摘要
电容器组作为电力系统重要无功补偿设备之一,通常采用真空断路器对其进行投切。当真空断路器在开断电容器组发生重击穿时会产生过电压。产生的过电压可能会对真空断路器、电容器组或其他电气设备产生威胁。根据实际运行情况,真空断路器通常被用于无功补偿回路的电缆系统中,因此系统中存在的寄生电容不可避免的参与了真空断路器开合电容器组的过程。文中结合变电站中典型的补偿回路,分析了寄生电容的分布对真空断路器开断电容器组产生过电压的影响。通过实验室实施的等价性试验,证明了电源侧和负载侧寄生电容支路电流的存在,且此电流表现为高频、高幅值。在此情况下,获得了真空断路器开断电容器组发生重击穿时的过电压波形和数据。结果表明,由于补偿回路寄生电容的存在对真空断路器开合电容器组产生的过电压是有影响的。因此寄生电容的存在在真空断路器开合电容器组的过电压分析中应予以考虑。
Capacitor banks is one of the important reactive power compensation installaton in power system. Usually vacuum circuit breaker is used for switching such installation. It will produce the overvohage when the restrike occurs in the vacuum circuit breaker opening capacitor banks. The overvoltage may damage vacuum circuit breakers, capacitors or other electrical equipment. With actual operation, the vacuum circuit breaker is usually used in the cable system for reactive power compensation circuit.So the existence of the parasitic capacitance in the system will inevitably involved in the process of the vacuum circuit breaker switching capacitor banks. In this paper, combined with thesubstation,the distribution of the parasitic capacitance is analyzed for breaker opening capacitor banks when the overvoltage appears. Through typical compensation circuit in the impact of the vacuum circuit the equivalent experiment carried out in the laboratory, it is proved that the parasitic capacitance branch current for the power side and load side has been existed .The branch current is of high frequency and high amplitude. In this case, the overvohage waveforms and data have been obtained when the restrike occurs in the vacuum circuit breaker opening capacitor banks. The results show that, due to the existence of the parasitic capacitance for compensation circuit , which has influence on the overvoltage of vacuum circuit breaker switching capacitor banks. So, the parasitic capacitance should be considered in the overvoltage analysis of vacuum circuit breaker switching capacitor banks.
出处
《高压电器》
CAS
CSCD
北大核心
2017年第6期135-140,共6页
High Voltage Apparatus
关键词
真空断路器
电容器组
暂态过程
过电压
寄生电容
vacuum circuit breaker
capacitor banks
transition process
over-voltage
parasitic capacitance
