CN102157242A

CN102157242A - Seismic-resistant electrical cable

Info

Publication number: CN102157242A
Application number: CN2011100737141A
Authority: CN
Inventors: 周俊民
Original assignee: JIANGSU TIANDILONG CABLE CO Ltd
Current assignee: JIANGSU TIANDILONG CABLE CO Ltd
Priority date: 2011-03-25
Filing date: 2011-03-25
Publication date: 2011-08-17

Abstract

The invention relates to a seismic-resistant electrical cable comprising a conductor, a semiconductive layer, a conductor shielding layer, an insulating layer, an insulating shielding layer, a copper strip shielding layer, an elastic body packing, a wrapping layer, an isolating sleeve, a thin round steel wire armoring layer, a thick round steel wire armoring layer, a copper conductor, an isolated layer and an outer sheath. The seismic-resistant electrical cable is characterized in that a semiconductive band layer is wrapped outside the conductor; insulating materials, packing materials, isolating sleeve materials and outer sheath materials are all elastic body polymers; and double-layer steel wire armoring is adopted for the armoring layers. The invention has higher shearing rigidity, bending rigidity and damping ratio, obvious effects of shear resistance, bending moment, axial force, torsion, and the like, and excellent seismic-resistant and seismic-proof capacity.

Description

The antidetonation power cable

Technical field

The present invention relates to power cable, be widely used in rated voltage 35kV and the following electric power system, belong to antidetonation, shockproof cable technology field.

Background technology

" arteries "---the electric wire of building as modern industry is indelible to the progradation of society.The radiation mode of electric wire is various, mainly based on built on stilts, poling, direct-burried, crane span structure etc.Along with the continuous progress of society, people extraordinarily pay close attention to urban environment, and the greening urban environment is improved the quality of living, so people have become the overhead transmission line of " day net " formula into the underground piping transmission line, have beautified environment.Because it is frequent that big in recent years small earthquake takes place, destruction in various degree can appear in electric equipments such as electric wire, for example Wenchuan, Sichuan violent earthquake in 2008, the transmission line heavy damage, not only cause economic loss difficult to the appraisal to society, and influence entire society and development and national economy, also had a strong impact on earthquake relief work and earthquake reconstruction work.Therefore, the research and development of carrying out the antidetonation cable for the shock resistance that alleviates earthquake loss, improves transmission line are very important.My company pays close attention to the people's livelihood, adapts to the social development demand, dare to challenge scientific and technological summit, has researched and developed a kind of antidetonation power cable.This cable transmission power is big, coefficient of safety is high, long service life, has antidetonation, shockproof ability especially.

Summary of the invention

The invention provides a kind of antidetonation power cable, this product has under geological process, dissolving internal force (shearing, moment of flexure, axial force, moment of torsion etc.) or distortion performances such as (displacement of the lines, angular displacements) that structure produces, is a kind of cable product with antidetonation, shake-proof ability.

The present invention realizes by following technical proposals: conductor adopts the 2nd kind of copper conductor of GB/T 3956-2008 regulation; The outer wrapped one deck semi-conductive tape of conductor; The outer three-layer co-extruded conductor shield of dry type of semi-conductive tape, insulating barrier, insulation screen; The outer overlapping wrapped one deck copper strips of insulation shielding constitutes metal screen layer; Three metallic shield cores are twisted into cable, and the cable core gap adopts the rubber bar of sulfuration to fill closely knit; The reinforced nonwoven fabrics of the outer wrapped one deck of cable core constitutes lapping layer; Lapping layer extrudes one deck separation sleeve outward; Separation sleeve is provided with double-deck round steel wire armour outward, (steel wire diameter 0.8～2.5mm) armour is interior for thin round steel wire, (steel wire diameter 4.0～6.0mm) armours outside for thick round steel wire, and have four isodiametric copper conductors to divide thick round steel wire armour equally in the cover wire, inside and outside two-layer armour direction of lay is opposite.The outer overlapping wrapped 2 layers of reinforced nonwoven fabrics of armour constitute separator, and separator closely extrudes the elastomer oversheath outward.

