CN202434258U

CN202434258U - Novel high voltage and ultrahigh voltage crosslinked polyethylene insulated power cable

Info

Publication number: CN202434258U
Application number: CN2012200005745U
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 novel high voltage and ultrahigh voltage crosslinked polyethylene insulated power cable. The novel high voltage and ultrahigh voltage crosslinked polyethylene insulated power cable comprises a conductor, wherein the conductor is wrapped by a semi-conductive band outside to form a semi-conductive wrapped layer. An internal semi-conductive shielding material, an internal non-linear coating material, an insulating material, an external non-linear coating material and an external semi-conductive shielding material are co-extruded out of the semi-conductive wrapped layer to respectively form an internal semi-conductive shielding layer, an internal non-linear coating layer, an insulating layer, an external non-linear coating layer and an external semi-conductive shielding layer. The external semi-conductive shielding layer is wrapped by a buffer layer, a metal shielding layer, an external water retaining buffer layer, a metal sheath layer, an anticorrosive layer, an external protective layer and a semi-conductive coating layer. The novel high voltage and ultrahigh voltage crosslinked polyethylene insulated power cable has the effect of preventing electron emission and shielding, and meanwhile, has the capacity of automatically homogenizing electrical field distribution in a non-uniform electrical field and effectively inhibits local electrical fields on the insulating surface of the cable and the local electrical fields inside from concentrating so as to inhibit formation and development of electrical trees in the high voltage and ultrahigh voltage crosslinked polyethylene insulated power cable, so that the service life of the cable is prolonged and the operational reliability of the cable is ensured.

Description

Novel high-pressure, ultra-high voltage cross-linking polyethylene-insulated power cable

Technical field

The utility model relates to a kind of high-tension electricity transmission cable, relates in particular to a kind of novel high-pressure, 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.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.

Cable long-time running and use experience show; Aging the wearing out with water tree of electric branch is to cause high-tension cable crosslinked polyethylene performance degradation until one of principal element of destroying; Its generation and development mainly receive stress, chemical potential effect, partial discharge function influence; Therefore, the generation of prevention of water tree needs integrated control.Facts have proved; Adopt prior art and measure still can't guarantee to eliminate fully the formation and development of electric branch in high pressure, the crosslinked polyetylene insulated layer of extra-high-tension cable; There is branch discharge in various degree in high pressure, the ultra-high voltage cross-linking polyethylene insulated cable running; Cause its decreasing insulating, the generation of the crosslinked polyetylene insulated layer of the high-tension cable breakdown accident that causes because of the electric branch discharge is arranged in the time of also.Therefore, the formation of the electric branch in the crosslinked polyetylene insulated layer of inhibition high-tension cable is the problem that high pressure, extra-high-tension cable research and development, manufacturing and use department pay close attention to development always.

The utility model content

The utility model is in order to overcome the above problems novel high-pressure, the ultra-high voltage cross-linking polyethylene-insulated power cable that a kind of simple in structure, long service life is provided, has had good inhibition electric branch generative capacity.

The technical scheme of the utility model is: comprise conductor; Wrapped semi-conductive tape forms the semiconductive lapping layer outside conductor, outside the semiconductive lapping layer semiconductive shieldin material in 5 layers of co-extrusion, in non-linear coating material, Insulation Material, outer non-linear coating material, semi-conductive shield outside material form respectively inner semiconductor layer, in non-linear coating layer, insulating barrier, outer non-linear coating layer, out semiconductor layer; Wrapped semiconductive waterstop forms resilient coating outside out semiconductor layer; Outside resilient coating, dredge around the soft copper silk with one heart and form metal screen layer; The wrapped elasticity expanding material resilient coating that blocks water outside forming that vertically blocks water outside metal screen layer, the outer vertically weld metal aluminium strip of water-blocking buffer layer forms metal sheath layer outside, outside metal sheath layer, smears pitch and forms anticorrosive coat; Outside anticorrosive coat, extrude plastic sheath and form outer jacket, outside outer jacket, smear the semiconductive powder and form the semiconductive overlay.

