电子系统室外线路引入终端箱处的雷电防护

Lightning Protection of Outside Line Introduced Terminal Box in Electronic System

阐明了电子系统室外线路引入终端箱处的光缆线路、金属线路的性能、损坏原因。对第一类、第二类防雷通过设计计算,分别确定其短路电流有屏蔽层和无屏蔽层时的冲击电流值,以选取适配的电涌保护器。指出电子系统室外线路应采用带有屏蔽层的金属线,并埋地敷设。

This paper expounded the performances and damage causes of fiber cable line and metal line by which outside line of electronic system is imported into terminal box. Through the design calculation of the first class and the second class lightning protection respectively,the impacting current value was determined on the short circuit current with and without shielding layer,to select the adaptive surge protector. It was pointed out that the outside line of electronic system should use the shielding layer metal line and be laid underground.