JPH09233631A - Gas insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide structure of a gas insulated switchgear which can prevent malfunction of a driving part of structural elements due to electromagnetic field hindrance of a control circuit even if the apparatus is installed under the environment exposed to high electromagnetic field. SOLUTION: A box shape is formed by welding the coupling parts of the upper surface and side surface of a flat metal plate 9 and an external sheath 10 formed by welding a reinforcing pole 14 to the internal surface side of the metal plate 9 is provided so as to cover the body of a gas insulated switchgear(GIS) for the reinforcement. This outer sheath 10 is electrically connected, with a bolt or by welding, to an iron supporting plate 8 which is supporting the GIS body to form the GIS.

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 used in a power plant, a substation, etc., which is filled with a highly insulating gas, and in particular, a gas-insulated switch which can be stably operated even in an environment exposed to a high electric field magnetic field. The structure of an opening / closing device.

[0002]

2. Description of the Related Art FIG. 7 is an external view of a gas-insulated switchgear. As shown in FIG. 7, a gas-insulated switchgear (hereinafter referred to as GIS) 1 includes a high-voltage conductor such as a bus bar 2, a disconnector 3, and a circuit breaker 4.
And other components are hermetically housed in metal containers 5 that are filled with an insulating gas of SF ₆ and grounded, and a pedestal 6 that supports these metal containers 5 and an operating device that drives and operates the components described above. It is configured to be installed on a foundation 8a fixed to an iron support plate 8 together with a control panel 7 for controlling and monitoring. This GIS1 is advantageous as an electric power plant facility in urban areas where it is difficult to secure a site because the installation volume can be reduced by adopting insulating gas with high dielectric strength, and it is easy to perform maintenance and safety, and reliable. There is an advantage that it is highly reliable. In addition, even in ultra high voltage substations, etc.
Since the site can be significantly reduced by adopting No. 1, the application to substation facilities for electric power is being expanded.

The connection with the power transmission line for supplying power to the GIS of the above-mentioned power substation equipment is hung on the power transmission line tower,
It is conducted by pulling in from an overhead power transmission line in which an overhead ground wire is provided above the power transmission line to protect it from direct lightning strikes.
Intrusion of lightning into substation equipment such as GIS due to the direct lightning strike is the most severe as a lightning surge, and it may not be possible to completely protect it with a lightning arrester. In addition to blocking direct lightning strikes, the ground resistance is reduced to suppress the induced voltage.

[0004]

By the way, the influence of the lightning strike on the GIS is not only caused by the lightning surge from the overhead power transmission line which directly intrudes, but also when the GIS is installed directly under the transmission line tower. , Some are exposed to high electromagnetic fields and high electric fields generated by lightning currents due to direct lightning strikes on transmission line towers. As described above, the components of the GIS are housed in a grounded metal container made of iron, and the ordinary electromagnetic field is shielded by this metal container. It is difficult to completely shield against. This is also the case when exposed to the high electromagnetic fields generated by a nuclear explosion. G placed in a high electric field and magnetic field environment as described above
In the IS, there is a problem that the control circuit of the control panel for controlling the drive operation device of the component may malfunction due to the electromagnetic field and cause a serious accident in the entire power equipment.

The object of the present invention is to solve the above problems,
An object of the present invention is to provide a GIS structure capable of preventing the occurrence of accidents such as malfunction even when installed in an environment exposed to a high electromagnetic field.

[0006]

In order to solve the above-mentioned problems, the present invention has a structure in which the GIS is covered with an outer cover formed of an electromagnetic shield plate over the entire GIS body. As a result, even if the GIS is exposed to a high electromagnetic field from the outside,
By shielding with an electromagnetic shielding plate that covers the GIS main body, the influence of a high electromagnetic field can be prevented.

Further, the outer cover for covering the GIS can be easily manufactured by constructing the electromagnetic shield plate by welding.

Further, by adopting a prefabricated system for assembling the panel-like electromagnetic shield plate by bolting to the structure of the outer cover, the outer cover is not constructed by welding at the site where the GIS is installed. The number of assembly work steps can be reduced.

