温-频耦合效应对高频固态变压器绝缘局部放电特性的影响

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Abstract Partial discharge(PD) is one of the main causes of the insulation failure in the high frequency solid state transformer(SST). A comprehensive thermal-electrical test rig is established as to study the impacts of the coupled temperature-frequency effects. Four temperature points from 30℃ to 160℃, together with five frequency points from 10kHz to 50kHz, are chosen to physically model the partial discharge scenario in the SST, and the temperature- and frequency-dependent characteristics of several typical PD parameters are elucidated in details. The experimental results show that, the maximum and the mean discharge amplitudes as well as the discharge times render an increasing tendency with temperature rising, while the frequency-dependent behavior gives a negative correlation. However, the PDIV keeps roughly constant with frequency variation. The frequency-induced of space charge accumulation effect plays a dominant role in the above physical changes, in the meanwhile, the coupled temperature-frequency stress changes the insulation permeability as well as the tangential E-field vector, which executes a prominent impact on the PD development.

Key words： Solid state transformer partial discharge coupled temperature-frequency effect space charge conductivity

Received: 03 December 2013 Published: 14 April 2015

PACS:

TM855

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	Articles by authors
	Han Shuai
	Li Qingmin
	Liu Weijie
	Lu Xu
	Wang Gaoyong
	Wei Xiaoguang

Cite this article:

Han Shuai,Li Qingmin,Liu Weijie等. Impacts of Coupled Temperature-Frequency Effects on Partial Discharge Characteristics of High Frequency Solid State Transformer Insulation[J]. Transactions of China Electrotechnical Society, 2015, 30(2): 204-210.

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2015/V30/I2/204

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