VAMP 257 - Introduction;Functions

VAMP Ltd Feeder and motor manager
Technical description
VAMP 257
VM257.EN002 VAMP 24h support phone : +358 (0)20 753 3264
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Table of Contents
1. Introduction ............................................................................5
1.1. Application.........................................................................5
1.2. Main features.....................................................................6
2. Functions.................................................................................7
2.1. Principles of numerical protection techniques.............7
2.2. Manager function dependencies..................................9
2.2.1. Manager function reference guide ......................9
2.2.2. Application modes................................................ 10
2.2.3. Current protection function dependencies...... 11
2.3. Manager functions ........................................................ 11
2.3.1. Overcurrent protection (50/51)........................... 11
2.3.2. Short-circuit fault location.................................... 22
2.3.3. Earth-fault location................................................ 24
2.3.4. Directional overcurrent protection (67)............. 25
2.3.5. Broken conductor protection (46)...................... 33
2.3.6. Unbalance protection (46).................................. 34
2.3.7. Phase reversal / incorrect phase sequence
protection (47) ....................................................... 35
2.3.8. Stall protection (48)............................................... 36
2.3.9. Frequent start protection (66).............................. 37
2.3.10. Undercurrent protection (37)............................... 39
2.3.11. Directional earth fault protection (67N)............. 39
2.3.12. Earth fault protection (50N/51N)......................... 44
2.3.13. Capacitor bank unbalance protection ............ 46
2.3.14. Residual voltage protection (59N)...................... 49
2.3.15. Thermal overload protection (49)....................... 51
2.3.16. Auto-reclose function (79).................................... 54
2.3.17. Overvoltage protection (59)................................ 58
2.3.18. Undervoltage protection (27).............................. 61
2.3.19. Reverse power and underpower protection (32)
.................................................................................. 62
2.3.20. Overfrequency and underfrequency protection
(81H/81L)................................................................. 63
2.3.21. Underfrequency protection (81L) ....................... 65
2.3.22. Rate of change of frequency (ROCOF)
protection df/dt (81R)........................................... 66
2.3.23. Second harmonic stage / inrush (68)................. 70
2.3.24. Synchrocheck (25)................................................. 72
2.3.25. Circuit-breaker failure protection (50BF)............ 77
2.3.26. Arc fault protection (50AR) (option)................... 78
2.3.27. Programmable stage............................................ 80
2.4. Measurement functions ................................................ 82
2.4.1. Fundamental frequency measurement ............ 82
2.4.2. Power calculations................................................ 82
2.4.3. Harmonics and Total Harmonic Distortion (THD)84