WO2009125568A1 - Unité en caoutchouc et partie de raccordement de câble utilisant ladite unité en caoutchouc - Google Patents

Unité en caoutchouc et partie de raccordement de câble utilisant ladite unité en caoutchouc Download PDF

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Publication number
WO2009125568A1
WO2009125568A1 PCT/JP2009/001582 JP2009001582W WO2009125568A1 WO 2009125568 A1 WO2009125568 A1 WO 2009125568A1 JP 2009001582 W JP2009001582 W JP 2009001582W WO 2009125568 A1 WO2009125568 A1 WO 2009125568A1
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WO
WIPO (PCT)
Prior art keywords
cylindrical
rubber unit
peripheral surface
metal fitting
cable
Prior art date
Application number
PCT/JP2009/001582
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English (en)
Japanese (ja)
Inventor
瀬間信幸
Original Assignee
昭和電線ケーブルシステム株式会社
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Publication of WO2009125568A1 publication Critical patent/WO2009125568A1/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
    • H02G15/02—Cable terminations
    • H02G15/06—Cable terminating boxes, frames or other structures
    • H02G15/064—Cable terminating boxes, frames or other structures with devices for relieving electrical stress
    • 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
    • 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
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/184—Cable junctions protected by sleeves, e.g. for communication cable with devices for relieving electrical stress

