VAMP Ltd
Feeder and motor manager
Technical description
VAMP 257
VM257.EN002
VAMP 24h support phone : +358 (0)20 753 3264
1
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