JP3105112B2 - Conductor connection - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a conductor connecting portion for connecting a box such as a gas insulated switchgear with a cable.

[0002]

2. Description of the Related Art FIG. 7 is a right side view showing a conventional gas insulated switchgear to which a conductor connection portion is attached. FIG.
In the center of the box 1 whose outer periphery is surrounded by a mild steel plate, a partition 1a for vertically partitioning the box 1 is provided vertically in the center of the box 1. An inverted U-shaped partition 1b is attached to the front side of the partition 1a, and an inverted L-shaped partition 1c is formed at the upper rear of the partition 1a. Furthermore, box 1
A partition 1d is provided below the rear end.

As a result, an operation mechanism chamber 1A is formed on the front side of the partition 1b, and a circuit breaker chamber 40 is provided at the rear of the partition 1b.
Are formed. A busbar chamber 1B is formed between the partition 1a and the partition 1c, and the partition 1c and the partition 1d are formed.
A power receiving room 1C is formed between the two, and a cable room 1D is formed behind the partition 1d.

[0004] Among them, the operating mechanism room 1A houses the operating mechanism 41a of the vacuum circuit breaker at the lower end, and the breaker room 40 has:
The vacuum circuit breaker 41 is housed. An upper electrode protruding rearward from the upper part of the vacuum circuit breaker 41 is connected to a front end of an insulating spacer 46A penetrating forward and backward at the upper part of the partition wall 1a, and a lower electrode protruding rearward from the lower part of the vacuum circuit breaker 41 also. Is the partition 1
It is connected to the front end of an insulating spacer 46B penetrating back and forth at the center of the portion a.

[0005] The ceiling of the busbar room 1B is provided in Japanese Patent Laid-Open No. 60-1603.
A T-shaped bushing 43 shown in Japanese Patent Publication No. 09 is penetrated. A disconnector 45 with a grounding device is fixed to the lower part of the bus bar 1B, and a current transformer 44 is fixed to the lower surface of the ceiling plate in front of the T-shaped bushing 43. The terminal on the front side of the current transformer 44 is connected to the rear end of the insulating spacer 46A by a conductor.
A rear terminal of the current transformer 44 is connected to a front end of a disconnector 45A attached to a partition 1c at a rear lower portion of the current transformer 44. The rear terminal of the disconnector 45 is a T-shaped bushing 43
Is connected to the lower end.

[0006] In the power receiving room 1C, a disconnector 45B with a grounding device is vertically fixed to the lower rear surface of the partition wall 1a.
Is connected to the rear end of the insulating spacer 46B by a conductor. At the back of the power receiving room 1C, the lightning arrestor
A disconnecting rod 48a protruding downward from the lower end of the lightning arrester 48 is connected to the upper end of a bushing 49 erected at the center of the partition 1d.

The upper terminal of the bushing 49 is formed by an insulator 49B attached to the rear of the partition 1c and a conductor 47 supported up and down by an insulator 48 attached to the bottom of the box 1.
It is connected to the lower terminal of disconnector 45B.

A bushing 49 is connected to an upper end of a cable head 50 vertically provided at an intermediate portion of the partition 1d. The cable head 50 is set up from a pit formed on a floor on which the box 1 is installed. The high-pressure cross-linked polyethylene cable 51 is connected to the upper end.

The circuit breaker room 40, the busbar room 1B, and the power receiving room 1C are filled with sulfur hexafluoride gas as an insulating gas, and a box (not shown) is connected to a side surface of the box 1, which is not shown. The T-shaped bushing 43 shown in FIG.
The T-shaped bushing 43 and the T-shaped bushing 43 shown in FIG. 7 are connected by a high-pressure cross-linked polyethylene cable (not shown).

By the way, in the gas insulated switchgear configured as described above, when it is shipped from a manufacturing plant, a withstand voltage test is performed in accordance with the Japan Electrical Manufacturers' Association standard (JEM1425). Before starting, a predetermined withstand voltage test is performed in accordance with the electrical equipment technical standards.

