WO2018182080A1 - Système de jonction de câble d'alimentation en courant continu - Google Patents

Système de jonction de câble d'alimentation en courant continu Download PDF

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Publication number
WO2018182080A1
WO2018182080A1 PCT/KR2017/003608 KR2017003608W WO2018182080A1 WO 2018182080 A1 WO2018182080 A1 WO 2018182080A1 KR 2017003608 W KR2017003608 W KR 2017003608W WO 2018182080 A1 WO2018182080 A1 WO 2018182080A1
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Prior art keywords
layer
cable
conductor
electric field
insulating
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PCT/KR2017/003608
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English (en)
Korean (ko)
Inventor
채병하
Original Assignee
엘에스전선 주식회사
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Priority to PCT/KR2017/003608 priority Critical patent/WO2018182080A1/fr
Publication of WO2018182080A1 publication Critical patent/WO2018182080A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/20—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances liquids, e.g. oils
    • 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
    • H01B9/02—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients

Definitions

  • the present invention relates to a DC power cable intermediate connection system.
  • a power cable is used to supply power to a desired place through the ground, the ground or the sea floor by using a conductor that supplies the power.
  • the power cable is connected by an intermediate junction box (Joint box) at intervals of several hundred meters or tens of kilometers, and the end of the power cable is connected to the overhead line by a termination connection box.
  • the conductor is first connected while the insulation layer of the cable is exposed, and the reinforcement insulation layer is formed by winding the insulation paper impregnated with high viscosity insulation oil on the surface of the insulation layer. .
  • the insulating paper is supported, and then the outer semiconducting layer, the metal sheath and / or the anticorrosive layer are restored.
  • the first reinforcing insulating layer may be formed up to the outer diameter of the cable insulating layer, and the second reinforcing insulating layer may be formed over the outer diameter of the cable for reinforcing insulation performance.
  • slope portions are formed on both sides of the second reinforcement insulating layer, and the junction box outer semiconducting layer formed by restoring the outer semiconducting layer of the cable on the slope portion is sloped.
  • the difference in volume resistance between the junction box outer semiconducting layer and the second reinforcing insulation layer and the geometric shape of the junction box outer semiconducting layer are dispersed to disperse the equipotential lines continuous from the insulating layer inside the intermediate junction box. You can control the electric field.
  • a pair of DC power cables having a conductor, an internal semiconducting layer, a cable insulation layer, and an external semiconducting layer may be connected to each other.
  • the pair of DC power cables are provided so that each end of the conductor, the inner semiconducting layer, the cable insulation layer and the outer semiconducting layer are sequentially exposed to each other.
  • the intermediate junction box may include: a conductor connecting portion electrically connecting the conductors of the pair of cables to each other; And a first reinforcing insulating layer wound around the conductor connecting portion, the exposed internal semiconducting layer and the cable insulating layer, and formed up to the outer diameter of the cable insulating layer, the first reinforcing insulating layer having inclined surfaces at both ends in the longitudinal direction, and the first reinforcing insulating layer.
  • a reinforcing insulating layer including a second reinforcing insulating layer having a decreasing slope portion;
  • An electric field relaxation layer formed of a material having a lower volume resistivity than the first reinforcing insulation layer between the first reinforcing insulation layer and the conductor connecting portion to the inner semiconducting layer;
  • an electric field shift layer disposed between the slope portion and the cable insulation layer. It may be provided.
  • the electric-field stress-control layer has a volume resistivity than that of the first insulating layer may be lower than 10 twice.
  • the field relaxation layer is a thickness of the field relaxation layer formed on the conductor connection portion may be 1.6 ⁇ 96% of the total thickness of the field relaxation layer.
  • the cable insulation layer may include: a first cable insulation layer surrounding the inner semiconductive layer and made of kraft paper impregnated with insulating oil; A second cable insulating layer surrounding the first cable insulating layer, the second cable insulating layer made of a composite insulating paper impregnated with insulating oil; And a third cable insulating layer surrounding the second cable insulating layer, the third cable insulating layer made of kraft paper impregnated with insulating oil, wherein the cable insulating layer includes the inner semiconducting layer, the first cable insulating layer, and the second cable insulating layer.
  • a first penciling stage consisting of a portion;
  • a second penciling stage having a step on the first penciling stage and comprising the second cable insulation layer;
  • a third penciling stage having a step on the second penciling stage and comprising a portion of the second cable insulating layer and a third cable insulating layer;
  • the height difference between the maximum height of the field relaxation layer and the height of the first cable insulation layer may be 430% or less of the height of the first cable insulation layer.
  • the height (or thickness) of the first cable insulation layer may be 1 to 10% of the total thickness of the cable insulation layer.
  • the maximum height of the field relaxation layer may be substantially the same as the height of the first penciling end.
  • the conductor connecting portion is a conductor crimp sleeve that grips the conductors of the pair of power cables and electrically connects each other
  • the intermediate junction box is disposed between the conductor crimp sleeve and the conductor and is separated from the conductor.
  • Copper outflow prevention unit for preventing the flow of copper ( ⁇ ) that can occur; It may be provided.
  • the copper powder leakage preventing unit Copper powder leakage preventing plate disposed between the conductor crimp sleeve and the conductor; A first electric field homogenization layer disposed between the conductor crimp sleeve and the conductor or between the reinforcement insulating layer and the conductor; A second field uniformity layer disposed between the reinforcement insulating layer and the conductor crimp sleeve, or between the reinforcement insulating layer and the first field uniformity layer; And a pressing layer disposed between the reinforcing insulating layer and the conductor crimp sleeve, or between the reinforcing insulating layer and the conductor. It may include.
  • the conductor crimping sleeve includes a body portion having at least two wrinkles formed to protrude from the inner surface and at least one wrinkled bone formed between the wrinkles, wherein the copper powder leakage preventing plate is the body portion and the It can be arranged between the conductors.
  • the copper powder leakage preventing plate may be arranged from one end of the conductor pressing sleeve to beyond the corrugated acid.
  • the copper powder leakage preventing plate may be disposed between the body portion and the conductor to reach from one end to the other end of the conductor pressing sleeve.
  • the copper powder leakage preventing plate may be terminated in the longitudinal direction of the conductor.
  • the copper powder leakage preventing plate may be made of a metal or alloy of the same series as the conductor.
  • the first field homogenization layer may be made of a semi-conducting tape transversely wound so as to be spaced apart in the longitudinal direction of the DC power cable.
  • the first field homogenization layer may be formed by transversely winding the semiconductive tape so as to overlap the conductor of the cable in the longitudinal direction of the cable.
  • the first field homogenization layer may be formed by transversely winding a plurality of semiconductive tapes so as to overlap the conductor of the cable in the longitudinal direction of the cable.
  • the at least one portion of the first copper homogenizing layer and the at least one portion of the copper leakage plate may overlap each other.
  • the copper powder leakage preventing part may overlap at least a portion of the copper powder leakage preventing plate and at least a portion of the first electric field uniformization layer in the corrugated acid of the conductor pressing sleeve.
  • the copper powder outflow prevention portion may overlap each other between the one end of the conductor crimp sleeve and the vertex of the wrinkles formed on one end of the conductor crimp sleeve.
  • the first field homogenization layer may be formed continuously extending from the inner semiconducting layer of the cable.
