Abstract：The noise in the insulator leakage current influences the analysis for the leakage current greatly. The improved ITD(intrinsic time-scale decomposition) is proposed, which is fit to de-noise the leakage current. In this method the distance scale is introduced to solve the rotation mixing problem. It avoids the situation that each PRC(proper rotation component) contained the frequency of the others. The extension of the two ends is introduced to solve the end effect problem. When the improved ITD is used to de-noise the leakage current at the safety stage, the formula calculating the decomposition number is proposed, which avoids the blindness of the decomposition. Based on the wavelet threshold and the special characteristics of the improved ITD, the threshold and the de-noising process are given. This proposed method is applied on the de-noising of the leakage current gathered in the high voltage experiment. The result shows that the proposed de-noising method smoothes the leakage current signal effectively and keeps its feature components well, which is superior to the de-noising result of the original ITD.
黄建才, 朱永利. 基于改进固有时间尺度分解法的绝缘子泄漏电流去噪研究[J]. 电工技术学报, 2013, 28(1): 57-64.
Huang Jiancai, Zhu Yongli. Research on De-noising of Insulator Leakage Current Based on Improved Intrinsic Time-Scale Deposition. Transactions of China Electrotechnical Society, 2013, 28(1): 57-64.
[1] 李璟延, 姚陈果, 胡建林, 等. 染污绝缘子放电发展区段与污闪预警的实验研究[J]. 中国电机工程学报, 2008, 28(13): 8-14. Li Jinyan, Yao Chenguo, Hu Jianlin, et al. Experimental research on discharge development zones of contamination insulators and contamination flashover prewarning[J]. Proceedings of the CSEE, 2008, 28(13): 8-14. [2] 陈攀, 孙才新, 米彦, 等. 一种用于绝缘子泄漏电流在线监测的宽频带微电流传感器的特性研究[J]. 中国电机工程学报, 2005, 25(24): 144-148. Chen Pan, Sun Caixin, Mi Yan, et al. Research of broad bandwidth micro-current sensor character for insulator leakage current monitoring system[J]. Proceedings of the CSEE, 2005, 25(24): 144-148. [3] Pylarinos D, Siderakis K, Pyrgioti E, et al. Impact of noise related waveforms on long term field leakage current measurements[J]. IEEE Transactions on Dielec- trics and Electrical Insulation, 2011, 18(1): 122-129. [4] 赵汉表, 林辉, 廖胜蓝, 等. 小波变换在绝缘子泄漏电流检测中的应用[J]. 高电压技术, 2005, 31(4): 34-36. Zhao Hanbiao, Lin Hui, Liao Shenglan, et al. New method for leakage current detection of insulators based on wavelet transform[J]. High Voltage Engineering, 2005, 31(4): 34-36. [5] 贺博, 林辉. 基于泄漏电流的污秽绝缘子闪络风险预测[J]. 高电压技术, 2006, 32(11): 22-25. He Bo, Lin Hui. Method of flashover risk prediction for contaminated insulator based on leakage current [J]. High Voltage Engineering, 2006, 32(11): 22-25. [6] 赵汉表, 林辉, 谢利理, 等. 基于高压侧测量的输电线路绝缘子泄漏电流在线监测系统[J]. 电力系统自动化, 2004, 28(22): 78-82. Zhao Hanbiao, Lin Hui, Xie Lili, et al. On-line monitoring system on measuring leakage current near HV side for electrical transmission line insulators[J]. Automation of Electric Power Systems, 2004, 28(22): 78-82. [7] 李延, 司马文霞, 姚陈果, 等. 染污绝缘子安全区泄漏电流检测中去除信号干扰方法[J]. 电力系统自动化, 2008, 32(5): 85-89. Li Jingyan, Sima Wenxia, Yao Chenguo, et al. Application of de-noise methods used in monitoring leakage current in safety stage of contamination insulators[J]. Automation of Electric Power Systems, 2008, 32(5): 85-89. [8] 刘涤尘, 夏利民, 商志会. 