Definitions

  • the present invention relates to a rubber unit and a cable connecting portion using the rubber unit, and more particularly to a rubber unit mounted on the outer periphery of a cable insulator of a high-voltage CV cable (crosslinked polyethylene cable) and a cable connecting portion using the rubber unit.
  • CV cable crosslinked polyethylene cable
  • FIG. 12 shows a longitudinal sectional view of the main part of such a rubber block insulation type intermediate connection part.
  • the rubber block insulation type intermediate connection portion is formed on a conductor connection portion 200 of a high voltage CV cable formed by compressing and connecting a pair of cable conductors (not shown) with a connection sleeve 100, and on the outer periphery of the conductor connection portion 200.
  • a cylindrical rubber unit 400 that is inserted between the outer circumferences of the pair of cable insulators 300a and 300b.
  • the rubber unit 400 is composed of a cylindrical main insulator 500 made of a silicone rubber material, and a semiconductive silicone rubber material integrally embedded in the inner peripheral surface of the central portion of the main insulator 500.
  • the inner semi-conductor 600, the stress cones 700a and 700b made of semi-conductive silicone rubber material integrally embedded in the inner peripheral surfaces of both ends of the main insulator 500, and the outer periphery of the main insulator 500 are provided.
  • an external semiconductive layer 800 made of a semiconductive coating layer or a semiconductive rubber layer. Note that the inner diameter of the insertion part of the rubber unit 400 is slightly smaller than the outer diameter of the cable insulators 300a and 300b.
  • the rubber unit 400 having such a configuration is inserted between the outer periphery of the pair of cable insulators 300a and 300b on the outer periphery of the conductor connecting portion 200 by using a diameter expansion jig (not shown) such as a spiral core. Due to the self-shrinkage force, the cable insulators 300a and 300b are brought into close contact with the outer periphery, thereby ensuring the insulation performance in the rubber block insulating intermediate connection portion.
  • the rubber unit 400 can be easily contracted and adhered to the outer periphery of the cable insulators 300a and 300b at the construction site by simply pulling out the spiral core without requiring a special tool. Since it can be used, it is excellent in workability.
  • the surface pressure with the interface of the cable insulators 300a and 300b is obtained by the contraction force of the rubber unit 400, as shown in FIG.
  • a surface corresponding to the electric field strength of the rising portion A as shown in FIG. Since the pressure is applied with a constant tightening force over the entire length of the rubber unit 400, the surface of the portions other than the rising portion A of the stress cones 700a and 700b (filled portion in FIG. 13B) is more than necessary. Pressure is applied.
  • reference numeral 900 denotes an equipotential line.
  • the required maximum surface pressure is applied with a constant tightening force over the entire length of the rubber unit 400, so that the rubber unit 400 has excellent elongation characteristics.
  • the rubber unit 400 has to be second vulcanized in order to stabilize its physical properties after the rubber unit 400 is first vulcanized, and the overall material cost and processing cost are high. There was a difficulty of becoming.
  • the rubber unit 400 applied to the intermediate connection portion of the high voltage CV cable of 33 kV or less it can be inserted and attached to the outer periphery of the cable insulators 300a and 300b without using a diameter expansion jig such as a spiral core.
  • a diameter expansion jig such as a spiral core
  • the tightening margin of the rubber unit 400 the inner diameter of the rubber unit 400. Is required to slide the rubber unit 400 along the outer peripheral surfaces of the cable insulators 300a and 300b. Met.
  • the present invention has been made to solve the above-mentioned problems, and by reducing the surface pressure distribution of the rubber unit with respect to the cable insulator to the electric field strength distribution as much as possible, the surface pressure is reduced, and as a result, assembly.
  • the purpose is to provide a cable connection part that is skillless by using a rubber unit that is easy to construct.
  • a rubber unit includes an insulating cylinder made of an elastic material, and a cylindrical metal fitting concentrically provided integrally with the insulating cylinder at at least one end of the insulating cylinder.
  • a cylindrical stress cone is embedded concentrically with the insulating cylinder in the inner periphery of the end portion facing the metal fitting of the tube, and the metal fitting faces the stress cylinder of the first cylindrical portion and the first cylindrical portion.
  • a second cylindrical portion concentrically connected to the first cylindrical portion is provided at the end opposite to the end portion, and the end facing the metal fitting of the insulating cylinder extends toward the second cylindrical portion.
  • a cylindrical outer extension is provided, the inner peripheral surface of which can be attached to the outer peripheral surface of the second cylindrical portion, and the end facing the metal fitting of the stress cone faces the first cylindrical portion.
  • a cylindrical inner extension is provided, the inner peripheral surface of which can be attached to the outer peripheral surface of the first cylindrical portion;
  • the inner peripheral surface of the long portion is integrally bonded to the outer peripheral surface of the second cylindrical portion, and the inner peripheral surface of the inner extension portion is attached to the outer peripheral surface of the first cylindrical portion in an unbonded state. It is.
  • a rubber unit includes an insulating cylinder made of an elastic material, and a cylindrical metal fitting concentrically provided integrally with the insulating cylinder at at least one end of the insulating cylinder.
  • a cylindrical stress cone is embedded concentrically with the insulating cylinder at the end of the cylinder facing the metal fitting, and the metal fitting is opposite to the first cylinder and the end of the first cylinder facing the stress cone.
