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1MRS 755310
5.2.
5.2.1.
Feeder Protection Relay
Technical Reference Manual
Arc protection
Arc protection with one REF 610 relay
In installations with limited possibilities to realize signalling between relays
protecting incoming and outgoing feeders, or if only the relay for the incoming
feeder is to be exchanged, an arc protection with a lower protective level can be
achieved with one protection relay.
An arc protection with one REF 610 only (see Fig. 5.2.1.-1) is realized by installing
two arc lens sensors, connected to the relay protecting the incoming feeder, to detect
an arc on the busbar. On arc detection, the arc protection stage will trip the circuit
breaker of the incoming feeder. The maximum recommended installation distance
between the two lens sensors in the busbar area is 6 meters and the maximum
distance from a lens sensor to the end of the busbar 3 meters.
Q1
3l
Q2
Q3
Q4
Fig. 5.2.1.-1
Arc protection with one REF 610
M1
PO3
PO1
Q5
Q6
REF 610
141
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