CAJ | 학술논문

针对国内35 kV与20 kV系统真空断路器开断并联电抗器系统事故多发情况，开展35 kV系统工况下的现场试验，分析了开断后的暂态过程及过电压的机理，并在实验室进行了20 kV系统真空断路器在额定电流下投切电抗器的截流试验，研究截流值和过电压规律。结果表明：截流过电压幅值远小于重燃过电压，多次重燃过电压是真空断路器开断并联电抗器频繁出现高过电压的主要原因；在系统典型额定工况下，300 A负载电流下的截流值比100 A负载电流下小，真空断路器的截流值随着开断电流的增大而减小的理论在系统额定电流下同样成立。
침대국내35 kV여20 kV계통진공단로기개단병련전항기계통사고다발정황，개전35 kV계통공황하적현장시험，분석료개단후적잠태과정급과전압적궤리，병재실험실진행료20 kV계통진공단로기재액정전류하투절전항기적절류시험，연구절류치화과전압규률。결과표명：절류과전압폭치원소우중연과전압，다차중연과전압시진공단로기개단병련전항기빈번출현고과전압적주요원인；재계통전형액정공황하，300 A부재전류하적절류치비100 A부재전류하소，진공단로기적절류치수착개단전류적증대이감소적이론재계통액정전류하동양성립。
As overvoltage failures frequently occur in vacuum circuit breakers switching-off shunt reactors of 35 kV or 20 kV power sys-tem, thefield tests were carried out in the operating condition of 35 kV power system. This paper analyzed the transient process caused by the opening operation and the overvoltage mechanism.The chopping current test of vacuum circuit breaker switching off shunt reactors was carried out under rated current condition in the laboratory. This paper researched the chopping current value and the overvoltage regulation. The results show that the overvoltage of chopping current is much smaller than multiple reignition overvoltage, and multiple reignition over-voltage is the main reason of overvoltage failures of vacuum circuit breakers switching-off shunt reactors. In the typical conditions of power system, the chopping current of 300 A load current is smaller than that of 100 A load current. The theory that the chopping current value of vacuum circuit breakers decreases with the increase of breaking current is completely true at rated high current.