目前架空输电线路线间电气距离计算精度低、效率不能满足设计要求。利用悬链线计算方法、空间坐标转换、OpenGL函数库等设计了架空输电线路三维电气距离校验系统。该系统实现了多种工况下单回、同塔双回、同塔多回线路中同回路相间及不同回路相间三维空间的电气距离校验功能；实现了铁塔、耐张和悬垂绝缘子串、悬链线的三维空间模型的显示及动态交互展示功能；实现了不同设计条件下三维空间的耐张绝缘子串摇摆角自动计算，悬链线张力的自动计算。该系统可以为输电线路的路径选择、铁塔规划和定位校验提供技术支持，可提高设计人员的效率和降低设计人员的劳动强度，具有较强的实用性。

In present calculation of electric distance for overhead transmission line, the accuracy is low and the calculation efficiency cannot meet the design requirement. Therefore, three-dimensional calibration system of electric distance for overhead transmission line is developed based on catenary calculation method, space coordinate transform and OpenGL library. In the system, the three-dimensional electric distance calibration is implemented between phases on the same and different circuit in transmission lines with single-, double-and multi-circuit on the same tower. In addition, three-dimensional models and dynamic interactive of tower, insulator and catenary are displayed. The swing angle of insulator and tension of catenary can be automatically calculated under different design conditions. The system is very practical in improving the efficiency and reducing labor intensity of designer, and provides technical references for path selection, layout and locating calibration of towers in transmission lines.