JP2001145220A - Gas insulation switch - Google Patents

Abstract

PROBLEM TO BE SOLVED: To downsize a gas insulation switch. SOLUTION: This gas insulation switch stores an insulator 26 with ground switch, a vacuum breaker 25, and bushing CT31 with current transformer in a tank 22, wherein the vacuum breaker 25 and the insulator 26 with ground switch are mounted on an insulation frame 24 for integration.

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, which is miniaturized by integrating and integrating devices.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional structure of a gas insulated switchgear in which a plurality of switches are accommodated in a tank filled with insulating gas.
Shown in

As shown in the figure, a tank 2 filled with an insulating gas is provided on a base 1 and a partition plate 3 is provided inside the tank 2.
Are divided into an upper chamber 4 and a lower chamber 5. A vacuum circuit breaker 6 for three phases, a current transformer (CT) 7 and a cable socket 8 are connected to the lower chamber 5 via conductors 9 and 10. The cable socket 8 is provided so as to penetrate the bottom surface of the tank 2.
Is connected. The partition plate 3 is provided with a three-phase insulating spacer 12 in which three-phase internal conductors 13 are molded in order to allow the conductor to pass through the partition plate 3 in an airtight manner. Connected through.

On the other hand, buses 16 for three phases are provided in the upper chamber 4 via insulators 15 in a direction perpendicular to the paper surface. The bus bar 16 is for connecting to the adjacent gas insulated switchgear constituting the train panel. In a portion where the bus bar 16 penetrates the tank 2, the hermeticity and insulation between the bus bar 16 and the tank 2 are reduced. Is held. In addition to the above, "open"
A disconnector 17 with a grounding switch for performing three operations of "closed" and "grounded" is accommodated, and a bus 16 and an inner conductor 1 are provided.
3 are connected.

An operation unit 18 for operating the vacuum circuit breaker 6 and a disconnector 1 with a grounding switch are provided outside the tank 2 and on the front side.
And an operation unit 19 for operating the control unit 7.

[0006]

However, since the vacuum circuit breaker and the disconnecting switch with the earthing switch are separately installed, the number of conductors for connecting them is increased, and the number of parts is increased. Not only that, the tank itself needs to be large, and the size of the gas insulated switchgear cannot be reduced.

Therefore, an object of the present invention is to provide a gas insulated switchgear which solves the above problem.

[0008]

According to a first aspect of the present invention, there is provided a gas insulated switchgear configured to provide an insulating frame inside a tank filled with an insulating gas and to shut off the insulating frame. The gas insulated switchgear according to claim 2 is characterized in that a circuit breaker and a disconnector are provided, and the circuit breaker and the disconnector are directly connected. The opening is closed by a mounting plate, and the insulating frame is mounted inside the mounting plate. The gas-insulated switchgear according to claim 3 is characterized in that the circuit breaker, An operation unit for operating the disconnector is provided outside the mounting plate.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The embodiments of the gas insulated switchgear according to the present invention will be described below.

[0010] As shown in FIG.
1, a tank 22 is provided. This stand 21
Is made of thin sheet metal. And tank 2
2 has a shape in which the lower part on the front side is cut out.

An opening is formed on the front side of the tank 22, and the opening is closed by a mounting plate 23. The inside of the tank 22 is configured to be airtight and filled with an insulating gas. One side of an insulating frame 24 made of a solid insulator is mounted inside the mounting plate 23, and the insulating frame 2
A vacuum circuit breaker 25 as a circuit breaker is mounted inside 4. On the insulating frame 24, a disconnecting switch 26 with a grounding switch as a disconnecting switch is provided. An operation unit 27 for operating the vacuum circuit breaker 25 and an operation unit 28 for operating the disconnector 26 with a grounding switch are provided outside the mounting plate 23.

The bus 29 does not penetrate the tank 22 as in the prior art, but is disposed above the tank 22 without penetrating the tank 22. An opening is formed on the upper surface of the tank 22, and a three-phase insulating spacer 30 that airtightly closes the opening is provided. This three-phase insulating spacer 30
Molds the inner conductor 30a for three phases with a solid insulator,
A ground layer is formed on the surface of the solid insulator by painting and grounding. The upper end of this internal conductor 30a is connected to the bus 29, and the lower part is connected to the disconnecting switch 26 with a ground switch.

