【摘要】 污秽放电的极端结果是污闪,为提取反映绝缘子污秽放电发展的有效特征量,在实验室反复试验的基础上,利用分形理论提取绝缘子污秽放电过程中泄漏电流波形的分形维数和多重分形特征量,分析了4种不同污秽度下泄漏电流分形维数和多重分形谱的变化特性。结果表明污秽放电过程中分形维数的变化特征明显,分形维数的大小随污秽的加重呈整体下降的趋势;多重分形谱的谱宽Δa随污秽度的增大而增大。试验验证了泄漏电流的分形特征能有效预测绝缘子污秽的轻重,为污闪预警提供了新方法和新特征量。更多还原

【Abstract】 The extreme result of insulators contamination discharge is contamination flashover,in order to obtain effective characteristics of contamination discharge,we used the fractal theory to extract fractal dimension and multi-fractal characteristics of leakage current waveform by performing a number of experiments in the laboratory,and analyzed the change features of fractal dimension and multi-fractal spectrum of leakage current under four kinds of contamination degrees.It is found that variation characteristics of fractal dimension during contamination discharge are obvious,besides,fractal dimension values decrease integrally and spectrum width of multi-fractal spectrum increases as contamination degrees increase.The results show that fractal characteristics of leakage current can estimate insulator contamination degrees effectively.It is proved that the new methods can effectively predict the characteristic volume to contamination flashover.更多还原