JPH1014031A - Bushing mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce cost by simplifying the structure of a bushing mounting device for mounting bushings at both edge phases while it is inclined for a bushing at a center phase. SOLUTION: A main flange 31 and first and third adapter flanges 32u-32w that are bolted to a flange connection part provided at the main flange part 31 are provided. Each mounting flange 402 of bushings 4u-4w of three phases is brought into contact with the adapter flanges 32u-32w, and the mounting flange 402 of the bushing of each phase is bolted to a corresponding adapter flange. The flange contacting surfaces of the first and third adapter flanges 32u and 32w are inclined by a certain angle of θ for the flange contacting surface of the second adapter flange 32v. The bushings 4u-4w are clamped also to the flange connection part of the main flange 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bushing mounting device used for mounting a bushing on a container of an electric device such as a gas insulated switchgear.

[0002]

2. Description of the Related Art In an electric device such as a gas insulated switchgear, in which components of the device are housed in a container, a bushing is attached to the container, and the device in the container is connected to an external circuit or device through the bushing. To connect.

FIGS. 5 to 7 show a gas insulated switchgear installed in an electric station such as a substation as an example of an electric apparatus provided with a bushing. FIG. 5 is a side view in which a part of the housing is cut away to show the appearance of the main body part.
FIG. 6 is a rear view showing the appearance of the main body of the housing after removing the door on the back side of the housing, and FIG. 7 is a top view showing the appearance of the main body of the housing by removing a part of the ceiling of the housing. FIG. 8A is a sectional view showing a state in which a bushing is mounted by a conventional bushing mounting apparatus.
(B) is a front view of the bushing attachment device.

In FIGS. 5 to 7, reference numeral 1 denotes a box-shaped housing, in which a housing 1A is provided on the front side of the housing 1 and an equipment housing 1B is provided on the rear side. . Doors 1a and 1b are provided on the front and rear surfaces of the housing 1 to open the operation device storage room 1A and the device storage room 1B, respectively.

[0005] Reference numeral 2 denotes a main body portion of the gas insulated switchgear housed in the equipment storage chamber 1B of the housing 1. This main body portion includes a container 201 and constituent devices of the opening / closing circuit housed in the container 201 (FIG. (Not shown)). In the illustrated example, the container 201 includes three container elements 201a to 201c which are arranged vertically and connected to each other.
In the container 201, the components of a switching circuit such as a circuit breaker, a disconnecting switch, a grounding switch, a bus conductor, etc. are stored for three phases.

In the example shown in the figure, the uppermost container element 201a constituting the container 201 is provided with an opening for mounting a bushing which is opened on the back side of the container, and the bushing mounting device 3 'is provided in the opening. The bushings 4u to 4w of the first to third phases are attached via the same.

As shown in FIGS. 7 and 8, a conventional bushing mounting device 3 'includes a container mounting flange 301 connected to a flange 201a1 provided at an opening for mounting a bushing of a container 201, and The window 3 is disposed so as to close the window 301a provided in the window 301.
The first flange mounting plate 302 has a rectangular flange mounting plate 302 welded to the periphery of the first mounting flange 01a and first to third bushing mounting flanges 303u, 303v, and 303w having bushing through holes and welded to the flange mounting plate 302. I have.

The flange mounting plate 302 has a central portion having a uniform thickness and both wing portions formed so as to gradually decrease in thickness toward both ends. A flange connection surface 302v orthogonal to the central axis of the opening of the opening 201 is provided.
Both sides of v are flange connection surfaces 302u and 302w that are inclined at a fixed angle θ toward the container mounting flange 301 with respect to the flange connection surface 302v. The flange connection surface 3 is provided on the flange mounting plate 302.
First to third bushing through-holes 304u to 304w which are respectively opened to 02u to 302w are provided. First through third bushing through holes 304u-30
4w are provided with their respective centers located at the vertices of an isosceles triangle, and these through holes 304u to 304w
The first to third bushing mounting flanges 303u, 303v and 303w are welded to the peripheral edge of the bushing.

