JPH10150707A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the gas leakage by making the intervals of bolts located at the length sides of a frange smaller than the intervals of bolts located at the other places. SOLUTION: The intervals of bolt holes 5 at the length sides (a) and (b) of a junction face between franges 47 and 48 of a container are made smaller than the intervals of bolt holes 5 of the other places. The intervals of bolt holes 5 at the breadth sides (c) and (d) are made larger than the intervals of the bolt holes 5 at the length sides (a) and (b) and smaller than the intervals of the bolt holes 5 of the other places. An 0-ring 6 is mounted on the frange 48 and then is compressed by tightening the franges 47, 48 by means of a bolt 7, a washer 8, and a nut 9 and thereby the franges 47, 48 are airtightly joined to each other. The intervals of the bolt holes at the length sides (a) and (b) are made smaller than the intervals of the bolt holes of the other places, and so a large binding strength can be obtained at the length sides. Owing to this structure, the binding strength at the length sides which receive large stress due to gas pressure becomes large and thereby the deformation of the franges can be prevented without increasing the number of bolts and, as a result, the gas leakage can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear capable of obtaining a proper flange joint by suppressing deformation of a flange.

[0002]

2. Description of the Related Art FIG. 19 is a front view showing a part of a conventional three-phase batch gas insulated switchgear disclosed in Japanese Patent Application No. 8-136602 filed by the same applicant. 20 is a plan view showing a cross section of a main part in FIG.
1 is a top view showing a flange connection portion in FIG. 19, FIG. 22 is a cross-sectional view taken along line XXII-XXII in FIG.
FIG. 20 is a schematic view showing the undulation of the flange surface in FIG. 19.

In FIGS. 19 and 20, reference numeral 1 denotes a cylindrical member having a ratio of a major axis to a minor axis of 4: 3 and an elliptical cross section, and 2 is attached to both ends of the cylindrical member 1. An elliptical flange 3 is formed in a cylindrical member having a ratio of a major axis to a minor axis of 4: 3 and having an elliptical cross section, and 4 is an elliptical cylinder attached to both ends of the cylindrical member 3. It is a flange.
Here, a plurality of bolt holes 5 are formed at equal intervals in each of the flanges 2 and 4, as shown in FIG. Then, as shown in FIG. 16, each of the flanges 2,
The O-ring 6 is disposed between the O-ring 4 and the O-ring 4.

[0004] Reference numeral 10 denotes a connection port formed on one of the short diameter sides of the cylindrical member 1, and a connection flange is formed at an end. Reference numeral 11 denotes a connection port formed on one of the short diameter sides of the cylindrical member 3, and a connection flange is formed at an end. 12
Is a connection port formed on the other side on the short diameter side of the tubular member 3, and a connection flange is formed at an end. Reference numeral 13 denotes a bottom plate that closes the lower side of the tubular member 3, and 14 denotes a lid plate that closes the upper side of the tubular member 1. Then, in the above 1 to 14, the container 1
5 are formed, the container 15 and the bottom plate 13 and the lid plate 14
Although not shown, similar to the flanges 2 and 3, the O-ring 6 is interposed therebetween and the bolt 7, the washer 8, and the nut 9 are airtightly connected.

Reference numeral 16 denotes circuit breakers for three phases arranged at predetermined intervals in the longitudinal direction of the container 15, and 17, 18, and 19 denote insulating spacers for hermetically closing the connection ports 10, 11, and 12, respectively. Three-phase conductor 20 embedded in the part,
21 and 22 are provided. 23 is a cylindrical container air-tightly connected to the connection port 10 via an insulating spacer 17;
Is a cylindrical container air-tightly connected to the connection port 11 via an insulating spacer 18;

Reference numerals 25 and 26 denote cylindrical containers 2 respectively.
The three-phase main buses 27 and 28 accommodated in 3 and 24 are disconnectors whose one ends are connected to the main buses 25 and 26 and the other ends are connected to the conductors 20 and 21, respectively. Insulating spacers that hermetically close both ends of the containers 23 and 24 support the main buses 25 and 26 for three phases, respectively. 31 is one end of each phase of the circuit breaker 16 and the conductors 20 and 21
And 32, a conductor connecting the other end of each phase of the circuit breaker 16 and the conductor 22. Reference numerals 33 and 34 denote grounding switches arranged in the container 15, respectively.

