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Main features and models of overhead insulated conductors commonly used in 10kV distribution lines

1, good insulation performance

Due to the extra insulation layer of the overhead insulated conductor, the superior insulation performance of the bare conductor can reduce the phase distance between the lines, reduce the insulation requirements of the support members of the line, and increase the number of circuits in the line on the same pole.

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2, good corrosion resistance

Since the overhead insulated wire has an insulating layer on the outer layer, it is less oxidized and corroded than the bare wire, and has strong corrosion resistance, which can prolong the service life of the wire.

3, protection against external damage

Reduce the influence of external factors such as trees, flying metal film and dust, and reduce phase-to-phase short circuit and grounding accidents.

4 strength meets the requirements

Although the insulated wire is less steel core, it is tough, so that the mechanical strength of the whole wire can meet the requirements of stress design.

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5, the core of the insulated wire

The overhead insulated wires are aluminum and copper. In the distribution network, the application of aluminum core is relatively large, mainly because the aluminum material is lighter and cheaper, the requirements for the line connecting parts and the supporting parts are low, and the original distribution network is mainly made of steel core aluminum stranded wire. The aluminum core wire is used to facilitate the connection of the original network. In actual use, aluminum core wire is also used. The copper core wire is mainly used as a down conductor for transformers and switchgear.

6. Insulation material for insulated wires

The insulating protective layer of overhead insulated wires is thick insulation (3.4mm) and thin insulation (2.5mm). Thick insulation allows frequent contact with trees during operation, and thin insulation allows only short-term contact with trees. The insulating protective layer is further divided into cross-linked polyethylene and light polyethylene, and the cross-linked polyethylene has better insulation performance.