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 article, it is shown how a partial discharge (PD) within a test sample generates a signal that can be measured outside the apparatus under test, and the fundamentals of how the phenomenon generates a current in the external circuit are explained.
Abstract: It is shown how a partial discharge (PD) within a test sample generates a signal that can be measured outside the apparatus under test. Because the transfer function between the phenomenon within the apparatus under test and the signal that can be measured can vary widely, measured partial-discharge magnitudes rarely have absolute meaning and are often referred to as effective partial-discharge magnitude to acknowledge this uncertainty. The most common sources of PD are floating components, corona, and voids. Each of these is considered in turn, and the fundamentals of how the phenomenon generates a current in the external circuit are explained. >
164 citations
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TL;DR: In this article, an on-line partial discharge (PD) detection technique applicable to power cables is described. But the method can be applied to both wire screen and solid shielded cables and can be used to check cable accessories such as splices and terminations.
Abstract: This paper describes an on-line PD (partial discharge) detection technique applicable to power cables. The method can be applied to both wire screen and solid shielded cables. In wire screen shielded cables, PD components with frequencies <100 MHz can be detected at distances over 150 m from the source, PD activity with levels as low as 20 pC can be detected within 100 m. However, in the case of solid shielded cables, PD levels of /spl ges/50 pC can be measured within 60 m in the frequency range <50 MHz. This method also can be utilized to check cable accessories such as splices and terminations. PD pulses with frequencies to /spl sim/300 MHz can be measured near the joints and terminations. The suitability and the sensitivity of the VHF technique were checked against two other alternative PD detecting techniques (pulse phase analyzer and high speed digital oscilloscope) by performing PD measurements in standard air gap and defects induced in EPR-insulated cable under laboratory-controlled conditions. The suitability and sensitivity of the VHF method were as good as the two alternative PD detection techniques.
156 citations
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TL;DR: In this paper, an electrical model of the discharge and the power supply was developed to study the interaction between these two elements, and a solution was deduced to increase the maximum power dissipated in the discharge which consists in decreasing the solid dielectric capacitance.
Abstract: This work is a contribution to the understanding of the mechanisms controlling the transition from a Townsend to a filamentary dielectric barrier discharge when the power increases. The approach consists in developing an electrical model of the discharge and the power supply to study the interaction between these two elements. The main components of the discharge model are (i) two Zener diodes whose characteristics depend on the power to take into account the effect of the gas density variation induced by the temperature variation and (ii) a RC circuit describing the memory effect from one discharge to the following one which is due to the metastables and the electrons trapped on the surface of the solid dielectrics. The calculated and measured currents are very similar over all the range of amplitude and frequency allowing to get an atmospheric pressure Townsend discharge. The model also describes the transition to filamentary discharge observed when the excitation frequency increases too much showing that it is due to a very fast variation of the load connected to the power supply. From this understanding, a solution is deduced to increase the maximum power dissipated in the discharge which consists in decreasing the solid dielectric capacitance.
156 citations
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TL;DR: In this paper, the authors present a method based on the principle of wideband radio-frequency interference which can be used for noninvasive monitoring of discharges at substations.
Abstract: Partial discharges (PDs) generate wideband radio-frequency interference which can be used for noninvasive monitoring of discharges. This paper presents a novel method based on this principle for PD monitoring of substations. The significant advantage of this method lies in the ability to detect PD sources in energized equipment anywhere within a substation compound during normal operating conditions. The results obtained from the prototypes installed in the U.K. and U.S. substations are reported. Results include correlation with apparent charge and daily recordings obtained before, during, and after the failure of a 132-kV current transformer and 69-kV voltage transformer.
155 citations
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TL;DR: In this paper, the authors have carried out experiments using an MB-PWB insulation simulated structure for dielectric failure, a rod-toplane electrode for PD erosion resistance, and a sphere-to-sphere electrode for BD strength for four kinds of insulation samples.
Abstract: It is often observed that the insulation structure for an insulated gate bipolar transistor (IGBT) suffers from dielectric failure, when the insulation is made of epoxy resin to which micro fillers with a high thermal conductivity were added. In order to reveal the above phenomena and to clarify the breakdown (BD) mechanism, we have carried out experiments using an MB-PWB (metal-base printed wiring board) insulation simulated structure. As a result, it was clarified that the IGBT insulation breaks down after successive partial discharges (PDs). It was also elucidated that BD strength becomes lower, when epoxy resin was loaded with high content of micro-fillers. A trial was made to raise the once-lowered BD strength by adding nano-Al2O3 fillers. Three kinds of experiments were carried out, i.e. an MB-PWB insulation simulated structure for dielectric failure, a rod-to-plane electrode for PD erosion resistance, and a sphere-to-sphere electrode for BD strength for four kinds of insulation samples, i.e. neat epoxy, 5-wt% nano- Al2O3/epoxy composite, 60-wt% micro-Al2O3/epoxy composite, and combined 2-wt% nano- and 60-wt% micro-Al2O3/epoxy composite. It was clarified that the nano-micro-composite is higher in both BD strength and PD resistance than the micro-composite. It should be noted that the addition of nano-fillers would provide an excellent approach that can increase the dielectric BD strength and time of micro-filled epoxy composites.
152 citations