Frequency analysis of the induced effects due to the lightning stroke radiated electromagnetic field

The effects of a lightning stroke to the protection system of the control building of an industrial plant are investigated. The results of a frequency-analysis study of effects connected with point values of the electromagnetic field generated within the building or due to the presence of radiation fields, namely, fields whose harmonic components, characterized by small wavelengths compared to the dimensions of the 'victim' circuit, assume nonnegligible values, are reported. These effects are calculated using a procedure based on a field approach. Characterization of the electromagnetic field is ensured by a numerical procedure that permits simultaneous simulation of the protection system and analysis of the electromagnetic field by means of the method of moments used by various authors for the study of direct lightning strokes to thin-wire structures. Two distinct points of impact of the lightning stroke to the protection system are considered, and the results are compared.<
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