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This paper describes an investigation of grease degradation of aged GCBs. Risk of depletion on conducting contacts due to grease degradation in particular was identified in field data. In addition, it was found that grease oil evaporation and abrasion dust infiltration were proportional to ages and numbers of operations respectively. It was also found that grease degradation promoted abrasion in silver-plating...
The internal inspection for a GCB (gas circuit breaker) is regularly performed to check and change contact parts in the case that the number of times of fault current breaking reaches a specified number, because TBM (time based maintenance) criteria is generally applied. Our new system, however, can change maintenance criteria to CBM (condition based maintenance). Current interval for internal inspection...
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