JP2014050222A - Connection device for feeding coaxial cable - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a connection device for a feeding coaxial cable excellent in safety, and capable of saving space and dramatically improving maintainability and workability.SOLUTION: A connection device for a feeding coaxial cable is an insulation unit having a configuration in which a first embedded electrode, a second embedded electrode and an insulation part formed of hard insulation material are integrally formed and a shield layer is formed on the surface of the insulation part. Further, in a hermetically sealed space inside the insulation unit, an inner conductor of the feeding coaxial cable and a cable conductor of a first single power core cable are electrically connected via the first embedded electrode, and an outer conductor of the feeding coaxial cable and a cable conductor of a second single core power cable are electrically connected via the second embedded electrode.

Description

  The present invention relates to a feeder coaxial cable connecting portion for connecting two single-core power cables to a feeder coaxial cable used as a feeder in a coaxial cable AC feeder system of a train.

  Conventionally, a cable feeding system using a coaxial cable having a double structure of an inner conductor and an outer conductor has been put to practical use as a feeding system for an AC electric railway. An outline of the system for cable feeding is shown in FIG.

As shown in FIG. 1, in the coaxial cable AC feeder system 1, the feeding current output from the railway substation 2 is supplied to the train 5 via the inner conductor 11 and the trolley wire 3 of the feeding coaxial cable 10. The The return current is sucked up from the rail 4 and returned to the railway substation 2 through the outer conductor 13 of the feeding coaxial cable 10.
In the electric railway substation 2, the three-phase alternating current transmitted from the power plant is stepped down to a voltage suitable for the feeding system (for example, 30 kV) and converted into a single-phase alternating current. Supplied. According to the coaxial cable AC feeding system 1, currents in opposite directions flow through the inner conductor 11 and the outer conductor 13 of the feeding coaxial cable 10, and the magnetic forces due to the respective currents cancel each other. Can be suppressed.

  In the coaxial cable AC feeder system 1, single power cables 20, 30 are connected to the inner conductor 11 and the outer conductor 13 of the feeder coaxial cable 10 at the terminal portion of the feeder coaxial cable 10, respectively. A power feeding coaxial cable connecting device C is provided. The feeder coaxial cable 10 is electrically connected via the power cables 20 and 30 when the feeder transformer (not shown) is installed in the railway substation 2.

  As shown in FIG. 2, the conventional feeder coaxial cable connection device C2 is constructed with porcelain soot-type air termination connection portions 41 to 43 at the ends of the respective cables 10 to 30, and the conductor lead portions are aerial. It is configured to be connected by lines 44 and 45 (jumper lines). Specifically, the conductor lead-out portion 411 and the inner conductor 11 of the electric coaxial cable 10 are electrically connected within the soot pipe of the air termination connection portion 41, and the conductor lead-out portion 412 and the outer conductor of the electric coaxial cable 10 are electrically connected. 13 is electrically connected. Further, the conductor lead-out portion 421 and the cable conductor 21 of the first single-core power cable 20 are electrically connected in the soot pipe of the air end connection portion 42, and the conductor lead-out is conducted in the soot pipe of the air end connection portion 43. The part 431 and the cable conductor 31 of the second single-core power cable 30 are electrically connected. Then, by connecting the conductor lead portion 411 and the conductor lead portion 421 with an overhead wire (jumper wire) 44, the inner conductor 11 of the feeding coaxial cable 10 and the cable conductor 21 of the first single-core power cable 20 are connected to each other. Are electrically connected. Also, by connecting the conductor lead portion 412 and the conductor lead portion 431 with an overhead wire (jumper wire) 45, the outer conductor 13 of the feeding coaxial cable 10 and the cable conductor 31 of the second single-core power cable 30 are connected to each other. Are electrically connected.

In addition, there exist some which are disclosed by the following patent documents as a technique regarding the connection of a some power cable, or the technique regarding the termination | terminus connection part of a power cable.
For example, Patent Documents 1 and 2 disclose a connection technique between coaxial cables, and Patent Document 3 discloses a connection technique between single-core power cables. Patent Document 4 discloses a Y-branch type cable connecting portion. Patent Document 5 discloses a terminal connection for a coaxial cable.

