JPH11252723A - Gas insulated switchgear integrated with transformer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a transforming facility which is capable of reducing the area of facility site with a gas insulated switchgear and connecting them directly. SOLUTION: A gas insulated switchgear 2 made up of bushings 3, disconnectors 4, grounding switches 5, breakers 6 and connecting buses 7, 8 is provided on the top surface of a transformer 1. Outlets 10 to 12 of a three- phase main circuit are connected to the breakers 6 via oil-gas bushings 9 provided on the outlets 10 to 12, connecting buses 8 branched in a traverse direction on the top parts of the oil-gas bushing 9 and connecting buses 7 connected to the bottom parts of the breakers 6 and branched in the traverse direction. The grounding switches 5, the disconnectors 4 and the gas bushings 3 are connected to the top parts of the breakers 6. The gas insulated switchgear 2 is fixed to the fixing bases 13 of the transformer 1 by a frame 15.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transformer-integrated gas-insulated switchgear for substation equipment, and more particularly to a transformer-integrated gas-insulated switchgear in which a transformer and a gas-insulated switchgear are directly connected by a connection bus.

[0002]

2. Description of the Related Art A conventional gas-insulated switchgear and a transformer for substation equipment are shown in FIG. 1-7 of "Standardization of Gas-Insulated Switchgear", Vol. 39, No. 6, p. The gas-insulated switchgear and transformer were installed on separate and independent foundations, respectively, and the gas-insulated switchgear and transformer were horizontally arranged.

[0003]

As described above, when the gas insulated switchgear and the transformer are installed on separate independent foundations, there is a problem that an installation space is required for each of them and the site area is increased. For this reason, when installing in a suburban area or a mountainous area, it has been difficult to secure and develop land.

[0004] It is an object of the present invention to provide a transformer-integrated gas-insulated switchgear that can reduce the site area.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above objects, the present invention provides a main circuit drawer and a gas-insulated switchgear fixing seat on the upper part of a transformer, and increases the strength of the upper part of the transformer by increasing the strength of the transformer. A gas-insulated switchgear is mounted on the upper part of the transformer to enable integration of the transformer and the gas-insulated switchgear, and both the transformer and the gas-insulated switchgear can be installed in the transformer installation space.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 is a front view of a transformer-integrated gas-insulated switchgear showing the present embodiment, FIG. 2 is a side view as viewed from the direction of arrows AA in FIG. 1, and FIG. 3 shows the internal structure of FIG. FIG. 4 is a side view showing a modification of the present embodiment,
FIG. 5 is a longitudinal sectional view showing the internal structure of a transformer-integrated gas-insulated switchgear which is a modification of the present embodiment.

The gas-insulated switchgear integrated with a transformer according to the present embodiment has a gas-insulated switchgear 2 installed above a transformer 1 provided on the lower side. A fixing seat 13 for fixing the main circuit outlets 10, 11, and 12 and the gas insulated switchgear 2 is provided in the upper part of the transformer 1 in substantially three phases. An oil-gas bushing 9 is attached to the outlets 10, 11, and 12, and a connection bus 8 branched in the lateral direction is connected to an upper portion of the oil-gas bushing 9. Connection bus 8 is circuit breaker 6
Is connected via an insulating spacer 21 to a connection bus 7 branched in the lateral direction and connected to the lower part of the connection bus 7. The circuit breaker 6 is arranged horizontally so as to be substantially parallel to the upper surface of the transformer 1,
The upper part of the circuit breaker 6 is connected via a grounding switch 5 and a disconnector 4 to a connection bus 20 arranged substantially in parallel with the circuit breaker 6 via an insulating spacer 22. The gas bushing 3 is connected above the connection bus 20 via a current transformer 19, the gas bushing 3 is connected to a power transmission line 14, and external power is supplied to the transformer 1 via a gas insulated switchgear 2. Supplied to As described above, the gas insulated switchgear 2 includes the gas bushing 3, the disconnector 4, the ground switch 5, the circuit breaker 6, and the connection buses 7, 8. This gas insulated switchgear 2
Is fixed to the fixed seat 13 of the transformer 1 by the gantry 15.

