Abstract
This paper evaluates the applicability of the extended modal-domain (EMD) model in the calculation of lightning-induced voltages on parallel and double-circuit distribution lines. The influence of a real and constant transformation matrix and of the fitting technique required in the model on the induced-voltage waveforms is also investigated. It is shown that the EMD model presents good accuracy in most of the tested configurations. Also, in most cases the influence of the frequency selected for the calculation of the transformation matrix required in the EMD model is minimal. On the other hand, the requirement of using strictly real poles and residues and the use of the built-in fitting tool available in the Alternative Transients Program (ATP) have both a detrimental influence on the accuracy of the EMD model, at least in the investigated cases.
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