The beneficial effect of the utility model is adsorbable conductor thread core electrons emitted in insulating barrier, plays the effect of anti-electronics emission barrier; Has in inhomogeneous field the ability of homogenizing Electric Field Distribution voluntarily simultaneously; Can effectively suppress the cable insulation surface concentrates with inner internal field; Thereby play inhibition high pressure, crosslinked polyetylene insulated middle electric branch formation of extra-high-tension cable and the effect that develops, reach the useful life of prolongation cable and the purpose of reliability of operation.Power cable long-term work temperature of the present invention can reach 90 ℃; The longest sustainable time is 5 seconds during short circuit; The maximum temperature that cable conductor allows can reach 250 ℃; Useful life is than about 1 times of existing power cable extension, and this power cable is applicable to 750KV and following superhigh pressure, the electric power transfer of high-tension cable.

Description of drawings

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

1 is conductor among the figure, the 2nd, the semiconductive lapping layer, the 3rd, inner semiconductor layer, the 4th, in non-linear coating layer; The 5th, insulating barrier, the 6th, outer non-linear coating layer, the 7th, out semiconductor layer, the 8th, interior vertical water-blocking buffer layer; The 9th, metal screen layer, the 10th, outer vertically water-blocking buffer layer, the 11st, metal sheath layer; The 12nd, anticorrosive coat, the 13rd, outer jacket, the 14th, semiconductive overlay.

Embodiment

Novel high-pressure, ultra-high voltage cross-linking polyethylene-insulated power cable; Comprise conductor 1; Wrapped semi-conductive tape forms semiconductive lapping layer 2 outside conductor 1, outside semiconductive lapping layer 2 semiconductive shieldin material in 5 layers of co-extrusion, in non-linear coating material, Insulation Material, outer non-linear coating material, semi-conductive shield outside material form respectively inner semiconductor layer 3, in non-linear coating layer 4, insulating barrier 5, outer non-linear coating layer 6, out semiconductor layer 7; Vertical water-blocking buffer layer 8 in wrapped semiconductive waterstop forms outside out semiconductor layer 7; Outside interior vertical water-blocking buffer layer 8, dredge around the soft copper silk with one heart and form metal screen layer 9; Outside metal screen layer 9 wrapped elasticity vertically block water expanding material form outside vertical water-blocking buffer layer 10; Vertically water-blocking buffer layer 10 outer vertically weld metal aluminium strips form metal sheath layer 11 outside; Outside metal sheath layer 11, smear pitch and form anticorrosive coat 12, outside anticorrosive coat 12, extrude plastic sheath and form outer jacket 13, outside outer jacket 13, smear the semiconductive powder and form semiconductive overlay 14.

Claims

1. novel high-pressure, ultra-high voltage cross-linking polyethylene-insulated power cable; Comprise conductor; It is characterized in that: wrapped semi-conductive tape forms the semiconductive lapping layer outside conductor, outside the semiconductive lapping layer semiconductive shieldin material in 5 layers of co-extrusion, in non-linear coating material, Insulation Material, outer non-linear coating material, semi-conductive shield outside material form respectively inner semiconductor layer, in non-linear coating layer, insulating barrier, outer non-linear coating layer, out semiconductor layer; Wrapped semiconductive waterstop forms resilient coating outside out semiconductor layer; Outside resilient coating, dredge around the soft copper silk with one heart and form metal screen layer; The wrapped elasticity expanding material resilient coating that blocks water outside forming that vertically blocks water outside metal screen layer, the outer vertically weld metal aluminium strip of water-blocking buffer layer forms metal sheath layer outside, outside metal sheath layer, smears pitch and forms anticorrosive coat; Outside anticorrosive coat, extrude plastic sheath and form outer jacket, outside outer jacket, smear the semiconductive powder and form the semiconductive overlay.