温度对流动变压器油中悬移气泡局部放电特性的影响与作用机制

doi:10.19595/j.cnki.1000-6753.tces.190128

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Abstract Suspended bubbles are a typical insulation defect in transformer oil, which can easily initiate partial discharge (PD). To clarify the effect of temperature on PD characteristics induced by the bubbles in flowing transformer oil, an oil circulation experimental platform was designed, and a large number of PD experiments at different temperatures were conducted. Characteristic parameters of PD waveform, PD phase, PD frequency, and apparent charge were analyzed. The results show that the PD frequency declines rapidly and then increases slowly when the temperature increases from 40℃ to 80℃, whereas the average apparent charge continuously declines. Moreover, the temperature has no obvious influence on the time-domain current pulse. At different temperatures, PDs are mainly distributed in the negative half cycle of AC voltage, and the PD number at the phase of 270° is the largest. In addition, the mechanism of temperature influence on the PD characteristics in flowing transformer oil was discussed combining the simulations of deformation, fusion, and electric field distortion of the bubbles.

Key words： Temperature partial discharge suspended bubble flowing transformer oil

Received: 27 January 2019 Published: 27 March 2020

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TM855

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	Zhang Yongze
	Tang Ju
	Pan Cheng
	Luo Xinyu

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Zhang Yongze,Tang Ju,Pan Cheng等. Effects of Temperature on Partial Discharge Characteristics Induced by Suspended Bubbles in Flowing Transformer Oil and the Mechanism[J]. Transactions of China Electrotechnical Society, 2020, 35(6): 1357-1367.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.190128 OR https://dgjsxb.ces-transaction.com/EN/Y2020/V35/I6/1357

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