摘要
相比于无串补的超高压输电线路,串联补偿超高压输电线路的潜供电流中含有低频率振荡分量。由于这些频率的存在,使得潜供电流的过零次数减少,不利于潜供电弧的自熄。建立了一个750kV超高压输电线路串补模型,并在Matlab中进行仿真分析。仿真结果表明,当线路发生单相接地故障,在线路保护启动断路器跳闸时,同时合闸故障相的旁路断路器,以旁路对应的串补电容,将会有效降低潜供电流,有利于提高单相重合闸的成功率。
Series compensated EHV transmission lines have low frequency oscillation component comparing with those of line without series compensation. The existence of these frequency decreases the number of secondary current crossing - zero, it is detrimental to the self - extinguishing of secondary arc current. This paper establishes EHV line series com- pensation model of 750kV, and simulate and analyze this model using matlab. The simulation results show that when the line single - phase ground fault occurs,line protection starts circuit breakers tripped, at the same time closes the bypass breaker of the fault phase, so series compensation capacitor is bypassed, it will effectively reduce the secondary arc current, and help improve the success rate of single -phase reclosing
出处
《电气开关》
2012年第3期56-59,共4页
Electric Switchgear
关键词
潜供电流
串联补偿
重合闸
仿真
secondary arc current
series compensation
reclose
simulation
