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
Polymeric insulation is a critical component of high voltage systems.However,exposure to high electric stress can cause partial discharges(PDs)to occur and may result in the deterioration of insulation and lead to die...Polymeric insulation is a critical component of high voltage systems.However,exposure to high electric stress can cause partial discharges(PDs)to occur and may result in the deterioration of insulation and lead to dielectric failure.These PD events are accompanied by the production of acoustic pressure impulses in the polymer.Detection of these acoustic pressure impulses can reveal the presence of PDs and locate their source.However,analysing the detected acoustic emission(AE)signal is challenging.The acoustic pressure source's nature and the propagating medium's properties,such as density,viscosity,and elasticity,significantly affect the propagating AE signal.The effects of the hardness of the polyurethane(PU)on the propagating AE signal are reported by the authors based on results obtained from laboratory experiments.It was observed that the decay rate in the magnitude of the acoustic impulse was high in PU at all hardness levels following an exponential behaviour.The analysis of the frequency spectra indicates that the higher frequency components attenuate more strongly with distance.These laboratory results can be valuable for engineers and industries as they provide valuable insight into how the physical characteristics of a material affect the propagation characteristics of AE signals during the detection and location of PD source using the AE detection technique.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Polymeric insulation is a critical component of high voltage systems.However,exposure to high electric stress can cause partial discharges(PDs)to occur and may result in the deterioration of insulation and lead to dielectric failure.These PD events are accompanied by the production of acoustic pressure impulses in the polymer.Detection of these acoustic pressure impulses can reveal the presence of PDs and locate their source.However,analysing the detected acoustic emission(AE)signal is challenging.The acoustic pressure source's nature and the propagating medium's properties,such as density,viscosity,and elasticity,significantly affect the propagating AE signal.The effects of the hardness of the polyurethane(PU)on the propagating AE signal are reported by the authors based on results obtained from laboratory experiments.It was observed that the decay rate in the magnitude of the acoustic impulse was high in PU at all hardness levels following an exponential behaviour.The analysis of the frequency spectra indicates that the higher frequency components attenuate more strongly with distance.These laboratory results can be valuable for engineers and industries as they provide valuable insight into how the physical characteristics of a material affect the propagation characteristics of AE signals during the detection and location of PD source using the AE detection technique.
