JP2000224719A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear whose size is reduced. SOLUTION: This is a gas-insulated switchgear in which through-type current transformers 8a-8c provided around three-phase conductors 2a-2c respectively are arranged into a triangular shape on the same plane vertical to the center axis of the housing container 1, fixing legs 7a-7c are provided in the superfluous spaces between the housing container 1 and the current transformers 8a-8c, and the current transformers 8a-8c are directly fitted to these fixing legs 7a-7c.

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, and more particularly to a gas insulated switchgear suitable for reducing the size of a device and improving work efficiency.

[0002]

2. Description of the Related Art A conventional gas insulated switchgear is disclosed in
As disclosed in Japanese Patent Application Laid-Open No. 265504 and Japanese Patent Application Laid-Open No. 3-265405, a current transformer is mounted in a container. That is, the support plate is fixed to the flange of the storage container with bolts or the like,
The current transformer is extrapolated to the cylindrical container provided on the support plate, and a push plate with a shield for alleviating the electric field is applied from the opposite side of the support plate, and this and the support plate are fixed with fixing brackets such as bolts and nuts. The current transformer was mounted in the storage container. In addition,
As disclosed in Japanese Patent Application Laid-Open No. 52-1464, a wall bushing is provided in a storage container, and a current transformer is arranged at a grounding portion of the wall bushing, and the current transformer is attached in the same manner as described above.

[0003]

However, the conventional mounting method requires a number of components such as a support plate with a cylindrical container, a push plate with a shield for alleviating electric fields, and a fixing bracket, which complicates the mounting structure and makes the mounting work difficult. Was complicated. In addition, since the mounting structure is complicated and the inside of the storage container is almost completely filled, the size of the storage container cannot be reduced. Therefore, the operation efficiency of the conventional gas insulated switchgear is low, and the size of the device cannot be reduced.

An object of the present invention is to provide a gas insulated switchgear capable of improving work efficiency. It is another object of the present invention to provide a gas insulated switchgear that can be downsized.

[0005]

A first gas-insulated switchgear according to the present invention that achieves the above object is a through-type switching device provided for each of the three-phase conductors on the same plane perpendicular to the central axis of the storage container. Current transformers arranged in a triangular shape, with fixing legs provided in an excess space between the storage container and the through-type current transformer, and the through-type current transformers directly attached to the fixing legs It is.

A second gas-insulated switchgear according to the present invention that achieves the above object is a triangular through current transformer provided for each of the three-phase conductors on the same plane perpendicular to the central axis of the storage container. The fixing legs are provided between the storage container and the through-type current transformer so as to form an inverted triangle with respect to the arrangement shape of the through-type current transformer. The through current transformer is directly attached.

The first and second through-type current transformers have an insulating portion on the outer periphery of the secondary winding provided with conductivity and grounded, and the portion is molded. A connection portion with a fixing leg is provided.

A third gas-insulated switchgear according to the present invention that achieves the above object is a triangular through current transformer having a plurality of three-phase conductors provided on the same plane perpendicular to the central axis of the storage container. It is arranged in a shape, and as a through current transformer, the insulation is provided on the outer periphery of the secondary winding and grounded,
And while using the thing which gave the mold to the part,
A plurality of through-type current transformers are connected to each other, and one end thereof is attached to a fixing leg provided in the storage container.

[0009]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a sectional view showing a structure of a current transformer accommodating portion of a gas insulated switchgear according to a first embodiment of the present invention.
FIG. 2 is a sectional view taken along the line II-II of FIG. 1 in the drawing
Is a cylindrical storage container made of metal. One side of the storage container is connected to the storage container 6, and the other end is connected to the storage container 4 via the insulating spacer 3. The storage container 1 has a conductor 2
a to 2c are arranged in a triangular shape, and a contact 5
, And a conductor arranged linearly is connected to the storage container 6. The other side of the conductors 2a to 2c is linearly supported by an insulating spacer 3. The conductors 2a to 2c are provided with through-type current transformers 8a to 8c. Through current transformers 8a to 8c
Has a triangular shape on the same plane perpendicular to the central axis of the storage container 1.

