CN201174271Y - Super high voltage crosslinked cable - Google Patents

Abstract

The utility model discloses an extrahigh voltage crosslinked cable, wherein a semiconductive nylon belt is wound outside a conductor of the cable; the insulation of the cable adopts a three-layer extrusion structure; internal insulation is of a conductor screen layer, while intermediate insulation is of crosslinked polyethylene and external insulation is of an insulation shielding layer; a waterproof layer outside the insulation consists of a radial waterproof layer and a longitudinal waterproof layer; the longitudinal waterproof layer is formed by winding a semi-conducting water-resistant tape and a water-resistant buffering tape in an overlapped way; the radial waterproof layer is of a welded corrugated aluminum sheath which is coated with a bitumen anti-corrosive layer outside; and a layer of thin polyethylene is coated on an inner sheath, while antiflaming polyvinyl chloride is coated in the middle and a bitumen anti-corrosive layer is coated outside the sheath. The extrahigh voltage crosslinked cable has the advantages of high operating temperature, excellent electrical properties, large transmission capacity, portable structure, convenient installation and laying, no fall limitation, simple maintenance and particularly, no hidden danger of a fire caused by oil leakage; moreover, the cable is mainly used in a high-fall extrahigh voltage lead wire in a large capacity power station, and can also be used as a crossing-river transmission conducting wire; therefore, the cable has wide application and better social benefits and economic benefits.

Description

Ultra-high voltage cross-linking cable

Technical field

The utility model relates to a kind of power cable structure, particularly ultra-high voltage cross-linking cable.Belong to the cable new technical field.

Background technology

Along with the develop rapidly of China's power industry, as electric power carry artery and blood vessel---the demand of power cable also grows with each passing day.In the power cable of various insulation forms, crosslinked polyethylene (XLPE) insulated power cable is one and shows up prominently, flourish new army, in the development course of power cable, though the polyvinyl chloride power cable is simple with its technology manufacturing, stable performance, lay conveniently, be not subjected to the advantages such as restriction of high low head, but because of its intrinsic shortcoming such as dielectric loss big (tg δ=8), working temperature low (65 ℃), high inadequately all the defective of voltage withstand class reveals gradually, and this just makes power cable with cross-linked polyethylene insulation progressively substitute the polyvinyl chloride insulation power cable becomes inundant inexorable trend.In addition, power cable with cross-linked polyethylene insulation electric property and heat resistance are superior, connect and convenient transportation, have progressively replaced the power cable of oil-impregnated paper insulation, polyvinyl chloride insulation structure at present.But because the extra-high-tension cable outer jacket usually needs to apply pitch and graphite etc., cause dust, and be unfavorable for construction, difficult in maintenance etc., therefore, power cable with cross-linked polyethylene insulation need improve protective coverings of cable, improves the combination property of cable.

The utility model content

Technical problem to be solved in the utility model is to overcome the defective that current ultra-high voltage cross-linking cable sheath exists, a kind of superior electrical property, good flame retardation effect, working temperature height are provided, transmission capacity is big, structure is light, install and to lay conveniently, to safeguard simple, does not especially apply the power cable of pitch and graphite.

The purpose of this utility model is achieved in that a kind of ultra-high voltage cross-linking cable, comprise cable core, watertight composition and restrictive coating from the inside to the outside respectively, conductor in the middle of described cable core comprises, the semiconductive nylon tape of conductive surface and outside insulating barrier, watertight composition and restrictive coating are wrapped successively outside cable core, it is characterized in that: the restrictive coating of described cable is a three-decker, is respectively polyethylene layer, flame-proof polyvinyl chloride layer and semiconductive material oversheath from the inside to the outside.

Insulating barrier adopts three layers and extrudes structure, and the interior insulation of conductive surface is a conductor shield, and middle is that crosslinked polyethylene, external insulation are insulation screen.

Above-mentioned watertight composition has three layers, be respectively from the inside to the outside the semiconductive waterstop, partly lead block water buffer strip and the welding corrugated aluminium sheath.

The utility model is rational in infrastructure simple, and the manufacturing is easy, cost is low.Cable has solved the dust problem in production and the work progress fully, is convenient to the monitoring and the maintenance of cable.Have stronger electrical property, fire resistance and water resistance in addition; Construction of cable compactness, rounding, performance requirement that fully can the 500kV ultra-high voltage cross-linking cable.Be mainly used in big capacity power station high drop superhigh pressure lead-out wire, also can be used for crossing over the transfer wire of rivers, purposes is more extensive.

Description of drawings

Fig. 1 is a structural representation of the present utility model.

Among the figure: 1, conductor 2, semiconductive nylon tape 3, interior conductive shield 4, XLPE insulation 5, outer conductive shield 6, partly lead waterstop 7, partly lead buffer water-blocking band 8, welding corrugated aluminium sheath 9, pitch anticorrosive coat 10, PE oversheath 11, flame-proof PVC 12, semiconductive material

Embodiment

As shown in Figure 1, surperficial wrapped semiconductive nylon tape 2 at copper stranded conductor 1, conductive shielding layer 3, XLPE insulation 4, outer conductive shielding layer 5 constitute cable core in squeezing, the outside is provided with three layers of watertight composition, three layers of watertight composition is respectively semiconductive waterstop 6 from inside to outside, partly leads block water buffer strip 7 and welding corrugated aluminium sheath 8, between watertight composition and restrictive coating, apply pitch anticorrosive coat 9, squeeze PE inner sheath 10, flame-proof PVC sheath 11, squeeze one deck semiconductive material 12 at last and obtain finished product.

Claims (3)

1, a kind of ultra-high voltage cross-linking cable, comprise cable core, watertight composition and restrictive coating from the inside to the outside respectively, conductor in the middle of described cable core comprises, the semiconductive nylon tape of conductive surface and outside insulating barrier, watertight composition and restrictive coating are wrapped successively outside cable core, it is characterized in that: the restrictive coating of described cable is a three-decker, is respectively polyethylene layer, flame-proof polyvinyl chloride layer and semiconductive material oversheath from the inside to the outside.

2, ultra-high voltage cross-linking cable according to claim 1 is characterized in that: described watertight composition has three layers, be respectively from the inside to the outside the semiconductive waterstop, partly lead block water buffer strip and the welding corrugated aluminium sheath.

3, ultra-high voltage cross-linking cable according to claim 1 and 2 is characterized in that: described insulating barrier adopts three layers and extrudes structure, and the interior insulation of conductive surface is a conductor shield, and middle is that crosslinked polyethylene, external insulation are insulation screen.