JP2000125426A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent an area of installation from being increased due to addition of a unit, by placing the case of an additional unit added to a standard unit configuration on the case of the unit of standard configuration. SOLUTION: In the gas-insulated switchgear, a current transformer unit case 40 is placed on an breaker unit 20, and these units 40 and 20 are virtually one case. Conductors coming out of bus unit cases 1A and 1B are supported on an insulating spacer, enter the breaker unit case 20, run along the conductors shown by the upward arrows, go to the upper part of the interior of the current transformer unit case 40, run along the conductors, shown by the downward arrows, which penetrate the coils of an instrument current transformer 41, and passes a breaker 22. If a current transformer unit is added, the area of installation with the current transformer unit added is equalized to that of a gas-insulated switchgear of standard configuration by placing the current transformer unit case 40 on the breaker unit case 20, as mentioned above. As a result, current transformers can be added even if only a small indoor area is available to installation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is configured such that a high-pressure insulating gas called SF6 is sealed in a sealed container and various electric devices such as a circuit breaker and a switch are housed therein. The present invention relates to a gas insulated switchgear.

[0002]

2. Description of the Related Art FIG. 2 is a single-line diagram of a gas insulated switchgear having a basic configuration. In this figure, the gas insulated switchgear constitutes a connection portion with a branch line 9 branched from two buses 11A and 11B, and one line represents a three-phase electric wire.

A single line passes through circuit breakers 22 through disconnectors 12A and 12B provided by branching from buses 11A and 11B, respectively, and branches via two current transformers 24 for instruments and a disconnector 31. 9 is connected. Grounding switches 23A and 23B are provided on both sides of the circuit breaker 22. Also,
On the branch line 9 side of the disconnector 31, a disconnector 32 as a ground switch, a lightning arrester 33, and an instrument transformer 34 are respectively provided in parallel. The equipment constituting these gas insulated switchgears is divided into units as described later, and is housed in a container for each unit.

FIG. 3 is an elevational view including a partial cross-sectional view of a conventional gas insulated switchgear having the circuit configuration shown in FIG.
The same components as those shown in FIG. 2 are denoted by the same reference numerals.
In FIG. 3, busbar units 1A and 1B house busbars 11A and 11B, respectively. These buses 11
The three conductors constituting A and 11B are configured to be long in a direction perpendicular to the paper surface. The cross-sectional view in the figure is at a position connected to the circuit breaker unit container 2, but the busbar unit containers 1A and 1B themselves have a long cylindrical shape in the vertical direction in the figure.

[0005] The two bus unit containers 1A and 1B are connected to the circuit breaker unit container 2 via insulating spacers 71A and 71B. The insulating spacers 71A and 71B support a conductor penetrating the center thereof and cut off the circuit breaker unit container 2 and the busbar unit containers 1A and 1B so that each container is independently filled with an insulating gas. It has become. Therefore, even if one of the containers is damaged and the insulating gas leaks, it does not spread to other containers.

The circuit breaker unit container 2 and the track unit container 3 have a cylindrical shape whose vertical line on the paper is the axis of symmetry. The reason why both the busbar unit containers 1A and 1B are cylindrical is that high-pressure gas of several atmospheres is sealed therein. The circuit breaker unit 2, the current transformer 24 for the instrument, and the earthing switches 23A and 23B are housed in the circuit breaker unit container 2. The breaker operation box 6 provided below the breaker unit container 2 houses a mechanism for driving a movable portion when the breaker 22 is turned on and off.

A line unit container 3 is disposed on the right side of the circuit breaker unit container 2. In the current transformer unit container 3, two disconnectors 31, 32, a lightning arrester 33, an instrument transformer 34, and a through bushing of an external cable, which is not denoted by a reference numeral 9 in FIG.

Although only one circuit breaker 22 is shown in the figure, in practice two circuit breakers are arranged on the opposite side of the figure so as to be hidden by the circuit breaker 22 in front of the circuit breaker 22. The front is also shown in a cross-sectional view, three of which are shown halfway to the left and the one shown in the cross-sectional view that is hidden just behind. The same applies to other devices such as the through bushing 35 and the lightning arrester 33 of the track unit container 3. Although the distinction between the conductor through which the current flows and other components is not clear in this figure, the outline of the conductor routing structure will be described by describing the flow of the current based on the arrows shown in the figure.

