WO2020203788A1 - Partie de connexion intermédiaire d'un câble d'alimentation et procédé de construction - Google Patents

Partie de connexion intermédiaire d'un câble d'alimentation et procédé de construction Download PDF

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Publication number
WO2020203788A1
WO2020203788A1 PCT/JP2020/014066 JP2020014066W WO2020203788A1 WO 2020203788 A1 WO2020203788 A1 WO 2020203788A1 JP 2020014066 W JP2020014066 W JP 2020014066W WO 2020203788 A1 WO2020203788 A1 WO 2020203788A1
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Prior art keywords
layer
semi
power cable
conductive tape
connection portion
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PCT/JP2020/014066
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English (en)
Japanese (ja)
Inventor
櫻子 富井
直登 茂森
八木　正史
Original Assignee
古河電気工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 古河電気工業株式会社 filed Critical 古河電気工業株式会社
Priority to CN202080018749.2A priority Critical patent/CN113544924B/zh
Priority to JP2020547153A priority patent/JP6852231B2/ja
Publication of WO2020203788A1 publication Critical patent/WO2020203788A1/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
    • H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
    • 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

Definitions

  • the present invention relates to an intermediate connection portion of a power cable and a construction method thereof.
  • the two power cables are stripped off, the exposed conductors are connected to each other by a conductor connecting pipe, the conductor connecting pipe and the conductor are wrapped with a semi-conductive tape, and the conductor is connected.
  • a rubber block insulating cylinder provided with an internal semi-conductive layer on the outside of the portion and the insulating layers on both sides thereof (see, for example, Patent Document 1). Further, such a rubber block insulating cylinder is inserted into one of the power cables before being connected in advance, and after the conductors are connected to each other, it is slid to a position to cover the conductor connection portion or the like at an appropriate position. (See, for example, Patent Document 2).
  • the inner diameter of the rubber block insulating cylinder is set to be smaller than the outer diameter of the insulating layer of the power cable, and when mounted, it self-shrinks and adheres to the insulating layer of the power cable or the tape wound around the conductor connection portion. It has become like.
  • the rubber block insulating cylinder is slid with respect to the intermediate connection portion of the power cable of Patent Document 1 as in Patent Document 2, the end portion of the semi-conductive tape wound around the outer circumference of the conductor connection portion becomes rubber. There was a risk that it would be dragged by the block insulation cylinder and unraveled, resulting in a state of being sandwiched between the rubber block insulation cylinder and the insulating layer of the power cable. In that case, the electrical performance of the intermediate connection portion is deteriorated, and further, electric field concentration is generated at the end portion of the sandwiched semi-conductive tape, which may cause dielectric breakdown.
  • An object of the present invention is to suppress a decrease in electrical performance and to provide a highly reliable intermediate connection portion of a power cable and a method for constructing the intermediate connection portion.
  • the present invention is an intermediate connection portion of a power cable.
  • a conductor connection that connects the conductors exposed from the insulating layer of the two power cables,
  • a semi-conductive tape layer made of a semi-conductive tape formed on the outer periphery of the conductor connection portion,
  • a rubber block insulating cylinder provided on the outside of the conductor connecting portion and the semi-conductive tape layer, and
  • the outer periphery of the semi-conductive tape layer is provided with an outer layer made of a tape having a coefficient of dynamic friction with respect to the rubber block insulating cylinder lower than that of the semi-conductive tape.
  • the tape having a low coefficient of dynamic friction may be a semi-conductive cross-linked polyethylene tape having adhesiveness on one side.
  • the present invention is an intermediate connection portion of a power cable.
  • a conductor connection that connects the conductors exposed from the insulating layer of the two power cables,
  • a rubber block insulating cylinder provided on the outside of the conductor connecting portion and the semi-conductive tape layer, and
  • the outer periphery of the semi-conductive tape layer is provided with an outer layer made of a tape thinner than the semi-conductive tape.
