【摘要】 线路故障后产生大量的暂态分量,会影响常规保护的动作性能。利用分布参数等值超高压长距离输电线路,重点分析了过渡电阻对暂态高频分量的影响,分别讨论了相间短路和接地故障时,暂态高频分量与过渡电阻之间的关系。理论分析表明:故障暂态高频分量在频域上表现为一系列固有频率的形式,固有频率受过渡电阻的影响,固有频率的衰减系数与过渡电阻成反比,接地故障时,暂态高频分量中频率最低者与过渡电阻无关,只与电源侧反射系数和线路长度有关。利用PSCAD进行了仿真验证,仿真结果与理论分析相符。更多还原

【Abstract】 The transient component generated by faults of transmission line affects the performance of protection.Distributed parameter model is used to express EHV transmission lines and impact of fault resistance for transient component is analyzed.The relation between transient component and fault resistance is discussed.Theory analysis shows that the fault component is a series of natural frequencies in frequency domain,when grounding fault occurred,the lowest one of natural frequencies does not impact by fault resistance and the attenuation coefficient increase with fault resistance.Simulation is carried out on PSCAD system with 1000kV power system.更多还原