JPH11341627A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the size of a frame and a foundation and to facilitate maintenance inspection, by arranging each of first to third circuit-breakers at an end section of an apparatus, and arranging first and second main bus-bars on the same horizontal surface on the foundation. SOLUTION: Three-phase bumped type first and second main bus-bars BUS1 , BUS2 are arranged in parallel on the same horizontal plane on a foundation. Besides, circuit-breakers CB1 A-CB3 A are set standing at the side of the first main bus-bar BUS1 with their container axes vertical. Next, a first bus-bar side disconnector DSb1 A is connected between the first main bus-bar BUS1 and a first current transformer CT11 A, and a second bus-bar side disconnector DSb2 A is connected between a main bus-bar connecting bus-bar BUS5 A and a current transformer CT32 A respectively. Next, interline disconnectors DS11 A, DS21 A are connected between the first connecting bus-bar BUS3 A and current transformers CT12 A, CT21 A, and interline disconnectors DS22 A, DS32 A are connected between a second connecting bus-bar BUS4 A and current transformers CT22 A, CT31 A respectively. These are all arranged vertically to the first main bus-bar BUS1 , in a horizontal plane parallel to a horizontal plane containing the first main bus-bar BUS1 .

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used in, for example, a substation facility and the like. The present invention relates to a switchgear.

[0002]

2. Description of the Related Art FIG.
FIG. 8 is an explanatory view showing a three-dimensional arrangement of a conventional gas insulated switchgear disclosed in Japanese Patent Laid-Open No. H10-207, and FIG. 8 is a side view showing a portion S in FIG. In the figure, CB1 to CB3 are first to third
Circuit breakers, CHd1 and CHd2 are first and second cable heads, CT11, CT12, CT21, CT2.
2, CT31, CT32 are current transformers, DSb1, DSb2
Is the first and second line disconnectors, DS12 and DS21 are the first and second line disconnectors, BUS1 and BUS2 are the first line disconnectors.
And the second main buses BUS3 and BUS4 are the first and second buses.
Is the connection bus.

[0003] The gas insulated switchgear described above comprises three circuit breakers C between first and second main buses BUS1 and BUS2.
B1 to CB3 are arranged in series, and each circuit breaker CB1 to CB3
It is a system of drawing out two cable heads CHd1 and CHd2 from between them, that is, a 1.5 circuit breaker system,
The apparatus in FIG. 8 is an example using a three-phase batch type device.

[0004] In the method of arranging devices as shown in FIG.
Compared to a method in which three circuit breakers and current transformers and disconnectors connected to them are all arranged in a single row between two parallel main buses at right angles to the main buses, the whole is more compact. Can be put together.

[0005]

However, in the conventional method of arranging a gas-insulated switchgear as shown in FIG.
Circuit breaker CB that has high-speed moving parts and requires the most maintenance
1 to CB3 are disconnectors DS11 and DS22 and connection bus BU
S3 and BUS4 are sandwiched between the main buses BUS1 and BUS2. Therefore, if the circuit breakers CB1 and CB3 fail, it is difficult to remove and repair them.

Further, high voltage and large circuit breakers CB1, CB
3, the position of the main buses BUS1 and BUS2 becomes higher, and the moment due to the thrust and seismic force applied to the expansion joint for preventing thermal expansion and contraction of the main buses BUS1 and BUS2 increases. It is necessary to make these mounts more robust, which increases costs.

Further, a current transformer CT1 as shown in FIG.
Three-phase circuit breaker CB1 to CB3 including CT32
In order to produce a high pressure container for a high voltage of, for example, about 500 kV, a large pressure vessel is required, and it is difficult to produce such as processing an airtight portion. In order to avoid this, it is necessary to use a single-phase circuit breaker or to provide a current transformer separately, which considerably increases the space of the entire equipment.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and can easily remove a circuit breaker, and can reduce a moment applied to a main bus to reduce the main bus. It is an object of the present invention to provide a gas insulated switchgear that can reduce the cost of a bus bar and its mount and can further reduce the space of the entire equipment.

[0009]

