ABB RELION 620 Series Technical Manual page 559

1MAC504801-IB E
620 series ANSI
Technical Manual
A040362-ANSI V1 EN
Figure 271: Arc protection with one protection relay
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 will generate 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
Protection-related functions
Section 5
553