监控系统防雷设计（Lightning protection design of monitoring system）.docVIP

监控系统防雷设计（Lightning protection design of monitoring system） I. overview Lightning is known to be extremely destructive, with voltages up to millions of volts and instantaneous currents of up to hundreds of thousands of amperes. The destructive effects of lightning strike are reflected in the following three levels: Equipment damage, casualties; Life reduction of equipment or components; The transmission or storage of signals, data (analog or digital) is disturbed or lost, and even make electronic equipment malfunction, and temporary paralysis or the entire system standstill. At present, most of the buildings and facilities in the world are still using the traditional lightning rod lightning protection. The practice of using lightning arrester to prevent direct lightning stroke is proved to be economical and effective. However, with the continuous development of modern electronic technology, the use and interconnection of a large number of precision electronic equipment, lightning protection for these electronic devices is powerless. The lightning rod can not prevent the induced lightning, over-voltage, operation over-voltage, and lightning wave invading the over-voltage, but this kind of over-voltage is the main culprit to destroy a large number of electronic equipment. Every year, many kinds of communication control systems or networks are damaged by lightning. In these cases, the security monitoring system is damaged by lightning, and the failure of automatic monitoring system often happens. In the security monitoring subsystem, some front end cameras are designed for outdoor installation, and the lightning protection system must be designed and installed for lightning prone areas. Two, the design description The system lightning protection scheme includes two aspects: external lightning protection and internal lightning protection: Including the external lightning protection lightning lightning belt, wire and grounding and so on, its main function is to ensure tha