Lightning surge impedance measurement on control building using Electromagnetic Transient Program

This paper demonstrates the electromagnetic behavior of transient response of lightning surge strike on control building and power system. Surge responses of control building are analyzed using electromagnetic transient program (EMTP). A direct lightning stroke to a building may cause damages or interference in the operation of electronic equipment inside the structure and even be dangerous for the people in the more critical case. In order to decide on an efficient lightning protection system, it is very important to determine the lightning current distribution in the building. The accuracy of this method is shown to be satisfactory with the simulation result based on the numerical electromagnetic code (NEC-2) that were carried out on control building as reduced scale model. Lightning over-voltages must be taken into account when designing a control building. In the world, especially in Japan various studied, therefore, have been done to measure the characteristics of the line components and to develop their equivalent circuit models for the electromagnetic transient program (EMTP) simulations. Surge impedance is calculated by both the vertical and horizontal stroke analyses method.