自适应噪声对消应用于高压绝缘子泄漏电流检测的研究[J]. 武汉大学学报(工学版), 2001, 34(4): 96-99. Liu Dichen, Xia Limin, Shang Zhihui. Study of adaptive noise cancellation used in measuring HV insulator’s leakage current[J]. Engineering Journal of Wuhan University, 2001, 34(4): 96-99. [9] 孙金宝, 朱永利, 刘丽轻, 等. 基于EMD的绝缘子泄漏电流去除噪声研究[J]. 华北电力大学学报, 2010, 37(6): 1-5, 22. Sun Jinbao, Zhu Yongli, Liu Liqing, et al. Study on de-noising method based on EMD used in insulator leakage current[J]. Journal of North China Electric Power University, 2010, 37(6): 1-5, 22. [10] 杨建明. 污秽绝缘子泄漏电流监测系统的设计[D]. 北京: 北京交通大学, 2008. [11] 姚陈果, 毛峰, 匡红刚, 等. 输电线路绝缘子泄漏电流的句法模式识别[J]. 高电压技术, 2010, 36(6): 1487-1493. Yao Chenguo, Mao Feng, Kuang Honggang, et al. Syntactical pattern recognition for leakage current of transmission line insulators[J]. High Voltage Engineering, 2010, 36(6): 1487-1493. [12] Huang N E, Zhang S, Long S R. The empirical mode decomposition and the Hilbert spectrum for nonlinear and non-stationary time series analysis[J]. Proceedings of the Royal Society A, 1998, 454: 903-995. [13] Frei M G, Osorio I. Intrinsic time-scale decompo- sition: time-frequency-energy analysis and real-time filtering of non-stationary signals[J]. Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2007, 463: 321-342. [14] Wu Z, Huang N E. Ensemble empirical mode decomposition: a noise-assisted data analysis method [J]. Advances in Adaptive Data Analysis, 2009, 1(1): 1-41. [15] 顾小昕. 基于固有时间尺度分解的信号分析与干扰抑制技术研究[D]. 西安: 西安电子科技大学, 2010. [16] 李雪. 基于固有时间尺度分解的数字调制识别[D]. 西安: 西安电子科技大学, 2010. [17] 姚陈果, 李璟延, 米彦, 等. 绝缘子安全区泄漏电流频谱特征提取及污秽状态预测[J]. 中国电机工程学报, 2007, 27(30): 1-8. Yao Chenguo, Li Jingyan, Mi Yan, et al. Abstracting frequency spectrum characteristics of insulators leakage current in safety zone to forecast the contamination condition[J]. Proceedings of the CSEE, 2007, 27(30): 1-8. [18] Suda T. Frequency characteristics of leakage current waveforms of a string of suspension insulators[J]. IEEE Transactions on Power Delivery, 2005, 20(1): 481-487. [19] Kordkheili H H, Abravesh H, Tabasi M, et al. Determining the probability of flashover occurrence in composite insulators by using leakage current harmonic components[J]. IEEE Transactions on Dielec- trics and Electrical Insulation, 2010, 17(2): 502-512. [20] 司马文霞, 李璟延, 孙才新. 染污绝缘子污闪全过程泄漏电流波形及谐波特性分析[J]. 高电压技术, 2010, 36(5): 1101-1106. Sima Wenxia, Li Jingyan, Sun Caixin. Development on the frequency domain of leakage currents during discharge detection for contamination insulators[J]. Hign Voltage Engineering, 2010, 36(5): 1101-1106. [21] 蔡炜, 余涛, 刘云鹏, 等. 500kV线路长串绝缘子的冰闪泄漏电流[J]. 高电压技术, 2009, 35(10): 2535-2539. Cai Wei, Yu Tao, Liu Yunpeng, et al. Icing flashover leakage current of long insulator strings in 500kV transmission line[J]. High Voltage Engineering, 2009, 35(10): 2535-2539. [22] Du B X, Liu Y, Liu H J. Recurrent plot analysis of leakage current for monitoring outdoor insulator performance[J]. IEEE Transactions on Dielectrics and Electrical Insulation, 2009, 16(1): 139-146.
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