WO2018182121A1 - Système de jonction de câbles d'alimentation en courant continu - Google Patents

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

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Publication number
WO2018182121A1
WO2018182121A1 PCT/KR2017/012514 KR2017012514W WO2018182121A1 WO 2018182121 A1 WO2018182121 A1 WO 2018182121A1 KR 2017012514 W KR2017012514 W KR 2017012514W WO 2018182121 A1 WO2018182121 A1 WO 2018182121A1
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Prior art keywords
layer
insulating
paper
cable
conductor
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PCT/KR2017/012514
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English (en)
Korean (ko)
Inventor
채병하
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엘에스전선 주식회사
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Publication of WO2018182121A1 publication Critical patent/WO2018182121A1/fr

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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/10—Cable junctions protected by boxes, e.g. by distribution, connection or junction boxes
    • 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
    • H01B7/0208—Cables with several layers of insulating material
    • 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
    • H01B9/027—Power cables with screens or conductive layers, e.g. for avoiding large potential gradients composed of semi-conducting layers

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 a overhead transmission 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 wound while winding the insulating paper, that is, applying insulating oil between the insulating papers, and then restoring the external semiconducting layer, the metal sheath, and the like.
  • the inclined surface has to be inclined at the end thereof so as to secure a sufficient interface length.
  • each end of the cable insulation layer may be exposed to have an inclined surface, and both ends of the junction box insulation layer restored to the intermediate junction may be formed to have an inclined surface to correspond to each end of the cable insulation layer.
  • the interface between the cable insulating layer and the insulating layer restored to the intermediate junction has a great influence on the insulation performance of the intermediate junction, so it needs to be formed precisely.
  • the geometric shape of the insulating layer restored to the intermediate junction box is closely related to the electric field control acting on the intermediate junction box. It is necessary to precisely control and form the geometric shape of the insulating layer restored to the box.
  • An object of the present invention is to provide a DC power cable intermediate connection system capable of precisely controlling the shape of both ends of the intermediate junction box.
  • 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 connection part for electrically and mechanically connecting the exposed pair of conductors; A first reinforcing insulating layer wound around the conductor connecting portion, the exposed inner semiconducting layer and the cable insulating layer, and formed up to an outer diameter of the cable insulating layer, and having a sloped surface at both ends in the longitudinal direction, and the first reinforcing layer A straight line portion surrounding the exposed insulation layer and the exposed cable insulation layer and having a constant width in the longitudinal direction of the cable and a slope portion having a width in the longitudinal direction of the cable reduced in the radial direction of the cable are formed at both ends.
  • a reinforcing insulating layer including a second reinforcing insulating layer provided; And a junction box outer semiconducting layer formed along an outer surface of the slope portion of the second reinforcing insulating layer and having a slope shape by itself, and made of a semiconductive material, wherein the first reinforcing insulating layer and the second reinforcing insulating layer are provided.
  • each of the insulating paper layers having a smaller outer diameter than the insulating paper layer forming the outermost layer of the plurality of insulating paper layers of the second reinforcement insulating layer may include at least one narrow paper winding part and a wide paper winding part.
  • the narrow paper winding portion is formed so that the insulating paper is transversely wound so as to overlap or spaced apart in the longitudinal direction of the cable in the same narrow paper winding portion, it may be laminated in the radial direction of the cable.
  • each of the insulating paper layers having a smaller outer diameter than the insulating paper layer forming the outermost layer among the plurality of insulating paper layers of the second reinforcing insulating layer may have both sides of the narrow paper winding part in contact with the wide paper winding part.
  • Each of the insulating paper layers having a larger outer diameter than the insulating paper layer forming the innermost layer of the plurality of insulating paper layers of the first reinforcing insulating layer may include at least one narrow paper winding part and a wide paper winding part.
  • the cable insulation layer has a slope-shaped end portion
  • the first reinforcement insulation layer has an inclined surface corresponding to the slope-shaped end portion
  • the inclined surface is the outside of the narrow paper winding portion It may be made of sides.
  • the cable insulation layer has a slope-shaped end portion is a multi-stage slope shape
  • the first reinforcing insulation layer has a plurality of inclined surfaces corresponding to the end of the slope shape, each of the plurality of inclined surfaces are three It may be made of the outer surface of the winding winding portion.
  • the plurality of insulating paper layers having a smaller outer diameter than the insulating paper layer forming the outermost layer of the second reinforcing insulating layer and having a larger outer diameter than the insulating paper layer forming the outermost layer of the first reinforcing insulating layer.
  • Each of the two insulating paper layers has a butt portion formed by an interface formed by contacting different wide-width winding portions in the same insulating paper layer, and the butt portion of the butt-paper portion in the same insulating paper layer has the same number of narrow paper winding portions. It may be less than or equal to the number.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer may be made of only a narrow paper winding.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer may have a smaller volume resistivity than the insulating paper layer in contact with the insulating paper layer.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer may be made of kraft paper.
  • the narrow paper winding portion of the second reinforcing insulating layer may be located on the straight portion instead of the slope portion.