  • the outer surface of the conductor crimp sleeve may further include a second electric field homogenization layer surrounding the first electric field homogenization layer.
  • the second field homogenization layer may be formed of a semiconductive tape having wrinkles formed therein.
  • the copper powder leakage preventing part may further include a pressure layer formed to surround the first electric field uniformization layer, the copper powder leakage preventing plate, the conductor crimp sleeve, and the second electric field uniform layer.
  • the pressing layer may be made of insulating paper.
  • the pressure layer may have a volume resistance of 10 2 or more lower than that of the reinforcing insulating layer.
  • the electric field shift layer may extend between the straight portion and the cable insulation layer as well as between the slope portion and the cable insulation layer.
  • the electric field shift layer may have a lower volume resistance than the second reinforcing insulating layer or the cable insulating layer.
  • the electric field shift layer when the cable insulation layer or the second reinforcement insulation layer in contact with the electric field shift layer is made of PPLP, the electric field shift layer may have a volume resistance of 10 2 times lower than the volume resistance of the PPLP.
  • the electric field shift layer may be made of kraft paper.
  • the electric field shift layer may be formed on the cable insulation layer or may be an outermost portion of the cable insulation layer as part of the cable insulation layer.
  • the electric field shift layer may be formed to a thickness of 5 to 15% of the thickness of the cable insulation layer.
  • the equipotential lines may be densely distributed in the slope portion of the intermediate junction box having a relatively thin insulating layer thickness, thereby preventing the electric field from being distributed as a weak insulation portion.
  • FIG. 1 is a perspective view showing an internal configuration of a power cable.
  • FIG. 2 is a partial cutaway view schematically showing a cable connected by an intermediate connection.
  • FIG. 3 is an enlarged view of a portion C of FIG. 2.
  • FIG. 4 is a cross-sectional view showing a conductor crimp sleeve before crimping.
  • FIG. 5 is a cross-sectional view showing a conductor crimp sleeve after crimping.
  • FIG. 6 is a cross-sectional view illustrating in detail the first reinforcing insulating layer and the second reinforcing insulating layer of the intermediate junction box shown in FIG. 2.
  • FIG. 7 is an enlarged view of a portion B of FIG. 6.
  • 8 to 12 are cross-sectional views of various embodiments showing conductor crimp sleeves after crimping.
  • the oil-impregnated cable is connected by intermediate connection at intervals of several hundred m or several km, and the end of the insulation-impregnated cable is connected to the overhead line by terminating the connection.
  • the configuration of the insulation oil-impregnated power cable will be described first, and then the connection process of the junction box will be described.
  • FIG. 1 is a partially cutaway perspective view illustrating an internal configuration of an ultra high voltage power cable.
  • the power cable 100 includes a conductor 11, an inner semiconducting layer 12, a cable insulation layer 14, and an outer semiconducting layer 16, along a cable length direction along the conductor 11. It is provided with a cable core portion 10 that transmits power only in such a way that a current does not leak in the cable radial direction.
  • the conductor 11 serves as a passage through which current flows to transmit power, and has a high conductivity to minimize power loss, and a material having strength and flexibility suitable for cable production and use, for example, copper or aluminum. Can be made.
  • the conductor 11 has a flat element layer 11C including a circular element element 11a and a flat element element 11b twisted and enclosed to enclose the element element 11a.
  • It may be a flat conductor having a circular cross section as a whole, and may be a circular compressed conductor compressed in a circular shape by twisting a plurality of circular wires as another example.
  • 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 11 is formed by stranding a plurality of element wires, the surface thereof is not smooth, so that an electric field may be uneven, and corona discharge is likely to occur partially.
  • the insulation performance may be reduced.
  • an inner semiconducting layer 12 may be formed outside the conductor 11.
  • the inner semiconducting layer 12 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 12 functions to stabilize the insulation performance by preventing a sudden electric field change between the conductor 11 and the cable insulation layer 14 to be described later. In addition, by suppressing uneven charge distribution on the conductor surface, the electric field is made uniform and the gap between the conductor 11 and the cable insulation layer 14 is prevented from forming so as to suppress corona discharge and insulation breakdown. do.
  • the cable insulation layer 14 is provided outside the inner semiconducting layer 12 to electrically insulate the outside from the current flowing along the conductor 11 so as not to leak to the outside.
  • the cable insulating layer 14 may be formed of insulating paper impregnated with insulating oil. That is, the cable insulating layer 14 may be formed by winding insulating paper in multiple layers so as to surround the internal semiconducting layer 12, and then impregnating the cable core with an insulating oil. As the insulating oil is absorbed into the insulating paper as described above, the insulating property of the cable insulating layer 14 may be improved.
  • the insulating oil is filled in the gaps between the inside of the insulating paper and the gap formed by winding the insulating paper to improve the insulating property, and to reduce the frictional force between the insulating paper during bending of the cable to improve the bending characteristics 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 11, and the impregnation temperature, for example, 100 ° C., may be used to easily impregnate the insulating paper.
  • 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 from which the organic electrolyte in the pulp is removed using kraft pulp as a raw material, or a composite insulating paper in which kraft paper is adhered to one or both surfaces of a plastic film.
  • the plastic film has a higher resistivity than kraft paper adhered to one or both sides thereof, so that even if bubbles are generated in kraft paper according to the flow of insulating oil during an impregnation process or a cable operation, the voltage applied to the bubbles can be alleviated, and polyethylene (Polyethylen) ), Polypropylene resins such as polypropylene, polybutylene, tetrafluoroethylene-hexaxafluoropropylene copolymer, ethylene-tetrafluoroethylene air It may be made of a fluororesin such as coalescing, and preferably made of a polypropylene homopolymer resin having excellent heat resistance.
  • the cable insulation layer 14 may be formed by winding only the kraft and impregnating the insulation 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, the impregnation temperature at the time of cable production or at the time of cable operation Thermal expansion occurs depending on the operating temperature.
  • the surface pressure is applied to the kraft paper stacked thereon to narrow the passage of the insulating oil, so that the flow of the insulating oil may be suppressed in the contraction / expansion of the insulating oil due to gravity or the temperature of the insulating oil.
  • the composite insulating paper has a higher insulation strength than kraft paper has the advantage of reducing the cable outer diameter.
  • the insulating oil of the cable insulating layer ie, the cable insulating layer formed on the inner semiconducting layer 12, which belongs to the upper section of the conductor is lowered in viscosity and thermally expands to move outward, and moves when the cable temperature falls.
  • the viscosity of the insulating oil becomes high and does not return to the original state, voids may occur in a portion of the cable insulating layer in the section immediately above the conductor.
  • a high electric field acts on the cable insulation layer formed in the direction of the outer semiconducting layer 16, which belongs to the cable insulation layer directly below the metal sheath, in which the electric field is gradually reversed according to the temperature difference and the electric field gradually increases.
  • 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., as a region in which a high electric field acts according to a temperature change inside the cable.
  • the kraft may be used as the insulating paper in the area including the weak insulation of the cable insulating layer (14). That is, the cable insulation layer 14 is divided into a first cable insulation layer, a second cable insulation layer, and a third cable insulation layer in a direction from the inner semiconducting layer 12 to the outer semiconducting layer 16 described later. Only kraft may be used for the cable insulation layer and / or the third cable insulation layer, and the composite insulation may be used for the second cable insulation layer.
