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土壤介电频变特性试验研究及其对接地极冲击特性的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.16.029, PP. 4247-4253

Keywords: 土壤,冲击接地,介电谱,频变特性,有限元方法

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Abstract:

接地系统是维护电力系统安全可靠运行的重要基础设备。从频域介电谱理论出发,开展了土壤频变特性的研究。为了降低电极极化效应影响,配制了含水量较高、电阻率较低的土壤样品。然后进行了不同含水量、不同含石量的土壤介电谱的测量,对测得的数据进行函数拟合并代入有限元冲击特性模型中进行计算,分析了土壤电气参数的频变特性对冲击接地性能的影响。结果表明:冲击电流作用下,接地极周围土壤的介电常数随频率在低频段近似符合幂函数规律,在高频段近似符合指数函数规律;在同一频率点,土壤的介电常数随土石比例和含水量的降低而减小;考虑土壤介电常数频变特性后,冲击电流作用下接地极暂态电阻值与介电常数恒定时相比有显著的差异。

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