CN204834150U - Heat dissipation type middling pressure power cable - Google Patents
Heat dissipation type middling pressure power cable Download PDFInfo
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- CN204834150U CN204834150U CN201520672630.3U CN201520672630U CN204834150U CN 204834150 U CN204834150 U CN 204834150U CN 201520672630 U CN201520672630 U CN 201520672630U CN 204834150 U CN204834150 U CN 204834150U
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Abstract
The utility model relates to a heat dissipation type 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 aluminum alloy area, 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 heat radiating type 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 heat radiating type 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 aluminum alloy strip 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 aluminum alloy strip 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 aluminum alloy strip, ensure that the equipotential effect of aluminum alloy strip does not decline.
The utility model, there is following good effect: adopt nanoscale semiconductive diamond-film-like shielding aluminum alloy strip, 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 aluminum alloy strip; 6, lining; 7, oversheath.
Embodiment
With reference to Fig. 1, the present embodiment is a kind of heat radiating type 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 aluminum alloy strip 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 aluminum alloy strip 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 aluminum alloy strip, 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 is extraordinary heat-conducting metal, and the utility model uses the thermal conductivity 180W/m.k of aluminium alloy.The specific heat capacity of copper is 390J/kg. DEG C, and the utility model uses the specific heat capacity of aluminium alloy to be 890J/kg. DEG C.The heat energy power of depositing of unit volume of copper is 3471J/cm
3. DEG C, it is 2376J/cm that the utility model uses the unit bodies of aluminium alloy to accumulate heat energy power
3. DEG C.Only from thermal conductivity analysis, the heat conduction advantage of copper is much larger than aluminium alloy, but affecting heat transfer rate also has an even more important factor: the temperature difference.The knowledge of a common-sense is two objects that the temperature difference is larger, and the speed of its heat exchange is faster.Under this special environment of power cable, due to when 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 thermal conductivity only represents metallic shield absorbs heat speed (not considering the impact of the temperature difference) from insulation screen, cooling-down effect as whole cable be the more important thing is and relied on the ability of metallic shield to its external structure transferring heat, i.e. the heat-sinking capability of material.Therefore the metal screen layer of cable uses copper strips or nanoscale semiconductive diamond-film-like shielding aluminum alloy strip is more conducive to cable dissipate heat to need Integrated comparative various factors to judge.
From aforesaid data, the heat energy power of depositing of unit volume of copper is 3471J/cm
3. DEG C, it is 2376J/cm that the utility model uses the unit bodies of aluminium alloy to accumulate heat energy power
3. DEG C.Although this means that the thermal conductivity of aluminium alloy is lower than copper, but the heat that its reduction by 1 DEG C of needs distribute only has 2/3rds of copper, that is in the on all four situation of radiating condition outside the temperature and cabling structure of insulation screen, nanoscale semiconductive diamond-film-like shielding aluminum alloy strip and insulation screen have the larger temperature difference, more easily make heat conduction to nanoscale semiconductive diamond-film-like shielding aluminum alloy strip, thus have higher radiating efficiency.
Simultaneously because copper strips is that the mode of putting up with self is wrapped in insulated wire cores, its contact area with insulated wire cores reality much smaller than the surface area of insulated wire cores, thus have impact on the efficiency from insulated wire cores absorption heat 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.
And the comprehensive thermal conductivity of nanoscale semiconductive diamond-film-like of the present utility model shielding aluminum alloy strip can to reach 800W/m.k even higher, 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, the infrared emitting rate of aluminium alloy and copper roughly the same, so nanoscale semiconductive diamond-film-like aluminum alloy strip 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 aluminum alloy strip, thus improve the efficiency of heat trnasfer, effectively serve to the effect of cable conductor cooling.
The nanoscale semiconductive diamond-film-like shielding aluminum alloy strip that the utility model uses, 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; Although because the thickness of the reason aluminum alloy strip of electrical property will be a bit larger tham copper strips, the physical dimension of cable also substantially can not be affected.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 aluminum alloy strip 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 aluminum alloy strip 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 electrical 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 heat radiating type 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 aluminum alloy strip (5) of every core insulation core, multicore insulated wire cores stranding is coated lining (6) and oversheath (7) again.
2. heat radiating type 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 aluminum alloy strip is 50 ~ 250 nanometers, and the thickness of the transition zone of nanoscale semiconductive diamond-film-like is 25 ~ 250 nanometers.
3. heat radiating type 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 |
|---|---|---|---|
| CN201520672630.3U CN204834150U (en) | 2015-08-31 | 2015-08-31 | Heat dissipation type middling pressure power cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201520672630.3U CN204834150U (en) | 2015-08-31 | 2015-08-31 | Heat dissipation type middling pressure power cable |
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| Publication Number | Publication Date |
|---|---|
| CN204834150U true CN204834150U (en) | 2015-12-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201520672630.3U Expired - Fee Related CN204834150U (en) | 2015-08-31 | 2015-08-31 | Heat dissipation type middling pressure power cable |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513671A (en) * | 2016-01-14 | 2016-04-20 | 薛爱芳 | Nanometer film composite aluminum alloy belt |
| CN105957623A (en) * | 2016-03-14 | 2016-09-21 | 安徽华通电缆集团有限公司 | Super soft solar energy photovoltaic cable with resistance to high and low temperature and acid and alkali corrosion |
| CN106601362A (en) * | 2016-12-09 | 2017-04-26 | 晋源电气集团股份有限公司 | Large-current-carrying high-heat-dissipation multicore power cable |
| CN106683759A (en) * | 2016-12-09 | 2017-05-17 | 晋源电气集团股份有限公司 | High heat-dissipation anti-magnetic shielding power transmission cable |
| CN108766659A (en) * | 2018-06-08 | 2018-11-06 | 徐州乐泰机电科技有限公司 | A kind of heat radiating type cable |
| CN110473660A (en) * | 2019-08-09 | 2019-11-19 | 中辰电缆股份有限公司 | Pressure heat dissipation cable, cable heat sink material and preparation method thereof in one kind |
-
2015
- 2015-08-31 CN CN201520672630.3U patent/CN204834150U/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105513671A (en) * | 2016-01-14 | 2016-04-20 | 薛爱芳 | Nanometer film composite aluminum alloy belt |
| CN105957623A (en) * | 2016-03-14 | 2016-09-21 | 安徽华通电缆集团有限公司 | Super soft solar energy photovoltaic cable with resistance to high and low temperature and acid and alkali corrosion |
| CN106601362A (en) * | 2016-12-09 | 2017-04-26 | 晋源电气集团股份有限公司 | Large-current-carrying high-heat-dissipation multicore power cable |
| CN106683759A (en) * | 2016-12-09 | 2017-05-17 | 晋源电气集团股份有限公司 | High heat-dissipation anti-magnetic shielding power transmission cable |
| CN108766659A (en) * | 2018-06-08 | 2018-11-06 | 徐州乐泰机电科技有限公司 | A kind of heat radiating type cable |
| CN110473660A (en) * | 2019-08-09 | 2019-11-19 | 中辰电缆股份有限公司 | Pressure heat dissipation cable, cable heat sink material and preparation method thereof in one kind |
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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: 20151202 Termination date: 20200831 |
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| CF01 | Termination of patent right due to non-payment of annual fee |