Figure 71: Single Line Diagram, The Circuit Breaker Is In The Test Position - ABB UniGear Digital Commissioning And Testing Manual

I NT ER LO C K S BE T W EE N PA NE LS
Step 1/4
All circuit breakers in the relative section are in the test position. Check the circuit breakers
status via the protection relay LHMIs.

Figure 71: Single line diagram, the circuit breaker is in the test position

Step 2/4
Check the busbar earthing switch shutter. It can be open and the crank inserted.
Step 3/4
Fix the shutter in the open position.
Step 4/4
Check that no circuit breakers in the section can be moved out of the test position no more
than a half turn of the crank.
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AP PAR ATU S CO NTR O L T E S TI NG
1 VLG 5000 17 C