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
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