一起换流变阀侧套管升高座重瓦斯动作原因分析

在已经投入运行的换流站中,换流变压器的非电气量保护在换流变压器保护中占有重要地位。通过介绍某±660 kV换流站换流变压器阀侧套管升高座重瓦斯保护动作的经过,利用现场收集的换流变非电量保护及保护暂态故障录波对故障进行分析,同时对一、二次设备进行事故后的检查和试验,得出此次故障的主因是瓦斯继电器行程较小引起的误动,并提出了相应的预防和改善措施。

Cause analysis on heavy gas operation in the high seat for a converter transformer valve side bushing

Non-electrical protection of converter transformer plays an important role in converter transformer protection in converter stations that have been put into operation. The operation process of heavy gas protection for the riser of the valve side bushing of converter transformer in a (±660 kV) converter station was introduced. The fault was analyzed by using the non-electric current protection of converter transformer collected on site and the transient fault recording of protection. At the same time, the inspection and test of the first and second equipment after the accident was carried out. It was concluded that the main cause of this fault was the misoperation caused by the smaller stroke of gas relay, and the corresponding prevention and improvement measures were put forward.