In the gas insulated switchgear according to the first aspect of the present invention, the first and second main buses and the container axis, which are provided on the foundation in parallel and horizontally, respectively, are vertical. Single-phase type first to third circuit breakers erected side by side on the first main bus as described above, and a vertical gap is provided on the side surface of the first circuit breaker on the first main bus side. And the third and fourth current transformers connected to the side surface of the second circuit breaker on the side of the first main bus line at an interval above and below. Horizontal plane including fifth and sixth current transformers, second and third current transformers connected to the side face of the first circuit breaker, the third main circuit bus side of the third circuit breaker at an interval up and down. A first connection bus, which is arranged in parallel with the first main bus and connects the first circuit breaker and the second circuit breaker via the second and third current transformers; The in a horizontal plane including the fifth current transformer 1
A second connection bus, a first main bus, and a first connection bus, which are arranged in parallel with the main bus of the second circuit breaker and connect the second circuit breaker and the third circuit breaker via the fourth and fifth current transformers. Between the current transformer and the second
First and second bus-side disconnectors respectively connected between the main bus and the sixth current transformer, and the first main bus in a horizontal plane parallel to a horizontal plane including the first main bus. And between the second current transformer and the first connection bus,
Between the third current transformer and the fourth current transformer and the second current transformer.
, And single-phase type first to fourth disconnectors respectively connected between the second connection bus and the fifth current transformer, and the second connection bus and the third connection bus. A single-phase unit having third and fourth connection buses for external connection, which are respectively drawn out from between the first inter-line disconnector and between the first connection bus and the first inter-line disconnector. And the single-phase units of each phase are arranged side by side along the first and second main buses.

In a gas insulated switchgear according to a second aspect of the present invention, the first bus-side disconnector is erected perpendicularly to the first main bus.

In a gas insulated switchgear according to a third aspect of the present invention, the second bus-side disconnector is arranged perpendicular to the first and second main buses in a horizontal plane including the sixth current transformer. A main bus connection bus extending vertically from the second main bus is connected between the second main bus and the second bus disconnector.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. Embodiment 1 FIG. 1 is an explanatory diagram showing a three-dimensional arrangement of single-phase units of a gas-insulated switchgear according to Embodiment 1 of the present invention. FIG. 2 is a side view showing the single-phase unit of FIG.
FIG. 3 is a plan view showing the single-phase unit of FIG. In addition,
In each drawing, the suffixes A to C of the reference numerals indicate the devices of A to C phases, respectively, and here, the unit of A phase will be mainly described. Similar single-phase units are provided adjacent to the A-phase unit for the B-phase and the C-phase, but are not shown here.

In FIG. 1, BUS1 and BUS2 are first three-phase collective types provided in parallel in the same horizontal plane.
And the second main buses CB1A, CB2A, CB3A are respectively the first main buses BUS1 so that the container axis is vertical.
Are the first to third circuit breakers erected side by side.

CT11A and CT12A are first circuit breakers C
A first and a second current transformer CT2 connected to a side surface of the B1A on the first main bus BUS1 side at an interval above and below;
1A and CT22A are third and fourth current transformers connected to the side surface of the second circuit breaker CB2A on the side of the first main bus BUS1 at an interval vertically, and CT31A and CT22A are third breakers. Fifth and sixth current transformers connected to the side surface of the device CB3A on the side of the first main bus BUS1 at an interval vertically.

BUS3A is the second and third current transformers CT1
2A, the first circuit breaker CB1A and the second
A first connection bus connecting the circuit breaker CB2A of
This first connection bus BUS3A is arranged in parallel with the first main bus BUS1 in a horizontal plane including the second and third current transformers CT12A and CT21A.

BUS4A is the fourth and fifth current transformers CT2
2A, the second circuit breaker CB2A and the third
A second connection bus connecting the circuit breaker CB3A of
The second connection bus BUS4A is arranged parallel to the first main bus BUS1 in a horizontal plane including the fourth and fifth current transformers CT22A and CT31A.

BUS5A is a main bus connection bus connecting and connecting the third circuit breaker CB3A and the second main bus 2A via the sixth current transformer 32A, and this main bus connection bus BUS.
5A is arranged perpendicular to a horizontal plane including first main bus BUS1.

DSb1A is connected to the first main bus BUS1 and the first bus BUS1.
The first bus-side disconnector DSb1A is connected between the current transformer CT11A and the first bus-side disconnector DSb1A.
Are arranged perpendicular to the horizontal plane including the first main bus BUS1. DSb2A is a second bus-side disconnector connected between the main bus connection bus 5A and the sixth current transformer CT32A. The second bus-side disconnector DSb2A
Are arranged perpendicular to the first main bus BUS1 in a horizontal plane parallel to the horizontal plane including the first main bus BUS1.

DS11A is a first inter-line disconnector connected between the second current transformer CT12A and the first connection bus BUS3A, and DS21A is a first connection bus BUS3A.
And a second current transformer CT21A
DS22A is the fourth current transformer CT22A
A third line disconnector DS32A connected between the second connection bus BUS4A and the second connection bus BUS4A.
4A and a fourth current transformer CT31A, and a fourth inter-line disconnector DS.
11A to DS32A are arranged perpendicular to the first main bus BUS1 in a horizontal plane parallel to the horizontal plane including the first main bus BUS1.

The first and second line-to-line disconnectors DS1
1A, a part of DS21A is a first connection bus BUS3A
Container. Further, a part of the third and fourth inter-line disconnectors DS22A and DS31A is a container of the second connection bus BUS4A.

