Circuit-Breaker Failure Protection Via The Output Relay T2; Trip Circuit Supervision - VAMP 140 Operation And Configuration Instructions

VAMP Ltd
3.6.
3.7.
VM140.EN011
Overcurrent and earth-fault relay
Technical description
Circuit-breaker failure protection via
the output relay T2
Figure 3.6-1 When the circuit-breaker failure protection is used it is
configured to control the output relay T2, which usually controls the
following upstreams circuit breaker.

Trip circuit supervision

Trip circuit supervision is used to ensure that the wiring from
protective relay to the circuit breaker is in order. This circuit is
most of the time unused but when the protection relay detects a
fault in the network it is too late to notice that the circuit
breaker cannot be tripped because of a broken trip circuitry.
A digital input of the relay can be used for trip circuit
monitoring.
The digital input is connected in parallel with the trip
•
contacts (Figure 3.7-1).
A resistor module VR10CB enables supervision also when
•
the circuit breaker is open. The module consist resistor for
Vamp 24h support phone +358 (0)40 573 6316
VAMP 140
31