Further, a composite body in which an electromagnetic shield plate divided into L-shapes is flange-connected to each other to form a U-shaped outer composite body by bolt-bonding to each other at adjacent flange portions, and this connection. An outer cover is constituted by an end outer cover made of an electromagnetic shielding plate in which both ends of the body are flange-connected. As a result, when repairing or inspecting a GIS in which a plurality of units are combined, the outer cover part of the main part can be removed and work can be performed from the outside, so the space inside the outer cover can be set small and the structure of the outer cover is small. be able to.

[0010]

1 is a sectional view of a GIS according to an embodiment of the present invention. The GIS main body 1 is covered with a metal plate 9 to form an outer cover 10, and the outer cover 10 is electrically connected and coupled to an iron support plate 8 supporting the GIS main body 1 by bolts or welding and grounded. It constitutes GIS. It should be noted that the support plate 8 for grounding the outer cover 10 described above is constructed by combining iron columns,
The structure of covering the entire bottom part of the has a large effect of electromagnetic shielding. Further, as the metal plate 9 as the electromagnetic shield plate that constitutes the outer cover 10, an electromagnetic shield material such as an electromagnetic soft iron plate or a silicon steel plate can be used. In addition, a composite plate in which a good conductor such as a copper plate and the above-mentioned electromagnetic shield material are bonded together can be applied to further prevent the influence of an electric field. However, the outer cover 10 in the present invention is used as the metal plate 9. The structure using the iron plate described above is adopted. Hereinafter, the GIS jacket 1 of the present invention
A specific configuration of 0 will be described with reference to the drawings.

FIG. 2 is a perspective view of the GIS in which the outer cover according to the first embodiment of the present invention is partially crushed and shown. FIG.
The outer cover 10 shown in FIG. 1 includes a plurality of units 11a, 11b, 1
GIS in which 1c etc. are connected to each other at the busbar section 12
1 is an example of an outer cover that covers one outer cover. However, including the embodiments described later, the jacket structure according to the present invention can be applied to both a single unit and the GIS including a plurality of units described above. In the assembly of the jacket 10 in this embodiment, the flat metal plate 9 is joined by welding 13 at the joining portion of the upper surface and the side surface so that the outer shape becomes a box shape so as to cover the GIS main body 1. Formed and done. In order to reinforce the outer jacket 10, a reinforcing column 14 is welded to the inner surface of the metal plate 9 of the outer jacket 10. Further, doors 16 made of the above-described metal plate 9 that come in and out of the outer cover 10 are provided on both side surfaces 15 of the outer cover 10 or on one side wall surface 15.

3 and 4 show a GIS according to a second embodiment of the present invention, and FIG. 3 is a perspective view of an outer cover of the GIS.
FIG. 4 is a partial cross-sectional view of the joint portion of the metal plates forming the outer cover. The outer cover 10 shown in FIG. 3 is composed of a panel 17 made of a metal plate 9, at least the side wall surface 15 and the upper surface 15a are flat plate panels 17a, and the corner portion where the side wall surface 15 and the upper surface 15a are joined is L-shaped in section. -Shaped corner panel 17b and the corners of the jacket 10 are formed from the corner panel 17c. The adjacent portions of the panel 17 are mechanically and electrically coupled to each other at the joint portion 18 to form the jacket 10.

As shown in FIG. 4 (a), the above-mentioned joining portion 18 sandwiches the adjacent portion of the panel plate 17 with metal side plates 19 and 19 provided along both side surfaces of the adjacent portion. Then, it is formed by tightening with the bolt 20.
Further, as shown in (b), the joint portion 18 is a connecting portion 18a having an H-shaped cross section, and the groove portion 18 of the connecting portion 18a is formed.
It is also possible to form the outer cover 10 by inserting the panel 17 into b and connecting it by tightening with the bolt 20a.

FIGS. 5 and 6 show a GIS according to a third embodiment of the present invention, and FIG. 5 is a perspective view of a jacket portion of the GIS.
[FIG. 3] is a partial cross-sectional view of a joint portion of metal plates forming an outer cover.
The outer cover 10 covering the GIS main body is formed by forming an outer cover member 100b made of a metal plate having an L-shaped cross section by screwing between flanges 101b on the upper surface to form an outer cover member 110b having a U-shaped cross section. A box-shaped joined body is provided in which the upper and side surfaces are formed by screw-joining the adjacent flanges 102b at both ends of the U-shaped jacket member 110b, and the side wall surface 150 at the end in the width direction is provided.
a is flange-connected by a flat metal plate 9.