FIG. 8 is a diagram showing a method of connecting a not-shown test transformer and a T-shaped bushing 43 on the ceiling of the box 1 when performing the withstand voltage test. In FIG. 8, the left end of the cable 50 in which the compression terminal 54a is attached to the terminal processing unit 54 at the right end penetrates the protective tube 53, and a left side of the flange 53a at the left end of the protective tube 53 has a truncated cone shape. Rubber insulation layer
52 is inserted. An annular contact ring 6 is inserted into the core exposed at the left end of the cable 50.

When conducting a withstand voltage test of the electric equipment in the box shown in FIG. 7, a cable (not shown) inserted into an opening 43a formed on the left side of the T-shaped bushing 43 shown in FIG. The electric device housed in the adjacent box is cut off, a blind plug (not shown) inserted into the right opening 43a is removed, and the blind plug is inserted into the left opening 43a. 6 is inserted into the axis of the T-shaped bushing 43, and the flange 53a is tightened and connected to the right side surface of the T-shaped bushing.

When the withstand voltage test is completed, the blind plug is removed and assembled on the right side. When all of the withstand voltage tests on the adjacent board are completed, a cable for connecting the adjacent board to the T-shaped bushing of the box 1 is assembled.

[0014]

However, in the T-shaped bushing 43 constructed as described above, it takes time to disconnect the cable connected to the blind plug and the adjacent panel, and to connect the cable 50 and restore it after the test is completed. It takes.

That is, when the right blind plug is incorporated into the left opening 43a and when the insulating layer 52 at the left end of the cable 50 is incorporated into the right opening 43a, the reliability of the withstand voltage test due to the adhesion of dust and dirt is reduced. In order to prevent the lowering, the left and right openings, the insertion portion of the blind plug, and the surface of the rubber insulating layer 52 must be wiped with alcohol. In addition, silicone grease must be applied to this surface. Further, a pressing tool (not shown) incorporated inside the protective tube 53 is adjusted so that the blind plug and the silicone rubber-coated surface of the rubber insulating layer 52 are uniformly pressed with a predetermined pressure against the inner periphery of the opening 43a. There must be.

Moreover, since the cable 50 is long and heavy, the connection work between the upper part of the box 1 and the terminals of the test transformer involves not only labor but also work on the upper surface of the box 1 is performed at a high place. Becomes Therefore, an object of the present invention is to obtain a conductor connection portion that can easily perform a withstand voltage test.

[0017]

According to a first aspect of the present invention, a trough-shaped groove is formed in a head portion of a T-shaped insulating layer in which a center conductor is buried in an axial center in a direction orthogonal to the center conductor. A lower bushing, a holding electrode provided to face the head of the center conductor and an end of the connection conductor inserted between the head of the center conductor, and a pressing electrode provided opposite to the head of the lower bushing, The conductor connecting portion includes an upper bushing whose opposing surface is pressed against the opposing surface of the lower bushing by fastening with a fastener.

According to a second aspect of the present invention, a gutter-shaped groove is formed in a head portion of a T-shaped first insulating layer in which a first center conductor is buried in an axial center in a direction orthogonal to the center conductor. A presser electrode provided opposite to the head of the first central conductor and having an end of the connection conductor inserted between the lower bushing and the head of the first central conductor; and a head of the lower bushing The second center conductor is embedded in the axis of the second insulating layer on the same axis as the first center conductor, and the facing surface of the lower bushing is tightened by a fastener. A conductor connection portion formed by an upper bushing pressed against the opposing surface and having the head of the second central conductor in contact with the holding electrode.

According to a third aspect of the present invention, a gutter-like groove is formed in the head of the first insulating layer in which the plurality of first center conductors are buried in a direction orthogonal to each center conductor. A lower bushing, a presser electrode provided opposite to the head of the first central conductor and having an end of the connection conductor inserted between the lower bushing and the head of the first central conductor, and a head of the lower bushing The second center conductor is buried in the axis of the second insulating layer on the same axis as the first center conductor, and the opposing surface is opposed to the lower bushing by fastening with a fastener. This is a conductor connecting portion composed of an upper bushing that is pressed against the surface and the head of the second central conductor contacts the pressing electrode.

