JPH1075512A - Gas insulated switchgear - Google Patents

Abstract

(57) [Problem] To provide a gas insulated circuit breaker capable of shortening the length of a main bus and securing a space around the circuit breaker. A power line connected to a power line, a power line unit connected to the power line unit, a main bus connected to the power line unit, a transformer unit connected to the main bus, and a transformer unit And a connecting part with the drawing part of the transmission line unit and a connection part between the transmission line unit and the main bus were connected by an annular pipe. [Effect] In order to maintain the required insulation distance in the air, the length of the main bus can be reduced for the lead-out portion of the transmission line and the lead-out portion of the transformer arranged with the insulation distance kept.

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 gas insulated switchgear suitable for reducing a site area and securing a space for inspection and maintenance.

[0002]

2. Description of the Related Art A conventional gas insulated switchgear includes a two-line power receiving unit and a single instrument transformer (hereinafter, referred to as a "transformer") for measuring supply power.
This is a type provided with two transformers that receive measured power supply, and is generally used in a so-called two-line power receiving, 1PCT, two-bank type power receiving and transforming system.

[0003] Japanese Patent Application Laid-Open No. S59-5959 discloses a method for reducing the installation area of this gas insulated switchgear.
103507, JP-A-61-13920, JP-A-5-5652
There is one described in No. 0 publication.

[0004] The gas insulated switchgear has excellent insulation properties as compared with the aerial insulator because the current-carrying conductor is disposed in the grounding tank filled with the insulating gas, and can be remarkably reduced in size. However, since the bushing for power transmission is connected to a transmission line in the air, a separation distance equivalent to that of a conventional air insulation device is required.

Normally, the gas insulated switchgear connects the main equipment of each unit, for example, a circuit breaker, a disconnecting switch, etc., from the main bus, and provides an extra bus for connection to the bushing. In other words, since each unit is drawn out in a direction perpendicular to the axial direction of the main bus, it is necessary to secure space around the breaker for maintenance of the breaker and response to accidents. Somewhat large.

[0006]

SUMMARY OF THE INVENTION The above-mentioned JP-A-59-103507 is disclosed.
In the prior art disclosed in Japanese Patent Application Laid-Open No. 61-13920 and Japanese Patent Application Laid-Open No. 5-56520, as described above, the main equipment of each unit is connected from the main bus and connected to the bushing. Because the extra bus is provided and connected,
The bus length was long, and it was difficult to reduce the cost. To reduce the cost, it is difficult to reduce the bus length because it is difficult to reduce the size of the main components of each device because the size of the components is determined by the insulation performance and the current-carrying performance. It is necessary to reduce the dimensions. However, the inspection and maintenance of the gas insulated switchgear must be ensured, so that the conventional configuration has a limitation in reducing the dimension between units.

An object of the present invention is to provide a gas insulated circuit breaker in which the length of the main bus can be reduced and a space around the circuit breaker is secured.

[0008]

In order to achieve the above object, a gas insulated switchgear of the present invention comprises a drawer connected to a power line, a power line unit connected to the drawer, and a power transmission unit. A gas-insulated switchgear comprising a main bus connected to an electric wire unit, a transformer unit connected to the main bus, and a drawer connected to the transformer unit and connected to the transformer. The connection part of the transmission line unit with the lead-out part and the connection part of the transmission line unit with the main bus are connected by an annular pipe.

[0009] Also, a lead portion connected to the power line, a power line unit connected to the power line unit, a main bus connected to the power line unit, and a transformer unit connected to the main bus are provided. A gas-insulated switchgear provided with a drawer connected to the transformer unit and connected to the transformer, wherein a connection between the transformer unit and a drawer and a connection between the transformer unit and the main bus are provided. Are connected by an annular pipe.

[0010] In the first aspect of the present invention, the connecting part of the transformer unit to the lead-out part and the connecting part of the transformer unit to the main bus are connected by an annular pipe. or,
A transmission line unit in which four or more transmission line units are installed, and a connection portion between the transmission line unit and the main bus connected by the annular pipe is disposed at both ends of the main bus. It is provided in.

Further, the transmission line unit disposed on both ends of the main bus and another transmission line unit are disposed adjacent to each other.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. 1 is a plan view of the gas insulated switchgear of this embodiment, FIG. 2 is a single-line diagram of the gas insulated device shown in FIG. 1, and FIGS. 3 and 4 are side views of the transmission line unit of the gas insulated device shown in FIG. 5 and FIG. 5 are side views of a transformer unit of the gas insulating device shown in FIG. 1, and FIG. 6 is a plan view of a gas insulated switchgear which is a modification of the embodiment shown in FIG.

