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- W1948830977 abstract "In order to evaluate the performance of a grounding system against lightning or fault currents including high frequency components, the grounding impedance should be considered rather than its ground resistance. Recently, some researches on the evaluation and modeling of the grounding impedances have been carried out, but the results have not been yet sufficient. This paper deals with the frequency dependence of the resistivity and relative dielectric constant of sand associated with water contents. As a result, the resistivity of sand is getting lower with increasing water content, and it is nearly independent on the frequency in the range of less than 1㎒, and is decreased over the frequency range of above 1㎒. Also, the relative dielectric constant is rapidly decreased with the frequency in the range of less than 10㎑, but it is nearly not dependent on the frequency over the frequency range of 10㎑. It was found from this work that the frequency dependance of resistivity and relative dielectric constant of soil should be considered in designing the grounding systems for protection against lightning or surges." @default.
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- W1948830977 date "2009-05-01" @default.
- W1948830977 modified "2023-09-24" @default.
- W1948830977 title "모래의 수분함유량에 따른 비저항 및 비유전율의 주파수 의존성" @default.
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