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What is an overhead line and what is a cable?
Release time:
2022-03-02
Overhead lines are wires, usually bare conductors, erected in the air through towers and concrete towers. A cable consists of one or more mutually insulated conductors and an outer insulating protective layer, which is used to transmit power or information from one place to another.
Overhead lines are wires, usually bare conductors, erected in the air through towers and concrete towers. A cable consists of one or more mutually insulated conductors and an outer insulating protective layer, which is used to transmit power or information from one place to another.
Comparisons and differences:
Overhead line: non-insulated, exposed metal conductor, installed in air, fixed on tower, air insulated. Main advantage: low cost. The disadvantage is that it takes up a lot of land resources (route corridors) and affects the cityscape of the city.
The use of insulating media to isolate metal conductors from the outside world, laying on the ground or underground. The main advantages are that the attachment is relatively convenient, occupies less land resources, and does not affect the city appearance. The disadvantage is that the cost is too high. From the perspective of safety, due to materials and manufacturing processes in the industry, the safety of overhead lines is very good, and the failure rate is much lower.
What are the parts of the transmission line route?
No one is familiar with transmission lines. In the city steel forest, rural roads, we can often see a lot of transmission towers and poles. In fact, their professional name is overhead power lines. At present, high-voltage transmission lines and rural distribution lines are mostly overhead lines.
Overhead line configuration: wires, insulators, gold tools, towers and their foundations, lightning protection wires and grounding devices, etc.
Wire: Conducted current as an essential part of a circuit.
Insulator: maintain insulation between the three phases when the wire conducts current, and insulate on the ground.
Tower: It is to lay the wires so that there is a certain distance between the ground and its three phases.
Metal fittings: metal accessories that connect wires and insulators, etc., and can be installed on the tower.
Lightning protection line: to prevent the thunder from being directly shot down by the wire.
Grounding device: connect the lightning wire and soil, and introduce brain current into the ground.
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