JP2003299216A - Gas-insulated switchgear - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a superior gas-insulated switchgear that is structured in a one-line arrangement space without impairing a function even in a line that cannot interrupt an external connecting line, by composite-arranging a busbar section line and the external connecting line, also making the switchgear compact in size, and contributing to reduction in cost by reducing the number of constituents and the arrangement space. <P>SOLUTION: Disconnecting switches 2a, 2b, grounding switches 3a, 3b, current transformers 4a, 4b, breakers 5a, 5b and current transformers 6a, 6b are connected to terminals of master busbars 1a, 1b, respectively. Grounding terminals of two sets of the breakers 5a, 5b at opposite sides of the master busbars 1a, 1b are connected with each other, and a grounding switch 7 and a cable head 8 for external connection are arranged and connected. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a layout of a gas-insulated switchgear in which a main circuit is housed in a grounded container and an insulating gas is sealed, and more particularly, to an apparatus that constitutes a bus bar section line and an external connection line. The present invention relates to a gas-insulated switchgear arranged in combination.

[0002]

2. Description of the Related Art In recent years, it has become more and more important to make gas insulated switchgears compact in size as the difficulty of land acquisition and interest in environmental harmony increase. Here, a conventional gas-insulated switchgear will be specifically described with reference to the drawings. FIG. 8 shows an example of a single-wire connection diagram of a gas-insulated switchgear having a single-bus system and having busbar sections. In FIG. 8, two main buses 11a and 11b
Disconnectors 12a, 12b, ground switch 13a,
13b and current transformers 14a and 14b are sequentially connected, and are connected to both sides of the breaker 15. By connecting the devices in this way, a bus section line is formed.

Here, a configuration example of the bus section line will be described with reference to FIGS. 9 and 10. 9 is a plan view of the bus section line, and FIG. 10 is a side view of the same. Main bus 11a,
11b are arranged parallel to the installation surface and parallel to each other. A disconnector 12 is provided above the main buses 11a and 11b.
a, 12b and grounding switches 13a, 13b are arranged, and the current transformer 14 is disposed in the same direction on the side surface (rightward in FIGS. 9 and 10).
a and 14b are respectively connected. Main bus 1
The disconnector 12a, the grounding switch 13a, and the current transformer 14a connected to the 1a side are arranged immediately above the main bus bar 11a. The disconnector 12b, the grounding switch 13b, and the current transformer 14b connected to the main bus 11b side are arranged above these devices. Further, the circuit breaker 15 is arranged such that the operation axis is perpendicular to the installation surface, and the lower side and the upper side of the circuit breaker 15 are connected in the same direction on the side surface (leftward in FIGS. 9 and 10) and connected downward. Port 15α and upper connection port 15β
Has been derived. The lower connection port 15α and the upper connection port 15β are connected to the current transformers 14a and 14b, respectively.

Further, external connection lines, such as an in-house transformer circuit of a power plant and a common transformer circuit for supplying auxiliary power, are connected to the main buses 11a and 11b. If these power supply circuits, etc. are stopped, the power plant, etc. cannot be operated. Therefore, normally two main buses 11a,
It is necessary to separately draw a line from 11b so that electric power can be stably supplied even when one of the main buses 11a and 11b is stopped. Specifically, as shown in FIG. 8, the main buses 11a and 11b are connected to disconnectors 21a and 21b, ground switches 22a and 22b,
The current transformers 23a and 23b, the circuit breakers 24a and 24b, the current transformers 25a and 25b, the grounding switches 26a and 26b, and the cable heads 27a and 27b are sequentially connected, and a power supply circuit and the like are configured thereby.

An example of the structure of such an external connection line will be described with reference to the plan view of FIG. 11 and the side view of FIG. Here, the line connected to the main bus 11a side will be described, but the line connected to the main bus 11b side has the same configuration. That is, the disconnector 21a and the ground switch 22a are arranged above the main bus 11a, and the current transformer 23a is connected to the side surface thereof. Also, main bus 11
A circuit breaker 24a is arranged perpendicular to the installation surface on the left side of FIG. The main bus bar 11 is provided at the bottom and top of the breaker 24a.
The lower connection port 24aα and the upper connection port 24 toward the a side
aβ has been derived. Of these, the lower connection port 24aα
Is connected to the current transformer 23a, and the upper connection port 24
A current transformer 25a and a ground switch 26a are connected to aβ. Further, the cable head 2 is connected to the grounding switch 26a.
7a is connected and connected to an external device such as a transformer by a power cable. An external connection line is configured by connecting the devices in this manner.

