JP2017060241A - Polymer connection portion for power cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a polymer connection portion for a power cable that is lighter as compared with a case where a porcelain insulator is used, can demonstrate a self-standing property to maintain its posture even when it is used in a horizontal posture, and can be enhanced in freedom of installation.SOLUTION: A polymer connection portion for a power cable includes a polymeric porcelain tube having a cable insertion hole into which the end of a stripped power cable is inserted, the polymeric porcelain tube includes an insulator made of a polymer material, a metallic buried pipe which is embedded in an inner peripheral surface of the insulator so as to face an end of the power cable, and a flange structure. The flange structure includes a metallic buried flange which is buried in the outer peripheral surface side of the insulator so that a first fitting surface is exposed from the insulator, and an external flange having a second fitting surface which is fitted to the first fitting surface, protrudes outwards in the radial direction of the polymeric porcelain insulator beyond the buried flange, and fitted to another member.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a polymer connecting portion for a power cable using a polymer pipe.

  Conventional insulator-type self-supporting dry-type termination terminations are made of porcelain insulators that are relatively heavy, and therefore, self-supporting dry-type termination terminations that are lighter than porcelain insulators have been proposed (for example, patents) Reference 1).

  This self-supporting dry-type termination connection portion extends in the axial direction into a flexible rubber insulating layer having a cable insertion hole into which an end portion of the cable is inserted, and an intermediate thickness of the insulating layer. And a self-supporting resin tube having electrical insulation and rigidity provided integrally with the insulating layer.

  According to this structure, the termination | terminus connection part can be reduced in weight by using a resin pipe | tube as a lightweight rubber insulating layer and a core material. In addition, by using the resin tube as a core material, it is possible to exhibit the self-supporting ability to maintain a vertical standing posture. Therefore, the installation work to the utility pole becomes easy.

Japanese Patent No. 5060800

  However, according to the conventional self-supporting dry terminal connection portion, since the self-supporting resin tube as the core material is made of resin, when the connection portion is used in a horizontal posture, the horizontal posture is maintained by itself. The resin tube is not sufficient as a core material because the tip side hangs down.

  Accordingly, an object of the present invention is a polymer for a power cable that is lighter than the case of using a porcelain insulator and can exhibit the independence of maintaining the posture even when used in a horizontal posture. To provide a connection.

  Moreover, it is preferable that the power cable polymer connecting portion that is lightweight and excellent in self-supporting property as described above can be attached to various places and can be easily attached.

  Then, the other object of this invention is to provide the polymer connection part for electric power cables which was lightweight and excellent in independence, and also the freedom degree of attachment was raised.

  In order to solve the above-described problems, the present invention includes a polymer soot tube having a cable insertion hole into which an end portion of a stepped power cable is inserted, and the polymer soot tube is an insulating material formed from a polymer-based material. And a metal embedded pipe embedded in the inner peripheral surface of the insulator so as to face the end of the power cable, and a flange structure, the flange structure having a first mounting surface A metal embedded flange embedded on the outer peripheral surface side of the insulator so as to be exposed from the insulator, and attached to the first mounting surface, and radially outward of the polymer soot tube than the embedded flange And an external flange having a second attachment surface attached to another member. The polymer connection portion for a power cable is provided.

  According to the present invention, it is lighter than the case of using a porcelain insulator, and it is possible to exhibit the independence of maintaining the posture even when used in a horizontal posture. Moreover, the freedom degree of attachment to another member is raised by the flange structure provided with an external flange.

FIG. 1 is a longitudinal sectional view showing a configuration example of a polymer connecting portion for a power cable according to the first embodiment of the present invention. 2 is a cross-sectional view of the power cable shown in FIG. FIG. 3 is a plan view of a principal part showing an example of a structure for attaching a polymer connecting portion for a power cable according to the second embodiment of the present invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in each figure, about the component which has the substantially same function, the same code | symbol is attached | subjected and the duplicate description is abbreviate | omitted.

[First Embodiment]
FIG. 1 is a longitudinal sectional view showing a configuration example of a polymer connecting portion for a power cable according to the first embodiment of the present invention. 2 is a cross-sectional view of the power cable shown in FIG.

