JPH10257624A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas-insulated switchgear, with which a circuit line length can be reduced, a useless space can be eliminated for efficient use of installation space, and more compact installation can be achieved. SOLUTION: Branches 12 extended in a direction perpendicular to a circuit line axis, i.e., a direction in parallel with main bus bars 101a and 101b, are provided on circuit lines 102. Connection bus bars are connected to the branches 12. The connection bus bars are provided so as to be vertical with respect to an installation surface. Arrestors 7 are attached to the lower ends of the connection bus bars and 3-phase instrument transformers 6a are attached to the upper ends of the connection bus bars.

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, and more particularly, to a device having a line circuit with an improved arrangement of equipment.

[0002]

2. Description of the Related Art Conventionally, there has been known a gas insulated switchgear in which a high-voltage conductor is insulated with SF6 gas or the like and housed in a pressure vessel. This gas insulated switchgear has advantages that it can be easily miniaturized, reduced in size and simplified, and that it is excellent in safety and maintenance. The gas insulated switchgear having these advantages can address recent emphasis such as reduction of the construction site of power plants and substations and environmental harmony with the surroundings. Therefore, the demand for the gas insulated switchgear has been increasing, and the gas insulated switchgear has been applied to most switchgears. Along with this, the gas-insulated switchgear is expected to make full use of the above advantages, such as further downsizing.

Here, a conventional example of a gas insulated switchgear will be specifically described with reference to FIGS. This gas insulated switchgear employs two sets of three-phase bus systems. FIG. 7 is a single-line diagram of the gas insulated switchgear, and FIG.
9 is a plan view showing the device arrangement based on the single-line diagram of FIG. 8, FIG. 9 is a side view taken along the line AA of FIG. 8, FIG. 10 is a side view taken along the line BB of FIG. FIG. 12 is a side view as viewed in the direction of arrow C. FIG.
It is a DD arrow side view.

The gas insulated switchgear has two main buses 101.
a and 101b are arranged in parallel and horizontally with respect to the installation surface. Further, the circuit breaker 1 is arranged in the gas insulated switchgear so that the operation axis is perpendicular to the installation surface. The circuit breaker 1 has an upper connection port and a lower connection port.
Further, a bus dividing circuit 104 is connected between the main buses 101a and 101b. In addition, each main bus 101a, 1
The line line 102, the bank line 103, and the bus PT circuits 105a and 105b are connected to 01b. The line line 102, the bank line 103, the bus PT circuits 105a and 105b, and the bus division circuit 104 are all
The main buses 101a and 101b are arranged at right angles to the axis.

[Line Line] Next, the configuration of the line line 102 will be described with reference to FIG. The track line 102 is
Main buses 101a, 101b are connected to the upper connection port of circuit breaker 1.
Are connected at right angles to the axis and horizontal to the installation surface. The line circuit 102 includes a current transformer 5b, a ground switch 4
b, track-side disconnector 3, ground switch 4c, instrument transformer 6
a and the lightning arrester 7 are connected in order.

The grounding switch 4b, the line-side disconnector 3, and the grounding switch 4c are provided in the same container. In this container, a connection bus 1 is provided on a side surface (the right side surface in FIG. 9) opposite to the side surface to which the current transformer 5b is connected.
0 is set. The connection bus 10 is formed with two downwardly extending branch portions, and an instrument transformer 6a and a lightning arrester 7 are vertically installed at each branch portion. Further, a cable connection portion 8 is provided at an end of the connection bus 10.

On the lower connection port side of the circuit breaker 1 to which the line circuit 102 is connected, main buses 101a, 1b are connected via bus disconnectors 2a, 2b, a ground switch 4a, and a current transformer 5a.
01b is connected. The disconnecting switch 2a and the grounding switch 4a are provided in the same container.

[Bank Line] The bank line 103 is shown in FIG.
As shown in FIG. 0, the bus disconnectors 2a, 2b, the earthing switch 4a, the current transformer 5a,
The circuit breaker 1, the current transformer 5b, the grounding switch 4b, and the cable connection unit 8 are sequentially connected. The bank line 103 is different from the line line 102 in that the instrument transformer 6a and the surge arrester 7 are omitted. Therefore, the distance from the grounding switch 4b to the cable connection unit 8 is shorter than that of the line 102.

