Effect of applied DC voltages and temperatures on space charge behaviour of multi-layer oil-paper insulation

Tang, Chao; Chen, G; Fu, Mingli; Liao, Ruijin

doi:10.1088/1742-6596/183/1/012006

Cited by 11 publications

(10 citation statements)

References 7 publications

(4 reference statements)

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“…1,2 However, most work in this field has been conducted at room temperature, while space-charge dynamics in insulation under DC electric stress at high temperature has received only limited attention. [3][4][5][6][7][8][9][10][11][12][13][14][15][16] My latest research 6 indicates that high temperatures have a significant effect on the formation and filling of shallow traps at dielectric interfaces.…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Formation and Stability of Shallow Trap at a Dielectric Interface of the Multilayer

Rogti

2015

Journal of Elec Materi

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Space-charge behavior at dielectric interfaces in multilayer low-density polyethylene (LDPE) and fluorinated ethylene propylene (FEP) subjected to a direct-current (DC) field has been investigated as a function of temperature using the pulsed electroacoustic technique. A sandwich structure constituted by two nonidentical LDPE/FEP dielectric films was used to study the charging propensity of electrode/dielectric and dielectric/dielectric interfaces. The time dependence of the space-charge distribution was subsequently recorded at four temperatures, 20°C, 25°C, 40°C, and 60°C, under field (polarization) and short-circuit (depolarization) conditions. The experimental results demonstrate that temperature plays a significant role in the space-charge dynamics at the dielectric interface. It affects the charge injection, increases the charge mobility and electrical conductivity, and increases the density of shallow traps and trap filling. It is found that traps formed during polarization at high temperature do not remain stable after complete discharge of the multidielectric structure and when poled at low temperatures.

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Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Formation and Stability of Shallow Trap at a Dielectric Interface of the Multilayer

Rogti

2015

Journal of Elec Materi

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“…This leads to a local field enhancement within the material that may cause insulation degradation and ultimately, electrical breakdown. However, most of such work was conducted at room temperature while space charge dynamics in insulation under dc electric stress at different temperatures has only received limited attention [1][2][3][4][5][6][7][8][9][10][11][12][13].The main objective of the present study is to provide a better understanding about the mechanisms responsible for space charge accumulation when a temperature is present across the insulation. To that purpose, we performed space charge measurements at different temperature, at both positive and negative polarity of the test voltage.…”

Section: Introductionmentioning

confidence: 99%

Temperature effect on space charge dynamics in multi-layer insulation Fluorinated Ethylene Propylene (FEP) Low Density Polyethylene (LDPE)

Rogti

Ferhat

2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Space charge behavior at dielectric interfaces in multi-layer Fluorinated Ethylene Propylene (FEP) and Low Density Polyethylene (LDPE) subjected to a dc field has been investigated as a function of the temperature using the pulsed electro acoustic (PEA) technique.A sandwich structure constituted by two dielectric films not identical FEP/LDPE was used to study the charging propensity of electrode/dielectric and dielectric/ dielectric interface. The time dependence of the space charge distribution was subsequently recorded at different temperature under field (polarization) and short circuit condition (depolarization). Experimental results demonstrated that charge injected process take place in all cases. However it is shown that the amount of interfacial charge depends drastically on the temperature. It has greater influence on the distribution, injection and mobility of space charge in the bulk and at dielectric/ dielectric interfaces.

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“…Previous research on space charge formation in oil/paper insulation system by the PEA method has found that homo-charge injection takes place in multi-layer paper impregnated with oil when subjected to dc electric field. Charge dynamics change with both electric field strength and temperature [3,5].…”

Section: Introductionmentioning

confidence: 99%

Space charge characteristics of oil impregnated insulation paper under the power frequency voltage

Hao¹,

Wu²,

Fu³

et al. 2013

2013 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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Space charge characteristics of insulating materials under AC voltage and DC voltage are equally important. There is a huge amount of AC transformers in the power transmission system. However, there is no report about the space charge characteristics of the oil-paper insulation materials under the AC voltage. In this paper, firstly, the space charge characteristics of the oil immersed insulating paper under the positive/negative DC field were investigated using the pulsed electro-acoustic (PEA) method. Secondly, the space charge characteristics of the oil immersed insulating paper under power frequency voltage were studied using the improved PEA system. Results show that the electric field polarity has a decisive impact on the charge distribution. When the DC electrical field is positive polarity, the polarity of the charge accumulated at the paper-paper interface near the aluminum electrode is positive, while it is negative when the DC field strength is negative. The charge polarity of the charge accumulated at the aluminum electrode is negative in the positive half cycle under the power frequency voltage. It is positive in the negative half cycle of the power frequency voltage. The charge polarity of the charges accumulated at the internal interface of the oil-immersed insulation paper are opposite for 90° and 270° phase in the voltage applied process. The charges accumulated within the oil-immersed insulating paper under the power frequency voltage show a significant reduction compared with the results under DC voltage.

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Effect of applied DC voltages and temperatures on space charge behaviour of multi-layer oil-paper insulation

Cited by 11 publications

References 7 publications

Effect of Temperature on Formation and Stability of Shallow Trap at a Dielectric Interface of the Multilayer

Effect of Temperature on Formation and Stability of Shallow Trap at a Dielectric Interface of the Multilayer

Temperature effect on space charge dynamics in multi-layer insulation Fluorinated Ethylene Propylene (FEP) Low Density Polyethylene (LDPE)

Space charge characteristics of oil impregnated insulation paper under the power frequency voltage

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