WO2017052119A1 - Manchon de compression de conducteur et système de câble d'alimentation en courant continu à ultra-haute tension l'utilisant - Google Patents

Manchon de compression de conducteur et système de câble d'alimentation en courant continu à ultra-haute tension l'utilisant Download PDF

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Publication number
WO2017052119A1
WO2017052119A1 PCT/KR2016/010114 KR2016010114W WO2017052119A1 WO 2017052119 A1 WO2017052119 A1 WO 2017052119A1 KR 2016010114 W KR2016010114 W KR 2016010114W WO 2017052119 A1 WO2017052119 A1 WO 2017052119A1
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Prior art keywords
layer
conductor
insulating layer
power cable
insulating
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PCT/KR2016/010114
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English (en)
Korean (ko)
Inventor
채병하
이수길
윤현성
Original Assignee
엘에스전선 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020160109852A external-priority patent/KR102594700B1/ko
Application filed by 엘에스전선 주식회사 filed Critical 엘에스전선 주식회사
Publication of WO2017052119A1 publication Critical patent/WO2017052119A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B5/00—Non-insulated conductors or conductive bodies characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/02—Disposition of insulation
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B9/00—Power cables

Definitions

  • the present invention relates to a conductor crimp sleeve and an ultrahigh voltage direct current power cable system using the same.
  • An ultra-high voltage direct current power cable system is a system for transmitting power by using conductors inside a power cable, and is a junction box connecting the ends of the power cable to each other, or the power cable and overhead line. Termination boxes for connecting the terminals may be used.
  • a conductor crimp sleeve for connecting the conductors of the power cable to each other is provided in the intermediate junction box.
  • a tensile strength of more than a certain level is required for the conductor connection portion of the power cable connected by the crimp sleeve.
  • the surface of the crimping sleeve is trimmed to a certain thickness.
  • the cross-sectional area of the crimping sleeve is reduced, so the tensile strength is reduced.
  • the outer diameter of the crimping sleeve can be enlarged to increase the cross-sectional area.
  • the method of simply expanding the outer diameter of the crimping sleeve increases the thickness of the reinforcing insulation layer of the intermediate junction box, thereby increasing the overall size of the intermediate junction. There is this.
  • the present invention maintains the size of the intermediate junction box and improves the tensile strength, and furthermore, it is possible to reduce local heat generation at the end of the conductor.
  • An object of the present invention is to provide a conductor crimp sleeve and an ultra high voltage DC power cable system using the same.
  • a conductor crimp sleeve is a conductor for electrically connecting the conductors of a pair of ultra-high voltage DC power cables including a conductor inner semiconducting layer, an insulating layer, and an outer semiconducting layer to each other.
  • the conductor crimping sleeve is formed of a hollow body having a conductor accommodating portion for accommodating the conductor therein, and at least one crease formed between at least two creases formed to protrude from an outer surface and the creases.
  • the reinforcement portion may be formed integrally with the body portion ⁇
  • both ends of the reinforcement portion may be formed spaced apart in the longitudinal direction from both ends of the body portion.
  • the reinforcing portion may be formed on the inner surface of the conductor pressing sleeve, and both ends of the reinforcing portion may be formed so as to be formed at the position where the corrugation of the conductor pressing sleeve is formed.
  • the conductor pressing sleeve may be formed of copper or aluminum.
  • the ultra-high voltage DC power cable system according to an embodiment of the present invention, a pair of power cables including a conductor, an inner semiconducting layer, an insulating layer, an outer semiconducting layer, and an intermediate junction box for electrically connecting the power cables to each other.
  • the insulation layer of the power cable surrounding the inner semiconducting layer, the insulation layer made of kraft paper impregnated in insulating oil; A second insulating layer surrounding the first insulating layer and made of a composite insulating paper impregnated with insulating oil; And a third insulating layer surrounding the second insulating layer and made of kraft paper impregnated with insulating oil, wherein the intermediate junction electrically connects the conductors of the pair of power cables to each other and protrudes from an inner surface thereof.
  • a conductor pressing sleeve including a body portion having at least two wrinkles formed and at least one wrinkled bone formed between the wrinkles; And innermost layer of kraft paper and composite insulating paper And a reinforcing insulating layer having an outermost layer and surrounding at least a portion of the conductor, the conductor pressing sleeve, and the insulating layer of the power cable, wherein the conductor pressing sleeve has a minimum thickness of the corrugated bone at both ends of the body portion. It may include a conductor crimp sleeve characterized in that the thicker.
  • the conductor of the power cable is a flat conductor having a circular cross-section of one or more layers consisting of a circular center element and a flat element wire stranded so as to surround the circular center element line and having a circular cross section as a whole.
  • the thickness difference between the minimum thickness of the corrugated bone and both ends of the body portion may be equal to or greater than the thickness of the outermost layer of the flat wire layer.
  • the outermost surface of the conductor crimp sleeve may be located closer to the central axis of the power cable than the outermost surface of the first insulating layer of the power cable.
  • the innermost layer of the reinforcing insulating layer may include kraft paper wound between both ends of the conductor crimp sleeve and the insulating layer of the power cable.
  • the innermost layer of the reinforcing insulating layer may further include kraft paper surrounding the outermost surface of the conductor crimp sleeve.
  • the innermost layer of the reinforcing insulating layer may be disposed at the same distance from the outermost surface of the innermost layer of the first insulating layer and the central axis of the power cable.