JP 2007-325442 A JP 2001-112139 A JP 2009-240020 A JP-A-10-136549 JP 2008-312303 A

However, the conventional feeder coaxial cable connection device C2 uses the porcelain porcelain tube type air termination connection portions 41 to 43, and thus has the following problems.
That is, since the high-voltage part and the charging part are exposed, there is a risk that a human disaster (electric shock) or fire may occur due to contact. Further, since a separation distance is necessary to prevent human injury and fire due to contact, a large installation space must be secured. Further, if the insulator is polluted by salt or dust in the atmosphere, a leakage current tends to flow and there is a risk of causing a ground fault or the like, so periodic cleaning maintenance is required. In addition, since the porcelain porcelain tube, the pedestal, and the like are heavy and the carrying work is complicated, it is necessary to increase the cable processing length to form the air termination connection portion, so that the construction time is lengthened.

  An object of the present invention is to provide a feeder coaxial cable connection device that is excellent in safety, can save space, and can significantly improve maintenance and workability.

A feeder coaxial cable connection device according to the present invention includes a first embedded electrode that connects an inner conductor of a feeder coaxial cable and a cable conductor of a first single-core power cable;
A second embedded electrode connecting the outer conductor of the feeding coaxial cable and the cable conductor of the second single-core power cable;
Surrounding outer peripheral surfaces of the first embedded electrode and the second embedded electrode, and mounting the feeding coaxial cable, the first single-core power cable, and the second single-core power cable And an insulating unit made of a hard insulating material having a cable terminal receiving part, and further comprising an insulating unit in which a shielding layer is formed on the outer surface of the insulating part,
In the insulating unit, an inner conductor of the feeding coaxial cable and a cable conductor of the first single-core power cable are electrically connected via the first embedded electrode, and the feeding The outer conductor of the coaxial cable and the cable conductor of the second single-core power cable are electrically connected via the second embedded electrode.

  ADVANTAGE OF THE INVENTION According to this invention, while being excellent in safety, space saving can be achieved, Furthermore, the feeder coaxial cable connection apparatus which can improve maintenance property and workability | operativity can be implement | achieved.

It is a figure which shows the outline of a coaxial cable alternating current feeding system. It is a figure which shows the conventional coaxial cable connection apparatus for feeding. It is a figure which shows typically the feeder coaxial cable connection apparatus which concerns on embodiment. It is a figure which shows in detail the feeder coaxial cable connection apparatus which concerns on embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 3 is a diagram schematically showing the feeder coaxial cable connection device according to the embodiment. FIG. 4 is a diagram showing in detail the feeder coaxial cable connection device according to the embodiment. The feeder coaxial cable connection device C1 shown in FIGS. 3 and 4 is, for example, in the coaxial cable AC feeder system 1 shown in FIG. 1 where a feeder coaxial cable 10 is connected to the feeder system (reference numeral C1 in FIG. 1). ).

  As shown in FIGS. 3 and 4, in the feeding coaxial cable connection device C <b> 1, the first single-core power cable 20 and the second single-core power cable 30 are connected to the feeding coaxial cable 10. In addition, the insulating unit 50 is used.

Although shown in a simplified manner in FIG. 3, the feeding coaxial cable 10 includes, in order from the center, an inner conductor 11, an inner insulating semiconductive layer (not shown), an inner insulating layer 12, and an inner insulating outer semiconductive. Layer (not shown), external conductor 13, internal semiconductive layer for external insulation (not shown), external insulating layer 14, external semiconductive layer for external insulation (not shown), shielding layer (not shown), holding tape (not shown) Abbreviation), a vinyl sheath (not shown), and the like.
The feeding coaxial cable 10 is a so-called high voltage coaxial cable in which the inner insulating layer 12 and the outer insulating layer 14 are made of crosslinked polyethylene. In the coaxial cable AC feeding system 1, a feeding current by a first voltage (for example, 30 kV to ground) flows through the inner conductor 11 to transmit power, and a second voltage (for example, 6.6 kV) is transmitted to the outer conductor 13. ) Causes a return current to flow and power is transmitted. The first voltage applied to the inner conductor 11 is higher than the second voltage applied to the outer conductor 13. The shielding layer is grounded.

