Why should copper tape be worn outside the high voltage line?
Don't know what you said is not outside the wire to prevent wire wear fracture is the main protective line running time may be affected by wind speed but small swing movement (high voltage line you said insulation outside I really did not understand what is what)
No metal sheathed cables with extruded insulation, the semi conductive shielding layer, but also increase the metal shielding layer is wrapped with copper or copper wire, the metal shielding layer, the capacitance current in normal operation; when the system is short circuited, the short-circuit current channel, at the same time also played the role of the electric field shielding. It is obvious that if the semiconductor layer and the copper shield are not present in the cable, the possibility of insulation breakdown between the core and the core of the three core cable is very high.
The conductor of the cable is twisted by a plurality of wires, and the air gap is easily formed between the conductor and the insulating layer, and the surface of the conductor is not smooth, and the electric field can be concentrated. Also in the contact surface and the insulating sheath may also exist gap is caused by factors of partial discharge, the shielding layer surface of the insulation layer and a layer of semi conductive material, and it was shielding the insulating layer and the metal sheath potential good contact, etc., so as to avoid the partial discharge occurs between the layer and the insulating sheath. This layer of shielding for the outer shielding layer;