  • the outermost layer of the reinforcing insulating layer may be formed above the outer diameter of the insulating layer of the power cable.
  • an intermediate layer of composite insulating paper may be further provided between the innermost layer and the outermost layer of the reinforcing insulating layer.
  • a first intermediate layer made of composite insulating paper and a second intermediate layer made of kraft paper may be further provided between the innermost layer and the outermost layer of the reinforcing insulating layer.
  • the first intermediate layer and the second intermediate layer provided between the innermost layer and the outermost layer of the reinforcing insulating layer are respectively formed from the central axis of the second insulating layer and the third insulating layer of the power cable and the power cable. May be placed at the same distance.
  • a pair of power cables including a conductor, an inner semiconducting layer, an insulating layer, an outer semiconducting layer, and an intermediate box for electrically connecting the power cables to each other
  • the ultra-high voltage DC power cable system including the intermediate junction may be connected to the conductors of the pair of power cables by pressing the crimping of the conductor crimp sleeve and trim the outer surface of the conductor.
  • the tensioning force of the conductor connecting portion can be maintained without increasing the outer diameter of the conductor crimping sleeve and the intermediate junction box. Furthermore, it is possible to reduce local heat generation that may occur in the conductor connecting portion by increasing a passage through which the current flows through the intermediate connecting portion.
  • FIG. 1 is a perspective view showing an internal configuration of a power cable.
  • 2 is a cross-sectional view showing the configuration of an ultra-high voltage DC power cable system according to an embodiment of the present invention.
  • 3 to 7 are graphs showing electric field distribution according to positions in an ultra-high voltage direct current power cable system having reinforcing insulation layers having different internal configurations.
  • 8 and 9 are cross-sectional views illustrating electric field distribution of an ultra-high voltage direct current power cable system having a reinforcing insulation layer having different internal configurations.
  • 10 is a side view showing the configuration of a conventional conductor crimp sleeve.
  • 11 is a schematic diagram showing the allowable tension by the conventional conductor crimp sleeve.
  • FIG. 12 is a schematic diagram showing a current movement path by a conventional conductor crimp sleeve.
  • 13 is a side view showing the configuration of the conductor pressing sleeve according to an embodiment of the present invention.
  • 14 is a schematic diagram showing the allowable tension by the conductor crimp sleeve according to an embodiment of the present invention.
  • 15 is a schematic diagram illustrating a current movement path by a conductor crimp sleeve according to an embodiment of the present invention.
  • 16 is a side view illustrating a conductor connection state according to another embodiment of the present invention.
  • FIG. 1 is a partially cutaway perspective view illustrating an internal configuration of an ultra high voltage DC power cable 200.
  • the power cable 200 includes a conductor 210, an inner semiconducting layer 212, an insulating layer 214, and an outer semiconducting layer 216, along the conductor 210 in the cable length direction. It is provided with a cable core portion which transmits electric power only and prevents leakage of current in the radial direction of the cable.
  • the conductor 210 serves as a passage through which current flows to transmit power, and has a high conductivity and a strength and flexibility suitable for cable manufacturing and use, such as copper or aluminum, to minimize power loss. Can be made. As shown in FIG.
  • the conductor 210 includes a flat element wire layer 210C including a circular center element wire 210A and a flat element wire 210B stranded to surround the circular center element wire 210A. It may be a flat conductor having a circular cross section, and as another example, it may be a circular compressed conductor compressed in a circular shape by twisting a plurality of circular wires.
  • the flat conductor has an advantage of reducing the outer diameter of the cable due to a relatively high drop ratio compared to the circular compression conductor.
  • the conductor 210 is formed by a plurality of strands are stranded so that the surface is not smooth The electric field may be nonuniform, and partial corona discharge is likely to occur.
  • an inner semiconducting layer 212 may be formed outside the conductor 210.
  • the inner semiconducting layer 212 may have semiconductivity by adding conductive particles such as carbon black, carbon nanotubes, carbon nanoplates, and graphite to an insulating material.
  • the inner semiconducting layer 212 prevents a sudden electric field change between the conductor 210 and the insulating layer 214 to be described later to function to stabilize the insulating performance.
  • the insulating layer 214 is provided outside the inner semiconducting layer 212 to electrically insulate the outside from the current flowing along the conductor 210 so as not to leak to the outside.
  • the insulating layer 214 may be formed of insulating paper impregnated with insulating oil. That is, the insulating layer 214 may be formed by winding insulating paper in multiple layers so as to surround the inner semiconducting layer 212, and then impregnating the insulating oil after the cable core part is formed.
  • the insulating oil is absorbed into the insulating paper, and the insulating property of the insulating layer 214 may be improved.
  • the insulating oil is filled in the voids in the insulating paper and the gap between the layers formed by winding the insulating paper to improve the insulating property, and to reduce the frictional force between the insulating paper when the cable is bent, thereby improving the bending property of the cable.
  • the type of the insulating oil is not particularly limited, the insulating oil should not be oxidized by heat in contact with the copper or aluminum constituting the conductor 210, and the impregnation temperature may be easily impregnated with the insulating paper, for example, i.
  • the insulating oil may be one or more insulating oils selected from the group consisting of naphthenic insulating oils, polystyrene insulating oils, mineral oils, alkyl benzene or polybutene synthetic oils, heavy alkates, and the like.