According to a fourth aspect of the present invention, a gutter-like groove is formed in a head portion of the first insulating layer in which the plurality of first center conductors are buried in a direction orthogonal to each center conductor. A lower bushing, a presser electrode provided opposite to the head of the first central conductor and having an end of the connection conductor inserted between the lower bushing and the head of the first central conductor, and a head of the lower bushing The second center conductor is embedded in the axial center of the second insulating layer formed radially with respect to the head, and the opposing surface is opposed to the lower bushing by fastening with a fastener. This is a conductor connecting portion composed of an upper bushing that is pressed against the surface and the head of the second central conductor contacts the pressing electrode.

According to a fifth aspect of the present invention, there is provided a lower portion in which a gutter-shaped groove is formed in a head portion of an insulating layer in which a plurality of first center conductors are buried, in a direction orthogonal to each center conductor. A bushing, a presser electrode provided opposite to the head of the first center conductor and having an end of the connection conductor inserted between the head of the first center conductor, and a head opposing the head of the lower bushing. The second center conductor is housed in the axis of an insulating cylinder radially formed with respect to the head, and the head of the second center conductor comes into contact with the holding electrode by being tightened by a fastener. A conductor connecting portion including an upper bushing.

Further, according to a sixth aspect of the present invention, the first central conductor is buried in parallel with the top of the first insulating layer so as to be located at each vertex of the triangle. The end of the connection conductor is inserted between the lower bushing having a gutter-like groove formed in parallel with the head of the first center conductor and the head of the first center conductor. The holding electrode is provided to face the head of the lower bushing, and a second center conductor is buried on the axis of the second insulating layer on the same axis as the first center conductor. The conductor connection portion is formed by the upper bushing in which the opposing surface is pressed against the opposing surface of the lower bushing by tightening, and the head of the second central conductor contacts the pressing electrode.

[0023]

According to the first aspect of the present invention, the end of the connection conductor is connected to the center conductor by a pressing electrode pressed through the upper bushing when the upper bushing is tightened by the fastener.

In the invention according to claim 2,
The end of the connection conductor and the second center conductor of the upper bushing are
When the upper bushing is tightened by the fastener, the upper bushing is connected to the center conductor by a pressing electrode pressed through the upper bushing.

Further, in the third, fourth, fifth and sixth aspects of the present invention, the end of each connection conductor and the second center conductor of each upper bushing are tightened by a fastener. Are connected to the respective center conductors by pressing electrodes pressed through the upper bushing.

[0026]

FIG. 1 is a partial longitudinal sectional view showing an embodiment of a conductor connecting portion according to the first aspect of the present invention, and shows a state where a switchgear is in operation.

In FIG. 1, the outer periphery of a substantially T-shaped central conductor 3 is insulated and covered with an insulating layer 4A of epoxy resin to form a lower bushing 2A. Of these, the center conductor 3
As shown in FIG. 1 and FIG. 6A showing a partial cross-sectional view of FIG. 1, a boss 3b is formed at the upper end of the boss 3b. As shown in FIGS. 6 (a) and 6 (b) which show partial right side views of FIG. 6, a gutter-shaped electrode 3a is formed symmetrically to the left and right.

The insulating layer 4A has a half-moon shape as shown by a dashed line in FIG. 6B in a vertical cross section (not shown) of FIG. 4B so as to form a perfect circle.
It is formed to have the same shape as the T-shaped bushing disclosed in Japanese Patent Application Laid-Open No. 60-160309. In the center of the boss 3b, FIG.
The female screw hole 3c is formed as shown in FIG. Insulating layer 4
The insulating layer 4B mounted on the upper surface of A is formed symmetrically with the upper portion of the insulating layer 4A, and a ground layer (not shown) is formed on the outer periphery of the insulating layer 4B. A bushing 2B is formed.

