摘要
我国冬季混合凇冰灾频繁并严重威胁输电线路安全运行;覆冰后的导线表面会形成雨凇和雾凇的混合体,尖锐的冰柱会畸变冰面电场分布,进而使导线表面场强增大;为研究混合凇覆冰对导线表面场强的影响规律,在小型人工气候室内完成了对LGJ-185/25绞线混合凇覆冰后的参数测量,并根据混合凇形态建立电场分布模型,利用有限元法对导线覆冰后的表面场强进行计算。结果表明:混合凇形成的冰柱尖端会增大导线表面场强;随着覆冰程度的增加,导线表面场强会继续增大但速度却逐渐减慢并最终趋于饱和;所得结论可为混合凇频发地区的输电线路选型和设计提供理论依据。
Mixed-phase icing disaster in Chinese winter was so frequent which threats the safety operation of transmission lines seriously, the surface of wire will form a mixture ice shape by glaze and time, field strength on the surface of conductor was intensified significantly due to the field distribution was distorted by sharp icicle on ice. Therefore, in order to study on the regular of surface field distribution on wires when coated by mixed-phase ice, icing parameter of the Steel Core Aluminum Stranded wire by mixed-phase ice was measured in the Muhi-function Artificial Climate Chamber, then field distribution model was established according to the shape of mixed-phase ice, last but not least field density on the icicle tip was calculated by the finite element method. Results show that： icicle tip of mixed-phase ice can enlarge field density on conductor seriously. With the increasing of ice exten field strength on conductor surface will continue to increase with the pace slow down gradually whic t, h tends to saturation eventually. The conclusion can provide the selection reference for the overhead transmission line in mixed-phase ice area.
出处
《电瓷避雷器》
CAS
北大核心
2013年第5期1-6,共6页
Insulators and Surge Arresters
基金
国家重点基础研究发展计划(973计划编号:2009CB724502
2009CB724501)
国家重点实验室项目(编号:2007DA10512708101
2007DA10512708102)
关键词
导线
雾凇
冰树枝
电场分布
有限元法
stranded conductor
rime
ice-tree
field distribution
the finite element method