  • the outer diameter of the outer layer may be smaller than the outer diameter of the insulating layer of the power cable. Further, in the intermediate connection portion, the outer diameter of the outer layer may be smaller than the outer diameter of the insulating layer of the power cable within a range of 5 [mm] or less, and further, the insulating layer of the power cable. It may be smaller than the outer diameter in the range of 0.4 [mm] or more and 1 [mm] or less.
  • the present invention is an intermediate connection portion of a power cable.
  • a conductor connection that connects the conductors exposed from the insulating layer of the two power cables,
  • a semi-conductive tape layer made of a semi-conductive tape formed on the outer periphery of the conductor connection portion,
  • a rubber block insulating cylinder provided on the outside of the conductor connecting portion and the semi-conductive tape layer, and
  • the outer diameter of the semi-conductive tape layer is smaller than the outer diameter of the insulating layer of the power cable.
  • the outer diameter of the semi-conductive tape layer of the intermediate connection portion may be smaller than the outer diameter of the insulating layer of the power cable within a range of 5 [mm] or less, and further, the insulating layer of the power cable. It may be smaller than the outer diameter in the range of 0.4 [mm] or more and 1 [mm] or less.
  • the rubber block insulating cylinder has a central hole through which the insulating layer of the power cable and the conductor connecting portion are passed, and the outer diameter of the insulating layer of the power cable is set to the outer diameter of the rubber block insulating cylinder. It may be 1.1 times or more and 1.5 times or less the inner diameter of the center hole.
  • the tape of the outer layer may be wrapped by wrapping.
  • the two power cables may be power cables having a voltage class of 66 [kV] or more.
  • the two power cables have a protective layer, and both of the two power cables have a lower layer exposed from the protective layer, and one of the above powers.
  • the exposed length of the lower layer of the protective layer is longer than that of the other power cable, and the outer layer (in the case of a configuration having no outer layer, the semi-conductive tape layer) is The end of the winding end of the tape has a longer exposure length from the protective layer to the lower layer of the outer layer (in the case of a configuration having no outer layer, the semi-conductive tape layer). It may be configured to be located on the end side of the power cable side.
  • the outer diameter of the outer layer or the semi-conductive tape layer is one of the insulating layers over the entire length of the power cable in the longitudinal direction. It may be configured to be smaller than the outer diameter of the conical surface connecting the tip end portion of the above and the tip end portion of the other insulating layer.
  • the present invention is a method for constructing an intermediate connection portion of a power cable.
  • the present invention is a method for constructing an intermediate connection portion of a power cable.
  • the present invention is a method for constructing an intermediate connection portion of a power cable.
  • the outer layer (having an outer layer) is formed in the step of forming the outer layer (in the case of a configuration having no outer layer, the semi-conductive tape layer).
  • the tape of the outer layer or the semi-conductive tape layer at the end on the power cable side inserted into the rubber block insulating cylinder in the insertion step of the semi-conductive tape layer). You may wind it so that it finishes winding.
  • the present invention can suppress a decrease in electrical performance and provide a highly reliable intermediate connection portion of a power cable and a method for forming the intermediate connection portion.
  • FIG. 1 is a front view in which a part of the intermediate connection portion 100 to which the power cable 10 is connected is cut out
  • FIG. 2 is an enlarged cross-sectional view of the periphery of the conductor connection portion 20 described later.
  • the present embodiment relates to an intermediate connection portion 100 that connects two power cables 10.
  • the intermediate connecting portion 100 is a semiconducting portion composed of a conductor connecting portion 20 connecting conductors 11 exposed from the insulating layer 12 of the two power cables 10 and a semiconductive tape formed on the outer periphery of the conductor connecting portion 20.
  • the two power cables 10 both have the same configuration, but when they are described separately below, the power cable 10A (the power cable on the left side in FIG. 1) and the power cable 10B (FIG. 1) (Power cable on the right side in) is described by another code. Further, for example, when it is not necessary to separately explain the same structure as in the case of explaining the same structure, the power cable 10 is described.
  • the power cable 10 includes a conductor 11, an insulating layer 12, an external semi-conductive layer 13, and a sheath 14 which is a protective layer in this order from the center.
