断路器二次回路的几点问题及改进

Faults frequently found in secondary circuit of circuit breaker and improvements

对目前断路器二次回路存在的常见问题的产生原因进行了分析,提出了相应的改进措施:对分合闸线圈及出口接点烧毁问题,采取提高设备质量、完善机构功能,抑制分合闸线圈反电势和断路器拒动时设法断开分合闸回路措施;对储能行程开关烧毁问题,建议改进接线和使用单接点行程开关;对常励磁接触器线圈发热烧毁问题,采取在其启动后降低线圈工作电压的方法减少发热;对动作卡塞的接触器采用密封性能好的中间继电器代替,更换优质端子以保证接线可靠。

By studying faults frequently found in secondary circuit of circuit breaker,corresponding improvements are presented. For the burn-out of closing/tripping coil and output relay contact,it is proposed to improve component quality, to enhance operating mechanism, to suppress counter electromotive force of coil,and to open closing/tripping circuit when operating mechanism fails. For the burn-out of position switch contact,it is proposed to improve connections,and to use single contact position switches. For the burn-out of normal excitation coil of contactor,it is proposed to depress its working voltage after startup.. For the action failure of contactor,it is proposed to apply sealed interposing relay. For reliable connections ,it is proposed to use better terminal board.