A cylindrical member 35 is formed so that the ratio of the major axis to the minor axis is 4: 3 and has an elliptical cross section. Reference numeral 36 denotes elliptical flanges attached to both ends of the cylindrical member 35, respectively. Reference numeral 37 denotes a connection port formed on the lower side of the tubular member 35, and a connection flange is formed at an end. Reference numeral 38 denotes a bottom plate for closing the lower side of the cylindrical member 35, and 39 denotes a cylindrical member 3
5 is a lid plate for closing the upper side of 5. Here, the cylindrical member 3
5, the O-ring 6, the plurality of bolts 7, the washer 8,
And airtightly connected by a nut 9. Then, the container 40 is formed by the above 35 to 39. The container 40 has a connection port 37 connected to the connection port 12 of the container 15 via an insulating spacer 19.

Reference numeral 41 denotes a three-phase cable head accommodated in the container 40 in the longitudinal direction, reference numeral 42 denotes a line disconnector for the three phases accommodated in the container 40, and reference numeral 43 denotes each phase of the line disconnector 42. A conductor connected to the circuit breaker 16 via the conductors 22 and 32, a conductor 44 connecting each phase of the cable head 41 and each line disconnecting switch 42, and a ground switch 45 arranged in the container 40. , The conductor 44 is grounded. And
The insulating gas 46 is sealed at a predetermined pressure in the elliptical container 15, the cylindrical containers 23, 24, and the elliptical container 40 divided by the respective insulating spacers 17, 18, 19, respectively. I have.

Next, the operation will be described. 13 and 14, the power supplied from main bus 25 or 26 is supplied to circuit breaker 1 via disconnector 25 or disconnector 26.
6. Power is transmitted to the line through the line disconnector 42 and the cable head 41.

[0010]

Since the containers 15 and 40 in the conventional gas insulated switchgear are formed in an elliptical shape as described above, the pressure of the sealed insulating gas 46 is increased in the major axis direction and the minor axis direction. In contrast to this, since it is non-uniform in the circumferential direction, bending stress occurs in the body part in the direction approaching the cylindrical shape,
As shown in FIG. 23, a force is generated on the flanges 3 and 4 so as to deform into a undulating shape. Therefore, the force acting on each bolt 7 is not uniform in the circumferential direction. If the bolts 7 are arranged at equal intervals in accordance with the pitch on the long diameter side where the surface pressure is low to endure, there is a problem that a large number of bolts 7 are required.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and a gas insulation capable of preventing gas leakage by suppressing deformation of a flange and obtaining an appropriate flange joint portion. It is an object to provide a switchgear.

[0012]

According to a first aspect of the present invention, there is provided a gas insulated switchgear in which an electric device is housed in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section. In a gas-insulated switchgear in which a flange formed at an end of a container is joined by a plurality of bolts, a gap between bolts arranged on a long diameter side of the flange is smaller than a gap between bolts arranged at other positions. It was made.

According to a second aspect of the present invention, there is provided a gas insulated switchgear, in which an electric device is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section. In the gas insulated switchgear in which the flanges formed in the above are connected by a plurality of bolts, the diameter of the bolt arranged on the longer diameter side of the flange is made larger than the diameter of the bolt arranged at another position.

According to a third aspect of the present invention, there is provided a gas insulated switchgear, in which an electrical device is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section. In the gas-insulated switchgear in which the flange portion formed in the flange is connected with a plurality of bolts, the bolt on the long diameter side of the flange uses a high-strength bolt and the head has a different shape from the head of the bolt arranged at another position It was done.

According to a fourth aspect of the present invention, there is provided a gas insulated switchgear according to the third aspect, wherein a seat portion of a lance for fastening a high-strength bolt has a different shape from a seat portion for fastening another bolt. is there.

According to a fifth aspect of the present invention, there is provided a gas insulated switchgear, in which an electrical device is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section. In the gas-insulated switchgear in which the flanges formed in the above are connected with a plurality of bolts, the thickness of the flange on the major diameter side is made thicker than other portions.

A gas-insulated switchgear according to a sixth aspect of the present invention is the gas-insulated switchgear according to the fifth aspect, wherein the major diameter side of the flange is cut off.

In a gas insulated switchgear according to a seventh aspect of the present invention, an electric device is accommodated in a container having a substantially cylindrical cross section filled with an insulating gas at a predetermined pressure and formed at an end of the container. In the gas insulated switchgear in which the flange portions are connected by a plurality of bolts, reinforcement is provided on the long diameter side inside the container.