  • the inner peripheral surface located on the end side opposite to the end facing the stress cone is integrally bonded to the outer peripheral surface of the second cylindrical portion.
  • the inner peripheral surface located on the end side facing the stress cone is the outer peripheral surface of the first cylindrical portion. It is what is deposited in a non-adhesive state by.
  • an annular groove or protrusion is provided on the outer peripheral surface of the first cylindrical portion in the vicinity of the second cylindrical portion.
  • An annular protrusion or groove that can be fitted into the groove or protrusion is provided on the inner periphery of the inner extension.
  • an annular groove or protrusion is provided on the outer peripheral surface of the first cylindrical portion in the vicinity of the second cylindrical portion,
  • An annular protrusion or groove that can fit into the groove or protrusion is provided on the inner periphery of the recess.
  • the outer peripheral edge of the end opposite to the end opposite to the stress cone of the metal fitting is continuously provided outward in the radial direction.
  • the cable connection part which is a 6th aspect of this invention is a conductor connection part of the power cable formed by connecting the cable conductors of a pair of power cables, and any one of the first to fifth aspects.
  • a rubber unit is provided, and the rubber unit is elastically attached to the outer periphery of the conductor connection portion across the outer periphery of the cable insulator constituting the pair of power cables.
  • the cable connecting portion according to the seventh aspect of the present invention includes a cable terminal portion in which a cable insulator is exposed by a stripping process, and a soot tube that surrounds the cable terminal portion and has a lower metal fitting on its low-pressure side.
  • the cable connection portion according to the eighth aspect of the present invention includes a cable terminal portion in which a cable insulator is exposed by a stripping process, and a soot tube surrounding the cable terminal portion and having a lower metal fitting disposed on its own low pressure side. And a rubber unit according to any one of the first to fifth aspects, and a cylindrical adapter disposed between the lower metal fitting and the rubber unit and having a flange portion on the high-pressure side,
  • a metal fitting constituting the rubber unit is mounted on the outer periphery of the cable insulator toward the adapter side, and the metal fitting is fixed to the flange portion via an O-ring.
  • the rubber unit according to the first to eighth aspects of the present invention and the cable connecting portion using the rubber unit have the following effects.
  • a large clamping force can be generated in the vicinity of the stress cone cable insulator and the surface pressure can be applied intensively to the high electric field strength portion of the rising portion of the stress cone.
  • the surface pressure distribution can be matched to the electric field strength distribution as much as possible, and the tightening force of the entire rubber unit can be reduced by designing a rubber unit having a small diameter difference.
  • the connecting portion of the high-pressure CV cable can be assembled by a self-compression slide type, a diameter expansion holding member such as a spiral core becomes unnecessary, and the cost can be reduced.
  • the reliability of the seal part can be greatly improved by the seal structure using the O-ring.
  • one of the fittings is an annular groove.
  • the metal fitting and the stress cone can be integrated with a stronger adhesion state.
  • the partial sectional view of the rubber unit in the 1st example of the present invention The exploded sectional view of the rubber unit in the 1st example of the present invention.
  • the partial sectional view of the cable connection part (intermediate connection part) in the 2nd example of the present invention Explanatory drawing which shows the state before the assembly of the rubber unit in the 2nd Example of this invention, and after an assembly. Explanatory drawing which shows the provision condition of the electric field and surface pressure of a cable connection part (intermediate connection part) in 2nd Example of this invention.
  • the partial sectional view of the cable connection part (termination connection part) in the 4th example of the present invention The partial sectional view of the rubber unit in the 1st example of the present invention.
  • Ua, Ub rubber units 1a, 1b ... insulating cylinders 4a, 4b, 4c ... stress cones 11a, 11b, 11c ... outer extension parts 21a, 21b, 21c ... first cylindrical part 22a, 22b, 22c ... 2nd cylindrical part 23a, 23b, 23c ... Groove 26 ... Flange part 43a, 43b, 43c ... Inner extension part 44a, 44b, 44c ... Projection part 81a, 81b, 81c ... Cable insulator 83 ... Conductor connection part 9 ... Cable terminal part 91 ... Lower metal fitting 92 ... Steel pipe 93 ... Adapter 95 ... O-ring
  • FIG. 1 is a longitudinal sectional view of a rubber unit of the present invention suitable for an intermediate connection part of a 110 to 132 kV class high voltage CV cable.
  • a rubber unit Ua of the present invention includes an insulating cylinder 1a formed of an elastic material, for example, a silicone rubber material, and a cylindrical shape provided integrally with both ends of the insulating cylinder 1a concentrically with the insulating cylinder 1a.
  • Metal fittings 2a and 2b are provided.
  • the insulating cylinder 1a includes a cylindrical main insulator 10a, and cylindrical outer extensions 11a extending toward the metal fittings 2a and 2b, respectively, at outer peripheral edges of both ends of the main insulator 10a, 11b is provided concentrically with the main insulator 10a. Further, on the inner peripheral surface side of the end portion of each outer extension portion 11a, 11b, annular thick portions 12a, 12b whose inner peripheral surface can be attached to the outer peripheral surfaces of metal fittings 2a, 2b described later. Is provided.
  • the outer peripheral surface of the cylindrical main insulator 10a and the outer peripheral surface of the cylindrical outer extension portions 11a and 11b are formed to be flush with each other, and the inner periphery of the annular thick portions 12a and 12b
