基于雨水混合物模型的平抗直流套管的雨闪故障分析

发布时间：2018-01-08 08:02

本文关键词：基于雨水混合物模型的平抗直流套管的雨闪故障分析　出处：《电工技术学报》2017年21期 　论文类型：期刊论文

【摘要】：雨闪故障一直是电力系统外绝缘研究领域的热点。结合有限元方法,进行500 k V直流系统平波电抗器出线套管的雨闪故障分析。通过引入雨水在空气中所占体积比的方法,将水滴和空气等效成单一的混合物介质。通过流体场-电场的耦合分析实现了下雨条件下套管电场的求解。计算表明,下雨时套管上端更易受到雨水的碰撞、集聚,致使局部电场强度增大,此时套管上端表面电场强度相比于干燥环境下更高,更易形成闪络。通过与雨闪故障现场图片对比,仿真结果与实际事故中发生闪络的位置一致,验证了考虑雨水混合物模型在雨闪故障分析中的准确性。
[Abstract]:Rain flashover fault has always been a hot topic in the field of power system external insulation research, combined with finite element method. The rain flashover fault analysis of 500kV DC system flat-wave reactor outlet casing is carried out. The volume ratio of Rain Water in the air is introduced. The water droplet and air are equivalent to a single mixture medium. Through the coupling analysis of fluid field and electric field, the electric field of the casing is solved under the condition of rain. The calculation shows that the upper end of the casing is more vulnerable to Rain Water's collision when it rains. Agglomeration results in the increase of the local electric field intensity. The electric field intensity of the upper end of the casing is higher than that of the dry environment, and it is easier to form flashover. The simulation results are consistent with the location of flashover in the actual accident, which verifies the accuracy of considering the Rain Water mixture model in rain flashover fault analysis.
【作者单位】：国网湖北省电力公司电力科学研究院高压电气设备现场试验技术国网重点实验室;武汉大学电气工程学院;强电磁工程与新技术国家重点实验室(华中科技大学);
【分类号】：TM216.5
【正文快照】： 0引言雨闪在我国330~500 k V交、直流系统的外绝缘事故中占相当大的比重。1996年7月,湖北省葛洲坝换流站交流系统中的电容分压器和直流系统中的耦合电容器套管在暴雨中同时发生雨闪。2005年5月大雨天气下,广西省天生桥换流站直流分压器发生雨闪[1]。据统计,±500 k V换流站系

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