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电网技术  2014 

±400kV青藏联网直流输电线路带电作业安全距离

DOI: 10.13335/j.1000-3673.pst.2014.10.043, PP. 2894-2899

Keywords: 青藏直流联网工程,高海拔,带电作业,安全距离,组合间隙

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Abstract:

青藏±400kV直流联网工程是世界上海拔最高的直流输电工程,其平均海拔为4400m,最高海拔达到了5300m。目前,对高海拔地区输电线路带电作业的研究很少,尤其是高海拔地区直流输电线路安全距离方面更是缺少相关数据。根据不同海拔地区±400kV直流输电线路塔头空气间隙放电特性曲线,计算了海拔3000~5300m的放电电压海拔校正系数,并和常用的海拔校正方法的计算结果进行对比分析。结合低海拔地区已有的±500kV输电线路带电作业的研究成果,计算分析了±400kV输电线路直线塔带电作业不同作业位置所需的最小安全距离和最小组合间隙。当过电压为1.7pu时,在海拔3000、4000、5000、5300m地区,±400kV青藏直流输电线路等电位作业人员对横担的最小安全距离分别为3.4、3.9、4.5、4.7m;等电位作业人员对侧面塔身的最小安全距离分别为2.9、3.4、4.0、4.2m;最小组合间隙距离分别为3.0、3.4、4.0、4.2m。研究结果可供±400kV青藏联网直流输电线路带电作业参考。

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