【摘要】 针对接地极引线的双极运行模式,利用脉冲反射法进行故障测距,分析脉冲信号在接地极引线上的传播特性,以及引线上可能出现的各种故障。以PSCAD为仿真平台,建立高压直流系统模型,模拟各种故障,并利用MATLAB进行数据处理与提取。对比分析不同故障类型下故障暂态行波与脉冲电压、电流反射行波信号,分别通过电压、电流波形求取故障距离,以求平均的方式得出最终测距结果。仿真结果表明脉冲反射法对接地极引线故障能够实现准确定位,此方法比故障暂态行波测距法应用范围广,波形辨识度高,测距精度高。更多还原

【Abstract】 Aiming at the bipolar operation mode of the grounding wire, the pulse injection method for fault location is used.Propagation characteristics of the pulse signal and various faults that may occur on the grounding wire are analyzed. Based on PSCAD simulation platform, the high voltage DC system model is established to simulate all kinds of faults, and the data of simulation results are processed and extracted by MATLAB.Comparing among signals of the fault transient traveling wave, the impulse voltage and the current reflected traveling wave, the fault distance is obtained through the voltage and current wave,and the final result is got in an average way.Simulation results show that this method has wider range of application, higher waveform recognition degree and higher ranging accuracy compared to the transient traveling wave ranging method.更多还原