Medium voltage switchgear QMT
83
Installa
tion manual
6.3
Maintenance program for vacuum circuit breaker
During normal service the circuit-breaker is maintenance-free. Interventions depend on the sever-
ity of service conditions, frequency of operations, interrupted current values or installation ambi-
ent. We suggest the following periodical checking:
Each year or 1.000 operations:
- Carry out 5 mechanical opening/closing operations: the CB must operate normally without
stopping in intermediate positions.
Each year or 5.000 operations:
- Visual inspection of the poles: they must be free of dust, cracks, discharge or traces of surface
discharges.
- Visual inspection of the operating mechanism: there must be no deformation and the screw,
bolts, nuts must be tight.
- Measuring the insulation resistance: MV circuits must have at least 50MΩ resistance and in any
case constant over time. For auxiliary circuits it should some MΩ and in any case constant over
time.
- Checking interlock operations: the interlocks provided must operate correctly.
CAUTION!
After 10.000 operations or after 10 years please contact SEL to check the circuit-breaker.
Содержание QMT Series
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