音频配线架保安单元的防雷应用

Discussion about the protection of audio distribution frame

音频配线架作为交换机与用户线之间的连接设备,除了用于对传输线路的配线、调线、参数测量外,主要还担纲着对传输线路的过电压过电流保护(具体工作由配线架中的保安单元完成)。文章在阐述了通信系统对过电压、过电流防护原则的前提下,分析了保安单元的工作原理及组成,对由气体放电管、金属压敏电阻和抑制二极管组成的三级保护做了详细介绍,并就保安单元在电力通信系统中的防雷应用,以及如何防止工频电流经电缆屏蔽层侵入机房造成配线架高电压危害,进行了分析。

The audio distributing frame is regarded as the connection equipment between the exchanger and user lines, besides using for distributing the transmission line, adjusting the line and parameter measurement, it takes on an important task of protection when overvoltage or overcurrent pass through the transmission line. The article explains the protection principle of communication system about overvoltage and overcurrent, analyses operation elements and the structure of this protection unit, introduces the three levels protection which was made up of gas discharge tube, metal pressure-quick resistance and suppressing diode in detail, this safety unit also can be applied to anti-lightening in power communication system. At last it is analyzed how to prevent the cable shielding layer of computer lab from invading by power line current to lead high voltage to damage the distributing frame.