BUS6A is a third connection bus drawn from between the second connection bus BUS4A and the third inter-line disconnector DS22A, and BSG1A is a third connection bus BS.
Connected to G6A and transmission line (not shown)
The first bushing (or cable head) BUS7A is connected to the first connection bus BUS3A and the first inter-line disconnector DS11A, and the fourth connection bus BSG2A is connected to the first bushing (or cable head). Connection bus BUS7A
L and a second bushing (or cable head) connected to a transformer (not shown) or the like.
A1A and LA2A are lightning arresters, respectively.

In such a gas insulated switchgear, since the first to third circuit breakers CB1A to CB3A are all arranged at the end of the device, maintenance and inspection are easy, and the circuit breaker is Even when it becomes necessary to repair CB1A to CB3A, it is easy to disconnect.

The first and second main buses BUS1, B
Because US2 is located on the same horizontal plane on the foundation,
When an expansion joint is used as a measure against thermal expansion and contraction of the main buses BUS1 and BUS2, even if a frame for supporting the main buses BUS1 and BUS2 is extended from the foundation, the main buses BUS1 and BUS2 are not extended.
The length of the arm up to the point where a large thrust due to the gas pressure inside US2 is applied may be short, and the moment applied to main buses BUS1 and BUS2 is small. Therefore, it is possible to reduce the cost by reducing the size of the frame and the foundation.

Furthermore, since single-phase devices are combined, there is no problem in processing due to the increase in size, and according to the above arrangement, even if single-phase devices are used, the space of the entire equipment can be reduced. It is possible.

FIG. 4 is a side view showing a gas insulated switchgear of the double bus and one circuit breaker type using the apparatus of FIG. 1, and FIG. 5 is a plan view showing the apparatus of FIG. In the figure, CBA ~
The CBCs are A-phase or C-phase, which are erected along the side of the first main bus BUS1 such that the container axis is vertical.
It is a phase breaker.

CT1A and CT2A are A-phase breakers CBA
The first and second current transformers CT1B and C1, which are connected to the side surface of the first main bus BUS1 side of the first main bus BUS1 at an interval vertically.
T2B is the third and fourth current transformers connected to the side surface of the B-phase circuit breaker CBB on the side of the first main bus BUS1 at an interval vertically, and CT1C and CT2C are the C-phase circuit breakers CB.
Fifth and sixth current transformers connected to the side surface of the first main bus BUS1 side of C at an interval vertically.

DSb1A, DSb1B and DSb1C are connected to the first main bus BUS1 and the current transformers CT11A, CT1B and C, respectively.
T1C and the first of the A to C phases respectively connected to the T1C.
And these first bus-side disconnectors D
Sb1A to Sb1C are arranged perpendicular to the horizontal plane including first main bus BUS1.

DSb2A, DSb2B, DSb2C are A-C phase second bus-side disconnectors connected to the second main bus BUS2, respectively, and these second bus-side disconnectors DSb2A-C, It is arranged perpendicular to a horizontal plane including first main bus BUS1. BUS5A, BU
S5B and BUS5C are first connection buses of A to C phases for connecting the first and second bus-side disconnectors, and these first connection buses BUS5A to 5C are the first main bus BUS.
The first main bus BUS in a horizontal plane parallel to the horizontal plane containing
1 and are arranged vertically.

BSG1A, BSG1B and BSG1C are A
~ C phase bushing (or cable head), BUS6
A, BUS6B, BUS6C are bushing BSG1A ~
1C and the second connection buses of the A to C phases connecting between the circuit breakers CBA to CBC, and these second connection buses BU
S6A to 6C are arranged perpendicular to the first main bus BUS1 in a horizontal plane parallel to the horizontal plane including the first main bus BUS1. DS1A, DS1B, DS1C are CT2A,
CT2B, CT2C and second connection bus BUS6A to 6C
A to C phase line disconnectors connected between
1A, LA1B and LA1C are lightning arresters of A to C phases.

As described above, the bus-side disconnectors DSb1A-1
Add connection flange to C, and connect bus BUS5A-5C
Other than shortening, the 1.5-circuit breaker type device and the base shown in FIG.
4A becomes unnecessary) 1 Breaker type equipment can be configured.

Embodiment 2 In the first embodiment, 3
Although the phase-group-type main buses BUS1 and BUS2 are shown, for example, as shown in FIG.
A single-phase type using independent containers for the A to 1C and the second main buses BUS2A to 2C may be used, and the installation area is slightly larger than in the case of the three-phase batch type. A similar effect is achieved.

