摘要
本文针对断路器重击穿过电压对电容器组的危害展开研究,通过建立35 kV并联电容器装置的EMTP仿真模型,验证理论与建模的正确性,对比分析正常切除及单相、两相、三相重击穿,在有无避雷器时的过电压特性。结果表明,无避雷器时,正常切除时电容器组两端间最大过电压1.366 p.u.,单相重击穿时相对地最大过电压5.18 p.u.,两相、三相重击穿时极间过电压分别是2.34 p.u.、2.53 p.u.;有避雷器可将相对地过电压限制在约3 p.u.以下,但无法抑制极间过电压。结合标准的相关要求,提出投切断路器应满足C2-M2级,10 kV及以下建议采用经老炼的真空断路器或接触器,35 kV及以上建议采用SF_(6)断路器或负荷开关,以降低重击穿的风险,为设备的选型及安全运行提供依据。
In this paper,the hazards of circuit breaker restrike overvoltage to capacitor banks is studied.The correctness of theory and modeling is verified by setting up EMTP simulation model of 35 kV shunt capacitor device.The overvoltage characteristics in case of normal switching,single-phase,two-phase and three-phase restrik as well as with and without surge arresters are compared and analyzed.The results show that in case of no arresters,the maximum voltage across the capacitor bank during normal switching is 1.366 p.u.;the maximum overvolatge of phase to ground during single phase reclosing is 5.18 p.u.;the overvoltage between poles during two-phase and three-phase restrike is 2.34 p.u.and 2.53 p.u.respectively.With arresters,phase-to-ground overvoltages are limited below approximately 3 p.u.,but overvoltage between poles remains uncontrolled.Based on relevant standards,it is proposed that circuit breakers for capacitive switching should meet class C2-M2 requirements.For 10 kV and below,it is recommended to use aged vacuum circuti breaker or contactor.While for 35 kV and above,SF_(6) circuit breakers or load switches are recommended to minimize the risk of restrike and provide a basis for the selection of equipment and its safe operation.
作者
赵彦军
雷乔舒
王国喜
高扬
魏文文
ZHAO Yanjun;LEI Qiaoshu;WANG Guoxi;GAO Yang;WEI Wenwen(Wuxi Sunking Power Capacitor Co.,Ltd.,Jiangsu Wuxi 214100,China)
出处
《电力电容器与无功补偿》
2026年第1期18-27,共10页
Power Capacitor & Reactive Power Compensation
基金
国家重点研发计划(2021YFB2401504)。
