带分闸电阻断路器开断失步故障分析与研究  

Analysis and Study on Out-Of-Phase Fault of Circuit Breaker’s Break-Off with Opening Resistance

作　　者：那虎 李亚梅 魏志勇 李伟昭 姚莉 姚斯立[2] 

机构地区：[1]中机国际(西安)技术发展有限公司,陕西西安710054 [2]西安高压电器研究院有限责任公司,陕西西安710077

出　　处：《电工电气》2011年第12期13-18,共6页Electrotechnics Electric

摘　　要：对带分闸电阻的1100kV断路器的失步故障开断的过程进行研究。由于分闸电阻的存在,在开断过程中不可避免的改变了回路的特性参数,使得主辅断口承受了不同的瞬态恢复电压(TRV),通过等效模拟电路建立数学模型进行分析计算及PSCAD程序仿真,并同实际电网参数的模拟计算进行比较,结果表明:如果电网的实际参数较标准参数而言,在失步电流较小、上升率较低的情况下,对于带分闸电阻的断路器,在开断失步故障的条件下,辅助断口所要承受的TRV参数甚至可能比无分闸电阻断路器所承受的TRV还要苛刻,故需根据电网特性来选择是否使用带分闸电阻的断路器。Study was carried out for process of out-of-phase fault of 1 100 kV circuit breaker＇s break-off with opening resistance. Due to the existing of opening resistance, in break-off process the characteristics parameters of feedback circuit were unavoidably changed, so as to make primary and auxiliary fractures to bear different transient recovery voltage （TRV）. The math model was built via the equal effect analog circuit. This paper analyzed PSCAD program simulation and calculated the parameters of the model, comparing with analog calculation of actual grid parameters. The result shows that so far as actual parameters of grid compared with standard parameters, under the conditions of break-off out-of-phase fault with smaller out-of-phase current, lower rising rate, as for circuit breakers with opening resistance, the auxiliary fracture born TRV parameters would be even more strict than circuit breakers without opening resistance, therefore there is a need to select circuit breakers with opening resistance according to grid characteristics.

关 键 词：失步故障 1 100 KV断路器 分闸电阻 主辅断口 瞬态恢复电压 数学模型 PSCAD程序仿真 

分 类 号：TM561[电气工程—电器]