ABB RELION 620 Series Technical Manual page 560

Section 5
Protection-related functions
554
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 detected.
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GUID-0A206DE3-539F-4F42-B255-A19C426574FA V1 EN
Figure 272: Arc protection with several protection relays
Arc protection with several protection relays and a separate arc protection
system
When realizing an arc protection with both protection relays and a separate arc protection
system, the cable terminations of the outgoing feeders are protected by protection relays
using one lens sensor for each protection relay. The busbar and the incoming feeder are
protected by the sensor loop of the separate arc protection system. With arc detection at
the cable terminations, an protection relay trips the circuit breaker of the outgoing feeder.
However, when detecting an arc on the busbar, the separate arc protection system 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.
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1MAC504801-IB E
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620 series ANSI
Technical Manual
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