  • the insulating paper may be kraft paper (Kraf t paper) from which the organic electrolyte is removed from the kraft paper (Kraf t pul p) as a raw material, or a composite insulating paper in which kraft paper is adhered to one or both sides of a plastic film.
  • the plastic film has a higher resistivity than kraft paper adhered to one or both surfaces thereof, so that even if bubbles are generated in the kraft paper according to the flow of insulating oil during impregnation process or cable operation, the voltage shared in the bubbles can be alleviated.
  • the insulating layer 214 may be formed by winding only kraft and impregnating the insulating oil.
  • the insulating oil flows in the cable load direction, and voids may occur.
  • the thermoplastic resin such as the polypropylene resin is not impregnated with the insulating oil, and the impregnation silver at the time of cable manufacture or operation at the time of cable operation Thermal expansion occurs depending on the temperature.
  • the thermoplastic resin is thermally expanded, the surface pressure is applied to the laminated kraft paper, thereby narrowing the flow path of the insulating oil, thereby reducing the flow of the insulating oil flow due to gravity or contraction / expansion of the insulating oil according to temperature.
  • the composite insulating paper has a higher insulation strength than kraft paper has the advantage of reducing the cable outer diameter.
  • the power cable when the power cable is energized, heat is generated in the conductor that serves as a passage through which current flows, and the silver is gradually lowered from the inner side to the outer side in the radial direction of the cable, thereby causing a temperature difference in the insulating layer 214. do. Therefore, the insulating oil of the insulating layer belonging to the upper section of the conductor, that is, the insulating layer formed on the inner semiconducting layer 212 has a low viscosity.
  • Thermal expansion is performed to move outwards, and when the cable temperature falls, the viscosity of the transferred insulating oil becomes high and does not return to the original state, so that voids may occur in the insulating layer portion immediately above the conductor.
  • a high electric field acts on the insulating layer formed in the direction of the outer semiconducting layer 216, which is an insulating layer belonging to a section directly below the metal sheath, in which the electric field is gradually reversed according to the difference in silver.
  • the upper section of the conductor and the lower section of the metal sheath may have a high possibility of voids, and may act as a weak part of insulation, which is a starting point of partial discharge, insulation breakdown, etc.
  • the insulating paper in the region including the weak insulation of the insulating layer 214. That is, the insulating layer 214 is divided into a first insulating layer, a second insulating layer, and a third insulating layer in the direction of the outer semiconducting layer 216, which will be described later, from the inner semiconducting layer 212.
  • only kraft may be used for the third insulating layer, and the composite insulating paper may be used for the second insulating layer.
  • a difference in resistivity occurs between the second insulating layer on which the composite insulating paper is wound and the first insulating layer and / or the third insulating layer on which the kraft paper is wound, and the low-resistance of the insulating layer 214 on which the kraft paper is wound
  • the 1 insulation layer and / or the 3 insulation layer have a relatively low resistivity, and act to alleviate an electric field shared in the weak insulation portion. Specifically, a high electric field acts on the second insulating layer on which the composite insulating paper having high resistivity is wound due to the resistive electric field distribution characteristic of the DC cable in which the electric field is distributed according to the resistivity, and on the first insulating layer and / or the crab 3 insulating layer.
  • the insulating layer 214 may form a thicker third insulating layer than the first insulating layer.
  • the metal sheath 220 which will be described later, is formed on the outside of the insulating layer 214, or when the cable core part is connected to two power cables sequentially exposed from the inside, and then the metal sheath 220 is restored.
  • the second insulating layer may be formed to have a thickness greater than that of the first insulating layer to form the plastic film of the second insulating layer. It is desirable to protect from heat. In this case, the thickness of the first insulating layer may be selected in consideration of the implied surge voltage required for the power cable.
  • An outer semiconducting layer 216 may be provided outside the insulating layer 214. The outer semiconducting layer 216 is formed of a material having semiconductivity by adding conductive particles, such as carbon black, carbon nanotubes, carbon nanoplates, graphite, etc., to an insulating material like the inner semiconducting layer.
  • the outer semiconducting layer 216 smoothes the surface of the insulating layer 214 in the cable to alleviate electric field concentration, thereby preventing corona discharge, and also physically protects the insulating layer 214. Can be.
  • the outer semiconducting layer 216 may further include a metallized paper.
  • the metallized paper may be formed by laminating an aluminum thin film on kraft paper, and a plurality of perforations may exist to facilitate the impregnation of the insulating layer 214.
  • the cable core part may further include a moisture absorbing part (not shown) to prevent moisture from penetrating into the cable.
  • the moisture absorbing portion may be formed between the stranded wires of the conductor 210 and / or outside of the conductor 210, and has a high speed of absorbing moisture penetrating into the cable and excellent ability to maintain the absorption state. It is configured in the form of powder, tape, coating layer or film containing a super absorbent polymer (SAP), and serves to prevent moisture from penetrating in the longitudinal direction of the cable. In addition, the moisture absorbing portion may have a semiconductivity to prevent a sudden electric field change.
  • a cable protection part is provided outside the cable core part, and the power cable laid on the sea floor may further include a cable outer part.
  • the cable protector includes a metal sheath 220 and a polymer sheath 222 to protect the cable from accidental current, external force or other external environmental factors.
  • the metal sheath 220 may be formed to surround the core part.
  • the power cable when installed in an environment such as a seabed, it may be formed to seal the cable core portion to prevent foreign substances such as moisture from entering the cable core portion, and melted outside the cable core portion.
