40.5kV投切电容器组用双断口真空断路器的研究  

Research on 40.5 kV Two-break Vacuum Circuit Breaker for Switching Capacitor Banks

作　　者：耿英三[1] 陈榆秀 孙超[1] 闫静[1] 颜莉萍[3] 秦成伟 王荃 

机构地区：[1]西安交通大学电力设备电气绝缘国家重点实验室,西安710049 [2]麦克奥迪(厦门)电气股份有限公司,福建厦门361101 [3]西安高压电器研究院有限责任公司,西安710077 [4]山东泰开真空开关有限公司,山东泰安271000 [5]陕西宝光真空电器股份有限公司,陕西宝鸡721006

出　　处：《高压电器》2016年第8期24-28,共5页High Voltage Apparatus

基　　金：国家重点基础研究发展计划(973计划)项目(2015CB251002);国家自然科学基金资助项目(51377127)~~

摘　　要：针对40.5 k V真空断路器投切电容器组时重击穿概率高这一亟待解决的技术难题,利用串联断口技术实现电容器组电流开合,提出了40.5 k V双断口真空断路器的设计方案并进行了深入研究,以满足电力系统的要求。建立了由高频涌流振荡回路和工频振荡回路组成的容性电流开合试验回路,在试验样机上完成了多组背对背电容器组开合试验,表明双断口真空断路器可显著降低投切电容器组时的重击穿概率。采用合成试验方法对该样机进行了短路电流开合试验,表明双断口真空断路器具有足够的短路开断能力。为保证每个断口的工作负荷相近,对并联均压电容数值的选取进行了试验研究并确定了样机的优选值为400 p F。因此,文中提出的用于投切电容器组的40.5 k V双断口真空断路器设计方案是完全可行的。Restrike during interrupting capacitor banks with vacuum circuit breakers may lead to severe switching overvoltage. Reducing the probability of restrike during capacitive current breaking is the ultimate solution to suppress overvohage. In this paper, a new design of vacuum circuit breaker with a very low probability of restrike was proposed based on the analysis of restrike mechanism. A two-break vacuum circuit breaker was presented to carry out the duty of capacitor bank switching, and further meet the requirement of power system. A capacitive current switching test circuit has been designed, which consists of a high frequency inrush current circuit and a power frequency circuit, to perform back-to-back capacitor banks switching test. The test result shows that two- break vacuum circuit breakers can reduce the probability of restrlke significantly. Short-circuit making and breaking capacity of the vacuum circuit breaker was validated by synthetic test. The optimum value of the shunt grading capacitor is 400 pF to ensure the stress of each break is approximately equal. So the design scheme of 40.5 kV two-break vacuum circuit breaker for switching capacitor banks is completely feasible.

关 键 词：双断口真空断路器 投切电容器组 重击穿 合闸涌流 均压电容 

分 类 号：TM561.2[电气工程—电器]