Breakdown Characteristics of Oil-Pressboard Insulation under AC-DC Combined Voltage and Its Mathematical Model

Chen, Qingguo; Zhang, Jinfeng; Chi, Minghe; Guo, Chong

doi:10.3390/en11051319

Cited by 9 publications

(9 citation statements)

References 19 publications

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“…Oil-paper insulation near the value side of a converter transformer works under AC-DC combined voltage, which allows space charge to accumulate within the sample more easily. Space charge will accelerate the aging of the insulator and distort the electric field, which directly affects the operational reliability of the converter transformer [2][3][4].…”

Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Space Charge Distribution of Oil–Paper Insulation under DC and Polarity Reversal Voltage

et al. 2018

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The electric field distortion caused by space charge is an important factor affecting the operation reliability of oil–paper insulation in a converter transformer. To study the accumulation and decay characteristics of the space charge within oil-impregnated pressboard under DC and polarity reversal voltage, and consider the possible operating conditions of the converter transformer, the space charge behavior of oil-impregnated pressboard was measured by the pulsed electro-acoustic (PEA) method in the temperature range from −20 °C to 60 °C. The effect of temperature on the accumulation and decay characteristics of space charge is also analyzed. The space charge accumulated within the pressboard at low temperature is mainly homocharge injected by the electrode, while heterocharge formed by ion dissociation counteracts some of the homocharge at high temperature. Thus, the space charge of pressboard first increases, then decreases, with an increase in temperature. However, slow decay of the space charge causes severe distortion of the electric field distribution in the pressboard during voltage polarity reversal.

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Section: Introductionmentioning

confidence: 99%

Effect of Temperature on Space Charge Distribution of Oil–Paper Insulation under DC and Polarity Reversal Voltage

et al. 2018

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“…In recent years, electrical characteristics of solid and liquid insulation were investigated under composite AC & DC voltage [2, 10–15]. Li et al.…”

Section: Discussionmentioning

confidence: 99%

“…There are some studies for different application fields such as electrical treeing, breakdown and partial discharge measurements for different insulation materials, etc. [2,[10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

Investigation of impact of DC component on breakdown characteristics for different electric fields under composite AC & DC voltage

et al. 2022

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The valve side of the converter in the high-voltage direct current is subjected to mixed voltages such as composite AC & DC voltage. In this study, the effects of the homogeneity of electric field on breakdown voltage were investigated for different �DC component amplitudes of the composite voltage. The field efficiency factor was calculated using mean and maximum field strengths for all of them. Variation of breakdown voltage of air was examined under the composite AC & DC voltage for different ratios �DC. As one result of the study, the breakdown occurs at the positive half-wave of the AC voltage despite −DC voltage being applied due to positive corona discharge pulses. This breakdown point is named as the polarity change point. The breakdown voltage increases with the decrease of DC voltage component up to polarity change point in nonuniform electric field. In less uniform electric field, the AC breakdown voltage was measured slightly higher than the DC breakdown voltage. In less uniform electric field, as the ratio of the applied AC voltage to DC voltage increases, the breakdown voltage gradually approaches the AC breakdown voltage. This result is similar to the result obtained for the +DC component in non-uniform electric field experiments.This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.

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“…The polarity and amount of interface charge is affected by the relative permittivity, resistivity and thickness. The relative permittivity of the impregnated pressboard is about twice that of oil, and they are less affected by temperature [20]. However, the conductivity is greatly affected by the temperature, which will affect the interface charge greatly.…”

Section: A Effect Of Temperature On Space Charge Accumulationmentioning

confidence: 99%

Effect of Temperature on Space Charge Distribution in Two Layers of Transformer Oil and Impregnated Pressboard Under DC Voltage

et al. 2020

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The space charge accumulation is an important factor to design the oil-pressboard composite insulation of convertor transformer, which is greatly affected by the temperature. In this paper, the space charge accumulation and attenuation in the two layers and single layer under DC voltage were studied by the Pulsed Electro-Acoustic Method from 20 • C to 60 • C, and the electric field distribution was calculated by the space charge distribution. The studied results have indicated that the distributions of space charge and electric field in the test results do not follow the Maxwell-Wagner polarization. The space charge distribution is affected by the surface trap, bulk trap, charge migration and electric field. The temperature affected the polarity and amount of the charge at oil-pressboard interface. The space charge accumulation of the two layers is more complex than that of the single layer, and the space charge accumulation and attenuation of two layers need longer time to reach the stable stage. The space charge accumulation in the single layer is largest at 40 • C, whereas the space charge accumulation in the two layers is largest at 20 • C. Moreover, the increase in the temperature increases the attenuation amplitude and speed of space charge. INDEX TERMS Space charge, two layers, oil-pressboard insulation, temperature.

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Breakdown Characteristics of Oil-Pressboard Insulation under AC-DC Combined Voltage and Its Mathematical Model

Cited by 9 publications

References 19 publications

Effect of Temperature on Space Charge Distribution of Oil–Paper Insulation under DC and Polarity Reversal Voltage

Effect of Temperature on Space Charge Distribution of Oil–Paper Insulation under DC and Polarity Reversal Voltage

Investigation of impact of DC component on breakdown characteristics for different electric fields under composite AC & DC voltage

Effect of Temperature on Space Charge Distribution in Two Layers of Transformer Oil and Impregnated Pressboard Under DC Voltage

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