  This polymer connecting portion 1 for a power cable is formed mainly from a polymer material (insulating polymer material), and has a polymer insertion tube 2a and 2b having cable insertion holes 2a and 2b into which an end 101 of the stepped power cable 100 is inserted. 2, a protective metal fitting 3 that protects the rear end side (opposite to the insertion direction A) B of the polymer rod 2, a conductor connecting rod 4 connected to the conductor 120 of the power cable 100, and the conductor connecting rod 4 are attached. A fixed terminal 5, a high-voltage shield 6 connected to the conductor connecting rod 4 through the fixed terminal 5, and a waterproof processing unit 7 that seals between the protective metal fitting 3 and the power cable 100 are provided.

(Configuration of polymer soot tube)
The polymer soot tube 2 includes a flexible insulator 20 formed of a polymer-based material, and a reinforcement embedded on the inner peripheral surface of the insulator 20 so as to face the insulating layer 140 of the end portion 101 of the power cable 100. A metal embedded pipe 21 as a member or core material, a reinforcing member embedded in the outer peripheral surface side of the insulator 20 or a metal embedded flange 22 as a core material, and an outside attached to the embedded flange 22 A flange structure 25 having a flange 24, a first semiconductive portion 23A for relaxing the electric field at the end 101 of the power cable 100, a second semiconductive portion 23B for relaxing the electric field in the embedded pipe 21, A third semiconductive portion 23C that relaxes the electric field in the insert flange 22. Further, the insulator 20, the embedded pipe 21, the embedded flange 22, and the first to third semiconductive portions 23A to 23C constituting the polymer soot tube 2 are integrally formed by molding at the factory. Here, the insulator 20 and the first to third semiconductive portions 23A to 23C are examples of an insulating protective layer.

  On the outer periphery of the insulator 20, a plurality of umbrella portions 20a are formed at regular intervals. The insulator 20 is made of, for example, silicone rubber, ethylene propylene rubber (EPM), ethylene propylene diene rubber (EPDM) or the like as a polymer material.

  The first cable insertion hole 2a on the side B opposite to the insertion direction A of the insulating protective layer is from the end 101 of the power cable 100, that is, the outer diameter D1 of the insulating layer 140 before the end 101 of the power cable 100 is inserted. Has a small inner diameter, and when the insulating layer 140 of the power cable 100 is inserted, it is in close contact with the insulating layer 140.

  The embedded pipe 21 is made of a metal such as brass or aluminum alloy, for example. The embedded pipe 21 has, for example, an outer diameter of 30 to 50 mm and a thickness of 2 to 5 mm. In order to facilitate insertion of the power cable 100, the embedded pipe 21 has a second cable insertion hole 2b having an inner diameter D2 that is larger than the outer diameter of the insulating layer 140. Since the outer peripheral surface of the embedded pipe 21 is covered with the second semiconductive portion 23 </ b> B, a commercially available embedded pipe 21 can be used. Note that the second semiconductive portion 23B can be omitted by making the outer peripheral surface of the embedded pipe 21 a smooth surface (for example, the arithmetic average roughness Ra is 6.3 μm or less).

  The embedded pipe 21 has a portion 21a whose end in the insertion direction A is exposed from the insulator 20 in the cable axial direction, and this exposed portion 21a is connected to the high-voltage shield 6 as a connecting member. The high-voltage shield 6 is connected to the conductor 120 of the power cable 100 through the fixed terminal 5 and the conductor connecting rod 4. Thereby, the embedded pipe 21 exhibits a shielding effect. That is, in the case where the embedded pipe 21 is not embedded in the inner peripheral surface of the insulator 20, it is necessary to fill the space between the power cable 100 and the insulating layer 140 with an insulating compound in order to suppress dielectric breakdown. is there. On the other hand, in this embodiment, since the embedded pipe 21 is embedded in the inner peripheral surface of the insulator 20 and the embedded pipe 21 is connected to the conductor 120 of the power cable 100, the embedded pipe 21 and the insulating layer The space between the buried pipe 21 and the insulating layer 140 need not be filled with a compound.