  • a resistivity difference occurs between the second cable insulation layer wound with the composite insulation paper and the first cable insulation layer and / or the third cable insulation layer wound with the kraft paper, and the cable insulation layer wound with the kraft paper having a low resistivity (
  • the first cable insulation layer and / or the third cable insulation layer of 14) has a relatively low resistivity, and serves to alleviate an electric field distributed to the weak insulation portion.
  • a high electric field acts on the second cable 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 the first cable insulating layer and / or the third cable Since a relatively low electric field acts on the section immediately above the conductor and / or the section directly below the metal sheath included in the insulating layer, the electric field acting on the weak part of the insulation can be alleviated to stabilize the insulation performance.
  • the cable insulation layer 14 may form a third cable insulation layer thicker than the first cable insulation layer.
  • the metal sheath 22, which will be described later, is formed on the outside of the cable insulation layer 14, or when the cable core part is connected to two power cables sequentially exposed from the inside, and then the metal sheath 22 is restored. Since losing heat is applied to the second cable insulating layer of the cable insulating layer 14 to cause deformation of the plastic film, the second cable insulating layer is formed by forming a second cable insulating layer thicker than the first cable insulating layer. It is desirable to protect the plastic film from heat. In this case, the thickness of the first cable insulation layer may be selected in consideration of the impulse surge voltage required for the power cable.
  • An external semiconducting layer 16 may be provided outside the cable insulation layer 14.
  • the outer semiconducting layer 16 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 nonuniform charge distribution between the layer 14 and the metal sheath 22 described later is suppressed to stabilize the insulation performance.
  • the outer semiconducting layer 16 smoothes the surface of the cable insulating layer 14 in the cable to mitigate electric field concentration to prevent corona discharge, and also physically protects the cable insulating layer 14. Can be done.
  • the outer semiconducting layer 16 may further include a metallized paper.
  • the metallized paper may be formed by stacking a thin aluminum film on kraft paper, and a plurality of perforations may exist to facilitate the impregnation of the insulating film of the cable insulating layer 14.
  • the cable core part 10 may further include a moisture absorbing part 21 for preventing moisture from penetrating into the cable.
  • the moisture absorbing portion may be formed between the stranded wires of the conductor 11 and / or outside of the conductor 11, 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 including a super absorbent polymer (SAP), and serves to prevent moisture from penetrating in the longitudinal direction of the cable.
  • the moisture absorbing portion may have a semiconductivity to prevent a sudden electric field change.
  • the cable protection part 20 is provided outside the cable core part 10, and the power cable laid on the sea floor may further include a cable outer part 30.
  • the cable protector and the cable sheath protect the core from various environmental factors such as moisture penetration, mechanical trauma, and corrosion, which can affect the power transmission performance of the cable.
  • the cable protection unit 20 includes a metal sheath 22 and a polymer sheath 24 to protect the cable from accidental current, external force or other external environmental factors.
  • the metal sheath 22 may be formed to surround the core part 10.
  • the power cable when installed in an environment such as the seabed, it may be formed to seal the cable core portion 10 in order to prevent foreign substances such as moisture from entering the cable core portion 10,
  • the molten metal is extruded to the outside of the cable core 10 so as to have a seamless outer surface so that the ordering performance can be excellent.
  • Lead or aluminum is used as the metal, and in the case of a power cable installed on the sea floor, it is preferable to use lead having excellent corrosion resistance to seawater, and alloy lead containing a metal element to supplement mechanical properties. It is more preferable to use (Lead alloy).
  • the metal sheath 22 is grounded at the end of the power cable and serves as a passage through which an accident current flows in case of an accident such as a ground fault or a short circuit, and protects the cable from external shocks and prevents the electric field from being discharged to the outside of the cable. Can be.
  • the metal sheath 22 may be coated with an anti-corrosion compound, for example, blown asphalt, etc. on the surface to further improve the corrosion resistance, water resistance, and the like of the cable and to improve adhesion to the polymer sheath 24. Can be.
  • an anti-corrosion compound for example, blown asphalt, etc.
  • the copper sheath tape or the moisture absorbing layer 21 may be additionally provided between the metal sheath 22 and the cable core 10.
  • the copper wire direct tape consists of a copper wire and a nonwoven tape to facilitate electrical contact between the outer semiconducting layer 16 and the metal sheath 22, and the moisture absorbing layer absorbs moisture that has penetrated the cable. It is formed in the form of powder, tape, coating layer or film including super absorbent polymer (SAP) which has a high speed and excellent ability to maintain an absorbent state. Play a role.
  • the copper wire direct tape and the water absorbing layer preferably has a semi-conductivity in order to prevent a sudden electric field change, it may be configured to include a copper wire in the water absorbing layer so that both conduction and water absorption.
  • the polymer sheath 24 is formed on the outside of the metal sheath 22 to improve the corrosion resistance, degree of ordering, etc. of the cable, and to protect the cable from mechanical trauma and other external environmental factors such as heat and ultraviolet rays. Can be.
  • the polymer sheath 24 may be formed of a resin such as 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 an environment.
  • the power cable 100 includes a metal reinforcing layer 26 made of a galvanized steel cape or the like inside or outside the polymer sheath, and the metal sheath 22 is expanded by the expansion of the insulating oil. You can prevent it.
  • the upper and / or lower portion of the metal reinforcing layer 26 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 28 made of resin can be further provided to further improve the corrosion resistance, water resistance, etc. of the power cable, and further protect the cable from mechanical trauma and other external environmental factors such as heat and ultraviolet rays.
  • the power cable installed on the seabed is easy to be traumatized by the anchor of the ship, and may be damaged by bending force caused by currents or waves, friction with the sea bottom, etc. 30 may be further provided.
  • the cable sheath may include an armor layer 34 and a serving layer 38.
  • the armor layer 34 may be made of steel, galvanized steel, copper, brass, bronze, and the like, and may be configured 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 performance, but also protects cables from external forces.
  • the serving layer 38 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 34 to protect the cable, and the serving layer 34 formed on the outermost part is colored. It is composed of two or more different materials to ensure visibility of cables laid on the sea floor.
  • FIG. 2 is a partial cutaway view schematically showing a cable connected by an intermediate connection.
  • it is a partial cutaway view schematically showing a state in which the DC power cables 100A and 100B having the configuration as shown in FIG. 1 are connected to each other by the intermediate junction box 200.
  • 3 is an enlarged view of a portion C of FIG. 2.
  • first of the pair of DC power cables 100A and 100B, the cable insulation layers 14A and 14B and the conductors 11A and 11B are exposed to each other.
  • Each end of the conductors 11A and 11B may be electrically connected to form a conductor connecting portion.
  • the conductor connection serves as a path for current by the electrically connected conductors 11A and 11B, through which power can be transferred.
  • the conductor connecting portion is electrically connected to each other by crimping or welding the conductors 11A and 11B to the conductor crimp sleeve 1P.
  • the cable insulation layer 14A may include the first cable insulation layer 14A1, the second cable insulation layer 14A2, and the third cable insulation layer 14A3.
  • the cable insulation layer 14A can be penciled to have a multi-stage structure.
  • the cable insulation layer 14A may have a multistage structure of a first fencing stage 14a1, a second fencing stage 14a2, and a third fencing stage 14a3. It can be penciled.
