dc field effects on streaming electrification in insulating oils

Wu, Hao; Jayaram, S.

doi:10.1109/94.536728

Cited by 22 publications

(1 citation statement)

References 14 publications

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“…Flow electrification in transformers is researched for >50 years. However, the mechanism of oil flow electrification is not clear, particularly for the mechanisms of electrification of oil‐pressboard insulation under dc voltage [1–6]. Recent research interests of electrification phenomena are the observation of flow electrification in the special working condition of a converter transformer [7–9].…”

Section: Introductionmentioning

confidence: 99%

Effect of temperature on flow electrification under dc electrical field

Gao

Liu

Lü

et al. 2019

J. eng.

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Section: Introductionmentioning

confidence: 99%

Effect of temperature on flow electrification under dc electrical field

Gao

Liu

Lü

et al. 2019

J. eng.

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Influence of dc and dc/ac composite fields on the flow electrification characteristics of transformer oil

et al. 2000

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Flow electrification characteristics of transformer oil were investigated by applying dc and dc/ac composite fields to both bare and covered coaxial cylinder electrode systems. For the bare electrode system, flow electrification characteristics were almost the same between positive and negative dc voltage applications and negative charges were generated for both dc and dc/ac composite voltage applications at high dc fields. For the covered electrode system, the apparent flow electrification characteristics differed between positive and negative dc voltage applications. For the former, negative charges were generated at high dc fields for both dc and dc/ac composite voltage applications, and for the latter, positive charges were always generated for both voltage applications. However, negative charge generation for the positive voltage application was attributed to the influence of negative charge generation at the bare part of the covered electrode end; the fundamental charge generation characteristics of the covered electrode showed an increase of positive charge generation by dc voltage application, and positive charge generation was accelerated by a composite ac field. © 1999 Scripta Technica, Electr Eng Jpn, 130(2): 10‐17

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An experimental study on the transformer coil leakage current

Wahab

Hamada

Zeitoun

et al. 2006

Int Trans Elec Energy Syst

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SUMMARYThis paper is concerned with the transformer coil dc leakage current under different conditions. These conditions include in-air, and in-oil leakage, currents with or without artificial coil deposits. In-oil leakage, currents are investigated when the coil is immersed in new or used transformer oil at different temperatures. The results showed that the leakage current increases with the increase in the applied voltage and oil temperatures. The rate of increase in leakage current with temperature depends on the transformer oil and coil conditions. The in-oil leakage currents are higher than those obtained in air. The leakage currents measured in used oil are higher than those resulted in new oil. Copper deposits cause higher values of leakage current than iron deposits for the same medium, applied voltage and temperature. Deposits increase the leakage current for different coil surrounding media. A linear model for the leakage current as a function of the applied voltage under different conditions has been found and its validity has been justified by statistical consideration. The parameters of this model account for various experimental conditions.

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dc field effects on streaming electrification in insulating oils

Cited by 22 publications

References 14 publications

Effect of temperature on flow electrification under dc electrical field

Effect of temperature on flow electrification under dc electrical field

Influence of dc and dc/ac composite fields on the flow electrification characteristics of transformer oil

An experimental study on the transformer coil leakage current

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