雨凇覆冰对输电线路分裂导线起晕电压的影响

发布时间：2018-06-24 05:55

本文选题：输电线路 + 分裂导线　；参考：《高电压技术》2014年02期

【摘要】：雨凇覆冰后的输电线路导线表面电场会发生畸变从而降低起晕电压值,但目前国内外尚未深入分析雨凇覆冰对导线电晕特性的影响规律,且缩比导线模型所得结论与工程实际存在较大差异。为探求雨凇覆冰导线的电晕特性,在人工气候实验室内完成了3种分裂导线雨凇覆冰后的交流电晕试验,结合紫外成像与拟合法对导线雨凇覆冰后的电晕特性进行了测量,建立了有限元模型并分析了导线表面电场强度以弥补雨凇电晕研究的空缺。结果表明:雨凇覆冰会降低裸导线起晕电压值约50%;导线表面的起晕电压会在最初的15 min内下降较快,之后会随着雨凇覆冰程度的增加而继续下降,但其速度逐渐饱和;相同雨凇覆冰时间内分裂子导线越多则起晕电压值越高;覆冰水电导率的大小并不会直接改变或影响雨凇覆冰表面形态,但起晕电压值却会随着覆冰水电导率的增加而持续降低。所得结论可供雨凇覆冰地区架空输电线路的设计和选型参考。
[Abstract]:The electric field on the surface of transmission lines after rime is covered with ice will be distorted so as to reduce the corona voltage. However, at present, the influence of rime on the corona characteristics of transmission lines has not been thoroughly analyzed at home and abroad. The conclusion of the model is quite different from that of engineering practice. In order to find out the corona characteristics of rime coated conductors, the AC corona test after rime icing of three kinds of split conductors was completed in the artificial climate laboratory. The corona characteristics of rime after rime were measured by combining ultraviolet imaging and fitting method. The finite element model is established and the electric field intensity on the conductor surface is analyzed to make up for the lack of the research on rime corona. The results show that the corona voltage of the bare conductor will be reduced by about 50, the corona voltage on the surface of the conductor will decrease rapidly within the first 15 min, and then will continue to decrease with the increase of the degree of rime icing, but the speed will gradually saturate. The more splitters in the same time of rime icing, the higher the corona voltage, and the more conductivity of icing water does not directly change or affect the surface morphology of rime. However, the corona voltage will continue to decrease with the increase of water conductivity. The conclusions can be used as reference for the design and selection of overhead transmission lines in rime-covered area.
【作者单位】：重庆大学输配电装备及系统安全与新技术国家重点实验室;
【基金】：国家重点基础研究发展计划(973计划)(2009CB724502;2009CB724501)~~
【分类号】：TM752.5

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