SEG Electronics GmbH Manual MRG3
4 DOK-TD-MRG3, Rev. D
5.5.2 Time current characteristics for phase over current element .......................................46
5.5.3 Trip delay or time factor for phase over current element..............................................46
5.5.4 Reset mode for all tripping characteristics in the phase current path...........................47
5.5.5 Pick-up value for high set element................................................................................47
5.5.6 Trip delay for high set element .....................................................................................47
5.6 Parameter protection earth fault supervision....................................................................48
5.6.1 Pick-up value for residual voltage.................................................................................48
5.6.2 Trip delay for residual voltage (only MRG3-IU0 and MRG3-U0)..................................48
5.6.3 Pick-up value for earth fault element............................................................................48
5.6.4 WARN/TRIP changing-over..........................................................................................48
5.6.5 Time current characteristics for earth fault element (only MRG3-IE)...........................48
5.6.6 Trip delay or time multiplier for earth fault element ......................................................49
5.6.7 Reset mode for tripping characteristics in earth current path.......................................49
5.6.8 Pick-up value for earth faults resp. earth short circuit fast trips....................................49
5.6.9 Trip delay for earth fault s resp. earth short circuit fast trips ........................................49
5.6.10 COS/SIN-measurement............................................................................................49
5.7 More Settings....................................................................................................................50
5.7.1 Circuit breaker failure protection...................................................................................50
5.7.2 Adjustment of the slave address...................................................................................50
5.7.3 Setting of Baud-rate (applies for Modbus Protocol only)..............................................50
5.7.4 Setting of parity (applies for Modbus Protocol only).....................................................50
5.8 Fault recorder ...................................................................................................................51
5.8.1 Adjustment of the fault recorder....................................................................................51
5.8.2 Number of the fault recordings .....................................................................................51
5.8.3 Adjustment of trigger occurrences................................................................................51
5.8.4 Pre-trigger time.............................................................................................................51
5.8.5 Adjustment of the clock.................................................................................................52
5.9 Additional functions...........................................................................................................53
5.9.1 Blocking of protection functions and assignment of the output relays..........................53
5.10 Indication of measuring values.........................................................................................55
5.10.1 Measuring indication for mains decoupling ..............................................................55
5.10.2 Storage of min./max. values .....................................................................................55
5.10.3 Unit of the measuring values displayed....................................................................56
5.10.4 Indication of values measured for over current - and earth fault protection............56
5.10.5 Units of the measuring values ..................................................................................57
5.10.6 Indication of fault data...............................................................................................58
5.10.7 Fault recorder............................................................................................................58
5.10.8 Erasure of fault storage ............................................................................................59
5.10.9 Reset.........................................................................................................................60
5.10.10 Delete of disturbance records...................................................................................60
6. Maintenance and Commissioning............................................................61
6.1 Connection of aux. voltage...............................................................................................61
6.2 Testing of the output relays and LEDs .............................................................................61
6.3 Checking the set values....................................................................................................62
6.4 Test with transformer secondary current (Secondary injection test)..............................62
6.4.1 Equipment required to test voltage functions ...............................................................62
6.4.2 Test circuit.....................................................................................................................63
6.4.3 Checking of the input circuits and measuring functions ...............................................64
6.4.4 Checking the pick-up and release values for over/under voltage.................................64
6.4.5 Checking of the tripping delay time for over/under voltage ..........................................64
6.4.6 Checking of the pick-up and release values for over/under frequency ........................65
6.4.7 Checking of the tripping delay time for over/under frequency s ...................................65
6.4.8 Checking of the vector surge function ..........................................................................65
6.5 Test with transformer secondary current (Secondary injection test)..............................66
6.5.1 Equipment required to test voltage functions ...............................................................66
6.5.2 Test circuit for the current function ...............................................................................67
6.5.3 Checking the input circuits and measured values........................................................67
6.5.4 Checking the operating and resetting values of the relay ............................................68
6.5.5 Checking of the tripping delay ......................................................................................68
6.5.6 Checking the high set element of the relay ..................................................................68
6.6 Example of a test circuit for MRG3-IER-relay with earth current directional feature......69