The first to third bushing mounting flanges 303u to 303w are formed of annular members having a uniform thickness in the circumferential direction, and their respective end surfaces abut the mounting flanges of the bushings 4u to 4w. It is a flange contact surface.

[0010] First to third phase bushings 4u to 4u
w is composed of a bushing body 400 made of an insulating material and a bushing conductor 401 penetrating through the bushing body. The bushing body 400 includes a first portion 400a disposed outside the container and a second portion 400b inserted into the container, and is provided at a boundary between the first portion 400a and the second portion 400b. A mounting flange 402 is formed. In the illustrated example, the first portion 400a is L
The second portion 400b is formed so as to have a character shape.
It is formed in a tapered shape in which the outer diameter gradually decreases toward its tip. At the ends of the first portion 400a of the first to third phase bushings 4u to 4w, cable terminal connecting portions 4ua to 4wa (see FIG. 6) for connecting the terminal portions of the cables are provided.

First to third phase bushings 4u to 4u
w is arranged in a state where the respective second portions 400b are inserted into the container through the bushing through holes formed in the bushing mounting flanges 303u to 303w and the bushing through holes 304u to 304w provided in the flange mounting plate 302, respectively. The respective mounting flanges 401 are provided with bushing mounting flanges 303u to 303u.
w is fastened by bolts. In the example shown in the figure, the flanges 303u and 303w for attaching the bushings 4u and 4w of the opposite phases are provided in a state of being inclined by the angle θ with respect to the flange 303v for attaching the bushing 4v of the central phase. The phase bushings 4u and 4w are attached to the central phase bushing 4v so as to be inclined outward by a fixed angle θ.

First to third phase bushings 4u to 4u
w terminal terminals 5ua to 5wa of the first to third-phase power receiving cables 5u to 5w, which are respectively set up from underground cable pits, are connected to the cable terminal connection portions 4ua to 4wa of w. Is bushing 4u-4w
Through each bushing conductor 401 of the container 201
Is connected to a predetermined device.

[0013] The three-phase power receiving cables 5u to 5w, which are set up from the underground cable pit, are first inserted in a lump into the zero-phase current transformer ZCT arranged below the central phase bushing 4v. You. The power receiving cables 5u to 5w penetrating through the zero-phase current transformer ZCT are separated above the zero-phase current transformer, and the cables 5u and 5w at both ends are connected to the container 20.
1 are started up through current transformers CTu and CTw supported near the vertical intermediate portion of 1 and are connected to cable terminal connections 4ua and 4wa of bushings 4u and 4w, respectively. Also, the power receiving cable 5v of the center phase is passed straight through the zero-phase current transformer ZCT, and then rises straight upward to directly connect the cable terminal connecting portion 4 of the bushing 4v.
connected to va.

An operation device and an operation panel for operating a switchgear such as a circuit breaker and a disconnector housed in the container 201 are stored in the operation device storage chamber 1A of the housing 1. A gas insulated switchgear is constituted by the main body portion 2 housed in the device housing room 1B and the operating devices housed in the operating device housing room 1A.

In the gas insulated switchgear shown in FIGS. 5 and 6, the cables 5u and 5w at both ends of the current transformers CTu and CTw, which pass through the center, are straightened up as they are to the bushings 4u and 4w. Need to connect.
Therefore, in the conventional bushing attachment device, the flange connection surfaces 3 provided on both wings of the flange attachment plate 302 are provided.
02u and 302w are inclined by an angle θ with respect to the central flange connection surface 302v, so that the bushings 4u and 4w at the opposite ends are inclined outward with respect to the central phase bushing 4v, and the ends of the bushings 4u and 4w. The center positions of the cable terminal connecting parts 4ua and 4wa provided in the current transformers CTu and CTw are respectively adjusted to the center positions.

