Procedure for the design of lightning protection systems for external lightning protection of buildings and systems

摘要

Process for the design of lightning protection systems for external lightning protection of buildings and systems, whereby at least partially the lightning current arrester of the lightning protection system is designed as an insulated, electrical conductor with a conductive layer or covering of the insulation and there are conductive structures in the respective building or the respective system, which are potentially a in the case of a lightning current to be diverted are exposed to induction and in this regard the conductive layer on the insulated discharge device forms a secondary loop with the respective conductive structure, with the following steps: - Analysis of the spatial position of the conductive structures in the building or the respective system to be protected and determination of possible Secondary loops; - Determination of critical distances of the isolated discharge device and estimation of the induction effect in the secondary loop, based on standard lightning surge current values for the range of the crit ical distances, which cannot be changed by increasing the separation distance, taking into account the total length of the isolated discharge device and the resulting total displacement current; - Comparison of the estimated, induction-related possible maximum circulating current in the secondary loop with an acceptable limit value; - Modification of the isolated discharge in the event of an expected one Exceeding the limit value through a targeted increase in the resistance value of the conductive layer or sheath applied to the insulation of the down conductor, at least in sections, with the upper limit of the increase in resistance being predetermined by the field strength of the sliding discharge in the respective section changed in terms of resistance value.