摘要
针对一起110kV变压器跳闸事故进行短路计算,查询了110kV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110kV线路遭受雷击,雷电波从线路侵入110kV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。
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 , discharge gap protected the insulation of main transformer neutral point. At the same time, this paper analyzes the acting qualification of neutral point discharge gap and zinc oxide lightning arrester, and it has proved that neutral point discharge gap tied in zinc oxide lightning arrester of transformer neutral point could he efficacious to protect the insulation of main transformer neutral point.
出处
《电力系统保护与控制》
EI
CSCD
北大核心
2010年第7期139-141,共3页
Power System Protection and Control
关键词
短路计算
雷电过电压
放电间隙
氧化锌避雷器
变压器中性点绝缘
calculation of short circuit
lightning overvoltage
discharge gap
zinc oxide lightning arrester
insulation of main transformer neutral point
