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1.5 Maintenance of Operating Mechanism
Before carrying out the maintenance of operating mechanism ensure that the breaker
is open, the sequential isolators are open and the closing and opening springs are
discharged.
1.5.1 Maintenance schedule
Sr Description Before start Every 1000
No. Up operations
1. Checking of operating mechanism.
2. Checking of fastener tightness.
3. Checking of shock absorbers for
leakage or struck up.
4. Checking of various tension springs
and bending springs for their proper
place.
5. Closing and tripping spring assembly -
and split pin/ Circlip on them.
6. Bearing items. -
7. Checking of Operation box Assembly
for proper open/close operation.
8. Checking of setting. Proper
engagement of lever on shaft.
9. Spring cut off micro switches.
10. Lubrication of charging device and
operating gear
NOTE
1.
Complete overhaul of circuit breaker operating mechanism to be done after 10000
operation or 10 years, whichever is earlier.
2.
Ask ABB Nasik for details of overhaul procedure.
Summary of Contents for OVB-SDB
Page 26: ......
Page 49: ...Fig 1 Lifting of Circuit Breaker 50 ...
Page 52: ...Fig 4 Breaker Pole Assembly Refer legend on pg 48 53 ...
Page 53: ...Fig 5 Schematic Circuit Diagram 54 ...
Page 55: ...15029 15027 15028 Fig 7 ESH Mechanism with Cabinet Refer legend on pg 49 56 ...
Page 60: ...Disconnect the motor power supply 7 Fig 15 Motor 61 ...
Page 62: ...Fig 18 The Magnetic Actuator 63 ...
Page 63: ...Notes ...