JP2019176723A - Dry type outdoor terminal connection part of high voltage cable - Google Patents

Abstract

To provide an outdoor terminal connection part having sufficient insulating strength and free from the risk of oil leakage or environmental pollution.SOLUTION: The present invention relates to the outdoor terminal connection part of a high voltage cable. The outdoor terminal connection part of the high voltage cable includes: an insulation body circumferentially surrounding a high voltage cable; at least one epoxy resin rods fitted into the insulation body; and a stress cone connected to a connection body and a second section and circumferentially surrounding the high voltage cable.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an outdoor terminal connection portion of a high voltage cable.

  In the expansion of a power system, an overhead wire and a high-voltage cable are often connected or a high-voltage switch and a high-voltage cable are connected. The outdoor termination connection must be used as the end of the high voltage cable. Whether it is a synthetic rubber type outdoor terminal connection part or a ceramics type outdoor terminal connection part, it is necessary to fill the space inside the insulating case of the outdoor terminal connection part with insulating oil. The flammability of oil poses concerns and hidden dangers to power plants, other power facilities, and the surrounding environment.

  One exemplary embodiment of the present invention includes an insulating body that circumferentially surrounds a high-voltage cable, at least one epoxy resin rod that is fitted into the insulating body, and a stress cone that circumferentially surrounds the high-voltage cable. Includes outdoor termination connection for high voltage cables. The insulating body includes a first section provided at a first end, a second section provided at a second end, and a connection body connecting the first section and the second section. Among them, each epoxy resin rod is arranged along the axial direction of the insulating body. The stress cone is connected to the connection body and the second section, and includes a cone member and a cylindrical member. Here, the connecting body is in seamless and intimate contact with the high-voltage cable, but the first section and the second section are in contact with the high-voltage cable via a compressible medium, respectively. By providing an extensible space at the end and the second end, it is possible to maintain a sufficiently constant pressure against the high-voltage cable in the entire outdoor termination connecting portion.

  Other exemplary embodiments are also described herein.

FIG. 1 is a structural schematic diagram of an outdoor termination connection of a high voltage cable according to an exemplary embodiment. FIG. 2 is a cross-sectional view of a portion of an insulating body of an outdoor termination connection of a high voltage cable according to an exemplary embodiment. FIG. 3 is a cross-sectional view of a portion of a stress cone of an outdoor termination connection of a high voltage cable according to an exemplary embodiment. FIG. 4 is a cross-sectional view of a portion of a high voltage cable outdoor termination connection according to an exemplary embodiment.

  Of all the high pressure and ultra high pressure outdoor termination connections, those that do not need to be filled with oil are dry outdoor termination connections.

  Conventional dry outdoor termination connections are not the most desirable choice because they are bulky and expensive and the installation process is complex. For example, the dry design used for conventional 170 kV high voltage cables is a technique that uses a dry "gas" termination connection, and includes an epoxy resin sleeve and a layer of silicone rubber skirted shell outside the epoxy resin sleeve. . To meet the requirements of outdoor termination connections, this type of dry “gas” termination connection epoxy sleeve needs to be long, so its weight is high, cost is high and the installation process is complicated . Another conventional dry design uses a dry “flexible” outdoor termination connection made of synthetic rubber, but such an outdoor termination connection is not hard enough to stand upright, so its application There are limitations.

  The high-voltage cable outdoor termination connection according to one exemplary embodiment of the present invention belongs to an oil-free dry outdoor termination connection and does not cause an explosion or fire.

  The outdoor termination connection of a high voltage cable according to one exemplary embodiment of the present invention is a sliding composite in which the hardness is provided by a series of epoxy rods fitted into the termination connection body rather than a single sleeve. It belongs to the rubber type outdoor terminal connection. Therefore, the dry type outdoor termination connection part having such hardness is easier than the conventional synthetic rubber type outdoor termination connection part or ceramic type outdoor termination connection part. Moreover, it is integrally molded with synthetic rubber, and after inserting the cable into the outdoor termination connection part, it is only necessary to add a connector for connecting an aerial cable to the end of the outdoor termination connection part. The process is simplified by the attachment method, and attachment is easy.

  One exemplary embodiment of the present invention includes a dry outdoor termination connection having the “hardness” of a high voltage cable, which eliminates the need for an epoxy sleeve and uses this “hardness” with multiple epoxy rods. The resistance to bending load and pressure resistance of the dry outdoor terminal connection having “ As a result, the dry outdoor termination connecting portion having this hardness is not affected when subjected to wind force, jumper wire swinging, and other third party attacks. A new requirement is to ensure that the dry outdoor termination connection with the “hardness” has sufficient pressure on the inserted cable in the absence of oil and gas.

  An outdoor termination connection of a high voltage cable according to an exemplary embodiment of the present invention includes an epoxy resin rod and an insulating body, and the epoxy resin rod and the insulation body are required to extend the outdoor termination connection during assembly. It has sufficient elasticity to allow The compressive force provided by the epoxy resin rod and the insulation body provides insulation strength over the entire service life of the outdoor termination connection and can eliminate the risk of oil leakage or environmental contamination.

