CN204904906U - Middling pressure power cable - Google Patents
Middling pressure power cable Download PDFInfo
- Publication number
- CN204904906U CN204904906U CN201520672546.1U CN201520672546U CN204904906U CN 204904906 U CN204904906 U CN 204904906U CN 201520672546 U CN201520672546 U CN 201520672546U CN 204904906 U CN204904906 U CN 204904906U
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- cable
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- copper strips
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Abstract
The utility model relates to a middling pressure power cable has multicore insulation core, and every core insulation core's conductor from interior to exterior is crowded package internal shield layer, insulating layer, external shielding layer in proper order, and every core insulation core's the outside is around package nanometer semiconduction diamond -like membrane shielding copper strips, and multicore insulation core stranding is cladding lining and oversheath again. Has the advantage of improving the electrical loss of the heat dispersion of cable, the temperature that reduces the conductor and then reduction cable from the angle of cable itself.
Description
Technical field
The utility model relates to a kind of medium-pressure power cable.
Background technology
Medium-pressure power cable is widely used power cable.Conductor in cable becomes the element of a power consumption in electric power system in the course of work of cable because of the resistance of itself, its power consumption becomes heat, is that conductor heats up.And because the D.C. resistance of conductor presents linear positive along with temperature itself, the temperature of conductor is higher, and its power consumption is larger, thus formation vicious circle.The insulating material also power consumption due to dielectric loss, the heating of cable itself, only makes a gesture of measuring very little with the heating of conductor mutually simultaneously.For the insulating material of cable, the temperature of insulating material is made to raise because of conductor temp .-elevating transmission and insulating material self-heating and the rising that causes can cause the heat ageing of insulating material.Therefore the operating temperature ratings of cable according to the long term heat ageing performance provision of insulating material, meanwhile, determines the ampacity of cable according to the radiating condition etc. around the operating temperature ratings of cable and cable.
The ampacity of cable is the key factor determining cable performance driving economy.As the above analysis, for the cable specification that is determined, the ampacity generally improving cable has two methods, the temperature resistant grade namely improving cable insulation material and the radiating condition improved around cable.And the temperature resistant grade improving cable insulation material no doubt can improve the ampacity of cable, but simultaneously due to the rising of conductor temperature, the loss of cable itself also can sharply increase, the operating cost of cable is improved, and the temperature resistant grade of insulating material is necessarily along with the rising of cable cost, thus partial offset improves the benefit that ampacity obtains.And the radiating condition improved around cable, the operation Fang Eryan for cable is also a thing being difficult to realize.
As everyone knows, the transmission of heat has three kinds of modes, i.e. conduction, convection current and radiation.This conduction wherein needs the object of two transferring heats to have mutual contact, and contact area its conduction of velocity larger is faster.Convection current is in fact the medium transferring heat by flowing, and because cable inside is the space of relative closure, air is wherein little, so the contribution that brings of convective heat transfer transmission and limited.Radiation refers to that object outwardly launches the energy (in other words heat) of oneself in the mode of infrared radiation.All material has launches ultrared ability, and it is relevant with the character of material itself that ultrared ability launched by material.Indicate that the index of material transmitting infrared capable is called emissivity, at the same temperature, the material that emissivity is high has stronger IR emission ability.First insulation system due to cable will ensure electric property and the physical and mechanical properties of cable, therefore will improve the heat dispersion of cable, can only the structure beyond cable insulation be taken measures.
Summary of the invention
The purpose of this utility model is for above-mentioned existing problems, provides a kind of angle from cable itself to improve the heat dispersion of cable, reduces the medium-pressure power cable of the electrical loss of the temperature of conductor and then reduction cable.
The purpose of this utility model is achieved in that to have multicore insulated wire cores, the conductor of every core insulation core extrudes internal shield, insulating barrier, outer shielding layer from the inside to the outside successively, the outermost wrapped nanoscale semiconductive diamond-film-like shielding copper strips of every core insulation core, multicore insulated wire cores stranding coated lining and oversheath again.
The utility model, the thickness of the nanoscale semiconductive diamond-film-like of nanoscale semiconductive diamond-film-like shielding copper strips is 50 ~ 250 nanometers, and the thickness of the transition zone of nanoscale semiconductive diamond-film-like is 25 ~ 250 nanometers.
The utility model, the resistivity of nanoscale semiconductive diamond-film-like is less than 500 Ω m, is conducive to the electrical contact between insulation shielding and copper strips, ensure that the equipotential effect of copper strips does not decline.
The utility model, there is following good effect: adopt nanoscale semiconductive diamond-film-like shielding copper strips, the manufacturing cost of cable is not almost affected, but solve common cable and make because of the oxidation of shielding copper strips the problem that its shielding action declines, reduce the power consumption that cable is in operation, make cable in use produce good economic benefit.
The utility model, has the advantage of the electrical loss improving the heat dispersion of cable, the temperature reducing conductor and then reduction cable from the angle of cable itself.
Embodiment is further described the utility model by reference to the accompanying drawings below.
Accompanying drawing explanation
Fig. 1 is the structural representation of an embodiment of the present utility model
In figure, 1, conductor; 2, internal shield; 3, insulating barrier; 4, outer shielding layer; 5, nanoscale semiconductive diamond-film-like shielding copper strips; 6, lining; 7, oversheath.
