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绝缘护套包覆对500kV输电线路导线与杆塔间空气间隙击穿特性的影响

DOI: 10.13336/j.1003-6520.hve.2015.07.027, PP. 2315-2320

Keywords: 输电线路,风偏,间隙,击穿,绝缘护套,导线,室温硫化硅橡胶

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Abstract:

为有效解决输电线路风偏放电问题,对输电线路及金具进行绝缘包覆以提高放电击穿电压,仿真和试验研究了绝缘护套包覆对500kV输电线路模拟杆塔中导线与塔身间空气间隙击穿特性的影响。试验过程中,对单导线及4分裂导线分别施加1min1.1倍工频相电压(318kV),通过改变导线与杆塔间距研究不同间距下的耐压情况。仿真结果表明,导线包覆绝缘护套后,其表面最大场强随间距增大而降低;裸导线空气间隙击穿电压与间隙距离呈线性关系;单导线包覆绝缘护套后可缩短13.6%的间隙距离,4分裂导线包覆绝缘护套可缩短9.3%的间隙距离;击穿点均位于绝缘盒连接处,其原因是此处以室温硫化硅橡胶填补缝隙密封时施工密封不严。绝缘护套包覆导线及金具措施可有效提高输电线路导线与杆塔间空气间隙击穿特性,但应严格控制施工工艺以提高实际效果。

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