  • the narrow paper winding portion of the first reinforcing insulating layer or the second reinforcing insulating layer is composed of a single narrow paper region or a heterogeneous narrow paper region, and the single narrow paper region is the width of the narrow paper winding portion.
  • the predetermined narrow width may be a section that is supported, and the heterogeneous narrow section may be a section that is supported by two or more narrow widths having different widths among the narrow section windings.
  • the copper powder leakage preventing unit disposed between the conductor pressing sleeve and the conductor, copper powder leakage preventing plate made of a metal or alloy of the same series as the conductor;
  • a first electric field uniformity layer disposed between the conductor crimp sleeve and the conductor or between the reinforcement insulating layer and the conductor, and formed by transversely winding a semiconductive tape so as to overlap in the longitudinal direction of the cable at a portion in contact with the conductor;
  • a second field uniformity layer disposed between the reinforcement insulating layer and the conductor crimp sleeve, or between the reinforcement insulation layer and the first field uniformity layer.
  • 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 may be disposed between the conductors and may be disposed beyond the pleated acid.
  • 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 leakage preventing part overlaps the end of the copper powder leakage preventing plate and the first electric field uniformity layer between the one end of the conductor crimp sleeve and the vertex of the corrugated acid formed on one end of the conductor crimp sleeve.
  • the slope-type interface between the cable insulation layer and the first reinforcement insulation layer can be precisely formed, and the slope portion of the second reinforcement insulation layer can be precisely controlled to improve the insulation performance of the intermediate junction box. have.
  • 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 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. 4 is an enlarged view of a portion C of FIG. 2.
  • FIG. 5 is a cross-sectional view showing a conductor crimp sleeve after crimping.
  • FIG. 6 is a cross-sectional view schematically illustrating the intermediate junction box shown in FIG. 2.
  • 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 direct current 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 even more preferable to use lead alloys.
  • 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 and 3 is a partial cutaway view schematically showing an intermediate junction box according to the present invention and a DC power cable intermediate connection system connecting a pair of power cables using the same.
  • 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.
  • the pair of DC power cables 100A in which the conductor 11a, the inner semiconducting layer 12, the cable insulation layer 14, and the outer semiconducting layer 16 are sequentially exposed.
  • End portions 100B facing each other a conductor connecting portion connecting the ends of the pair of conductors 11a and 11b to each other, a reinforcing insulating layer 210 formed to surround the conductor connecting portion, and the reinforcing insulating layer.
  • An intermediate junction box is formed to surround and includes an junction box outer semiconducting layer 230 that is electrically connected to the outer semiconducting layer 16 to the metal sheath 22 of the cable.
  • the conductor connecting portion electrically and mechanically connects the exposed pair of conductors, and uses a conductor crimp sleeve 1P to grip and connect the pair of conductor ends, or between the pair of conductor ends.
  • Filler metal can be filled and connected.
  • the conductor crimp sleeve 1P fixes the ends of the pair of conductors 11a and 11b to each other so that the pair of conductors are mutually connected even if tension is applied when the power cable to the power cable intermediate connection system are laid. Strongly support the electrically connected state.
  • the conductor crimp sleeve 1P the conductor crimp sleeve may be inserted into each end of the exposed pair of conductors 11a and 11b, and then the outer surface of the conductor crimp sleeve may be crimped.
  • the said conductor connection part can be formed by crimping an outer surface, and performing a machining process, such as grinding, to make an outer surface smooth.
  • the conductor crimp sleeve may be a copper crimp sleeve whose outer diameter after the crimp is approximately similar to that of the exposed pair of conductors 11a and 11b.
  • the filler metal is larger than the diameter of the conductors 11a and 11b by using a bonding process such as brazing or arc welding between a pair of conductor ends provided with diagonally cut ends facing each other. ) Can be melted and machined such as grinding to fill between the pair of conductor ends.
  • the conductor connecting portion has an approximately the same outer diameter as the cable conductor, so that the reinforcing insulating layer is formed on the conductor connecting portion. The thickness can be reduced.
  • the conductor connecting portion is formed to connect the conductors 11a and 11b of the insulating oil impregnated cable 100A and 100B, and then a reinforcing insulating layer 210 covering at least a portion of the cable insulating layer 14A including the conductor connecting portion is formed.
  • the current flowing through the conductor and the conductor connecting portion flows only in the longitudinal direction of the intermediate connecting system and prevents leakage in the radial direction.
  • the cable insulation layer 14A may be exposed by being penciled to have a multi-stage structure.
  • the cable insulation layer 14A may have a multi-stage structure of a first fencing stage 14A1, a second fencing stage 14A2, and a third fencing stage 14A3. It can be penciled to have.
  • the first penciling end 14A1 may have the first cable insulation.
  • the third cable insulating layer is a portion of the second cable insulation layer.
  • the reinforcing insulating layer 210 may be formed by winding insulating paper to surround the conductor connecting portion, the exposed inner semiconducting layer or the cable insulating layer, and the insulating paper forming the reinforcing insulating layer 210 has excellent insulating strength.
  • the composite insulating paper may further include an insulating paper having a lower volume resistivity than the composite insulating paper, for example, kraft paper, so that electric field control may be performed using a difference in volume resistivity between the composite insulating paper and the kraft paper.