In the lower part of the tank 22, there are provided three-phase bushings CT31 of a composite type in which a current transformer (CT) is embedded in a bushing which is a solid insulator. This bushing C
T31 is hermetically attached to the opening of the tank 22 from the inside via an O-ring (not shown). A cable head 32 is attached to the bushing CT31 from the front side of the gas insulated switchgear. The cable head 32 is made of a DIN standard cable terminal material, and a ground layer is formed on the surface. The vacuum circuit breaker 25 and the bushing CT 31 are connected via a conductor 33, and a cable 34 is connected to the cable head 32.

Here, the vacuum circuit breaker 25 and the disconnecting switch 26 with a ground switch are configured as one unit, and are attached to the tank 22 after assembly. FIG. 2 shows the configuration of this unit. The disconnecting switch 26 with a grounding switch is constituted by three-phase switches, and these switches are provided with three-phase insulating spacers 30.
The terminal 26a is connected to the internal conductor 30a, the ground terminal 26b is grounded, and the movable blade 26c is connected to the vacuum circuit breaker 25 and is rotatable. A rotation shaft 26d is rotatably supported on the upper surface of the insulating frame 24, and the rotation shaft 26d is connected to the operation unit 28 in an interlocked manner. The movable blade 26c for three phases is connected to the lever 26.
e, and are interlockingly connected to a rotation shaft 26d via a rod 26f.

The connection between the movable blade 26c and the vacuum circuit breaker 25 is indicated by a straight line (a) in FIG.
Are converted by 90 ° as shown by a straight line (b). Therefore, connection conductors 26g and 26h, connection conductor 26i, and connection conductors 26j and 26k are provided.

Next, the operation of the gas insulated switchgear will be described. When assembling the gas insulated switchgear, as shown in FIG. 2, the insulating frame 24, the vacuum circuit breaker 25, the disconnector 26 with the earthing switch, and the operation units 27 and 28 are mounted on the mounting plate 23 and then mounted. The plate 23 is attached to the tank 22.

The connecting conductors 26g to 26k have changed the direction in which the disconnecting switches 26 with the earthing switch are arranged from the direction of the straight line (b), which is the direction in which the vacuum circuit breakers 25 are arranged, to the direction of the straight line (a). Terminal 2 in disconnector 26 with switch
6a can be directly connected to the internal conductor 30a of the three-phase insulating spacer 30.

In the present embodiment, a disconnecting switch having a grounding switch is used. However, a disconnecting switch having no grounding switch may be used.

[0019]

As can be seen from the above description, claim 1
According to the gas insulated switchgears according to the first to third aspects, the circuit breaker and the disconnector are attached to the insulating frame and integrated, so that the size of the tank and the size of the gas insulated switchgear can be reduced, and the connection conductor and The number of components such as fixing components is reduced.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing an embodiment of a gas insulated switchgear according to the present invention.

FIGS. 2A and 2B relate to a main part of an embodiment of a gas insulated switchgear according to the present invention, wherein FIG. 2A is a front view, FIG. .

FIG. 3 is a configuration diagram of a conventional gas insulated switchgear.

[Explanation of symbols]

 Reference Signs List 22 tank 23 mounting plate 24 insulating frame 25 vacuum circuit breaker 26 disconnector with ground switch 27, 28

Continuing from the front page (72) Inventor Masayuki Hirose 2-1-17 Osaki, Shinagawa-ku, Tokyo, Japan Inside Meidensha Corporation (72) Inventor Kenji Tsuji 2-1-1, Osaki, Shinagawa-ku, Tokyo Inside Meidensha Corporation F term (reference) 5G017 AA23 AA24 JJ01

Claims (3)

[Claims] 1. A gas characterized in that an insulating frame is provided inside a tank filled with insulating gas, a circuit breaker and a disconnector are provided on the insulating frame, and the circuit breaker and the disconnector are directly connected. Insulated switchgear. 2. The gas insulated switchgear according to claim 1, wherein an opening is formed in the tank, the opening is closed by a mounting plate, and the insulating frame is mounted inside the mounting plate. 3. The gas insulated switchgear according to claim 2, wherein an operation unit for operating the circuit breaker and the disconnector is provided outside the mounting plate.