  • the surface and the inner peripheral surfaces of inner extensions 43a and 43b of stress cones 4a and 4b described later are formed so as to be flush with each other.
  • An inner semiconductor made of a cylindrical semiconductive elastic material for example, a semiconductive silicone rubber material, is formed on the inner peripheral surface of the central portion of the main insulator 10a, and a cylindrical shape is formed on the inner peripheral surfaces of both ends.
  • the inner peripheral surface of the inner semiconductor 3 and the pair of stress cones 4a and 4b are formed to be flush with the inner peripheral surface of the main insulator 10a.
  • the pair of stress cones 4a and 4b includes electric field relaxation portions 41a and 41b each having a tapered inner peripheral surface that expands in a trumpet shape toward the outer periphery of the central portion of the main insulator 10a. And have thick cylindrical portions 42a, 42b on the side facing the metal fittings 2a, 2b, and on the outer surface of the metal fittings 2a, 2b on the side facing the metal fittings 2a, 2b of each cylindrical portion 42a, 42b.
  • An annular inner extension 43a, 43b that can be deposited is provided.
  • annular protrusions 44a and 44b are provided on the inner circumferences of the ends of the inner extensions 43a and 43b on the side facing the metal fittings 2a and 2b.
  • the axial lengths of the outer extensions 11a and 11b are approximately twice the axial length of the inner extensions 43a and 43b.
  • the metal fittings 2a and 2b are each formed of aluminum or the like, and as shown in FIG. 2 (b), first cylindrical portions to which the inner peripheral surfaces of the inner extensions 43a and 43b of the stress cones 4a and 4b are attached, respectively.
  • the first cylindrical portions 21a and 21b are concentrically connected to the end opposite to the end facing the stress cones 4a and 4b.
  • annular concave grooves 23a and 23b are provided on the outer peripheral surfaces of the first cylindrical portions 21a and 21b in the vicinity of the second cylindrical portions 22a and 22b.
  • the inner diameters of the metal fittings 2a and 2b are larger than the outer diameters of the cable insulators 81a and 81b described later, and the outer diameters of the metal fittings 2a and 2b are the inner diameters of the inner extensions 43a and 43b of the stress cones 4a and 4b.
  • the inner diameter of the thick portions 12a and 12b of the insulator 10a is substantially the same.
  • semiconductive adhesives 6a and 6b for example, semiconductive rubber paste-like adhesives and silanes, only in the concave grooves 23a and 23b of the metal fittings 2a and 2b.
  • a primer for vulcanization adhesion mainly composed of a coupling agent is applied, and in this state, the inner extensions 43a of the pair of stress cones 4a and 4b molded in advance as shown in FIG.
  • the first cylindrical portions 21a and 21b of the metal fittings 2a and 2b are mounted in 43b.
  • the inner peripheral surfaces of the inner extensions 43a and 43b excluding the protrusions 44a and 44b of the stress cones 4a and 4b are the first excluding the grooves 23a and 23b of the metal fittings 2a and 2b. It adheres to the outer peripheral surface of 1 cylindrical part 21a, 21b in a non-adhesive state. Further, the protrusions 44a and 44b provided on the inner peripheral surfaces of the inner extensions 43a and 43b of the stress cones 4a and 4b are fitted into the concave grooves 23a and 23b, and the protrusions of the stress cones 4a and 4b at the fitting parts. Only the portions 44a and 44b are integrated with the metal fittings 2a and 2b in a stronger adhesive state. As a result, only the inner periphery on the end side of the pair of stress cones 4a and 4b is more firmly fixed to the metal fittings 2a and 2b, and the detachment from the metal fittings 2a and 2b is prevented.
  • adhesives 7a and 7b similar to the semiconductive adhesives 6a and 6b are applied to the outer circumferences of the second cylindrical portions 22a and 22b constituting the metal fittings 2a and 2b. Apply. Then, the stress cones 4a and 4b with the pair of metal fittings 2a and 2b and the preliminarily molded internal semiconductor 3 thus obtained are set in a mold, and the pair of stress cones 4a and 4b and the internal semiconductivity are set.
  • an insulating rubber such as a silicone rubber material between the bodies 3 to form a main insulator 10a and vulcanizing it, as shown in FIG.
  • the main insulator 10a, the internal semiconductor 3 and a pair of The stress cones 4a and 4b are integrated.
  • the inner peripheral surfaces of the thick portions 12a and 12b are integrated with the outer peripheral surfaces of the metal fittings 2a and 2b through the adhesives 7a and 7b.
  • reference numeral 5 denotes an external semiconductor composed of a semiconductive paint coating layer provided on the outer periphery of the main insulator 10a.
  • the rubber unit Ua having such a configuration, as will be described later, a large clamping force can be generated in the vicinity of the mounting portion of the stress cones 4a and 4b with the cable insulators 81a and 81b.
  • the surface pressure can be applied intensively to the portion of the rising portion 4b where the electric field strength is high, and the surface pressure distribution can be matched to the electric field strength distribution as much as possible, and a small diameter difference (1.5-2)
  • the rubber unit Ua of about 0.0 mm
  • FIG. 3 is a partial cross-sectional view of an intermediate connection portion of a 110 to 132 kV class high voltage CV cable using the rubber unit Ua of the present invention.
  • parts common to those in FIG. 1 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the intermediate connection portion of the high voltage CV cable as the cable connection portion of the present invention is formed as follows. First, a pair of high-voltage CV cables to be connected are stepped to expose cable insulators 81a and 81b and cable conductors (not shown). Then, the exposed cable conductor is connected by the conductor connector 82 to obtain the conductor connecting portion 83 of the high-voltage CV cable. Therefore, the rubber unit Ua according to the present invention that has been fitted and inserted in advance on one of the cable insulators 81a and 81b is brought into a normal position, that is, the contact in which the central portion of the rubber unit Ua corresponds to the central portion of the conductor connecting portion 83. Slide to the desired position.
