输电线路导线不均匀覆冰时不平衡张力的影响因素分析

输电线路导线不均匀覆冰会使导线产生不平衡张力,进而造成铁塔倒塌、塔头破坏、导线损坏等事故。本文以湖北超高压公司宜昌超高压局所辖的三峡右2—蔡家冲Ⅰ回500 kV输电线路作为研究对象,分别从不均匀覆冰杆塔档数、档距、相邻档的高差及悬垂绝缘子串长度等方面分析计算各因素对1个耐张段内一相导线所受不平衡张力的影响。结果表明,导线不均匀覆冰导致其所受的不平衡张力随档距的增加而增大,而随悬垂绝缘子串长度及相邻杆塔高差的增加而略有减小,不均匀覆冰档的档数对不平衡张力的影响具有随机性。根据结论,对中(重)冰区架空线路设计提出建议。

Influencing Factors Analysis of Unbalanced Tension on Overhead Transmission Line Icing Non-uniform

Transmission line with non-uniform ice will cause unbalanced line tension, causing the collapse of iron tower, tower head line damage and transmission line damage. This paper takes Hubei EHV company of EHV Bureau of Yichang under the jurisdiction of the Three Gorges Right 2--Cai Jia Chong I back to 500 kV transmission line as the research object, and analyses the unbalanced line tension and Ice-shedding from such factors： uneven ice location, differences of tower distance changes, height differences and so on. The results show that uneven line ice cause that, with the tower distance increasing, unbalanced line tension increases, and with height differences increasing, unbalanced line tension reduces. The effect of the number of uneven line ice on unbalanced line tension is random. According to the conclusion, giving the advice of transmission line designing, which is in heavy icing area.