In this embodiment, since the gas insulated switchgear 2 is installed in the empty space above the transformer 1 as described above, the foundation and the installation site for the gas insulated switchgear 2 are not required, and the substation is not required. Site area can be reduced. In addition, since the connection bus 20 is connected to the upper part of the circuit breaker 6 in the horizontal direction, the drawing direction of the bushing 3 can be arbitrarily changed.
In the example shown in FIG. 4, the gantry 15 is provided on the side surface of the transformer 1, the connection bus 20 is provided in the direction opposite to the direction shown in FIG. 1, and the bushing 3 is provided in the direction opposite to the direction shown in FIG. 1. I have.

FIG. 5 is a longitudinal sectional view showing the internal structure of a transformer-integrated gas-insulated switchgear which is a modification of this embodiment. In this example, the transformer 1 and the gas insulated switchgear 2 are connected by an oil-gas spacer 16. The oil-gas spacer 16 is much lighter than the oil-gas bushing 9 so that the seismic performance is improved.

The transformer-integrated gas-insulated switchgear according to the present embodiment can install both the transformer and the gas-insulated switchgear in the installation space of the transformer, so that the site area is reduced and the construction work is reduced. Cost reduction can be achieved.

FIG. 6 is a longitudinal sectional view showing the internal structure of a transformer-integrated gas-insulated switchgear according to another modification of the present embodiment. In this example, the oil-gas spacer 16 is attached between the connection buses 7 and 8. Thus, FIG.
The mounting position of the oil-gas spacer 16 shown in FIG. 6 is not horizontally disposed directly below the circuit breaker 6, so that even if foreign substances such as decomposition products are generated during operation of the circuit breaker 6, the surface of the oil-gas spacer is not affected. Does not accumulate in harmful conditions.

FIG. 7 is a front view of a transformer-integrated gas-insulated switchgear in which the main circuit of the gas-insulated switchgear 2 is housed in one container, that is, a so-called three-phase batch-type gas-insulated switchgear is applied. . In the present embodiment, the outlet 10 is of a three-phase collective type and is provided in a concentrated manner on the side of the transformer 1. The outlet 10 is connected to a three-phase collective connection bus 8 via an oil-gas spacer 16 and is connected to a three-phase collective circuit breaker 6 installed on the side thereof. Above the circuit breaker 6, a disconnecting switch 4 and a grounding switch 5 are installed. The disconnector 4 and the earthing switch 5 are divided into three phases by connection buses, connected to the three-phase bushing 3 via the current transformer 19, and further connected to the transmission line 14. These bushings 3 are supported by a gantry 15 attached to a fixed seat 13 of the transformer 1.

As described above, since the connection bus 8, the circuit breaker 6, and the like are of a three-phase type, the configuration of the gas-insulated switchgear 2 installed on the transformer 1 can be simplified. Since the weight part can be installed at the center side of the, vibration resistance is good.

FIG. 8 is a side view of the transformer-integrated gas-insulated switchgear when the bushing 3 is a cable drawer. In this example, the bushing 3 is placed separately and connected to the bushing 3 by a cable drawer. With this configuration, the weight of the gas insulated switchgear can be reduced.

In each of the embodiments described above, a so-called horizontal circuit breaker in which the circuit breaker 6 is arranged horizontally with the transformer 2 has been described. However, a so-called vertical circuit breaker arranged vertically with the transformer 2 is described. It is also possible to apply a circuit breaker of the type.

As described above, with the configuration as in each embodiment, the gas insulated switchgear 2 can be installed in the empty space above the transformer 1, and the base and installation for the gas insulated switchgear 2 are provided. No need for a site. For this reason,
Not only is it easier to secure the site and create the land when installing in mountainous areas, etc.In the case of indoor installation, gas-insulated switchgears and transformers were conventionally installed on separate floors. It is possible to install both on one floor of the vessel.