At the left and right ends of the upper end of the insulating layer 4A, the ends of the pair of high-pressure crosslinked polyethylene cables (hereinafter, referred to as cables) 8 from which the jackets have been peeled are placed. An annular insulating rubber 10 is previously inserted into the outer periphery of the distal end of the inner jacket 8b of the cable 8, and an annular semiconductive rubber 11 is also inserted in advance outside the insulating rubber 10.

A substantially annular contact ring 6 is inserted into the core wire 8a exposed at the end of the cable 8 in advance.
A wedge (not shown) is driven into the end face of the rim. A contact 7 made of a conductive spring material is annularly inserted around the outer periphery of the contact ring 6. As shown in FIG.
A pressing electrode 5 shown in FIG. 6C showing a partial plan view of FIG. 1 is mounted.

The holding electrode 5 has a gutter-shaped electrode 5 on the left and right.
a is formed symmetrically with the electrode 3a. A boss 5b protruding downward is formed symmetrically with the boss 3b at the center of the pressing electrode 5, and the boss 3b has a recess 5 on its upper surface.
c is formed, and a through hole 5d penetrating vertically is formed at the center of the concave portion 5c.

A bolt 12C is inserted into the through hole 5d from above, and a screw portion of the bolt 12C is screwed into the screw hole 3d because it is provided at the upper end of the center conductor 3.
Are fastened to the center conductor 3 by bolts 12C. As a result, the core wire 8a is fastened together with the contact ring 6 and the contact 7 by the upper holding electrode 5 and the lower electrode 3a.

As shown by an alternate long and short dash line, a substantially Ω-shaped holding member 13 is attached to the insulating layer 4B from the top in a side view (not shown).
Is fixed to the ceiling plate 1a. In this ceiling board 1a,
An O-ring 1c is mounted on the outer peripheral upper surface of the through hole 1b, and a lower portion of the insulating layer 4A is provided through the through hole 1b.

A cylindrical fixing member 9 is loosely fitted to the cable 8 in advance, and the fixing member 9 is fixed to the side surfaces of the upper and lower insulating layers 4A and 4B with bolts 12A. A seal 14 is provided on the outer surface of the fixing bracket 9 and the peeled portion of the jacket of the cable 8.
Is given. A ground layer (not shown) is provided in advance on the outer periphery of the portion of the insulating layer 4A protruding above the ceiling plate 1a.

In the conductor connecting portion thus constructed, a T-shaped bushing (not shown) penetrated by the left and right cables 8 on the ceiling of the switchgear box (not shown) adjacent to the left and right sides of the box 1. Connected to. Further, the lower end of the center conductor 3 is connected to a vacuum circuit breaker and the like inside the box 1 via a disconnector (not shown) housed inside the box 1.

Next, FIG. 2 is a partial longitudinal sectional view showing an embodiment of the conductor connecting portion according to the second aspect of the present invention, and a T-shaped bushing constructed as shown in FIG. 1 shows a T-shaped bushing for conducting a withstand voltage test between an electric device or a conductor inside a box 1 and a box, and removes an upper insulating bushing 2B shown in FIG. 1 to form an inverted T-shaped upper insulating bushing 2C.
Shows a state in which is incorporated.

In FIG. 2, the upper insulating bushing 2C
In the lower part, an insulating layer 4C of epoxy resin is formed in a substantially truncated cone shape at the upper center of the upper insulating bushing 2B shown in FIG. 1, and a plurality of pleats 4b are formed on the outer periphery of the insulating layer 4C. . A central conductor 4a having a small diameter is buried in the axis of the insulating layer 4C, and an arc-shaped contact portion 4c is formed at a lower end of the central conductor 4a in a side view (not shown). It is in contact with the upper surface of the holding electrode 5.

