessful _ _ 3 _ AR yellow + O→I red Table 5.3: Example of assignment matrix of the output relay (default settings) TB MRIK3 12.00 E...
  • Page 26 TIME IE>> + tD1 tion step indication Activation I> AR + I> + tD4 of the 4 AR I>> AR + I>> + tD4 IE> AR + IE> + tD4 IE>> AR + EI>> + tD4 TB MRIK3 12.00 E...
  • Page 27 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 overcurrent occurs, first the respective phase LEDs will light up. LED I>...
  • Page 28 When the relay is energized or trips, all fault data and Value displayed Relevant LED times are stored in a non-volatile memory. The MRIK3 is Phase currents L1, L2, L3 in I/In L1, L2, L3 provided with a fault value recorder for max. 8 fault oc-...
  • Page 29 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 • The software reset has the same effect as the <SELECT/RESET>...
  • Page 30 1 second. In the same manner all LEDs are activated at 0.5 s intervals. Two-coloured LEDs always change from red to green in this process. Thereafter, reset all output relays back to their normal positions by pressing the push button <SELECT/RESET> (about 3 s). TB MRIK3 12.00 E...
  • Page 31 Inject a current which is less than the relay set values in rent set values, in phase 1 (terminals B3-B4), and check phase 1 of the relay MRIK3 and gradually increase the the measured current on the display by pressing the current until the relay starts, i.e.
  • Page 32 After the relay has tripped, the test current should be switched off as quickly as possible. Otherwise, there is the danger that the switch failure protection device CBFP picks up. If switching off quickly is impossible, tCBFP must be set to "EXIT". TB MRIK3 12.00 E...
  • Page 33 „TRIP“ on the display). Interrupt the test current and ap- to be subtracted from the total tripping time measured. ply auxiliary supply voltage to the external reset input of the relay (terminals C8/D8). The display and LED indi- cations should be reset immediately. TB MRIK3 12.00 E...
  • Page 34 MRIK3 relay display may be compared enable supervision the relay functions during service. • The combined TRIP test function of the MRIK3 relay al- phase by phase with the current indications of the am- meter of the switchboard to verify that the relay works lows to test the relay output circuits.
  • Page 35 20% of the third harmonic; <0.08% per percent of the third harmonic up to 20% of the fifth harmonic; <0.07% per percent of the fifth harmonic Influences on delay times: no additional influences can be measured GL-Approbation: 98775-96 Bureau Veritas Approbation: 2 650 6807 A00H TB MRIK3 12.00 E...
  • Page 36 0.01; 0.02; 0.05; 0.1; 0.2; 0.5 x I ±1% I ±3% or ±15 ms >> 0.04...10 s (EXIT) 0.01 s; 0.02 s; 0.05 s; 0.1 s; 0.2 s Table 7.2: Setting ranges for earth fault protection TB MRIK3 12.00 E...
  • Page 37 ⋅ >   *RXIDG – characteristic         Where: = tripping time > = time multiplier = fault current Is = Starting current natural logarithm *only for earth current TB MRIK3 12.00 E...
  • Page 38 Figure 7.3: Extremely Inverse Figure 7.1: Normal Inverse 1000 I> 10.0 I> t[s] t[s] 10.0 0.05 0.05 5 6 7 8 9 10 5 6 7 8 9 10 Figure 7.4: RI-Inverse Figure 7.2: Very Inverse TB MRIK3 12.00 E...
  • Page 39 0.03 I>> >> 0.03 0.05 0.01 5 6 7 8 9 10 Figure 7.5: Long Time Inverse Figure 7.7: Definite time overcurrent relay I> 10.0 t[s] 0.05 5 6 7 8 9 10 Figure 7.6: RXIDG-characteristic TB MRIK3 12.00 E...
  • Page 40 RS485 Open Data Protocol Slave-Address 1 - 32 1 - 32 Baud-Rate* 1200, 2400, 4800, 9600 9600 (fixed) Parity* even, odd, no “even Parity” (fixed) Table 7.7: Intereface parameters *only Modbus Protocol Parameters for the fault recorder TB MRIK3 12.00 E...
  • Page 41 Table 7.8: Parameters for the fault recorder * is written over when a new trigger signal arrives Design standard VDE 0435, Part 303; IEC255-4 VDEW ring book - Protection technique Requirements on the C.B.s: DIN VDE 0670 TB MRIK3 12.00 E...
  • Page 42 Time overcurrent relay with AR MRIK3- 3-phase meauring I>, I>> Rated current Earth current measuring Rated current in earth path Housing (12TE) 19“-rack Flush mounting RS485 Alternatively with Modbus Proto- Technical data subject to change without notice! TB MRIK3 12.00 E...
  • Page 43 Close impulse time t Reclaim time t 10.0 active Fault time activation Block/Trip Block/trip - time EXIT Max. Circuit breaker tripping time EXIT CBFP 50/60 Hz Rated frequency Slave address Baud-Rate* 9600 Parity-Check* even only Modbus Protocol TB MRIK3 12.00 E...
  • Page 44 _ 2 _ _ E>> E>> Tripping 1 _ _ _ IE>> CBFP Tripping _ _ _ _ Switch on _ _ _ 4 AR + t Unsuccessful _ _ 3 _ AR + O→I rot TB MRIK3 12.00 E...
  • Page 45 TIME TIME I>> TIME TIME IE> TIME TIME IE>> TIME TIME Activation of the 4 AR per I> I>> IE> IE>> Trip after 4 I> TIME TIME I>> TIME TIME IE> TIME TIME IE>> TIME TIME TB MRIK3 12.00 E...
  • Page 46 CB-On-Input Default setting Actual setting Default setting Actual setting Default setting Actual setting Low = plugged High = not plugged This manual is valid for relay software version from Software-Versions No. D01-2.13 Modbus Versions Nr. D51-1.23 TB MRIK3 12.00 E...

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