Study on Lightning Strike Risk Evaluation and Protection Scheme of Antennae Array
Hailiang Lu · Gao dianya jishu · 2006
This article presents a method,which can be used to evaluate the risk of lightning strike on equipment information systems,to calculate the stroke-incidence rate under the condition of direct lightning strike,shielding failure and indirect lightning strike for antennae array.The calculation of direct lightning strike directly adopt the method introduced in the 《Design code for protection of structures against lightning》(GB50057-1994).The calculation of shielding failure uses the method integrating the Electro-geometric Model(EGM) and the Alternative Transients Program(ATP) simulation analysis,regarding the outside line of antennas as a ground wire.To evaluate the stroke-incidence rate under the condition of indirect lightning,the inductive voltage should be worked out first.The electromagnetic field produced by return strike of lightning is used to gain the value in this article.The ATP simulation analysis is still used then to get the last stroke-incidence rate.The method has been used for an actual antenna array system to design a three-step protection project,which has worked successfully and has been listed in the article.