On the same plane perpendicular to the central axis of the storage container 1 between the storage container 1 and the outer periphery of the through-type current transformers 8a to 8c, fixing legs of the through-type current transformers 8a to 8c are provided. 7a-7c
Are arranged so as to form an inverted triangle with respect to the arrangement shape of the through-type current transformers 8a to 8c, and are fixed to the inner peripheral surface of the storage container 1 by welding. A plurality of through holes are provided in the fixing legs 7a to 7c. By arranging the fixing legs 7a to 7c in an inverted triangular shape with respect to the arrangement shape of the through-type current transformers 8a to 8c in this manner, the fixing legs 7a to 7c are formed.
Can be provided in a surplus space between the storage container 1 and the outer periphery of the through-type current transformers 8a to 8c. Therefore, the size of the diameter of the storage container 1 is triangular.
It is determined only by the size of c, and it is not necessary to increase the diameter of the storage container 1 for the fixing legs 7a to 7c.

The through-type current transformers 8a to 8c are coated with an electrically conductive paint on the outer peripheral portion of the secondary winding and grounded, and an epoxy mold 9 is provided on the paint applied portion so that the current transformer main body can stand on its own. , A so-called through-mold current transformer. As described above, by using the molded type as the through-type current transformers 8a to 8c, components such as a shield pressing plate for alleviating electric field and a wall bushing can be omitted. Therefore, the mounting structure of the through-type current transformers 8a to 8c can be simplified. In addition, since the number of parts can be reduced, the size of the diameter of the storage container 1 is determined only by the size of the through current transformers 8a to 8c arranged in a triangular shape, and the diameter and the axial size of the storage container 1 are increased. No need to do.

A connection portion 19 having one or a plurality of mounting holes or grooves in the same direction as the axis of the ring core is provided at two opposite positions on the outer periphery of the mold portion 9. Through-type current transformer 8
When attaching the fixing legs 7a to 7c to the fixing legs 7a to 7c, the through holes provided in the fixing legs 7a to 7c and the mounting holes or grooves provided in the connecting portion 19 are aligned. Fix it. Secondary wiring 1 for through current transformers 8a to 8c
2 is connected to a sealed terminal 13 provided in a trap of the storage container 1.

According to the first embodiment described above,
Since the fixing legs 7a to 7c are provided so as to be in a triangular shape with respect to the triangular shape of the through current transformers 8a to 8c and the storage container 1, that is, the triangular shape of the through current transformers 8a to 8c. The size of the diameter of the container 1 is determined only by the size of the through current transformers 8a to 8c arranged in a triangular shape.
Can be reduced to just the outer peripheral surfaces of the through-type current transformers 8a to 8c.

Further, as the through-type current transformers 8a to 8c, a mold type, that is, a conductive paint is applied to an insulating portion on the outer periphery of the secondary winding and grounded, and an epoxy mold 9 is applied to the paint applied portion. Since the above-mentioned components are used, components such as a shield pressing plate for alleviating the electric field and a wall bushing can be omitted. Therefore, the mounting structure of the through-type current transformers 8a to 8c can be simplified. Also, since the number of parts can be reduced, the storage container 1
The diameters of the through current transformers 8a to 8 are arranged in a triangular shape.
It is determined only by the size of 8c, and the diameter and the axial dimension of the storage container 1 can be reduced.

FIG. 3 is a sectional view showing a structure of a current transformer accommodating portion of a gas insulated switchgear according to a second embodiment of the present invention. In the present embodiment, the molded through-type current transformers 8a to 8c and the through-type current transformers 14a to 14c are provided on the conductors 2a to 2c.
c, that is, a case where two through-type current transformers are attached to one phase. In this case, the stud bolts 15 are inserted into mounting holes or grooves provided in the through-type current transformers 8a to 8c and the through-type current transformers 14a to 14c, and one end thereof is provided with a fixing leg 7a provided in the storage container 1. ~ 7c
The other end is tightened with a nut 11. By doing so, the through current transformers 8a to 8c and the through current transformers 14a to 14a
4c while connecting one end thereof to the fixing leg 7a.
7c. The fixing legs 7a to 7c are fixed to the inner peripheral surface of the storage container 1 so as to form an inverted triangle with respect to the arrangement of the through-type current transformers 8a to 8c and the through-type current transformers 14a to 14c. .

In this embodiment, the eccentricity due to the load of the through-type current transformer, the fixing legs 7a to 7c and the stud bolt 1
5, the anti-fixing legs 7a to 7 of the storage container 1 are taken into consideration.
A seat 16 is fixed to the inner peripheral surface on the c side by welding, one end of a metal fitting 18 is fixed to the seat 16 with a bolt 17, and the other end of the metal fitting 18 is fixed to the other end of the stud bolt 15. Other configurations are the same as those of the first embodiment.

