中文摘要：

紧凑型输电技术是我国近十几年迅速发展和应用的一项新技术，紧凑型输电线路与常规线路相比，具有提高自然输送功率、压缩线路走廊宽度、降低工程建设造价的特点，具有很大的经济效益和社会效益。为了配合我国西北地区750kV紧凑型输电工程的设计，通过仿真试验研究了750kV单回紧凑型线路直线塔窗内空气间隙在操作冲击和雷电冲击下的放电特性，并计算给出了不同海拔下空气间隙操作冲击下的放电概率。结果表明，操作波相地冲击放电电压为1611kV，符合绝缘要求。相地放电有很大的随机性，塔形设计合理。

英文摘要：

The compact power transmission technology is a new technology which is developed quickly and applied in China for recent years. Compared with conventional lines, the compact power transmission lines improve the delivery of natural power, compress the width of corridor, and have lower construction cost. This technology has great economic and social benefits. This paper studies the air gap discharging of 750 kV single circuit linear tower under switching impulse and lighting impulse,introduces the method for calculating the insulation flashover probability, and calculates them under different altitudes.