  • the rubber unit Ua before assembly shown in FIG. 4A is mounted on the outer periphery of the cable insulators 81a and 81b as shown in FIG. As a result, a tightening force is generated toward the central direction as a whole.
  • the insulating cylinder 1a constituting the rubber unit Ua is formed by mounting the rubber unit Ua with a diameter increased at a normal position.
  • Is constrained by the bonding portions with the metal fittings 2a and 2b, and the non-bonding portions on the inner peripheral surfaces of the inner extensions 43a and 43b of the stress cones 4a and 4b are the outer circumferences of the first cylindrical portions 21a and 21b of the metal fittings 2a and 2b.
  • the diameter is increased radially outward from the surface.
  • a large tightening force is generated in the vicinity of the mounting portion of the stress cones 4a and 4b with the cable insulators 81a and 81b, and the electric field strength at the rising portion of the stress cones 4a and 4b is high.
  • an intermediate connection portion of the high-pressure CV cable in which the surface pressure is controlled is obtained.
  • FIG. 5 shows an ideal surface pressure design pattern of the rubber unit Ua.
  • the left vertical axis represents the electric field (kV / mm)
  • the right vertical axis represents the surface pressure
  • the horizontal axis represents the position at the interface between the insulating cylinder 1a and the cable insulator 81b
  • the solid line represents the electric field strength distribution
  • the broken line represents the surface. The pressure distribution is shown.
  • the electric field strength at the interface between the insulating cylinder 1a and the cable insulator 81b is highest at the rising portion of the stress cone 4b, and it is ideal that the surface pressure distribution matches the electric field strength distribution as much as possible.
  • the surface pressure of the rubber unit Ua can be reduced by adopting such a surface pressure design.
  • the surface pressure distribution matches the electric field strength distribution as much as possible, and the entire rubber unit Ua
  • the rubber unit Ua can be slid.
  • the so-called self-compression type slide type can be used to ensure stable insulation.
  • the rubber unit Ua designed with a small diameter difference can be slid to easily insert the rubber unit Ua into the cable insulator 81b.
  • the intermediate connection portion of the high-pressure CV cable can be assembled by a self-compression slide type, a diameter-enlarged holding member such as a spiral core is not necessary, and the cost can be reduced.
  • FIG. 6 is a longitudinal sectional view of a rubber unit of the present invention suitable for a terminal connection part of a 220 kV class high voltage CV cable.
  • parts common to those in FIGS. 1 to 3 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the rubber unit Ub of the present invention includes an insulating cylinder 1b formed of an elastic material, for example, a silicone rubber material, and a low-pressure side end (lower part in the figure) of the insulating cylinder 1b that is integrated with the insulating cylinder 1b. And a cylindrical metal fitting 2c.
  • the insulating cylinder 1b includes a cylindrical main insulator 10b.
  • a cylindrical outer extension 11c extending toward the metal fitting 2c is mainly provided on the outer peripheral edge of the low-pressure side end of the main insulator 10b. It is connected to the insulator 10b concentrically.
  • An annular thick portion 12c is provided on the inner peripheral surface side of the end portion of the outer extension portion 11c so that the inner peripheral surface thereof can be attached to the outer peripheral surface of the metal fitting 2c described later.
  • the outer peripheral surface of the cylindrical main insulator 10b and the outer peripheral surface of the cylindrical outer extension portion 11c are formed to be flush with each other, and the inner peripheral surface of the annular thick portion 12c will be described later.
  • the outer periphery of the high-pressure side end (upper part in the drawing) of the main insulator 10b as the insulating cylinder 1b is provided with a cone-shaped outer surface 13c that gradually decreases in diameter toward the high-pressure side end.
  • a tulip-shaped recess 14c having an inner surface that gradually increases in diameter from the vicinity of the high-pressure side end toward the high-pressure side end is a main insulator 10b as an insulating cylinder 1b. And is concentric.
  • the inner peripheral surface of the stress cone 4c is formed to be flush with the inner peripheral surface of the main insulator 10b.
  • the stress cone 4c has an electric field relaxation portion 41c having a tapered inner peripheral surface that expands in a trumpet shape toward the outer periphery of the central portion of the main insulator 10b, and a thick cylindrical portion 42c on the side facing the metal fitting 2c.
  • An annular inner extension 43c that can be attached to the outer peripheral surface of the metal fitting 2c is provided on the side of the cylindrical portion 42c that faces the metal fitting 2c.
  • An annular protrusion 44c is provided on the inner periphery of the end of the inner extension 43c on the side facing the metal fitting 2c.
  • the length of the outer extension portion 11c in the axial direction is about twice the length of the inner extension portion 43c in the axial direction.
  • the metal fitting 2c is formed of aluminum or the like, and a first cylinder portion 21c for attaching the inner peripheral surface of the inner extension portion 43c of the stress cone 4c and a second cylinder for attaching the inner peripheral surface of the outer extension portion 11c.
  • the second cylindrical portion 22c is concentrically connected to the first cylindrical portion 21c at the end opposite to the end facing the stress cone 4c of the first cylindrical portion 21c.
  • a flange portion 26 is continuously provided outwardly in the radial direction at the end portion of the second cylindrical portion 22c opposite to the end portion facing the stress cone 4c.
  • an annular groove 23c is provided on the outer peripheral surface of the first cylindrical portion 21c in the vicinity of the second cylindrical portion 22c.