[0016]

As shown in FIGS. 5 to 8, in the conventional bushing mounting device 3 ', the bushings 4u and 4w at both ends are inclined with respect to the bushing 4v at the center. In order to mount the container, the inclined flange connection surface 3 is attached to the container mounting flange 301.
A structure is adopted in which a flange mounting plate 302 having 02u and 302w is welded, and bushing mounting flanges 303u to 303w are further welded to the flange mounting plate 302.

As a result, the number of parts of the bushing mounting device is increased, which complicates the structure. In addition, since the manufacturing process requires a number of complicated welding operations, the cost is increased. It was inevitable.

Depending on the configuration of the electric equipment, it is necessary to mount the three-phase bushings in the same direction. However, in the conventional bushing mounting apparatus, the flange mounting plate 302 that determines the mounting direction of the bushing is mounted on the container. The flanges 303u to 303w which are welded to the flange 301 and further mount the bushing are provided on the flange mounting plate 30.
In the case where the mounting direction of the bushing is different, parts cannot be shared because the welding is performed on the bushing. Therefore, when it is necessary to mount the three-phase bushings in the same direction, it is necessary to prepare another bushing mounting device, which is uneconomical.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the number of parts compared with the prior art to simplify the structure and to reduce the cost by assembling without welding so as to reduce the cost. Is to provide.

[0020] Another object of the present invention is to partially dispose parts of the three-phase bushing when mounting the two-phase bushings at both ends thereof at an angle and when mounting the three-phase bushings in the same direction. An object of the present invention is to provide a bushing attachment device for electric equipment which can be shared and which has improved economic efficiency.

[0021]

SUMMARY OF THE INVENTION The present invention is directed to a first and third phase bushing having a first to third phase bushing having a mounting flange centered on a second phase bushing. And a bushing mounting device for mounting the bushing on each side of the bushing of the second phase and mounting the bushing to the container of the electric device.

The bushing mounting device according to the present invention comprises:
It is constituted by a main flange attached to close an opening provided in a container of an electric device, and first to third adapter flanges bolted to the main flange.

The main flange has first to third bushing through-holes through which bushings of the first to third phases respectively penetrate, and peripheral portions of the first to third bushing through-holes respectively correspond to flange abutments. The first to third flange connection portions having a contact surface are provided.

Each of the first to third adapter flanges has a bushing through hole through which a bushing of the first to third phases respectively penetrates, and one end and the other end in the axial direction are respectively a main flange connection surface and a flange. It is an abutment surface. The first to third adapter flanges have their respective main flange connection surfaces abutted against the flange abutment surfaces of the first to third flange connection portions of the main flange, and the first to third flanges are provided. It is fastened to the connection part by a flange fastening bolt.

The flange contact surfaces of the first to third adapter flanges and the flange contact surfaces of the first to third flange connection portions of the main flange are mounting flanges of the first to third phase bushings. And the first to third flange connection portions of the main flange and the first to third adapter flanges are respectively brought into contact with the first to third flange contact surfaces. A screw hole for screwing a bushing fastening bolt for fastening the mounting flange of the phase bushing is provided.

The first through third bushing through-holes of the main flange are provided so that their respective central axes extend in parallel, and the first through third flange connection portions have first through third flange contact surfaces, respectively. The third bushing is provided so as to be located on a plane orthogonal to the center axis of the through hole.

Further, in a state where the first to third adapter flanges are fastened to the first to third flange connection portions of the main flange, respectively, the flange contact surfaces of the first and third adapter flanges are respectively formed by the second and third adapter flanges. The flange contact surfaces of the first to third adapter flanges are directed in a direction inclined at a predetermined angle outward with respect to the direction of orientation of the flange contact surfaces of the second adapter flange. It is provided in a state inclined at a certain angle with respect to the contact surface.

As described above, the bushing mounting device is constituted by the main flange and the first to third adapter flanges bolted to the main flange, and the first and third adapter flanges are brought into contact with the flanges. When the surface is inclined with respect to the flange contact surface of the second adapter flange so that the bushings of both ends are mounted at an angle with respect to the bushing of the center phase, the bushing is mounted using only two kinds of parts. Not only can the device be constructed, but there is no need to perform troublesome welding during assembly, so that the cost of the bushing attachment device can be reduced.