  The first single-core power cable 20 includes, in order from the center, a cable conductor 21, an internal semiconductive layer (not shown), an insulating layer 22, an external semiconductive layer (not shown), a shielding layer (not shown), and a pressing tape (not shown). (Not shown), a sheath (not shown) and the like. The first single-core power cable 20 is a 66 kV CV cable that can handle, for example, 30 kV to the ground, in which the insulating layer 22 is made of crosslinked polyethylene. The 1st single core electric power cable 20 is connected to the 66 kV side of the electric power equipment installed in the railway substation 2, for example.

  The second single-core power cable 30 has the same configuration as the first single-core power cable 20. The second single-core power cable 30 is, for example, a 6.6 kV CV cable in which the insulating layer 32 is made of crosslinked polyethylene. The 2nd single core electric power cable 30 is connected to the 6.6kV side of the electric power equipment installed in the railway substation 2, for example.

  When the feeding coaxial cable 10, the first single-core power cable 20, and the second single-core power cable 30 are attached to the insulation unit 50, each terminal is stepped off at a predetermined length from the tip, Is exposed. Further, the inner conductor 11 of the feeding coaxial cable 10, the cable conductor 21 of the first single-core power cable 20, and the tip of the cable conductor 31 of the second single-core power cable 30 are energized by a metal material. A suitable conductive conductor connection sleeve (not shown) is attached by compression.

The insulating unit 50 includes a first embedded electrode 51, a second embedded electrode 52, an insulating portion 53, a shielding layer 54, and the like.
The mounting portion of the feeding coaxial cable 10 in the insulating unit 50 preferably has a slip-on structure. In the case of the slip-on structure, since the cable processing length is short and the cable can be easily attached and detached, the construction time can be greatly reduced.

  The insulating part 53 is a hollow molded body made of a hard insulator such as an epoxy resin. The insulating part 53 is a first cable terminal receiving part 53a for mounting the terminal of the first single-core power cable 20, and a second cable terminal receiving for mounting the terminal of the second single-core power cable 30. A third cable terminal receiving portion 53c for mounting the terminal 53b and the terminal of the feeding coaxial cable 10; Here, the terminal of the cable includes a connection part. In FIG. 4, the second cable terminal receiving portion 53b is formed at a portion branched from the portion where the third cable terminal receiving portion 53c is formed.

The first embedded electrode 51 is made of a metal material suitable for energization, such as a copper alloy, and is disposed so as to connect the first cable terminal receiving portion 53a and the third cable terminal receiving portion 53c.
The second embedded electrode 52 is made of a metal material suitable for energization, such as a copper alloy, and is disposed so as to connect the second cable end receiving portion 53b and the third cable end receiving portion 53c.
The first embedded electrode 51, the second embedded electrode 52, and the insulating portion 53 are integrally formed by epoxy resin molding.

  The terminal of the first single-core power cable 20 that has been subjected to the stripping process is attached to the first cable terminal receiving portion 53a. Specifically, a connection component 60 including a stress cone 61, a compression device 62 (here, a pressing metal, a spring, a pressing metal flange 621) and the like is attached to the terminal of the first single-core power cable 20. By connecting the terminal of the first single-core power cable 20 to which the connection component 60 is attached to the first cable terminal receiving portion 53a (inserted in FIG. 4), the cable conductor 21 and the first embedded electrode 51 are connected. Are electrically connected. In addition, the shielding layer of the first single-core power cable 20 is connected to the ground potential via the metal fitting flange 621 here. The configuration of the terminal of the first single-core power cable 20 may be a known connection method, and is not limited to this.