[0006]

The prior art having the above-mentioned structure has the following problems. That is, since the bus line section line and the external connection line were completely configured separately, each component equipment and arrangement space were required. Further, when the external connection line is a line such as a power supply circuit that cannot be stopped, the external connection line in which a circuit breaker or the like is arranged is arranged independently from each divided main bus. As a result, two or more lines of component equipment and an installation space were required. Moreover, the line that cannot be stopped is usually
It was sufficient to use one line, and it was uneconomical to install two lines. As described above, in the gas-insulated switchgear having the busbar section line and the external connection line, the number of constituent devices used is large, the installation space is increased, and the size of the device is increased and the cost is increased.

The present invention has been proposed in order to solve the above problems, and an object thereof is to provide a system in which an external connection line cannot be stopped by combining a bus section line and an external connection line. It is to provide an excellent gas-insulated switchgear that can be configured with an arrangement space for one line without impairing its function, and can reduce the components and the arrangement space to contribute to downsizing and cost reduction. .

[0008]

In order to achieve the above-mentioned object, the invention of claim 1 has two main buses, and each main bus is provided with a disconnector, a ground switch and a current transformer. And the two circuit breakers are connected to each other,
Further, a cable head for connecting a power cable is arranged and connected between the two circuit breakers. According to the invention of claim 1 having the above configuration, the circuit breaker is connected to the main bus through the disconnector, the grounding switch, and the current transformer.
By connecting the two circuit breakers together and connecting the cable head between the circuit breakers, the busbar section line and the external connection line can be arranged in combination. Moreover, since the circuit breakers are connected to both sides of the external connection line, the external connection line can be connected to either of the two main buses. That is, even if the main bus bar on one side is stopped, it is possible to instantly connect to the other main bus line. Therefore, even if there is only one external connection line for the two main buses, this external connection line can be used as a line that cannot be stopped. In the past, in order to make the external connection line function as a line that cannot be stopped, the external connection line was arranged for each main bus bar, so that component equipment and arrangement space for two lines were required. On the other hand, in the present invention having the above configuration, it is possible to use only one external connection line for the two main buses without impairing the function of the line that cannot be stopped. As a result, the number of devices used can be significantly reduced, which can contribute to a reduction in arrangement space and cost.

According to a second aspect of the present invention, two main buses parallel to the installation surface are arranged in parallel with each other, and a disconnecting switch and a grounding switch are arranged above the main bus. A connection port is led out toward the outside of one main busbar, and a circuit breaker whose operating axis is perpendicular to the installation surface is arranged outside each main busbar, and each disconnector is connected to the disconnector. A lower connection port that faces the mouth and an upper connection port that faces the same horizontal line in the inner direction of the two main buses are formed;
The connection port of the disconnector and the lower connection port of the circuit breaker are connected via a current transformer, the upper connection ports of each circuit breaker are connected by a connection bus bar, and a ground switch is connected to the connection bus bar. It is characterized in that a cable head for connecting a power cable is arranged and connected. The invention of claim 2 relates to the arrangement configuration of the equipment, and in addition to the function and effect of the invention of claim 1, the main bus bar is arranged inside the two circuit breakers. This is effective in reducing the space in the direction orthogonal to the axis.

According to a third aspect of the present invention, two main buses that are parallel to the installation surface are arranged in parallel with each other, and a disconnector and a ground switch are arranged above the main bus, and the disconnector has the above-mentioned 2 A connection port is led out toward the inside of one main busbar, and a circuit breaker whose operating axis is perpendicular to the installation surface is arranged inside each main busbar, and each disconnector is connected to the disconnector. A lower connection port facing the mouth and an upper connection port facing the same horizontal line in the opposite direction to the lower connection port are formed, and the connection port of the disconnector and the lower connection port of the circuit breaker are Connected via a current transformer, the upper connection ports of each of the circuit breakers were connected by a connecting bus, and a grounding switch was arranged on the connecting bus and a cable head for connecting a power cable was arranged and connected. It is characterized by The invention of claim 3 is also related to the arrangement of equipment, and the positional relationship between the main busbar and the circuit breaker is different from that of the invention of claim 2. That is, two circuit breakers are arranged so as to be sandwiched between the two main buses. According to the invention of claim 3 as described above, in addition to the function and effect of the invention of claim 1,
The distance between the circuit breakers can be shortened, and the bus length of the connecting bus bar that connects the upper connection ports can be shortened.