The busbars 11A and 11B enter the circuit breaker unit container 2 through conductors with right arrows supported by insulating spacers 71A and 71B via disconnectors 12A and 12B, respectively. The conductors shown are combined to pass through the circuit breaker 22 marked with a downward arrow, and from the conductor marked with an arrow extending to the right from below, the cross section of the current transformer 24 for the instrument is marked with a cross. The through bushing 35 extends from the conductor with the right arrow supported by the insulating spacer 72 through the conductor with the upward arrow penetrating the upper and lower two coils shown, and the conductor with the downward arrow through the disconnector 31. Through the external cable 9 to the outside of the gas insulated switchgear.

[0010] The current signal measured by the current transformer 24 is not only used to indicate the current of the circuit to the indicating instrument, but also causes an accident such as a short circuit or a ground fault at a load beyond the external cable 9. It is used for various applications such as detection and protection. The configuration of the gas insulated switchgear of FIGS. 2 and 3 is a basic configuration, and a gas insulated switchgear having a configuration in which additional equipment is added depending on a place where the device is installed may be adopted.

FIG. 4 is a single-line diagram of a gas insulated switchgear having a circuit configuration different from that of FIG. 2, and the same circuit elements as those of FIG. FIG. 4 is FIG.
The point different from the above is that an instrument current transformer 41 is additionally provided on the left side of the circuit breaker 22. As described above, since the output signal of the instrument current transformer is used for many purposes, the instrument current transformer 24 alone may not be sufficient as shown in FIG. In such a case, the instrument current transformer 41 may be additionally provided.

FIG. 5 is an elevational view including a partial cross-sectional view of the gas insulated switchgear having the circuit configuration of FIG. 4, and the same components as those of FIG. FIG.
The current transformer unit container 4 is provided between the busbar unit containers 1A and 1B and the circuit breaker unit container 2 shown in FIG. The busbar unit containers 1A and 1B are connected to the left side of the current transformer unit container 4, but the configuration of this portion is the same as that of the circuit breaker unit container 2 in FIG. That is, the two conductors supported by the insulating spacers 71A and 71B enter the current transformer unit container 2. Also,
On the right side, a circuit breaker unit container 2C is connected. The configuration inside the circuit breaker unit container 2C is almost the same as that of the circuit breaker unit container 2 in FIG. One conductor is the insulating spacer 7 of FIG.
It enters the circuit breaker unit container 2 while being supported by the insulating spacer 73 corresponding to 1A. Therefore, the insulating spacer 7 shown in FIG.
The part provided with 1B is covered and not used.

[0013]

As described above, the current transformer unit container 4 is composed of the busbar unit containers 1A and 1B.
And a circuit breaker unit container 2C, which increases the installation area of the gas insulated switchgear. Although there is no problem when there is enough space in the installation place, there is a problem that it is difficult to add a current transformer unit when installed in a narrow place such as indoors. The purpose of the present invention is to solve such problems,
An object of the present invention is to provide a gas-insulated switchgear that does not increase the installation area even when a unit is added.

[0014]

According to the present invention, there is provided a gas-insulated switchgear in which a device constituting a switchgear is divided into a plurality of units and each unit is housed in a container. In the above, by disposing the container of the additional unit added to the standard unit configuration on the container of the standard configuration unit, the installation area of the gas insulated switchgear can be reduced.

A current transformer in which a current transformer unit is housed on a circuit breaker unit container of a gas insulated switchgear including a bus unit, a circuit breaker unit, and a line unit, in which the circuit breaker unit is housed. By arranging unit containers, current transformer units not included in the standard configuration can be added without increasing the installation area.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments. FIG. 1 is an elevational view including a sectional view of a gas-insulated switchgear showing an embodiment of the present invention. The same components as those in FIG. Omit description. The gas insulated switchgear of FIG. 1 has the circuit configuration of FIG. 4, that is, the same circuit configuration as the gas insulated switchgear of FIG. FIG. 1 differs from FIG. 5 in that the current transformer unit container 4D is arranged on the circuit breaker unit container 2D. Therefore, the busbar unit containers 1A, 1
The relationship between B and the circuit breaker unit container 2D is the same as that of FIG. Instead, the current transformer unit container 4D is mounted so as to cover the lid of the circuit breaker unit container 2 of FIG. 3, and these current transformer unit containers 4D and the circuit breaker unit container 2D are substantially One container.

