Space charge behavior in oil-paper insulation under polarity reversed voltage

Wang, Da; Wang, Shiqiang; Lei, Min; Mu, Hai‐Bao; Zhang, Guanjun

doi:10.1109/cmd.2012.6416427

Cited by 5 publications

(3 citation statements)

References 7 publications

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“…Early in 1995, Liu investigated the charge storage and transport in oil-impregnated pressboard (1 mm in thickness,˘15 kV) at polarity reversal under HVDC by using the pressure wave propagation (PWP) technique [34], and significant field distortion was observed when the polarity reversal occurs. In recent years, researchers have paid more attention to the charge dynamics under polarity reversal voltage in single layered oil impregnated paper/pressboard [35][36][37].…”

Section: Polarity Reversalmentioning

confidence: 99%

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

et al. 2016

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This paper focuses on the space charge behavior in oil-paper insulation systems used in power transformers. It begins with the importance of understanding the space charge behavior in oil-paper insulation systems, followed by the introduction of the pulsed electrostatic technique (PEA). After that, the research progress on the space charge behavior of oil-paper insulation during the recent twenty years is critically reviewed. Some important aspects such as the environmental conditions and the acoustic wave recovery need to be addressed to acquire more accurate space charge measurement results. Some breakthroughs on the space charge behavior of oil-paper insulation materials by the research team at the University of Southampton are presented. Finally, future work on space charge measurement of oil-paper insulation materials is proposed.

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Section: Polarity Reversalmentioning

confidence: 99%

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

et al. 2016

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“…HVDC technology for long-distance transmission, asynchronous interconnections and long submarine cables is widely acknowledged as being economically and technically advantageous [1]. The HVDC converter transformer is the most crucial component of the HVDC power transmission system in regard to reliable and sustainable operations [2]. Unlike conventional transformers, HVDC converter transformers operate in complicated conditions where AC, DC, and DC polarity reversal stresses exist [3].…”

Section: Introductionmentioning

confidence: 99%

“…Unlike conventional transformers, HVDC converter transformers operate in complicated conditions where AC, DC, and DC polarity reversal stresses exist [3]. Particularly under DC conditions, it is easy for dielectric materials to accumulate space charges, which can enhance the local electric field and accelerate ageing or possibly cause premature breakdown [2]. The performance of an HVDC converter transformer primarily depends on its insulation system.…”

Section: Introductionmentioning

confidence: 99%

Influence of Thermal Aging on Dielectric Properties of Natural Ester Oil-Impregnated Paper

Yoon

Chen

Hosier

2023

IEEE Trans. Dielect. Electr. Insul.

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Mineral oil is widely used as a dielectric liquid in high voltage direct-current (HVDC) converter transformers because of its excellent electrical insulating and cooling properties. Due to the low biodegradability and high fire risk of mineral oil, natural ester oil is gaining considerable interest as a potential alternative for HVDC converter transformers. This requires more information thorough understanding of the electrical behaviours of natural ester oil under various conditions. This paper compares the impact of thermal ageing on the space charge characteristics of natural ester oil-impregnated paper to mineral oilimpregnated paper. During thermal ageing, although the increased acidity caused by the natural ester oil led to more charge accumulation in natural ester oil-impregnated paper compared to the mineral oil, the natural oil-impregnated paper showed a higher DC breakdown voltage.

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Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage

Hao

Zhou

Wilson

et al. 2014

2014 IEEE Conference on Electrical Insulation and Dielectric Phenomena (CEIDP)

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Abstract-In this study, the space charge dynamics in an oil and oil impregnated pressboard combined insulation system are investigated by the means of pulsed electroacoustic (PEA) technique under voltage polarity reversal conditions. To be closer to the real case in convertor transformers, a lmm thick pressboard covered with a O.5mm thick oil film were used as the testing sample. For comparison, three types of oil with different aging stages were used: fresh oil, medium aged oil and severely aged oil. The external electric field was firstly applied +IOkV/mm for lhour, then reversed to -IOkV/mm in lmin period. After that, the -IOkV/mm was applied for I hour. The results have clearly shown the impact of the oil film and the interface between oil and pressboard on charge dynamics under polarity reversal conditions. The electric field enhancement and the time constant of the 'mirror image effect' have been analyzed for different cases.

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Space charge behavior in oil-paper insulation under polarity reversed voltage

Cited by 5 publications

References 7 publications

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

Progress of Space Charge Research on Oil-Paper Insulation Using Pulsed Electroacoustic Techniques

Influence of Thermal Aging on Dielectric Properties of Natural Ester Oil-Impregnated Paper

Space charge dynamics in oil and thick pressboard combined system under polarity reversal voltage

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