The present paper aims to illustrate the influence of the main factors which affect the selection and installation of an SPD for the protection of electrical and electronic systems against overcurrent and overvoltage due to direct lightning flash to a structure. The two most typical SPDs are considered, namely switching and limiting type. Simple rules are established for the selection of effective SPD with regard to the discharge current, its protection level and location. © 2012 IEEE

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The paper intends to give a contribution to the investigation on the expected surge current, peak value and shape, due to lightning electromagnetic impulse (LEMP) by flashes to the structure for the surge protective device (SPD) proper selection in order to assure electronic apparatus operation. The obtained results are discussed with the SPD requirements of international standard [1]. © 2012 IEEE

In the present paper a circuit model is proposed, and validated, to simulate a Lightning Protection System (LPS) in which the distances berween the down-conductors and berween the successive horizontal interconnecting rings are varied within a wide range of values. By the systematic application of the circuit model, solved by numerical methods, approximated expressions of current share functions are deduced. By means of such functions it is possible to identify how the lightning current is subdivided among the different conductors of an LPS with varying both the geometric configuration of the system and the typology of the grounding system. The share functions are validated by a series of experimental tests carried out on a real system placed on a building for its protection.

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