As described above, if the screw holes for screwing the bolts for fastening the bushings are also provided in the flange connection portion of the main flange, the first to third adapters are removed and the first to third adapters are removed. By mounting the third phase bushing directly to the flange connection of the main flange, the three phase bushing can be mounted in the same direction. For this reason, the main flange can be shared between the case where the bushings of both ends are mounted at an angle and the case where the bushings of the three phases are mounted in the same direction, thereby increasing the economy.

[0030]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIGS. 1 to 4 show examples of the structure of a bushing mounting apparatus according to the present invention. FIG. 1 (A)
FIG. 1B is a cross-sectional view showing a state in which a bushing is mounted using the bushing mounting apparatus according to the present invention, and FIG.
FIG. 2 is a front view showing a configuration of a bushing attachment device according to the present invention, and FIGS. 2A and 2B are cross-sectional views each showing a state in which a bushing is attached to the bushing attachment device according to the present invention. FIG. 2B is a top view showing a cross section of a portion different from FIG. 2A.
FIG. 3 is an exploded perspective view showing the positional relationship between the components of the bushing attachment device according to the present invention and the bushing, and FIG. 4 shows a state in which the bushing is directly attached to the main flange of the bushing attachment device according to the present invention. It is sectional drawing of a half part.

In FIGS. 1 (A) and 1 (B), reference numeral 201 denotes a container for electric equipment, reference numeral 3 denotes a bushing mounting device according to the present invention, and reference numerals 4u to 4w denote bushings of first to third phases, respectively. In this example, it is assumed that a bushing is attached to a gas-insulated switchgear similar to that shown in FIGS. First to third phase bushings 4u to 4u
w is the same as that shown in FIGS. 5 to 7, and is composed of a bushing body 400 made of an insulating material and a bushing conductor 401 penetrating through the bushing body. 1st placed in
Part 400a and the second part 400 inserted into the container
b. A square mounting flange 402 is provided at the boundary between the first portion 400a and the second portion 400b.
Are formed, and bolt insertion holes 403 are provided at four corners of the mounting flange 402, respectively.

The bushing mounting device 3 according to the present invention
Is composed of a main flange 31 attached so as to close an opening for attaching a bushing of the container 201 of the electric device, and first to third adapter flanges 32u to 32w bolted to the main flange 31.

The main flange 31 is connected to the container 201 of the electric equipment.
20 provided in the opening for mounting the bushing
The main flange 31 is made of a flat metal plate having the same circular contour shape as the contour shape of 1a1, and the central axes Ou-Ou, Ov-Ov, and Ow-Ow extend in parallel with each other. Third bushing through holes 33u-3
3w is provided. These bushing through holes are
They are provided with their respective centers located at the vertices of an isosceles triangle.

The first to third bushing through holes 33u
The first to third flange contact surfaces 34ua to 34wa (see FIG. 3), each of which has an annular shape, are formed on the periphery of the open ends of the first to third flange contact surfaces 34ua to 34ua. Portions where 34wa are provided are first to third flange connection portions 34u to 34w, respectively.
In the present invention, the first to third flange contact surfaces 3
4ua to 34wa are formed in such a size that the mounting flanges 402 of the bushings 4u to 4w can be brought into contact with each other. First to third flange connection portions 34 of the main flange
u to 34w are provided with four bushing fastening screw holes 35 for screwing a bushing fastening bolt.
(See FIG. 3 and FIG. 4) are provided at equal angular intervals (90-degree intervals), and 4 for screwing bolts for fastening the first to third adapter flanges 32u to 32w.
Screw holes 36 for fastening two flanges (see FIGS. 2A and 3)
Are provided at equal angular intervals and shifted by 45 degrees with respect to the bushing fastening screw hole 35. That is, in the illustrated example, a total of eight screw holes are provided at equal angle (45 degree) intervals in each flange connection portion of the main flange, and every other screw hole is provided in every other of these eight screw holes. The four screw holes thus formed are bushing fastening screw holes 35, and the other four screw holes are flange fastening screw holes 36. First to third flange connection portions 34u-3
4w screw holes 35 for fastening bushings
Is the cable terminal connection part 4ua ~ of the bushing 4u ~ 4w
The bushings 4u to 4wa are mounted so that the 4was can be attached in a predetermined direction (vertically downward in the illustrated example).
It is arranged at a position corresponding to the position of the bolt insertion hole 403 provided on the 4w mounting flange 402.

