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Lightning Protection Of Transmission Line
Mar 14, 2017

For analog systems, its line is mainly transmitted signal and power cables. Outdoor camera power supplies can be introduced from the terminal or can be introduced from the prison near the point of the power supply. Control signal transmission lines and the alarm signal transmission line is generally used to strengthen core shielded cord, erecting (or laying) between the front end and Terminal, which strengthen the core and shield at both ends should be well grounded.

As a rule, transmission line in suburban areas, village laying, laying mode can be used. When when the condition is not allowed, use the communication pipe, or overhead. From the perspective of mine, buried way mine works best, overhead power lines are most vulnerable to lightning strikes and devastating, spreading wide to avoid end-end equipment, overhead line transmission should be on every Pole on the earthing, cable hanging wire and metal piping in cable lines should be grounded. Intermediate amplifier input signal source and the power supply should access suitable arrester, respectively.

But is in need of attention, buried transmission lines do not prevent lightning strikes occur, a large number of facts, of burying ground wire cable fault caused by lightning is about 30% per cent of total failure, even if the place is far from lightning strikes, there will still be some lightning currents into the cable. Therefore, if the shielding layer of cables or cables through steel pipes buried, we need to pay attention to maintain the electrical connection of the pipe, which is very effective for protection of electromagnetic interference and electromagnetic induction, this is mainly due to the metal tube shielding effect and the skin effects of lightning current. Of course, if the cables all wear metal tube with difficulty, cable entry terminal and headend equipment wear metal pipe buried before the introduction, but underground not less than 15 m in length, at-home-end cable metal skin, steel pipe connected to lightning protection grounding devices.