  • the power cable 10 is, for example, a high-voltage power cable having a voltage class of 66 [kV].
  • the intermediate connection portion 100 can also be applied to a power cable for higher voltage having a voltage class exceeding 66 [kV].
  • the conductor 11 is made of a good conductor, for example, copper or aluminum.
  • the insulating layer 12 is formed of a highly insulating resin such as cross-linked polyethylene.
  • the outer semi-conductive layer 13 is formed of, for example, a semi-conductive rubber obtained by adding carbon to an insulating material such as silicone rubber, ethylene propylene rubber, or chloroprene.
  • the sheath 14 is made of a material having strength suitable for protecting the inner layer, such as polyethylene. In addition to these, a configuration having an internal semi-conductive layer, a shielding layer, or the like that a general power cable has may be used.
  • each power cable 10 is stepped so that the outer circumferences of the layers 11, 12, and 13 are exposed. Further, in one power cable 10B, the sheath 14 is excessively removed as compared with the other power cable 10A, and the outer circumference of the outer semiconductive layer 13 is exposed in a longer range. This is because the rubber block insulating cylinder 50 is temporarily retracted on the exposed external semi-conductive layer 13 of the power cable 10B in the process of constructing the intermediate connection portion 100.
  • the conductors 11 of the two power cables 10 are individually inserted into both ends of a conductor connecting pipe 21 made of a good conductor in a concentric and facing state, and are electrically connected by brazing, compression, pressure welding, or the like. And this connection structure is a conductor connection part 20.
  • the conductors 11 may be electrically connected to each other, and the use of the conductor connecting pipe 21 is not essential. For example, the conductors 11 may be directly connected by brazing.
  • a semi-conductive tape layer 30 is formed by laminating a number of layers of semi-conductive tape so as to fill the dent.
  • the semi-conductive tape is, for example, a tape in which a semi-conductive adhesive material is applied to the back surface of a conductive vulcanized rubber sheet.
  • the semi-conductive tape layer 30 is formed by winding the semi-conductive tape in multiple layers with the back surface facing inward (for example, 1/2 wrap winding).
  • the wrap winding means winding the tape so as to overlap a part of the tape in the width direction, and has a cross section as shown in FIGS. 4 and 7.
  • the 1/2 wrap winding is a winding method in which 1/2 of the tape in the width direction is overlapped.
  • the semi-conductive tape may be a tape made of another material having semi-conductivity, and an adhesive material is not essential, and a self-bonding tape or the like may be used.
  • the outer diameter of the semi-conductive tape layer 30 is set smaller than the outer diameter of the insulating layer 12 of the power cable 10.
  • An outer layer 40 made of the semi-conductive cross-linked polyethylene tape 41 is formed on the outer periphery of the semi-conductive tape layer 30.
  • FIG. 3 is a front view of the outer layer 40.
  • the semi-conductive cross-linked polyethylene tape 41 may have a smaller number of layers than the semi-conductive tape layer 30, for example, one layer.
  • the semi-conductive cross-linked polyethylene tape 41 is a tape made of semi-conductive cross-linked polyethylene and having a semi-conductive adhesive material coated on the back surface. The back surface of the semi-conductive cross-linked polyethylene tape 41 is wound inward by wrapping (for example, 1/2 wrap) to form the outer layer 40.
  • the surface of the semi-conductive cross-linked polyethylene tape 41 has a main insulating portion 51 and an internal semi-conductive portion 52 of the rubber block insulating cylinder 50, which will be described later, as compared with the surface of the semi-conductive tape constituting the semi-conductive tape layer 30.
  • the dynamic friction coefficient is small for both the stress cones 53 and 54.
  • the rubber block insulating cylinder 50 slides on the surface of the semi-conductive cross-linked polyethylene tape 41, so that it is preferable that the dynamic friction coefficient is small in this way.
  • the semi-conductive cross-linked polyethylene tape 41 may have a semi-conductive tape layer 30 because the slide may be restarted by stopping in the middle for checking the dimensions and the like. It is more preferable that the coefficient of static friction is smaller than that of the surface of the constituent semi-conductive tape.
