Particle-initiated breakdown in a quasi-uniform field in transformer oil

Carraz, F.; Rain, Pascal; Tobazéon, R.

doi:10.1109/94.484307

Cited by 54 publications

(17 citation statements)

References 23 publications

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“…Krins et al [3] observed that a conducting particle affects the breakdown strength of the oil more than the insulating particle. Some literature is available dealing with particle initiated breakdown in transformer oil under AC and DC voltages [4,5] but further research is essential to understand the polarity of the applied voltage on partial discharge formation due to particle movement. Birlasekaran has studied particle movement in transformer oil under AC and DC fields both theoretically and by experimental study [6,7].…”

Section: Introductionmentioning

confidence: 99%

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Sarathi

Reid²,

Judd³

2008

Electric Power Systems Research

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Section: Introductionmentioning

confidence: 99%

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Sarathi

Reid²,

Judd³

2008

Electric Power Systems Research

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“…The twoparameter Weibull distribution is shown in Eq. (1), where F(u) is the probability of breakdown, α is the scale parameter and β is the shape parameter and u is breakdown [4][5][6][7] show that the breakdown voltage data of contaminated oil are distributed in both sides of the Weibull probability straight line, which indicates that the breakdown voltage data of contaminated oil almost satisfy the Weibull distribution.…”

Section: Weibull Distribution Analysismentioning

confidence: 99%

“…In view of the research progress of the particle effect on the breakdown of insulating oil, focus was made on the particle types [7][8][9], voltage types [10,11] particle movement [12,13] under electric field, and partial discharge [10,13] in insulating oil. Reference [7,8] observed that conducting particles affect the dielectric strength much more than insulating particles, and larger particles reduce the breakdown voltage even more significantly. Reference [9] obtained insulating oil with different content of carbon particles through different numbers of lightning discharge and investigated the influence of carbon particle concentration on the breakdown voltage of insulating oil at AC voltage.…”

Section: Introductionmentioning

confidence: 99%

Copper Particle Effect on the Breakdown Strength of Insulating Oil at Combined AC and DC Voltage

Wang¹,

Li²,

Wei³

et al. 2017

Journal of Electrical Engineering and Technology

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-Converter transformer is the key equipment of high voltage direct current transmission system. The solid suspending particles originating from the process of installation and operation of converter transformer have significant influence on the insulation performance of transformer oil, especially in presence of DC component in applied voltage. Under high electric field, the particles easily lead to partial discharge and breakdown of insulating oil. This paper investigated copper particle effect on the breakdown voltage of transformer oil at combined AC and DC voltage. A simulation model with single copper particle was established to interpret the particle effect on the breakdown strength of insulating oil. The experimental and simulation results showed that the particles distort the electric field. The breakdown voltage of insulating oil contaminated with copper particle decreases with the increase of particle number, and the breakdown voltage and the logarithm of particle number approximately satisfy the linear relationship. With the increase of the DC component in applied voltage, the breakdown voltage of contaminated insulating oil decreases. The simulation results show that the particle collides with the electrode more frequently with more DC component contained in the applied voltage, which will trigger more discharge and decrease the breakdown voltage of insulating oil.

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“…M. Krins et al reported that the breakdown voltage of carbonized oil reduces by more than 20 percent at about 20 • C because of the agglomeration of carbon particles [15]. More results show that conducting particles affect the dielectric strengths much more than insulating particles, and larger particles reduce the breakdown voltage even more significantly [24,25]. The particles in insulating oil suspends and flow with the oil.…”

Section: Introductionmentioning

confidence: 86%

Influence of Copper Particles on Breakdown Voltage and Frequency-Dependent Dielectric Property of Vegetable Insulating Oil

Wang

Ran

et al. 2017

Energies

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Abstract:The insulating performance of oil is vulnerable to particles especially the conductive particles. This paper investigated the influence of copper particles of micrometer size on the breakdown strength and frequency-dependent properties of vegetable oil. The AC breakdown voltage of contaminated vegetable oil with copper particles of different numbers (ranging from 10 3 to 10 6 ) was measured. The frequency-dependent dielectric properties including volume resistivity, relative permittivity and dissipation factor of the contaminated vegetable oil with copper particles of various volumetric concentrations (0.011%, 0.056% and 0.112%) were measured. Identical experiments were conducted with mineral oil for comparison. Results show that the AC breakdown voltage of vegetable oil decreases with the increase of copper particle concentration. The mineral oil exhibits a similar trend, but the influence of copper particles on the AC breakdown voltage of vegetable oil is less significant than that on mineral oil because of its greater viscosity. The relative permittivity and dissipation factor increase with increasing copper volumetric concentration while the volume resistivity decreases. The influence of copper particles on them is significant at low frequencies and this influence becomes inconspicuous as the frequency increases. Similar results were observed for mineral oil.

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Particle-initiated breakdown in a quasi-uniform field in transformer oil

Cited by 54 publications

References 23 publications

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Partial discharge study in transformer oil due to particle movement under DC voltage using the UHF technique

Copper Particle Effect on the Breakdown Strength of Insulating Oil at Combined AC and DC Voltage

Influence of Copper Particles on Breakdown Voltage and Frequency-Dependent Dielectric Property of Vegetable Insulating Oil

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