In the present embodiment, an example is shown in which the through-type current transformers 8a to 8c and the through-type current transformers 14a to 14c are separate from each other. When the through-type current transformer to be housed is used, the through-type current transformer can be mounted in the housing 1 as in the first embodiment described above.

According to the second embodiment described above,
When two through-type current transformers are attached to one phase, the through-type current transformers 8a to 8c and the through-type current transformers 14a to 14c are used as the through-type current transformers. Parts such as an electric field alleviating shield push plate and a wall bushing can be omitted. Therefore, the through current transformers 8a to 8
c, the mounting structure of 14a to 14c can be simplified. Also,
Since the number of parts can be reduced, the size of the diameter of the storage container 1 is triangular and the through current transformers 8a to 8c and 14a to 1
It is determined only by the size of 4c, and the diameter of the storage container 1 and the axial size can be reduced.

[0020]

According to the gas insulated switchgear of the present invention, the surplus space between the storage container and the through-type current transformer or the inverted triangular shape with respect to the arrangement of the through-type current transformer is formed. Since the fixing leg was provided and the through-type current transformer was directly attached to this fixing leg, the size of the diameter of the storage container was determined only by the size of the through-type current transformer arranged in a triangular shape. The diameter can be reduced to just below the outer peripheral surface of the through-type current transformer. Therefore, the size of the gas insulated switchgear can be reduced.

Further, according to the gas insulated switchgear of the present invention, a through-type current transformer is provided in which the insulating portion on the outer periphery of the secondary winding is electrically conductive and grounded, and the portion is molded. And one end is attached to the fixing leg provided in the storage container while connecting a plurality of through-type current transformers, so parts such as the electric field mitigation shield push plate and wall bushing can be omitted. In addition, the mounting structure of the through-type current transformer can be simplified. Accordingly, the work of mounting the through-type current transformer can be facilitated, and the working efficiency of the gas insulated switchgear can be improved. In addition, since the number of parts is reduced, the size of the diameter of the storage container is determined only by the size of the through-type current transformers arranged in a triangular shape, and the diameter and the axial size of the storage container can be reduced. Therefore, the size of the gas insulated switchgear can be reduced.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a structure of a current transformer accommodating portion of a gas insulated switchgear according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

FIG. 3 is a sectional view showing a structure of a current transformer accommodating portion of a gas insulated switchgear according to a second embodiment of the present invention.

[Explanation of symbols]

1, 4, 6: storage container, 2a to 2c: conductor, 3: insulating spacer, 5: contactor, 7a to 7c: fixing leg, 8a to 8
c, 14a to 14c: through-type current transformer, 9: mold, 1
0 ... bolt, 11 ... nut, 12 ... secondary wiring, 13 ... sealed terminal, 15 ... stud bolt, 16 ... seat, 17 ... bolt, 18 ... metal fittings, 19 ... connection part.

Continued on the front page (72) Inventor Soji Omori 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Kokubu Plant, Hitachi, Ltd. (72) Inventor Toyoichi Tanaka 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture F-term in Kokubu Plant of Hitachi, Ltd. (reference) 5G017 BB12 BB13 BB20

Claims (4)

[Claims] 1. A gas-insulated switchgear in which through current transformers provided for three-phase conductors are arranged in a triangular shape on the same plane perpendicular to the central axis of a storage container. Fixing legs are provided in the extra space between the current transformer,
A gas-insulated switchgear, wherein the through-type current transformer is directly attached to the fixing leg. 2. A gas-insulated switchgear in which through-type current transformers provided for three-phase conductors are arranged in a triangular shape on the same plane perpendicular to the central axis of the storage container. A fixing leg is provided between the transformer and the current transformer so as to form an inverted triangle with respect to an arrangement shape of the through-type current transformer, and the through-type current transformer is directly attached to the fixing leg. Characterized gas insulated switchgear. 3. The through current transformer according to claim 1, wherein the through-hole type current transformer has an insulating portion on the outer periphery of the secondary winding which is electrically conductive and grounded, and the portion is molded. The gas insulated switchgear according to claim 1 or 2, wherein a connection portion with a leg is provided. 4. A gas insulated switchgear in which a plurality of through-type current transformers provided for each of three-phase conductors are arranged in a triangular shape on the same plane perpendicular to the central axis of the storage container. As an insulating part around the secondary winding outer periphery is given conductivity and grounded, and a molded part is used, and one end of the current transformer is connected to the plurality of through-type current transformers. A gas insulated switchgear attached to a fixing leg provided in a storage container.