真空断路器快速合-分闸操作10kV并联电容器的过电压机理  

Mechanism of Overvoltage Induced by Fast Switching On-off 10 kV Shunt Capacitors Using Vacuum Circuit Breakers

作　　者：杨庆[1] 欧阳沙[1] 司马文霞[1] 席世友[2] 康鸿飞[2] 杨鸣[1] 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030 [2]重庆市电力公司,重庆401420

出　　处：《高电压技术》2014年第10期3135-3140,共6页High Voltage Engineering

基　　金：国家重点基础研究发展计划(973计划)(2009CB724504)~~

摘　　要：近年来变电站投切10 kV并联电容器时发生的断路器炸裂事故率不断上升,对此类事故进行了详细的统计后发现近50%的事故中都出现了断路器合闸后快速分闸的操作。就此,率先对并联电容器的快速合-分闸操作进行了概念定义,并对其过程中过电压产生的机理进行了理论推导。同时,提出了暂态回路重构、母线对地电容突变等观点。借助ATP-EMTP软件,对快速合-分操作过电压进行了大量仿真计算。研究表明:快速合-分闸操作会在断路器负载侧产生极高的过电压;对地电容起到了重构振荡回路的作用,改变了操作暂态过程的发展;断路器触头电流高频过零后出现等效截流的现象。仿真计算操作过电压标幺值高达8.5,此操作极有可能引发断路器重燃甚至绝缘击穿。Accidents grow frequently in 10 kV power systems in recent years when using vacuum breaker to switch shuntcapacitors. Preliminary statistics indicates nearly 50% of these accidents occurred with operation of fast switching on-off.Hence after defining this specific operation of breaker firstly, we theoretically derived the mechanism of overvoltage gen-eration in the operation and proposed some ideas including reconfiguration of transient circuit and fluctuation ofbus-ground capacitance. Then we calculated this overvoltage using ATP-EMTP. Some patterns of the overvoltage are ob-tained from the calculations： the operation of fast switching on-off shunt capacitors will induce high overvoltage on loadside of circuit breaker; the reconfiguration of oscillating circuit induced by ground capacitance impacts the transientprocess of operation greatly; with an operation overvoltage up to per unit value of 8.5, an operating breaker would beprobably reignited or even broken down.

关 键 词：并联电容器 真空断路器 快速合-分闸操作 过电压 对地电容 ATP-EMTP仿真 

分 类 号：TM561.2[电气工程—电器]