[Bus Division Circuit] The bus division circuit 104
This is a circuit for connecting the main bus 101a and the main bus 101b. The main bus 101a is connected to a bus disconnector 2a, a ground switch 4a, and a current transformer 5a.
1b includes a bus-side disconnector 2b, a grounding switch 4b, and a current transformer 5b.
Is connected. The current transformer 5a is connected to the upper connection port of the circuit breaker 1, and the current transformer 5b is connected to the lower connection port of the circuit breaker 1, thereby forming a circuit (see FIG. 11).

[Bus PT Circuit] As shown in FIG. 12, a bus PT circuit 105a is constructed by connecting a ground switch 4a and an instrument transformer 6c to a main bus 101a. The bus PT circuit 105b is configured by connecting the ground switch 4a and the instrument transformer 6b to the main bus 101b.

[0011]

In the gas insulated switchgear having a plurality of types of lines or circuits as described above, the length of the line or circuit differs because the equipment connected to each line or circuit is different. In particular, the track line 102 is connected between the circuit breaker 1 and the cable connection section 8 by the track-side disconnector 3 and the grounding switch 4.
In addition to c, many devices such as the lightning arrester 7 and the instrument transformer 6a are connected, so that they are longer than other lines and circuits. In such a gas insulated switchgear including the line line 102, not only the configuration becomes large, but also the length of the line line 102 and the length of other lines and circuits are different. I was invited.

The present invention has been proposed in order to solve the problems of the prior art, and reduces the line length of the line and eliminates useless space to effectively use the installation space. The main object of the present invention is to provide a gas insulated switchgear which is further downsized.

Another object of the present invention is to provide a gas insulated switchgear which shortens a line circuit including a three-phase or single-phase instrument transformer.

[0014]

In order to achieve the above-mentioned object, according to the first aspect of the present invention, the main bus is arranged horizontally with respect to the installation surface, and the circuit breaker is arranged with the operation axis perpendicular to the installation surface. An upper connection port and a lower connection port are formed in the circuit breaker, the main bus is connected to the lower connection port via a bus disconnector, and the upper connection port is perpendicular to the axis of the main bus and installed. In a gas insulated switchgear having a line connected horizontally to a surface and a cable connection portion provided at an end of the line, the line extends in a direction perpendicular to a line axis, that is, in a direction parallel to the main bus. A branch portion is provided, a connection bus is attached to the branch portion, one of an arrester and an instrument transformer is installed at one end of the connection bus, and an arrester and an instrument transformer are installed at the other end of the connection bus. The other of the vessels Characterized in that the location.

According to the first aspect of the present invention, the branch portion extends from the line in a direction perpendicular to the line axis, that is, in a direction parallel to the main bus, and a connection bus provided with a lightning arrester and an instrument transformer is attached thereto. I have. Therefore, as compared with the case where the lightning arrester and the instrument transformer are installed along the line axis of the line, the total length of the line can be reduced by the installation space of these devices. Further, by reducing the line length of the line line, the length of the line line can be made substantially equal to the length of another line or circuit. Therefore, no useless space is generated in the installation location, and the installation space can be effectively used.

According to a second aspect of the present invention, the main bus is disposed horizontally with respect to the installation surface, the circuit breaker is disposed with the operation axis perpendicular to the installation surface, and the upper connection port and the lower connection port are provided in the circuit breaker. The main bus is connected to the lower connection port via a bus disconnector, and a line is connected to the upper connection port at right angles to the axis of the main bus and horizontally to an installation surface, In a gas insulated switchgear having a cable connection portion provided at an end of a line, a branch portion extending in a direction perpendicular to a line axis, that is, in a direction parallel to the main bus line is provided in the line line, and a connection bus line is attached to the branch portion. And a lightning arrester or an instrument transformer is installed on the connection bus.

According to the second aspect of the present invention, the branch portion extends from the line line in a direction perpendicular to the line axis, that is, in a direction parallel to the main bus, and a connection provided with either a lightning arrester or an instrument transformer is provided here. Since the bus is attached, the total length of the line can be reduced by the installation space for the lightning arrester or the instrument transformer. Further, since the line length of the line line is reduced, the length of the line line can be approximately equal to the length of another line or circuit.
As in the first aspect of the present invention, it is possible to suppress the generation of useless space in the installation location.

According to a third aspect of the present invention, in the gas insulated switchgear according to the first or second aspect, the connection bus is arranged perpendicular to an installation surface. According to the third aspect of the present invention, the total length of the line can be reduced even when the instrument transformer has a single phase.

