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电网技术  2006 

电位降法测量接地电阻时的电流极引线长度分析

, PP. 41-44

Keywords: 变电站,接地电阻测量,全球定位系统,电位降法,电流极引线,高电压绝缘技术

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Abstract:

讨论了电流极引线长度对变电站接地电阻测量误差的影响,分析得到了不同土壤结构所要求的电流极引线长度。采用反向法测量接地电阻时,测量得到的接地电阻比真实接地电阻要小,但可将反向法测量得到的接地电阻作为变电站接地电阻测量值的下限。采用全球定位系统(globalpositioningsystem,GPS)确定测量电极与接地网之间的距离后,能够根据电位降法比较准确地测量接地电阻。实际测量结果表明,如果电流极引线过短,可通过辅助分析的方法得到实际接地电阻的电压极补偿点位置。

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