Kiloamp Technology - The Global Provider of Electronic Security Protection
Kiloamp 2018-10-31 442
We know that with the continuous development of the economy and the rapid improvement of people's living standards, the role of lightning arresters in the industry is becoming more and more significant. Next, what are the relevant contents of the factors that damage the cable line of the lightning arrester due to lightning strikes?
The fiber is non-conductive and protected from inrush current. However, in order to protect high-capacity optical fibers from environmental events, optical cables must have armored components, mainly metal armor layers, reinforcing cores, and service copper wires, all of which are metal conductors. When the power line is close to a short circuit or lightning strikes a metal component, it will induce an alternating current or surge current, which may damage personal safety or damage the line equipment.
Lightning has the tendency to find the minimum path of impedance to vent the thundercloud charge and neutralize the subsurface charge. When a lightning strikes a nearby earth or building, the potential of the lightning strike point rises, and the cable extends far, and the far end potential can be regarded as 0, so the cable potential near the lightning strike point is also considered to be zero.
The lightning arrester of the signal lightning arrester forms a great potential difference between the lightning cable and the optical cable. If the potential difference exceeds the compressive strength between the Jiang Lei point and the outer sheath of the optical cable, the outer protective layer will be broken and the lightning loss point will be formed. The arc channel to the metal member causes a large amount of lightning current to flow to the cable, causing serious damage to the cable.
The lightning strike point of the optical cable is 800m away from the relay station, and there are two lightning strike points at a distance of 20m. The damage situation is basically the same, the cable sheath and the sheath are burned, and the optical fibers are all blown. The nut that fixes the reinforcing core and the metal sheath in the terminal box is partially melted, the coating layer of the optical fiber is completely burned, the core is exposed, and six of the cores have been blown. It is analyzed that the lightning is introduced into the soil through trees or other means, and the metal sheath and the reinforcing core are introduced from the damaged point of the outer sheath of the cable.
The reason why the cable line of the power surge protector is vulnerable to lightning strikes:
A metal sheath, reinforcing core or copper wire is insulated from the ground to the lower cable.
A region with abrupt changes in topography and a large change in soil resistivity.
When the cable is not enough for a single tree or a tall building.
In short, we have detailed explanations on the factors that are damaged by lightning strikes on the cable line of the lightning arrester. We must give full play to our subjective initiative and continuously promote the development of the industry.
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