ABB RED615 Technical Manual page 523

1YHT530004D05 D
615 series
Technical Manual
Arc protection with one IED
In installations, with limited possibilities to realize signalling between IEDs
protecting incoming and outgoing feeders, or if only the IED 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 IED only is realized
by installing two arc lens sensors connected to the IED protecting the incoming
feeder to detect an arc on the busbar. In arc detection, the arc protection stage trips
the circuit breaker of the incoming feeder. The maximum recommended
installation distance between the two lens sensors in the busbar area is six meters
and the maximum distance from a lens sensor to the end of the busbar is three meters.
A040362 V1 EN
Figure 269: Arc protection with one IED
Arc protection with several IEDs
When using several IEDs, the IED protecting the outgoing feeder trips the circuit
breaker of the outgoing feeder when detecting an arc at the cable terminations. If
the IED 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 IED protecting the incoming feeder. When detecting the signal, the IED
protecting the incoming feeder trips the circuit breaker of the incoming feeder and
generates an external trip signal to all IEDs protecting the outgoing feeders, which
in turn results in tripping of all circuit breakers of the outgoing feeders. For
Section 4
Protection functions
517