  • the inner diameter of the metal fitting 2c is larger than the outer diameter of the cable insulator 81c, which will be described later, and the outer diameter of the portion to be attached to the insulating cylinder 1b of the metal fitting 2c is the inner diameter of the inner extension 43c of the stress cone 4c and the main insulation.
  • the inner diameter of the thick portion 12c of the body 10b is substantially the same.
  • the main insulator 10b, the stress cone 4c, and the metal fitting 2c as the insulating cylinder 1b having such a configuration are integrated in the same manner as in the first embodiment.
  • the rubber unit Ub of the present invention has the following effects.
  • a large clamping force can be generated in the vicinity of the attachment portion of the stress cone 4c to the cable insulator 81c, and the electric field strength at the rising portion of the stress cone 4c is high.
  • a rubber unit Ub with a small diameter difference (about 1.5 to 2.0 mm) can be designed so that the surface pressure can be intensively applied and the surface pressure distribution can be matched to the electric field strength distribution as much as possible. By doing so, it is possible to reduce the tightening force of the entire rubber unit Ub.
  • a tulip-shaped recess 14c is provided on the inner peripheral edge of the high-pressure end of the main insulator 10b as the insulating cylinder 1b, so that the high-pressure side of the main insulator 10b as the insulating cylinder 1b is provided.
  • Electric field concentration at the triple junction (triple junction) P of the insulating fluid 98 (see FIG. 7), the main insulator 10b as the insulating cylinder 1b, and the cable insulator 81c (see FIG. 7) at the end can be prevented.
  • FIG. 7 is a partial cross-sectional view of a terminal connection portion of a 220 kV class high voltage CV cable using the rubber unit Ub of the present invention.
  • parts common to those in FIG. 6 are denoted by the same reference numerals, and detailed description thereof is omitted.
  • the rubber unit Ub having such a configuration is mounted on the outer periphery of the cable insulator 81c with the metal fitting 2c constituting the rubber unit Ub facing the cylindrical adapter 93, and the metal fitting 2c includes the fixing metal 94 and the O-ring 95. And is fixed to a flange portion 93 a on the high pressure side of the adapter 93.
  • the rubber unit Ub having such a configuration is assembled as a terminal connection portion of a high-voltage CV cable as follows.
  • an annular lower metal fitting 91 is fixed in the vicinity of the end of a cable sheath (not shown) of the cable terminal portion 9 via a support insulator 97 or the like.
  • the rubber unit Ub is attached to the outer periphery of the cable insulator 81c from its upper end.
  • the metal fitting 2c of the rubber unit Ub is mounted toward the adapter 93 side, the lower surface of the metal fitting 2c is brought into contact with the upper surface of the flange portion 93a on the high pressure side of the adapter 93 via the O-ring 95, and the fixing metal fitting 94 is attached.
  • the metal fitting 2c is fixed to the flange portion 93a by covering the upper surface of the flange portion 93a of the metal fitting 2c and fixing the adapter 93 and the fixing metal piece 94 with bolts. Thereby, a seal part (oil stop part) is formed.
  • the cable terminal portion 9 is surrounded by the soot tube 92, the low-pressure side end portion is placed on the lower metal fitting 91, and both are fixed with bolts. Insulation of silicone oil, mineral oil, synthetic oil, etc. in the soot tube 92 Fill with fluid 98. Thereby, the electrical insulation performance of the space in the soot pipe 92 is ensured.
  • an upper metal fitting (not shown) is attached to the upper portion of the tub tube 92, and an anticorrosion layer (not shown) is formed on the low voltage side end of the cable terminal portion 9, thereby completing the assembly of the terminal connection portion of the high voltage CV cable. .
  • the rubber unit Ub in which the surface pressure distribution is matched to the electric field strength distribution as much as possible and the tightening force of the entire rubber unit Ub is reduced, that is, By using the rubber unit Ub designed with a small diameter difference (about 1.5 to 2.0 mm), stable insulation can be ensured even in a so-called self-compression slide type in which the rubber unit Ub is slid. .
  • the rubber unit Ub can be easily inserted into the cable insulator 81c by sliding the rubber unit Ub designed with a small diameter difference.
  • the terminal connection portion of the high-pressure CV cable can be assembled by a self-compression slide type, a diameter expansion holding member such as a spiral core becomes unnecessary, and the cost can be reduced.
  • the fitting 2c of the rubber unit Ub is mounted toward the lower fitting 91, and the fitting 2c is fixed to the flange 93a on the high-pressure side of the adapter 93 via the O-ring 95, so that the conventional seal portion
  • the number of parts can be reduced as compared with the (oil stopper), and the sealing performance of the seal portion (oil stopper) can be greatly improved.
  • the seal structure by the O-ring 95 can greatly improve the reliability of the seal portion.
  • the metal fitting 2c of the rubber unit Ub is fixed to the adapter 93 via the O-ring 95.
  • the metal fitting 2c of the rubber unit Ub via the O-ring 95 is used. You may fix to the lower metal fitting 91.
  • FIG. 8 is an exploded cross-sectional view of a rubber unit according to another embodiment of the present invention.
  • the same reference numerals are given to portions common to FIGS. 2 and 6, and detailed description thereof is omitted.
  • the inner peripheral surfaces of the inner extensions 43d and 43e are annular. Stress cones 4d and 4e provided with concave grooves 44d and 44e are used. Instead of the metal fittings 2a, 2b and 2c having the concave grooves 23a, 23b and 23c shown in FIGS. Metal fittings 2d and 2e provided with portions 23d and 23e are used.
  • the first cylindrical portions 21a and 21b of the metal fittings 2d and 2e in which the semiconductive adhesives 6a and 6b are applied only to the protrusions 23d and 23e by the same method as in the first embodiment are shown in FIG.
