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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.
Summary of Contents for QMT Series
Page 1: ...Y4419D 01GF 18W12 QMT Manuale installatore Installation manual ...
Page 2: ...2 IT UK ITALIANO 3 ENGLISH 45 QMT ...
Page 15: ...Quadri Media Tensione QMT Manuale installatore 15 Tipo 2 Tipo 3 Tipo 4 ...
Page 44: ......
Page 57: ...Medium voltage switchgear QMT 57 Installation manual Type 2 Type 3 Type 4 ...
Page 86: ...86 Notes ...
Page 87: ...87 ...