  • the insulating paper is preferably impregnated with insulating oil.
  • the reinforcement insulating layer 210 may include a first reinforcement insulating layer 2101 and a first reinforcement formed by winding insulating paper to surround the conductor connecting portion, the exposed inner semiconducting layer or the cable insulating layer.
  • the insulating layer 2101 and the second reinforcing insulating layer 2102 formed to surround the first reinforcing insulating layer may be formed.
  • the second reinforcement insulating layer 2102 is formed to surround the first reinforcement insulating layer 2101 and the exposed cable insulating layer 14A. That is, the second reinforcement insulating layer 2102 is formed above the outer diameter of the cable insulating layer to improve the insulation performance of the intermediate junction box.
  • the second reinforcement insulating layer 2102 has a straight portion 2102A having a width in the cable longitudinal direction that is constant in the radial direction of the cable, and is formed at both ends of the straight portion, and the width of the second reinforcement insulating layer 2102 is in the cable length direction. It may have a slope portion 2102B which decreases in the radial direction of the cable.
  • the slope portion 2102B is formed at both ends of the straight portion 2102A and serves to control the electric field by determining the shape of the junction box outer semiconducting layer 230 to be described later.
  • the width in the longitudinal direction of the cable is formed to decrease in the radial direction of the cable so that the thickness of the slope portion becomes thicker from the end of the cable side toward the end of the straight portion side.
  • the increase rate of the thickness may be increased, and in this case, the slope part may have an outer surface formed as a curved surface. That is, the slope portion 210B may be formed such that the slope of the outer surface of the slope portion increases gradually toward the end direction of the cable conductors 11a and 11b.
  • the second reinforcement insulating layer 2102 may be formed of a plurality of insulating paper layers 2102L stacked in a radial direction, and the insulating paper layer 2102L may be wound with insulating paper to cover the cable to the middle. It can be formed by laminating insulating paper in the radial direction of the junction box.
  • the plurality of insulating paper layers 2102L means that the insulating paper having a predetermined length is not formed in the length direction of the insulating paper so that the insulating paper layer is formed of the insulating paper layer divided in the radial direction of the cable to the intermediate junction box.
  • an insulating paper layer having a predetermined length may form one insulating paper layer using one of the insulating paper rolls wound in the longitudinal direction of the insulating paper, and when all the insulating paper having the predetermined length is wound, new insulating paper is again used. The process of forming another insulating paper layer by winding insulating paper using a roll is repeated, and a plurality of insulating paper layers are formed using a plurality of insulating paper rolls.
  • each of the insulating paper layers 2102L is divided in the radial direction of the cable to the intermediate junction bar because the wound insulating paper is not continuous.
  • the one sheet of insulating paper roll may have an insulating paper having a substantially trapezoidal shape in which the width of the insulating paper roll is narrowed or large, and the insulating paper forming each of the plurality of insulating paper rolls may have a different rate of change of the width or length of the insulating paper. Can be. That is, since the plurality of insulating paper layers 2102L are formed using insulating paper having various shapes, the shape of the second reinforcing insulating layer 2102, particularly the shape of the slope portion 2102B, can be precisely controlled.
  • the second reinforcement insulating layer 2102 may include a plurality of insulating paper windings W and N which are separated from each other because the insulating paper is not continuous in the longitudinal direction of the cable or the junction box in the same insulating paper layer. That is, one insulating paper layer 2102L may be divided into a plurality of insulating paper windings W and N in the longitudinal direction of the cable. In the second reinforcement insulating layer 2102 including insulating paper impregnated with insulating oil, the plurality of insulating paper windings W and N serve as an insulating oil flow path.
  • the insulating oil when the insulating paper is a composite insulating paper containing a plastic film, the insulating oil does not flow through the plastic film, the insulating oil may flow between the plurality of insulating paper winding when the insulating oil impregnated to expand the insulating oil by heat.
  • the insulating paper winding portion (W, N) may be in contact with the other insulating paper winding portion on at least one of the upper surface, the lower surface to the side.
  • the insulating paper winding portion may be in contact with the insulating paper winding portion of the other insulating paper layer from the upper surface to the lower surface, or may be in contact with other insulating paper winding portion of the same insulating paper layer from the side.
  • an insulated paper winding part of which an insulated paper winding part constitutes the same layer especially an insulated paper winding having a significantly smaller width than that of the insulated paper winding part which is in contact with the side, is wound in the longitudinal direction and the radial direction of the cable.
  • the insulating paper winding portion may be defined as narrow paper winding portion (N), including an insulating paper having a significantly larger width than the insulating paper forming the narrow paper winding portion (N).
  • the insulated paper winding portion may be defined as the wide paper winding portion (W).
  • the second reinforcement insulating layer 2102 may include the narrow winding portion N and the wide winding portion W to precisely implement the shape of the slope portion 2102B.
  • each of the insulating paper layers having a smaller outer diameter than the insulating paper layer forming the outermost layer of the second reinforcing insulating layer among the plurality of insulating paper layers constituting the second reinforcing insulating layer 2102 is at least one of the wide-wound winding W;
  • One or more narrow paper winding parts N may be formed to precisely implement the shape of the slope part 2102B of the second reinforcement insulating layer 2102.
