CN202434259U

CN202434259U - 750kV ultra high voltage crosslinked polyethylene insulating power cable

Info

Publication number: CN202434259U
Application number: CN2012200005800U
Authority: CN
Inventors: 姚恒斌; 何新刚; 何正寅; 乔磊
Original assignee: Yangzhou Shuguang Cable Co Ltd
Current assignee: Yangzhou Shuguang Cable Co Ltd
Priority date: 2012-01-04
Filing date: 2012-01-04
Publication date: 2012-09-12
Anticipated expiration: 2022-01-04

Abstract

The utility model relates to a 750kV ultra high voltage crosslinked polyethylene insulating power cable. The 750kV ultra high voltage crosslinked polyethylene insulating power cable comprises a conductor which is wrapped by a semi-conductive band to form a semi-conductive wrapping layer. A semi-conductive inner shielding material, an insulating material and a semi-conductive outer shielding material are coextruded out of the semi-conductive wrapping layer to form a conductor shielding layer, an insulating layer and an insulating shielding layer. The insulating shielding layer is wrapped by a vertical water-retaining buffer layer, a radial water-retaining aluminum sheath layer, a pitch anticorrosive layer, a non-metal outer jacket layer and a semi-conductive coating. The 750kV ultra high voltage crosslinked polyethylene insulating power cable is reasonable in structure, and meanwhile, the insulating material with high dielectric property and the ultra-clean smooth semi-conductive shielding material with a specific addictive are used so as to improve the cable breakdown field strength, so that various defects of the 750kV ultra high voltage crosslinked polyethylene insulating power cable are reduced to the lowest state. With the vertical water-retaining buffer layer and the radial water-retaining aluminum sheath layer, humidity and water can be fundamentally prevented from entering the insulating layer from a cable sheath so as to prevent generation of water tree in cable insulation.

Description

750kV ultra-high voltage cross-linking polyethylene-insulated power cable

Technical field

The utility model relates to a kind of power transmission cable, relates in particular to a kind of 750kV ultra-high voltage cross-linking polyethylene-insulated power cable.

Background technology

Along with the progress and the expanding economy of society, human increasingly high to the degree of dependence of electric energy, increasing to the demand of electric energy.But most countries all exists the problem of primary energy and productivity skewness weighing apparatus in the world, therefore, builds the great attention that big capacity, remote electrical network have obtained national governments.For reducing the line loss in the long distance power transmission process, need to adopt the high voltage power transmission technology.China is just at develop actively superhigh pressure, special ehv power transmission circuit; Be accompanied by the development of EHV transmission technology; Important component part-power cable to electrical network has proposed increasingly high requirement; Must hold out against the test of high pressure, superhigh pressure; Since twisted polyethylene cable have good electric property, transmission capacity big (the long-term work temperature can reach 90 ℃), in light weight, can high drop or advantages such as vertical run, installation and maintenance be convenient, it constantly increases at high pressure, extra-high-tension cable field portion, and the trend that replaces other type cable is gradually arranged.At present, 220kV and following electric pressure high-tension cable mainly adopt crosslinked polyetylene insulatedly in the world, and 500kV, 750kV level cross-linked polyethylene insulated cable also are applied in the supertension line.Therefore, the research and development of 750kV extra-high-tension cable, manufacturing and use have become the problem that scientific research department and enterprise pay close attention to.

The utility model content

The utility model provides a kind of functional, long service life, the wide 750kV ultra-high voltage cross-linking polyethylene-insulated power cable in adaptation field in order to overcome the above problems.

The technical scheme of the utility model is: comprise conductor; The outer wrapped semi-conductive tape of described conductor constitutes the semiconductive lapping layer; The outer three-layer co-extruded semiconductive inner shield material of semiconductive lapping layer, Insulation Material, semiconductive external shield material form conductor shield, insulating barrier, insulation screen; Wrapped semiconductive waterstop forms vertical water-blocking buffer layer outside insulation screen; Vertical weldering corrugated aluminum sheath structure forms the aluminium sheath layer that radially blocks water outside vertical water-blocking buffer layer 6; Outside the aluminium sheath layer 7 that radially blocks water, smear pitch and form the pitch anticorrosive coat, outside the pitch anticorrosive coat, extrude plastic sheath and form nonmetal outer jacket, outside nonmetal outer jacket, smear the semiconductive powder and form semiconducting coating.

The utility model is rational in infrastructure; Easy to manufacture; The main processes such as three-layer co-extruded mode, the elimination of online prestressing force, argon arc welding welding that adopt adopt the insulating material and the special smooth semiconductive shieldin material of the ultra-clean that is added with specialist additive of high dielectric property simultaneously, thereby improve the cable breakdown field intensity; Make the various defectives of the utility model drop to minimum state; Be provided with vertical water-blocking buffer layer and the aluminium sheath layer that radially blocks water, this just fundamentally isolated moisture and moisture get into insulation from cable cover(ing), to prevent the generation of water tree in the cable insulation.

Description of drawings

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

1 is conductor among the figure, the 2nd, and semiconductive lapping layer, the 3rd, conductor shield, the 4th, insulating barrier, the 5th, insulation screen, the 6th, vertical water-blocking buffer layer, the 7th, the aluminium sheath layer that radially blocks water, the 8th, pitch anticorrosive coat, the 9th, nonmetal outer jacket, the 10th, semiconducting coating.

Embodiment

750kV ultra-high voltage cross-linking polyethylene-insulated power cable; Comprise conductor 1; Described conductor 1 outer wrapped semi-conductive tape constitutes semiconductive lapping layer 2; Semiconductive lapping layer 2 outer three-layer co-extruded semiconductive inner shield material, Insulation Material, semiconductive external shield material form conductor shield 3, insulating barrier 4, insulation screen 5; Wrapped semiconductive waterstop forms vertical water-blocking buffer layer 6 outside insulation screen 5, and vertical weldering corrugated aluminum sheath structure forms the aluminium sheath layer 7 that radially blocks water outside vertical water-blocking buffer layer 6, outside the aluminium sheath layer 7 that radially blocks water, smears pitch and forms pitch anticorrosive coat 8; Outside pitch anticorrosive coat 8, extrude plastic sheath and form nonmetal outer jacket 9, outside nonmetal outer jacket 9, smear the semiconductive powder and form semiconducting coating 10.

Claims

1.750kV ultra-high voltage cross-linking polyethylene-insulated power cable; Comprise conductor; It is characterized in that: the outer wrapped semi-conductive tape of described conductor constitutes the semiconductive lapping layer; The outer three-layer co-extruded semiconductive inner shield material of semiconductive lapping layer, Insulation Material, semiconductive external shield material form conductor shield, insulating barrier, insulation screen; Wrapped semiconductive waterstop forms vertical water-blocking buffer layer outside insulation screen, and vertical weldering corrugated aluminum sheath structure forms the aluminium sheath layer that radially blocks water outside vertical water-blocking buffer layer, outside the aluminium sheath layer that radially blocks water, smears pitch and forms the pitch anticorrosive coat; Outside the pitch anticorrosive coat, extrude plastic sheath and form nonmetal outer jacket, outside nonmetal outer jacket, smear the semiconductive powder and form semiconducting coating.