不均匀覆冰不平衡张力计算及分析

Calculation and analysis of unbalance tension of transmission line

以架空线路的独立耐张段为对象,从30mm冰区和20mm冰区两种工况并采用相同导线型号展开研究。首先在研究中简化计算模型,按耐张段内档距相等、悬点等高进行计算,避免了复杂重复计算。其次在计算分析大量不平衡张力计算数据的基础上,采用图解法计算了30mm冰区和20mm冰区两种工况下导线的不均匀覆冰不平衡张力百分比。通过对比分析,一般情况可按导、地线最大使用张力百分数取值,但对微地形、微气象段仍需按覆冰率进行计算。

Taking the independent tension section of overhead lines as the object,the two conductor cases in the 30mm ice area and the 20mm ice area were studied with the same conductor type.First,the calculation model is simplified in the research,and the calculation is carried out according to the equal span length and the hanging point height in the tension section,avoiding complex repeated calculation.Secondly,on the basis of calculation and analysis of a large number of unbalance tension calculation data,the uneven tension percentage of the unevenly covered ice under the two operating conditions of the 30mm ice zone and the 20mm ice zone are calculated by the graphical method.Through comparison and analysis,the general situation can be taken according to the maximum percentage of tension used by the guide and ground wire,but the micro topography and micro meteorological section still need to be calculated according to the ice coating rate.