Technical description
Table of Contents
VM50.EN004
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37
Table of Contents
Introduction ..........................................................................41
Main features................................................................... 41
Principles of numerical protection techniques .......... 42
Protection functions .............................................................44
Maximum number of protection stages in one
application................................................................................ 44
List of protection functions............................................. 44
General features of protection stages ........................ 45
Relay function dependencies ...................................... 48
Application modes................................................. 48
Current protection function dependencies....... 49
Overcurrent protection I> (50/51) ................................ 49
Remote controlled overcurrent scaling.............. 53
> (46R)................................. 54
> (46)................................. 55
Phase reversal/incorrect phase sequence protection
>> (47)...................................................................................... 58
> (48)................................................... 58
Frequent start protection N> (66) ................................. 60
Undercurrent protection I< (37) .................................... 62
Directional earth fault protection I
> (50N/51N)............................. 68
Intermittent transient earth fault protection I
Zero sequence voltage protection U
Thermal overload protection T> (49) ........................... 81
Single-phase overvoltage protection U> (59) ............ 84
Single-phase undervoltage protection U< (27).......... 86
> (51F2) .................... 88
Circuit breaker failure stage CBFP (50BF).................... 89
Programmable stages (99)............................................ 91
Arc fault protection (50ARC/50NARC)-optional........ 94
Inverse time operation ................................................... 97
Standard inverse delays IEC, IEEE, IEEE2, RI ........ 99
Free parameterization using IEC, IEEE and IEEE2
equations........................................................................... 109
Programmable inverse time curves................... 110
Supporting functions ..........................................................111
Event log......................................................................... 111
Disturbance recorder ................................................... 112
Cold load pick-up and inrush current detection..... 115
Current transformer supervision .................................. 117
Circuit breaker condition monitoring......................... 118
Energy pulse outputs .................................................... 124
System clock and synchronization ............................. 127