The invention according to claim 4 is the invention according to claim 1, 2 or 3.
The gas-insulated switchgear according to any one of the preceding claims, wherein the instrument transformer is a three-phase transformer. According to the fourth aspect of the invention, the total length of the line including the three-phase instrument transformer can be reduced.

The invention according to claim 5 is the invention according to claim 1, 2 or 3.
The gas insulated switchgear according to any one of the preceding claims, wherein the instrument transformer is a single phase. According to the fifth aspect of the present invention, it is possible to reduce the total length of the line even when the instrument transformer is a single phase.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a gas insulated switchgear according to the present invention will be specifically described below with reference to FIGS. Each of the gas-insulated switchgears according to the following embodiments employs two sets of three-phase bus systems as in the conventional example shown in FIGS. 7 to 12, and has the same equipment and members as the conventional example. Are denoted by the same reference numerals and description thereof is omitted.

(1) First Embodiment A first embodiment will be described with reference to a plan view of FIG. 1 and a side view of FIG. 2 (a side view taken along the line EE in FIG. 1).
The first embodiment includes claims 1, 3 and 4.

As shown in the figure, the line line 102 is provided with a branch portion 12 extending in a direction perpendicular to the line axis, that is, in a direction parallel to the main buses 101a and 101b. This branch 1
A connection bus 11 is attached to 2. Connection bus 11
Are arranged perpendicular to the mounting surface. A lightning arrester 7 is installed at the lower end of the connection bus 11, and a three-phase instrument transformer 6a is installed at the upper end.

In the first embodiment having the above configuration, the following operation and effect can be obtained. That is, the branch portion 12 is extended from the line line 102 in a direction perpendicular to the line axis, that is, in a direction parallel to the main buses 101a and 101b, and the connection bus 11 provided with the lightning arrester 7 and the instrument transformer 6a is attached thereto. As in the conventional connection bus 10 in which the power transformer 7 and the instrument transformer 6a are installed along the line axis of the line 102, a bus that is long in the line axis direction of the line 102 is not required, and the overall length of the line 102 is greatly reduced. Can be reduced.

Further, by reducing the total length of the line 102, it is possible to make the total length equivalent to that of the bank line 103. Therefore, even in a gas insulated switchgear in which lines for different applications are arranged in random order, it is possible to make the lengths of the lines uniform, to eliminate wasteful space, and to effectively use the installation space. This makes it possible to reduce the size of the device.

Incidentally, as a modification of the first embodiment,
As shown in FIG. 3, the lightning arrester 7 and the instrument transformer 6a are interchanged in the installation position, that is, the lightning arrester 7 is installed at the upper end of the connection bus 11, and the instrument transformer 6a is installed at the lower end. There is something. According to such an embodiment, even if the lightning arrester 7 is installed above the line and the instrument transformer 6a is installed below the line, due to circumstances such as installation work and installation wiring work, The same operation and effect as described above can be obtained.

(2) Second Embodiment A second embodiment shown in FIG. 4 is a gas insulated switchgear including claim 5. In the second embodiment, a single-phase instrument transformer 9 is provided at the upper end of the connection bus 12 instead of the three-phase instrument transformer 6a.

According to the second embodiment, the line circuit 102 including the single-phase instrument transformer 9 can be reduced in size, and the installation space can be effectively used to reduce the size of the apparatus. Can be achieved.

(3) Third Embodiment A third embodiment shown in FIG. 5 and FIG. 6 corresponds to claim 3, in which either the lightning arrester 7 or the instrument transformer 6a is connected to the line 102. One is the installed gas insulated switchgear. That is, in the embodiment of FIG.
2, a lightning arrester 7 is installed at the lower end, and in the embodiment shown in FIG. 6, an instrument transformer 6a is installed at the lower end of the connection bus 12. The connection bus 12 perpendicular to the installation surface
However, it is similar to the first embodiment in that it is attached to the branch portion 16 extending in a direction perpendicular to the line axis of the line line 102, that is, in a direction parallel to the main buses 101a and 101b.

According to the gas insulated switchgear of the third embodiment having such a configuration, the line line 102 can be reduced to the same length as the bank line 103 as in the first embodiment. Therefore, even when lines for different applications are arranged in random order, the line length of the gas insulated switchgear can be made uniform, the installation space can be effectively used by eliminating wasteful space, and the device can be made more compact. Become.

As a modification of the third embodiment,
The lightning arrester 7 or the instrument transformer 6 a may be provided at the upper end of the connection bus 12. According to such an embodiment, even when the lightning arrester 7 or the instrument transformer 6a is installed on the upper part of the line, due to circumstances such as installation work and installation wiring work, the same operation and effect as described above can be obtained. Obtainable.

