Topic
Partial discharge
About: Partial discharge is a research topic. Over the lifetime, 13997 publications have been published within this topic receiving 102058 citations. The topic is also known as: PD.
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TL;DR: In this paper, a particle charging and detachment into a compressed SF6 coaxial electrode gap energized with high direct voltage have been investigated using the charge simulation technique and dimensional analysis.
Abstract: Conducting particle charging and detachment into a compressed SF6 coaxial electrode gap energized with high direct voltage have been investigated using the charge simulation technique and dimensional analysis.
40 citations
TL;DR: In this article, the authors measured the severity of PD defects using UHF method in gas-insulated switchgear (GIS) and the GIGRE method for the verification of sensitivity.
Abstract: The measurement of partial discharge (PD) using ultra-high frequency (UHF) method is considered an effective approach to monitor the online condition of the equipment, which is used to facilitate the detection of incipient defects in gas-insulated switchgear (GIS). In this paper, in order to assess the severity of PD defects using UHF method, the actual 220-kV GIS were subjected to experimentation. The PD was measured simultaneously by using the UHF method and the IEC60270 measurement technique. The combined measurement has been carried out on different defects in PD test cells, including the floating metal, metallic protrusion, and void in epoxy resin. The inner coupler installed in the GIS tank, and the outer coupler placed outside the spacer, are used to measure the UHF signal. The relationship of the apparent charge and the amplitude of the time-domain signal, and the integral energy from 300 MHz to 1.6 GHz of the signal induced by PD in GIS are analyzed thoroughly. In this way, the severity of PD can be quantified using the UHF signal. In addition, to verify the sensitivity of the UHF detection method, a pulse generator with a rise time of about 500 ps is designed. The GIGRE method for the verification of sensitivity, which is used worldwide, is applied in the experiment. The results of the pulse generator experiment are compared to the results produced by the actual discharge sources, and several possible approaches of improving this method are proposed.
40 citations
01 Jan 1996
TL;DR: In this article, a model describing the excitation of UHF signals by current pulses in a waveguide is developed using dyadic Green's functions for the detection of partial discharge caused by defects in gas-insulated substations.
Abstract: A model describing the excitation of UHF signals by current pulses in a waveguide is developed using dyadic Green's functions. This model relates to UHF signals used for the detection of partial discharge (PD) caused by defects in gas-insulated substations (GIS). Application of the theory is demonstrated by comparison with experimental results for a cavity excited by a PD source. A technique for the injection of calibrated current pulses for PD simulation is also presented.
40 citations
TL;DR: In this article, the authors examined the limitations inherent to such diagnostics as applied to solid insulating systems and concluded that meaningful evaluation of PD measurements in terms of the rate of degradation or remaining life is impossible in the absence of a microscopic description of the defect.
Abstract: For pt.X see ibid., vol.8, no.1, p.16 (1992). The correlation of partial discharge (PD) measurements with insulation degradation and failure is addressed. The limitations inherent to such diagnostics as applied to solid insulating systems are examined. The discussion is based on simple experimental facts and the physics of discharge within solid dielectrics. It is concluded that meaningful evaluation of PD measurements in terms of the rate of degradation or remaining life is impossible in the absence of a microscopic description of the defect. >
40 citations
TL;DR: In this paper, a model of partial discharge development in electrical tree structures is presented, which considers channel conductivity, charge transport, and electric field redistribution during propagation of the discharge along the channels.
Abstract: A model of partial discharge development in electrical tree structures is presented. The model considers channel conductivity, charge transport, and electric field redistribution during propagation of the discharge along the channels. It has been used for numerical investigation of temporal-spatial and electric characteristics of the partial discharges in capillaries and electrical trees exposed to AC voltage in a needle-plane geometry. The simulation results have been compared with experimental data given in the literature.
40 citations