ABB Relion 620 Series - Page 753

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
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
REF 615 REF 615 REF 615REF 615 REF 615
REF 615
Figure 393: Arc protection with several protection relays and normal outputs
1MRS757644 H
Protection functions
620 series
Technical Manual
753