  • By extruding the metal to form a seamless outer surface can be excellent in ordering performance.
  • Lead or aluminum is used as the metal, and in the case of a power cable installed on the sea floor, lead having excellent corrosion resistance against seawater is used. It is preferable to use, and it is more preferable to use the lead alloy with the addition of a metal element to complement the mechanical properties.
  • the metal sheath 220 is grounded at the end of the power cable to serve as a passage through which an accident current flows in case of an accident such as a ground fault or a short circuit, to protect the cable from external shocks, and to prevent the electric field from being discharged to the outside of the cable. Can be.
  • the metal sheath 220 may be coated with an anti-corrosion compound, for example, blown asphalt, etc. on the surface to further improve corrosion resistance, water resistance, etc.
  • a copper wire straight tape or a moisture absorbing layer 218 may be additionally provided between the metal sheath 220 and the cable core.
  • the commercial copper wire direct tape consists of copper wire and non-woven tape to facilitate electrical contact between the outer semiconducting layer 216 and the metal sheath 220, and the moisture absorbing layer absorbs moisture that has penetrated the cable. It is composed of powder tape, coating layer or film including super absorbent polymer (SAP) which has high absorption rate and excellent ability to maintain the absorption state. Play a role.
  • the copper direct tape and the water absorbing layer preferably has a semi-conductivity to prevent a sudden electric field change, it may be configured to include a copper wire in the moisture absorbing layer so that both conduction and water absorption.
  • the polymer sheath 222 is formed on the outside of the metal sheath 220 to improve the corrosion resistance, degree of ordering, etc. of the cable, and to perform a function of protecting the cable from mechanical trauma and other external environmental factors such as heat and ultraviolet rays. Can be.
  • the polymer sheath 222 may be formed of polyvinyl chloride (PVC), polyethylene, or the like, and in the case of a power cable installed on the sea floor, it is preferable to use a polyethylene resin having excellent water repellency, and flame retardancy is required. It is preferable to use polyvinyl chloride resin in the environment.
  • the power cable 200 has a metal reinforcing layer 224 composed of a galvanized steel cape or the like inside or outside the polymer sheath, and the metal sheath 220 is expanded by the expansion of the insulating oil. You can prevent it.
  • the upper and / or lower portion of the metal reinforcing layer 224 may be provided with a bedding layer (not shown) made of a semi-conductive nonwoven tape or the like to buffer the external force applied to the power cable, polyvinyl chloride to polyethylene, etc.
  • the outer sheath 226 made of resin is further provided to further improve the corrosion resistance, the degree of orderability, and the like of the power cable, and further protect the cable from mechanical trauma and other external environmental factors such as heat and ultraviolet rays.
  • the electric power cable installed on the seabed is easily damaged by the anchor of the ship, and may be damaged by bending force caused by currents or waves, friction with the sea bottom, etc.
  • 230 and 232 may be further provided.
  • the cable sheath may include an armor layer 230 and a serving layer 232.
  • the armor layer 230 may be made of steel, galvanized steel, copper, brass, bronze, and the like, and may be constituted by at least one layer by cross winding a wire having a circular cross section or the like, and the mechanical characteristics of the power cable It not only functions to enhance the performance and performance, but also additionally protects the cable from external forces.
  • the serving layer 232 formed of polypropylene yarn or the like is formed in one or more layers on the upper and / or lower portion of the armor layer 230 to protect the cable, and the serving layer 232 formed at the outermost portion is colored. It is composed of two or more different materials to ensure visibility of cables laid on the sea floor.
  • the ultra high voltage DC power cable system includes a pair of ultra high voltage DC power cables in which the conductor 210, the internal semiconducting layer 212, the insulating layer 214, and the external semiconducting layer 216 are sequentially exposed.
  • the intermediate junction box 300 may be provided with an intermediate junction box 300 for connecting the pair of power cables to each other.
  • the insulating layer 214 surrounds the inner semiconducting layer 212 and surrounds the first insulating layer 214A made of kraft paper, and the second insulating layer 214B made of composite insulating paper surrounding the system 1 insulating layer 214A. And a third sheet made of kraft paper surrounding the second insulating layer 214B.
  • the insulating layer 214C may be included, and the kraft paper or the composite insulating paper may be formed by impregnating the insulating oil.
  • the intermediate junction box 300 may include a conductor crimp sleeve 400 that electrically connects the exposed pair of conductors.
  • the intermediate junction box 300 may include the conductor crimp sleeve 400 and a reinforcement insulating layer 310 surrounding the pair of conductors or insulating layers exposed by the power cable.
  • the conductor crimp sleeve 400 grips each end of the pair of conductors 210 exposed by the pair of power cables 200 to electrically connect the pair of power cables 200 to the connected state.
  • Strongly support The reinforcing insulating layer 310 may be formed by winding kraft paper or composite insulating paper and impregnating it with insulating oil.
  • the reinforcing insulating layer 310 may wind the innermost layer 310A and the composite insulating paper wound only kraft.
  • the outermost layer 310D may be included.
  • the ultra-high voltage DC power cable system of the present invention will be described in detail centering on the intermediate junction box including the reinforcement insulating layer 310 including kraft paper and composite insulating paper.
  • the conductor crimp sleeve 330 and the cable insulation layer are provided.
  • a predetermined space may remain between the inner layers 214A, and the predetermined space may exist to prevent the insulating layer of the power cable from being damaged when the conductive crimp sleeve 400 is described below.
