海拔3000m以上地区750kV输电线路带电作业安全距离分析

Analysis of Safety Distance for Live Working on 750 kV Transmission Line in Areas With Altitude Over 3 000 m

为确定我国西北海拔3 000~5 000 m地区750 k V输电线路带电作业所需的安全距离,首先对低海拔地区750 k V单回酒杯塔和同塔双回输电线路带电作业的试验数据进行对比,结果表明可将两种不同塔型统一至同一塔型下进行分析;然后采用常用海拔校正方法和海拔0 m及4 300 m地区750 k V塔头空气间隙放电电压的试验数据,得到海拔1 000~5 000 m地区的海拔校正系数,并计算海拔1 000~5 000 m地区典型作业位置所需的安全距离和组合间隙距离。通过与现有标准对比分析,推荐海拔3 000~5 000 m地区典型作业位置所需的最小安全距离,最小组合间隙距离。研究结果为海拔3 000 m以上地区750 k V输电线路带电作业的开展提供技术依据。

In order to determine the required safety distance for live working on 750 kV transmission lines in regions at altitudes of 3 000~5 000 m in northwest China, first of all, test data of live working on 750 kV single-circuit cupulate-type tower and 750 kV one-tower double-circuit transmission line in areas at low altitudes are compared, and the results show that the two different towers can be unified into a same tower type;then by using the conventional altitude correction methods and the test data of 750 kV tower head air-gap discharge voltage in areas at the altitudes of 0 m and 4 300 m, the altitude correction factors of regions at altitudes of 1 000~5 000 m are obtained;in addition, the required safety distances and combined gap distances of the typical operating positions in regions at altitudes of 1 000~5 000 m are calculated. By comparing with the existing standard, the required minimum safety distances and minimum combined gap distances of the typical operating positions in regions at altitudes of 3 000~5 000 m are recommended. The results could provide technical basis for live working on 750 kV transmission line in areas with altitude over 3 000 m.