ABB RELION REX640 Technical Manual page 994

Section 4
Protection functions
988
Q1
3I
Q2
Q3
GUID-0E9CBB16-39EA-4C24-8D51-8BF151AA753B V1 EN
Figure 534: Arc protection with one protection relay
Arc protection with several protection relays
When using several protection relays, the protection relay protecting the outgoing
feeder trips the circuit breaker of the outgoing feeder when detecting an arc at the cable
terminations. If the protection relay protecting the outgoing feeder detects an arc on
SPO3
M1
SPO1
Q4 Q5
1MRS759142 C
Q6
REX640
Technical Manual