CAJ | 학술논문

准确辨识输电线路雷击故障类型对于改进防雷设计、实现差异化防雷具有十分重要的意义，因此以雷击输电线路后三相导线暂态行波电流为研究对象，建立了基于小波能量谱的雷击故障识别方法。根据不同雷击情况下的小波能量谱分布特点，构建了相应特征量及故障识别判据。仿真结果表明，该方法不受雷电流参数及波形的影响，对于绕击未闪路、绕击闪路及反击三种雷击类型均能准确识别。通过合理选择判断阈值和电流行波监测点，可分别避免雷电冲击电晕及线路末端折反射波对算法准确性的影响，因此本方法具有较高的实用价值。
준학변식수전선로뢰격고장류형대우개진방뢰설계、실현차이화방뢰구유십분중요적의의，인차이뢰격수전선로후삼상도선잠태행파전류위연구대상，건립료기우소파능량보적뢰격고장식별방법。근거불동뢰격정황하적소파능량보분포특점，구건료상응특정량급고장식별판거。방진결과표명，해방법불수뇌전류삼수급파형적영향，대우요격미섬로、요격섬로급반격삼충뢰격류형균능준학식별。통과합리선택판단역치화전류행파감측점，가분별피면뇌전충격전훈급선로말단절반사파대산법준학성적영향，인차본방법구유교고적실용개치。
Accurate identification of lightning fault is of great significance for improving the transmission line lightning protection design. In this paper,the three-phase travelling wave current is studied. Based on the wavelet energy spectrum, a lightning fault identification method is established. According to the distribution characteristics of the wavelet energy spectrum for different lightning faults,the corresponding characteristic and fault identification criterion are constructed. The simulation results show that,the method is not affected by parameters and waveforms of lightning current models. It can distinguish accurately the three fault types,which are shielding failure without flashover,shielding failure with flashover and back flashover. By choosing the threshold and setting the detection point reasonably,it can respectively avoid the effect of lightning impulse corona and reflected wave at the end of the line on the accuracy of the method. Therefore,the method has high practical value.