Effect of physico-chemical degradation of epoxy resin on partial discharge behavior

Hudon, C.; Bartnikas, R.; Wertheimer, M. R.

doi:10.1109/94.484310

Cited by 46 publications

(24 citation statements)

References 35 publications

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“…As already reported in the literature, in large disk-shaped voids, transition takes place from streamer mechanism to Townsend mechanism due to a conducting layer formed on the dielectric walls by discharge by-products [7][8][9][10][11]. However, an important point to note is that streamer discharges do not occur in submillimeter cavities, in the absence of the critical length required for formation of a streamer head [1].…”

Section: Introductionmentioning

confidence: 83%

A parametric study on the PD pulses activity within micro-cavities

Ganjovi

2015

J Theor Appl Phys

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A two-dimensional kinetic model has been used to parametric investigation of the spark-type partial discharge pulses inside the micro-cavities. The model is based on particle-in-cell methods with Monte Carlo Collision techniques for modeling of collisions. Secondary processes like photo-emission and cathode-emission are considered. The micro-cavity may be sandwiched between two metallic conductors or two dielectrics. The discharge within the micro-cavity is studied in conjunction with the external circuit. The model is used to successfully simulate the evolution of the discharge and yield useful information about the build-up of space charge within the micro-cavity and the consequent modification of the applied electric field. The phase-space scatter plots for electrons, positive, and negative ions are obtained in order to understand the manner in which discharge progresses over time. The risetime and the magnitude of the discharge current pulse are obtained and are seen to be affected by micro-cavity dimensions, gas pressure within the micro-cavity, and the permittivity of surrounding dielectrics. The results have been compared with existing experimental, theoretical, and computational results, wherever possible. An attempt has been made to understand the nature of the variations in terms of the physical processes involved.

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Section: Introductionmentioning

confidence: 83%

A parametric study on the PD pulses activity within micro-cavities

Ganjovi

2015

J Theor Appl Phys

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“…The deposition of liquid by-products has been reported by many authors, mainly for polyethylene [16][17][18][19][20] and epoxy [21][22][23][24][25]. Gamez-Garcia et al [26] showed that droplets were formed on the surface of XLPE only when an atmosphere containing water and carbon monoxide was present.…”

Section: Liquid By-productsmentioning

confidence: 99%

“…Hudon et al [21,24] studied the PD behavior in an 0.5 mm air gap between epoxy covered electrodes in an unvented test cell. Initially, they detected large amplitude discharges that they named spark-type.…”

Section: Pd Mechanism Pulse Shape and Opticalmentioning

confidence: 99%

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Degradation of solid dielectrics due to internal partial discharge: some thoughts on progress made and where to go now

2005

IEEE Trans. Dielect. Electr. Insul.

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The amount of literature on partial discharge (PD) and partial discharge induced degradation is vast. In the past 10 -20 years significant progress has been made on research within partial discharge induced aging of dielectrics. Researchers now agree on the main mechanisms pertaining to this topic. With the advent of a new generation of dielectrics of which many properties now can be affected by the introduction of small amounts of nano-sized particles it seems to be a good moment to review the progress on the understanding of PD induced aging. Focusing on internal partial discharge in solid polymeric insulation this paper tries to identify achievements and at the same time challenges still to be solved.

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“…Therefore, as a complement of overall aging condition evaluation based on traditionally physicochemical parameters, PD analysis with the development of electrical degradation is of great significance, especially for risk assessment and fault diagnosis. So far a lot of researches focus on the analysis of PD properties and corresponding degradation products, mainly applied for epoxy and XLPE, in which prominent achievements have been made [2][3][4][5][6]. However, there are few reports in regard to the degradation process of oil-paper insulation in power transformers.…”

Section: Introductionmentioning

confidence: 99%

Investigation on Oil-paper Degradation Subjected to Partial Discharge Using Chaos Theory

Jun¹,

Wang²,

Liao³

et al. 2014

Journal of Electrical Engineering and Technology

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-In this paper, oil-paper samples composed of transformer windings were used to investigate the insulation degradation process subjected to partial discharge (PD), with artificial defects inside to simulate the PD induced insulation degradation. To determine appropriate test voltages, the breakdown time obtained through a group of accelerated electrical degradation tests under high voltages was firstly fitted by two-parameter Weibull model to acquire the average breakdown time, which was then applied to establish the inverse power law life model to choose advisable test voltages. During the electrical degradation process, PD signals were synchronously detected by an ultra-high frequency (UHF) sensor from inception to breakdown. For PD analysis, the whole degradation process was divided into ten stages, and chaos theory was introduced to analyze the variation of three chaotic parameters with the development of electrical degradation, namely the largest Lyapunov exponent, correlation dimension and Komogorov entropy of PD amplitude time series. It is shown that deterministic chaos of PD is confirmed during the oil-paper degradation process, and the obtained results provide a new effective tool for the diagnosis of degradation of oil-paper insulation subjected to PD.

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Effect of physico-chemical degradation of epoxy resin on partial discharge behavior

Abstract: Epoxy resin coated electrode specimens were subjected to partial discharges (PD) in air at twice the discharge inception voltage for durations ranging to 5000 h. The PD behavior was 1070-9878/95/ $3.00 @ 1995 IEEE

Cited by 46 publications

References 35 publications

A parametric study on the PD pulses activity within micro-cavities

A parametric study on the PD pulses activity within micro-cavities

Degradation of solid dielectrics due to internal partial discharge: some thoughts on progress made and where to go now

Investigation on Oil-paper Degradation Subjected to Partial Discharge Using Chaos Theory

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