采用扩径导线替代分裂导线的防冰方法

Anti-Icing Method of Using Expanded Diameter Conductor to Replace Bundle Conductor

输电线路覆冰对电力系统安全运行具有严重威胁,目前已有多种防冰除冰方法,但每种方法都有其局限性,对于一些微气象、微地形重覆冰地区尚未有较好的解决方法。与钢芯铝绞线相比,在传输能力相同的情况下,扩径导线具有更好的抗冰效果。为此该文提出采用扩径导线替代分裂导线防冰的方法。在该方法论证中,考虑电气因素,分析扩径导线临界起晕电压和表面电场分布特性,结果表明:其临界起晕电压低于运行电压,其表面电场低于分裂导线表面电场。自然覆冰试验结果表明:使用有效导电面积相同的扩径导线代替分裂导线,覆冰量减少约30%~80%,能显著提高抗冰强度,从而达到非人工干预的防止冰雪灾害的目的。

Icing of transmission line threatens the reliability of electric power system seriously. In recent years, although numerous anti-icing and de-icing methods were developed, this problem has not been totally solved in micro-meteorological and micro-topographic areas, due to the limitations of the proposed methods. Compared with aluminum conductor steel reinforced, the expanded diameter conductor, corresponds to a better anti-icing effect under the same transmission capacity. Therefore, this paper presented an anti-icing method by using expanded diameter conductor instead of bundle conductor. In this paper, the electrical factors were considered, the critical corona initiation voltage and surface electric field distribution characteristics of the expanded diameter conductor were analyzed. The results show that, the critical corona initiation voltage is lower than the operating voltage. The surface electric field of expanded diameter conductor is lower than that of the bundle conductor. Natural icing test results indicate that, the method of using expanded diameter conductor which has the same effective conductive area to replace bundle conductor can reduce the amount of icing quality by about 30%~80%. It can improve the anti-icing effect significantly, so as to achieve the purpose of anti-icing and mitigation without artificial intervention.