  An outdoor termination connection of a high voltage cable according to an exemplary embodiment of the present invention includes a compressible medium, and an epoxy resin rod includes a first flange provided at a first end of the insulating body, and a first flange of the insulating body. Because it is fixedly connected to the second flange provided at the two ends, the elasticity of the epoxy resin rod, the first flange and the second flange is maintained at the fixed portion, so that the necessary extension of the outdoor termination connection portion during assembly is performed. And the insulating body contacts the high-voltage cable via a compressible medium at the fixed location.

  One exemplary embodiment of the present invention relates to a dry upright outdoor termination connection that is connected to high and ultra high voltage cables in a transmission line. The central portion of such a dry upright outdoor termination connection portion is a solid rubber member provided with one stress cone and a plurality of epoxy resin glass fiber rods inside, and the epoxy resin glass fiber rods. Is a flexible material that provides or enhances rigidity so that the outdoor termination connection can be upright and can be moved further out to allow cable insertion. Also, a skirt portion is provided outside the solid rubber member, and a copper tail pipe and a top connecting rod are attached to the outdoor terminal connecting portion. Such a dry upright outdoor termination connection has almost completed the main installation process by simply inserting the cable inside and attaching the nut to the top, and the rest is the lead sealing and other auxiliary work Only.

  FIG. 1 is an outdoor termination connection 410 of a high voltage cable 420 according to one exemplary embodiment of the present invention. The outdoor terminal connection portion 410 of the high-voltage cable includes an insulating body 430 that surrounds the high-voltage cable 420 in the circumferential direction, at least one epoxy resin rod 440 fitted in the insulating body 430, and stress that surrounds the high-voltage cable 420 in the circumferential direction. A cone 450. The insulating body 430 includes a first section 431 provided at the first end 432, a second section 433 provided at the second end 434, and a connection body 435 connecting the first section 431 and the second section 433. Have. Each epoxy resin rod 440 is disposed along the axial direction of the insulating body 430. The stress cone 450 is connected to the connection body 435 and the second section 433, and includes a cone member 452 and a cylindrical member 454. Here, the connection body 435 is in contact with the high-voltage cable 420 seamlessly and tightly, but the first section 431 and the second section 433 are in contact with the high-voltage cable 420 via a compressible medium 460, respectively. By providing an expansion / contraction space for the first end 432 and the second end 434, a sufficient constant pressure can be maintained for the high-voltage cable 420 in the entire outdoor termination connection portion 410.

For example, the insulating body 430 is a silicon rubber insulator.

  For example, when the connection body 435 has a shape corresponding to the cone member 452 of the stress cone 450, the cone member 452 of the stress cone 450 can be completely fitted into the insulating body 430, and the stress At least a part of the cylindrical member 454 of the cone 450 is in contact with the second section 433.

  The outdoor termination connection 410 of the high-voltage cable 420 according to an exemplary embodiment of the present invention includes a first flange 510 provided at the first end 432 of the insulation body 430 and a second end 434 of the insulation body 430. And a second flange 520 provided at the top. Here, the epoxy resin rod 440 is fixedly connected to the first flange 510 and the second flange 520.

  For example, each of the epoxy resin rods 440 may be provided in the insulating body 430 and have a predetermined distance from the first flange and the second flange, so that the high-voltage cable 420 is connected to the outdoor terminal connection 410. Maintain a constant pressure sufficient for

  For example, the epoxy resin rod 440 is fixedly connected to the first flange 510 and the second flange 520 via a first metal fitting 540 and a second metal fitting 550, respectively.

  As an example, the material of the first metal fitting 540 and the second metal fitting 550 is aluminum.

  As an example, the first metal fitting 540 is fixedly connected to a connector 490 that connects the high-voltage cable 420 and an overhead wire.

As an example, the height of the space filled with the compressible medium 460 at the second end 434 is 80 to 250 cm.

  As an example, the compressible medium 460 is air.

  As an example, the outdoor termination connection portion 410 has a cylindrical shape.

  As an example, the outdoor termination connection portion 410 has a cylindrical shape with a gradually decreasing circumference, and can be used for an application to increase the size or voltage level of a conductor.

  FIG. 2 is a cross-sectional view illustrating a portion of an insulation body 430 of an outdoor termination connection portion of a high voltage cable according to one exemplary embodiment of the present invention, and the insulation body 430 includes at least one skirt portion on an outer peripheral surface. 530 is extended and formed. The insulating body 430 includes a first section 431, a second section 433, and a connection body 435 that connects the first section 431 and the second section 433.

  As an example, the skirt portion includes a long skirt portion 560 and a short skirt portion 580 that are alternately arranged in the axial direction in the insulating body 430 so as to increase a creepage distance.

  For example, the insulating body 430 is a silicon rubber insulator.

  By way of example, the longitudinal distance of the first section 431 of the outdoor termination connection of the high voltage cable according to one exemplary embodiment of the present invention is 80-250 cm.