  • the first penciling end 14a1 is composed of an inner semiconducting layer 12, a first cable insulating layer 14A1, and a part of the second cable insulating layer 14A2, and the second penciling end 14a2 is a second cable.
  • the insulating layer 14A2 may be formed, and the third penciling end 14a3 may include a portion of the second cable insulating layer 14A2 and the third cable insulating layer 14A3. This will be described later together with the reinforcement insulating layer.
  • a copper powder leakage preventing part PC may be disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B to prevent the copper powder from the conductors 11A and 11B from flowing out.
  • the copper powder leakage preventing part (PC) is between the conductor crimp sleeve (1P) and the conductor (11A, 11B), and / or the innermost layer (2101A) of the first reinforcing insulating layer (2101) and By being disposed between the conductors 11A and 11B, it is possible to prevent the copper generated in the conductors 11A and 11B from leaking into the reinforcing insulating layer 210.
  • the copper powder leakage preventing part PC is, for example, a first electric field uniformization layer 12 positioned on the conductor 11A exposed between the first penciling end 14a1 of the cable 100A and the conductor crimp sleeve 1P. ), And a copper powder leakage preventing plate 211 disposed between the conductor pressing sleeve 1P and the conductor 11A.
  • the first electric field uniformization layer 12 may be disposed between the conductor crimp sleeve and the conductor, and between the reinforcement insulating layer and the conductor. That is, the first electric field uniformization layer 12 may extend not only between the first cable insulation layer 14A1 and the conductor crimp sleeve 1P but also extend between the conductor crimp sleeve 1P and the conductor 11A.
  • the first electric field homogenization layer 12 may be formed by extending the inner semiconducting layer of the cable 100A. That is, the first electric field homogenization layer 12 is formed by removing the inner semiconducting layer itself as the inner semiconducting layer itself with the first cable insulation layer 14A1 and leaving a predetermined length. After this removal, the conductor 11A is exposed.
  • the first field homogenization layer 12 may be formed by winding at least one insulating sheet on the conductor 11A, but the first two sheets may be formed as a void and then as a gap winding.
  • the first electric field uniformization layer 12 has a plurality of semiconducting properties so as to overlap the innermost layer adjacent to the conductors 11A and 11B of the DC power cables 100A and 100B in the air, that is, in the longitudinal direction of the cable. It is formed by winding the tape, and after the winding, it can be made by the gap winding, that is, by winding the semiconducting tape which is a kind of insulating paper so as to be spaced apart in the longitudinal direction of the DC power cables 100A, 100B.
  • the first electric field uniformization layer 12 wraps the innermost layer adjacent to the conductors of the DC power cables 100A and 100B, that is, on the conductors 11A and 11B of the DC power cables 100A and 100B.
  • a sheet of carbon paper which is a kind of insulating paper, is superposed on one side of the DC power cables 100A and 100B to form a transverse winding in the longitudinal direction of the DC power cables. It is formed by the air space, and can be made by the side winding so that the gap winding, that is, a semi-conducting tape (carbon paper), which is a kind of insulating paper, is spaced apart in the longitudinal direction of the DC power cables 100A and 100B.
  • carbon paper which is a kind of insulating paper
  • the first electric field uniformization layer 12 is formed as a gap winding after the voiding space, it is possible to minimize the leakage of copper powder by minimizing the voids of the plurality of insulating papers (carbon paper). In addition, since a plurality of insulating papers (carbon papers) are blanked and then supported by a gap winding, bending characteristics can be improved.
  • the first electric field homogenization layer 12 may be extended between the conductor crimp sleeve 1P and the conductor 11A by exposing the inner semiconducting layer of the exposed cable 100A by removing the first cable insulation layer 14A1. . That is, one end of the first electric field uniformization layer 12 may be located between the conductor crimp sleeve 1P and the conductor 11A.
  • the first electric field homogenization layer 12 is, for example, a position at which a crimp (1Pa 'in FIG. 5) of the inner surface of the conductor crimp sleeve 1P formed by crimping the conductor crimp sleeve 1P starts, that is, conductor crimping. It may extend to one end of the sleeve 1P. As another example, as shown in FIG. 5, the first field homogenization layer 12 may extend to just before the highest ridge T in the corrugated acid (1Pa ′ in FIG. 5). This extension ensures a sufficient current path between the conductor 11A of the cable and the conductor crimp sleeve 1Pa. As another example, as shown in FIG. 6, the first field homogenization layer 12 may extend beyond the highest ridge T in the corrugated acid (1Pa ′ in FIG. 5). This will be described later.
  • the copper powder leakage preventing plate 211 may be disposed between the conductor crimp sleeve 1P and the conductor 11A. That is, the copper powder leakage preventing plate 211 may be disposed to correspond to the inside of the conductor compression sleeve 1P and may not exceed the conductor compression sleeve 1P. As another example, as shown in FIGS. 9 and 10, the copper flux leakage preventing plate 211 ′′ may extend beyond both ends of the conductor compression sleeve 1P as well as between the conductor compression sleeve 1P and the conductor 11A. .
  • the copper powder leakage preventing plate 211 may be formed of a material having a structure that is dense so that copper powder may not penetrate, and preferably, may be formed of a metal material capable of withstanding the force acting when the compression sleeve is pressed.
  • the copper powder leakage preventing plate 211 may be made of copper, aluminum, a copper alloy, or an aluminum alloy to correspond to the material of the conductors 11A and 11B of the cables 100A and 100B.
  • the copper powder leakage preventing plate 211 may be formed by, for example, wrapping a portion of the first electric field homogenization layer 12 and the conductor 11A with copper tape and ending or soldering the end portions of the copper tape which are in contact with each other. When both ends of the copper tape are soldered to form the copper leakage prevention plate 211, it is preferable to smoothly process the connection part of the solder so that no edge is generated.
  • the copper leakage prevention plate 211 is formed between the conductor pressing sleeve 1P and the conductor 11A so as to surround the cable conductor 11A by the end, so that the outflow path of the copper generated in the conductor 11A is minimized. As a result, the copper powder may be blocked by the copper powder leakage preventing plate 211.
  • One end of the copper powder leakage preventing plate 211 facing the end of the cable conductor 11A is over the corrugated peak 1Pa 'formed on its inner side by crimping the conductor crimp sleeve 1P to the corrugated bone 1Pb'.
  • the pressing force to the conductor crimp sleeve 1P can be applied.
  • the copper flow-out prevention plate 211 preferably extends beyond the ridgeline T, which is the highest point in the corrugated mountain 1Pa '.
  • the other end a2 of the copper powder leakage preventing plate 211 toward the first cable insulation layer 14A1 of the cable may protrude from the conductor crimp sleeve 1P and may not act as an edge.
  • 4 and 5 are cross-sectional views showing a state in which a pair of conductors 11A and 11B are electrically connected to each other by a conductor crimp sleeve.
  • 4 is a cross-sectional view showing a conductor crimp sleeve before the crimping
  • FIG. 5 is a cross-sectional view showing a conductor crimp sleeve after the crimping.
  • each end of the pair of conductors 11A and 11B is fitted to the conductor receiving portion of the conductor crimp sleeve 1P.
  • the outer surface of the conductor pressing sleeve is crimped by a crimping 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 smoothly trimmed to obtain a flat surface. Is formed.