  • the outer diameter of the outer layer 40 is slightly smaller than that of the insulating layer 12 of the power cable 10 over the entire length in the central axial direction (hereinafter referred to as the axial direction) of the power cable 10, and the difference in outer diameter with respect to the insulating layer 12 is large. , Greater than 0 and less than 5 [mm].
  • a rubber block insulating cylinder 50 is arranged further outside the outer layer 40. Since the rubber block insulating cylinder 50 has elasticity and contractility, the outer layer has an outer diameter difference of 5 [mm] or less.
  • the outer circumference of the 40 and the inner circumference of the rubber block insulating cylinder 50 have a portion in close contact with each other, and conductivity is ensured between the outer circumference of the outer layer 40 and the inner semiconductive portion 52 of the rubber block insulating cylinder 50. Further, even if a gap is generated due to a step between the outer layer 40 and the insulating layer 12 of the power cable 10, the insulating layer 12 includes a rubber block insulating cylinder 50, an internal semiconductive portion 52, and a stress cone 53. Since there is no gap that is surely adhered to any of the 54 and is accompanied by dielectric breakdown, and the outer layer 40 can secure the conductivity with the inner semi-conductive portion 52, the electrical characteristics are excellent. Does not cause a drop.
  • the difference in the outer diameter of the outer layer 40 with respect to the outer diameter of the insulating layer 12 is more preferably 0.4 [mm] or more and 1 [mm] or less.
  • the difference in outer diameter between the outer layer 40 and the insulating layer 12 of the power cable 10 may be 0.
  • the end portion 411 of the winding end of the semi-conductive cross-linked polyethylene tape 41 of the outer layer 40 is located on the power cable 10B side of the outer layer 40, more preferably at the end portion thereof.
  • the exposed length of the external semi-conductive layer 13 of the power cable 10B (the removal length of the sheath 14) is longer than that of the power cable 10A, and the rubber block insulating cylinder 50 is temporarily used in the construction process of the intermediate connection portion 100. It becomes a typical evacuation area (see FIGS. 5C to 6B).
  • the temporarily retracted rubber block insulating cylinder 50 slides to the power cable 10A side and is arranged at a regular position where the periphery of the conductor connecting portion 20 is stored inside.
  • the end portion 411 at the end of winding of the semi-conductive cross-linked polyethylene tape 41 may be slidably contacted with the inner circumference of the rubber block insulating cylinder 50 and peeled off, and may move in the same direction as the rubber block insulating cylinder 50.
  • the end portion 411 at the end of winding of the semi-conductive cross-linked polyethylene tape 41 moves to the power cable 10A side from the internal semi-conductive portion 52 of the rubber block insulating cylinder 50 described later, the electrical characteristics deteriorate.
  • the rubber block insulating cylinder 50 has a cylindrical shape along the axial direction, and both ends thereof have a shape in which the diameter is gradually reduced. Further, a central hole 56 through which the conductor connecting portion 20 of the power cable 10 is inserted is formed through the center of the rubber block insulating cylinder 50.
  • the rubber block insulating cylinder 50 includes a main insulating portion 51 made of EP rubber (ethylene propylene rubber) which is an insulator, and an internal semi-conductive portion 52 provided in the central portion in the axial direction inside the main insulating portion 51.
  • the main insulating portion 51 has stress cones 53 and 54 formed at one end and the other end in the axial direction.
  • an external semi-conductive portion 55 is formed on the outer periphery of the main insulating portion 51, except for a part that becomes an end portion on the power cable 10B side.
  • the inner semi-conductive portion 52, the stress cones 53, 54 and the outer semi-conductive portion 55 are formed of semi-conductive rubber obtained by adding carbon to an insulating material such as silicone rubber, ethylene propylene rubber or chloroprene.
