JP2000253520A - Gas-insulated switch device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the installation space of a gas-insulated switch device, in the gas-insulated switch device which includes a T-type branching bus disposed in a T-type branching portion. SOLUTION: This gas-insulated switch device is related to the one wherein two disconnector-grounded switch devices are disposed in series with each other to connect a branching disconnector with the connective point of the two disconnector-grounded switch devices. This devices characterized in that two disconnector-grounded switch devices (4a, 6a; 4b, 6b) are stored in a first grounded metallic container 1, and a branching disconnector 4c is stored in a second metallic container 2 branched and connected from the metallic container 1.

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 substation facility or the like. The present invention particularly relates to a gas insulated switchgear used for a power receiving facility having a communication line in a two-line power receiving line or a two-line transformer line.

[0002]

2. Description of the Related Art A connecting line portion of a gas insulated switchgear of this type includes two disconnector grounding switches arranged in series,
The circuit configuration is such that the disconnector is branched from the connection point of the two disconnector ground switches. As is well known, a conventional gas insulated switchgear includes a switchgear such as a circuit breaker or a disconnector in a metal container filled with sulfur hexafluoride (SF ₆ ) gas and the like, which is extremely excellent in insulation and arc extinguishing properties. They are housed and combined with buses and the like. This gas insulated switchgear
It can be configured to be significantly smaller than an air-insulated switchgear. In particular, in recent years, due to a remarkable rise in land prices and the like, gas-insulated switchgears that can be downsized have been widely used in power receiving equipment. In addition, when the operation of the equipment cannot be stopped on the demand side, a circuit for connecting the two power receiving lines and the transformer line is provided, so that either the power receiving line or the transformer line is stopped for maintenance and inspection work. In this case, a configuration is also adopted in which power can be supplied to consumers without interruption. FIG. 5 shows a configuration example of such a gas insulated switchgear.

FIG. 5 shows a gas-insulated switchgear 2 applied thereto.
FIG. 1 shows a typical single-line diagram of a power receiving line two-transformer line communication system. In this line facility, an A line and a B line are provided as power receiving lines, and a C line and a D line are provided as transformer lines. The A line is, in order from the power receiving side, a cable head 20a, a disconnector grounding switch 21a,
It has a circuit breaker 22a and a disconnecting switch 23a. Similarly, the B line also includes, in order from the power receiving side, a cable head 20b, a disconnector grounding switch 21b, a circuit breaker 22b, and a disconnector grounding switch 23b. The C line
The disconnector ground switch 27c and the circuit breaker 2 in this order from the A line side.
8c, a ground switch 29c, and a transformer 30c. The D line includes, in order from the B line, a disconnector ground switch 27d, a circuit breaker 28d, a ground switch 29d, and a transformer 30d.

[0006] A measuring unit AC for power trading is interposed between the A line and the C line, and a measuring unit BD for power trading is interposed between the B line and the D line. The measuring unit AC includes, in order from the A line, a disconnector grounding switch 24e, a power transformer voltage transformer 25e, and a disconnector grounding switch 26e. The measurement unit BD includes, in order from the B line, a disconnector grounding switch 24f, a power transformer voltage transformer 25f, and a disconnector grounding switch 26f.

A connection point M between the A line and the measuring unit AC,
A communication circuit AB is connected between the connection point N between the B line and the measurement unit BD, and between a connection point O between the measurement unit AC and the C line and a connection point P between the measurement unit BD and the D line. To
The communication circuit CD is connected. The communication circuit AB includes a disconnector 31ab, a ground switch 32ab, and a disconnector 33a.
b, and the communication circuit CD includes a disconnector 31cd,
It consists of a ground switch 32cd and a disconnecting switch 33cd. By providing such communication circuits AB and CD, it is an advantage that the power supply lines A and B or the transformer lines C and D can almost completely be prevented from being stopped.

[0006] Each of the disconnectors and grounding switches described above is of a three-phase collective type.

Here, the arrangement of the disconnector grounding switch 23a, the disconnector grounding switch 24e and the disconnector 31ab arranged at the connection point M is shown in FIG. 6 showing a main part of a conventional example of a gas insulated switchgear. This will be specifically described with reference to FIG.

As shown in FIG. 6, a three-phase collective disconnector grounding switch 23a belonging to the A line, a three-phase collective disconnector grounding switch 24e belonging to the measuring section AC, and a three-phase collective disconnection switch belonging to the communication circuit AB. The disconnector 31ab is connected via a T-type three-phase collective branch bus 40. The three-phase collective disconnector grounding switch 23a is a disconnector for switching to the A line, the three-phase collective disconnector grounding switch 24e is a disconnector for a power transformer, and a three-phase collective disconnector. 31ab is operated as a disconnecting switch for switching to the connection line AB.

[0009]

The conventional gas insulated switchgear as described above has the following problems.

