Low-energy-consumption light middle-high voltage power cable

Abstract

The utility model relates to a low-energy-consumption light-weight middle-high voltage power cable, which comprises a plurality of power line cores and an outer sleeve, the power line cores are sleeved with the outer sleeve, each power line core comprises a conductor, a graphene inner shielding layer, a crosslinked polyethylene insulating layer and a graphene outer shielding layer from inside to outside, and the conductor is a hollow copper pipe conductor; the current-carrying capacity of the hollow copper pipe conductor can reach 1.5-3 times of that of a solid copper conductor of a traditional middle-high voltage power cable, so that the weight of the length cable can be reduced; the graphene inner shielding layer and the graphene outer shielding layer of the power line core play a role in uniformly insulating an inner surface electric field of a traditional medium-high pressure cable, and the graphene inner shielding layer can also effectively exchange surface heat generated in a conductor loading process through graphene with a high heat conductivity coefficient. The graphene outer shielding layer can effectively and further exchange heat generated by the insulating layer in the alternating current loading process through graphene with a high heat conductivity coefficient, and the heat dissipation effect can be effectively improved.

Description

Technical Field

[0001] The present application relates to the technical field of power cables, and particularly to a low-energy consumption lightweight medium and high voltage power cable. Background Art

[0002] A power cable is a cable used for transmitting and distributing electric energy. It is commonly used in urban underground power grids, outgoing lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of cables is gradually increasing. A power cable is a cable product used to transmit and distribute high-power electric energy in the main lines of a power system.

[0003] Currently, when domestic existing medium and high voltage power transmission and distribution cables operate at full load under ambient temperature, the insulation temperature can reach above 90°C, with a fast temperature rise, causing insulation aging and a sharp decrease in insulation resistance, thus easily resulting in short circuit and blasting phenomena. Moreover, due to completely relying on heat conduction of materials and heat convection in the space environment, the heat dissipation is poor, leading to a continuous increase in the AC resistance of the cable and extremely high comprehensive power transmission losses in the line. Summary of the Utility Model

[0004] Based on this, it is necessary to provide a low-energy consumption lightweight medium and high voltage power cable, which includes a plurality of power cores and an outer sleeve surrounding the plurality of power cores. Each power core includes a conductor, a graphene inner shielding layer, a cross-linked polyethylene insulation layer, and a graphene outer shielding layer from the inside to the outside, and the conductor is a hollow copper tube conductor.

[0005] There is a gap between the plurality of power cores.

[0006] A copper tape shielding layer is sleeved on the outer surface of the graphene outer shielding layer.

[0007] The outer sleeve includes an electrical copper tape, a corrugated aluminum sleeve, and a sheath from the inside to the outside.

[0008] There is a gap between the power core and the electrical copper tape.

[0009] The density of the graphene heat dissipation coating used for the graphene inner shielding layer and the graphene outer shielding layer is 0.003 g / cm 3 .

[0010] Compared with the prior art, the advantages of the present utility model are as follows:

[0011] A low - energy - consumption lightweight medium - and - high - voltage power cable provided by the utility model has a hollow copper tube conductor. Under the same conductor cross - section, due to the skin effect and heat dissipation factors in the AC environment, the current - carrying capacity of the hollow copper tube conductor can reach 1.5 to 3 times that of the solid copper conductor of traditional medium - and - high - voltage power cables. When meeting the fixed load, the designed cross - section of the cable can be reduced by at least 35% or more, and the weight of the long cable can be reduced. In addition to the function of evenly insulating the inner surface electric field of traditional medium - and - high - voltage cables, the graphene inner shielding layer of the power cable core can effectively exchange the surface heat generated during the conductor load process through the graphene with high thermal conductivity. The graphene outer shielding layer can effectively further exchange the heat generated in the insulating layer during the AC load process through the graphene with high thermal conductivity. Graphene has good electrical conductivity and strong heat dissipation, which can effectively improve the heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0013] Figure 1 It is a schematic cross - sectional structure diagram of the low - energy - consumption lightweight medium - and - high - voltage power cable of the embodiment of the present application.

[0014] DESCRIPTION OF THE REFERENCE NUMERALS:

[0015] 1. Conductor; 2. Graphene inner shielding layer; 3. Cross - linked polyethylene insulating layer; 4. Graphene outer shielding layer; 5. Copper tape shielding layer; 6. Electrician copper tape; 7. Corrugated aluminum sheath; 8. Sheath. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] In order to make the above - mentioned objects, features, and advantages of the present application more obvious and understandable, the following will give a detailed description of the specific embodiments of the present application with reference to the drawings. Many specific details are set forth in the following description in order to fully understand the present application. However, the present application can be implemented in many other ways different from those described herein. Those skilled in the art can make similar improvements without departing from the connotation of the present application. Therefore, the present application is not limited by the specific embodiments disclosed below.

[0017] In the description of the present application, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the present application.

[0018] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0019] In the present application, unless otherwise clearly specified and limited, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0020] In the present application, unless otherwise clearly specified and limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0021] It should be noted that when an element is referred to as "fixed to" or "disposed on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this article are only for the purpose of illustration and do not represent the only implementation.

