Power-On Procedure
1 Install the rear panel, then close the front lower door.
2 Operate the earthing switch shaft to the open position.
3 Use a transfer truck (platform trolley) to push the withdrawable unit (in the open state) into the cabinet (to the test position).
4 Insert the secondary plug into the fixed socket (the "Test Position" indicator lights up), then close the front middle door.
5 Use the operating handle to move the withdrawable unit from the test position (open state) to the service position (the "Service Position" indicator lights up; the "Test Position" indicator turns off).
6 Close the circuit breaker unit.
Power-Off (Maintenance) Procedure
1 Open the circuit breaker unit.
2 Use the operating handle to move the withdrawable unit from the service position (open state) back to the test position.
3 (The "Service Position" indicator turns off; the "Test Position" indicator lights up).
4 Open the front middle door.
5 Disconnect the secondary plug from the fixed socket (the "Test Position" indicator turns off).
6 Use the transfer truck to withdraw the unit (in the open state) from the cabinet.
7 Operate the earthing switch shaft to the closed position.
8 Open the rear panel and the front lower door.
Note: The lower lightning arrester unit and the middle (or lower) PT unit can be withdrawn directly from the cabinet while the busbar is energized.