IMPULSE IMPEDANCE OF GROUNDING GRIDS.

被引：0
|
作者：
Gupta, B.R.
Thapar, B.
机构：
来源：
| 1979年
关键词：
LIGHTNING PROTECTION - Electrodes;
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暂无
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摘要：
When an impulse current is fed to a grounding system, its impulse impedance is defined as the ratio of the peak value of the voltage developed at the feeding point to the peak value of the current. A method and an empirical formula to calculate the inductance of square grounding grids fed either at the center or at one of the corners is presented. Empirical formulae for the effective are and impulse coefficient for center-fed and corner-fed square grids are determined. The validity of the analytical method has been verified experimentally with model tests. It is shown that the effect of soil ionization on the impulse impedance of grounding grids can be ignored for grounding grids in high-voltage substations.
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