Nonstationary behaviour of partial discharge during discharge induced ageing of dielectrics

Brunt, R. J. Van; Glahn, P. von; Las, T.

doi:10.1049/ip-smt:19951435

Cited by 21 publications

(11 citation statements)

References 15 publications

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“…Obviously, the proper direct-probing terminals to assemble the measuring apparatus are the neutral and bushing terminals [2]. In general, the incidence time and the location of the PDs are random in the transformers; and they produce complicated non-stationary waveforms inherently [3]. Anyway, in order to obtain further information from the signal that is not readily available in the timedomain the suitable analysis of PD current signals is of the major importance.…”

Section: Introductionmentioning

confidence: 99%

Analysis of partial discharge by Wavelet–Hilbert transform

Sarikhani

Reihani

Nabizadeh

et al. 2008

Int Trans Elec Energy Syst

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SUMMARYTime-frequency and time-scale transforms are one of the powerful mathematical methods for feature extraction of non-stationary signals such as partial discharge (PD) signals. Modified Fourier-based transforms and Wavelet transforms are well known among them. PD signals can be analyzed by these influential methods but normally with some serious limitations and inadequacies. This paper proposes a new approach based on WaveletHilbert transform for the analysis of electrical PD signals. The mathematical model of a Wavelet-Hilbert transform is described. Contemplating of natural behavior of PD, that is, stochastic and non-stationary an artificial multi-source of PD is simulated in a Detail model of an HV power transformer winding. The PD signal is measured at the bushing terminal of the faulty model, and then it is analyzed. The analyzed PD signal by the proposed method shows great advantages over the Fourier based algorithms.

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Section: Introductionmentioning

confidence: 99%

Analysis of partial discharge by Wavelet–Hilbert transform

Sarikhani

Reihani

Nabizadeh

et al. 2008

Int Trans Elec Energy Syst

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“…(18), also change the amplitude distribution. It will be shown below that the time (or phase) distribution of PD is primarily controlled by the rate of initiatory electron release into the gap, which is, in turn, affected by the local field strength at or near the emitting electrode (or dielectric) surface.…”

Section: Nonstationary Behaviormentioning

confidence: 96%

“…Nonstationary behavior of PD has been observed under a variety of experimental conditions [18,19,26,27,651. By the term nonstationary behavior it is meant that the statistical characteristics of PD such as the pulse-height or phase distributions have a dependence on time.…”

Section: Nonstationary Behaviormentioning

confidence: 99%

“…Additional evidence of the effect of changing surface conductivity is provided from recent work on point-epoxy gaps [18,27, 681. Figure 9 shows examples of integrated charge distributions, po(Q+) and po(Q-), measured at different indicated times for discharge pulses generated by applying a 50-Hz, 3.0-kV rms alternating voltage to a sharp point electrode that touches a flat cast epoxy surface.…”

Section: Ae(t + a T ) + Ae(t) T Ae'mentioning

confidence: 99%

“…Included in these investigations are measurements of: (1) gaseous by-products from the discharge [15, 161, (2) removal of solid material or other local changes in morphology [17], (3) changes in solid dielectric surface resistivity [18, 191, (4) surface acidification, oxidation or deposition of material [20, 21, 221 and (5) growth of voids, cracks, or trees within a dielectric [23, 24, 25, 261. It has been noted [18,27] that the PD-induced changes in the discharge site characteristics will in turn cause changes in the PD behavior that make the phenomenon inherently nonstationary. The susceptibility to nonstationary behavior complicates the interpretation of PD signals.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Physics and chemistry of partial discharge and corona - recent advances and future challenges

Brunt

Proceedings of IEEE Conference on Electrical Insulation and Dielectric Phenomena - (CEIDP'94)

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Fundamental study for assessment of surface resistivity based on waveform characteristics of partial discharge

Kawashima

Hirukawa

Yoshikawa

et al. 2023

Electrical Engineering Japan

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The partial discharge (PD) waveform reflects the evolution process of electron avalanche in the discharge space. The authors expect to estimate the condition of the discharge space based on the PD waveform characteristics. The semiconductive sheet was attached to the insulator to simulate the decrease in surface resistance due to deterioration. With the reduction of the surface resistivity, the shoulder appeared on the rising part of the PD waveform and the rise time of the PD waveform became longer. In addition, we simulated the change in the rise time using an equivalent circuit model. The displacement current was calculated from the surface potential distribution estimated by the diffusion equation, and the PD current was simulated by summing up all the current components. As a result, the shoulder was reproduced at the rising part of the PD waveform in the simulation as well. The surface resistance was estimated from the PD waveform by fitting with the experimental results.

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Nonstationary behaviour of partial discharge during discharge induced ageing of dielectrics

Cited by 21 publications

References 15 publications

Analysis of partial discharge by Wavelet–Hilbert transform

Analysis of partial discharge by Wavelet–Hilbert transform

Physics and chemistry of partial discharge and corona - recent advances and future challenges

Fundamental study for assessment of surface resistivity based on waveform characteristics of partial discharge

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