[0022] A low-energy consumption light-type medium and high-voltage power cable includes a plurality of power cores and an outer sleeve surrounding the plurality of power cores. The plurality of power cores can be high-voltage power cores, medium-voltage power cores, or a plurality of medium and high-voltage hybrid power cores with both medium and high voltages. The power core includes a conductor 1, a graphene inner shielding layer 2, a cross-linked polyethylene insulating layer 3, and a graphene outer shielding layer 4 from the inside to the outside. The conductor 1 is a hollow copper tube conductor.

[0023] For this low-energy consumption light-type medium and high-voltage power cable, its conductor 1 is a hollow copper tube conductor 1. Under the same cross-section of the conductor 1, due to the skin effect and heat dissipation factors in the AC environment, the current-carrying capacity of the hollow copper tube conductor 1 can reach 1.5 to 3 times that of the solid copper conductor 1 of the traditional medium and high-voltage power cable. When meeting the fixed load, the designed cross-section of the cable can be reduced by at least 35% or more, and the weight of the long cable can be reduced. In addition to the function of evenly insulating the inner surface electric field of the traditional medium and high-voltage cable, the graphene inner shielding layer 2 of the power core can effectively exchange the surface heat generated during the load process of the conductor 1 through the graphene with high thermal conductivity. The graphene outer shielding layer 4 can effectively exchange the heat generated by the insulating layer during the AC load process through the graphene with high thermal conductivity. Graphene has good electrical conductivity and strong heat dissipation, which can effectively improve the heat dissipation effect.

[0024] In this utility model, for the graphene inner shielding layer 2, the graphene heat dissipation coating is dip-coated on the surface of the hollow copper tube conductor 1 by means of dip-coating process. For the graphene outer shielding layer 4, the graphene heat dissipation coating is cold-sprayed on the cross-linked polyethylene polymer organic insulation surface by means of spraying process. The graphene heat dissipation coating is used for both the inner and outer shielding, and its thermal conductivity can reach 5300 W / m·K. It is suitable for being coated on the surface of radiators such as metals or polymer materials by coating methods such as spraying, brushing, and dip-coating to improve the heat dissipation effect. The heat dissipation principle of this material is that after the nearby heat is transferred to the graphene, it can stimulate the vibration of the graphene lattice, thereby converting the heat into far-infrared rays. Due to the optimization and upgrade of the cable structure and the application of high-conductivity heat dissipation materials, the heat dissipation modes of the conductor 1 and the insulation are advanced from the traditional heat conduction to the heat convection + heat radiation modes. When using the graphene heat dissipation coating as the inner and outer insulation shields, the maximum temperature of the insulation layer during the cable's load operation will not exceed 50°C, which is greatly reduced compared to the temperature of the insulation layer of traditional medium- and high-voltage power cables during load operation being above 90°C. Through the verification of the thermal aging acceleration test, the service life of such medium- and high-voltage power cables can reach 50 years and above, which is much higher than the 30 years of traditional medium- and high-voltage power cables.

[0025] In this utility model, there are gaps between multiple power line cores.

[0026] In this utility model, a copper tape shielding layer 5 is sleeved on the outer surface of the graphene outer shielding layer 4 to shield the electric field, and the heat generated by the copper tape is less.

[0027] In this utility model, the outer sheath includes an electrician's copper tape 6, a corrugated aluminum sheath 7, and a sheath 8 from the inside to the outside. Among them, there is a gap between the electrician's copper tape 6 and the power line cores, and there are also gaps between multiple power line cores, which can enhance the heat dissipation of the conductor 1 and the insulation during the cable operation.

[0028] In this utility model, the density of the graphene heat dissipation coating used for the graphene inner shielding layer 2 and the graphene outer shielding layer 4 is 0.003 g / cm 3， which is much lower than that of the traditional cross-linked polyethylene inner and outer shielding materials, which is 0.92 - 1.14 g / cm 3 . Through the application of relevant lightweight materials and the optimized design of the cable structure, under the same electric energy transmission power, the weight of the cable per unit length can be reduced by more than 15%.

[0029] The above-described embodiments only represent several implementation manners of this application. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent application. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several deformations and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application patent should be subject to the appended claims.

Claims

1. A low-energy consumption light-type medium and high-voltage power cable, characterized in that, It includes a plurality of power line cores and an outer sheath sleeving the plurality of power line cores. The power line core includes, from the inside to the outside, a conductor, a graphene inner shielding layer, a cross-linked polyethylene insulating layer, and a graphene outer shielding layer, and the conductor is a hollow copper tube conductor.

2. The low-energy consumption light-type medium and high-voltage power cable according to claim 1, characterized in that, There is a gap between the plurality of power line cores.

3. A low-energy consumption light-type medium and high-voltage power cable according to claim 1, characterized in that, A copper tape shielding layer is sleeved on the outer surface of the graphene outer shielding layer.

4. A low-energy consumption light-type medium and high-voltage power cable according to claim 1, characterized in that, The outer sheath includes, from the inside to the outside, an electrical copper tape, a corrugated aluminum sheath, and a sheath.

5. A low-energy consumption light-type medium and high-voltage power cable according to claim 4, characterized in that, There is a gap between the power line core and the electrical copper tape.

6. A low-energy consumption light medium and high voltage power cable according to claim 1, characterized in that, The density of the graphene heat dissipation coating used for the inner graphene shielding layer and the outer graphene shielding layer is 0.003 g / cm 3 .

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