| Title |
Problems and Countermeasures in Installation of Down Conductor Systems |
| Authors |
Bok-Hee Lee ; Dong-Moon Lee ; Sung-Man Kang ; Ju-Hong Eom ; Seung-Chil Lee ; Chang-Hwan Ahn ; Dong-Cheol Jeong |
| Abstract |
This paper describes the technical issues of the domestic standard and guideline for lightning protection systems in order to propose the countermeasures in damage of computer and electronic equipments due to lightning surges. The relationship between the current flow in the down conductor and the current flow in the steel conduit surrounding the down conductor was investigated as a function of the installation method of down conductors. Also the experiments were conducted to evaluate the influences of the skin effect on the down conductor systems. As a result, when the down conductor were bonded to the steel conduit, the down conductor and the steel conduit act as one conductor, so much more lightning current flows in the steel conduit than in the copper down conductor because of the skin effect and choking effect. Therefore to reduce the adverse effects such as the electrostatic induction and side flashes caused by the potential rise of down conductors due to lightning currents, it is extremely effective to bond the down conductor to the steel conduit and steel frame of structures. |