The joints between the L-shaped outer cover members 100b and between the U-shaped outer cover members 110b at the flanges 101b and 102b are, for example, as shown in FIG. It is possible to adopt any structure in which the bolt 21 is passed through and tightened, or as shown in (b), the side plate 22 having a U-shaped cross section which covers between the flanges is tightened with the bolts 22a and 22a from both end surfaces. .

[0016]

As described above, according to the present invention, G
The IS has a structure in which the entire GIS body is covered with an outer cover made of an electromagnetic steel plate. As a result, even if the GIS is exposed to a high electromagnetic field and a high electric field due to a lightning strike or the like, by shielding it with an outer cover composed of an electromagnetic shielding plate that covers the GIS main body,
Since it is possible to prevent malfunction of the component equipment due to electromagnetic field interference of the control circuit that controls the drive operation unit of the component equipment of the GIS, it is possible to prevent an accident from occurring in the substation equipment.

The GIS casing structure according to the present invention can be easily manufactured by constructing a metal plate made of iron by welding.

Further, since the outer cover has a panel type structure, it can be assembled at the installation location of the GIS body described above without welding work, and the number of assembly work steps can be reduced. . Further, from a combined body formed by flange-bonding a composite of an outer cover formed by connecting the electromagnetic shields divided into L-shapes into a U-shape, and an electromagnetic shield plate in which both ends of the combined body are flange-joined. When the outer cover is formed of the side wall surface, the assembly work of the outer cover is grounded.
It can be done from the outside of the S main body, and even when repairing the GIS main body with multiple units combined, it can be done easily by removing a part of the outer cover, so the work space inside the outer cover can be set small and compact. It is possible to have a different jacket structure.

The GIS comprising the jacket of the present invention is
By installing in a place located below the overhead ground wire provided along the upper side of the overhead power transmission line, the effect of the high electromagnetic field can be further reduced in combination with the shielding effect of the overhead ground wire.

Further, although the present invention has a structure in which the entire GIS is covered with an outer cover constituted by an electromagnetic shield plate, only the control panel is covered with the electromagnetic shield plate so as to shield the control circuit which is easily affected by the electromagnetic field. It is still effective to adopt the structure.

[Brief description of drawings]

FIG. 1 is a sectional view of a GIS according to an embodiment of the present invention.

FIG. 2 is a perspective view showing a partially crushed outer cover constituting the GIS of the present invention.

FIG. 3 is a perspective view showing a jacket of a different GIS of the present invention.

4 (a) is a cross-sectional view of a joint portion of a metal plate forming the outer cover of the GIS of FIG. 3, and FIG. 4 (b) is a cross-sectional view of a joint portion having a different structure.

FIG. 5 is a perspective view showing a jacket of still another GIS according to the present invention.

6 (a) is a cross-sectional view of a joint portion of a metal plate forming the outer cover of the GIS of FIG. 5, and FIG. 6 (b) is a cross-sectional view of a joint portion having a different structure.

FIG. 7 is an external view of a conventional GIS.

[Explanation of symbols]

 1 Gas Insulated Switch 5 Metal Container 8 Support Plate 10 Outer Cover 13 Welding 15 Side Wall 17 Panel 17a Flat Panel 17b Corner Panel 17c Each Panel 18 Joint 100b L-shaped Outer Member 110b U-shaped Outer Member

Claims (4)

[Claims] 1. A gas-insulated switchgear comprising a high-voltage conductor, a circuit breaker, a disconnecting switch, and other equipment housed in a grounded metal container filled with an insulating gas. A gas-insulated switchgear characterized by being covered with the constructed jacket. 2. The gas insulated switchgear according to claim 1, wherein an electromagnetic shielding plate is welded and joined to form an outer cover. 3. The gas-insulated switchgear according to claim 1, wherein a panel-shaped electromagnetic shield plate is bolted and assembled and joined to form an outer cover. 4. The gas-insulated switchgear according to claim 1, wherein the electromagnetic shield plates divided into L-shapes are flange-joined to form a U-shaped outer composite body at adjacent flange portions. A gas-insulated switchgear characterized in that an outer cover is composed of a joint body formed by bolting to the above and a side wall surface formed of an electromagnetic shielding plate in which both ends of the joint body are flange-joined.