  • the winding part N can be formed.
  • the wide paper winding portion W may form an insulated paper winding portion having a predetermined shape by winding a wide trapezoidal shape, particularly an insulated paper winding portion having a predetermined slope so that an outer surface of the slope surface has a predetermined slope. . Therefore, it is excellent in workability and can form the slope part 2102B by winding the said wide paper, and can control the external shape of the slope part 2102B precisely.
  • the insulating paper winding portion having a predetermined shape may not be formed in the empty space formed between the wide paper winding portions W. Therefore, it is preferable to form the narrow paper winding portion N by winding the narrow paper horizontally and winding in the longitudinal direction and the radial direction of the cable in the empty space formed between the wide paper winding portions W. That is, the narrow paper winding portion N formed between the wide paper winding portions W forming the insulating paper winding portion of a predetermined shape is transversely wound so that a small width of the insulating paper overlaps or is spaced in the longitudinal direction of the cable.
  • the narrow paper winding portion (N) is formed by winding an insulating paper having a relatively smaller width than that of a wide paper paper in the longitudinal and radial directions of the intermediate junction box, and has a large gap between the insulating paper wound in the longitudinal direction. It is concentrated.
  • the gap is likely to act as a gap that can be the point of breakdown, and when the gap is dense, there is a risk of electric field distortion due to a local volume resistivity change may act as an insulation weakening. Therefore, it is preferable that the narrow paper winding portion N is formed only in the straight portion 2102A in which the insulation paper is relatively thickly wound, not the slope portion 2102B.
  • each insulating paper layer of the slope part 2102B may be formed of one wide paper winding part (W). That is, the butt portion C, in which the wide paper winding portion W and the wide paper winding portion W contacting each other, may not be formed in the slope portion 2102B, and the wide paper forming the slope portion 2102B may be formed.
  • the winding part W may extend to the straight portion 2102A of the second reinforcing insulating layer 2102.
  • the narrow paper winding portion N may precisely form the shape of the second reinforcement insulating layer, but may act as an insulating weakening portion. Accordingly, each of the insulating paper layers 2102L of the second reinforcement insulating layer 2102 may have the number of narrow paper winding portions N less than or equal to the butt portion C, thereby minimizing the number of narrow paper winding portions.
  • the butt portion C means an interface where different wide-area winding portions W contact each other in the same insulating tooth layer 2102L.
  • the number of narrow paper winding portions N may not be equal to or less than the number of butt portions C.
  • the insulating paper layer is formed only by the wide paper winding part W, or two wide paper winding parts W and not including butt parts are formed. It may include only one narrow paper winding portion (N) formed between the two wide paper winding portion.
  • each of the insulating paper layers having an outer diameter smaller than the outermost insulating paper layer of the second reinforcing insulating layer 2102 and having a larger outer diameter than the outermost insulating paper layer of the first reinforcing insulating layer 2102 may be formed in the same insulating paper layer.
  • the number of narrow paper winding portions may be less than or equal to the number of butt portions in the same insulating paper layer.
  • the insulation performance of the second reinforcing insulation layer 2102 may be improved by forming the insulation paper layer 2102L with a minimum width of the narrow paper winding portion N, which is relatively weak to insulation, compared to the wide paper winding portion W. have.
  • the first reinforcing insulating layer 2101 is formed by winding insulating paper to surround the conductor connecting portion, the exposed inner semiconducting layer and the cable insulating layer, and formed to the outer diameter of the cable insulating layer. Specifically, the first reinforcing insulating layer 2101 is rolled up the insulating paper in the space between the cable insulating layer exposed from the pair of cables provided to face each other, wound the insulating paper in the longitudinal direction of the cable and insulated in the radial direction It can form by laminating
  • the first reinforcement insulating layer 2101 may be formed of a plurality of insulating paper layers 2102L stacked in a radial direction, and the insulating paper layer 2102L may be wound with insulating paper to cover the cable to the middle. It can be formed by laminating insulating paper in the radial direction of the junction box.
  • the first reinforcement insulating layer 2101 may include a plurality of insulating paper windings W and N separated from each other because the insulating paper is not continuous in the longitudinal direction of the cable or the junction box in the same insulating paper layer.
  • the reinforcing insulating layer 2102 may include the narrow winding portion N and the wide winding portion W to precisely implement the shape of the slope portion 2102B.
  • one insulating paper layer 2102L may be divided into a plurality of insulating paper windings W and N in the longitudinal direction of the cable.
  • the plurality of insulating paper winding parts W and N serve as an insulating oil flow path.
  • the insulating paper is a composite insulating paper containing a plastic film
  • the insulating oil does not flow through the plastic film
  • the insulating oil may flow between the plurality of insulating paper winding when the insulating oil impregnated to expand the insulating oil by heat.
  • the insulating paper windings W and N may be in contact with another insulating paper winding at at least one of an upper surface, a lower surface and a side surface thereof.
  • the insulating paper winding portion may be in contact with the insulating paper winding portion of the other insulating paper layer from the upper surface to the lower surface, or may be in contact with other insulating paper winding portion of the same insulating paper layer from the side.
