Comparison between measurements and simulations for induced voltages at sealing unit of insulated down-conductor

In this paper measurements and corresponding both network and FEM models for investigations of the behaviour of insulated down-conductors are presented. Special focus here is given to the sealing unit of the insulated down-conductor where surface discharges could occur because of high potential differences between the head piece and the equipotential bonding element during the conduction of lightning currents. In contrast to other works, here electric stress for testing is generated by impulse currents themselves with their high amplitude and steepness, which are flowing through the down-conductor. Thus, electric stress arises from the inductive voltage drop originated by self- and mutual inductances similar to reality. The objective is hereby to build up an equivalent network circuit…