  • the conductor crimp sleeve 1P has at least two protrusions 1Pa protruding from the outer surface and at least one recess 1Pb formed between the protrusions 1Pa, as shown in FIG. 5. And a region in which the protrusion 1Pa is formed as shown in FIG. 5 is compressed by the pressing device to protrude to the inside of the conductor pressing sleeve 1P to form a wrinkled peak 1Pa '. As a result, the end of each conductor is gripped, and the outer surface of the conductor pressing sleeve 1P which is uneven by pressing can be smoothed to prevent electric field concentration, corona discharge, etc. of the outer surface of the conductor pressing sleeve.
  • the first electric field homogenization layer 12 extends in the direction from the inner semiconducting layer of the cable 100A toward the conductor crimp sleeve 1P so that one end thereof is between the conductor crimp sleeve 1P and the conductor 11A.
  • the copper powder leakage preventing plate 211 has one end portion facing the end of the conductor 11A and the other end portion facing the first cable insulation layer 14A1 of the cable 100A does not protrude from the conductor crimp sleeve 1P. It can extend to the length of.
  • a wrinkle acid 1Pa ' is formed on the inner surface of the conductor crimp sleeve 1P, and the first electric field uniformization layer 12 is formed of the crimp acid ( 5, 1Pa ') extends to just before the highest ridge T, and the copper flow prevention plate 211 extends beyond the ridge T which is the highest point of the corrugated mountain 1Pa'. Can be.
  • FIG 8 to 12 are views showing various modifications of the first electric field homogenization layer and the copper powder leakage preventing plate.
  • the first electric field uniformization layer 121 extends from the inner semiconducting layer of the cable 100A toward the conductor pressing sleeve 1P so that one end thereof is the conductor pressing sleeve 1P and the conductor 11A. Disposed between the two parts, the one end portion of the copper leakage preventing plate 211 facing the first cable insulation layer 14A1 of the cable 100A does not protrude from the conductor crimp sleeve 1P and faces the end of the conductor 11A. The portion may extend to a predetermined length.
  • a wrinkled peak 1Pa ' is formed on the inner surface of the conductor crimp sleeve 1P, and the first electric field uniformization layer 121 is formed of the corrugated peak ( 1Pa ') extends beyond the highest ridge (T), the copper flow prevention plate 211 may extend beyond the ridge (T), the highest point in the corrugated mountain (1Pa').
  • the first electric field uniformization layer 122 extends from the inner semiconducting layer of the cable 100A toward the conductor crimp sleeve 1P so that one end thereof is the conductor crimp sleeve 1P and the conductor 11A. It is disposed between, and the copper powder outflow prevention plate 211 'may be disposed over the entire surface between the conductor pressing sleeve (1P) and the conductor (11A). That is, in Fig. 5, one copper powder leakage preventing plate 211 is disposed between the conductor 11A and the conductor pressing sleeve 1P, and another copper powder leakage between the conductor 11B and the conductor pressing sleeve 1P.
  • the prevention plate 211 is arranged, but in the embodiment shown in FIG. 11, one copper flux leakage prevention plate 211 'is disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B.
  • the copper leakage prevention plate 211 ′ has both ends, that is, an end facing the first cable insulation layer 14A1 of the cable 100A and an end facing the first cable insulation layer 14a1 of the cable 100A. It may be disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B without protruding from the sleeve 1P.
  • a wrinkle acid 1Pa ' is formed on the inner surface of the conductor crimping sleeve 1P, and the first electric field uniformizing layer 122 is formed of the corrugated acid ( 1 Pa ') can extend beyond the highest ridge T.
  • the first electric field uniformization layer 123 extends from the inner semiconducting layer of the cable 100A toward the conductor crimp sleeve 1P so that one end thereof is the conductor crimp sleeve 1P and the conductor 11A. It is disposed between, and the copper powder outflow prevention plate 211 'may be disposed over the entire surface between the conductor pressing sleeve (1P) and the conductor (11A). That is, in Figs. 5 and 8, one copper flux preventing plate 211 is disposed between the conductor 11A and the conductor pressing sleeve 1P, and another one between the conductor 11B and the conductor pressing sleeve 1P.
  • the copper powder leakage preventing plate 211 is arranged, but in the embodiment shown in FIG. 10, one copper powder leakage preventing plate 211 'is disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B.
  • the copper leakage prevention plate 211 ′ has both ends, that is, an end facing the first cable insulation layer 14A1 of the cable 100A and an end facing the first cable insulation layer 14a1 of the cable 100A. It may be disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B without protruding from the sleeve 1P.
  • a wrinkled peak 1Pa ' is formed on the inner surface of the conductor crimp sleeve 1P, and the first electric field uniformizing layer 123 is formed of the corrugated peak ( 1 Pa ') can be extended to just before the highest ridge T.
  • the first electric field uniformization layer 124 extends in the direction from the inner semiconducting layer of the cable 100A toward the conductor pressing sleeve 1P so that one end thereof is the conductor pressing sleeve 1P and the conductor 11A. Disposed between, the other end portion of the copper leakage preventing plate 211 ", which faces the first cable insulation layer 14A1 of the cable 100A, protrudes from the conductor crimp sleeve 1P and extends to the end of the conductor 11A. The one end facing toward the side may extend to a predetermined length.
  • a portion of the copper flux leakage preventing plate 211 " is disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B and the other portion of the conductor crimp sleeve ( It may extend beyond 1P) toward the cable insulation layer 14A.
  • crimping of the conductor crimp sleeve 1P forms a wrinkle acid 1Pa 'on the inner surface of the conductor crimp sleeve 1P
  • the first electric field uniformizing layer 124 is formed of the corrugated acid ( 1Pa ') extends beyond the highest ridge (T)
  • the copper flow prevention plate 211 may extend beyond the ridge (T), the highest point in the corrugated mountain (1Pa').
  • another portion of the copper leakage preventing plate 211 ′′ and the first electric field homogenization layer 124 may overlap each other.
  • the first electric field uniformization layer 125 extends from the inner semiconducting layer of the cable 100A toward the conductor pressing sleeve 1P so that one end thereof is the conductor pressing sleeve 1P and the conductor 11A. Disposed between, the other end portion of the copper leakage preventing plate 211 ", which faces the first cable insulation layer 14A1 of the cable 100A, protrudes from the conductor crimp sleeve 1P and extends to the end of the conductor 11A. The one end facing toward the side may extend to a predetermined length.
  • a portion of the copper flux leakage preventing plate 211 " is disposed between the conductor crimp sleeve 1P and the conductors 11A and 11B and the other portion of the conductor crimp sleeve ( It may extend beyond 1P) toward the cable insulation layer 14A.
  • a wrinkle acid 1Pa ' is formed on the inner surface of the conductor crimp sleeve 1P, and the first electric field uniformizing layer 124 is formed of the crimp mountain ( 1 Pa ') is less than the highest ridge (T) extends to just before that, the copper flow prevention plate 211 may extend beyond the ridge (T), the highest point in the corrugated mountain (1Pa').
  • the other portion of the copper flux leakage preventing plate 211 ′′ and the first electric field uniformization layer 125 may overlap each other.