In this case, the upper insulating bushing 2C is attached from above with a holding member having a substantially Ω shape in a side view (not shown) and having a through hole formed at the center of the upper end, as in FIG. By fixing the lower end of the metal fitting to the ceiling plate 1a, the upper insulating bushing 2C becomes the lower insulating bushing 2C.
A is pressed. By this pressing, the contact portion 4c at the lower end of the center conductor 4a is pressed against the upper surface of the pressing electrode 5.

When measuring the withstand voltage between the electric device or the conductor inside the box 1 and the box and the box, the end of the cable connected to the test transformer is connected to the upper end of the center conductor 4a. In the conductor connecting portion configured as described above, when packing for shipment, the package is shipped in a state of FIG. 1 and rearranged as shown in FIG. 2 after installation at the installation site.
At this time, the upper insulation bushing 2C can be incorporated without removing the cable 8 simply by removing the bolts 12A that fasten the fixing brackets 9 on the left and right sides of the upper insulation bushing 2B. Can be.

In the above embodiment, the switchgear has a low rated voltage and a low rated short-time withstand current value.
When the width of the cable 8 is short and the length of the cable 8 is short, a plurality of recesses are formed on the outer periphery of the insulating layers 4A, 4B, and 4C, regardless of the bolts 12A. The fixing side of the fixing fitting 9 may be engaged with this concave portion.

Next, FIG. 3 is a partial longitudinal sectional view showing an embodiment of the conductor connecting portion according to the third aspect of the present invention, in which the T-shaped bushing shown in FIG. 2 is used for three phases. . In this case, the upper insulating bushing 2E is fixed to the ceiling plate 1a together with the lower insulating bushing 2D with a mountain-shaped fixing tool indicated by a chain line.

FIG. 4 is a partial longitudinal sectional view showing an embodiment of the conductor connecting portion according to the fourth aspect of the present invention. The rated voltage of the switchgear incorporating the conductor connecting portion shown in FIG. The case where the height is high is shown, and the case where the insulating layer of the upper insulating bushing 2G and the center conductors 4a1, 4a2 and 4a3 are radial is shown.

FIG. 5 is a partial longitudinal sectional view showing an embodiment of the conductor connecting portion according to the fifth aspect of the present invention, and shows a case of a gas-insulated conductor connecting portion. In this case, an upper insulating bushing 2H having a cavity formed in the radiation is provided above the lower insulating bushing 2F shown in FIG. 4, and the upper insulating bushing 2H is an O-ring 1k inserted at the lower end. And is air-tightly fixed to the ceiling plate 1e through the inner wall.

Center conductors 4c1, 4c2, and 4c3 are inserted into the upper insulating bushing 2H, and the center conductors 4c1, 4c2, and 4c3 have spacers 16 having an annular middle portion.
The lower end face is subjected to spherical processing, and is coated with nickel plating to prevent an increase in contact resistance due to oxidation. In FIG. 5, a pneumatic valve is provided on the lower right side.
15 are penetrated.

In this case, sulfur hexafluoride gas is sealed in the upper insulating bushing 2H from the pneumatic valve 15.
As a result, it is possible to use a higher voltage than the conductor connecting portions shown in FIGS. 3 and 4, and to reduce the weight.

In the conductor connection portions shown in FIGS. 3, 4 and 5, three center conductors 3 are arranged at respective vertices of an equilateral triangle in a plan view (not shown), and The distance may be further narrowed, and the invention according to claim 6 may be adopted.

In FIG. 5, the center conductors 4c1, 4c
Although the lower ends of c2 and 4c3 are spherically processed to be in contact with the upper surface of the center conductor 3, the center conductors 4c1, 4c2 and 4c2 have been described.
The lower part of 4c3 is cut, a strip-shaped contact plate made of a conductive spring material is connected, and the lower end of this contact plate is brought into sliding contact with the upper surface of the center conductor 3 (that is, wiped). The force applied to the tip of the radial cavity may be reduced. Furthermore, in the above-described embodiment, each conductor connection portion has been described as penetrating the ceiling plate of the box 1 of the switchgear, but may be a side surface of the box 1.

