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A new general estimation curve for predicting the impulse impedance of concentrated earth electrodes

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1 Author(s)
Oettle, E.E. ; Nat. Electr. Eng. Res. Inst., Pretoria, South Africa

This is a further development of the experimental curve published by A.V. Korsuntsev (see Elektrichestvo, no.5, p.31-5 (1958)). The use of this curve does not require any knowledge of the critical soil ionization constant. The characteristic dimension of an electrode has been redefined to give a good resolution between two-dimensional and three-dimensional electrode geometries. The curve predicts the impedance approximately 6 μs after the onset of the impulse, which is representative of the impedance of electrodes at the time of the peak lightning current of first strokes

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Power Delivery, IEEE Transactions on  (Volume:3 ,  Issue: 4 )