  • the copper outflow prevention part PC may include a second field homogenization layer surrounding the first field uniformization layer 12, the copper outflow prevention plate 211, and the conductor compression sleeve 1P. 212 and a pressure layer 213 wound on the second electric field homogenization layer 212 may be further included.
  • the second electric field homogenization layer 212 wraps a carbon crepe to surround the first electric field homogenization layer 12, the copper powder leakage preventing plate 211, and the conductor crimp sleeve 1P so as to surround the first electric field homogenization layer 212.
  • the layer 12 By strongly adhering the layer 12, the copper powder outflow prevention plate 211, and the conductor crimp sleeve 1P, it is possible to further prevent the copper outflow. That is, it is difficult to maintain the high degree of smoothness after pressing the conductor crimp sleeve 1P and finishing the surface.
  • the second electric field homogenization layer 212 can uniform the surface by wrapping the outer circumferential surface of the polished conductor crimp sleeve 1P to make the electric field at the outer circumferential surface of the conductor crimp sleeve 1P uniform.
  • the second field uniform layer 212 may press the first field uniform layer 212 and the copper powder leakage preventing plate 211.
  • the second electric field uniformization layer 212 may support carbon creep paper as a wrap winding. That is, the second electric field uniformization layer 212 may be formed by supporting carbon creep paper so as to overlap in the longitudinal direction of the cable.
  • the second field homogenization layer 212 may be made of carbon paper as another example.
  • the second electric field homogenization layer 212 is preferably made of corrugated carbon paper when considering the step at both ends of the conductor crimp sleeve 1P.
  • the second electric field uniformization layer 212 is semiconductive, it is possible to prevent a sudden electric field change between the conductor crimp sleeve 1P and the reinforcement insulating layer 210.
  • the pressure layer 213 may be wound on the second field uniform layer 212.
  • the pressurized layer 213 can be more reliably prevented from leaking copper powder by bringing the first electric field uniformizing layer 12, the copper outflow preventing plate 211, the conductor crimp sleeve 1P, and the second electric field uniformizing layer 212 into close contact with each other. Can be.
  • the pressing layer 213 is preferably supported on the second field homogenization layer 212 in a gap winding in consideration of bending characteristics. That is, the pressure layer 213 may be formed by transversely winding the kraft paper in the longitudinal direction of the cable as an example.
  • the pressing layer 213 may be wound with insulating paper to relieve the electric field on the conductor crimp sleeve 1P, which takes a high electric field when the cable is energized.
  • the pressing layer 213 may have a volume resistance of 10 2 or more lower than that of the reinforcing insulating layer 2110.
  • FIG. 6 is a cross-sectional view illustrating in detail the first reinforcing insulating layer and the second reinforcing insulating layer of the intermediate junction box shown in FIG. 2.
  • each conductor of the DC power cables 100A and 100B is crimped and connected with a conductor crimp sleeve 1P to form a copper powder leakage preventing part PC, and then the conductors 11A and 11B.
  • the reinforcing insulation layer 210 is formed to surround at least a portion of the cable insulation layers 14A1, 14A2, and 14A3 including the connection portions of the layers.
  • the reinforcing insulating layer 210 may be formed of a field relaxation layer 214, a first reinforcing insulating layer 2101, and a second reinforcing insulating layer 2102.
  • the field relaxation layer 214 may be formed up to an outer diameter of the first insulating layer 14A1 of the cable 100A.
  • the first reinforcement insulating layer 2101 is formed on the field relaxation layer 214 up to the outer diameter of the third insulating layer 14A3 of the cable 100A, and may be formed of a first intermediate layer 2101B and a second intermediate layer 2101C. have.
  • the second reinforcement insulating layer 2102 may be formed on the first reinforcement insulating layer 2101. That is, the second reinforcement insulating layer 2102 may be stacked in the radial direction of the first reinforcement insulating layer 2101.
  • the second reinforcement insulating layer 2102 may be the outermost layer 2101D of the reinforcement insulating layer 210.
  • the interface length between the first reinforcing insulation layer 2101 and the cable insulation layer 14A may be increased by penciling the cable insulation layer 14A in multiple stages and forming an inclined surface at the end thereof. Can be. Furthermore, by reducing the angle of the inclined surface of each end of the cable insulation layer 14A, the interface length between the first reinforcing insulation layer 2101 and the cable insulation layer 14A can be further increased. As the interface length increases, the creeping electric field characteristics between the field relaxation layer 214, the first reinforcement insulating layer 2101, and the cable insulating layer 14A may be further improved.
  • the length of the intermediate junction box cannot be configured to be longer than the limit in accordance with the customer's requirements, specifications, or manufacturing cost.
  • Electric-field stress-control layer 214 is a volume resistivity than that of the first insulating layer 2101 may be less than 10 2 times.
  • the field relaxation layer 214 is formed to surround a portion where the conductors 11A and 11B of the two cables 100A and 100B connect to each other, and its volume resistivity is 10 to 2 times lower than that of the first reinforcement insulating layer 2101.
  • the electric field relaxation layer 214 having a low resistivity is formed at a portion to which the conductors 11A and 11B are connected to thereby relatively volume.
  • the electric field may be dispersed by the first reinforced insulating layer 2101 having a large resistance.
  • the height difference h2 between the maximum height t1 of the field relaxation layer 214 and the height h1 of the first cable insulation layer 14A1 is equal to or less than 430% of the height h1 of the first cable insulation layer 14A1. Can be.
  • the difference in height exceeds 430%, the outermost edge portion of the first reinforcement insulation portion 2101, that is, the interface between the first reinforcement insulation portion 2101 and the second insulation reinforcement portion 2102 is electric field concentrated and the edge Insulation breakdown may occur in the unit.
  • the height (or thickness) h1 of the first cable insulation layer 14A1 may be 1 to 10% of the total thickness of the cable insulation layer 14A.
  • the thickness t2 of the field relaxation layer 214 formed on the conductor crimp sleeve 1P may be 1.6 to 96% of the total thickness of the field relaxation layer 214.
  • the thickness t2 of the field relaxation layer 214 formed on the conductor crimp sleeve 1P is less than 1.6% of the total thickness of the field relaxation layer 214, the field relaxation layer 214 overlies the conductor crimp sleeve 1P.
  • the thickness t2 of the field relaxation layer 214 formed on the conductor compression sleeve 1P exceeds 96% of the total thickness of the field relaxation layer 214, the conductor compression sleeve 1P is relatively undistributed. ) Is too thin, the mechanical properties of the portion to which the conductors (11a, 11b) is connected may be lowered, which may not satisfy the allowable tensile strength level required for the cable.
  • the maximum height t1 of the field relaxation layer 214 may be approximately equal to the height of the first penciling end 14a1.
  • the electric field relaxation layer 214, the first reinforcing insulating layer 2101, and the second reinforcing insulating layer 2102 are insulating paper layers divided in the intermediate junction box radial direction because the insulating paper having a predetermined length is not continuous in the longitudinal direction.
  • the first reinforcement insulating layer 2101 and the second reinforcement insulating layer 2102 may be formed of a plurality of insulating paper layers. That is, it is supported by using an insulating paper roll wound with insulating paper having a predetermined length. When all the insulating paper having the predetermined length is wound, the process of winding the insulating paper again using a new insulating paper roll is repeated to form a plurality of insulating paper layers. do.