[0048]

As described above, according to the first aspect of the present invention,
A gutter-shaped groove is formed in the head of the T-shaped insulating layer in which the center conductor is buried in the axis, and a gutter-like groove is formed in a direction orthogonal to the center conductor. A presser electrode into which the end of the connection conductor is inserted between the head and the head of the lower bushing is provided so as to face the opposing surface of the lower bushing when pressed by a fastener. By forming the conductor connection portion with the upper bushing, the end of the connection conductor was connected to the center conductor by the pressing electrode pressed through this upper bushing by tightening the upper bushing with the fastener, so that the withstand voltage test was performed. A conductor connection portion that can be easily performed can be obtained.

According to the second aspect of the present invention, a gutter-like shape is provided on the head of the T-shaped first insulating layer in which the first center conductor is buried at the axis thereof in the direction perpendicular to the center conductor. A lower bushing in which a groove is formed, a pressing electrode provided to face the head of the first central conductor, and an end of the connection conductor inserted between the lower bushing and the head of the first central conductor; The second center conductor is embedded in the axis of the second insulating layer on the same axis as the first center conductor, and the opposing surface is lowered by fastening with a fastener. By forming the conductor connection portion by the upper bushing pressed against the opposing surface of the bushing and the head of the second center conductor being in contact with the holding electrode, the end of the connection conductor and the second center conductor of the upper bushing are tightened. Electrode pressed through the upper bushing by tightening the upper bushing with the tool Since the connection to the more central conductor, it is possible to obtain a conductor connecting portion which can be performed easily withstand voltage test.

According to the third aspect of the present invention, a gutter-like groove is parallel to the head of the first insulating layer in which the plurality of first center conductors are embedded in a direction orthogonal to each center conductor. A lower bushing formed in the lower bushing, a pressing electrode provided opposite to the head of the first central conductor, and having an end of the connection conductor inserted between the lower bushing and the head of the first central conductor; A second center conductor is embedded in the axis of the second insulating layer on the same axis as the first center conductor, and the opposing surface is a lower bushing by fastening with a fastener. The conductor connecting portion is formed by the upper bushing pressed against the opposing surface of the second central conductor and the head of the second central conductor comes into contact with the holding electrode, thereby tightening the end of each connection conductor and the second central conductor of each upper bushing. Pressing force that is pressed through this upper bushing when tightening each upper bushing with the attachment Having connected to the center conductor, it is possible to obtain a conductor connecting portion which can be performed easily withstand voltage test.

According to the fourth aspect of the present invention, a gutter-like groove is formed in the head of the first insulating layer in which the plurality of first center conductors are buried in a direction perpendicular to each center conductor. A lower bushing, a presser electrode provided opposite to the head of the first central conductor and having an end of the connection conductor inserted between the lower bushing and the head of the first central conductor, and a head of the lower bushing The second center conductor is embedded in the axial center of the second insulating layer formed radially with respect to the head, and the opposing surface is opposed to the lower bushing by fastening with a fastener. A conductor connecting portion is formed by an upper bushing pressed against the surface and the head of the second center conductor comes into contact with the holding electrode, so that the end of each connection conductor and the second center conductor of each upper bushing are tightened. Pressing electrode pressed through this upper bushing by tightening each upper bushing by Since the connection more respective central conductors, can be obtained conductor connecting portion which can be performed easily withstand voltage test.

According to the fifth aspect of the present invention, a gutter-like groove is formed in the head of the insulating layer in which the plurality of first center conductors are buried in a direction perpendicular to each center conductor. A lower bushing, a pressing electrode provided to face the head of the first central conductor, and an end of the connection conductor inserted between the lower bushing and the head of the first central conductor; The second center conductor is housed in the axial center of the insulating cylinder radially formed with respect to the head, and the head of the second center conductor is held down by the clamp with the pressing electrode. The upper end of each connection conductor and the second center conductor of each upper bushing are pressed through the upper bushing by the tightening of each upper bushing by forming the conductor connecting portion with the upper bushing that comes into contact with the upper bushing. Connected to each center conductor with a holding electrode. Conductor connecting portion that can be made can be obtained.