  • the innermost layer 310A of the reinforcing insulating layer 310 may be formed by winding insulating paper in a space between the conductor crimp sleeve 400 and the inner layer 214A of the cable insulating layer 214.
  • the kraft paper is wound around the inner layer 214A of the cable insulation layer, and the reinforcement insulating layer ( The innermost layer 310A of 310 can be formed.
  • the outermost surface of the innermost layer 310A composed of only kraft among the reinforcing insulating layers 310 is approximately the same as the outermost surface of the inner layer 214A of the cable insulation layer 214 from the longitudinal central axis of the cable. It is located in the street.
  • a semiconductive tape may be wound on the outer surface of the conductor pressing sleeve 400.
  • the outermost surface of the innermost layer 310A of the reinforced insulation layer 310 is formed by forming the innermost layer 310A of the reinforced insulation layer 310 so that the outermost surface of the first insulating layer 214A of the power cable and the It may be formed to be located at approximately the same distance from the longitudinal central axis.
  • the innermost layer 310A of the reinforcing insulating layer adjacent to the conductor and the conductor crimp sleeve 400 has a relatively high temperature to lower the viscosity of the impregnated insulating oil and to move outward by thermal expansion. In this case, the viscosity of the transferred insulating oil becomes high and does not return to the original state, so that voids may occur, which may act as a weak part of insulation.
  • the innermost layer 310A of the reinforcement insulating layer 310 by kraft paper, there is a difference in resistance between the composite insulating paper of the U intermediate layer 310B to be described later, the kraft paper having a low resistivity
  • the innermost layer 310A wound has a relatively low resistivity to mitigate an electric field distributed to the weak insulation portion.
  • the outermost layer 310D of the reinforcing insulating layer 310 is formed above the outer diameter of the exposed insulating layer 214 of the cable 200.
  • the height of the conductor section is increased not only by the thickness of the conductor crimping sleeve 400, but also when the cable is energized. It will happen a lot.
  • the reinforcement insulating layer 310 is not formed continuously with the cable insulation layer 214, and removes a portion of the insulating layer 214 of the power cable and the pair of the conductive crimp sleeve 400 to the conductor crimp sleeve 400.
  • the gap between the cable insulating layer 214 and the reinforcing insulating layer 310 is likely to occur, and thus the insulation performance is relatively weak.
  • the outermost layer of the reinforcing insulating layer 310 above the outer diameter of the exposed insulating layer 214 of the cable 200 such that the reinforcing insulating layer 310 has a larger outer diameter than the cable insulating layer 214. It is necessary to form the 310D to reinforce the insulation performance.
  • the outermost layer 310D of the reinforcing insulating layer may be composed of a composite insulating paper having a higher resistivity than kraft paper.
  • a gap between the cable insulating layer 214 and the reinforcing insulating layer 310 is likely to occur, so that an electric field concentrated in a region in which insulation performance is relatively weak is reduced to the outermost layer 310D of the reinforcing insulating layer 310.
  • intermediate layers 310B and 310C including a composite insulating paper layer may be provided between the innermost layer 310A and the outermost layer 310D of the reinforcing insulating layer 310.
  • the intermediate layer of the reinforcing insulating layer 310 may include a first intermediate layer 310B and a second intermediate layer 310C sequentially from the inner side to the outer side between the innermost layer 310A and the outermost layer 310D.
  • the innermost layer 310A of the reinforcing insulating layer 310 is made of kraft paper
  • the first intermediate layer 310B, the second intermediate layer 310C, and the outermost layer of the reinforcing insulating layer 310 ( 310D) are all composed of composite insulating paper.
  • the innermost layer 310A of the reinforcing insulating layer 310 is made of an insulating paper layer, and the first intermediate layer 310B and the second intermediate layer 310C are composed of a composite insulating paper, an electric field is distributed according to resistivity.
  • the first intermediate layer 310B (the second intermediate layer 310C) and the outermost layer 310D formed of a composite insulating paper having a relatively higher resistivity than the kraft paper of the innermost layer 310A of the reinforcement insulating layer according to the resistive electric field distribution characteristic of the DC cable. Therefore, a large amount of electric field is distributed in the cable, so that the cable becomes relatively hot and shrinkage / expansion of the insulating oil is relatively active.
  • the reinforcement insulating layer 310 may include a first intermediate layer 310B made of composite insulating paper and a second intermediate layer 310C made of kraft paper.
  • the first intermediate layer 310B and the second intermediate layer 310C provided between the innermost layer 310A and the outermost layer 310D of the reinforcing insulating layer 310 may each be an insulating layer of the cable 200.
  • the second insulating layer 214B and the third insulating layer 214C of 214 are disposed at the same distance from the center of the cable 200.
  • the reinforcement insulating layer 310 is made of the same material as the insulating layer 214 of the cable 200 and / or below the outer diameter of the exposed insulating layer 214 of the cable 200. Or it can be said to have a configuration.
  • the innermost layer 310A and the outermost layer 310D of the cable 200 are made of kraft paper and composite insulating paper, respectively, as in the aforementioned embodiment ⁇ .
  • the innermost layer 310A of the reinforcing insulating layer 310 is formed by winding kraft only, and since the first intermediate layer 310B and the outermost layer 310D are made of composite insulating paper, the electric field is dependent on the resistivity.
  • the first intermediate layer 310B and the outermost layer 310D which are formed of a North American insulation paper having a resistivity larger than the kraft paper of the innermost layer 310A of the reinforcement insulating layer according to the resistive electric field distribution characteristic of the DC cable. Many electric fields are distributed.
