On-line partial discharge(PD)diagnostics data are corrupted by various noise sources and this makes it more challenging to extract the PD signal contained in the raw data.Though the noise sources can be filtered out u...On-line partial discharge(PD)diagnostics data are corrupted by various noise sources and this makes it more challenging to extract the PD signal contained in the raw data.Though the noise sources can be filtered out using signal processing techniques,PDs from neighboring cables and other high voltage equipment make the de-noising process more difficult due to the similar features of these signals with the PD signal of interest.Proposed in this paper is a double-ended partial discharge diagnostic system with dual sensors at each end which uses wireless time triggering using global time reference with the aid of global positioning system(GPS).Using the time of arrival method based on the velocity of propagation on the data,PD pulses originating from other sources can be discarded which reduces the volume of data to be stored and would eventually also reduce the hardware and software requirements of the denoising process thereby improving de-noising efficiency.System design,laboratory tests and on-site measurements are discussed.展开更多
为了研究电缆局部放电模式识别中Weibull分布的应用,将10 k V,30 m长的XLPE(crosslinked polyethylene)电缆作为研究对象,设计四种典型的人工缺陷模型,分析其产生的放电脉冲信号,采用极大似然法估计信号的Weibull分布。结果表明,Weibul...为了研究电缆局部放电模式识别中Weibull分布的应用,将10 k V,30 m长的XLPE(crosslinked polyethylene)电缆作为研究对象,设计四种典型的人工缺陷模型,分析其产生的放电脉冲信号,采用极大似然法估计信号的Weibull分布。结果表明,Weibull概率分布跟局放幅值分布密切相关。因此可以根据其形状参数β值识别不同的放电类型。展开更多
基金the funding and technical support provided by Scottish Power Energy Networks (SPEN) for the research
文摘On-line partial discharge(PD)diagnostics data are corrupted by various noise sources and this makes it more challenging to extract the PD signal contained in the raw data.Though the noise sources can be filtered out using signal processing techniques,PDs from neighboring cables and other high voltage equipment make the de-noising process more difficult due to the similar features of these signals with the PD signal of interest.Proposed in this paper is a double-ended partial discharge diagnostic system with dual sensors at each end which uses wireless time triggering using global time reference with the aid of global positioning system(GPS).Using the time of arrival method based on the velocity of propagation on the data,PD pulses originating from other sources can be discarded which reduces the volume of data to be stored and would eventually also reduce the hardware and software requirements of the denoising process thereby improving de-noising efficiency.System design,laboratory tests and on-site measurements are discussed.
文摘为了研究电缆局部放电模式识别中Weibull分布的应用,将10 k V,30 m长的XLPE(crosslinked polyethylene)电缆作为研究对象,设计四种典型的人工缺陷模型,分析其产生的放电脉冲信号,采用极大似然法估计信号的Weibull分布。结果表明,Weibull概率分布跟局放幅值分布密切相关。因此可以根据其形状参数β值识别不同的放电类型。
