摘要
操作过电压对某些设备的绝缘选择起着决定性作用,为了更好地进行电气设备的绝缘配合,指导生产运行和科学试验,事先就必须进行过电压的计算。本文以呼和浩特抽水蓄能电站-武川变电站500 KV输电线路为例,利用PSCAD软件对其进行合空线操作过电压和单相重合闸过电压仿真计算,创新性的定量分析了三相合闸同期性、不同期性、合闸相位、线路长度、避雷器和合闸电阻等影响过电压因素。为电气设备的绝缘水平、合闸电阻值和合闸相位的选取提供理论依据,为抑制操作过电压提供了的限制措施。对系统运行安全可靠性和工程试验具有指导意义。
Operating overvoltage plays a decisive role in the insulation selection of certain equipment. In order to better carry out the insulation coordination of electrical equipment, to guide the produc-tion operation and scientific experiment, it must be calculated in advance. In this paper, taking the Hohhot Pumped Storage Power Station-Wuchuan 500 kV substation transmission line as exampel, their overhead line operating over voltage and single-phase reclosing overvoltage are simulated calculated by software PSCAD, and the influence factors of three-phase switching over the same period, different period, closing phase, the length of transmission line, lightning arrester and the closing resistance are analyzed innovatively. The research results provide a theoretical basis for the selection of electrical equipment insulation level, closing resistance value and closing phase, and provide limiting measures to suppress the operation over voltage, and are of guiding significance for system operation safety reliability and engineering test.
