Figure 67: Single Line Diagram, The Circuit Breaker Is In The Test Position; Figure 68: Single Line Diagram, The Circuit Breaker Is In The Intermediate Position - ABB UniGear Digital Commissioning And Testing Manual

I NT ER LO C K S BE T W EE N PA NE LS
Step 1/5
All circuit breakers must be in the test position. Check their status on the protection relay
LHMIs on the Single line diagram.

Figure 67: Single line diagram, the circuit breaker is in the test position

Step 2/5
Check the busbar earthing switch shutter. It can be open and the crank inserted.
Step 3/5
Move the circuit breaker out of the test position about a half-turn of the crank in one feeder.
Check the circuit breaker position on the protection relay LHMI.

Figure 68: Single line diagram, the circuit breaker is in the intermediate position

Step 4/5
Check the busbar earthing switch shutter. It cannot be open (crank cannot be inserted).
Step 5/5
Repeat step 3 and 4 for each feeder in the relative section
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AP PAR ATU S CO NTR O L T E S TI NG
1 VLG 5000 17 C