双断口真空断路器开断特性的试验与仿真研究

发布时间：2018-01-17 03:12

本文关键词：双断口真空断路器开断特性的试验与仿真研究　出处：《高电压技术》2014年08期 　论文类型：期刊论文

【摘要】：为分析双断口真空断路器的开断特性,建立了双断口真空断路器的合成开断试验平台和基于一种改进真空电弧模型的电磁暂态仿真平台。对开断电流、电弧电压、燃弧时间和瞬态恢复电压(transient recovery voltage,TRV)分配比例等参数进行了试验测量,通过仿真诊断等离子体参数,对试验结果进行了机理分析。结果表明:过长的燃弧时间会导致过大的燃弧能量和转移电荷,可能使电弧发生集聚;高压断口的延迟分闸会造成弧后残余等离子体特性的差异,从而加剧双断口真空断路器TRV分配的不均匀性;这2种情况均不利于开断。此外,双断口真空断路器均压电容的取值除了考虑TRV均匀分布外,还应兼顾弧后阴极表面电场分布的一致性,过大的均压电容反而不利于开断。因此,燃弧时间及其同步控制和合理均压电容值的选取是双断口真空断路器成功开断的关键。
[Abstract]:In order to analyze the breaking characteristics of double break vacuum circuit breakers, a synthetic test platform for double break vacuum circuit breakers and an electromagnetic transient simulation platform based on an improved vacuum arc model are established. The parameters such as arc voltage, arc ignition time and transient recovery voltage distribution ratio are measured experimentally. Through the simulation diagnosis of plasma parameters, the mechanism of the experimental results is analyzed. The results show that the excessive arc burning time will lead to excessive arc energy and transfer charge, which may lead to the accumulation of the arc. The delay opening of high voltage fracture will result in the difference of residual plasma characteristics behind the arc, which will aggravate the non-uniformity of TRV distribution in double fracture vacuum circuit breaker. In addition, in addition to considering the uniform distribution of TRV, the uniformity of electric field distribution on the surface of the back-arc cathode should be taken into account. Therefore, the time of arc burning and its synchronous control and the selection of reasonable voltage-sharing capacitance are the key to the successful opening of double-break vacuum circuit breaker.
【作者单位】：武汉大学电气工程学院;
【基金】：国家“十一五”科技支撑计划(2009BAA19B05)~~
【分类号】：TM561.2
【正文快照】： 0引言1目前,在110 kV及以上电压等级的电力系统中,SF6断路器占主导地位。然而,SF6气体是主要的温室效应气体之一,已被《京都议定书》限制使用,故研究可替代SF6断路器的环保型高压断路器日益紧迫[1-3]。真空断路器采用真空作为绝缘和灭弧介质,具有熄弧能力强、体积小、重量轻、

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