主变压器通风电源切换故障率高的原因分析

Causes analysis on high failure rate of ventilation power source switching for main transformer

针对国电大武口热电有限责任公司3号主变压器通风电源切换故障率高的问题进行分析,找出故障原因并对3号主变压器通风电源回路进行了改造。结果表明:主变压器强制通风联锁条件不可靠、联锁回路辅助接点接触不良、交流电源开关与低压脱扣线圈机械配合不好是引发故障的原因。通过主变压器联锁回路的改造和更换部分设备,大大提高了3号主变压器通风电源切换的可靠性,收到了良好的效果。

Analyzes the problems of high failure rate of ventilation power source switching for No.3main transformer in Dawukou Thermal Power Co.,Ltd.,finds out the failure cause and rebuilds the ventilation power source circuit of No.3 main transformer. The result shows that： the main transformer forced ventilation interlocking condition is unreliable,interlocking circuit auxiliary contacts appear poor contact and AC mains switch does not mate well with low-voltage trip coil are causes of solicitation the failure.Through improving interlocking circuit of main transformer and replacing partial equipments,promotes the switching reliability of ventilation power sources of No.3main transformer and obtains better effect.