Further, in the gas insulated switchgear according to claim 8 of the present invention, in claim 7, the reinforcing member is an arc-shaped plate member fixed along the inside of the container.

According to a ninth aspect of the present invention, in the gas insulated switchgear according to the ninth aspect, the reinforcing member is a plate-like member whose both ends are fixed to the container so as to bridge two positions inside the container. is there.

According to a tenth aspect of the present invention, in the gas insulated switchgear according to the seventh aspect, the reinforcement is a crescent-shaped plate member fixed in parallel with the flange along the outside of the container.

[0022]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1 FIG. Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a partially cutaway front view showing a three-phase package gas-insulated switchgear according to Embodiment 1 of the present invention, FIG. 2 is a top view showing a cross section of a main part in FIG. 1, and FIG. 1. FIG. 4 is a top view showing the flange connection portion in FIG.
FIG. 5 is a sectional view taken along the line V-IV, and FIG.

1 to 4, 1, 3, 5 to 12,
16 to 35, 37 and 41 to 46 are the same as those shown in FIGS. 19 and 20 showing the conventional gas insulated switchgear, and only the elliptical flange formed on the tubular member differs from the bottom plate and the lid plate. ing. 1 and 2, 47
Are flanges formed at both ends of the elliptical tubular member 1,
48 is a flange formed at both ends of the elliptical tubular member 3, 49 is a bottom plate facing the flange 48 and closing the lower side of the tubular member 3, 50 is a tubular member 1 facing the flange 47. Is a lid plate that closes the upper side of the cover. And the above 1,
The container 51 is formed of 3, 5 to 12, and 47 to 50.

Reference numeral 52 denotes an elliptical flange formed at both ends of the elliptical cylindrical member 35, 53 denotes a bottom plate that opposes the flange 52 and closes the lower side of the cylindrical member 35, and 54 denotes an opposing flange 52. And a lid plate for closing the upper side of the cylindrical member 35. Then, in the above 35, 37, 52 to 54, the container 5
5 are formed. Here, the flanges 47, 4 of the container 51
8, between the lid plate 50 and the flange 47, between the bottom plate 49 and the flange 48, and the lid plate 54 of the container 55.
As shown in FIGS. 3 and 4, the space between the flange 52 and the bottom plate 53 is connected to the space between the bottom plate 53 and the flange 52.

In FIGS. 3 and 4 showing the connection between the flanges 47 and 48 of the container 51, the connection surfaces of the flanges 47 and 48 have, as shown in FIG.
The spacing between the bolt holes (coupling holes) 5 is smaller than the spacing between the other bolt holes 5. The distance between the bolt holes 5 on the minor diameter sides c and d of the flange is greater than the distance between the bolt holes 5 on the major diameter sides a and b and greater than the distance between the other bolt holes 5. Then, as shown in FIG. 4, the O-ring 6 is mounted on the flange 48, and the O-ring 6 is compressed by the flanges 47, 48 by the bolt 7, the washer 8, and the nut 9 to be air-tightly connected. in this way,
If the distance between the bolts on the long diameter sides a and b is smaller than the distance between the other bolt holes, when the two flanges 47 and 48 are connected, as shown in the connection force curve of FIG. You can gain power.

As described above, according to the first embodiment, the bolts 7 arranged at the long diameter side of the flanges 47 and 48 are used.
Since the distance between the bolts 7 is smaller than the distance between the bolts 7 arranged at other positions, the bonding force on the long diameter side which receives a large stress due to gas pressure is increased, and the flange 47 can be used without increasing the number of bolts 7. 47 can be suppressed.

Embodiment 2 FIG. 6 is a top view showing a flange portion of the container in the gas insulated switchgear according to Embodiment 2 of the present invention, FIG. 7 is a front view showing the flange portion of FIG. 6,
FIG. 8 is a sectional view taken along line VIII-VIII in FIG. As shown in FIGS. 6 and 7, a plurality of bolt holes are formed in the flanges 56 and 57 in which the thicknesses of the longer diameter sides a and b are formed thicker than other portions, with the intervals of the bolt holes being equal.
The bolt holes 58 arranged on the longer diameter sides a and b have a larger diameter than the other bolt holes 5, and the bolt holes 58 on the longer diameter side have bolts 59, washers 60 and nuts 61 as shown in FIG.
The bolt holes 5 other than the longer diameter side are connected by a bolt 7, a washer 8, and a nut 9 smaller than the bolt 59, as in the first embodiment.

