直流电场强度对导线雨淞覆冰及其电晕损失的影响

Influence of DC Electric Field Intensity on Conductor Glaze Icing and Its Corona Loss

输电线路运行时导线表面的电场强度是影响导线覆冰及其电晕放电过程的重要因素,但现有文献的研究对象多为交流输电线路。为适应中国直流输电线路的建设浪潮,文中在电晕笼中采用人工带电模拟覆冰的方法研究了覆冰电场强度对导线雨凇覆冰形态以及电晕损失特性的影响规律。研究表明:覆冰电场强度对导线雨淞覆冰形态具有显著的影响,覆冰时导线表面电场强度越高,形成的雨淞覆冰导线的覆冰重量和冰凌长度越小、冰凌间距越大、覆冰厚度呈先增大后减小的规律。高覆冰电场强度下形成的雨淞覆冰导线的电晕损失更小,此外,单位长度雨淞覆冰导线的电晕损失与标称电场强度之间服从幂函数形式的经验公式。

The electric field intensity of surface of conductor of transmission line in operation is an important factor to affect the icing coating and its corona discharge process of the conductor.The study object of existing literature,however,is mostly AC transmission lines.In order to suit the construction wave of DC transmission lines in China,the artificial energized simulation ice coating method is adopted in this paper to study the influence of ice coating electric field intensity on conductor glaze icing coating and its corona loss in a corona cage.The study shows that the icing coating electric field intensity has a significant influence on the glaze icing configuration.In case of ice coating,the higher the electric field intensity on the surface of the conductor is,the smaller the icing weight and icicle length of the formed glaze ice⁃covered wire is,the larger the icicle spacing is,and the ice coating thickness of the conductor increases first and then decreases.The corona loss of glaze ice coating conductor formed under high icing electric field intensity is smaller.In addition,the relationship between corona loss and nominal electric field intensity of glaze ice coating conductor of unit length follows the empirical formula of power function.