Measurement and simulation of PD in epoxy voids

Gutfleisch, F.; Niemeyer, L.

doi:10.1109/94.469970

Cited by 342 publications

(317 citation statements)

References 23 publications

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“…The statistical time lag results from a missing start electron in the void which is mostly provided by background irradiation. Background irradiation may directly provide first electrons by volume ionization (gas ionization in the void) or by the surface photo effect, which releases electrons from the void surface [1][2][3][4][5]. However, the first electron production mechanism is a time dependent probability function which depends strongly on the void size.…”

Section: Introductionmentioning

confidence: 99%

Application of pulsed x-ray induced partial discharge measurements

Adili

Franck

2012

IEEE Trans. Dielect. Electr. Insul.

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Section: Introductionmentioning

confidence: 99%

Application of pulsed x-ray induced partial discharge measurements

Adili

Franck

2012

IEEE Trans. Dielect. Electr. Insul.

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“…The decay of electrons on the surface of insulation defects, which would lead to a lessened emission probability h(t), is mainly caused by surface conduction, hetero-charge recombination and capture by deep traps. Furthermore, the decay velocity of electrons can be approximately described by Ohm's law [26], as shown in Eq. (5).…”

Section: Discussionmentioning

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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“…During a PD event, the flow of current through the streamer due to electron avalanche causes the electric field in the void to decrease. Discharge stops once the field in the void becomes less than the extinction field [6,7]. …”

Section: Pd In Voidsmentioning

confidence: 99%

“…the void inception field, E inc is exceeded and there must be a free initial electron existing to initiate an electron avalanche [2,6,7]. The main sources of initial free electron are surface emission, where a free electron is emitted from the void surface due to electric field and temperature, and volume ionization, where an electron appears through radiative gas ionization by an energetic photon [6,7]. When a PD occurs in a void, the void becomes conducting from that of non-conducting state [2,9].…”

Section: Pd In Voidsmentioning

confidence: 99%

“…However, works on PD activity within more than one void in a dielectric are not widely published. Most of the published works reported on measurement and modelling of PD events within a single void in a dielectric material [4][5][6][7][8][9][10][11]. Therefore, it is interesting to study PD activity within more than one void in a dielectric material.…”

Section: Introductionmentioning

confidence: 99%

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Partial discharges within two spherical voids in an epoxy resin

Illias¹,

Chen²,

Bakar³

et al. 2013

J. Phys. D: Appl. Phys.

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A void in a dielectric insulation material may exist due to imperfection in the insulation manufacturing or long term stressing. Voids have been identified as one of the common sources of partial discharge (PD) activity within an insulation system, such as in cable insulation and power transformers. Therefore, it is important to study PD phenomenon within void cavities in insulation. In this work, a model of PD activity within two spherical voids in a homogeneous dielectric material has been developed using finite element analysis software to study the parameters affecting PD behaviour. The parameters that have been taken into account are the void surface conductivity, electron generation rate and the inception and extinction fields. Measurements of PD activity within two spherical voids in an epoxy resin under ac sinusoidal applied voltage have also been performed. The simulation results have been compared with the measurement data to validate the model and to identify the parameters affecting PD behaviour. Comparison between measurements of PD activity within single and two voids in a dielectric material have also been made to observe the difference of the results under both conditions.

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Measurement and simulation of PD in epoxy voids

Cited by 342 publications

References 23 publications

Application of pulsed x-ray induced partial discharge measurements

Application of pulsed x-ray induced partial discharge measurements

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

Partial discharges within two spherical voids in an epoxy resin

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