Abstract:

With the expansion of overhead transmission lines， there has been an increasing number of high-capacity， extra-high voltage， and long-distance transmission line sections， making crossover transmission lines a more common occurrence. The electrical safety gap of crossover lines has become a critical factor affecting the safety of power grid lines. Therefore， a general expression for the spatial configuration of overhead conductors in three-dimensional space was constructed on the basis of a catenary model， and the critical segment method was employed to calculate the minimum electrical gap value within the lines. Then， by integrating the Unity3D engine with the minimum gap calculation program， virtual simulation was conducted， the layout effects of crossover sections under different parameter settings and the locations of flashover faults in the lines were demonstrated by using tower and conductor models in three-dimensional space， and based on the virtual simulation of electrical gap， the minimum gaps under different line parameters were solved. Simulation results indicate that the line crossover angle and the line icing have significant influence on the minimum gap of the lines， validating the effectiveness of the critical segment method and virtual experiments.

Key words: crossover transmission lines, electrical safety gap, critical segment method, Unity3D, virtual simulation

摘要：

随着架空输电线路规模的扩大，各种大容量、超高压、长距离输电线路区段越来越多，导致输电线路交叉跨越现象越来越普遍，交叉跨越线路的电气安全间隙成了影响电网线路安全的重要因素。因此，基于悬链线模型构建三维空间中架空导线空间位形的通用表达式，并采用关键节段法求解线路中的最小电气间隙数值。然后，结合Unity3D引擎与最小间隙计算程序进行虚拟仿真实验，通过杆塔和导线模型在三维空间中展示不同参数设置下的交叉跨越区段布局效果以及线路发生闪络故障的位置，并基于电气间隙虚拟仿真实验，求解不同线路参数下的最小间隙。仿真实验结果表明，线路交叉角和线路覆冰对线路最小间隙的影响显著，验证了关键节段法和虚拟实验的有效性。

关键词: 交叉跨越输电线路, 电气安全间隙, 关键节段法, Unity3D, 虚拟仿真