On the outer peripheral portion of the main flange plate 31, a large number of bolt insertion holes h are provided at equal angular intervals for penetrating bolts used for connecting the main flange to a flange of a container of electric equipment. .

First to third adapter flanges 32u
To 32w are annular members having bushing through holes 32ua to 32wa inside which can be aligned with the first to third bushing through holes 33u to 33w of the main flange 31, respectively. The main flange connection surfaces 32ub to 32wb and the flange contact surface 32uc are flat at one end face and one end face at the other end in the axial direction, respectively.
It is 32 wc. The first to third adapter flanges 32u to 32w are connected to the respective main flange connection surfaces 3.
2ub to 32wb are arranged in contact with the first to third flange contact surfaces 34ua to 34wa of the main flange 31.

The first to third adapter flanges 32u
To 32w have respective flange contact surfaces 32uc to 32uc.
Four bushing fastening screw holes 37 opened at wc are provided at equal angular intervals (90-degree intervals), and four bolt through holes 38 are provided at equal angular intervals and with respect to the bushing fastening screw holes 37. It is provided with the position shifted by 45 degrees. First to third adapter flanges 32u to
32w is the four bolt through holes 3 provided in each of them.
8 to the first to third flange connection portions 34 of the main flange.
2A are arranged in a state where they are aligned with the four flange fastening screw holes 36 provided in each of a to 34w.
As shown in the figure, the flange fastening bolt 4 screwed into the flange fastening screw hole 36 through each bolt through hole 38
0, the first to third adapter flanges 32u to 32u to
32w are fastened to the first to third flange connection portions 34u to 34w of the main flange, respectively. Each bolt through hole 3 provided in the first to third adapter flanges
8, a counterbore is provided, and in a state where the first to third adapter flanges 32u to 32w are fastened to the main flange, the head of the flange fastening bolt 40 does not project from the flange contact surfaces 32uc to 32wc. It has become.

The first to third adapter flanges 32u
Contact surfaces 32uc to 32wc of the first to third phases are formed so as to be able to contact the mounting flanges 402 of the bushings 4u to 4w of the first to third phases. Flange 32u-3
In a state where 2w is fastened to the first to third flange connection portions of the main flange 31, respectively, the flange contact surfaces 32uc and 32wc of the first and third adapter flanges respectively contact the flange contact of the second adapter flange 32v. Surface 32vc
The flange contact surfaces 32uc and 32wc of the first to third adapter flanges are directed to the direction inclined at a fixed angle θ outward with respect to the direction of the second adapter flange. Are provided at a predetermined angle with respect to

More specifically, the flange contact surface 32vc of the second adapter flange 32v is parallel to the main flange connection surface 32vb of the second adapter flange and perpendicular to the center axis of the bushing through hole 32va. In the state where the second adapter flange 32v is attached to the main flange 31, the flange contact surface 32vc
Is parallel to the plate surface of the main flange 31, and the second through hole 33v
Are oriented in a direction along the central axis.

On the other hand, the flange contact surface 32uc of the first adapter flange 32u is connected to the center axes Ou-Ou and Ow-O of the first and third bushing through holes 33u and 33w.
w, and on a plane perpendicular to the plate surface of the main flange 31 so as to be orthogonal to a straight line Au-Au inclined outward by a certain angle θ with respect to the center axis Ou-Ou of the first bushing through-hole 33u. In the state where the first adapter flange 32u is attached to the main flange 31, the flange contact surface 32uc is located outside the plate surface of the main flange and the flange contact surface 32vc of the second adapter flange 32v. At an angle θ.