  • the central hole 56 has a uniform inner diameter over the entire length, and penetrates the central hole 56 so that the entire rubber block insulating cylinder 50 is axisymmetric. That is, the central hole 56 is stressed from one end side (power cable 10A side) of the rubber block insulating cylinder 50 to the stress cone 53, the internal semiconductive portion 52, and the other end side (power cable 10B side) of the rubber block insulating cylinder 50. It penetrates the cone 54 in order.
  • the inner diameter of the central hole 56 is set to be smaller than the outer diameter of the outer semi-conductive layer 13 and the insulating layer 12 of the power cable 10, and further is set to be smaller than the outer diameter of the outer layer 40. Therefore, it self-shrinks when attached and comes into close contact with the power cable 10.
  • the outer diameter of the insulating layer 12 of the power cable 10 is 1.1 times or more and 1.5 times or less with respect to the inner diameter of the central hole 56 of the rubber block insulating cylinder 50.
  • the internal semi-conductive portion 52 is longer than the outer layer 40 described above in the axial direction. Further, the inner circumference of the inner semi-conductive portion 52 is in close contact with the outer periphery of the outer layer 40 and is in a state of being electrically connected. When the power cable 10 is energized, the inner semi-conductive portion 52 is connected to the conductor connecting portion 20. It becomes the same potential as.
  • the stress cones 53 and 54 are in close contact with the end of the outer semi-conductive layer 13 of the power cable 10A and the end of the outer semi-conductive layer 13 of the power cable 10B, respectively, and are electrically connected to each other. ing.
  • the stress cones 53 and 54 have the same potential as the external semi-conductive layer 13 of the power cable 10A and the external semi-conductive layer 13 of the power cable 10B.
  • the construction method of the intermediate connection portion 100 of the power cable having the above configuration will be described with reference to FIGS. 5A to 6C.
  • the insulating layer 12, the outer semi-conductive layer 13, and the sheath 14 of the two power cables 10A and 10B to be connected are stripped off, and the conductor 11, the insulating layer 12, and the outer semi-conductive layer 13 are stripped.
  • the outer circumference of the power cable is exposed (power cable processing process).
  • the sheath 14 of the outer semi-conductive layer 13 of the power cable 10B is removed so that the exposed length thereof is at least longer than the total length of the rubber block insulating cylinder 50.
  • a jig 101 for inserting into the center hole 56 of the rubber block insulating cylinder 50 is attached to the tip of the power cable 10B.
  • the power cable 10B and the rubber block insulating cylinder 50 are held concentrically, and the power cable 10B is inserted into the center hole 56 of the rubber block insulating cylinder 50 by using a press-fitting device (not shown). (Insert process).
  • a press-fitting device not shown.
  • the rubber block insulating cylinder 50 is temporarily arranged on the outer periphery of the outer semi-conductive layer 13 of the power cable 10B.
  • the jig 101 of the power cable 10B is removed, and the conductors 11 of the power cables 10A and 10B are connected to each other by the conductor connecting pipe 21 to form the conductor connecting portion 20 (connection step). ). Further, as shown in FIG. 6B, the semi-conductive tape is wound around the exposed conductor 11 and the outer periphery of the conductor connecting tube 21 by wrapping to form the semi-conductive tape layer 30 (formation of the semi-conductive tape layer). Process).
  • the semi-conductive cross-linked polyethylene tape 41 is wrapped around the outer circumference of the semi-conductive tape layer 30 by wrapping to form the outer layer 40 (the step of forming the outer layer).
  • the semi-conductive cross-linked polyethylene tape 41 is wound so that the end portion ends at the end of the outer layer 40 on the power cable 10B side, and the outer diameter of the outer layer 40 at the end of winding is the insulating layer 12 of the power cable 10. Make it slightly smaller than the outer diameter.
  • the rubber block insulating cylinder 50 is slid toward the power cable 10A side so as to be properly arranged (sliding step). Also in this case, it is preferable to apply a lubricant such as silicone in advance to the outer periphery of the outer layer 40, the insulating layer 12 of the power cable 10A, and the outer periphery of the outer semiconductive layer 13.
  • a lubricant such as silicone in advance to the outer periphery of the outer layer 40, the insulating layer 12 of the power cable 10A, and the outer periphery of the outer semiconductive layer 13.