Further, according to the invention described in claim 6,
A lower bushing in which a gutter-shaped groove is formed in parallel with each center conductor in a direction orthogonal to each center conductor, at a head of the first insulating layer buried in parallel so that the first center conductor is located at each vertex of the triangle; ,
A presser electrode provided to face the head of the first center conductor and having the end of the connection conductor inserted between the head of the first center conductor and the head of the lower bushing; The second
A second center conductor is embedded on the axis of the insulating layer on the same axis as the first center conductor, and the opposing surface is pressed against the opposing surface of the lower bushing by tightening with a fastener. By forming the conductor connection portion with the upper bushing whose head contacts the pressing electrode, the end of each connection conductor and the second center conductor of each upper bushing are tightened by the upper bushing with a fastener. Since each of the center conductors is connected by the pressing electrode pressed through the conductor, it is possible to obtain a conductor connecting portion that can easily perform a withstand voltage test.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional view showing one embodiment of a conductor connecting portion according to the first embodiment of the present invention.

FIG. 2 is a partial longitudinal sectional view showing one embodiment of the conductor connecting portion of the invention according to claim 2;

FIG. 3 is a partial longitudinal sectional view showing one embodiment of the conductor connecting portion of the invention according to claim 3;

FIG. 4 is a partial longitudinal sectional view showing one embodiment of the conductor connecting portion of the invention according to claim 4;

FIG. 5 is a partial vertical sectional view showing one embodiment of the conductor connecting portion of the invention according to claim 5;

6A is a partial plan view of FIG. 1, and FIG.
FIG. 2A is a right side view, and FIG. 2C is a partial plan view different from FIG.

FIG. 7 is a right side view showing an example of a conventional switchgear to which a conductor connection portion is attached.

FIG. 8 is a view showing the operation of a conventional conductor connecting portion.

[Explanation of symbols]

1 ... box body, 2A, 2D, 2F ... lower bushing, 2B,
2C, 2E, 2G, 2H ... upper bushing, 3, 4a,
4a1, 4a2, 4a3, 4c1, 4c2, 4c3: central conductor, 5: holding electrode, 6: contact ring, 7: contact, 8 ...
High-pressure cross-linked polyethylene cable, 9: fixing bracket, 10: insulating rubber, 11: semiconductive rubber, 12A, 12B, 12C: bolt, 13: holding bracket, 14: seal.

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Naoya Hasegawa 2-1-1 Oda Sakae, Kawasaki-ku, Kawasaki City, Kanagawa Prefecture Inside Showa Electric Wire & Cable Co., Ltd. (72) Tetsuo Yoshida 1 Toshiba-cho, Fuchu-shi, Tokyo Stock (72) Inventor Tadashi Nonoshita, 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Toshiba Fuchu Plant (72) Inventor Nobuo Masaki 1, Toshiba-cho, Fuchu-shi, Tokyo Toshiba, Fuchu Plant (72) Inventor Masaru Miyakawa 1 Toshiba-cho, Fuchu-shi, Tokyo, Japan Inside the Toshiba Fuchu Plant, Inc. (72) Inventor Kenichi Sato 1-toshiba-cho, Fuchu-shi, Tokyo, Japan Inside the Fuchu Plant, Toshiba Corporation (72) Inventor Kinoshita Jin 1 Toshiba-cho, Fuchu-shi, Tokyo Inside the Fuchu Plant, Toshiba Corporation (72) Inventor Hiroshi Sonobe 2121 Naoyo, Asahi-cho, Mie-gun, Mie 2121 Co., Ltd. Toshiba Mie Factory (56) References JP-A-60-160309 (JP, A) JP-A-5-199641 (JP, A) JP-A-6-269115 (JP, A) JP-A-6-269117 (JP) , A) JP-A-2-26113 (JP, A) JP-A-6-269116 (JP, A) JP-A 62-54524 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB Name) H02B 13/02-13/075 H01R 4/00 H02G 5/08

