ABB RELION REX640 Technical Manual page 1090

Protection and control

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Protection functions

Arc protection with several protection relays

When using several protection relays, the protection relay protecting the outgoing

feeder trips the circuit breaker of the outgoing feeder when detecting an arc at the

cable terminations. If the protection relay protecting the outgoing feeder detects an

arc on the busbar or in the breaker compartment via one of the other lens sensors,

it generates a signal to the protection relay protecting the incoming feeder. When

detecting the signal, the protection relay protecting the incoming feeder trips the

circuit breaker of the incoming feeder and generates an external trip signal to all

protection relays protecting the outgoing feeders, which in turn results in tripping

of all circuit breakers of the outgoing feeders. For maximum safety, the protection

relays can be configured to trip all the circuit breakers regardless of where the arc is

Figure 611: Arc protection with several protection relays and normal outputs

1MRS759142 F

Technical Manual