Research on Polarization-Depolarozation Current of Oil-impregnated Paper after Electrical-thermal Aged

2018 Condition Monitoring and Diagnosis (CMD) Pub Date : 2018-09-01 DOI:10.1109/CMD.2018.8535844

Yunkun Deng, Fengli Li, Zhonghua Sun, Dada Wang, Yi Ma, Y. Yin, Jiandong Wu

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Abstract

The primary insulating material in the converter transformer, oil-impregnated paper, is subject to a complex electric field, mainly including the direct current (DC) stress, the alternating current (AC) stress and relatively minor harmonic stress. In order to investigate the effect of electrical-thermal aging on the oil-paper insulation properties, the breakdown voltage and polarization-depolarization current of oil-impregnated paper samples with different aging conditions were measured respectively. Firstly, the operation electrical field of transformer valve windings was simulated in the PSCAD software, which manifested the proportion of the prominent components-DC stress and AC stress. In terms of the simulation result, the oil-paper sample with different aging hours were prepared by conducting the laboratory accelerated electrical-thermal aging tests. Afterwards, the polarization-depolarization current of samples aged 0 h, 48 h, 72 h, 96 h and 120 h were measured. It showed that electrical-thermal aging caused the deterioration of oil-impregnated paper, resulting in the increase of polarization-depolarization current.

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油浸纸电热老化后的极化-去极化电流研究

换流变压器中的初级绝缘材料油浸纸受到复杂的电场作用，主要包括直流(DC)应力、交流(AC)应力和相对较小的谐波应力。为了研究电热老化对油纸绝缘性能的影响，分别测定了不同老化条件下油浸纸试样的击穿电压和极化退极化电流。首先，在PSCAD软件中对变压器阀绕组的运行电场进行了仿真，得到了突出分量直流应力和交流应力的比例。模拟结果表明，通过室内加速电-热老化试验制备了不同老化时间的油纸样品。然后，测量样品老化0 h、48 h、72 h、96 h和120 h时的极化-退极化电流。结果表明，电-热老化导致油浸纸劣化，极化-退极化电流增大。

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2018 Condition Monitoring and Diagnosis (CMD)

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