  • the internal semi-conductive portion 52 is connected to the outer periphery of the conductor connecting portion 20, and the stress cones 53 and 54 are respectively connected to the outer semi-conductive layer 13 of the power cable 10A. It is in a state of being connected to the external semi-conductive layer 13 of the power cable 10B. As a result, the construction of the intermediate connection portion 100 of the power cable is completed.
  • the intermediate connection portion 100 of the power cable has an outer layer 40 made of a semi-conductive cross-linked polyethylene tape 41 having a lower dynamic friction coefficient with respect to the rubber block insulating cylinder 50 than the semi-conductive tape on the outer periphery of the semi-conductive tape layer 30. I have. Therefore, during the construction of the intermediate connection portion 100, the rubber block insulating cylinder 50 smoothly slides through the outer periphery of the outer layer 40, so that the semi-conductive tape and the semi-conductive cross-linked polyethylene tape 41 are slid and damaged. It is possible to prevent the end portion from being dragged and being caught in the gap between the rubber block insulating cylinder 50 and the insulating layer 12.
  • the outer layer 40 is made of a semi-conductive cross-linked polyethylene tape 41 having adhesiveness on one side, the dynamic friction coefficient is reduced and good electrical connection with the conductor connecting portion 20 is realized, and the conductor The same potential can be obtained from the connecting portion 20 to the internal semi-conductive portion 52 of the rubber block insulating cylinder 50.
  • the outer diameter of the insulating layer 12 of the power cable 10 is 1.1 times or more and 1.5 times or less the inner diameter of the central hole 56 of the rubber block insulating cylinder 50, the inner wall of the central hole 56 of the rubber block insulating cylinder 50 is formed. It is in close contact with the insulating layer 12, the external semi-conductive layer 13, and the outer layer 40 of the power cable 10, and good insulation performance and electrical connection can be obtained. Further, since the outer diameter of the outer layer 40 is smaller than the outer diameter of the insulating layer 12 of the power cable 10, the semi-conductive tape or the semi-conductive cross-linked polyethylene tape 41 is damaged when the rubber block insulating cylinder 50 is slid.
  • the outer diameter of the outer layer 40 is set smaller than the outer diameter of the insulating layer 12 of the power cable 10 within a range of 5 [mm] or less, it self-shrinks when the rubber block insulating cylinder 50 is attached. As a result, the outer layer 40 and the inner semi-conductive portion 52 can be brought into close contact with each other, and the conductor connecting portion 20 to the inner semi-conductive portion 52 can be stably at the same potential.
  • the rubber block insulating cylinder 50 self-shrinks. While ensuring contact with the outer layer 40 by the force, it is possible to suppress the frictional force at the time of sliding and effectively prevent the tape from being caught. Further, since the semi-conductive cross-linked polyethylene tape 41 of the outer layer 40 is wrapped around, it is possible to effectively reduce the occurrence of gaps between the tapes.
  • the exposed length of the outer semi-conductive layer 13 on the lower side of the sheath 14 on the power cable 10B side is longer than that on the power cable 10A side, and the end portion 411 of the winding end of the semi-conductive cross-linked polyethylene tape 41 is the outer layer. It is located on the power cable 10B side, more preferably on the end side, than the axial intermediate position in 40.
  • the rubber block insulating cylinder 50 slides from the outer semi-conductive layer 13 of the power cable 10B to the power cable 10A side during construction, the end portion 411 of the winding end of the semi-conductive crosslinked polyethylene tape 41 Is located far from the power cable 10A, and even if peeling occurs, it effectively suppresses the internal semi-conductive portion 52 from being dragged to the power cable 10A side and being sandwiched between the insulator 12 and the power cable 10. It is possible to provide an intermediate connection portion having better electrical characteristics.
  • the two power cables 10A and 10B exemplify a case where the voltage class is 66 [kV] or more, but even such a high voltage cable has good electrical characteristics. It is possible to provide an intermediate connection.