The flange abutment surface 32wc of the third adapter flange 32w is connected to the center axes Ou-Ou and Ow-Ow of the first and third bushing through holes 33u and 33w.
And a third on a plane orthogonal to the plate surface of the main flange 31.
The third adapter flange 3 is provided so as to be orthogonal to a straight line Aw-Aw which is inclined outward by a fixed angle θ with respect to the center axis Ow-Ow of the bushing through hole 33w.
With the 2w attached to the main flange 31, the flange contact surface 32wc is inclined outward by an angle θ with respect to the plate surface of the main flange 31 and the flange contact surface 32vc of the second adapter flange 32v. I have.

Using the bushing mounting device described above, the second-phase bushing 4v is mounted in a direction perpendicular to the plate surface of the main flange (a direction along the central axis of the second bushing through-hole 33v). When the bushings 4u and 4w of the first and third phases are attached with the bushings 4u and 4w facing the outside of the second phase, respectively, the first to third adapter flanges are fastened to the main flange. The second portion 400b of the bushing body of each of the bushings 4u to 4w is connected to the bushing through holes 32ua to 32wa of the first to third adapter flanges and the main flange 3.
First to third bushing through holes 33u to 33w
Through the first and third adapter flanges 32.
u-32w is brought into contact with the flange contact surface. Then, a bolt insertion hole 403 provided in each mounting flange 402 of the first to third phase bushings 4u to 4w.
Through the first to third adapter flanges 32u-3
A bushing fastening bolt 41 is screwed into the 2w bushing fastening screw hole 37, and the bolt 41 is tightened, so that the first to third phase bushings 4u to 4w are connected to the first to third adapter flanges 32u to 32w. 32w.

The bushing 4u of the first to third phases
To 4w in a direction orthogonal to the plate surface of the main flange (a direction along the central axis of the first to third bushing through holes 33u to 33w), the first to third adapter flanges 32u are attached. 4W, the mounting flanges 402 of the first to third phase bushings 4u to 4w are attached to the main flange 3 as shown in FIG.
The first flange contact surfaces 34ua to 34wa are brought into contact with each other. Then, the bushing fastening bolts 41, which are passed through the bolt insertion holes provided in the mounting flanges 402 of the bushings 4u to 4w, are screwed into the screw holes 35 provided in the flange connection portions 34u to 34w. Then, the bushings 4u to 4w are fastened to the main flange 31.

Although not particularly mentioned in the above description, the area between the main flange 31 and the flange of the container of the electric equipment, between each adapter flange and the main flange, and between the mounting flange of the bushing and the flange contact surface of the adapter flange. Alternatively, a sealing material such as an O-ring is arranged between the main flange and the flange contact surface as necessary.

In the above example, the bushing of the second phase disposed in the center and the bushings of the first and third phases disposed on both sides thereof are positioned at three vertices of an isosceles triangle. However, the present invention can be applied to a case where the bushings of the first to third phases are arranged in a straight line.

In the above example, the case where the bushing is attached to the container of the gas insulated switchgear has been taken as an example. However, the present invention can be applied to the case where the bushing is attached to the container of other electric equipment such as a transformer. Of course you can.

[0047]

As described above, according to the present invention, the first and third bushing attachment devices are constituted by the main flange and the first to third adapter flanges bolted to the main flange. Since the flange contact surface of the third adapter flange is inclined with respect to the flange contact surface of the second adapter flange, the two-phase bushings are attached to be inclined with respect to the central phase bushing. Not only can the bushing mounting device be constituted by the above components, but also it is not necessary to perform troublesome welding during assembly, so that the cost of the bushing mounting device can be reduced.