Since three disconnectors or earthing switches 23a, 24e and 31ab are connected to the T-shaped branch bus 40, the line size in each direction becomes longer, thereby increasing the installation space of the substation equipment. The problem occurred. Furthermore, in recent years, the demand for the gas insulated switchgear tends to increase due to factors such as consideration for the nearby environment and soaring land prices. Therefore, the development of an excellent gas-insulated switchgear for miniaturization has been awaited, for example, the site arrangement can be reduced by devising the arrangement between the devices.

The present invention has been proposed in order to solve the above problems, and a main object of the present invention is to provide a gas insulated switchgear including a T-shaped branch bus arranged in a T-shaped branch. The purpose is to reduce the installation space.

[0012]

In order to achieve the above object, according to the first aspect of the present invention, two disconnector grounding switches are arranged in series, and a branch point is connected to a connection point between the two disconnector grounding switches. In a gas insulated switchgear for connecting a disconnector, both disconnector grounding switches are housed in a grounded first metal container, and a branch disconnector is connected to the first metal container. It is characterized by being stored inside.

According to a second aspect of the present invention, in the gas insulated switchgear according to the first aspect, an insulating spacer for fixing the movable-side conductor of the branch disconnector is provided between the two metal containers. It is characterized by.

According to a third aspect of the present invention, there is provided a gas-insulated switchgear in which two disconnector grounding switches are arranged in series and a branch disconnector is connected to a connection point between the two disconnector grounding switches. The switch and the disconnector are housed in a common grounded metal container.

The invention according to claim 4 is the invention according to claims 1 to 3.
In the gas insulated switchgear according to any one of the above, an operation box for both disconnector grounding switches is arranged above and below the metal container.

The present invention is generally applied to a three-phase circuit, in which case it is configured as a three-phase collective type.
As is well known, the electric circuit may include an AC circuit or a DC circuit having a different number of phases in addition to the three-phase AC circuit. However, the present invention can also be configured for such a non-three-phase AC circuit.

[0017]

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

<Embodiment of the Invention According to Claim 1> An embodiment of the invention according to claim 1 will be described. FIG. 1 shows a gas insulated switchgear of this embodiment. Two disconnector grounding switches arranged in series (FIG. 5: 23a, 24
e), and a three-phase batch disconnector (FIG. 5:
31ab) shows a switchgear of the type branching off.
An airtight structure grounded metal container 1 having insulating spacers 7a and 7b on both sides and a grounded connecting line metal container 2 provided with an insulating spacer 7c are provided. 2 form a T-shaped branch. As shown, the metal container 2 is branched and connected to one side of the metal container 1. A disconnector 4a of A line in metal container 1,
The grounding switch 6a, the movable-side conductor 3a, the disconnector 4b of the measuring unit AC, the grounding switch 6b, the movable-side conductor 3b, and the fixed-side conductor 5a common to both disconnectors are arranged. The fixed-side conductor 5a is fixed at a predetermined position by an insulating tube 8.
Disconnector 4c for connecting line, fixed-side conductor 5a in metal container 2.
And a movable-side conductor 3c and a fixed-side conductor 5b, which are integrated with each other. Each of the above members is arranged for three phases. The metal container 1 is provided with a lid 10 that can be opened and closed for maintenance and inspection of the peripheral parts around the grounding switches 6a and 6b and the disconnectors 4a and 4b, and for the same reason, the disconnector 4c and the peripheral parts thereof. A lid 11 is provided on the metal container 2 for maintenance and inspection. The fixed-side conductor 5a is provided commonly to the disconnectors 4a and 4b, and is connected to the movable-side conductor 3 of the disconnector 4c.
“c” is formed integrally with the fixed-side conductor 5 a and is supported by the insulating tube 8.

The relationship between each disconnector and the earthing switch shown in FIG. 5 can be described. If the movable-side conductor 3a, the disconnector 4a, the fixed-side conductor 5a and the earthing switch 6a are used, the three-phase collective disconnector earthing switch 23a Similarly, the movable conductor 3b, the disconnector 4b, the fixed-side conductor 5a, and the grounding switch 6b constitute a three-phase collective disconnector grounding switch 26e. Further, the movable-side conductor 3c, the disconnector 4c, and Fixed side conductor 5b
Constitutes a three-phase collective disconnector 31ab.

In this embodiment having the above configuration, the three-phase collective disconnector grounding switch and the three-phase collective disconnector are housed in separate grounded metal containers 1 and 2, respectively. Unlike the conventional case, there is no need to connect two disconnector grounding switches and one three-phase collective disconnector with one independent branch bus, and only the portion that does not require an independent branch bus is required. In addition, the installation space as the gas insulated switchgear can be reduced.