  The embedded flange 22 includes a cylindrical portion 22a having a cylindrical shape, and a flange portion 22b provided over the entire outer periphery of the cylindrical portion 22a. The embedded flange 22 is embedded on the outer peripheral surface side of the insulator 20 so that a mounting surface 22c to which the external flange 24 or the like is attached is exposed from the insulator 20. A female screw 22d is formed on the attachment surface 22c, and the external flange 24 and the like can be attached to the embedded flange 22 by a bolt 30. Such an embedded flange 22 is made of, for example, a metal such as brass or an aluminum alloy, and is connected to the ground in use.

  The external flange 24 is a member in which an insertion hole for inserting the insulator 20 and the protective metal fitting 3 is formed at the center, and has a disk shape, for example. An insertion hole 24a for inserting the bolt 30 is formed at a position corresponding to the internal thread 22d formed on the mounting surface 22c of the embedded flange 22 in the inner peripheral side portion of the external flange 24. 24 is attached to the attachment surface 22c of the embedded flange 22 by a bolt 30.

  The external flange 24 has a shape projecting outward in the radial direction of the polymer rod tube 2 from the embedded flange 22, that is, the outer peripheral side, and the projecting portion on the outer peripheral side serves as another member such as a casing. A mounting surface 24b to be mounted is configured. The attachment surface 24 b is formed with an insertion hole 24 c for inserting the bolt 50, and is configured such that the external flange 24 can be attached to the housing or the like by the bolt 50. The external flange 24 is made of, for example, a metal such as brass or an aluminum alloy, and is connected to the ground when in use.

  If necessary, the external flange 24 can be detached from the embedded flange 22 and the mounting surface 22c of the embedded flange 22 can be attached to the housing or the like with the bolt 30.

  The first to third semiconductive portions 23A to 23C are mainly formed of a polymer material. That is, the first to third semiconductive portions 23A to 23C are made by extruding a polymer material obtained by dispersing conductive powder such as carbon in silicone rubber, EPM, EPDM or the like. It is formed by doing.

  The first semiconductive portion 23A has an inner diameter smaller than the outer diameter D1 of the insulating layer 140 before the end portion 101 of the power cable 100 is inserted. The second semiconductive portion 23B covers the outer peripheral surface of the embedded pipe 21 except for the end portion on the insertion method A side. The third semiconductive portion 23C covers the surface of the embedded flange 22 that is not exposed from the insulator 20.

(Other configurations)
The protective metal fitting 3 is made of, for example, a metal such as brass or an aluminum alloy, and is configured to be attached to the attachment surface 22c of the embedded flange 22 together with the external flange 24 by a bolt 30.

  The conductor connecting rod 4 has a connection hole 4a formed on the rear end side and a male screw 4b formed on the front end side. By inserting the conductor 120 of the power cable 100 into the connection hole 4a of the conductor connection rod 4 and caulking the rear end side of the conductor connection rod 4, the diameter of the connection hole 4a is reduced, and the conductor connection rod 4 and the conductor of the power cable 100 120 is connected.

  The fixed terminal 5 is formed with an insertion hole 5a for inserting the conductor connecting rod 4 and a connection hole 5b to which an electric wire is connected. The fixed terminal 5 is attached to the conductor connecting rod 4 by inserting the conductor connecting rod 4 through the insertion hole 5a and fastening the nut 40 to the male screw 4b.

  The high-voltage shield 6 has a cylindrical shape that covers the periphery of the conductor connecting rod 4 and is made of metal. The high-voltage shield 6 connects the embedded pipe 21 to the fixed terminal 5 to shield the conductor connecting rod 4.

  The waterproof processing part 7 is formed by winding a member having good water resistance, such as a polyethylene tape or an epoxy tape with an adhesive layer.

