VAMP 52 - VM50.EN004 b

Technical description Table of Contents
VM50.EN004 VAMP 24h support phone +358 (0)20 753 3264
37
Table of Contents
1. Introduction ..........................................................................41
1.1. Main features................................................................... 41
1.2. Principles of numerical protection techniques .......... 42
2. Protection functions .............................................................44
2.1. Maximum number of protection stages in one
application................................................................................ 44
2.2. List of protection functions............................................. 44
2.3. Genera
l features of protection stages ........................ 45
2.4. Re
lay function dependencies ...................................... 48
2.4.1. Application modes................................................. 48
2.4.2. Current protection function dependencies....... 49
2.5. Ov
ercurrent protection I> (50/51) ................................ 49
2.5.1. Re
mote controlled overcurrent scaling .............. 53
2.6. Broken line protection I
2
/I
1
> (46R)................................. 54
2.7. Current unbalance stage I
2
> (46)................................. 55
2.8. Phase reversal/incorrect phase sequence protection
I
2
>> (47)...................................................................................... 58
2.9. Stall protection I
st
> (48)................................................... 58
2.10. Frequent start protection N> (66) ................................. 60
2.11. Undercurrent protection I< (37) .................................... 62
2.12. Directional earth fault protection I
0φ
> (67N)............... 62
2.13. Earth fault protection I
0
> (50N/51N)............................. 68
2.14. Intermittent transient earth fault protection I
0T
> (67NT)
73
2.15. Zero sequence voltage protection U
0
> (59N) ............ 78
2.16. Thermal overload protection T> (49) ........................... 81
2.17. Single-phase overvoltage protection U> (59) ............ 84
2.18. Si
ngle-phase undervoltage protection U< (27).......... 86
2.19. Second harmonic O/C stage I
f2
> (51F2) .................... 88
2.20. Ci
rcuit breaker failure stage CBFP (50BF).................... 89
2.21. Programmable stages (99)............................................ 91
2.22. Arc fault protection (50ARC/50NARC)-optional........ 94
2.23. In
verse time operation ................................................... 97
2.23.1. S
tandard inverse delays IEC, IEEE, IEEE2, RI ........ 99
2.23.2. Free parameterization using IEC, IEEE and IEEE2
equations........................................................................... 109
2.23.3. P
rogrammable inverse time curves................... 110
3. Supporting functions
..........................................................111
3.1. Event log......................................................................... 111
3.2. Disturbance recorder ................................................... 112
3.3. Cold load pick-up and inrush current detection..... 115
3.4. C
urrent transformer supervision .................................. 117
3.5. Ci
rcuit breaker condition monitoring......................... 118
3.6. Energy pulse outputs .................................................... 124
3.7. System clock and synchronization ............................. 127