VAMP 140 - Section 2

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