6kV磨煤机断路器拒分原因分析及处理

Analysis and Treatment of Breaker Open Failure of 6 kV Coal Pulverizer

某电厂2号机组1号磨煤机6 kV断路器出现拒分的异常现象。通过检查和分析,发现该断路器拒分的原因是分闸掣子半轴的定位销脱落,致使半轴向左位移,导致断路器无法分闸。通过拆开断路器前盖板,用验电器远距离击打分闸掣子半轴上的传动铁片,使断路器成功分闸。针对断路器此类故障提出防范措施及建议。

The abnormal open failure phenomenon of the 6 kV breaker of No.1 coal pulverizer of No.2 unit in a power plant has happened. After the inspection and analysis, it is found that the drop of the locating pin of the semi shaft of the opening detent is the reason, which led to left shift of the semi shaft and thus led the break unable to trip. The breaker was tripped successfully by opening the front cover board of the breaker and hitting the transmitting iron plate of the semi shaft of the opening detent by electroscope from a long distance. Preventive measures and suggestions on such kind of breaker fault are proposed.