[0017]

As described above, according to the present invention, in the case of a substation having a structure in which a transformer is connected to a gas-insulated switchgear, the gas-insulated switchgear can be installed in a space above the transformer. Since the transformer-integrated gas-insulated switchgear is used, both the transformer and the gas-insulated switchgear can be installed in the transformer installation space, and the substation site can be significantly reduced.

[Brief description of the drawings]

FIG. 1 is a front view of a transformer-integrated gas-insulated switchgear according to an embodiment of the present invention.

FIG. 2 is a side view seen from an arrow AA in FIG.

FIG. 3 is a longitudinal sectional view showing the internal structure of FIG. 2;

FIG. 4 is a side view showing a modification of the embodiment.

FIG. 5 is a longitudinal sectional view showing an internal structure of a transformer-integrated gas-insulated switchgear which is a modification of the present embodiment.

FIG. 6 is a longitudinal sectional view showing the internal structure of a transformer-integrated gas-insulated switchgear according to another modification of the present embodiment.

FIG. 7 is a front view showing another embodiment of the present invention.

FIG. 8 is a side view showing another embodiment of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Transformer, 2 ... Gas insulated switchgear, 3 ... Gas bushing, 4 ... Disconnector, 5 ... Grounding switchgear, 6 ... Circuit breaker, 7, 8
... Connecting bus, 9 ... Oil-gas bushing, 10,11,1
2 ... Drawer outlet, 13 ... Fixed seat, 14 ... Transmission line, 15 ...
Mounting stand, 16: oil-gas spacer, 17: cable head, 18: power cable, 19: current transformer, 20: connecting bus bar, 21, 22: insulating spacer.

Continuing from the front page (72) Inventor Hideaki Sato 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside the Hitachi, Ltd. Kokubu Plant (72) Inventor O ▲ Saki ▼ Makoto 4-33 Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture No. Chugoku Electric Power Co., Inc. (72) Inventor Seiji Kawasaki 4-33, Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture Chugoku Electric Power Co., Inc. (72) Inventor Yuichi Nishimura 4-33, Komachi, Naka-ku, Hiroshima City, Hiroshima Prefecture In-company (72) Inventor Satoru Fukuda 4-4-2, Oshu, Minami-ku, Hiroshima-shi, Hiroshima Inside China Electric Manufacturing Co., Ltd.

Claims (6)

[Claims] 1. A gas-insulated switchgear having a transformer, a circuit breaker, a disconnector, and a bushing installed on the upper surface of the transformer, and a connection bus connecting these components, and provided on the upper surface side of the transformer. The drawn out portion and the circuit breaker are connected by a first connection bus arranged substantially parallel to the upper surface of the transformer, and the circuit breaker and the bushing are connected substantially parallel to the disconnector and the upper surface of the transformer. A transformer-integrated gas-insulated switchgear connected via a second connection bus arranged. 2. A branch drawer provided on a side surface of the first connection bus, for connecting the outlet and the first connection bus via an oil-gas bushing or an oil-gas spacer. 2. The transformer-integrated gas insulated switchgear according to claim 1, wherein the switch is connected to a branch provided on a side surface of another connection bus connected to a lower portion of the circuit breaker. 3. An oil-insulated connection bus is connected to a lead-out portion of the transformer, a branch is provided on a side surface of the connection bus substantially in parallel with an upper surface of the transformer, and an oil-gas spacer is provided on the branch. The transformer-integrated gas-insulated switchgear according to claim 1, wherein a branch portion provided on a lower side surface of the circuit breaker is connected to the branch lead portion. 4. The transformer-integrated gas-insulated switchgear according to claim 1, wherein the gas-insulated switchgear is connected to a transmission line via a cable head. 5. The transformer-integrated gas-insulated switchgear according to claim 1, wherein three phases of the gas-insulated equipment such as the circuit breaker, the disconnector, and the connection bus are accommodated in one container. . 6. A bushing, wherein the circuit breaker is disposed in a horizontal direction substantially parallel to the transformer, and is disposed above the circuit breaker.
2. The transformer-integrated gas-insulated switchgear according to claim 1, wherein connection buses for connecting the external lead-out means such as a cable head and the circuit breaker are arranged in a horizontal direction.