VAMP Ltd Overcurrent and earth-fault relay
Technical description
VAMP 140
VM140.EN011 Vamp 24h support phone +358 (0)40 573 6316
31
3.6. 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.
3.7. 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
To Next Page
Loading...