  • an insulated paper winding part of which an insulated paper winding part constitutes the same layer especially an insulated paper winding having a significantly smaller width than that of the insulated paper winding part which is in contact with the side, is wound in the longitudinal direction and the radial direction of the cable.
  • the insulating paper winding portion may be defined as narrow paper winding portion (N), including an insulating paper having a significantly larger width than the insulating paper forming the narrow paper winding portion (N).
  • the insulated paper winding portion may be defined as the wide paper winding portion (W).
  • the first reinforcement insulating layer 2102 may include the narrow winding portion N and the wide winding portion W to precisely implement the shape of the slope portion 2102B. Particularly, among the plurality of insulating paper layers constituting the first reinforcing insulating layer 2102, each of the insulating paper layers having a larger outer diameter than the insulating paper layer forming the innermost layer of the first reinforcing insulating layer 2 may be at least one of the wide winding portions W and at least one of the insulating paper layers. One or more narrow paper windings N may be formed to precisely shape the slope portion 2102B of the first reinforcement insulating layer 2102.
  • the first reinforcement insulating layer 2101 may have inclined surfaces S at both ends in the longitudinal direction. Since the first reinforcing insulating layer 2101 is formed in a space between the exposed cable insulating layers of the pair of cables provided to face each other, both ends of the first reinforcing insulating layer 2101 in the longitudinal direction are exposed. If the end portion of the cable insulation layer has a slope shape may be formed to correspond thereto. As shown in FIGS. 2 and 3, when the end of the cable insulation layer has a multi-step slope shape, a plurality of inclined surfaces S are formed at the end of the first reinforcing insulation layer 2101 to correspond to the multi-stage slope shape of the cable insulation layer. Since the interface length between the first reinforcing insulating layer 2101 and the cable insulating layer 14A can be increased, the insulating performance is improved.
  • the inclined surface (S) is an insulation weakness having a good insulation performance, it is necessary to reinforce the insulation performance by winding the insulation paper with a strong tension. At this time, if the inclined surface is formed by applying a strong tension to the wide insulating paper, there is a fear that wrinkles may occur in the wide insulating paper. Therefore, it is preferable to form a narrow paper winding portion made of narrow insulating paper, and to wind the insulating paper with a strong tension.
  • the first reinforcing insulating layer 2101 may be spaced apart from the slope-shaped end of the cable by a predetermined distance to form the wide winding portion, and the narrow winding portion may be formed in the space. That is, it is preferable that the inclined surface S of the first reinforcing insulating layer having a shape corresponding to the slope-shaped end of the cable is formed of the outer surface of the narrow paper winding portion.
  • the wide paper winding portion can form an insulating paper winding portion of a predetermined shape as described above has the advantage of excellent workability.
  • the insulating paper winding portion having a predetermined shape is formed in the empty space between the inclined surface S and the wide paper winding portion spaced apart from the inclined surface S by a predetermined distance. Difficult to do Therefore, it is preferable to form the narrow paper winding part N by winding a narrow paper horizontally in the said empty space and winding in the longitudinal direction and the radial direction of the said cable.
  • the narrow paper winding portion (N) is formed by winding in a radial direction so that the width of the insulating paper is overlapping or spaced apart in the longitudinal direction of the cable bar, adjusting the area where the small width of the insulating paper overlaps or spaced apart
  • a narrow paper winding portion may be formed in an empty space between the wide paper winding portion formed by being spaced apart from the inclined surface S by a predetermined distance. 2 to 3, when the first reinforcing insulating layer includes a plurality of inclined surfaces, the narrow paper windings are formed on each of the plurality of inclined surfaces.
  • the wide paper winding is formed by winding the wide paper, the workability is excellent, and the narrow paper winding which is significantly smaller in width than the wide paper is formed on the inclined surface by forming the narrow paper winding in the longitudinal and radial directions of the cable.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer of the plurality of insulating paper layers constituting the first reinforcing insulating layer 2102 may be formed of only a narrow paper winding part.
  • the insulating paper layer constituting the innermost layer of the first reinforcement insulating layer is formed at a close distance to the conductor connecting portion, and the conductor connecting portion has a non-smooth surface or a stepped portion in the process of connecting a pair of conductors to each other. Can be.
  • the conductor connecting portion includes a conductor crimping sleeve
  • the conductor crimping sleeve may have a thickness greater than or equal to a certain level in order to reinforce the mechanical performance of the conductor connecting portion. May occur.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer is formed only of the narrow paper winding part.
  • the narrow paper winding part may act as a weak insulation as described above.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer which is a portion to which a high electric field is applied when the cable is energized, is formed with only the narrow paper winding portion, there is a possibility that the insulation performance is lowered. Therefore, the insulating paper layer forming the innermost layer of the first reinforcing insulating layer is preferably smaller in volume resistivity than other insulating paper layers in contact with the insulating paper layer.
  • the insulating paper layer forming the innermost layer of the first reinforcing insulating layer is formed of kraft paper, and the other insulating paper layer in contact with the first reinforcing insulating layer is formed of composite insulating paper.
