18 VD4-36KV CRADLE RETROFIT SOLUTION SERVICE INSTRUCTION MANUAL
Table 2.2
Checking operation Time interval Criteria
1 Carry out five mechanical
opening/closing operations
1 year The circuit-breaker must operate normally without stopping in
intermediate positions.
2 Visual inspection of the poles
(parts in resin)
1 year or 5000 operations The parts in resin must be free of any accumulation of dust,
dirt, cracks, discharges or traces of surface discharges.
3 Visual inspection of the
operating mechanism and
transmission
1 year or 5000 operations The elements must be free of any deformation.
Screws, nuts, bolts, etc. must be tight.
4 Visual inspection of the
isolating contacts
5 years or 5000 operations The isolating contacts must be free of any deformation or
erosion.
Lubricate the contact elements with industrial Vaseline
grease.
5 Measuring the insulation
resistance
5 years or 5000 operations See table 2 1. point 1
6 Checking interlock operation 5 years The interlocks provided must operate correctly
—
Periodic checking
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