Embodiment
With reference to Fig. 1, the present embodiment is a kind of medium-pressure power cable, there is multicore insulated wire cores, the conductor 1 of every core insulation core extrudes internal shield 2, insulating barrier 3, outer shielding layer 4 from the inside to the outside successively, the outermost wrapped nanoscale semiconductive diamond-film-like shielding copper strips 5 of every core insulation core, multicore insulated wire cores stranding is coated lining 6 and oversheath 7 again; The thickness of the nanoscale semiconductive diamond-film-like of nanoscale semiconductive diamond-film-like shielding copper strips is 50 ~ 250 nanometers, and the thickness of the transition zone of nanoscale semiconductive diamond-film-like is 25 ~ 250 nanometers; The resistivity of nanoscale semiconductive diamond-film-like is less than 500 Ω m.
The utility model, extrude on the basis of structure not changing cable, adopt the mode with nanoscale semiconductive diamond-film-like shielding copper strips, improve the heat-sinking capability of insulated wire cores, the integral heat sink ability of cable is increased, thus reduces the electric energy loss of cable.
The thermal conductivity 400W/m.k of copper, it is extraordinary heat-conducting metal, but because copper strips is that the mode of putting up with self is wrapped in insulated wire cores, the contact area of itself and insulated wire cores reality much smaller than the surface area of insulated wire cores, thus have impact on the efficiency absorbing heat from insulated wire cores to a certain extent; And the copper strips through measuring cable shield use is within the scope of the cable operating temperature of 30 DEG C ~ 80 DEG C, and its infrared emitting rate only has 0.44 ~ 0.46, its ability of externally being dispelled the heat by transmitting infrared ray is poor.Due to during cable cabling will outside insulated wire cores coated a lot of thermal conductivity very poor, even some is the material that can use as insulation material, therefore cable is by the poor effect of the external heat conduction of copper strips, relies on radiation mode to a great extent and outwards dispels the heat.
It is even higher that the comprehensive thermal conductivity of nanoscale semiconductive diamond-film-like of the present utility model shielding copper strips can reach 800W/m.k, compared with common copper strips, under same contact area, its capacity of heat transmission improves at least one times, is conducive to shielding copper strips and absorbs heat from insulation screen.And nanoscale semiconductive diamond-film-like is within the scope of the cable operating temperature of 30 DEG C ~ 80 DEG C, its infrared emitting rate reaches 0.68 ~ 0.70, has the ability of higher radiations heat energy.Although the passage of its externally heat conduction is the same with common copper strips unimpeded not, but the mode of the heat of self by radiation can more efficiently externally send by nanoscale semiconductive diamond-film-like shielding copper strips, thus improve the efficiency of heat trnasfer, effectively serve to the effect of cable conductor cooling.
Nanoscale semiconductive diamond-film-like shielding copper strips of the present utility model, the thickness of its nanoscale semiconductive diamond-film-like and transition zone thereof is 50 ~ 500 nanometers, and the resistivity of its resistivity and cable insulation semiconductive shielding layer is suitable; The basic demands such as the thickness of its copper strips meet the standard-required of cable, therefore can not affect the function of cable copper strip because copper strip surface adds nanoscale semiconductive diamond-film-like, also substantially can not affect the physical dimension of cable.Because the hardness of diamond-film-like is very large, so, its effect can not be lost because the reasons such as friction cause nanoscale semiconductive diamond-film-like to shield copper strips in the course of processing.Especially the antiseptic property of excellence that has of diamond-film-like, can protect copper strips to produce oxidation, solve conventional power cable makes its function reduction problem because copper strips oxidation.This advantage also can be used for removing the antioxidant added in insulation shielding material to prevent copper strips to be oxidized at present completely, reduces the cost of cable.
Because nanoscale semiconductive diamond-film-like shielding copper strips can give conductor and the insulation cooling of cable efficiently, so compared with common copper strip shielding under same operating current and radiating condition, conductor and insulation have lower temperature thus also just to have lower loss; Under same working temperature, cable can transmit larger electric current.Thus in the use procedure of cable, good economic benefit is produced.
Claims (3)
1. a medium-pressure power cable, there is multicore insulated wire cores, it is characterized in that: the conductor (1) of every core insulation core extrudes internal shield (2), insulating barrier (3), outer shielding layer (4) from the inside to the outside successively, outermost wrapped nanoscale semiconductive diamond-film-like shielding copper strips (5) of every core insulation core, multicore insulated wire cores stranding is coated lining (6) and oversheath (7) again.
2. medium-pressure power cable according to claim 1, it is characterized in that: the thickness of the nanoscale semiconductive diamond-film-like of described nanoscale semiconductive diamond-film-like shielding copper strips is 50 ~ 250 nanometers, and the thickness of the transition zone of nanoscale semiconductive diamond-film-like is 25 ~ 250 nanometers.
3. medium-pressure power cable according to claim 2, is characterized in that: the resistivity of described nanoscale semiconductive diamond-film-like is less than 500 Ω m.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520672546.1U CN204904906U (en) | 2015-08-31 | 2015-08-31 | Middling pressure power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520672546.1U CN204904906U (en) | 2015-08-31 | 2015-08-31 | Middling pressure power cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204904906U true CN204904906U (en) | 2015-12-23 |
Family
ID=54927066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520672546.1U Expired - Fee Related CN204904906U (en) | 2015-08-31 | 2015-08-31 | Middling pressure power cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204904906U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185460A (en) * | 2015-08-31 | 2015-12-23 | 广东吉青电缆实业有限公司 | Medium-voltage power cable |
-
2015
- 2015-08-31 CN CN201520672546.1U patent/CN204904906U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105185460A (en) * | 2015-08-31 | 2015-12-23 | 广东吉青电缆实业有限公司 | Medium-voltage power cable |
| CN105185460B (en) * | 2015-08-31 | 2016-08-31 | 广东吉青电缆实业有限公司 | A kind of medium-pressure power cable |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20151223 Termination date: 20200831 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |