87
7.3.2 Maintenance in cable compartment
7.3.2.1 Checking tightening of the cable busbar connections
• Make the plant you want to work on safe (follow the plant safety regulations);
• Make sure that the circuit-breaker is in the open position;
• Rack the circuit-breaker out from the service position to the test/isolated position;
• Manually close the earthing switch;
• Open the cable compartment door; the cable busbar connections are visible;
• Using a dynamometric spanner, check tightness of all the screws. Refer to the table on page 40 for
the tightening values;
6.1
23
17.2
17
Figure 135: Internal view of the cable connection compartment, with a maximum number of six cables in parallel
6.1 Earthing switch position indicator
17 Slotted bottom plate
17.2 Fairlead
23 Cable busbar connection
Note
The cable compartment door cannot be opened if the earthing switch is open.
7.3.2.2 Visual inspection of the insulating materials
• Make the plant you want to work on safe (follow the plant safety regulations);
• Make sure that the circuit-breaker is in the open position;
• Rack the circuit-breaker out from the service position to the test/isolated position;
• Manually close the earthing switch;
• Open the cable compartment door; the connections cable busbar are visible;
• Visually check that the bottom monoblocs 5 where the tulip isolating contact is housed are integral
and do not show any breakages;
• Visually check that the insulating covering of the cable busbar connections is integral and does not
show any breakages.
7.3.2.3 Earthing switch – type EK6
7.3.2.3.1 Carrying out mechanical operations to check the kinematics
• Make the plant you want to work on safe (follow the plant safety regulations);
• Make sure that the circuit-breaker is in the open position;
• Rack the circuit-breaker out from the service position to the test/isolated position;
• Manually carry out 5 closing/opening operations of the earthing switch.
To Next Page
Loading...
Need help?
General