As in FIG. 3, the current flowing through the conductor is indicated by an arrow. The conductors coming out of the busbar unit containers 1A and 1B are supported by the insulating spacers 71A and 71B, enter the breaker unit container 2D, pass through the conductor indicated by the upward arrow, go to the top of the current transformer unit container 4D, and convert the conductor for the instrument. Sink 4
It passes through the circuit breaker 22 through a conductor with a downward arrow passing through one coil. The rest is the same as FIG.

As described above, when the current transformer unit is additionally provided, if the current transformer unit container 4D is provided on the circuit breaker unit container 2D, the gas insulated switchgear of the standard configuration shown in FIG. Since the installation area is the same as the installation area, the installation area is small as in the case of installing indoors, and it is difficult to install the current transformer unit container 4 on the same horizontal plane as the circuit breaker unit 2C as shown in FIG. Even in such a case, it becomes possible to add a current transformer unit.

Further, when an attempt is made to add a current transformer unit to a gas-insulated switchgear having a standard configuration already manufactured, the configuration shown in FIG. Not only changes, but also the position of the external cable 9 changes, which necessitates cable laying work and raises the cost. Such a problem does not occur if the configuration in which the current transformer unit container 4D is placed on the circuit breaker unit container 2D as shown in FIG. 1 is employed.

Further, in the current transformer unit container 4 of FIG. 5, it is necessary to make the container higher than necessary in order to adjust the height dimension to other unit containers, but in the current transformer unit container 4D of FIG. Since there is no such restriction, a container having a small height can be adopted, and there is a factor of cost reduction in that materials can be saved. The insulating spacer 7 shown in FIG.
Cost reduction can be expected because 3 becomes unnecessary.

In the above-described embodiment, the case where a current transformer unit is added is not limited to the current transformer unit as the unit to be added. By arranging them on the container of this unit, the same operation and effect as described above can be expected.

[0022]

As described above, according to the present invention, when a unit such as a current transformer unit is added to a gas insulated switchgear having a standard configuration, the container of the unit to be added is placed on the unit container of the standard configuration. By doing so, the installation area can be made the same as that of the standard configuration. Also, if a standard configuration gas-insulated switchgear is already installed and the existing container for the additional unit is placed on the same horizontal plane as the existing unit, the circuit breaker operation box and basic While many changes are required, such as a change in the stand and cable laying work due to a change in the position of the external cable, the container of the unit to be added using this invention is placed on a ready-made unit. As a result, these changes are eliminated, and units can be added with minimal changes.

[Brief description of the drawings]

FIG. 1 is an elevational view including a partial cross-sectional view of a gas-insulated switchgear showing an embodiment of the present invention.

FIG. 2 is a single-line diagram of a gas-insulated switchgear.

FIG. 3 is an elevation view including a partial cross-sectional view of the conventional gas insulated switchgear of FIG. 2;

4 is a single-line diagram of a gas-insulated switchgear different from FIG. 2;

FIG. 5 is an elevation view including a partial cross-sectional view of the conventional gas insulated switchgear of FIG. 4;

[Explanation of symbols]

1A, 1B ... bus unit container, 2, 2C, 2D ... breaker unit container, 22 ... breaker, 24 ... current transformer for instrument,
3: Track unit container, 4, 4D: Current transformer unit container, 41: Current transformer for instrument

Claims (2)

[Claims] 1. A gas insulated switchgear in which components are divided into a plurality of units and each unit is housed in a container, wherein a container of an additional unit added to a standard unit configuration has a standard configuration unit. A gas insulated switchgear, which is arranged on a container of the above. 2. A transformer in which a current transformer unit is stored on a circuit breaker unit container of a gas insulated switchgear including a bus unit, a circuit breaker unit, and a line unit. The gas insulated switchgear according to claim 1, wherein a flow unit container is arranged.