  • Comparative Example is a configuration for comparison with the embodiment 'Comparative Example ⁇ is a configuration in which the reinforced insulating layer 310 is all composed of composite insulating paper,' Comparative Example 2 'is the outermost layer kraft paper compared to the' Example 2 ' There is a difference in that it is configured 'Comparative Example 3' is the reinforcement insulating layer 310 is all made of kraft paper. On the other hand, 2 and 3 in Fig.
  • the point 2 shows the point where the electric field is measured in each configuration in order to compare the Example and the comparative example.
  • the point 1 is a point for measuring an electric field through the first insulating layer 214A, the second insulating layer 214B and the third insulating layer 214C, and the reinforcing insulating layer 310 of the cable insulating layer 214.
  • the reinforcement insulating layer 310 may be composed of the outermost layer 310D including the composite insulating paper.
  • point 2 is a point for measuring the electric field through the first insulating layer 214A of the cable insulating layer 214, part of the system 2 insulating layer 214B and the reinforcing insulating layer 310.
  • the reinforcing insulating layer 310 is composed of all of the composite insulating paper in the embodiment ⁇ , or the first intermediate layer 310B consisting of the composite insulating paper in Example 2 and the second intermediate layer 310C consisting of kraft paper and It may be composed of the outermost layer 310D composed of a composite insulating paper.
  • point 3 corresponds to a point for measuring an electric field through the first insulating layer 214A and the reinforcing insulating layer 310 of the cable insulating layer 214.
  • the reinforcing insulating layer 310 is composed of both composite insulating paper in the embodiment ⁇ , or the first intermediate layer 310B consisting of composite insulating paper in the second embodiment and the second intermediate layer 310C consisting of kraft paper and It may be composed of the outermost layer 310D composed of a composite insulating paper.
  • 3 to 7 illustrate the electric field distribution from the inside of the intermediate junction box to the outside by measuring the electric field at the points 1, 2, and 3 described above in the case of Examples 1, 2 and Comparative Examples 1-3. Each graph is shown. The horizontal axis in each graph is the central axis of the cable. The distance to the outside (mm) is shown, and the vertical axis shows the electric field value (kV / kV).
  • 3 is a graph illustrating electric field distribution from the inside of the intermediate junction box to the outside by measuring an electric field at the above-described points 1, 2, and 3 in the case of the embodiment ⁇ . (A) of FIG.
  • Fig. 3 (b) shows the result of measuring the electric field at the point 2 and the point 3 (c) of the point 3 respectively.
  • the maximum electric field at the point 1 is approximately 8.4 kV / mm
  • Fig. 4 (b) shows the result of measuring the electric field at the point 2 and the point 3 (c) of Fig. 4 respectively.
  • the maximum electric field at the point 1 is approximately 8.56 kV / k
  • Figure 5 shows the respective graphs showing the electric field distribution from the inside of the intermediate junction box to the outside by measuring the electric field at the above 1, 2 and 3 in the case of Comparative Example ⁇ . (A) of FIG.
  • FIG. 5 shows the result of measuring the electric field at the point 2 and the point (c) of FIG. 5 respectively.
  • the maximum electric field is approximately 8.43 kV / mm
  • the maximum electric field is approximately 8.44 kV / mm, and at point 3 the maximum electric field corresponds to approximately 8.96 kV / mm.
  • a composite insulating paper is wound in a space between the conductor crimp sleeve 400 and the first insulating layer 214A of the power cable to cover the innermost layer 310A of the reinforcing insulating layer 310. Should be formed. Therefore, the composite insulating paper must be cut and wound to a width wider than the space between the conductor crimp sleeve 330 and the first insulating layer 214A located at the innermost side of the cable insulating layer 214, thereby significantly reducing the workability.
  • the composite insulating paper is an insulating paper such as kraft paper and polypropylene (Polypropyl ene) Since thermoplastic resins such as resins are laminated, the kraft paper and the polypropylene resin are peeled off when the composite insulating paper is slightly cut.
  • the innermost layer 310A of the reinforcing insulating layer 310 is composed of a composite insulating paper, there is no difference in resistivity from the composite insulating paper forming the first intermediate layer.
  • Fig. 6 (b) shows the result of measuring the electric field at the point 2, and the point 6 (c) at the point 3.
  • the maximum electric field at the point 1 is approximately 26.0 kV / mm
  • the maximum electric field at the point 2 is approximately 26.0 kV / mm and the maximum electric field at the point 2 corresponds to approximately 26.2 kV / mm, indicating that the measured electric field value is relatively high, resulting in poor insulation stability.
  • the outermost layer 310D of the reinforcing insulating layer is formed of insulating paper.
  • the electric field distribution depends on the resistivity of the material, and according to the electric field distribution, the outermost layer 310D of the reinforcing insulating member 310 composed of insulating paper having a relatively low resistivity plays a role of insulation reinforcement.
  • FIG. 8 is a cross-sectional view visually showing the electric field distribution in the case of Comparative Example 2.
  • the electric field distribution is formed by the second insulating layer 214B and the reinforcing insulating layer 310 of the cable insulating layer. It can be seen that it is concentrated in one intermediate layer 310B.
  • FIG. 7 shows respective graphs showing the electric field distribution from the inside of the intermediate junction box to the outside by measuring the electric field at the above points 1, 2, and 3 in the case of Comparative Example 3.
