220kV变电站主变压器重瓦斯保护动作事故分析

Analysis of Malfunction Accident in Heavy Gas Protection of Main Transformer in 220 kV Substation

针对某220 kV变电站主变压器重瓦斯保护受到110 kV线路保护故障干扰的误动行为,详细介绍了事故的经过,充分利用从该变电站收集到的包括线路保护装置、主变压器非电量保护装置以及故障录波装置的录波报告,对主变压器重瓦斯保护、110 kV线路保护的动作时序和故障录波报告进行详细分析,同时通过对一、二次设备进行事故后细致检查、试验,得出了造成此次主变压器重瓦斯保护误动的主要原因,提出了相应的防范和整改措施。分析过程具有一定的借鉴价值。

According to the malfunction of heavy gas protection of one 220 kV main transformer caused by the interference of one 110 kV line protection malfunction,the process of the accident is introduced in detail.Using the recording reports of line protection device,non-electricity protection device of main transformer and fault recorder collected from the substation,the heavy gas protection of main transformer,time sequence of 110 kV line protection actions and the fault recorder report are analyzed in detail.The primary equipment and secondary equipment are also inspected and tested carefully after the malfunction.Then,the main reasons that caused the malfunction of heavy gas protection are given,and the relevant prevention measures and solutions are presented.The analysis process has some value for reference.