Study on charge behavior in flowing transformer oil/pressboard composite insulation system using electro-optic field measurement

Katō, K.; Hashiba, Yasuhito; Nakagami, Yoshitake; Miyamoto, Masahiro; Ōkubo, H.

doi:10.1109/icdl.1999.798943

Cited by 13 publications

(3 citation statements)

References 4 publications

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“…Nonpolar liquids are jointly applied with polar solid dielectrics in electrical engineering (e.g. transformer oil + pressboard insulation) [1]. The charge creation and accumulation is a great problem for tube and tanker transport of fuel [2].…”

Section: Introductionmentioning

confidence: 99%

Mechanism of surface charge creation due to image forces

Korobeynikov¹,

Мелехов²,

Fürin³

et al. 2002

J. Phys. D: Appl. Phys.

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The image force is considered to be one of the non-specific sources of surface charge and origin of the double charge layer in the interface between a non-polar liquid dielectric and a polar solid. It is assumed that there is no interaction between phases, neither chemical interaction nor preferential adsorption, due to their specific chemical nature. Two possible physical mechanisms have been investigated. The first takes into account the existence of a potential barrier to the charge movement as it leaves the surface. Therefore, the charges that are in liquid are attracted to the surface. The second is the reduction of dissociation energy of ion pairs close to the interface in comparison with bulk dissociation. Both mechanisms result in a decrease of recombination rate and a sharp increase of dissociation rate. It has been shown that both these mechanisms could lead to the creation and accumulation of an abnormal non-specific surface charge carrier.

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Section: Introductionmentioning

confidence: 99%

Mechanism of surface charge creation due to image forces

Korobeynikov¹,

Мелехов²,

Fürin³

et al. 2002

J. Phys. D: Appl. Phys.

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“…E PB can be evaluated with equation (4), (4) where V is applied voltage. d oil and d PB are oil gap length and PB thickness.…”

Section: B Breakdown Behavior At Polarity Reversalmentioning

confidence: 99%

“…The electric field strength in the oil gap E oil was measured continuously by Kerr electro-optic technique [4,5] when polarity reversal of applied DC voltage. By examining the various conditions of polarity reversal of DC voltage, discharge inception criteria in the oil gap was studied.…”

Section: Introductionmentioning

confidence: 99%

Breakdown characteristics in oil/pressboard composite insulation system at HVDC polarity reversal

Ōkubo

Nara

Saito

et al. 2010

2010 Annual Report Conference on Electrical Insulation and Dielectic Phenomena

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By using Kerr electro-optic technique, electric field in oil / pressboard (PB) composite insulation system, which is the typical insulation system of a transformer, was investigated at polarity reversal of HVDC voltage. When the applied voltage polarity was sharply reversed, the applied electric field was superimposed by the electric field of accumulated charges on PB, and very strong field appeared right after the polarity reversal. This could cause the discharge in the oil gap and on the PB surface. The critical value of the discharge initiation at the polarity reversal was verified to be determined by the sum of the applied electric field and the electric field of accumulated charges on PB. The discharge was observed by a high-speed video camera. It was clarified that the surface discharge on PB did not overlap with each other, which was explained by that the surface discharge could neutralize the charges on PB.

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