ABB RELION REX640 - Page 1090

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
detected.
Q1
Q2
Q3 Q4 Q5 Q6
SPO3
SPO1
3I, Io
S1 S2 S3 S4
DI1
SO1SO1
DI1
DI1
DI1
3I, Io3I, Io 3I, Io3I, Io
DI1
SO1
SO1
S
4
S
3
S
S
2
S
1
SO1
Figure 611: Arc protection with several protection relays and normal outputs
Protection functions
1MRS759142 F
1090 REX640
Technical Manual