  • the narrow paper windings of the first to second reinforced insulating layers may be composed of a single narrow zone and / or a heterogeneous narrow zone.
  • the single narrow paper section is a section that is designated as a narrow width of a narrow width winding section (N)
  • the heterogeneous narrow paper section is a section that is designated as two or more width sheets having different widths.
  • the conductors in the cable are heated to reduce the viscosity of the insulating oil in the cable, so that copper powders between the conductor wires may move in the direction of gravity. Copper powder moving in the direction of gravity may flow out of the reinforcing insulating layer, and in particular, breakdown occurs in the copper powder flowing out of the insulating paper layer forming the innermost layer of the first reinforcing insulating layer composed of narrow paper windings only. There is this.
  • the conductor connecting portion may further include a copper powder leakage preventing part PC for preventing copper from flowing out of the conductor, and the copper powder leakage preventing part PC may be formed between the reinforcing insulating layer and the conductor.
  • a copper powder leakage preventing part PC for preventing copper from flowing out of the conductor
  • the copper powder leakage preventing part PC may be formed between the reinforcing insulating layer and the conductor.
  • Can be. 4 and 5 will be described in detail with respect to the copper powder leakage prevention unit (PC).
  • the copper powder leakage preventing part is disposed between the conductor pressing sleeve and the conductor described above, and the copper powder leakage preventing plate 211 made of the same metal or alloy as the conductor, and between the conductor pressing sleeve and the conductor.
  • a portion between the reinforcing insulation layer and the conductor and in contact with the conductor is formed by transversely winding a semiconductive tape so as to overlap in the longitudinal direction of the cable, and the first field uniformity layer 212 and the reinforcing insulation layer and the conductor crimping.
  • a second field uniformity layer 213 disposed between the sleeve or between the reinforcing insulation layer and the first field uniformity layer.
  • the conductor crimp sleeve 1P is crimped to grip a pair of conductors. Therefore, it may include at least two wrinkles (1Pa 'and the body portion having at least one wrinkled bone (1Pb') formed between the wrinkles formed by protruding from the inner surface by the compression, the highest place in the wrinkles It can be defined as a ridge (T).
  • the copper powder leakage preventing plate 211 may be disposed between the conductor pressing sleeve 1P and the conductors 11A and 11B. That is, the copper powder leakage preventing plate 211 may be disposed inside the conductor compression sleeve 1P and may not exceed the end of the conductor compression sleeve 1P. As another example, the copper flux release plate may extend not only between the conductor pressing sleeve 1P and the conductor 11A but also beyond both ends of the conductor pressing sleeve 1P.
  • the copper powder leakage preventing plate 211 may be formed of a material having a structure that is dense so that copper powder cannot 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 tape may be terminated and soldered. When both ends of the copper tape are soldered to form the copper leakage preventing plate 211, it is preferable that the soldered portion is smoothed 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. Therefore, the copper powder may be blocked by the copper powder leakage preventing plate 211.
  • the copper powder leakage preventing plate 211 facing the end of the cable conductor 11A is adjacent to the corrugated bone 1Pb 'beyond the corrugated mountain 1Pa' formed on the inner side thereof by crimping the conductor crimp sleeve 1P.
  • a compressive force can be received from the conductor crimp sleeve 1P.
  • 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.
  • the first field homogenization layer 212 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 212 may extend not only between the first reinforcing insulation layer 2101 and the conductor 11A but also extend between the conductor crimp sleeve 1P and the conductor 11A, and the wrinkles It may extend to just before the highest ridge T in the mountain (1Pa 'in FIG. 5). This extension ensures a sufficient current path between the conductor 11A of the cable and the conductor crimp sleeve 1Pa.
  • the first field homogenization layer 212 may be formed by, for example, an internal semiconducting layer of the cable 100A. That is, the first electric field uniformization layer 212 may be formed as the internal semiconducting layer itself of the cable 100A, and may be formed without being removed together with the cable insulation layer, leaving a predetermined length. After this removal, the conductor 11A is exposed.
  • the first field homogenization layer 212 may be formed of a semiconducting tape to play the same role as the inner semiconducting layer of the above-described cable, and at the same time, the semiconductive tape is in the longitudinal direction of the cable in contact with the conductor. It can be transversely so that it may overlap and the said powder may be prevented from leaking.
  • At least one semiconducting tape is formed on the conductor 11A by lapping, that is, one semiconducting sheet, in the longitudinal direction of the DC power cables 100A and 100B to be transversely wound.
  • lapping that is, one semiconducting sheet
  • the copper powder leakage preventing plate 211 and the first electric field uniformity layer 212 may overlap each other in the pleated acid T of the conductor compression sleeve, and preferably, one end of the conductor compression sleeve and the conductor compression may be overlapped.
  • the corrugated acid formed on one end side of the sleeve may overlap each other between the ridges T of 1 Pa ', and more preferably, one end of the conductor crimp sleeve and one end of the conductor crimp sleeve.
  • An end portion of the copper flux leakage preventing plate 211 and the first electric field uniformization layer 212 may overlap between the ridges T.
