CN103198893A - Novel high-voltage and ultra-high-voltage cross-linked polyethylene insulated power cable - Google Patents

Abstract

The invention relates to a novel high-voltage and ultra-high-voltage cross-linked polyethylene insulated power cable. The novel high-voltage and ultra-high-voltage cross-linked polyethylene insulated power cable comprises a conductor, a semi-conductive tape wraps the conductor to form a semi-conductive wrapping layer, inner semi-conductive shielding material, inner nonlinear cladding material, insulating material, outer nonlinear cladding material and outer semi-conductive shielding material are jointly squeezed outside the semi-conductive wrapping layer to respectively form an inner semi-conductive shielding layer, an inner nonlinear cladding layer, an insulating layer, an outer nonlinear cladding layer and an outer semi-conductive shielding layer, and a buffer layer, a metal shielding layer, an outer waterproof buffer layer, a metal sheath layer, an anticorrosive layer, an outer protective layer and a semi-conductive coating layer wraps the outer semi-conductive shielding layer. The novel high-voltage and ultra-high-voltage cross-linked polyethylene insulated power cable has a function of an electron emission resistance protective screen, meanwhile, has the capacity of self-homogenizing electric field distribution in an inhomogeneous electric field, can effectively restrain local electric field concentration of the insulating surface and the interior of the cable, thus has the effect of restraining formation and development of electric trees in the novel high-voltage and ultra-high-voltage cross-linked polyethylene insulated cable and achieves the purposes of prolonging service life and promoting operational reliability of the cable.

Description

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

Technical field

The present invention relates to a kind of high-tension electricity transmission cable, relate in particular to a kind of novel high-pressure, ultra-high voltage cross-linking polyethylene-insulated power cable.

Background technology

Along with progress and the expanding economy of society, human more and more higher 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 more and more higher 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 are subjected to stress effect, chemical potential effect, partial discharge function influence, therefore, the prevention of water tree produces and 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.

Summary of the invention

The present invention 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.

Technical scheme of the present invention is: comprise conductor, wrapped semi-conductive tape forms the semiconductive lapping layer outside conductor, and semiconductive shieldin material, interior non-linear coating material, Insulation Material, outer non-linear coating material, semi-conductive shield outside material form inner semiconductor layer, interior non-linear coating layer, insulating barrier, outer non-linear coating layer, out semiconductor layer respectively in 5 layers of co-extrusion outside the semiconductive lapping 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, smear pitch and form 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 invention has the beneficial effects as follows the electronics that adsorbable conductor thread core is launched in the insulating barrier, play the effect of anti-electronics emission barrier; Has in inhomogeneous field the ability of homogenizing Electric Field Distribution voluntarily simultaneously, the internal field that can effectively suppress cable insulation surface and inside concentrates, thereby play inhibition high pressure, the 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 structural representation of the present invention.

1 is conductor among the figure, the 2nd, and semiconductive lapping layer, the 3rd, inner semiconductor layer, the 4th, interior 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, and semiconductive shieldin material, interior non-linear coating material, Insulation Material, outer non-linear coating material, semi-conductive shield outside material form inner semiconductor layer 3, interior non-linear coating layer 4, insulating barrier 5, outer non-linear coating layer 6, out semiconductor layer 7 respectively in 5 layers of co-extrusion outside semiconductive lapping layer 2; 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)

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, and semiconductive shieldin material, interior non-linear coating material, Insulation Material, outer non-linear coating material, semi-conductive shield outside material form inner semiconductor layer, interior non-linear coating layer, insulating barrier, outer non-linear coating layer, out semiconductor layer respectively in 5 layers of co-extrusion outside the semiconductive lapping 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, smear pitch and form anticorrosive coat, outside anticorrosive coat, extrude plastic sheath and form outer jacket, outside outer jacket, smear the semiconductive powder and form the semiconductive overlay.

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