  • the insulating paper layer constitutes the electric field relaxation layer 214, the first reinforcement insulating layer 2101, and the second reinforcement insulating layer 2102, and the height of the field relaxation layer 214 and the height of the first penciling end. If is different from each other, it is difficult to precisely control the height of the plurality of insulating paper layers constituting the first reinforcing insulating layer 2101 and the second reinforcing insulating layer 2102.
  • the second reinforcement insulating layer 2102 may be made of a composite insulating paper having an excellent insulating strength compared to the insulating paper.
  • the second reinforcement insulating layer 2102 may be made of PPLP, which is a kind of composite insulating paper.
  • the second reinforcing insulating layer 2102 which is the outermost layer 2101D of the reinforcing insulating layer 210, may be formed of a straight portion 210A and a slope portion 210B.
  • the straight portion 210A is formed on the first reinforcing insulation layer 2101 formed on the conductor crimp sleeve 1P to the outer diameter of the cable insulation layer 14A and configured to be parallel to the longitudinal direction of the cable 100A. Can be.
  • the slope portion 210B may be formed so that the width in the longitudinal direction thereof becomes narrow in the radial direction of the cable 100A at both ends of the straight portion 210A.
  • the junction box outer semiconducting layer 230 formed by restoring the outer semiconducting layer 16 of the cable 14A is formed along the outer surface of the slope portion 210B of the second reinforcing insulation layer 2102 and has a second reinforcement. It may be formed to cover the straight portion 210A of the insulating layer 2102.
  • the junction box outer semiconducting layer 230 formed on the outer side of the slope portion 210B has a slope shape by itself, and an equipotential line continuous from the cable insulation layer 14A to the intermediate junction box 200 is slope-shaped. It may be distributed according to the geometric shape of the junction box outer semiconducting layer 230 having a. That is, the electric field distribution can be controlled according to the slope shape of the junction box outer semiconducting layer 230.
  • the first reinforcement insulating layer 2101 and the second reinforcement insulating layer 2102 may be formed of a plurality of insulating paper layers 212L.
  • the insulating paper layer 212L is formed by winding the insulating paper in the radial direction of the intermediate junction box 210, and each of the insulating paper layers 212L is not wound with the continuous insulating paper. That is, the insulating paper constituting the insulating paper layer 212L of the same layer is made of continuous insulating paper, but the insulating paper layer 212L of the other layer is not continuous.
  • the insulating paper layer 212L refers to a layer divided in the radial direction of the intermediate junction box 200 because the insulating paper having a predetermined width and length is not continuous in its length direction.
  • the first reinforcing insulating layer 2101 and the second reinforcing insulating layer 2102 are supported by using an insulating paper roll wrapped with insulating paper having a predetermined length. When all the insulating paper having the predetermined length is wound, a new insulating paper roll is again applied. Repeating the process of winding the insulating paper using the to form a plurality of insulating paper layer (212L). Since the reinforcing insulating layer 210 may be formed using insulating paper having different widths / lengths from each of the insulating paper layers 212L, the sizes of the first reinforcing insulating layer 2101 and the second reinforcing insulating layer 2102 may be formed. It can be configured in various ways.
  • the slope portion 210B at both ends of the second reinforcement insulating layer 2102 may be formed such that the slope of the slope portion 210B increases gradually toward the ends of the cable conductors 11A and 11B. That is, since insulator paper having different widths and lengths is used for each of the insulator paper layers 212L, the slope of the slope portion 210B can be precisely controlled.
  • a field shift layer 220 may be disposed between the slope portion 210B and the cable insulation layer 14A. As another example, the field shift layer 220 may be disposed on the slope portion 210B. ) And the cable insulation layer 14A, as well as between the straight portion 210A and the cable insulation layer 14A.
  • the electric field shift layer 220 may have a lower volume resistance than the second reinforcement insulating layer 2102 or the cable insulating layer 14A.
  • the electric field shift layer 220 may have a volume resistivity of 10 than the volume resistance of the PPLP. It may have a volume resistance of more than two times, and the electric field shift layer 220 may be made of kraft paper.
  • the intermediate junction box 210 is formed with slopes 210B on both sides of the second reinforced insulation layer 2102 to control an electric field applied continuously from the cable insulation layer 14A as described above, and the slope portion 210B.
  • the junction box outer semiconducting layer 230 formed by restoring the outer semiconducting layer 16 of the cable has a slope shape, thereby forming the junction box outer semiconducting layer 230 and the second reinforcing insulating layer 212.
  • the electric field inside the intermediate junction box 200 can be controlled by dispersing the equipotential lines continuous from the cable insulation layer 14A by the volume resistance difference between the junction box and the geometric shape of the junction box external semiconducting layer 230.
  • the intermediate junction box 200 provides the electric field shift layer 220 having a low volume resistance between the cable insulation layer 14A and the slope portion 210B of the second reinforcing insulation layer 2102.
  • the electric field in the slope part 210B of the 2nd reinforcement insulating layer 2102 which is an insulation weak part can be disperse
  • the electric field shift layer 220 may be formed on the cable insulation layer 14A or may be the outermost portion of the cable insulation layer 14A as part of the cable insulation layer 14A. That is, when the third cable insulation layer 14A3, which is the uppermost part of the cable insulation layer 14A, is made of kraft paper, the third cable insulation layer 14A3 may function as the electric field shift layer 220. In other words, an electric field shift layer made of kraft paper on the third cable insulation layer 14A3 located at the outermost part of the cable insulation layer 14A to prevent the high electric field from being applied directly under the metal sheath 22 of the cable.
  • the 220 it is preferable to be connected to the cable insulation layer 14A, and more preferably, the third cable insulation layer 14A3 of the cable insulation layer 14A is extended to the electric field shift layer 220. Can work.
  • the electric field shift layer 220 may be formed to have a thickness of 5 to 15% of the thickness of the cable insulation layer 14A. That is, the electric field shift layer 220 is formed by 5 to 15% of the thickness of the cable insulation layer 14A and extends beyond the slope portion 210B to the straight portion 210A (at least until the portion where the straight portion 210A starts). Extension), the electric field of the slope portion 210B can be shared by the straight portion 210A.
  • the reinforcement insulating layer 210 may be made of insulating paper and / or composite insulating paper as described above.
  • a predetermined space is provided between the conductor crimp sleeve 1P and the first cable insulation layer 14A1 located at the innermost side of the cable insulation layer 14A of the cable 100A. This may remain.
  • the space remaining between the crimp sleeve 1P and the first penciling end 14a1 located at the innermost side of the cable insulation layer 14 may be filled with the field relaxation layer 214 as described above.
  • the field relaxation layer 214 may be kraft paper.
  • the outer surface of the field relaxation layer 214 made of insulating paper of the reinforcing insulating layer 210 is approximately the same distance from the outermost surface of the first penciling end 14a1 and the longitudinal central axis of the cable. Will be located.
  • the outer surface of the compression sleeve (1P) may be surrounded by a semi-conductive tape in order to uniform the electric field distribution.
  • the electric field relaxation may be formed such that it is located approximately the same distance from the longitudinal central axis of the cable.
  • the outer surface of the electric field relaxation layer 214 made of insulating paper and the first penciling end 14a1 located at the innermost side of the multi-stage structure of the cable insulation layer 14A is about the same distance from the longitudinal central axis of the cable If a step occurs because it is not located at, the step where the step occurs acts as an electric field weakness and the electric field is concentrated to cause breakdown.