  • the first electric field uniformization layer 212 is a ridge of the corrugated acid ( It is formed to extend to just before the T) to ensure a sufficient current path
  • the end of the first electric field homogenization layer and the copper powder leakage preventing plate 211 is one end of the conductor crimp sleeve and the conductor crimp One end side of the sleeve
  • the copper bleeding prevention plate 211, the first electric field homogenizing layer 212, and the conductor pressing sleeve 1P are overlapped with each other between the ridges T of the corrugated acid formed on the corrugated acid. ) And the conductor 11A are closely adhered to each other, thereby minimizing the flow path of copper powder.
  • the second field homogenization layer 213 is made of a semiconductive material, and between the first reinforcing insulation layer 2101A and the first field uniformity layer 212 to the first reinforcing insulation layer 2101A and the conductor. It is formed between the compression sleeves 1P.
  • the second electric field homogenization layer 213 equalizes the electric field acting on the outer surface by smoothing the outer surface of the conductor crimp sleeve which is uneven after being trimmed.
  • a semiconductive tape may be wound and formed, and the semiconducting tape may be formed of the copper flux leakage preventing plate 211, the first electric field homogenization layer 212, the conductor crimp sleeve 1P, and the conductor 11A. As it is pressurized and wound up, it can minimize the flow path of copper.
  • the junction box outer semiconducting layer 230 may be further formed.
  • the junction box outer semiconducting layer 230 is formed to surround the reinforcing insulating layer 210 and is energized with the outer semiconducting layer 16 to the metal sheath 22 of the cable.
  • the junction box outer semiconducting layer 230 is formed along the outer surface of the slope portion 2102B of the second reinforcement insulating layer 2102 and has a slope shape by itself. Continuous equipotential lines may be distributed according to the geometric shape of the junction box outer semiconducting layer 230 having a slope shape.
  • the junction box outer semiconducting layer 230 may have a lower volume resistance than the cable insulating layers 14A and 14B and the reinforcing insulating layer 210. That is, the electric field distribution may be controlled using the slope shape and the volume resistivity of the junction box external semiconducting layer 230.
  • the junction box outer semiconducting layer 230 may be formed by winding a semiconducting tape on the outer surface of the slope portion 2102B of the second reinforcement insulating layer, and may be energized with the outer semiconducting layer 16 of the cable.
  • the second reinforcement insulating layer 2102 may be formed to surround the straight portion 2102A.
  • the metal shielding layer which is energized with the metal sheath 22 of the cable 100A is restored on the reinforcing insulating layer 210, and the spacer 250 and the protective copper tube 240 are covered.
  • the metal shielding layer is formed to surround the slope portion 2102B and the straight portion 2102A and the junction box outer semiconducting layer 230 of the second reinforcement insulating layer.
  • the metal shielding layer formed to surround the slope portion 2102B of the second reinforcement insulating layer is preferably formed of a metal wire.
  • the metal wire may be a copper wire, a copper wire, a tin-plated copper wire, or the like, and may be formed by winding the metal wire to surround the slope portion 2102B or winding a braid made of the metal wire. Since the slope portion 2102B has a slope-shaped outer surface where the slope may not be constant, the junction outer semiconducting layer 230 and the metal shielding layer may be smoothly energized using the metal wire or braid. . In addition, since the insulating oil can penetrate between the metal wires, there is an advantage that the insulating oil impregnation to be described later is easy.
  • the intermediate junction box may include a metal shielding layer formed to surround the straight portion 2102A of the second reinforcing insulating layer, as shown in Figure 6, the metal shielding layer 250 is a metal tape to a metal plate Can be made.
  • the workability can be improved by attaching a metal plate to the straight portion 2102B of the second reinforcement insulating layer having a relatively smooth outer surface or by winding a metal tape.
  • the metal tape or the metal plate may be perforated to facilitate the impregnation of the insulating oil described later.
  • the spacer 250 may have a disk shape having a through hole therein, and may be formed of a metal material such as aluminum, and formed on a straight portion of the second reinforcement insulating layer. The spacer may be inserted outside the reinforcing insulating layer 210 through the through hole to maintain a gap between the copper tube 240 to be described later and the reinforcing insulating layer 210.
  • the spacer 250 may have a plurality of recesses 251 spaced apart from each other in the radial direction on the outer surface as shown in FIG. 6. The insulating oil in the copper tube 240 passes through the recess 251.
  • the insulating oil injected into the copper tube 240 when the insulating oil is impregnated can be smoothly moved in the longitudinal direction of the intermediate junction box 200 through the recess 251.
  • metal wires may be wound and fixed on both sides of the spacer 250.
  • a metal shielding layer protection part 270 may be further formed between the metal shielding layer 260 and the spacer 250.
  • the metal shielding layer protection unit 270 is formed by winding an insulating paper on the metal shielding layer 260, and may prevent the metal shielding layer 260 from being damaged by the spacer 250.
  • a scratch occurs on the surface of the metal shielding layer 260 formed on the reinforcing insulating layer 210, or a load of an intermediate junction box is applied.
  • the metal shielding layer 260 may be pressed by the spacer 250 to generate an edge portion.