(4) Other Embodiments The present invention is not limited to the above-described embodiments, and various other modifications can be made. That is, all of the above embodiments have been described with reference to a three-phase batch type gas insulated switchgear, but the same configuration can be applied to a phase separation type. Further, the connection to the outside is made by the power cable connection, but the connection by the gas insulated bus or the air bushing may be used. Furthermore, the two single bus systems can be configured without being arranged in parallel.

[0033]

As described above, according to the gas insulated switchgear of the present invention, the branch portion extends from the line line in the direction perpendicular to the line axis, that is, in the direction parallel to the main bus, and the lightning arrester or the transformer for the instrument is provided here. A simple configuration, such as attaching a connection bus with a switch or both, can reduce the total length of the line circuit, and even if the lines for different applications are arranged in random order, the line length of the gas insulated switchgear can be made uniform. As a result, it is possible to contribute to the effective use of the installation space by eliminating wasteful space, thereby making it possible to reduce the size of the apparatus.

[Brief description of the drawings]

FIG. 1 is a plan view of a gas-insulated switchgear according to a first embodiment of the present invention.

FIG. 2 is a side view of the line EE in FIG.

FIG. 3 is a side view showing a modification of the first embodiment (a side view of a track line).

FIG. 4 is a side view of a track line according to a second embodiment of the present invention.

FIG. 5 is a side view of a line circuit having only a lightning arrester according to a third embodiment of the present invention.

FIG. 6 is a side view of a line circuit having only an instrument transformer according to a third embodiment of the present invention.

FIG. 7 is a single-line diagram of a general gas-insulated switchgear.

FIG. 8 is a plan view of the conventional gas-insulated switchgear based on FIG. 7;

FIG. 9 is a side view of the line AA in FIG. 8 (side view of a track line).

FIG. 10 is a side view of the bank line in FIG.

FIG. 11 is a side view of a section taken along line CC of FIG. 8 (a side view of a bus segmenting circuit);

FIG. 12 is a side view taken along the line DD in FIG. 8 (side view of the bus PT circuit);

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 2a, 2b ... Bus-side disconnector 3 ... Line-side disconnector 4a, 4b, 4c ... Grounding switch 5 ... Current transformer 6a, 6b, 6c ... Instrument transformer (for three phase) 7 ... Lightning arrester 8 Cable connecting device 9 Instrument transformer (for single-phase) 10, 11 Connection bus 12 Branch portion 101a, 101b Main bus 102 Line line 103 Bank line 104 105a, 105b Bus PT circuit

Claims (5)

[Claims] 1. A main bus bar is disposed horizontally with respect to an installation surface,
The circuit breaker is arranged with the operation axis perpendicular to the installation surface, an upper connection port and a lower connection port are formed in the circuit breaker, and the main bus is connected to the lower connection port via a bus disconnector, In a gas insulated switchgear, a line circuit is connected to an upper connection port at a right angle to the axis of the main bus line and horizontally to an installation surface, and a cable connection portion is provided at an end of the line circuit. A branch portion extending in a direction perpendicular to the line axis, that is, in a direction parallel to the main bus is provided, a connection bus is attached to the branch, and one of a lightning arrester and an instrument transformer is installed at one end of the connection bus. A gas-insulated switchgear, wherein the other of the lightning arrester and the instrument transformer is installed at the other end of the connection bus. 2. The main bus bar is disposed horizontally with respect to the installation surface,
The circuit breaker is arranged with the operation axis perpendicular to the installation surface, an upper connection port and a lower connection port are formed in the circuit breaker, and the main bus is connected to the lower connection port via a bus disconnector, In a gas insulated switchgear, a line circuit is connected to an upper connection port at a right angle to the axis of the main bus line and horizontally to an installation surface, and a cable connection portion is provided at an end of the line circuit. A gas, comprising: a branch portion extending in a direction perpendicular to a line axis, that is, in a direction parallel to the main bus, a connection bus being attached to the branch, and a lightning arrester or an instrument transformer installed in the connection bus. Insulated switchgear. 3. The gas insulated switchgear according to claim 1, wherein the connection bus is arranged perpendicular to an installation surface. 4. The gas insulated switchgear according to claim 1, wherein the instrument transformer is three-phase. 5. The gas insulated switchgear according to claim 1, wherein the instrument transformer is a single phase.