As shown in FIG. 1 and FIG. 2, the gas insulated switchgear of this embodiment is a case where it is applied to an all three-phase type having a configuration of a double bus, four transmission lines, and four transformers. In the case of the double bus system, the main bus 1 and the main bus 2 are arranged in parallel, and the transmission line units 3, 4, 5, and 6 are disposed on the transmission lines of the main buses 1 and 2, respectively. Has a transformer unit 9.1
0, 11, and 12 are arranged. In this embodiment, FIG.
The transformer unit 9 is located at the left end of the main buses 1 and 2, the transmission line unit 6 is located at the right end, and the transformer unit 1 is located at the center.
0, the transmission line units 3 and 4 between the transformer units 9 and 10, the transmission line unit 6 and the transformer unit 1
0, the transformer unit 11 and the transmission line unit 5 are arranged. The transmission line units 4 and 5 and the transformer unit 10 are drawn straight out in a direction orthogonal to the main buses 1 and 2, and the transmission line units 3 and 6
In order to maintain a required insulation distance in the air of the transmission line, the transmission line is configured to spread in a direction orthogonal to the main buses 1 and 2. The transformer units 9 and 11 are configured to extend outward in a direction orthogonal to the main buses 1 and 2 in order to maintain a necessary distance between the transformers.

Here, a part of an annular pipe is applied to a connection portion of the transmission line units 3 and 6 and the transformer units 9 and 11 with the main bus 1 shown as a portion A in FIG. On the other hand, FIG.
A part of the annular pipe is also applied to the connection between the transmission line units 3 and 6 and the transmission line indicated by B, and the connection between the transformer units 9 and 11 and the connection between the transformers is performed. I have. A ring-shaped conductor (not shown) is insulated and supported inside these ring-shaped tubes. By providing the annular pipe indicated by the part A and the annular pipe indicated by the part B, the main bus 1,
It is connected to the connection part with the transmission line installed in the direction parallel to 2 and the drawer part which is the connection part with the transformer.

As shown in FIG. 3, the transmission line units 3 and 6 mainly include a horizontal disconnector 8 provided with a disconnection portion provided on the transmission line side in a horizontal direction, and a transformer of the horizontal disconnector 8. A vertical circuit breaker 7 in which a breaking unit is arranged in a vertical direction is connected to the circuit breaker unit side, and a disconnecting switch 8 is connected below the circuit breaker 7. Although not shown in FIG. 3, the disconnector 8 on the transformer unit side is connected to the main buses 1 and 2 installed further below via the disconnector 8. As shown in FIG. 4, the transmission line units 4 and 5 are configured similarly to the transmission line units 3 and 6 shown in FIG. Since the transmission line units 3 and 6 have their axes arranged in a direction inclined with respect to the direction orthogonal to the axes of the main buses 1 and 2,
The connection pipe is formed long, and an annular pipe indicated by a part A is connected to the disconnector 8 on the transmission line side, and an annular pipe indicated by a part B is connected to the disconnector 8 on the transformer side. However, the transmission line units 4 and 5 do not have such a portion. The transformer units 9 and 10 are connected to the lower side of the above-described vertical circuit breaker 7 via disconnectors 8 installed above the main buses 1 and 2 arranged below, respectively. It is connected to the transformer connection by a connecting pipe connected on the side.

With this configuration, in order to maintain the required insulation distance in the air, the main busbars 1 and 2 are also provided to the lead-out portion of the transmission line and the lead-out portion of the transformer arranged with the insulation distance kept.
Can be made shorter. In that case, the lengths of the transmission line units 3 and 6 and the transformer units 9 and 11 can be reduced. Further, a connection portion indicated by A portion, B
By changing the shape of the connecting portion indicated by the portion, it is possible to cope with various arrangements of the drawer portion without making a significant change in the basic unit. Further, the occupied area including the base of the gas insulated switchgear can be reduced.

In the present embodiment, the transmission line units 3 and 6 are used by using an annular pipe indicated by A and an annular pipe indicated by B.
Although the example in which the transformer units 9 and 11 are radially arranged has been described, in consideration of the site and arrangement of the substation and the total cost, for example, when it is necessary to configure the main bus bar to be curved, the main An annular tube can be applied to the busbar. Further, an annular pipe can be applied between the circuit breaker and the disconnector.

