Effect of Moisture Content on Dynamic Characteristics of Space Charge in Oil-paper Insulation under AC Field

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI:10.1109/CMD.2018.8535898

Jiaxuan Xu, Yunkun Deng, Yi Ma, Fengli Li, Jiandong Wu, Y. Yin

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引用次数: 3

Abstract

Oil-impregnated pressboard samples with water content of 0.34%, 0.98% and 1.81 % were used to investigate the effect of moisture content on dynamic characteristics of space charge under AC stress. Space charge contribution were observed by a fast space charge detecting system based on the automatic equipartition phase shift (AEPS) principle. It shows that space charges are injected from the top electrode for the sample with moisture content of 0.34%. The peak value of homo-charge in both electrodes significantly increase for the sample with moisture connect about 0.98%. It may be associated with the reduction of the charge injection barrier between oilpaper insulation and electrode. And the injection speed for ground electrode increases more than the injection speed for top electrode. This is because the material of two electrodes are different, and the energy level of charges in ground electrode is higher. With moisture content increases, the depth of traps within oil-paper may increase, lead to charges injected from ground electrode easier to be trapped. As moisture content rises from 0.98% to 1.81%, the space charge accumulation phenomena after charge injection and extraction in AC positive half-period is dominated by homo-charge injected from ground electrode, and may suppress the electric field distortion near ground electrode.

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交流电场下含水率对油纸绝缘空间电荷动态特性的影响

采用含水率分别为0.34%、0.98%和1.81%的油浸压板试样，研究了含水率对交流应力下空间电荷动态特性的影响。利用基于自动均分相移(AEPS)原理的快速空间电荷检测系统观测了空间电荷的贡献。结果表明，当样品含水率为0.34%时，空间电荷从顶部电极注入。当样品含水率为0.98%时，两电极的均电荷峰值显著增加。这可能与油纸绝缘层和电极之间电荷注入屏障的减少有关。地电极的注射速度比顶电极的注射速度增加得多。这是因为两个电极的材料不同，地电极中电荷的能级较高。随着含水率的增加，油纸内部的陷阱深度会增加，导致从地电极注入的电荷更容易被困住。当含水率从0.98%上升到1.81%时，在交流正半周期注入和提取电荷后的空间电荷积累现象以地电极注入的均匀电荷为主，并可能抑制地电极附近的电场畸变。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2018 Condition Monitoring and Diagnosis (CMD)

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