带电雾凇覆冰后分裂导线电场分布模型分析

Study of the Model of Electrical Field Distribution of Bundle Conductor After Energized Rime Icing

雾凇覆冰后的导线表面变得极为粗糙,冰树枝的生长将使导线表面电场发生严重畸变,从而增大导线表面电场,对电力系统安全运行造成严重危害。本文在多功能人工气候试验室内完成了对单、双及三分裂导线不同覆冰程度带电雾凇覆冰参数试验,并根据冰树枝形态变化建立有限元模型,再利用有限元分析法进行仿真分析。结果表明：雾凇冰树枝尖端将严重增大分裂导线表面电场,雾凇形成的冰树枝越长越尖则引起导线电场畸变越严重;覆冰完成后导线表面电场在覆冰电场增加过程中呈波动趋势;相同电场下覆冰,覆冰程度的增加会减小导线表面电场,但减小速度逐渐减慢;分裂数越多的导线覆冰后表面场强越低。

Rime makes conductor surface become extremely rough, growth of ice tree can distort the electrical field seriously and cause harm to safe operation of the power system. Therefore a series test for single, double and triple bundle conductors are implemented in the artificial climate chamber, combining with the rime morphology to establish icing trees＇ electrical field model, using finite element method for simulation analysis. The results shows that the tip of icing tree will seriously increase the bundled conductor＇surface electrical field. Ice-tree growing longer and sharper will make the electric field distorted more serious. Conductor surface electrical field increases fluctuant with the icing electric increasing. More sub-conductors will get lower surface electrical field than others.