The properties of space charge in oil-paper insulation during electrical-thermal aging

2012 International Conference on High Voltage Engineering and Application Pub Date : 2012-11-26 DOI:10.1109/ICHVE.2012.6357125

Sicheng Wu, Jian Li, Linjie Zhao, Yan Wang, Zhiman He, Lianwei Bao

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引用次数: 6

Abstract

Valve windings of converter transformer withstand pulsating voltages. In order to reveal the relationship between the properties of space charge and electrical-thermal aging of oil-paper insulation in converter transformer, this paper did the electrical-thermal aging test at 70 °C under 7.6kV pulsating DC voltage and obtained the samples of different aging time. The internal space charge injection and accumulation properties of aged samples under 20kV/mm and 30kV/mm DC electric field was measured and analyzed by the Pulsed Electro-Acoustic (PEA) method. The results showed that homo-charges injection still occurs at both electrodes in the electrical-thermal aging samples. Aged oil-paper insulation was dominated by negative charge injection as the stressing time increases, which directly cause hetero-charge accumulation in the vicinity of the anode, and homo-charge accumulation near the cathode. It could help explain the reason of the electrical-thermal aging lifetime of oil-paper in sulation is obviously shorter than the electrical or thermal aging. In addition, the longer the aging time, the more the total charge accumulated in the samples.

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电热老化过程中油纸绝缘的空间电荷特性

换流变压器的阀绕组承受脉动电压。为了揭示换流变压器油纸绝缘空间电荷特性与电-热老化的关系，本文在7.6kV脉动直流电压下，在70℃条件下进行了电-热老化试验，得到了不同老化时间的试样。采用脉冲电声(PEA)方法对老化样品在20kV/mm和30kV/mm直流电场下的内部空间电荷注入和积累特性进行了测量和分析。结果表明，电热时效试样在两个电极上仍存在均电荷注入现象。随着应力时间的增加，老化的油纸绝缘以负电荷注入为主，直接导致阳极附近的异电荷积累和阴极附近的同电荷积累。这有助于解释绝缘油纸的电热老化寿命明显短于电热老化寿命的原因。此外，时效时间越长，样品中积累的总电荷越多。

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2012 International Conference on High Voltage Engineering and Application

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