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High voltage cable with shielding effect

Information Source:Henan Huadong Cable Co., Ltd  Release date:2014-01-08    In the power cable structure of so-called "shield", is in essence a kind of improving the distribution of the electric field measures. Cable conductor by multiple wire twisted and become, it and insulating layer formed between easy air gap, conductor surface not smooth, can cause electric field concentration. In the conductor surface add a layer of half of conductive materials shielding layer.
    it and be shielded conductor equipotential and insulating layer good contact, so as to avoid the conductor and insulating layer happened between partial discharge, this layer shielding as internal shielding layer;
   Also in insulation surface and sheath at the contact point may also exist clearance, is a cause of partial discharge factors, so in the insulating layer surface add a layer of half of conductive materials shielding layer, it and be shielded insulating layer with good contact, and metal jacket and potential, so as to avoid the insulating layer and sheath happened between partial discharge, this a layer of shielding for outer shield; No metal jacket, crowded insulated cable, in addition to half conductive shielding layer outside, also increase with copper strip or wire wrapped metal shielding layer, the metal shield effect, in normal operation, through the capacitive current; When the system short-circuit, as short circuit current channel, also have the effect of electric field shield. Visible,
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