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VD4 -3 6 K V CR A DLE R ETROFIT SOLUTION
SER V I C E I N S T R U C T I O N M A N UA L
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
Summary of Contents for VD4 Series
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