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What is an overhead line and what is a cable? Basic analysis of overhead power lines!

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What is an overhead line and what is a cable? Basic analysis of overhead power lines!

作者: Release Date: 2018-07-21 Author: Click:

What are overhead lines and cables?

Overhead lines refer to the conductors erected in the air through iron towers and cement pole towers, and are generally bare conductors.

A cable is made up of one or more insulated conductors and an outer insulation maintenance layer, a wire that transmits power or information from one place to another. Comparison and difference between the two:

Overhead lines: uninsulated, exposed metal conductors are erected in the air to be fixed on iron towers and insulated with air. Secondary advantage: low cost. The disadvantage is that it occupies more land resources (line corridors) and affects the city appearance. : Insulation medium is used to isolate the metal conductor from the outside, and it is laid in the air or underground. The secondary advantage is that it is more convenient to lay and occupies less land resources, which does not affect the urban appearance. The disadvantage is that the cost is too high. As far as safety is concerned, the current industry believes that due to data and manufacturing processes, the safety of overhead lines is superior, and its fault rate is far lower.

Overhead lines

1 What parts of a power line route?


Everyone must be familiar with power transmission lines. In urban steel forests and on rural avenues, we often see many transmission towers and utility poles. In fact, their professional name is overhead power lines. At present, overhead lines are mostly used for high-voltage transmission and rural distribution lines.


Overhead line composition: wires, insulators, fittings, towers and their roots, lightning conductors and grounding installations.

Wire: Conducting current, it is the fundamental part of the line.

Insulators: When conducting current, the wires must be insulated from each other and the ground.

Pole tower: It is used to erect wires so that there is a certain interval between the wires and their three phases.

Metal fittings: metal accessories that connect wires and insulators and install them on pole towers.

Lightning conductors: Avoid indirect lightning strikes on the wires.

Grounding installation: Connect the lightning conductor and the soil to lead the lightning current to the world.


PS: Actually, in addition to the overhead power lines we can see everyday, there are many underground cables. Cables have a small footprint, reliable power transmission, and strong anti-interference ability, but it is difficult for ordinary people to see them.


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Keywords: overhead line

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