高电压技术2012，Vol.38Issue(8)：1981-1987,7.
采用小波变换的绝缘子泄漏电流去噪
Insulator Leakage Current De-noising Using Wavelet Transform
摘要
Abstract
In order to de-noise the leakage current at the safety stage of the contamination insulators,we proposed a quantitative calculation method of the number of the decomposition levels when wavelet transform was used to denoise the leakage current.Based on the conclusions that details of a signal needed a threshold process while wavelet transform was used to de-noise the signal,and that the energy of the leakage current at the safety stage concentrated upon the low-frequency periodic components,a rule was proposed for judging the optimal number of the decomposition levels when wavelet transform was used to de-noise the leakage current.Thereby,a calculation formula of the optimal number of the wavelet decomposition levels was proposed and proved.The insulator leakage currents gathered in the high voltage experiment and in the field were de-noised with wavelet transform.The results show that,after selecting the same mother wavelet and the same threshold,the de-noising results with numbers of the decomposition levels from the formula proposed in this paper are superior to those with the other numbers of the decomposition levels.The conclusion can be drawn that,the value calculated by the proposed formula is the optimal number of the decomposition levels,moreover,after using this value,the de-noising is the most effective.关键词
绝缘子/泄漏电流/去噪/小波变换/细节/分解层数Key words
insulator/leakage current/de-noise/wavelet transform/detail/number of decomposition level分类
信息技术与安全科学引用本文复制引用
黄建才,朱永利..采用小波变换的绝缘子泄漏电流去噪[J].高电压技术,2012,38(8):1981-1987,7.基金项目
国家自然科学基金 （）