  • the intermediate connection portion 100 of the power cable forms the conductor connection portion 20 by connecting the conductors 11 of the two power cables 10A and 10B to each other in the insertion step of inserting the power cable 10B into the rubber block insulating cylinder 50.
  • a plurality of steps including a forming step and a sliding step of sliding the rubber block insulating cylinder 50 along the two power cables 10A and 10B to a position where the internal semi-conductive portion 52 covers the outer layer 40 are in the order described above. Construction will be done at. Therefore, in the sliding process, the rubber block insulating cylinder 50 smoothly slides and passes through the outer periphery of the outer layer 40, so that the semi-conductive tape or the semi-conductive cross-linked polyethylene tape 41 is damaged or the end of the tape winding end. Entrainment of 411 is reduced, deterioration of electrical performance and occurrence of dielectric breakdown are suppressed, and highly reliable construction can be performed.
  • the present invention has been described above. However, the present invention is not limited to the above-described embodiment, and the details shown in the embodiment can be appropriately changed without departing from the spirit of the invention.
  • the material of each configuration constituting the intermediate connection portion 100 of the power cable is only an example, and can be changed as appropriate.
  • the main insulating portion 51 of the rubber block insulating cylinder 50 may be any insulating material, and may be silicone rubber or chloroprene, which is an insulating material other than ethylene propylene rubber.
  • the outer layer 40C may be formed of a tape 41C thinner than the semiconductive tape of the semiconductive tape layer 30.
  • the thickness of the tape 41C is 0.1 to 0.5 [mm].
  • the power cable can be formed in the same steps as those shown in FIGS. 5A to 6C. It is possible to construct an intermediate connection part.
  • the material is semi-conductive crosslinked polyethylene having a smaller dynamic friction coefficient than the semi-conductive tape of the semi-conductive tape layer 30.
  • a semi-conductive tape made of the same material as the semi-conductive tape layer 30 may be used.
  • the outer layer 40C is also the insulating layer 12 of the power cable 10. It is preferably smaller in the range of 5 [mm] or less than the outer diameter, and more preferably smaller in the range of 0.4 [mm] or more and 1 [mm] or less.
  • the semi-conductive tape layer 30 may be formed with a diameter smaller than that of the insulating layer 12 of the power cable 10 without forming the outer layer 40.
  • the outer diameter of the semi-conductive tape layer 30 is smaller than the insulating layer 12 of the power cable 10 in the range of 5 [mm] or less, and further, in the range of 0.4 [mm] or more and 1 [mm] or less. It is preferable to have a small diameter. Also in this case, it is preferable that the semi-conductive tape layer 30 is wrapped.
  • the rubber block insulating cylinder 50 and the semi-conductive tape layer 30 come into contact with each other due to the self-shrinking force of the rubber block insulating cylinder 50, but the semi-conductive tape layer 30 has a smaller diameter, so that the rubber block insulating cylinder 50 has a smaller diameter.
  • the dynamic friction force and the static friction force are reduced, the entrainment of the semi-conductive tape can be reduced, and the deterioration of the electrical performance and the occurrence of dielectric breakdown due to the concentration of the electric field can be suppressed.
  • the semi-conductive tape layer 30 is formed having a diameter smaller than that of the insulating layer 12 of the power cable 10, in the steps shown in FIGS. 5A to 6C, in the step of FIG. 6B. It is possible to construct the intermediate connection portion of the power cable by forming the outer diameter of the semi-conductive tape layer 30 with the above-mentioned target outer diameter by wrapping and changing the outer diameter so as not to form the outer layer 40. .. At this time, the semi-conductive tape is wound so that the end portion ends at the end portion of the semi-conductive tape layer 30 on the power cable 10B side.
  • the insulating layer 12 of the power cable 10A is illustrated.
  • the semi-conductive tape layer 30 and the outer layer 40 are wrapped with tape so that a conical surface parallel to the conical surface Q connecting the tip of the cable and the tip of the insulating layer 12 of the power cable 10B is formed. It is preferable to form.