  • the outermost layer 2101D of the reinforcing insulating layer 210 is formed above the outer diameter of the exposed cable insulating layer 14A of the cable 100. Since the exposed conductor 11A of the cable is connected by the crimping sleeve 1P, not only the height of the conductor section is increased by the thickness of the crimping sleeve 1P but also a lot of heat is generated when the cable is energized. In addition, since the reinforcing insulating layer 210 is formed by winding a plurality of insulating papers or composite insulating papers and is relatively weak to insulation, the outermost layer 2101D of the reinforcing insulating layer 210 may have an outer diameter of the cable insulating layer 14A. It is necessary to form in the above and to reinforce insulation performance.
  • the outermost layer 2101D of the reinforcing insulating layer 210 is composed of a composite insulating paper having an excellent insulating strength compared to the insulating paper.
  • the electric field concentrated up to) may be distributed to the outermost layer 2101D of the reinforcing insulating layer 210.
  • intermediate layers 210B and 210C formed of a composite insulating paper layer may be provided between the field relaxation layer 214 and the outermost layer 2101D of the reinforcing insulating layer 210.
  • the intermediate layer of the reinforcing insulating layer 210 may include a first intermediate layer 2101B and a second intermediate layer 2101C sequentially from the inner side to the outer side between the field relaxation layer 214 and the outermost layer 2101D. have.
  • the field relaxation layer 214 is made of insulating paper, and the first intermediate layer 2101B, the second intermediate layer 2101C, and the outermost layer 2101D of the reinforcing insulating layer 210 are all made of composite insulating paper. Can be.
  • the field relaxation layer 214 is made of an insulating paper layer, and the first intermediate layer 2101B and the second intermediate layer 2101C are composed of composite insulating paper, the resistive electric field of the DC power cable in which the electric field is distributed according to the resistivity According to the distribution characteristic, the electric field is distributed more in the first intermediate layer 2101B and the second intermediate layer 2101C which are formed of a composite insulating paper having a relatively higher resistivity than kraft paper which is an insulating paper of the field relaxation layer 214.
  • the cable becomes relatively hot and the shrinkage / expansion of the insulating oil is relatively high, and thus bubbles are likely to occur, and the electric field that is distributed to the innermost layer 2101A, which is relatively vulnerable to insulation due to its large electric field strength, can be alleviated. As a result, the insulation performance of the intermediate junction box can be stabilized.
  • the reinforcement insulating layer 210 may include a first intermediate layer 2101B made of a composite insulating paper and a second intermediate layer 2101C made of an insulating paper.
  • the first intermediate layer 2101B and the second intermediate layer 210C provided between the field relaxation layer 214 and the outermost layer 2101D are respectively the second penciling end 14a2 and the third penciling end ( 14a3) may be disposed at the same distance from the center of the cable 100A.
  • the innermost layer 2101A of the reinforcing insulating layer 210 is made of an insulating paper layer
  • the first intermediate layer 2101B is made of a composite insulating paper
  • the electric field is distributed in the first intermediate layer 2101B formed of a composite insulating paper having a relatively higher resistivity than the kraft paper forming the field relaxation layer 214. Therefore, as the cable becomes relatively high temperature and contraction / expansion of the insulating oil is relatively active, bubbles are likely to occur, and the electric field distributed to the field relaxation layer 214, which is relatively vulnerable to insulation due to its large electric field strength, can be alleviated. Since the insulation performance can be stabilized.
  • the junction box outer semiconducting layer 230 may be formed on the outer surface of the slope portion 210B and the straight portion 210A of the second reinforcement insulating layer 2102.
  • the junction box outer semiconducting layer 230 may be energized with the outer semiconducting layer 16 to the metal sheath layer 22 of the cable 100.
  • the spacer 250 may be inserted outside the reinforcing insulating layer 210 through the through hole to maintain a gap between the copper tube 240 and the reinforcing insulating layer 210.
  • the spacer 250 has a through hole therein, and a plurality of recesses in the radial direction may be spaced apart from each other.
  • the insulating oil in the copper tube 240 passes through the recess. That is, the insulating oil injected into the copper tube 240 when the insulating oil is impregnated can smoothly move in the longitudinal direction of the intermediate junction box 200 through the recess. When there is no insulating oil passage such as the recess 251, the spacer 250 may move when the insulating oil is injected. In order to prevent the movement of the spacer 250, additional wires may be wound around the spacer 250 to fix the metal wire. Can be.
  • the spacer 250 may be formed of aluminum.
  • the protective copper tube 240 may protect the inside of the junction box from the outside, and may be energized with the metal sheath 22 of the cable 100 to serve as a passage for the accident current.

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Abstract

La présente invention concerne un système de jonction de câble d'alimentation en courant continu qui peut réduire une concentration de champ électrique au niveau d'une partie faiblement isolée dans une structure de jonction d'un câble d'alimentation en courant continu et une concentration de champ électrique entre des première et seconde couches d'isolation de renforcement constituant une couche d'isolation de renforcement.
PCT/KR2017/003608 2017-03-31 2017-03-31 Système de jonction de câble d'alimentation en courant continu WO2018182080A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/KR2017/003608 WO2018182080A1 (fr) 2017-03-31 2017-03-31 Système de jonction de câble d'alimentation en courant continu

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Application Number Priority Date Filing Date Title
PCT/KR2017/003608 WO2018182080A1 (fr) 2017-03-31 2017-03-31 Système de jonction de câble d'alimentation en courant continu

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WO2018182080A1 true WO2018182080A1 (fr) 2018-10-04

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115149343A (zh) * 2022-07-25 2022-10-04 巢湖市金鸿电缆有限公司 一种铜制电缆连接件

Citations (5)

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JPH08251791A (ja) * 1995-03-06 1996-09-27 Sumitomo Electric Ind Ltd プラスチック電力ケーブル用終端接続箱
JPH1079205A (ja) * 1996-09-04 1998-03-24 Fujikura Ltd 電力ケーブルおよび電力機器
JPH1141779A (ja) * 1997-07-18 1999-02-12 Furukawa Electric Co Ltd:The 架橋ポリエチレン絶縁電力ケーブルの接続部
KR20160084920A (ko) * 2015-01-06 2016-07-15 엘에스전선 주식회사 중간접속함

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Publication number Priority date Publication date Assignee Title
JPH08107627A (ja) * 1994-02-10 1996-04-23 Kansai Electric Power Co Inc:The 直流ｏｆケーブル用接続部
JPH08251791A (ja) * 1995-03-06 1996-09-27 Sumitomo Electric Ind Ltd プラスチック電力ケーブル用終端接続箱
JPH1079205A (ja) * 1996-09-04 1998-03-24 Fujikura Ltd 電力ケーブルおよび電力機器
JPH1141779A (ja) * 1997-07-18 1999-02-12 Furukawa Electric Co Ltd:The 架橋ポリエチレン絶縁電力ケーブルの接続部
KR20160084920A (ko) * 2015-01-06 2016-07-15 엘에스전선 주식회사 중간접속함

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115149343A (zh) * 2022-07-25 2022-10-04 巢湖市金鸿电缆有限公司 一种铜制电缆连接件

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