Arc Protection With Several Ref 610 Relays - ABB REF 610 Technical Reference Manual

1MRS755310
6.2.2.
Feeder Protection Relay
Technical Reference Manual
Q1
3l
Q2
Q3 Q4
Fig. 6.2.1.-1 Arc protection with one REF 610

Arc protection with several REF 610 relays

When using several REF 610 relays (see Fig. 6.2.2.-1), a REF 610 protecting an
outgoing feeder will trip the circuit breaker of the outgoing feeder when detecting an
arc at the cable terminations. If the REF 610 protecting the outgoing feeder detects
an arc on the busbar (via the other lens sensor), however, it will generate a signal to
the REF 610 protecting the incoming feeder. On detection of the signal, the
REF 610 protecting the incoming feeder will trip the circuit breaker of the incoming
feeder and generate an external trip signal to all REF 610 relays protecting outgoing
feeders, which in turn will result in tripping of all circuit breakers of outgoing
feeders.
For maximum safety, the REF 610 relays can be configured to trip all circuit
breakers, regardless of where the arc is detected.
M1
PO3
PO1
Q5 Q6
REF 610 REF 610
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