As described above, according to the second embodiment, the bolts 59 arranged on the longer diameter sides of the flanges 56 and 57 are
Since the diameter is larger than the other bolts 7, it is possible to increase the coupling force on the long diameter side which receives a large stress due to the gas pressure, and to suppress the deformation of the flanges 56 and 57 without increasing the number of bolts.

Embodiment 3 FIG. 9 is a top view showing a flange portion of a container in a gas insulated switchgear according to Embodiment 3 of the present invention, and FIG. 10 is a sectional view taken along line XX in FIG. As shown in FIG. 9, the plurality of bolt holes 5 are formed at equal intervals on the flanges 62, 63 having a longer thickness on the longer diameter side than other portions, and the longer diameter sides a,
A counterbore 64 having a predetermined diameter and depth is formed in the bolt hole 5 arranged at b. The bolt hole 5 has the first embodiment.
As shown in FIG. 4, they are connected by a bolt 7, a washer 8 and a nut 9. Further, as shown in FIG. 10, the bolt holes 5 arranged on the longer diameter side are joined by high-strength bolts 65 with holes having higher tensile strength than the bolts 7, washers 66, and nuts 61.

As described above, according to the third embodiment, the bolt 65 disposed on the long diameter side of the flanges 62 and 63 is
Since a high-strength bolt having a higher tensile strength than the other bolts 7 is used, the bonding force on the long diameter side which receives a large stress due to the gas pressure is increased, and the flange 6 can be used without increasing the number of bolts.
It becomes possible to suppress the deformation of 2, 63. Further, since the bolt 65 arranged on the long diameter side is a bolt with a hole, and the bolt 7 for coupling other parts is changed by changing the shape of the head, it is possible to prevent the use error of the bolt. It becomes possible. Further, since the counterbores 64 are formed in the bolt holes 5 where the high-strength bolts 65 are arranged, it is possible to prevent incorrect insertion.

Embodiment 4 FIG. FIG. 11 is a top view showing a flange portion of a container in a gas-insulated switchgear according to Embodiment 4 of the present invention, and FIG. 12 is a cross-sectional view taken along line XII-XII in FIG. As shown in each figure, the flange 68,
The ends of the major-diameter sides a and b are cut out by predetermined dimensions, a plurality of bolt holes 5 are formed in each of the flanges 68 and 69, and the distance between the bolt holes 5 arranged on the major-diameter sides a and b is changed. Smaller than the interval between the bolt holes 5 arranged in the portion of
The distance between the bolt holes 5 arranged on the shorter diameter sides c and d is set to be larger than the distance between the bolt holes 5 arranged on the longer diameter side and smaller than the distance between the bolt holes 5 arranged on other parts. In the same manner as in the first embodiment, they are connected by bolts 7, washers 8, and nuts 9 as shown in FIG. Reinforcing members 70 and 71 are attached to the inside 5 of the long diameter sides a and b of the containers 1 and 3, respectively.

As described above, according to the fourth embodiment, the long sides of the flanges 68 and 69 are cut out, and the flange 6
The spacing between the bolts 5 arranged on the major diameter side of the tubes 8 and 69 is made smaller than the spacing between the bolts 5 arranged on the other side, and the reinforcing members 70 and 71 are attached inside the containers 1 and 3. Therefore, it is possible to suppress the deformation of the flanges 68 and 69 which receive a large stress by the gas pressure without increasing the number of the bolts 7, and it is possible to reduce the size by cutting out the long diameter side.

Further, in FIG. 13 showing the upper surface of the flange portion of the container in the gas insulated switchgear different from FIG. 11, and FIG. 14 showing a cross section taken along the line XIV-XIV in FIG. A bolt 74 is formed and fixed to the end of the container 1. An arc-shaped plate member 74 is fixed to the container 1 along the inside of the long diameter sides a and b of the container 1. Of the container 3 having the bolt holes 5 formed therein.
A flange 75 fixed to the end of the container 3 is an arcuate plate member fixed to the container 3 along the inside of the major diameter sides a and b of the container 3. In this way, when the major diameter sides a and b of the containers 1 and 3 are reinforced by the arcuate plate members 74 and 75, the deformation of the flanges 72 and 73 which receive a large stress by the gas pressure without increasing the number of bolts 7 is suppressed. It is possible to do.

