88
7.3.2.3.2 Cleaning the kinematics and the main contacts
• Carry out a visual inspection of the mechanical connections and check for any presence of dirt,
humidity and signs of corrosion on the main operating shaft and on the contact parts of the blades;
• Remove any deposits of dust using a dry cloth that does not leave any deposits on the treated
surfaces (do not use woollen cloths);
• If necessary, grease the moving mechanical parts by applying a thin layer of mechanical grease for
moving parts.
7.3.2.3.3 Cleaning, greasing and checking the kinematics
• Carry out a visual inspection of the kinematics and check for any presence of dirt, humidity and signs
of corrosion on the moving parts;
• Remove any deposits of dust using a dry cloth that does not leave any deposits on the treated
surfaces (do not use woollen cloths);
• If necessary, grease the mechanical moving parts by applying a thin layer of mechanical grease for
moving parts.
Figure 136: EK6 earthing switch
7.3.2.3.4 Reaching mechanical life limit
The mechanical life of the earthing switch is set at 2000 opening/closing operations. After the operation
counter has reached this number, inform ABB who will verify directly that the mechanical life limit of
the earthing switch has been reached.
Note
The operation counter is not provided with the switchgear. It is up to the engineering department to
connect the auxiliary closed/open contacts in order to measure the number of operations carried out.
7.3.2.4 Earthing switch operation mechanism
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 no.5 closing/opening operations of the earthing switch.
Cleaning the kinematics to prevent faults on the signalling contacts
• Carry out a visual inspection of the kinematics and check for any presence of dirt, humidity and signs
of corrosion on the moving parts;
• Manually check correct changeover of the earthing switch signalling contacts 18 (figure 137);
• Remove any deposits of dust using a dry cloth that does not leave any deposits on the treated
surfaces (do not use woollen cloths);
• If necessary, grease the mechanical moving parts by applying a thin layer of mechanical grease for
moving parts.
Cleaning, greasing and checking the kinematics
• Carry out a visual inspection on the toothed wheel and pinion 20 (figure 138) and check any presence
of dirt, humidity and signs of corrosion on the moving parts;
• Remove any deposits of dust using a dry cloth that does not leave any deposits on the treated
surfaces (do not use woollen cloths);
• If necessary, grease the mechanical moving parts by applying a thin layer of mechanical grease for
moving parts.
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