  • the metal shielding layer protection part 270 is formed between the spacer 250 and the metal shielding layer to prevent the metal shielding layer 260 from being damaged by the spacer 250, and to prevent surface damage such as edge generation and the like. This can prevent electric field concentration.
  • 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.
  • the intermediate connection system needs to ensure insulating performance by lubricating insulating oil in the intermediate junction box. Specifically, when the insulating oil is filled in the space between the reinforcing insulating layer and the protective copper tube, and particularly when the reinforcing insulating layer is formed by winding anti-oil immersion, the reinforcing insulating layer is impregnated with the insulating oil to improve the insulating performance. There is a need.
  • the protective copper tube 240 of the present invention may be provided with an insulating oil inlet pipe and an insulating oil discharge pipe.
  • the inlet pipe and the discharge pipe are formed on the outer surface of the protective copper tube 240 in opposite directions, and serve as a passage through which the insulating oil moves.
  • the insulating oil supplied into the protective copper tube through the inlet pipe is discharged to the outside through the upper discharge pipe while impregnating the reinforcing insulating layer 210 through the junction box outer semiconducting layer and the metal shielding layer.
  • the reinforcement insulating layer may be smoothly impregnated to improve the insulating performance.

Landscapes

  • Gas Or Oil Filled Cable Accessories (AREA)

Abstract

La présente invention concerne un système de jonction de câbles d'alimentation en courant continu comprenant : une paire de câbles d'alimentation en courant continu, dont chacun comprend un conducteur, une couche semi-conductrice interne, une couche d'isolation de câble et une couche semi-conductrice externe ; et une boîte de jonction pour connecter la paire de câbles d'alimentation en courant continu l'un à l'autre. La paire de câbles d'alimentation en courant continu a des extrémités respectives formées pour se faire face, auxquelles les conducteurs, les couches semi-conductrices internes, les couches d'isolation de câble et les couches semi-conductrices externes respectifs sont successivement exposés. La boîte de jonction comprend : une partie de connexion de conducteurs connectant électriquement et mécaniquement une paire de conducteurs exposés ; une couche d'isolation de renforcement qui comprend une première couche d'isolation de renforcement et une seconde couche d'isolation de renforcement, la première couche d'isolation de renforcement ayant une feuille d'isolation enroulée sur celle-ci et entourant la partie de connexion de conducteurs, la couche semi-conductrice interne exposée, et la couche d'isolation de câble exposée, elle est formée jusqu'à la surface externe de la couche d'isolation de câble, et a des surfaces inclinées respectivement formées aux deux extrémités de celle-ci dans la direction longitudinale, et la seconde couche d'isolation de renforcement présente une partie en ligne droite entourant la première couche d'isolation de renforcement et la couche d'isolation de câble exposée et ayant une largeur constante dans la direction longitudinale d'un câble, et une partie inclinée formée à chacune des deux extrémités de la partie en ligne droite et ayant une largeur longitudinale décroissante du câble dans la direction radiale du câble ; et une couche semi-conductrice externe de boîte de jonction formée le long de la surface externe de la partie inclinée de la seconde couche d'isolation de renforcement et ayant ainsi elle-même une forme inclinée, et constituée d'un matériau semi-conducteur. Chacune de la première couche d'isolation de renforcement et de la seconde couche d'isolation de renforcement comprend de multiples couches de feuille d'isolation stratifiées dans la direction radiale. La première ou la seconde couche d'isolation de renforcement comprend : une partie de feuille large enroulée formée par enroulement d'une feuille large ; et une partie de feuille étroite enroulée qui est en contact avec la partie de feuille large enroulée et constituée d'une feuille d'isolation ayant une largeur plus étroite que celle de la partie de feuille large enroulée.
PCT/KR2017/012514 2017-03-31 2017-11-07 Système de jonction de câbles d'alimentation en courant continu WO2018182121A1 (fr)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60204215A (ja) * 1984-03-26 1985-10-15 住友電気工業株式会社 Ｏｆケ−ブルの接続部
JP2005353379A (ja) * 2004-06-09 2005-12-22 Sumitomo Electric Ind Ltd 超電導ケーブルの中間接続構造
WO2013157513A1 (fr) * 2012-04-19 2013-10-24 古河電気工業株式会社 Structure de connexion pour câble supraconducteur
KR101510791B1 (ko) * 2008-04-16 2015-04-10 넥쌍 두 개의 초전도체 케이블을 위한 연결장치
KR20150106639A (ko) * 2014-03-12 2015-09-22 엘에스전선 주식회사 종단접속함

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60204215A (ja) * 1984-03-26 1985-10-15 住友電気工業株式会社 Ｏｆケ−ブルの接続部
JP2005353379A (ja) * 2004-06-09 2005-12-22 Sumitomo Electric Ind Ltd 超電導ケーブルの中間接続構造
KR101510791B1 (ko) * 2008-04-16 2015-04-10 넥쌍 두 개의 초전도체 케이블을 위한 연결장치
WO2013157513A1 (fr) * 2012-04-19 2013-10-24 古河電気工業株式会社 Structure de connexion pour câble supraconducteur
KR20150106639A (ko) * 2014-03-12 2015-09-22 엘에스전선 주식회사 종단접속함

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