Extraction and Counting of Partial Discharges under Pulse Voltage
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摘要: 提出了脉冲电压下局部放电(PD)信号的提取和统计方法.通过相关系数分析选择dB6和dB2小波包函数,以滤除高低频干扰信号.通过分析脉冲电压下局部放电特征,选择合适的相位开窗,以消除局部放电的振荡信号.根据实际局部放电信号的采样频率、采样长度和脉冲电压过零点,定义脉冲电压的相位,并进一步研究各种相位相关图谱(如-n图和-q-n图等).实验结果表明,基于小波包的提取方法和脉冲电压下的相位统计方法对脉冲电压下的局部放电分析是有效的.Abstract: The extraction and counting method for partial discharge(PD) under pulse voltage was proposed.dB6 and dB2 wavelet packages were used to filter high and low frequency interferences respectively based on an analysis on correlation coefficient between simulation signals and extracted signals.A phase window was used to remove oscillating signals of PDs generated by sensors according to the characteristics of PDs under pulse voltage.PD phases were defined based on sampling rate,sampling length and zero-crossing of pulse voltage to analyze phase resolved patters(e.g.,-n and -q-n plots) under pulse voltage.Experiment results indicate that the proposed methods are effective for extraction and counting of PDs.
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Key words:
- pulse voltage /
- partial discharge /
- counting /
- wavelet package /
- correlation coefficient
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