  • the inner extensions excluding the concave grooves 44d and 44e of the stress cones 4d and 4e can be mounted in the inner extensions 43d and 43e of the stress cones 4d and 4e shown in FIG.
  • the inner peripheral surfaces of 43d and 43e can be attached to the outer peripheral surfaces of the first cylindrical portions 21a and 21b excluding the projections 23d and 23e of the metal fittings 2d and 2e in an unbonded state.
  • the protrusions 23d and 23e of 2e are fitted into the concave grooves 44d and 44e of the stress cones 4d and 4e, and only the concave grooves 44d and 44e of the stress cones 4d and 4e are stronger in the fittings 2d and 2e.
  • the stress cones 4d and 4e with the pair of metal fittings 2d and 2e, the main insulator 10a (see FIG. 1), and the internal semiconductor 3 (see FIG. 1) having the above-described configuration are the same as those in the first embodiment. Is integrated.
  • a large tightening force is generated in the vicinity of the mounting portion of the stress cones 4d and 4e with the cable insulators 81a (see FIG. 3) and 81b (see FIG. 3).
  • the surface pressure can be applied intensively to the high electric field strength portions of the rising portions of the stress cones 4d and 4e, and the surface pressure distribution can be matched to the electric field strength distribution as much as possible.
  • a rubber unit with a diameter difference about 1.5 to 2.0 mm
  • the stress cone 4c can be configured as a rubber unit in which an annular concave groove is provided, and the metal fitting 2c is provided with an annular protrusion. Is obtained.
  • FIG. 9 is an exploded cross-sectional view of a rubber unit according to another embodiment of the present invention.
  • the same reference numerals are given to portions common to FIGS. 2 and 6, and detailed description thereof is omitted.
  • the inner peripheral surfaces of the inner extensions 43f and 43g are smooth. That is, the stress cones 4f and 4g in which no protrusions or grooves are formed on the inner peripheral surfaces of the inner extensions 43f and 43g are used, and the metal fitting 2a having the grooves 23a, 23b, and 23c shown in FIGS. Instead of 2b and 2c, metal fittings 2f and 2g having a smooth outer peripheral surface, that is, having no concave grooves or protrusions on the outer peripheral surface, are used.
  • semiconductive adhesion is performed only on the outer peripheral surface at a predetermined location (the outer peripheral surface at the position corresponding to the concave grooves 23a, 23b, and 23c shown in FIGS. 2 and 6).
  • the first cylindrical portions 21a and 21b of the metal fittings 2f and 2g coated with the agents 6a and 6b are mounted in the inner extensions 43f and 43g of the stress cones 4f and 4g shown in FIG.
  • the inner peripheral surfaces of the inner extensions 43f and 43g excluding a predetermined portion of the stress cones 4f and 4g are attached to the metal fitting 2d.
  • the pair of fittings 2f, 2g with stress cones 4f, 4g, the main insulator 10a (see FIG. 1) and the internal semiconductor 3 (see FIG. 1) having the above-described configuration are the same as those in the first embodiment. Is integrated.
  • a large tightening force is generated in the vicinity of the mounting portion between the stress cones 4f and 4g and the cable insulators 81a (see FIG. 3) and 81b (see FIG. 3).
  • the surface pressure can be applied intensively to the high electric field strength portions of the rising portions of the stress cones 4f and 4g, and the surface pressure distribution can be matched to the electric field strength distribution as much as possible.
  • a rubber unit having a diameter difference about 1.5 to 2.0 mm
  • the outer extensions 11a, 11b, and 11c are formed of an insulating elastic material, but are formed of a semiconductive elastic material similar to the stress cones 4a, 4b, and 4c. May be. That is, as shown in FIG. 10, the cylindrical stress cone 4h is provided at the end facing the metal fittings 2a, 2b, 2c of the insulating cylinders 1a, 1b, and the outer peripheral surface of the cylindrical cylinder is itself the outer peripheral surface of the insulating cylinders 1a, 1b.
  • An annular ring that can be embedded concentrically with the insulating cylinders 1a and 1b so as to be attached to the outer peripheral surface of the metal fittings 2a, 2b, and 2c at the end of the stress cone 4h facing the metal fittings 2a, 2b, and 2c.
  • the inner peripheral surface located on the end side opposite to the end facing the stress cone 4h among the inner peripheral surfaces of these concave portions is the second cylindrical portion 22a, 22b, 22c.
  • the inner peripheral surface which is integrally bonded to the outer peripheral surface and is located on the end side facing the stress cone 4h of the inner peripheral surface of the recessed portion is a part of the first cylindrical portion 21a, 21b, 21c.
  • Non-adhesive to the outer peripheral surface excluding the protrusions (Fig. 10) In may be configured to deposit.
  • the stress cones 4a, 4b, and 4c are formed of a semiconductive elastic material.
  • the stress cones 4a, 4b, and 4c are formed of an insulating elastic material as shown by a broken line in FIG.
  • semiconductive paint may be applied to the entire peripheral surface of itself or the inner peripheral surface of the inner extensions 43a, 43b, 43c and the entire peripheral surface excluding the end surface 42d facing the metal fittings 2a, 2b, 2c. That is, the cable shielding side and the metal fittings 2a, 2b, and 2c may be electrically connected.
  • the metal fitting is not limited to one made of aluminum, and may be made of, for example, copper, copper alloy, or aluminum alloy.
  • the outer diameters of the first cylindrical portions 21a, 21b, and 21c and the second cylindrical portions 22a, 22b, and 22c are the same, but the first cylindrical portions 21a, The outer diameters of 21b and 21c may be different from the outer diameters of the second cylindrical portions 22a, 22b and 22c.
  • the present invention is applied to the air termination connection portion.
  • the present invention may be applied to a gas termination connection portion or an oil termination connection portion.
  • the intermediate connection portion with the applied voltage of 110 to 132 kV class and the air termination connection portion with the 220 kV class are described, but the present invention is not limited to these voltages.