FIG. 6 shows a modification of this embodiment.
In the embodiment illustrated in FIG. 1, the case where the transformer unit 11 is installed between the transmission line units 5 and 6 has been described, but in the present embodiment, the transformer unit 11 is located on the right end side of the main buses 1 and 2. , The transmission line unit 6 is disposed between the transmission line unit 5 and the transformer unit 11. In the case of such a configuration, the circuit breakers 7 of the transmission line units 5 and 6 are arranged close to each other. In particular, when drawing out each unit in a direction orthogonal to the axial direction of the main buses 1 and 2,
It is necessary to secure space around the breaker for maintenance of the breaker and response to accidents. Therefore, the inter-unit dimension L1 shown in FIG. 6 needs to be increased to some extent, and the length of the main buses 1 and 2 cannot be reduced.

In this embodiment, since the annular pipe of the part A and the annular pipe of the part B shown in FIG. 1 are applied, the unit-to-unit dimension L1 can be shortened as long as manufacture and assembly are possible. A space around the adjacent blocking portion 7 can be secured.
As described above, according to the present embodiment, the dimension L1 between the units can be reduced, so that the length L2 of the main buses 1 and 2 can be reduced. Particularly in the case of a large substation having a large number of units, the length of the main bus and the site area can be reduced. For this reason, a gas insulated switchgear that can reduce the total cost can be provided.

[0020]

As described above, according to the gas insulated switchgear of the present invention, in order to maintain the required insulation distance in the air,
The length of the main bus can be shortened even for the lead-out portion of the transmission line and the lead-out portion of the transformer arranged with the insulation distance kept. In that case, the length of the transmission line unit and the transformer unit can be reduced.

Further, by changing the shape of the connecting portion indicated by the portion A and the shape of the connecting portion indicated by the portion B, it is possible to cope with various arrangements of the drawer portions without making significant changes in the basic unit. Further, the occupied area including the base of the gas insulated switchgear can be reduced.

[Brief description of the drawings]

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

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

FIG. 3 is a side view of the transmission line unit indicated by reference numerals 3 and 6 in FIG.

FIG. 4 is a side view of the transmission line unit indicated by reference numerals 4 and 5 in FIG.

FIG. 5 is a side view of the transformer unit indicated by reference numerals 9 and 10 in FIG.

FIG. 6 is a plan view of the gas-insulated switchgear of the present embodiment.

[Explanation of symbols]

1, 2, ... main bus, 3, 4, 5, 6 ... transmission line unit, 7
... breaker, 8 ... disconnector, 9, 10, 11 ... transformer unit.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Michio Moriya 1-1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture Inside Kokubu Plant, Hitachi, Ltd. (72) Yoshiaki Seya 1-1, Kokubuncho, Hitachi City, Ibaraki Prefecture No. 1 Inside the Kokubu Plant of Hitachi, Ltd.

Claims (5)

[Claims] 1. A lead portion connected to a power line, a power line unit connected to the lead portion, a main bus connected to the power line unit, and a transformer unit connected to the main bus. What is claimed is: 1. A gas-insulated switchgear having a drawer connected to the transformer unit and connected to the transformer, comprising: a connection part with a drawer part of the transmission line unit and a connection part between a transmission line unit and a main bus. Are connected by an annular pipe. 2. A lead unit connected to a power line, a power line unit connected to the power line unit, a main bus connected to the power line unit, and a transformer unit connected to the main bus. A gas-insulated switchgear provided with a drawer connected to the transformer unit and connected to the transformer, wherein a connection between the transformer unit and a drawer and a connection between the transformer unit and the main bus are provided. Are connected by an annular pipe. 3. The gas insulated switchgear according to claim 1, wherein a connection part of the transformer unit to the lead-out part and a connection part of the transformer unit to the main bus are connected by an annular pipe. 4. The power transmission line unit according to claim 1, wherein four or more transmission line units are installed, and connection portions between the transmission line unit and the main bus connected by the annular pipe are arranged at both ends of the main bus. The gas insulated switchgear according to claim 1, which is provided in a transmission line unit provided. 5. The gas insulated switchgear according to claim 4, wherein a transmission line unit disposed on both ends of the main bus and another transmission line unit are disposed adjacent to each other.