Lightning impulse polarity effect in ester oils and mineral oil for transformer applications

Pavitra Sharma, Ritika Agarwal, Anjali Uppal, C. Narasimhan, Girish A Morde, Jeyabalan Velandy
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引用次数: 2

Abstract

Ester oil is becoming increasingly popular as a potential alternative to mineral oil due to eco-friendly, fire safety and higher continuous over loading capability in comparison to conventionally used mineral oil. The high interest on ester oil has led to several studies aimed at prediction of their dielectric breakdown voltage for transformer applications. In this paper, to evaluate the effectiveness of ester oil as a dielectric for transformers the withstand voltages of ester oil under both positive and negative polarities of lightning impulse waveshape in comparison with mineral oil are evaluated for various oil gaps using statistical analysis. In addition, the variation of streamer velocity with various gap distances between electrodes in mineral oil, natural ester oil and synthetic ester oil under different polarity of impulse are extracted to analyze the streamer behavior in ester oil. Finally, the ratios of breakdown voltage, streamer velocity of ester oil with respect to mineral oil are calculated from the experimental results under both positive and negative polarities which serves as a point of reference for insulation design of transformer. Sphere-needle electrode configuration is used to create nonuniform field under lightning impulse stress. The breakdown voltage is determined by multiple level test method and best estimate of 3-parameter Weibull distribution is used for 1% breakdown probability due to breakdown voltage.
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变压器用酯油和矿物油的雷电脉冲极性效应
与传统矿物油相比,酯油作为矿物油的潜在替代品越来越受欢迎,因为它具有环保、防火安全以及更高的连续过载能力。对酯油的高度关注导致了一些旨在预测变压器介质击穿电压的研究。为了评价酯油作为变压器介质的有效性,本文采用统计分析的方法,比较了不同油隙下酯油与矿物油在雷电脉冲波形正负极性下的耐压。此外,提取了矿物油、天然酯油和合成酯油在不同脉冲极性下,随电极间隙距离的变化速率,分析了酯油中的拖缆行为。最后,根据实验结果计算了酯油在正极性和负极性下与矿物油的击穿电压、流速之比,为变压器绝缘设计提供了参考。采用球针电极结构在雷击应力作用下产生非均匀场。击穿电压采用多级试验法确定,当击穿电压引起的击穿概率为1%时,采用三参数威布尔分布的最佳估计。
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