Further, in FIG. 15 showing the upper surface of the flange portion of the container in the gas insulated switchgear different from FIG. 13, and FIG. 16 showing a cross section taken along line XVI-XVI in FIG. Both ends of the container 1 are connected so as to bridge two positions inside the major diameter sides a and b of 1, 3
3 is a plate-like member fixedly attached. Thus, container 1,
When the major diameter sides a and b are reinforced with plate members 74 and 75,
It is possible to suppress deformation of the flanges 72 and 73 that receive a large stress due to gas pressure without increasing the number of bolts 7.

In FIG. 17 showing the upper surface of the flange portion of the container in a gas insulated switchgear different from FIG. 15, and FIG. 18 showing a cross section taken along line XVIII-XVIII in FIG. 1,3
Is a crescent-shaped plate member to which the containers 1 and 3 are fixed in parallel with the flanges 72 and 73 along the outside of the major diameter sides a and b.
In this way, the long sides a and b of the containers 1 and 3 are connected to the plate members 76 and 7.
When reinforced by 8, the deformation of the flanges 72 and 73 which receive a large stress due to the gas pressure can be suppressed, and gas leakage can be prevented. In each of the above embodiments, the joint between the flanges formed on the tubular members 1 and 3 has been described as an example. However, for example, the present invention is also applicable to the joint between the lid plate 50 and the flange. Of course, the same effect can be exerted.

[0036]

As described above, according to the first aspect of the present invention, an electric device is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section. In the gas-insulated switchgear in which the flange portion formed in the flange is connected with a plurality of bolts, the interval between the bolts arranged on the longer diameter side of the flange is made smaller than the interval between the bolts arranged at other positions. Therefore, it is possible to obtain a gas-insulated switchgear capable of suppressing deformation of the flange without increasing the number of bolts.

According to the second aspect of the present invention, the electric equipment is housed in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and is formed at the end of the container. In a gas insulated switchgear in which the flange portion is connected with a plurality of bolts, the diameter of the bolt arranged on the long diameter side of the flange is set to be larger than the diameter of the bolt arranged at another position. A gas-insulated switchgear can be obtained that can suppress deformation of the flange without increasing the number.

According to the third aspect of the present invention, the electric equipment is housed in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and is formed at an end of the container. In a gas-insulated switchgear with flanges connected by a plurality of bolts, the bolts arranged on the major diameter side of the flanges use high-strength bolts, and the head has a different shape from the heads of the bolts arranged at other positions With this configuration, it is possible to suppress the deformation of the flange without increasing the number of bolts, and to obtain a gas-insulated switchgear in which the high-strength bolts can be easily identified.

According to a fourth aspect of the present invention, in the third aspect, the seat of the flange for fastening the high-strength bolt is formed in a different shape from the seat for fastening the other bolts. A gas-insulated switchgear that prevents erroneous insertion of a strength bolt can be obtained.

According to the fifth aspect of the present invention, the electric equipment is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and is formed at an end of the container. In a gas-insulated switchgear with a flange connected by a plurality of bolts, the thickness of the flange on the long diameter side is made thicker than other parts, so it is possible to suppress deformation of the flange without increasing the number of bolts A gas insulated switchgear can be obtained.

According to the sixth aspect of the present invention, since the long diameter side of the flange is cut off in the fifth aspect, a gas insulated switchgear which can be downsized can be obtained.

According to the seventh aspect of the present invention, the electric equipment is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and is formed at an end of the container. In the gas-insulated switchgear with the flange part connected by a plurality of bolts, the reinforcement is provided on the long diameter side of the container,
A gas insulated switchgear capable of suppressing deformation of the flange without increasing the number of bolts can be obtained.

According to an eighth aspect of the present invention, in the seventh aspect, since the reinforcement is constituted by an arc-shaped plate member fixed along the inside of the container, the flange can be deformed without increasing the number of bolts. Gas insulated switchgear can be obtained.

According to the ninth aspect of the present invention, in the seventh aspect, the reinforcement is constituted by a plate-like member whose both ends are fixed to the container so as to bridge two positions inside the container.
A gas insulated switchgear capable of suppressing deformation of the flange without increasing the number of bolts can be obtained.