[0032]

As described above, in the gas insulated switchgear according to the first aspect of the present invention, since the first to third circuit breakers are all disposed at the ends of the device, maintenance and inspection are easy. Yes, it is easy to disconnect if the circuit breaker needs to be repaired due to an accident. In addition, since the first and second main buses are arranged on the same horizontal plane on the foundation, when using an expansion joint as a measure against thermal expansion and contraction of the main bus, the frame for supporting the main bus is extended from the foundation. However, the length of the arm up to the point where a large thrust due to the gas pressure inside the main bus is applied may be short, and the moment applied to the main bus is small. Therefore, it is possible to reduce the cost by reducing the size of the frame and the foundation. Furthermore, since single-phase devices are combined, there is no problem in processing due to the increase in size, and the space of the entire equipment can be reduced. Furthermore, the equipment of the one-breaker system can be configured by using the 1.5-breaker-system equipment and the base almost as they are.

In the gas insulated switchgear according to the second aspect of the present invention, the first bus-side disconnector is erected perpendicularly to the first main bus, so that the space of the entire equipment can be further reduced. .

According to a third aspect of the present invention, in the gas insulated switchgear, the second bus-side disconnector is connected to the first bus line in the horizontal plane including the sixth current transformer.
And the second main bus and the second main bus
Since the main bus connecting bus extending perpendicularly from the second main bus is connected between the main bus disconnecting switch and the second bus disconnecting device, the same as the inter-line disconnecting switch can be used as the second bus disconnecting device. Cost can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing a three-dimensional arrangement of a single-phase unit of a gas-insulated switchgear according to Embodiment 1 of the present invention;

FIG. 2 is a side view showing the single-phase unit of FIG.

FIG. 3 is a plan view showing the single-phase unit of FIG.

FIG. 4 is a side view showing a gas insulated switchgear of a double bus and one circuit breaker type using the apparatus of FIG. 1;

5 is a plan view showing the device of FIG.

FIG. 6 is a side view showing a single-phase unit of the gas-insulated switchgear according to Embodiment 2 of the present invention.

FIG. 7 is an explanatory diagram showing a three-dimensional arrangement of a conventional gas insulated switchgear.

FIG. 8 is a side view showing an S part in FIG. 7;

[Explanation of symbols]

BUS1 first main bus, BUS2 second main bus, C
B1A first circuit breaker, CB2A second circuit breaker, CB
3A Third circuit breaker, CT11A First current transformer, CT
12A second current transformer, CT21A third current transformer, C
T22A fourth current transformer, CT31A fifth current transformer,
CB32A sixth current transformer, BUS3A first connection bus, BUS4A second connection bus, BUS5A main bus connection bus, DSb1A first bus side disconnector, DSb2
A second bus-side disconnector, DS11A first inter-line disconnector, DS21A second inter-line disconnector, DS22A
Third inter-line disconnector, DS32A Fourth inter-line disconnector, BUS6A Third connection bus, BUS7A Fourth connection bus.

Claims (3)

[Claims] 1. A first and a second main bus, which are provided on a foundation in parallel and horizontally to each other, and are erected side by side with the first main bus so that a container axis becomes vertical. 1st to 3rd breakers of the single phase type, 1st and 2nd current transformers connected to the side surface of the first circuit breaker on the side of the first main bus line at intervals up and down. Third and fourth current transformers connected to the side surface of the second circuit breaker on the side of the first main bus at an interval vertically, and the first circuit breaker of the third circuit breaker Fifth and sixth current transformers connected to the side of the main bus side at intervals above and below the first main bus in a horizontal plane including the second and third current transformers A first connection bus arranged in parallel to connect the first circuit breaker and the second circuit breaker via the second and third current transformers; And the third circuit breaker and the second circuit breaker are disposed in parallel with the first main bus in a horizontal plane including the current transformer and a fifth current transformer, via the fourth and fifth current transformers. Connected between the first main bus and the first current transformer, and between the second main bus and the sixth current transformer, respectively. A first and a second bus-side disconnector, which are respectively arranged perpendicularly to the first main bus in a horizontal plane parallel to a horizontal plane including the first main bus, and Between the first connection bus, between the first connection bus and the third current transformer, between the fourth current transformer and the second connection bus, and between the second connection bus and the second connection bus. Single-phase first to fourth disconnectors respectively connected between the connection bus and the fifth current transformer, and the second connection bus and the third inter-line disconnector , And a single-phase unit having third and fourth connection buses for external connection extending from the first connection bus and between the first inter-line disconnector, respectively. Wherein the single-phase units are arranged side by side along the first and second main buses. 2. The first bus-side disconnector is provided upright with respect to the first main bus.
The gas-insulated switchgear according to claim. 3. A second bus-side disconnector is disposed perpendicular to the first and second main buses in a horizontal plane including a sixth current transformer, and the second main bus and the second main bus are connected to each other. The gas insulated switchgear according to claim 1, wherein a main bus connecting bus extending vertically from the second main bus is connected to the bus-side disconnector. 4.