750kV输电线路电晕损失海拔修正方法的研究

西北地区在建和投运的750kV输电线路多处于高海拔地区,其电晕损失现象较为明显。笔者以6×LGJ-400/50型导线为例,借助可移动电晕笼,在环境气候试验室中测量其大雨条件下、0～4000m海拔范围内电晕损失随海拔的变化关系,参考标准并利用最小二乘准则对测量数据进行拟合,提出两种不同形式的电晕损失海拔修正公式。

Altitude Correction Methods for Corona Loss of 750 kV Transmission Line

In the northwest region of China,most of the 750 kV transmission lines in use or under construction are located in high altitude areas,leading to obvious corona loss. This paper takes the six-bundle conductor 6×LGJ-400/50 as an example to measure its corona loss by using the corona cage in an environmental climate laboratory with heavy rain condition,and the relation between corona loss and altitude within 0～4 000 m is achieved. Then reference standard and least-square method are employed to fit the measured data. Consequently,two different altitude correction formulas for corona loss are suggested.