  The terminal of the second single-core power cable 30 that has been subjected to the stripping process is attached to the second cable terminal receiving portion 53b. Thereby, the cable conductor 31 and the second embedded electrode 52 are electrically connected. In FIG. 4, a T-shaped (or L-shaped) connector attached to the end of the second single-core power cable 30 is placed on the second cable terminal receiving portion 53b, and a shielding layer (not shown) on the outer periphery of the connector is provided. The shielding layer 54 of the insulating unit 50 is connected. That is, the charging part is not exposed by the shielding layer on the outer periphery of the connector. The shielding layer of the second single-core power cable 30 is grounded. The configuration of the terminal of the second single-core power cable may be a known connection method, and is not limited to the form shown in FIG.

  The terminal of the feeding coaxial cable 10 that has been subjected to the stripping process is attached to the third cable terminal receiving portion 53c in a slip-on manner in the same manner as the first single-core power cable 20. The inner conductor 11 and the first embedded electrode 51 are electrically connected. In addition, the outer conductor 13 and the second embedded electrode 52 are electrically connected. The shielding layer of the feeding coaxial cable 10 is connected to the ground potential via the flange 622.

  That is, in the sealed space in the insulating unit 50, the inner conductor 11 of the feeding coaxial cable 10 and the cable conductor 21 of the first single-core power cable 20 are electrically connected via the first embedded electrode 51. Connected. Further, the outer conductor 13 of the feeding coaxial cable 10 and the cable conductor 31 of the second single-core power cable 30 are electrically connected via the second embedded electrode 52.

  The portion (including the first embedded electrode 51) where the inner conductor 11 of the feeding coaxial cable 10 and the cable conductor 21 of the first single-core power cable 20 are connected becomes the first high-voltage portion, A portion (including the second embedded electrode 52) where the outer conductor 13 of the coaxial cable 10 and the cable conductor 31 of the second single-core power cable 30 are connected becomes a second high-voltage portion. All of the first high-voltage part and the second high-voltage part are covered with the insulating part 53 and insulated from the outside. A first voltage is applied to the first high voltage section, and a second voltage is applied to the second high voltage section. In the embodiment, a voltage of 30 kV to the ground is applied to the first high-voltage part, and a voltage of 6.6 kV is applied to the second high-voltage part.

  In addition, it is necessary between the conductor connection sleeve attached to the inner conductor 11 and the first embedded electrode 51 and between the conductor connection sleeve attached to the cable conductor 21 and the first embedded electrode 51. Accordingly, a conductor contact such as a multi-ram band may be interposed.

The shielding layer 54 of the insulating unit 50 is a conductive layer formed on the outer surface of the insulating portion 53. When the shielding layer 54 is grounded, the outer surface of the insulating unit 50 is held at the ground potential. Thereby, the electric field stress in the insulating part 53 is alleviated and the external leakage of the electric field is prevented.
The shielding layer 54 is formed, for example, by applying a conductive paint to the outer surface of the insulating portion 53. When the shielding layer 54 is formed by applying a conductive paint, the shielding layer 54 can be easily formed, so that the degree of freedom in designing the shape of the insulating portion 53 is increased.

  The shielding layer 54 of the insulating unit 50, the shielding layer of the feeding coaxial cable 10, the shielding layer of the first single-core power cable 20, or the shielding layer of the second single-core power cable 30 are edge cut portions described later. The edge is cut by providing. By providing this edge cutting part, the shielding layer of the cable can be protected from an open / close surge or a lightning surge of the power equipment.

  The edge cut portion may be formed by an insulating tube made of epoxy resin. However, as shown in FIG. 4, one end of the insulating portion 53 is formed by not forming the shielding layer 54 at the end portions 53d and 53e of the insulating portion 53. The portion 53d serves as an edge cutting portion for cutting off the shielding layer (here, the metal fitting flange 621) and the shielding layer 54 of the first single-core power cable 20, and the other end portion 53e of the insulating portion 53 is the feeding coaxial cable 10. The shielding layer (in this case, the flange 622) and the shielding layer 54 become an edge cutting portion. This eliminates the need for an insulating cylinder for edge cutting, reduces the number of parts, and improves workability during assembly, which is more preferable.

