不同覆冰类型绝缘子串的泄漏电流特征分析

发布时间：2018-04-22 11:30

本文选题：泄漏电流 + 绝缘子　；参考：《电网技术》2017年11期

【摘要】：对绝缘子泄漏电流的分析是进行覆冰闪络预警的一个重要方法,而绝缘子的泄漏电流特征除与绝缘子串本身特性有关之外,还受到覆冰类型的影响。对玻璃绝缘子进行人工覆冰试验,研究了雨凇、混合凇和雾凇条件下,绝缘子在覆冰期和融冰期的泄漏电流变化趋势,以及不同阶段冰层电阻变化规律;通过FFT分析,研究了泄漏电流的谐波组成和阻性容性分量在融覆冰不同阶段的分布规律,定义了用于定量评价绝缘子覆冰状态的融覆冰状态判定系数。研究结果表明,泄漏电流在覆冰期没有显著变化,在融冰前期迅速上升,中后期保持平稳或略有上升;覆冰期冰层电阻与覆冰类型关系不大,融冰期雾凇和混合凇电阻小于雨凇。覆冰绝缘子泄漏电流主要成分为基波分量,基波阻性分量和容性分量与全电流比值的相对大小关系不同时,绝缘子表面冰层状态不同,从而据此判定绝缘子所处的融覆冰状态,对覆冰闪络进行预警。
[Abstract]:The analysis of insulator leakage current is an important method for ice flashover warning, and the characteristics of insulator leakage current are not only related to the characteristics of insulator string itself, but also affected by the type of icing. Through artificial icing test of glass insulator, the variation trend of leakage current and the change rule of ice layer resistance of insulator in ice and melting period were studied under the condition of rime, mixed rime and rime, and the change rule of ice layer resistance was analyzed by FFT. The distribution of harmonic components and capacitive components of leakage current in different stages of ice melting is studied, and the determination coefficient of melting ice state is defined to quantitatively evaluate the ice state of insulators. The results showed that the leakage current did not change significantly during the ice cover period, but increased rapidly in the early stage of melting ice, kept steady or slightly increased in the middle and late stages, and had little relationship with the type of ice coating, the resistance of the ice layer was not related to the type of ice coating in the ice cover period. The resistance of rime and mixed rime is less than rime in melting ice period. The leakage current of icing insulator is mainly composed of fundamental wave component, the relative relation between fundamental wave resistance component and capacitive component and the ratio of total current is different, and the ice layer state on the surface of insulator is different, so the melting and icing state of insulator is determined. Warning of icing flashover.
【作者单位】：国网四川省电力公司电力科学研究院;清华大学深圳研究生院;
【基金】：中国博士后科学基金面上资助(2014M562506XB)~~
【分类号】：TM216

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