特高压直流输电线路耐张绝缘子串对导线应力和弧垂特性的影响分析

Analysis on The Influence of Strain Insulator String of UHV DC Transmission Line on Stress and Sag Characteristics of Conductor

特高压线路由于耐张串串重较重,串长较长,耐张串重与档内导线重的比值较大,对小耐张段的导线弧垂特性及张力将产生较大影响。为准确计算小耐张段的导线弧垂及张力,利用excel编制了计算程序。通过分析计算得出在特高压工程设计中耐张串对小耐张段导线弧垂及应力影响较大,越靠近耐张塔,耐张串弧垂变化越大,另外,耐张塔所在档距越小,耐张串引起的张力差越大,因此在实际工程设计中,需考虑耐张串重对弧垂及张力的影响问题。

Due to the heavy and long strain insulator string of the UHV transmission line the ratio between the straininsulator string＇ s weight and the conductor＇ s weight inside the transmission line is quite large bringing about great influenceon the sag characteristic and tensile force of the conductor of the short strain section. In order to accurately calculate the sagcharacteristic and tensile force of the conductor of the short strain section a calculation program is compiled with Excel.Through analysis and calculation it is concluded that the strain insulator string has great influence on the sag characteristicand stress of the conductor of the short strain section in UHV engineering design. The closer to the strain tower the greaterthe sag variation of strain insulator string is. The smaller the span of the strain tower is the greater the tensile force differencecaused by the strain insulator string is. Therefore the impact of the strain insulator string＇ s weight on sag and tensile forceshall be considered in practical engineering design.