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INT ER LOCK S BE T W EE N PA NELS AP PAR ATUS CO NTR O L T E STING

58 1 VLG5000 17 C

Step 1/6

Move all circuit breaker trucks into the service position in the relative section. Check all the

circuit breakers trucks status on the protection relay LHMIs.

Figure 88: Single line diagram, the circuit breaker is in the service position

Step 2/6

Close all circuit breakers in the relative section. Check all the circuit breakers status on the

protection relay LHMIs.

Figure 89: Single line diagram, the circuit breaker is closed and in the service position

Step 3/6

Select the feeder to be tested. Simulate a trip of the first flap (order of flap to be tested no

matter). Bring potential to the binary input for a short time. The circuit breaker must trip and,

according to inter-trip logic scheme, forward the trip command to the upstream breaker (In-

comer, Generator and Bus tie). The upstream circuit breaker must trip immediately all feeders

in the relative section shall trip at the same time if inter-trip is designed.

Step 4/6

Check interlocking logic. Clear Lockouts

Step 5/6

Repeat step 3 for next two flaps in the same feeder.

Step 6/6

Repeat steps 2 to 5 for all feeders.

ABB UniGear Digital Commissioning And Testing Guide

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