  • FIG. 7 (a) is a point 1
  • FIG. 7 (b) is a point 2
  • FIG. 7 (c) is a point 3, respectively. Show the results.
  • the maximum electric field at point 1 corresponds to approximately 8.59 kV / rnm
  • the maximum electric field at point 2 corresponds to approximately 31.5 kV / ⁇
  • the maximum electric field corresponds to approximately 26.2 kV / ⁇ at point 3.
  • the measured electric field value is relatively high and the insulation stability is deteriorated.
  • all the reinforcing insulating layers 310 are made of kraft paper.
  • FIG. 9 is a cross-sectional view visually showing the electric field distribution in the case of 'Comparative Example 3' it can be seen that the electric field distribution is concentrated on the second insulating layer 214B of the cable insulation layer as described above.
  • 10 to 18 are cross-sectional views illustrating a state in which a pair of conductors 210 and 210 'are electrically connected to each other by a conductor crimp sleeve in an ultra-high voltage direct current power cable system.
  • FIG. 10 when electrically connecting the pair of conductors 210 and 210 ′, each end of the pair of conductors 210 and 210 ′ is inserted into a conductor receiving portion of the conductor crimp sleeve 330.
  • the outer surface of the conductor pressing sleeve is pressed by a pressing device to firmly support the connection state by holding the pair of conductors, and after pressing the outer surface of the conductor pressing sleeve is evenly trimmed.
  • the conductor crimp sleeve 330 is at least two wrinkles 332 formed to protrude to the outer surface and at least one wrinkles 334 formed between the wrinkles as shown in FIG. 11 to 12, the area where the corrugated acid 332 is formed is compressed by the crimping device to protrude into the conductor crimp sleeve 330 to grip an end portion of each conductor.
  • the outer surface of the conductor crimp sleeve 330 which is uneven by crimping may be smoothed to prevent electric field concentration or corona discharge of the outer surface of the conductor crimp sleeve.
  • the power cable system formed by connecting the pair of power cables 200 to each other in the case of installing a cable, such as the tension is applied to the cable 200 by the load of the power cable 200, etc.
  • Said conductor connected to said crimp sleeve 330 The connecting portion of the conductors 210 and 210 'of the cable 200 requires a certain level of tensile strength.
  • the conductor pressing sleeve 330 has a reduced cross-sectional area.
  • FIGS. 11 to 12 the ends of the pair of conductors 210 and 210 'inserted into the conductor pressing sleeve 330 by the force acting when the conductor pressing sleeve 330 is pressed are shown in FIGS. 11 to 12. Spaced apart from each other as shown. Therefore, as shown in FIG. 11, the pair of conductors are spaced apart from each other, and tension is locally concentrated in the region 'A' where the cross-sectional area of the conductor crimp sleeve 330 is reduced by trimming, thereby reducing the tensile force. In addition, as shown in FIG.
  • a path through which current flows from the conductor 210 on one side to the conductor 210 on the other side is formed in an area 'A' of the crimping sleeve 330.
  • the pair of conductors are spaced apart from each other, the cross-sectional area of the crimping sleeve 330 is reduced to reduce the path for the current can move to eventually generate a local heat generated in the 'A' region, due to deterioration It can shorten the life of the intermediate junction box.
  • 13 to 15 are cross-sectional views illustrating a state in which a pair of conductors 210 and 210 'are connected to a conductor crimp sleeve 400 according to an embodiment of the present invention in an ultra-high voltage direct current power cable system.
  • the conductor crimping sleeve 400 is formed of a hollow body and includes a conductor accommodating portion therein so that the conductors of the pair of power cables are respectively accommodated in the conductor accommodating portion, and at least protruded from an outer surface thereof.
  • a body portion 450 including at least two wrinkles 430 and at least one wrinkle bone 440 formed between the wrinkles 440 and the body portion 450 is provided in the body portion 450 It may include a reinforcement portion 410 is formed extending in the longitudinal direction of the.
  • the conductor crimp sleeve 400 is formed of copper or aluminum, preferably made of the same material as any one of the pair.
  • the reinforcement part 410 may be formed such that the thickness is greater than or equal to the thickness of the outermost layer of the pair of conductors 210 and 210 ′.
  • the meaning of the outermost layer thickness of the pair of conductors 210 and 21 means a single flat and wire layer 210C located at the outermost part when the conductors 210 and 210 'are made of the flat conductor as described above.
  • the conductors 210 and 210' may be defined as a single element wire layer stranded at the outermost part of the conductors 210 and 210 '. .
  • the reinforcing portion 410 is formed to extend continuously in the longitudinal direction of the conductor pressing sleeve 400, both ends of the reinforcing portion is spaced in the longitudinal direction from both ends of the conductor pressing sleeve 400, respectively. It may be formed to be preferably located on the inner surface of the conductor crimping sleeve 400 is raised to the position where the pleated acid (430) is formed. In this case, when compressing the conductor crimp sleeve 330 by pressing the wrinkle acid 430, the gap between the conductor crimp sleeve 400 and the pair of conductors (210, 210 ') is prevented from occurring. can do.
  • the reinforcement may be integrally formed with the conductor crimp sleeve. That is, by forming the reinforcement part 410 integrally with the conductor crimping sleeve 400 so as to extend from the inner surface of the conductor crimping sleeve 400, the tensile strength of the conductor crimping sleeve can be improved.
