【摘要】 为及时评估输电线路绝缘状态,保证系统稳定性,提出一种用于辨识输电线路绝缘的几种闪络方式的方法。首先,利用工频叠加冲击试验平台模拟3种输电线路故障类型,从而获得闪络电流数据;然后,对采集到的各种闪络电流信号进行小波变化得到各频带下的重构信号,并计算信号在各个频段内的能量;最后,利用小波能量谱构造高频段能量重心作为识别特征量,与低频段能量值结合提出综合识别判据,对三类诱因的多次试验数据进行分析辨别。结果表明:该文提出的方法可直观有效地识别工频叠加冲击下的污秽、覆冰及植被闪络,闪络原因判断正确率可达91.1%。更多还原

【Abstract】 In order to evaluate the insulation status of transmission line and ensure power system stability, a method is proposed to identify several flashover factors for the transmission line insulation in this paper. Firstly, the impact test platform superimposed by the power frequency is utilized to simulate three types of transmission line faults to obtain flashover current data. Secondly, the flashover current signals are transformed into reconstructed signals in different frequency band using the wavelet transformer. Finally, the wavelet energy spectrum is used to construct the high-frequency energy center of gravity as the identification feather, combined with the low frequency energy value to propose a comprehensive identification criterion. Furthermore, three types of inducement data are analyzed and distinguished. The results show that these three flashover under power frequency superimposed shocks-pollution, icing and vegetation flashover, can be accurately identified by the proposed method, and the correct identification rate can reach 91.1%.更多还原