ABB RELION REX640 Technical Manual page 995

1MRS759142 C
REX640
Technical Manual
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
3I, Io
SPO1
Q2
Q3
DI1
3I, Io
S1
SO1
GUID-AB63EF4C-89EB-4993-B432-55C708D22A7C V1 EN
Figure 535: Arc protection with several protection relays and normal outputs
SPO3
DI1
SO1
Q4
DI1 DI1
3I, Io
S2 S3
SO1
Section 4
Protection functions
Q5 Q6
3I, Io 3I, Io
SO1
DI1
S4
SO1
989