The invention has the beneficial effects as follows: antidetonation power cable of the present invention is according to the design of earthquake basic requirements of design, introduces a plurality of seismologic parameters, derives through complicated calculating and selects to conform with the cable material of performance, refining forming.The outer wrapped semi-conductive tape of this cable conductor has played even conductor effect of electric field on the one hand, helps to eliminate the twisting resistance between conductor and the insulation on the other hand; Conductor screen and insulation shielding adopt the semiconductive rubber of cross-linking type, and electrical insulation capability ethylene-propylene rubber is preferably adopted in insulation, and ethylene-propylene rubber increases through mechanical performance after the special processing: tensile strength 〉=14N/mm before aging ², elongation at break 〉=280%, through 96h, after 90 ℃ of burin-in process, tensile strength 〉=12N/mm ², elongation at break 〉=240%, the effect such as anti-shearing, moment of flexure, axial force, moment of torsion that has improved insulated wire cores.The rubber bar of stranding filling and vulcanization has played the effect of damping damping device, and makes the cable each point stressed evenly.Separator adopts polyurethane elastomer material, reduces the modulus of elasticity of cable, and the cross sectional moment of inertia of cable is increased.Adopt 2 layers of wire armoring, internal layer adopts finer wire, make inner compact layer and flexible, the outer thicker wire that adopts has improved cable unit cross section compressive resistance effect, the armour that two-layer direction constitutes on the contrary, have stretching resistance, compressive resistance, anti-shearing, anti-axial force, the distortion of the cable that elimination displacement of the lines, angular displacement bring.Place four copper conductors in the skin, increased the cable fault current capacity, reduced cable eddy current loss to a certain extent.Oversheath adopts polyurethane elastomer, and this material is through after the special processing, and mechanical performance strengthens greatly: tensile strength 〉=17N/mm before aging ², elongation at break 〉=500%, through 48h, after 100 ℃ of burin-in process, tensile strength 〉=16N/mm ², elongation at break 〉=450% has played the effect of damping damping, and shearing rigidity, bending stiffness, the damping ratio of cable are increased greatly, and can sustain the instantaneous acceleration 0.30g(seismic fortification intensity that geological process brings is 8).

Description of drawings

Fig. 1 is a structural representation of the present invention.

Among the figure: 1, conductor, 2, semi-conductive layer, 3, conductor shield, 4, insulating barrier, 5, insulation screen, 6, the copper strips screen, 7, elastomer-filled, 8, lapping layer, 9, separation sleeve, 10, thin round steel wire armour, 11, thick round steel wire armour, 12, copper conductor, 13, separator, 14, oversheath.

Embodiment

Below in conjunction with accompanying drawing and 35kV antidetonation power cable embodiment the present invention is further described.

As shown in the figure: conductor 1 outer wrapped one deck semi-conductive tape 2; The three-layer co-extruded conductor shield 3 of semi-conductive tape 2 outer dry types, insulating barrier 4, insulation screen 5; Insulation shielding 5 outer overlapping wrapped one deck copper strips constitute metal screen layer 6; Three metallic shield cores are twisted into cable, and the cable core gap adopts the rubber bar of sulfuration to fill 7; The reinforced nonwoven fabrics of the outer wrapped one deck of cable core constitutes lapping layer 8; The lapping layer 8 outer one deck separation sleeves 9 that extrude; The separation sleeve 9 outer thin round steel wire of left-hand (steel wire diameter 0.8～2.5mm) armours 10 that are provided with, the thick round steel wire of dextrad is set outside the thin round steel wire armour 10, and (steel wire diameter 4.0～6.0mm) armours 11 have four isodiametric copper conductors 12 to divide thick round steel wire armour 11 equally in the thick round steel wire armour 11.The outer overlapping wrapped two-layer reinforced nonwoven fabrics of armour constitutes separator 13, the separator 13 outer elastomer oversheaths 14 that closely extrude.

Claims

1. antidetonation power cable comprises conductor, semi-conductive layer, conductor shield, insulating barrier, insulation screen, copper strips screen, elastomer-filled, lapping layer, separation sleeve, thin round steel wire armour, thick round steel wire armour, copper conductor, separator, oversheath.

2. it is characterized in that the outer wrapped one deck semi-conductive tape of conductor; Insulating material, packing material, separation sleeve material, jacket material are elastomer polymer; Armour adopts double wire armor.

3. according to right 1 described antidetonation power cable, it is characterized in that wrapped one deck semi-conductive tape on the described conductor.

4. according to right 1 described antidetonation power cable, it is characterized in that described insulating material adopts the second third rubber material, packing material adopts the rubber bar of sulfuration, and separation sleeve, oversheath are polyurethane elastomer material.

5. according to right 1 described antidetonation power cable, it is characterized in that described armour adopts double wire armor, the thin round steel wire armouring of internal layer, outer thick round steel wire armouring.