(Configuration of power cable)
The power cable 100 includes a conductor 120 made of stranded wire, an inner semiconductive layer 130 formed on the outer periphery of the conductor 120, an insulating layer 140 formed on the outer periphery of the inner semiconductive layer 130, and an outer periphery of the insulating layer 140. The formed outer semiconductive layer 150, the shielding layer 170 formed by winding the wire 171 around the outer periphery of the outer semiconductive layer 150, and the pressing tape layer 180 formed by winding the pressing tape 181 around the outer periphery of the shielding layer 170. And a sheath layer 190 formed on the outer periphery of the presser tape layer 180.

  The conductor 120 is formed by twisting a plurality of strands. As an element wire, wire materials, such as a tin plating annealed copper wire, can be used, for example. The conductor 120 transmits a high voltage of, for example, 7000 V or higher.

  The inner semiconductive layer 130 and the outer semiconductive layer 150 are provided to alleviate electric field concentration, and are mainly formed of a polymer material, such as ethylene propylene rubber, ethylene-vinyl acetate copolymer (EVA) resin. It is formed by extruding a conductive material such as carbon dispersed in rubber such as butyl rubber to give conductivity.

  The insulating layer 140 is formed, for example, by extruding a material such as ethylene propylene rubber, vinyl chloride, cross-linked polyethylene, silicone rubber, or a fluorine-based material.

  The shielding layer 170 is formed by winding a wire 171 around the outer periphery of the outer semiconductive layer 150 in a spiral shape along the cable axial direction. The shielding layer 170 is connected to the ground in use.

  The presser tape layer 180 is formed by spirally winding the presser tape 181 around the outer periphery of the shielding layer 170 along the cable axial direction. As the pressing tape 181, for example, a tape made of plastic or rayon having a thickness of 0.03 to 0.5 mm and a width of 50 to 90 mm can be used.

  The sheath layer 190 is, for example, natural rubber, butyl rubber, halogenated butyl rubber, ethylene propylene rubber, chloroprene rubber, styrene butadiene rubber, nitrile rubber, chlorosulfonated polyethylene, chlorinated polyethylene, epichlorovidrin rubber, acrylic rubber, silicone rubber. It is formed by extruding a rubber such as fluorine rubber, urethane rubber, non-halogen polyolefin elastomer or the like to which a crosslinking agent or the like is added.

(Operation and effect of the first embodiment)
According to the present embodiment, the following operations and effects are achieved.
(1) When a polymer material that is lighter than porcelain is used as an insulator and a thin embedded pipe 21 is used as a reinforcing member, the polymer cable connection portion 1 for the power cable uses a porcelain insulator. It becomes lighter than.
(2) Since the metal embedded pipe 21 is embedded in the inner peripheral surface of the insulator 20, even when the power connection polymer connecting portion 1 is used in a horizontal posture, the horizontal posture is maintained. Independence can be demonstrated.
(3) Since the metal embedded flange 22 is embedded on the outer peripheral surface side of the insulator 20 in addition to the embedded pipe 21, even when the polymer cable connecting portion 1 for the power cable is used in a horizontal posture. Independence to maintain a horizontal posture can be demonstrated more.
(4) Since the outer peripheral surface of the embedded pipe 21 is covered with the second semiconductive portion 23B, even if the outer peripheral surface of the embedded pipe 21 is damaged, the concentration of the electric field can be reduced.
(5) Since the surface of the embedded flange 22 other than that exposed from the insulator 20 is covered with the third semiconductive portion 23C, the electric field is concentrated even if the surface of the embedded flange 22 is damaged. Can be relaxed.
(6) Since the embedded pipe 21 is connected to the conductor 120 of the power cable 100, the space between the embedded pipe 21 and the insulating layer 140 becomes a closed space, and the embedded pipe 21 and the insulating layer 140 There is no need to fill with a compound in between.
(7) By attaching the external flange 24 to the embedded flange 22, a flange structure 25 having two types of flanges can be formed. The power cable polymer connecting portion 1 can be used as an attachment portion to another member with the external flange 24 removed from the embedded flange 22 as necessary. However, when the embedded flange 22 is used as an attachment portion to another member, for example, it cannot be attached to a hole having a diameter larger than that of the embedded flange 22. By providing the embedded flange 22 with a flange structure 25 in which an external flange 24 having a diameter larger than that of the embedded flange 22 is provided, and using the external flange 24 as an attachment portion to another member, It can be installed in a large diameter hole. Moreover, as the external flange 24, those having an arbitrary shape or structure can be used according to the shape or structure of another member to which the power cable polymer connecting portion 1 is to be attached. Thus, by using the external flange 24, the degree of freedom in attaching the power cable polymer connecting portion 1 is increased as compared with the case where only the embedded flange 22 is used as an attaching portion to another member.