<Embodiment of Invention According to Claim 2> An embodiment of the invention according to claim 2 will be described. The gas insulated switchgear of this embodiment is, as shown in FIG.
Between the metal container 2 and the metal container 2,
Is provided with an insulating spacer 9 at a portion where the wire is branched, and the insulating spacer 9 supports the fixed-side conductor 5a of the disconnectors 4a and 4b and the movable-side conductor 3c of the disconnector 4c. Also in this embodiment, the installation space can be reduced equivalent to that of the embodiment of FIG. 1, and the method of fixing the internal conductor of the three-phase collective disconnector grounding switch can be facilitated.

<Embodiment of the Invention According to Claim 3> An embodiment of the invention according to claim 3 will be described. As shown in FIG. 3, the gas insulated switchgear of this embodiment has the same components as those of FIG. 1 housed in a common metal container 14. That is, this embodiment is different from the metal containers 1 and 2 shown in FIG.
Are configured as an integral T-shaped metal container 14.
Also in the present embodiment, the reduction of the installation space equivalent to that of the first embodiment can be achieved. In the figure, a lid 15 is provided on the metal container 14 for inspection and maintenance of the disconnector 4c.

<Embodiment of Invention According to Claim 4> An embodiment of the invention according to claim 4 will be described. FIG. 4 is a plan view showing the gas-insulated switchgear of this embodiment. Here, the same parts as those in FIG. 1 are denoted by the same reference numerals. In this embodiment, an operation box of one of two three-phase collective disconnector grounding switches (corresponding to the disconnector grounding switches 23a and 24e in FIG. 5) (for example, the disconnector grounding switch 23a) is arranged in series. 16 is arranged on the upper part of the metal container 1, and the other three-phase collective disconnector grounding switch (disconnector grounding switch 24e in FIG. 5)
The operation box 17 is disposed below the metal container 1, and the operation box 18 of the three-phase batch disconnector on the branch side (disconnector 31ab in FIG. 5) is disposed above the metal container 2.

In this embodiment, the operation space 16 and 17 of the two three-phase collective disconnectors and earthing switches arranged in series are arranged up and down to reduce the installation space of the operation box as viewed in plan. By aligning the rotation directions of the operations of the upper and lower operation boxes, it is possible to configure the operation boxes with the same structure.

[0025]

As described above, according to the present invention,
The dimensions of both the line direction and the branch line direction of the gas insulated switchgear are reduced, so that the entire device can be downsized, and the installation area and the building volume can be greatly reduced.

[Brief description of the drawings]

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

FIG. 2 is an internal structural view showing a second embodiment of the gas insulated switchgear according to the present invention.

FIG. 3 is an internal structural diagram showing a third embodiment of the gas insulated switchgear according to the present invention.

FIG. 4 is a plan view showing a fourth embodiment of the gas-insulated switchgear according to the present invention.

FIG. 5 is a single-line diagram of a typical substation with two power receiving lines and two transformer lines.

FIG. 6 is a plan view of a main part of a conventional gas insulated switchgear.

[Explanation of symbols]

 1, 2, 14 Metal container 3a, 3b, 3c Movable conductor 4a, 4b, 4c Disconnector 5a, 5b Fixed-side conductor 6a, 6b Grounding switch 7a, 7b, 7c, 9 Insulating spacer 8 Insulating cylinder 10, 11, 15 Lid 16, 17, 18 Operation box

Continuing from the front page (72) Inventor Kazuaki Yasue 2-1 Ukishima-cho, Kawasaki-ku, Kawasaki-shi, Kanagawa Prefecture Inside the Toshiba Hamakawasaki Plant (72) Inventor Eri Tanaka Nakayukicho, Yuki-ku, Kawasaki-shi, Kanagawa 3-27-2 Toshiba Living Service Co., Ltd. (72) Inventor Tomohiro Miyazaki 66-2 Horikawa-cho, Saiwai-ku, Kawasaki-shi, Kanagawa Prefecture F-term within Toshiba Engineering Co., Ltd. 5G017 AA02 AA32 BB02 FF02 JJ01

Claims (4)

[Claims] Claims: 1. An earthing switch having two disconnectors arranged in series,
In a gas insulated switchgear for connecting a branch disconnector to a connection point of a double disconnector grounding switch, the double disconnector grounding switch is housed in a grounded first metal container, and the branching disconnector is provided. The gas insulated switchgear is housed in a second metal container branched and connected to the first metal container. 2. The gas-insulated switchgear according to claim 1, wherein an insulating spacer for fixing a movable-side conductor of a branch disconnector is provided between the two metal containers. Insulated switchgear. 3. The two disconnector grounding switches are arranged in series,
In a gas insulated switchgear for connecting a branch disconnector to a connection point of a double disconnector grounding switch, the double disconnector grounding switch and the disconnector are housed in a common grounded metal container. Gas insulated switchgear. 4. The gas-insulated switchgear according to claim 1, wherein operation boxes for the double-switch grounding switch are arranged above and below the metal container. .