浅谈110 kV主变中性点放电间隙的作用

针对一起110 kV变压器跳闸事故进行短路计算，查询了110 kV变压器中性点氧化锌避雷器与放电间隙的配置原则，以及湖北电网雷电信息查询系统，经综合分析发现，当110 kV线路遭受雷击，雷电波从线路侵入110 kV变电站到达变压器中性点，产生较高雷电过电压时，避雷器没有达到动作条件，靠间隙击穿来保护变压器中性点绝缘。同时分析了氧化锌避雷器的动作条件，以及间隙被击穿的条件，表明主变压器中性点避雷器与棒间隙的配合使用可以有效保护变压器中性点绝缘。

Effect of 110 kV main transformer neutral point discharge gap

In allusion to a trip accident of 110 kV transformer, some calculations of short-circuit are made, thunderbolt information system of Hubei power network is researched, and the configuration of transformer neutral point discharge gap and zinc oxide lightning arrester is looked up. After analyzing, this paper finds that the neutral point discharge gap was discharged when there was high lightning overvoltage on the neutral point caused by the lightning strike. But the arrester did not work. In this instance , ...