Landscapes

  • Cable Accessories (AREA)

Abstract

Des garnitures métalliques (2a, 2b) comprennent des premières sections de tube circulaire (21a, 21b) et des secondes sections de tube circulaire (22a, 22b) placées contiguës aux premières sections de tube circulaire (21a, 21b) suivant une relation coaxiale et situées chacune à l'extrémité de la première section de tube circulaire (21a, 21b) qui se trouve sur le côté opposé à cette extrémité de la première section de tube circulaire (21a, 21b) située en face d'un cône de contrainte (4a, 4b). Des sections tubulaires circulaires s'étendant à l'extérieur (11a, 11b) qui s'étendent en direction des secondes sections de tube circulaire (22a, 22b) et comportant des surfaces périphériques internes pouvant recouvrir et entrer en contact avec les surfaces périphériques externes des secondes sections de tube circulaire (22a, 22b) sont disposées au niveau des extrémités d'un tube isolant (1a) qui se trouvent en face des garnitures métalliques (2a, 2b). Des sections tubulaires circulaires s'étendant à l'intérieur (43a, 43b) s'étendant en direction des premières sections de tube circulaire (21a, 21b) et comportant des surfaces périphériques internes pouvant recouvrir et entrer en contact avec les surfaces périphériques externes des premières sections de tube circulaire (21a, 21b) sont disposées au niveau des extrémités des cônes de contrainte (4a, 4b) qui se situent en face des garnitures métalliques (2a, 2b). Les surfaces périphériques internes des sections s'étendant à l'extérieur (11a, 11b) sont entièrement liées aux surfaces périphériques externes des secondes sections tubulaires (22a, 22b) et les surfaces périphériques internes des sections s'étendant à l'intérieur sont réalisées de manière à recouvrir les surfaces périphériques externes des premières sections de tube circulaire (21a, 21b) sans collage.
PCT/JP2009/001582 2008-04-08 2009-04-06 Unité en caoutchouc et partie de raccordement de câble utilisant ladite unité en caoutchouc WO2009125568A1 (fr)

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JP2008-100797 2008-04-08
JP2008100797 2008-04-08
JP2009072097A JP4801182B2 (ja) 2008-04-08 2009-03-24 ゴムユニットおよびこれを用いたケーブル接続部
JP2009-072097 2009-03-24

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WO2011033849A1 (fr) * 2009-09-15 2011-03-24 三菱電機株式会社 Dispositif générateur de plasma
WO2011144253A2 (fr) * 2010-05-21 2011-11-24 Abb Research Ltd Appareil de terminaison de câble pour courant continu à haute tension
CN102882179A (zh) * 2012-10-24 2013-01-16 陶柏洪 26/35kV或27.5kV硅橡胶冷缩式直通接头
CN107144774A (zh) * 2017-06-16 2017-09-08 广东长牛电气股份有限公司 一种电缆终端测试装置

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JP5970006B2 (ja) * 2014-01-30 2016-08-17 昭和電線ケーブルシステム株式会社 電力ケーブルの接続部形成装置及び電力ケーブルの接続部形成方法
CN106961091A (zh) * 2016-01-11 2017-07-18 泰科电子(上海)有限公司 电力电缆终端
JP6823941B2 (ja) * 2016-04-28 2021-02-03 スリーエム イノベイティブ プロパティズ カンパニー ケーブルの分岐構造、及び被覆処理具

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JPH11234885A (ja) * 1998-02-12 1999-08-27 Hitachi Cable Ltd 直線接続部
JP2007159271A (ja) * 2005-12-05 2007-06-21 Viscas Corp 電力ケーブル終端接続装置

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JPH10117426A (ja) * 1996-10-11 1998-05-06 Sumitomo Electric Ind Ltd プラスチック電力ケーブルの接続部
JPH11234885A (ja) * 1998-02-12 1999-08-27 Hitachi Cable Ltd 直線接続部
JP2007159271A (ja) * 2005-12-05 2007-06-21 Viscas Corp 電力ケーブル終端接続装置

Cited By (7)

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Publication number Priority date Publication date Assignee Title
WO2011033849A1 (fr) * 2009-09-15 2011-03-24 三菱電機株式会社 Dispositif générateur de plasma
JP5456049B2 (ja) * 2009-09-15 2014-03-26 三菱電機株式会社 プラズマ生成装置
WO2011144253A2 (fr) * 2010-05-21 2011-11-24 Abb Research Ltd Appareil de terminaison de câble pour courant continu à haute tension
WO2011144253A3 (fr) * 2010-05-21 2012-05-03 Abb Research Ltd Appareil de terminaison de câble pour courant continu à haute tension
US8946552B2 (en) 2010-05-21 2015-02-03 Abb Research Ltd. High voltage direct current cable termination apparatus
CN102882179A (zh) * 2012-10-24 2013-01-16 陶柏洪 26/35kV或27.5kV硅橡胶冷缩式直通接头
CN107144774A (zh) * 2017-06-16 2017-09-08 广东长牛电气股份有限公司 一种电缆终端测试装置

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