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使用同轴电缆系统时如何防雷

2016-05-18

     有线电视发展迅速,如何满足人们希望随时都能看到稳定的电视节目,同轴电缆系统防雷成为有线电视工作者比较迫切需要解决的问题,但防雷方法林林总总,需加以总结以供选择使用。
  同轴电缆系统的防雷方法有接地防雷法、眼压防雷洁、隔离防雷洁等。
  接地法就是在每一个放大器或者其他容易遭受雷击的器件单独装设接地线,使雷电产生的能量释放到大地,对器件起保护作用。其要点一是接地电阻尽量小,二是必须和电源接地线分开,否则不起防雷作用。但如果系统较大.需要防雷保护的器件较多且分散的话,在每个器件上都安装良好的接地线,势必引起工程量的增大。

  限压法就是在设备的端口处并按一个限压型防雷器件,使电缆的感应雷电压限制在一定幅度范围之内,从而保护设备,其缺点是防雷器件本身经过放电后,容易失效或烧毁。

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