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Why are the high-voltage overhead lines mostly un-insulated bare conductors?

Bare conductors refers to products with only conductors and no insulating layers, including various metals such as copper and aluminum and composite metal round single wires, twisted wires, flexible wiring, profiles and profiles for overhead transmission lines of various structures.

Bare wires are the most basic category of products in wire and cable products. Some of the bare wires can be used as conductive wires for wires and cables; the other part is used as a component in motors, electrical appliances, transformers and other equipment. In addition, bare wires can be used directly in power, communications, transportation, and other sectors to transmit power and information. Bare wires should have good electrical and physical mechanical properties.

Bare wires have only conductors without insulating and sheath structures.

Bare wires can be divided into materials: bare copper conductor, all aluminum conductor(AAC), all aluminum alloy Conductor (AAAC), ACSR and CCA ect. According to the shape structure can be divided into: round single wire, bare stranded wire, soft wiring rain and type line.

Low voltage insulation protection. The high voltage will not penetrate the insulation and it is bare.First, the cost of packaged plastics will increase a lot, which is not conducive to practical applications;

The second is the use of plastics. The weight of the wires will greatly increase, causing an unnecessary burden on the power transmission and increasing the pressure on the wires.

The third is that the voltage of the high-voltage line is very high, which can reach several hundred kilovolts. Such a high-voltage line is not close enough because it can generate an arc discharge that breaks down the air between the high-voltage lines (although the air is also an insulator, but It will also conduct electricity under high pressure). Even if they do not touch each other, they can still cause harm to people when people are close to it. People often get electric shocks, so they usually hang them on high poles with high telephone poles so that they cannot be approached.

The power sector specifies the safety distance that must be maintained for high-voltage live lines of different voltage levels. There has been enough safe distance between the wires, and the ground, not necessary. General high-voltage lines are in the air more than 10 meters, so it is safe. The use of air, a natural insulating material, provides good insulation between "wires and wires" and "wires and grounds."

Fourth, insulation is not conducive to heat dissipation.