基于泄漏电流特性的交流悬式绝缘子覆冰闪络特性
发布时间：2018-08-14 17:03
【摘要】：为了揭示覆冰闪络特性以提高闪络预测结果的准确性,对比分析了长串和短串覆冰绝缘子交流闪络过程的泄漏电流特性。根据泄漏电流时域波形将绝缘子覆冰闪络过程分为4个阶段,选取第3阶段的准恒定特征电流(IW)和第4阶段闪络前最后一周期泄漏电流峰值(IFT)作为闪络预测的2个重要特征量,并研究了其与覆冰严重程度、污秽度和覆冰水电导率的关系。结果表明:IW和IFT随覆冰水电导率的增加近似线性增大,但几乎不受污秽度影响;2者随覆冰严重程度的增加而增大,当伞裙间隙被冰棱完全桥接时达到饱和值;IW可以用于覆冰闪络的早期预警,而IFT可作为临界闪络判据。
[Abstract]:In order to reveal the characteristics of icing flashover to improve the accuracy of flashover prediction, the leakage current characteristics of long and short series ice insulators during AC flashover were compared and analyzed. According to the time domain waveform of leakage current, the insulator icing flashover process is divided into four stages. The quasi-constant characteristic current (IW) of the third stage and the peak leakage current peak value (IFT) of the last cycle before the fourth stage flashover are selected as two important characteristics for the flashover prediction. The relationship between the degree of ice coating, pollution and conductivity of iced water was studied. The results show that the IFT and the IW increase linearly with the increase of the conductivity of ice-covered water, but increase with the increase of the degree of icing severity. When the gap of umbrella skirt is completely bridged by ice edge, the saturation value of IW can be used for early warning of ice flashover, and IFT can be used as critical flashover criterion.
【作者单位】： 西安交通大学电气工程学院;中国电力科学研究院;国网天津市电力公司城南供电分公司;
【基金】：国家电网公司科技项目(GY71-13-034)~~
【分类号】：TM216
本文编号：2183525
[Abstract]:In order to reveal the characteristics of icing flashover to improve the accuracy of flashover prediction, the leakage current characteristics of long and short series ice insulators during AC flashover were compared and analyzed. According to the time domain waveform of leakage current, the insulator icing flashover process is divided into four stages. The quasi-constant characteristic current (IW) of the third stage and the peak leakage current peak value (IFT) of the last cycle before the fourth stage flashover are selected as two important characteristics for the flashover prediction. The relationship between the degree of ice coating, pollution and conductivity of iced water was studied. The results show that the IFT and the IW increase linearly with the increase of the conductivity of ice-covered water, but increase with the increase of the degree of icing severity. When the gap of umbrella skirt is completely bridged by ice edge, the saturation value of IW can be used for early warning of ice flashover, and IFT can be used as critical flashover criterion.
【作者单位】： 西安交通大学电气工程学院;中国电力科学研究院;国网天津市电力公司城南供电分公司;
【基金】：国家电网公司科技项目(GY71-13-034)~~
【分类号】：TM216
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