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VAMP Ltd
Overcurrent and earth-fault relay
Technical description
VAMP 140
VM140.EN011
Vamp 24h support phone +358 (0)40 573 6316
1
Table of Content
1.
Introduction ............................................................................3
1.1.
Application ..........................................................................3
1.2.
Main features.......................................................................3
2.
Functions .................................................................................5
2.1.
Principles of the numerical protection technique.........5
2.2.
Relay protection functions ................................................7
2.2.1.
Overcurrent protection I>, I>>, I>>> (50/51)..........7
2.2.2.
Non-directional earth-fault protection (50/51N) 13
2.2.3.
Phase unbalance protection I
2
> (46) .................. 14
2.2.4.
Second harmonic stage / inrush (68) .................. 15
2.2.5.
Thermal overload protection T> (49F) ................. 16
2.2.6.
Arc fault protection (option) ArcI> (51 L>), ArcI
0
>
(51N L>) .................................................................... 18
2.2.7.
Circuit-breaker failure protection CBFP (50BF) .. 20
2.3.
Measurement functions of the relay............................. 21
2.4.
Output relay and blocking functions............................ 21
2.4.1.
Output relay matrix ................................................ 22
2.4.2.
Blocking matrix........................................................ 22
2.5.
Communication ............................................................... 22
2.5.1.
PC port ..................................................................... 22
2.5.2.
Remote control connection ................................. 23
2.6.
Disturbance recorder ...................................................... 23
2.7.
Self-supervision.................................................................. 25
3.
Application examples .........................................................26
3.1.
Overcurrent, earth-fault and phase discontinuity
protection of an overhead line feeder ....................... 26
3.2.
Overcurrent and earth-fault protection of an
overhead line feeder...................................................... 27
3.3.
Overcurrent, earth-fault and arc protection of a
distribution transformer feeder...................................... 28
3.4.
Power transformer HV side overcurrent and earth-fault
protection......................................................................... 29
3.5.
Fast busbar short-circuit protection based on blockings
30
3.6.
Circuit-breaker failure protection via the output relay
T2........................................................................................ 31
3.7.
Trip circuit supervision ...................................................... 31
3.8.
Complete protection of a HV capacitor bank........... 35
3.9.
Three-phase overcurrent protection with two current
transformers...................................................................... 36
3.10.
DI controlled overcurrent scaling ................................. 36
4.
Connections .........................................................................38
4.1.
Digital input ....................................................................... 38
4.2.
Auxiliary voltage............................................................... 39
4.3.
Output relays .................................................................... 39