输电导线脱冰跳跃高度实用简化计算公式

冰区输电线路杆塔塔头设计需要考虑绝缘间隙,其与导线脱冰最大跳跃高度直接相关。针对现有导线脱冰跳跃高度计算公式不适用于大档距大高差线路的问题,在已有研究成果基础上,重点针对大档距大高差线路,采用有限元方法模拟研究在不同线路结构参数和脱冰条件下导线的脱冰动力响应,通过分析数值模拟得到的导线冰跳高度与其脱冰前后弧垂差、线路档距和高差等的数据关系,采用非线性回归方法,得到计入线路档距和高差影响的导线脱冰跳跃高度工程适用简化公式,该公式适用于包括大档距大高差的线路,完善了公式的适用范围。

Simplified formula for jump height of transmission lines after ice-shedding

Insulation clearance should be taken into account in the tower design of transmission lines in an ice zone, which is closely related to the jump height of conductor lines after ice shedding. Because the existing formulas for jump height of conductor lines after ice shedding are inapplicable to the lines with large span length and evelation difference, this research focuses on the finite-element simulation of dynamic responses of transmission lines with large span length and elevation difference after ice shedding, and obtains the numerical data in relation to the jump height, its sag before and after ice-shedding, line span and evelation difference. Based on the numerical simulation results, an improved formula for jump height of transmission lines is proposed with nonlinear regression analysis, and the fomula is applicable to all the transmission lines with different span length and elevation.