What is the difference electric field distribution characteristics?

First, turnkey (or with insulated) cable

Turnkey (or with insulated) cable is a multi-core low-voltage cable in terms of turnkey type for extruded insulation, insulated with paper insulation for oil.

That is the first turnkey system and better every type insulated stranded wire cores are filled into the cable, and then turnkey metal layer (shield, concentric conductor, metallic sheath or armor), and finally extruded outer sheath is made with insulated after the insulated wire core stranding, the cable core is then wrapped with insulating tape a certain thickness (so that the relative phase between and relatively between the same electric strength), dried and then impregnated extruded lead sheath, and finally extruded outer sheath.

Turnkey type or electric cable with insulated distribution is very uneven, the phase insulation and packing are subject to change at the time of the electric field, both the radial component of the power line, but also a tangential component, it is also called non-radial cable .

Since the tangential component of the field strength generated branches easy to make plastic insulation aging, and the filler is lower than the electric strength of the insulation, so that the electric strength of the entire cable is not high, therefore, turnkey-type structure used for 0.6 / 1kv1.8 / 3kv voltage level PVC insulation, XLPE insulation and EPR (HEPR) insulated power cables. 1KV cables low voltage, small electric field strength, do not ask for electrical insulation properties, in addition to the cable cross-sectional area of light music with external circular turnkey multi-core structure, the larger cross-sectional area of the cable for multi-use sector or multi-core tile structure, such as a three-phase system with three core cable, three-phase four-wire system with a four-core cable, three-phase five-wire system with a five-core cable, in order to save material. 1.8 / 3kv cable must have a metal shield, the main three-core turnkey circular structure.

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Post time: Apr-05-2017
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