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±800kV特高压直流输电线路绝缘配合的差异化

DOI: 10.13336/j.1003-6520.hve.2015.05.042, PP. 1726-1731

Keywords: ±,800,kV,特高压直流,绝缘配合,差异化,过电压,海拔高度

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Abstract:

在直流输电系统设计中,绝缘配合是直流线路设计的重要环节。为此对±800kV输电线路的绝缘配合差异化进行了研究,给出了直流线路绝缘配合差异化技术的概念和方法,并分别就线路绝缘配置、导线对杆塔空气间隙距离和线路极间距离的差异化进行了研究。给出了不同污秽条件、不同海拔高度、不同绝缘子材质、不同绝缘子型号条件下,瓷绝缘子(I串、V串和耐张串)和复合绝缘子的差异化配置方案;确定了不同过电压倍数、不同海拔高度下导线对杆塔的空气间隙距离和最小极间距离;给出了不同污秽条件、不同海拔高度下的复合绝缘子串长和串长所需极间距离;确定了不同海拔高度、不同分裂间距、不同导线型号时,满足电磁环境限值要求所需的最小极间距离。研究结果可为±800kV直流输电线路的差异化绝缘配合提供指导,对提高特高压直流输电线路的经济性和科学性具有重要意义。

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