安防监控系统摄像头屡遭雷击原因分析与措施

Cause Analysis and Measures of the Camera Struck Repeatedly by Lightning in Security Monitoring System

本文分析了安防监控系统摄像头遭雷击现场范围内的闪电数据资料。结果显示,500 m范围内两年遭雷击时的闪电次数达17次,其中雷电流对应的滚球半径大于距雷击点平均距离的仅有1次;雷电脉冲磁感应强度在LPZ0B区不小于0.07 ×10?4 T的有15次,占总的88.2%,在LPZ1区不小于0.07 ×10?4 T的有6次,占总的35.3%。这说明室内外摄像头,遭受直击雷的可能性较小,大多数情况是遭受感应雷击,是摄像头屡遭雷击的主要原因。这对安防监控系统的防雷具有一定指导作用。

This paper analyzes the lightning data of the security monitoring system in the scope of lightning site. The results show that the frequency of thunderstroke in the two years is up to 17 times at the range of 500 meters. Among them, there is only 1 time that the rolling sphere radius of lightning current is larger than the average distance from the lightning point. There are 15 times that lightning impulse electromagnetic induction intensity in LPZ0B area is not less than 0.07 ×10?4 T, which is 88.2% of the total amount, and there are 6 times that lightning impulse electromagnetic induction intensity in LPZ1 area is not less than 0.07 ×10?4 T, which accounts for 35.3% of the total amount. From the results, it is proved that the indoor and outdoor cameras are unlikely to suffer direct lightning flash strike, and in most cases cameras are subjected to inductive lightning, which is the main reason of the camera repeatedly struck by lightning. Therefore, the study has some guidance to the lightning protection of the security camera monitoring system.