According to the tenth aspect of the present invention, in the seventh aspect, the reinforcement is constituted by a crescent-shaped plate member fixed in parallel with the flange along the outside of the container, so that the number of bolts is increased. A gas insulated switchgear capable of suppressing deformation of the flange without the need for it can be obtained.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a three-phase batch gas insulated switchgear according to Embodiment 1 of the present invention.

FIG. 2 is a top view showing a main part in FIG. 1 in cross section.

FIG. 3 is a top view showing a flange connection part in FIG. 1;

FIG. 4 is a sectional view taken along the line IV-IV in FIG.

FIG. 5 is a curve diagram showing a coupling force of a flange.

FIG. 6 is a top view showing a flange portion of a container in the gas insulated switchgear according to Embodiment 2 of the present invention.

FIG. 7 is a front view showing the flange portion of FIG. 6;

FIG. 8 is a sectional view taken along the line VIII-VIII in FIG.

FIG. 9 is a top view showing a flange portion of a container in the gas insulated switchgear according to Embodiment 3 of the present invention.

FIG. 10 is a sectional view taken along line XX in FIG. 9;

FIG. 11 is a top view showing a flange portion of a container in a gas insulated switchgear according to Embodiment 4 of the present invention.

FIG. 12 is a sectional view taken along the line XII-XII in FIG.

FIG. 13 is a top view showing a flange portion of another container different from FIG. 11 of the gas insulated switchgear according to the fourth embodiment.

FIG. 14 is a sectional view taken along the line XIV-XIV in FIG.

FIG. 15 is a top view showing a flange portion of another container different from FIG. 13 of the gas insulated switchgear according to the fourth embodiment.

FIG. 16 is a sectional view taken along the line XVI-XVI in FIG.

FIG. 17 is a top view showing a flange portion of another container different from FIG. 15 of the gas insulated switchgear according to the fourth embodiment.

FIG. 18 is a sectional view taken along the line XVIII-XVIII in FIG.

FIG. 19 is a partially cutaway front view of a conventional gas insulated switchgear.

20 is a plan view showing a main part in FIG. 19 in cross section.

FIG. 21 is a top view showing a flange connection part in FIG. 19;

FIG. 22 is a sectional view taken along the line XXII-XXII in FIG.

FIG. 23 is a schematic diagram showing the undulation of the flange surface in FIG. 19;

[Explanation of symbols]

1 container, 3 containers, 7 volts, 16 electrical equipment, 4
6 Insulating gas, 47 flange, 48 flange.

Claims (10)

[Claims] An electric device is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and a flange formed at an end portion of the container is connected with a plurality of bolts. In the gas insulated switchgear, the interval between the bolts arranged on the major diameter side of the flange is smaller than the interval between the bolts arranged at other positions. 2. An electric device is housed in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and a flange formed at an end of the container is connected by a plurality of bolts. In the gas insulated switchgear, the diameter of the bolt arranged on the major diameter side of the flange is made larger than the diameter of the bolt arranged at another position. 3. An electric device is housed in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and a flange formed at an end of the container is connected by a plurality of bolts. In the gas insulated switchgear, the bolt arranged on the major diameter side of the flange is a high-strength bolt and its head is shaped differently from the head of the bolt arranged at another position. Gas insulated switchgear. 4. The gas-insulated switchgear according to claim 3, wherein the seat of the flange for tightening the high-strength bolt has a different shape from the seat for fastening the other bolts. 5. An electric device is housed in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and a flange formed at an end of the container is connected with a plurality of bolts. In a gas insulated switchgear, the thickness of the flange on the major diameter side is thicker than other portions. 6. The gas insulated switchgear according to claim 5, wherein a major diameter side of the flange is cut off. 7. An electric device is accommodated in a cylindrical container having an insulating gas filled at a predetermined pressure and having a substantially elliptical cross section, and a flange formed at an end of the container is connected by a plurality of bolts. A gas insulated switchgear, wherein reinforcement is provided on a major diameter side of the container. 8. The gas insulated switchgear according to claim 8, wherein the reinforcement is an arc-shaped plate member fixed along the inside of the container. 9. The gas insulated switchgear according to claim 6, wherein the reinforcement is a plate-like member whose both ends are fixed to the container so as to bridge two positions inside the container. 10. The gas-insulated switchgear according to claim 8, wherein the reinforcement is a crescent-shaped plate member fixed in parallel with the flange along the outside of the container.