VAMP 140 Operation And Configuration Instructions page 31

VAMP Ltd
VM140.EN011
Overcurrent and earth-fault relay
Technical description
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
2.2.4. 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
(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
Vamp 24h support phone +358 (0)40 573 6316
VAMP 140
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