As described above, the feeder coaxial cable connection device C1 according to the embodiment is configured to connect the inner conductor 11 of the feeder coaxial cable 10 and the cable conductor 21 of the first single-core power cable 20 to each other. An electrode 51, a second embedded electrode 52 that connects the outer conductor 13 of the feeding coaxial cable 10 and the cable conductor 31 of the second single-core power cable 30, the first embedded electrode 51, and the second embedded electrode 51 Cable terminal receiving portions 53 a to 53 c for surrounding the outer peripheral surface of the embedded electrode 52 and for mounting the feeding coaxial cable 10, the first single-core power cable 20, and the second single-core power cable 30. And the insulating unit 53 made of a hard insulating material such as an epoxy resin, and an insulating unit 50 having a shielding layer 54 formed on the outer surface of the insulating unit 53.
In the sealed space in the insulating unit 50, the inner conductor 11 of the feeding coaxial cable 10 and the cable conductor 21 of the first single-core power cable 20 are electrically connected via the first embedded electrode 51. The Further, the outer conductor 13 of the feeding coaxial cable 10 and the cable conductor 31 of the second single-core power cable 30 are electrically connected through the second embedded electrode 52.

According to the power feeding coaxial cable connection device C1, the high-voltage part and the charging part are covered with the shielding layer 54, and a completely sealed structure that is not exposed is realized, thereby effectively preventing human injury (electric shock) and fire due to contact. Yes, it is excellent in safety.
In addition, it is possible to connect the feeding coaxial cable 10, the first single-core power cable 20, and the second single-core power cable 30 with one insulating unit 50, and in the case of installing a conventional air termination connection portion Since it is not necessary to secure such a separation distance, it is possible to greatly save space as compared with the conventional feeder coaxial cable connection device C2 (see FIG. 2).
Moreover, since the insulating unit 50 which is not a soot tube type is used, insulator contamination does not occur and periodic cleaning maintenance becomes unnecessary. Furthermore, since the insulating unit 50 is lighter than the porcelain porcelain tube, the carrying work is also simplified. That is, maintainability and workability are greatly improved.

  Accordingly, the feeding coaxial cable connecting device C1 is suitable as a cable connecting device provided in the feeding system of the coaxial cable AC feeding system 1.

  As mentioned above, the invention made by the present inventor has been specifically described based on the embodiment. However, the present invention is not limited to the above embodiment, and can be changed without departing from the gist thereof.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

10 coaxial cable for power feeding 11 inner conductor 12 inner insulating layer 13 outer conductor 14 outer insulating layer 20 first single-core power cable 21 cable conductor 22 insulating layer 30 second single-core power cable 31 cable conductor 32 insulating layer 50 insulation Unit 51 First embedded electrode 52 Second embedded electrode 53 Insulating portion 53a, 53b, 53c Cable end receiving portion 54 Shielding layer 60 Connection component 61 Stress cone 62 Compressor 621 Presser flange 622 Flange C, C1 Feeding Coaxial cable connection device

Claims (3)

A first embedded electrode connecting the inner conductor of the feeding coaxial cable and the cable conductor of the first single-core power cable;
A second embedded electrode connecting the outer conductor of the feeding coaxial cable and the cable conductor of the second single-core power cable;
Surrounding outer peripheral surfaces of the first embedded electrode and the second embedded electrode, and mounting the feeding coaxial cable, the first single-core power cable, and the second single-core power cable And an insulating unit made of a hard insulating material having a cable terminal receiving part, and further comprising an insulating unit in which a shielding layer is formed on the outer surface of the insulating part,
In the insulating unit, an inner conductor of the feeding coaxial cable and a cable conductor of the first single-core power cable are electrically connected via the first embedded electrode, and the feeding A feeder coaxial cable connection device, wherein an outer conductor of a coaxial cable and a cable conductor of the second single-core power cable are electrically connected through the second embedded electrode.   2. The feeder coaxial cable connection device according to claim 1, wherein the insulating portion is made of an epoxy resin.   3. The device according to claim 1, further comprising an edge cut portion that cuts off the shielding layer, the shielding layer of the feeding coaxial cable, and / or the shielding layer of the first single-core power cable. Coaxial cable connection device for feeders.

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