  FIG. 3 is a cross-sectional view illustrating a portion of a stress cone 450 of an outdoor termination connection of a high voltage cable according to one exemplary embodiment of the present invention. The stress cone 450 includes a cone member 452 and a cylindrical member 454. The cylindrical member 454 has a fitting portion 610 and an exposed portion 620. As shown in FIG. 4, the mating portion 610 is fully mated within the second section 433 of the outdoor termination connection of one exemplary embodiment of the present invention, while the exposed portion 620 is the second section. Do not touch.

  As an example, the cylindrical member 454 of the stress cone 450 makes a seamless and intimate contact with the high voltage cable.

  It should be noted that the technical features and technical solutions described in this specification can be combined in any suitable manner in one or more embodiments. The numbers such as “first” and “second” attached to the members in this specification are merely for distinguishing the objects of explanation, and do not have any order or technical meaning. The present application is not limited to the embodiment described in the present embodiment, and can be realized in various different forms. The above description is to describe the present invention in more detail with reference to specific embodiments, but it cannot be recognized that the specific implementation of the present invention is limited only to these descriptions. .

  For example, “epoxy resin rod” as used herein includes, but is not limited to, epoxy resin glass fiber rods, and non-metal rods may be used instead, and rods or other Columnar objects can be used.

  For example, a “high voltage cable” used in this specification refers to a cable that transmits electric power of 36 kV or more.

  For example, as used herein, “ultra-high voltage cable” refers to a cable that transmits power of 220 kV or higher.

  For example, as used herein, “medium voltage cable” refers to a cable that transmits power of 3 kV to 36 kV or more.

  For example, as used herein, “sufficiently constant pressure” refers to a compressive force provided by an insulating body and an epoxy resin rod, and a constant compressive force sufficient to maintain the interface insulation strength. . For example, the outdoor termination connection of a high voltage cable according to one exemplary embodiment of the present invention has a smaller inner diameter than the cable to which it is attached, so that the contact between the outdoor termination connection and the high voltage cable is seamless and tight. The insulation strength can be achieved without the need for an insulating liquid or the assistance of mechanical equipment. For outdoor termination connections for high-voltage and ultra-high-voltage cables, there is a requirement for the pressure retained between the outdoor termination connection and the cable, but for medium-pressure cables, there is no strict requirement for the pressure, and the outdoor termination connection It only has to be in contact with the cable.

  For example, as used herein, “fully fitted” refers to seamless and intimate contact.

410 Outdoor Termination Connection 420 High Voltage Cable 430 Insulation Body 431 First Section 432 First End 433 Second Section 434 Second End 435 Connector 440 Epoxy Resin Bar 450 Stress Cone 452 Cone Member 454 Cylinder Member 460 Compressible Medium 490 Connector 510 first flange 520 second flange 530 skirt portion 540 first metal fitting 550 second metal fitting 560 long skirt portion 580 short skirt portion 610 fitting portion 620 exposed portion

Claims (11)

A first section provided at the first end;
A second section provided at the second end;
An insulating body including a connection body connecting the first section and the second section, and surrounding the high-voltage cable in a circumferential direction;
Each disposed along the axial direction of the insulating body, and at least one epoxy resin rod fitted into the insulating body;
An outdoor terminal connection portion of a high-voltage cable, comprising: a stress cone that is connected to the connection body and the second section, surrounds the high-voltage cable in a circumferential direction, and includes a cone member and a cylindrical member;
The connecting body makes a seamless and intimate contact with the high voltage cable, but the first section and the second section respectively contact the high voltage cable via a compressible medium, thereby the first end and the The outdoor termination connection part of the high voltage | pressure cable which can hold | maintain sufficient constant pressure with respect to the said high voltage | pressure cable in the said whole outdoor termination connection part by providing expansion / contraction space in a 2nd end.   The outdoor termination connection part according to claim 1, wherein the insulating body is a silicon rubber insulator.   Since the connection body has a shape corresponding to the cone member of the stress cone, the cone member of the stress cone can be completely fitted into the insulating body, and the cylindrical member of the stress cone is at least one. The outdoor termination connection part of Claim 1 or 2 in which a part contacts the said 2nd section.   The outdoor termination connection part according to claim 1 or 2, wherein the cylindrical member of the stress cone includes a fitting part that is completely fitted into the second section, and an exposed part that does not contact the second section.   The outdoor termination connection part according to claim 1 or 2, wherein the cylindrical member of the stress cone is in seamless and intimate contact with the high-voltage cable.   The outdoor termination connection according to claim 1 or 2, wherein the compressible medium is air.   The outdoor termination connection part according to claim 1 or 2, wherein a longitudinal distance of the first section is 80 to 250 cm. A first flange provided at a first end of the insulating body;
A second flange provided at a second end of the insulating body;
The outdoor terminal connection part according to claim 1 or 2, wherein the epoxy resin rod is fixedly connected to the first flange and the second flange.   The outdoor termination connection part according to claim 1 or 2, wherein a height of the compressible medium is 80 to 250 cm.   The outdoor terminal connection part according to claim 1, further comprising at least one skirt part formed extending from an outer peripheral surface of the insulating body.   The outdoor termination | terminus connection part of Claim 10 in which the said skirt part contains the long skirt part and short skirt part which are alternately arrange | positioned by the axial direction in the said silicone rubber insulator.

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