Arc Protection Inter-Trip; Figure 90: Logic Scheme Of Arc Trip; Figure 91: Single Line Diagram, The Circuit Breaker Is In The Service Position - ABB UniGear Digital Commissioning And Testing Manual

AP PAR ATU S CO NTR O L T E S TI NG
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

1 VLG 500 0 17 C
I NT ER LO C K S BE T W EE N PA NE LS
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