[Second Embodiment]
FIG. 3 is a plan view of a principal part showing an example of a structure for attaching a polymer connecting portion for a power cable according to the second embodiment of the present invention. The attachment structure according to the second embodiment is an example of a structure in which the power cable polymer connecting portion 1 according to the first embodiment is attached to a high-voltage equipment box 200 of a railway vehicle.

  In FIG. 3, the vertical direction of the paper surface indicates the front-rear direction of the vehicle, and the horizontal direction of the paper surface indicates the left-right direction of the vehicle. Although the high voltage | pressure equipment box 200 is arrange | positioned, for example under the floor of a vehicle, you may arrange | position in the other place. A vacuum circuit breaker (VCB) 201 or the like is disposed in the high voltage equipment box 200, and a transformer or the like is connected to the vacuum circuit breaker 201. The power cable polymer connecting portion 1 is attached to the housing 202 of the high voltage equipment box 200. The electric wire 8 is connected between the polymer connecting portion 1 for the power cable and the vacuum circuit breaker 201. The electric power from the pantograph is supplied to the vacuum circuit breaker 201 through the polymer connector 1 for the power cable.

  The power cable polymer connecting portion 1 is attached in a state of being inserted from the outside into an insertion hole 202 a formed in the side surface of the housing 202 of the high-voltage equipment box 200. In this example, the housing 202 has a shape in which one corner of the quadrangle is cut obliquely, and the power cable polymer connecting portion 1 is attached to the oblique side surface. That is, in this example, the power cable polymer connecting portion 1 is attached obliquely with respect to the longitudinal direction of the vehicle as the direction in the horizontal plane. Moreover, in this example, the polymer connection part 1 for electric power cables is attached with the horizontal attitude | position. In addition, the attachment position and attachment direction to the housing | casing 202 of the high voltage | pressure equipment box 200 of the polymer connection part 1 for electric power cables are not limited to these.

  The insertion hole 202 a formed on the side surface of the housing 202 has a larger diameter than the embedded flange 22 of the power cable polymer connecting portion 1 and a smaller diameter than the external flange 24. That is, the outer flange 24 is selected to have a shape larger than the insertion hole 202a. When the power cable polymer connecting portion 1 is inserted from the outside of the housing 202, the outer flange 24 is inserted into the insertion hole 202a. It is locked to the edge of the.

  On the outer side of the edge of the insertion hole 202 a on the side surface of the housing 202, a female screw 202 b is formed at a position corresponding to the insertion hole 24 c of the bolt 50 formed in the external flange 24. Are attached to the housing 202 by bolts 50. The housing 202 is made of metal and connected to the ground when in use.

(Operation and effect of the second embodiment)
According to the present embodiment, the following operations and effects are achieved.
(1) Since the power cable polymer connecting portion 1 is reduced in weight, the high voltage equipment box 200 to which the power cable polymer connecting portion 1 is attached can be reduced in weight.
(2) The power cable polymer connecting portion 1 is excellent in self-supporting property, and even when the power cable polymer connecting portion 1 is in a horizontal posture, the tip end side hardly hangs down. It can be used by being attached to the box 200 in a horizontal posture. Moreover, even if it is a horizontal attitude | position, the insulation distance from the bottom face of the housing | casing 202, a top | upper surface, etc. can be maintained constant because the shape of the polymer connection part 1 for electric power cables is maintained constant.
(3) By using the external flange 24, the power cable polymer connecting portion 1 can be attached to the hole 202 a having a diameter larger than that of the embedded flange 22, and the power cable polymer connecting portion 1 is connected to the high-voltage equipment box 200. Can be easily attached to the housing 202 from the outside.

