maximum safety, the IEDs can be configured to trip all the circuit breakers
regardless of where the arc is detected.
Q1
Q2
M1
Q3 Q4 Q5 Q6
PO3
PO1
3I, Io
S1 S2 S3 S4
DI1
SO1SO1SO1
DI1
DI1
DI1
3I, Io3I, Io 3I, Io3I, Io
DI1
SO1
SO1
A040363 V3 EN
Figure 270: Arc protection with several IEDs
Arc protection with several IEDs and a separate arc protection system
When realizing an arc protection with both IEDs and a separate arc protection
system, the cable terminations of the outgoing feeders are protected by IEDs using
one lens sensor for each IED. The busbar and the incoming feeder are protected by
the sensor loop of the separate arc protection system. With arc detection at the
cable terminations, an IED trips the circuit breaker of the outgoing feeder.
However, when detecting an arc on the busbar, the separate arc protection system
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.
Section 4 1YHT530004D05 D
Protection functions
518 615 series
Technical Manual
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