  • the outer diameter R1 of the conical surface of the outer layer 40 is a cone that connects the tip of the insulating layer 12 of the power cable 10A and the tip of the insulating layer 12 of the power cable 10B at any position in the axial direction.
  • the semi-conductive tape layer 30 is connected to the tip of the insulating layer 12 of the power cable 10A and the tip of the insulating layer 12 of the power cable 10B. It is preferable to wrap the tape so that a conical surface parallel to the conical surface is formed. In this case as well, the outer diameter of the conical surface of the semi-conductive tape layer 30 determines the tip of the insulating layer 12 of the power cable 10A and the tip of the insulating layer 12 of the power cable 10B at any position in the axial direction. It is smaller than the outer diameter of the connecting conical surfaces. In the case of FIG. 9 (including the case where the example of FIG.
  • the outer diameter of the conical surface of the outer layer 40 can be set at any position in the axial direction. It is smaller than the outer diameter of the conical surface Q that connects the tip of the insulating layer 12 of the power cable 10A and the tip of the insulating layer 12 of the power cable 10B. Further, at any position in the axial direction, the outer diameter of the conical surface of the outer layer 40 (semi-conductive tape layer 30) is made smaller than the outer diameter of the conical surface Q within a range of 5 [mm] or less, and further. , It is preferable that the diameter is small in the range of 0.4 [mm] or more and 1 [mm] or less.
  • the present invention can be used for a power cable.

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Abstract

La présente invention permet d'améliorer les caractéristiques électriques et la fiabilité.　La présente invention comprend : une partie de connexion de conducteur 20 à laquelle des conducteurs 11 exposés à partir de couches isolantes 12 de deux câbles d'alimentation 10 sont connectés ; une couche de bande semi-conductrice 30 comprenant une bande semi-conductrice formée sur la périphérie externe de la partie de connexion de conducteur ; et un tube isolant fait d'un bloc en caoutchouc 50 disposé sur les côtés extérieurs de la partie de connexion de conducteur et de la couche de bande semi-conductrice, où une couche externe 40 comprenant une bande 41 ayant un coefficient de frottement dynamique inférieur par rapport au tube isolant fait d'un bloc en caoutchouc à la bande semi-conductrice est disposée sur la périphérie externe de la couche de bande semi-conductrice.
PCT/JP2020/014066 2019-03-29 2020-03-27 Partie de connexion intermédiaire d'un câble d'alimentation et procédé de construction WO2020203788A1 (fr)

Priority Applications (2)

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CN202080018749.2A CN113544924B (zh) 2019-03-29 2020-03-27 电力线缆的中间连接部及其施工方法
JP2020547153A JP6852231B2 (ja) 2019-03-29 2020-03-27 電力ケーブルの中間接続部の施工方法

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JP2009100585A (ja) * 2007-10-18 2009-05-07 Viscas Corp ケーブル接続部の処理方法及び構造
JP2011239494A (ja) * 2010-05-06 2011-11-24 Furukawa Electric Co Ltd:The 電力ケーブル用差込型接続体及びこれを用いた電力ケーブルの接続方法

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JPS4637156Y1 (fr) * 1967-04-14 1971-12-22
JP2003028912A (ja) * 2001-05-07 2003-01-29 Mitsubishi Cable Ind Ltd 常温収縮型絶縁体の耐圧試験方法及び耐圧試験装置
JP2009100585A (ja) * 2007-10-18 2009-05-07 Viscas Corp ケーブル接続部の処理方法及び構造
JP2011239494A (ja) * 2010-05-06 2011-11-24 Furukawa Electric Co Ltd:The 電力ケーブル用差込型接続体及びこれを用いた電力ケーブルの接続方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022210079A1 (fr) * 2021-03-31 2022-10-06 古河電気工業株式会社 Procédé de formation de structure de connexion intermédiaire de câble et structure de connexion intermédiaire de câble
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CN113544924A (zh) 2021-10-22
JP6852231B2 (ja) 2021-03-31
JPWO2020203788A1 (ja) 2021-04-30
CN113544924B (zh) 2023-02-17

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