  In addition, embodiment of this invention is not limited to said each embodiment, Various embodiment is possible. For example, although each said embodiment demonstrated the terminal connection part of the cable track | line, this invention is applicable also to the intermediate connection part of a cable track | line.

  Moreover, although the said 2nd Embodiment illustrated about the case where it uses by a horizontal attitude | position, the polymer connection part 1 for electric power cables is applicable also when using it by the diagonal attitude | position or a vertical attitude | position.

  Moreover, although the said 2nd Embodiment illustrated about the case where the polymer connection part 1 for electric power cables is attached to the high voltage | pressure apparatus box 200, the attachment place and attachment form of the polymer connection part 1 for electric power cables are not restrict | limited in particular. For example, you may attach on the roof of a vehicle in order to use for the connection of the electric wire between vehicles, and the connection of the electric wire to a pantograph.

  Further, it is possible to omit or change some of the constituent elements of the above-described embodiment within a range not changing the gist of the present invention. For example, in the above embodiment, the second semiconductive portion 23B may be omitted by making the outer peripheral surface of the embedded pipe 21 a smooth surface or a mirror surface. Further, in the above embodiment, the third semiconductive portion 23C may be omitted by making the surface of the embedded flange 22 a smooth surface or a mirror surface.

  Further, as in the second embodiment, when used in an environment that is not exposed to the outdoors, the insulator 20 of the polymer cable connection portion 1 for power cable is used as compared with the case where it is used in an environment exposed to the outdoors. Is hard to get dirty. In such a case, the number of umbrella parts of the insulator 20 may be reduced to reduce the size of the polymer connection part 1 for power cables.

  Moreover, the attachment part which attaches the protection metal fitting 3 to the embedding flange 22 is a flange shape so that it may illustrate in FIG. For this reason, it is good also as a form shared as the external flange 24 by changing the flange-shaped attachment part of the protective metal fitting 3 into a desired magnitude | size and shape.

1 ... polymer connection for power cable, 2 ... polymer pipe,
2a ... 1st cable insertion hole, 2b ... 2nd cable insertion hole,
3 ... Protective bracket, 4 ... Conductor connecting rod, 4a ... Connecting hole, 4b ... Male screw,
5 ... fixed terminal, 5a ... insertion hole, 5b ... connection hole, 6 ... high pressure shield,
7 ... Waterproofing part, 8 ... Wire,
20 ... Insulator, 20a ... Umbrella, 21 ... Embedded pipe,
22 ... Embedded flange, 22a ... Cylindrical part, 22b ... Gutter part, 22c ... Mounting surface,
22d ... female thread,
23A ... 1st semiconductive part, 23B ... 2nd semiconductive part, 23C ... 3rd semiconductive part,
24 ... external flange, 24a ... insertion hole, 24b ... mounting surface, 24c ... insertion hole,
25 ... Flange structure,
30 ... bolts, 40 ... nuts, 50 ... bolts,
DESCRIPTION OF SYMBOLS 100 ... Power cable, 120 ... Conductor, 130 ... Internal semiconductive layer, 140 ... Insulating layer,
150 ... outer semiconductive layer, 170 ... shielding layer, 171 ... wire, 180 ... tape layer,
181 ... tape, 190 ... sheath layer,
200 ... High pressure equipment box, 201 ... Vacuum circuit breaker,
202 ... Housing, 202a ... Insertion hole, 202b ... Female screw,
A ... Insertion direction, B ... Rear end side (opposite side)

Claims (1)

A polymer pipe having a cable insertion hole into which the end of the stepped power cable is inserted;
The polymer soot tube is
An insulator formed from a polymer-based material;
A metal embedded pipe embedded in the inner peripheral surface of the insulator so as to face the end of the power cable;
Flange structure,
With
The flange structure is
A metal embedded flange embedded on the outer peripheral surface side of the insulator so that the first mounting surface is exposed from the insulator;
An external flange that is attached to the first attachment surface, has a second attachment surface that extends radially outward of the polymer soot tube relative to the embedded flange, and is attached to another member;
Polymer connection for power cables with

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