According to the present invention, the flange connection portion of the main flange is also provided with a screw hole for screwing a bolt for fastening the bushing, and the first to third adapters are removed with the first to third adapters removed. Since the third phase bushing can be directly attached to the flange connection portion of the main flange, it can be mainly used for attaching the bushings of both ends at an angle and attaching the three phase bushings in the same direction. The economy can be improved by sharing the flange.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view showing a state in which a bushing is mounted by a bushing mounting apparatus according to the present invention. (B) is a front view of the bushing attachment device.

FIG. 2A is a top view showing a state in which a bushing is attached to a bushing attachment device according to the present invention, and FIG. 2B is a top view showing a state in which the bushing is attached to the bushing attachment device. FIG. 4 is a top view showing a cross section of a different part from FIG.

FIG. 3 is an exploded perspective view showing a positional relationship between components of the bushing attachment device and the bushing according to the present invention.

FIG. 4 is a cross-sectional view showing a state in which a bushing is directly attached to a main flange of the bushing attachment device according to the present invention.

FIG. 5 is a side view showing an external appearance of a main body portion of a gas insulated switchgear as an example of an electric device using a conventional bushing attachment device, in which a part of a housing of the gas insulated switchgear is cut away.

FIG. 6 is a rear view of the gas insulated switchgear of FIG. 5 with the door on the back side removed to show the appearance of the main body thereof.

FIG. 7 is a top view showing the appearance of the main body with a part of the ceiling of the housing of the gas insulated switchgear of FIG. 5 removed.

FIG. 8A is a cross-sectional view showing a state where a bushing is mounted by a conventional bushing mounting apparatus. (B) is a front view of the bushing attachment device.

[Explanation of symbols]

 Reference Signs List 3 bushing attachment device 31 main flange 32u-32w first through third adapter flanges 33u through 33w first through third bushing through holes 34u through 34w first through third flange connection portions 34ua through 34wa first through third Flange contact surface 35 bushing fastening screw hole 36 flange fastening screw hole 37 bushing fastening screw hole 38 bolt insertion hole 4u to 4w first to third phase bushing 402 mounting flange

Claims (1)

[Claims] A first to a third having a mounting flange.
The bushing of the second phase is centered with the bushing of the second phase, and the bushings of the first and third phases are respectively positioned at the second.
A bushing mounting device that is mounted on a container of an electric device while being positioned on both sides of the bushing of the first phase, having first to third bushing through holes through which the bushings of the first to third phases are respectively passed; The first
In addition, the peripheral portions of the through bushing through holes are first to third flange connection portions each having a flange contact surface, and are attached so as to close an opening provided in a container of the electric device. A main flange, having a bushing through-hole through which the bushings of the first to third phases respectively penetrate, one end and the other end of each of the axial directions are a main flange connection surface and a flange contact surface, respectively; The respective main flange connection surfaces are brought into contact with the flange contact surfaces of the first to third flange connection portions of the main flange, and are fastened to the first to third flange connection portions by flange fastening bolts. A first to a third adapter flange, a flange contact surface of the first to the third adapter flange, and a first to a third of the main flange. The flange contact surface of the flange connection portion is formed so that the mounting flange of the bushing of the first to third phases can be contacted, and the first to third flange connection portions of the main flange and the first The third to third adapter flanges are provided with screw holes for screwing bushing fastening bolts for fastening the first to third phase bushing mounting flanges abutting on the respective flange contact surfaces, The first to third bushing through-holes of the main flange are provided so that their respective central axes extend in parallel, and the first to third flange connection portions have first to third flange contact surfaces. 3 is provided so as to be located on a plane orthogonal to the center axis of the bushing through-hole of the third bushing. Direction in which the flange contact surfaces of the first and third adapter flanges are inclined outward by a certain angle with respect to the direction of the flange contact surface of the second adapter flange, respectively, in a state of being fastened to the flange connection portions of A bushing characterized in that the flange contact surfaces of the first to third adapter flanges are provided at a predetermined angle with respect to the flange contact surfaces of the second adapter flange so as to be directed to Mounting device.