Claims (6)

(57) [Claims] 1. A lower bushing having a trough-shaped groove formed in a direction orthogonal to the center conductor at a head of a T-shaped insulating layer having a center conductor embedded in an axis, and a head at the head of the center conductor. A pressing electrode provided opposite to the head of the center conductor and having an end of the connection conductor inserted therein; and a pressing electrode provided opposite to the head of the lower bushing, and the opposing surface being fastened by a fastener. Is a conductor connection portion comprising an upper bushing pressed against an opposing surface of the lower bushing. 2. A lower bushing having a trough-shaped groove formed in a direction perpendicular to the central conductor at a head of a T-shaped first insulating layer having a first central conductor embedded in an axis. A presser electrode provided to face the head of the first center conductor and having an end of the connection conductor inserted between the head of the first center conductor and the head of the lower bushing; A second central conductor is buried on the axis of the second insulating layer on the same axis as the first central conductor, and an opposing surface becomes an opposing surface of the lower bushing by fastening with a fastener. A conductor connection part comprising an upper bushing pressed so that the head of the second center conductor contacts the pressing electrode; 3. A first structure in which a plurality of first center conductors are embedded.
A lower bushing in which a gutter-shaped groove is formed in parallel with each of the center conductors in a direction perpendicular to the respective center conductors; and a first center provided in opposition to the head of the first center conductor. A holding electrode into which the end of the connection conductor is inserted between the head of the conductor and
A second bushing provided opposite to the head of the lower bushing;
A second center conductor is embedded in the axis of the insulating layer on the same axis as the first center conductor, and an opposing surface is pressed against an opposing surface of the lower bushing by tightening with a fastener. A conductor connecting portion comprising an upper bushing in which the head of the central conductor contacts the holding electrode. 4. A first structure in which a plurality of first center conductors are embedded.
A lower bushing in which a gutter-shaped groove is formed in parallel with each of the center conductors in a direction perpendicular to the respective center conductors; and a first center provided in opposition to the head of the first center conductor. A holding electrode into which the end of the connection conductor is inserted between the head of the conductor and
A second center conductor is buried in an axial center of a second insulating layer formed radially with respect to the head of the lower bushing, and is opposed to the head by fastening with a fastener. A conductor connection portion comprising an upper bushing whose surface is pressed against an opposing surface of the lower bushing and a head of the second center conductor contacts the pressing electrode; 5. A lower bushing in which a gutter-like groove is formed in a head portion of an insulating layer in which a plurality of first center conductors are buried, in a direction orthogonal to each of the center conductors, and the first center. A presser electrode provided opposite to the head of the conductor, the end of the connection conductor being inserted between the head of the first center conductor, and a presser electrode provided opposite to the head of the lower bushing; An upper bushing in which a second center conductor is housed in an axial center of an insulating cylinder radially formed with respect to the head, and the head of the second center conductor comes into contact with the holding electrode when tightened by a fastener. And a conductor connecting portion. 6. A trough-shaped groove is formed in a head portion of a first insulating layer buried in parallel so that a first center conductor is positioned at each vertex of a triangle in a direction orthogonal to each of the center conductors. A formed lower bushing, a pressing electrode provided to face a head of the first center conductor, and an end of a connection conductor inserted between the lower bushing and the head of the first center conductor; The second insulating layer is provided so as to face the head of the bushing.
Center conductor is embedded on the same axis as the first center conductor, and the opposing surface is pressed against the opposing surface of the lower bushing by fastening with a fastener, and the head of the second center conductor is placed on the pressing electrode. A conductor connection consisting of an upper bushing in contact with the conductor.