AP PAR ATUS CO NTR O L T E STI NG INT ERLOC KS BE T W EE N PA NE LS
1VLG5 00 0 17 C 59
5.2.5 Arc protection inter-trip
The switchgear is fitted with lenses detecting flashlight from an electrical Arc in each com-
partment. Sensors are connected to the protection relay. In case of flashlight detection, the
protection relay immediately sends the trip command to the circuit breaker. The trip com-
mand is further distributed over the switchgear based on the location of the Arc.
It is good practice to also forward the inter-trip to outgoing feeders in the section to inter-
rupt the current contribution from the load like motors.
Figure 90: Logic scheme of ARC trip
Step 1/11
Move all the circuit breaker trucks into the service position in the relative section, Check the
circuit breakers truck status on the protection relay LHMIs.
Figure 91: Single line diagram, the circuit breaker is in the service position
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