直流和极性反转电压下石蜡基与环烷基变压器油纸界面电荷积聚特性及动态过程

doi:10.19595/j.cnki.1000-6753.tces.210127

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Abstract Regarding naphthene-base transformer oil (N oil) and hydroisomerized paraffine-base transformer oil (P oil) as the research objects, the dynamic process of space electric field and interface charge of oil-pressboard insulation under DC voltage and polarity reversal (PR) voltage was obtained. Under constant DC voltage, the amount of charge accumulation at the interface of P oil-pressboard was 86% of that of N oil, and the rate of charge accumulation was less than 30% of that of N oil. Under the PR voltage, polarity reversal time had a great influence. While the polarity reversal time was 1s, the electric field of P oil was 0.54 times that of N oil after the first reversal, and while the polarity reversal time was 120 s, the electric field of P oil was 1.65 times that of N oil. The influence of oil character on the converter transformer insulation is revealed from the point of view different from the conventional performance indexes such as physical, chemical and electrical characteristics. It is that different types of transformer oil have different mobility of positive and negative ions, resulting in different distribution patterns at the oil-pressboard interface. It provides a new method and guidance for selecting transformer oil reasonably and optimizing insulation design of converter transformer.

Key words： Paraffine-base naphthene-base transformer oil electric field charge DC polarity reversal

Received: 22 January 2021

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TM85

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	Zhang Shuqi
	Zhao Xiaolin
	Qi Bo
	Liu Xin
	Li Chengrong

Cite this article:

Zhang Shuqi,Zhao Xiaolin,Qi Bo等. Interface Charge Accumulation Characteristics and Dynamic Process of Paraffine-Base and Naphthene-Base Transformer Oils under DC and Polarity Reversal Voltage[J]. Transactions of China Electrotechnical Society, 2022, 37(3): 767-774.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.210127 OR https://dgjsxb.ces-transaction.com/EN/Y2022/V37/I3/767

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