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Effect of high voltage cable and shielding

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-03-11

The so-called "shield" in cable structure, is essentially a kind of measures to improve the distribution of electric field. Cable conductor consists of a plurality of wires twisted together, the air gap formed between it and the insulating layer, the conductor surface is not smooth, will cause the electric field concentration. The shielding layer with a layer of semi conductive material the surface of conductor, and it was shielded conductors and insulating layer potential and good contact, thus avoiding the partial discharge occurring between the conductor and the insulating layer, this layer of shielding for the inner shielding layer; also can be in contact surface gap insulation and jacket, is factors causing partial discharge, the shielding layer insulation layer on the surface of a layer of semi conductive material, and it was shielded insulation has good contact, potential and metal jacket, thereby avoiding the partial discharge occurs between the layer and the sheath insulation, this layer of shielding for the external shielding layer; no metal sheath cables with extruded insulation, in addition to semi conductive shielding layer, but also increase the metal shielding layer is wrapped with copper or copper, the metal shielding layer, the capacitance current in normal operation; when a short circuit fault occurs, as the short circuit current channel, at the same time also played the role of shielding electric field. Visible, if does not exist in this layer and semiconductor layer and the copper shield cable between the core and the core, three core cable insulation breakdown in the possibility of very large.

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