热、电应力与环氧树脂变压器局部放电行为的关系

H. Borsi
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引用次数: 13

摘要

讨论了环氧树脂变压器线圈在-30 ~ 180℃温度范围内的局部放电行为。特别是考虑了局部放电起始电压,这是判断变压器局部放电特性在温度范围内的重要参数。在步进试验中,确定了不同静态温度下的局部放电起始电压。线圈的回火发生在外部,通过将油浸入回火流体中,也发生在内部,借助电流损失。以配电变压器高压线圈模型为试样。确定并讨论了线圈的PD起始电压与导线绝缘、内外回火等参数之间的依赖关系。本文介绍了在175℃温度下,五个线圈在1.75 kV电压下受力一年的长期试验结果。在此期间,进行了灵敏度为2 pC的PD测量。>
本文章由计算机程序翻译,如有差异,请以英文原文为准。
The relation between thermal and electrical stress and the PD behavior of epoxy-resin transformers
The partial discharge (PD) behavior of epoxy resin transformer coils in a temperature range between -30 and 180 degrees C is discussed. In particular, the PD inception voltage, which is a very important parameter for the judgement of the PD characteristic of a transformer over the temperature range, is considered. The PD inception voltage is determined at different static temperatures in step tests. The tempering of the coils occurs from the outside by submerging the oil in tempered fluid,as well as from the inside, with the help of current losses. Models of HV coils of distribution transformers are used as specimens. The dependencies between the PD inception voltage of the coils and parameters such as wire insulation and inner or outer tempering are determined and discussed. The results of long-term tests in which five coils are stressed with a voltage of 1.75 kV at a temperature of 175 degrees C for a duration of one year are presented. During this time PD measurements with a sensitivity of 2 pC were carried out. >
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