  • a step corresponding to the thickness of the reinforcement part 410 is formed at each end.
  • the pair of conductors 210 and 210 ' are fitted to the conductor crimp sleeve 400, and the outer surface of the conductor crimp sleeve 400 is crimped with a crimping device to form wrinkles on the inner surface.
  • a crimping device to form wrinkles on the inner surface.
  • the ultra-high voltage DC power cable sheath 3 ⁇ 4 having a conductor crimp sleeve 400 is the conductor (210, 210 ') at each end of the pair of conductors (210, 210')
  • the constituent flat element wire layer to element wire layer are removed as much as the thickness 'D' of the reinforcement part 410 and inserted into the conductor crimp sleeve 400.
  • the conductor (210, 210 ') is made by twisting a plurality of circular wires, at least one layer of the outer portion is removed and inserted into the conductor crimp sleeve (400), and the conductor (210, 210') is a flat conductor In the case of At least one flat wire layer 210C is removed and inserted into the conductor crimp sleeve 400.
  • the formed area is compressed with a crimping device, as shown in FIGS. 14 to 15, a wrinkle formed between the wrinkled peak 430 ′ and the wrinkled peak 430 ′ protruding into the inside of the conductor crimp sleeve 400.
  • the outer surface of the conductor crimp sleeve 400 which is formed by the valleys 440 'and grips the ends of the conductors and becomes uneven by crimping, is smoothly trimmed to prevent electric field concentration or corona discharge on the outer surface of the conductor crimp sleeve. Can be.
  • the reinforcing part 410 is provided, even when the conductor crimping rib 400 is pressed and the outer surface is trimmed, the thickness of the conductor crimping sleeve 400 may be reduced to prevent the deterioration of the tensile force.
  • the allowable tensile load is 17.68 tons before pressing and finishing the outer surface, but after the crimping, the tensile strength is reduced to 15.35 tons, thereby not satisfying the above criteria.
  • the allowable tensile load is 34.60 tons before pressing and trimming the outer surface, 32.27 tons after crimping and satisfies the above criteria and shows a much improved value compared to the structure of FIG. Can be.
  • the intermediate junction box includes a conductor crimp sleeve 500 that connects the pair of conductors 210 and 210 ', and the pair of conductors inside the conductor crimp sleeve 500.
  • FIG. (210, 210 ') may be provided with a conductor connecting portion 600 in contact with each other.
  • the conductor connecting portion 600 is formed in a structure in which each end of the conductor (210, 210 ') are symmetrical with each other to increase the area in contact with each other.
  • one conductor 210 may include a protrusion 2100 and the other conductor 210 ′ may include a recess 2200 facing the protrusion 2100.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Cable Accessories (AREA)

Abstract

La présente invention concerne : un manchon de compression de conducteur permettant de connecter électriquement, l'un à l'autre, les conducteurs d'une paire de câbles d'alimentation en courant continu à ultra-haute tension comprenant les conducteurs, des couches semi-conductrices internes, des couches isolantes, et des couches semi-conductrices externes ; et un système de câble d'alimentation en courant continu à ultra-haute tension l'utilisant.
PCT/KR2016/010114 2015-09-23 2016-09-08 Manchon de compression de conducteur et système de câble d'alimentation en courant continu à ultra-haute tension l'utilisant WO2017052119A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
KR20150134457 2015-09-23
KR10-2015-0134457 2015-09-23
KR1020160109852A KR102594700B1 (ko) 2015-09-23 2016-08-29 도체 압착슬리브 및 이를 이용한 초고압 직류 전력 케이블 시스템
KR10-2016-0109852 2016-08-29

Publications (1)

Publication Number Publication Date
WO2017052119A1 true WO2017052119A1 (fr) 2017-03-30

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109448901A (zh) * 2018-10-10 2019-03-08 江苏源达线缆科技有限公司 低损耗同轴电缆

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07274370A (ja) * 1994-04-04 1995-10-20 Sumitomo Electric Ind Ltd 電力ケーブル接続部
JPH08149648A (ja) * 1994-11-25 1996-06-07 Hitachi Cable Ltd Ｃｖケーブルの長尺布設方法
JPH10145956A (ja) * 1996-11-06 1998-05-29 Mitsubishi Cable Ind Ltd 電力ケーブルの接続部及び接続方法
KR19980042478U (ko) * 1996-12-24 1998-09-25 김종진 전로의 서브랜스 부착지금 제거장치
JP2010097775A (ja) * 2008-10-15 2010-04-30 Sumitomo Electric Ind Ltd ソリッドケーブルの中間接続構造

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH07274370A (ja) * 1994-04-04 1995-10-20 Sumitomo Electric Ind Ltd 電力ケーブル接続部
JPH08149648A (ja) * 1994-11-25 1996-06-07 Hitachi Cable Ltd Ｃｖケーブルの長尺布設方法
JPH10145956A (ja) * 1996-11-06 1998-05-29 Mitsubishi Cable Ind Ltd 電力ケーブルの接続部及び接続方法
KR19980042478U (ko) * 1996-12-24 1998-09-25 김종진 전로의 서브랜스 부착지금 제거장치
JP2010097775A (ja) * 2008-10-15 2010-04-30 Sumitomo Electric Ind Ltd ソリッドケーブルの中間接続構造

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109448901A (zh) * 2018-10-10 2019-03-08 江苏源达线缆科技有限公司 低损耗同轴电缆

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