How are the types and roles of wire and cable shields?

I. Wire and cable shielding layer of the type and role is how? The shielding layer of wire and cable is not the same as the effectiveness of the materials used and the structure is not the same. Shield layer according to the effectiveness of wire shielding, insulation shielding and metal shielding. 1, wire shielding. Wire shielding for the package to the cable wire outside the name of the semi-conductive material, used to prevent corona discharge caused by more than 3kv of high-voltage cable. Due to the high voltage and strong electrostatic field so that the angle is not large multi-core stranded name, resulting in electrostatic induction corona discharge, jeopardizing the insulation function, resulting in kinetic energy loss. In each phase of the multi-core stranded business outsourcing wire shielding, expanding the angle of the wire, proportional to the electrostatic field, to prevent corona discharge caused by the wire shielding is also known as uniform clamps. Requirements for the conductor shielding layer for the name of moisturizing, no significant convex lines, oblique angle and particles. Conductor shielding semi-conductive materials used in the insulation material is mixed with conductive chemicals, there are conductive ability. Conductor shielding materials are paper insulated cable line of semi-conductive paper, metalized paper, etc., vulcanized rubber, plastic insulated cable line of semi-conductive vulcanized rubber, semi-conductive plastic, etc. 2, insulation shielding. Insulation shielding is wrapped to the insulation and grounding device copper core cable outside the semi-conductive material, when a phase of insulation damage, the main copper core cable through the insulation shielding and grounding device copper core cable, resulting in a single-phase grounding common fault, so that the single-phase grounding maintenance posture disconnect the switching power supply, not only to prevent a major two-color short-circuit failure caused by the common fault, but also to prevent short-circuit failure electric lone caused by the coalbed methane, mining dust Incineration and explosion. Therefore, the cable with insulation shielding is especially good for the power supply system to the machines and equipments in the place where there is the risk of incineration and explosion. The insulation shielding is made of the same materials as the wire shielding. No metal sheath of plastic, rubber cable line, insulation shielding by semi-conductive materials and metal tape or wire composition. 3, metal shielding. Metal shielding is wrapped to the package insulation outside the conductive material, resulting in electromagnetic induction shielding to prevent strong electrostatic field radiation sources troublesome communication data signals. Therefore, the rated current of 3kV above the cable should have metal shielding. According to the material is not the same as copper foil shielding and copper wire shielding two kinds. The first type is used for mobile cables, and the second type is used for mobile cables. The use of lead and aluminum metal jacket, metal jacket can also be used as a metal shield. When the cable is used, the metal shield should be connected to the grounding device management system.

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