摘要
超/特高压输电线路发生单相接地故障后,将采用单相自动重合闸。在合闸前区分瞬时性故障和永久性故障,对实现自适应重合,防止电力系统又一次遭受故障的冲击具有重要意义。超/特高压输电线路可分为带并联电抗器和不带并联电抗器两种方式,文中对两种方式下发生单相接地故障时故障相与非故障相之间的耦合进行了分析。线路不带并联电抗器时,瞬时性与永久性故障时故障相电压的本质区别为是否含有电容耦合电压,带并联电抗器时为恢复电压中是否含有自由频率分量。最后给出了1条750kV的输电线在MATLAB/SIMULINK平台上的仿真结果,验证了理论分析的正确性。
When a single-phase earth fault occurs in EHV/UHV transmission line,the single-phase reclosure will come into operation.It is very important for a single–phase adaptive reclosure to distinguish the temporary faults from permanent faults before the breaker is closed.The EHV/UHV transmission line can be divided into 2 types： with or without shunt reactors.This paper analyses the coupling between the fault phase and the non-fault phase when a single-phase earth fault occurs in the two types of transmission line.When the fault occurs in the line without shunt reactors,the essential difference between permanent and temporary fault voltage is whether it contains capacitive coupling or not.When the fault occurs in the line with shunt reactors,the essential difference is whether the fault voltage contains power frequency component.A 750kV transmission line is modeled by MATLAB /SIMULINK and the conclusion has been verified.
出处
《计算机仿真》
CSCD
2008年第9期252-255,共4页
Computer Simulation
基金
重庆市自然科学基金(CSTC,2006BB6220)
