Effect of voltage reversal on space charge in oil and oil-impregnated pressboard under temperature gradient

Huang, Bo, Hao, Miao, Xu, Zhiqiang, Chen, George and Tang, Chao (2018) Effect of voltage reversal on space charge in oil and oil-impregnated pressboard under temperature gradient. In ICPADM 2018 - 12th International Conference on the Properties and Applications of Dielectric Materials. vol. 2018-May, IEEE. pp. 98-101 . (doi:10.1109/ICPADM.2018.8401112).

Abstract

Polarity reversal operation can affect the stability of the converter transformers due to the sudden electric field enhancement within the oil. With the purpose to study the transient electric field of oil after polarity reversal operation, the pulsed electroacoustic (PEA) method will be utilized in this paper to measure the space charge of two layers oil and pressboard during the polarity reversal operation. Two factors including different polarities of voltage and the temperature gradient effect are focused in this paper. Experimental results indicate that after the polarity reversal operation, the maximum electric field of the oil is higher when the polarity changed from negative (-) to positive (+) compared to the reversed voltage polarity operation under the temperature gradient. Moreover, the maximum electric field in the oil gap occurs at the transient state after the polarity reversal operation under the ambient temperature while that occurs at the steady state under the temperature gradient.

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