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随着夏天雨季的到来,有线电视网(CATV系统)在雨季中最大的故障源就是雷击。众所周知,雷电是自然现象,雷击释放能量很大,它的放电时间很短,但泄放电流可达几万、甚至几十万安培。因此,直接遭雷击,在放电通道上毁坏性巨大。即使不是直接雷击,而是在落雷点附近的建筑物体,由于电磁感应,在建筑物体上或者在架空线上都会产生高电压冲击波,其感应电压可高达数千伏,甚至上万伏。这种高电压冲击波,沿着建筑物体或沿着导体迅速传播,可破坏各种电器设备,危及人身安全。在CATV系统中,一旦遭到雷击,没有良好防雷措施的系统就会遭到严重破坏,甚至
With the advent of the summer rainy season, the biggest source of trouble for cable networks (CATV systems) during the rainy season is lightning strikes. As we all know, lightning is a natural phenomenon, lightning discharge energy is very large, its discharge time is very short, but the discharge current up to tens of thousands, or even hundreds of thousands of amperes. Therefore, direct lightning strikes are extremely devastating in the discharge channel. Even if it is not a direct lightning strike, but a building object near the lightning strike point, a high voltage shock wave is generated on the building object or overhead line due to electromagnetic induction, and the induced voltage can be as high as several thousand volts or even tens of thousands volts. Such high-voltage shock waves spread rapidly along buildings or along conductors, destroying various electrical equipment and endangering personal safety. In CATV systems, systems without good lightning protection can be severely damaged in the event of a lightning strike, and even