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Main features of overhead cables

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1, high reliability of power supply

The use of aerial cables can greatly reduce all kinds of short-circuit faults (especially flashover faults common to overhead bare conductor). Compared with bare overhead conductors, the failure rate is 4-6 times lower. Overhead cables will not generate water trees in use. After years of running cables, the insulation quality has not dropped significantly.

2, good power supply security

The use of overhead conductor has greatly reduced the number of electric shocks and injuries. The tests and calculations show that even if the live surface of the cable is touched by hand, the induced current is less than 0.1mA (10kV) and 0.2mA (35kV), which is much lower than the 50-100mA death standard specified in the national electrical safety regulations. It can be seen that when the overhead cable is powered on, when the human body or other animals inadvertently touch the cable insulation surface, as long as the cable is not broken down, it will not cause harm to humans and animals.

3, easy erection and maintenance

Overhead cables can be erected on any kind of tower, or they can be erected along the wall. Under special circumstances, they can also be walked through the trees and fixed directly on the tree poles with gold fittings. It can be set up in a single circuit, or multiple lines can be set up on the same pole without requiring a wide “electrical corridor”. In the installation can be erected on the original overhead line, the use of the original cross arm and porcelain bottle, but also can use a full set of matching hardware and accessories. According to the actual situation of the site, the factory can make special or self-made special fittings, so the construction is very convenient. Overhead cables do not need special inspections, and they do not cause short-circuit tripping accidents due to branch flashovers and residents throwing miscellaneous objects, or crane crane mis-collisions, which greatly reduces the maintenance and repair work of the line.

4, economical and reasonable

Although the use of aerial cables is more expensive than using bare overhead conductors, it is cheaper than ordinary underground installations. Therefore, the use of overhead cables, although the one-time investment is slightly higher, but combined with other factors, the operating costs will be significantly lower than the bare overhead wire. If overhead cables are used to reduce the number of corridors, even if multiple lines share a single tower, the cost of land acquisition is reduced. The operation does not need to cut trees under the pruning line, which saves cutting and cutting fees. The most important thing is to reduce the line failures. The resulting direct or indirect loss of costs. Therefore, its overall cost is obviously lower, more economical and more reasonable.