According to a fourth aspect of the present invention, in the gas-insulated switchgear according to any one of the first to third aspects, one of the two circuit breakers is replaced by a gas-insulated bus bar. It is characterized by being arranged. According to the invention of claim 4, the gas insulated busbar is used instead of the single circuit breaker, so that the circuit breaker can be used as a dummy circuit breaker. Therefore, it is possible to suppress the initial investment when constructing the power plant and substation and the like, and it is possible to exhibit excellent economic efficiency.

According to a fifth aspect of the present invention, in the gas-insulated switchgear according to any one of the first to fourth aspects, a current transformer, an instrument transformer and a ground switch are provided between the two circuit breakers. At least one of the vessels is arranged.
According to the invention of claim 5, by arranging at least one of the current transformer, the instrument transformer and the grounding switch between the two circuit breakers, the application range of the external connection line is improved. Can be expanded.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An example of an embodiment of the present invention will be specifically described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same member in each embodiment. (1) First embodiment [1-1. Configuration] The first embodiment corresponds to claims 1 and 2, and FIG. 1 shows a single line connection diagram of the first embodiment. Two main busbars 1a and 1b are arranged, and disconnectors 2a and 2 are provided at the ends of the main busbars 1a and 1b, respectively.
b, grounding switches 3a and 3b, current transformers 4a and 4b, circuit breakers 5a and 5b, and current transformers 6a and 6b are sequentially connected.
The two circuit breakers 5a, 5b are connected to the connection terminals on the opposite side of the main buses 1a, 1b, and a ground switch 7 and a cable head 8 for external connection are arranged and connected between them. By connecting and arranging the devices in this way, a bus bar section line is formed and at the same time, an external connection line is formed.

Next, with reference to FIGS. 2 and 3, a concrete arrangement example of the equipment will be described. 2 is a plan view of the first embodiment, and FIG. 3 is a side view of the same. Ie 2
The two main buses 1a and 1b are arranged parallel to the installation surface and parallel to each other. Disconnectors 2a, 2b and earthing switches 3a, 3b are arranged above the main buses 1a, 1b, and connection ports are led to the outsides of the two main buses 1a, 1b in the disconnectors 2a, 2b. Has been done.

The circuit breakers 5a and 5b have their operating axes perpendicular to the installation surface and are arranged outside the main buses 1a and 1b, respectively. Lower connection ports 5aα, 5bα and upper connection port 5a are provided at the lower and upper portions of each circuit breaker 5a, 5b.
β, 5bβ are formed. Of these, the lower connection port 5
aα and 5bα are led out so as to face the connection ports of the disconnectors 2a and 2b, and both are connected through current transformers 4a and 4b. On the other hand, the upper connection ports 5aβ, 5bβ are led out so as to face each other on the same horizontal line in the inner direction of the main buses 1a, 1b, and the both are connected via the connection bus S. A grounding switch 7 is arranged on the connecting bus S, and a cable head 8 for external connection is arranged and connected. Further, the cable head 8 is arranged such that its axis is perpendicular to the installation surface, and the power cable 9 is led out from the lower part.

[1-2. Action and Effect] In the first embodiment having the above-described configuration, the main buses 1a and 1b are provided.
Disconnector 2a, 2b, grounding switch 3a, 3b, current transformer 4
The circuit breakers 5a and 5b are connected via a and 4b, the circuit breakers 5a and 5b are connected via a connecting bus S, and then the cable head 8 is arranged and connected between the two circuit breakers 5a and 5b. By adopting such a configuration, it is possible to arrange the bus section line and the external connection line in a composite manner. At this time, 2
There is only one external connection line for each main bus 1a, 1b, but since the circuit breakers 5a, 5b are connected to both sides of the external connection line, it is possible to connect to either main bus 1a, 1b. it can. Therefore, even if the main bus on one side is stopped, it is possible to instantly connect to the other main bus. Therefore, the external connection line can be operated at all times, and there is no risk of impeding the operation of the power plant or the like.

According to such a first embodiment, 1
Even when an external connection line having only a line is used as a line that cannot be stopped, its function is not impaired and excellent safety and reliability can be secured. Moreover, since the number of devices used for one line is sufficient, the number of devices used can be significantly reduced, which can contribute to a reduction in the layout space and cost. Further, in the first embodiment, since the main busbars 1a and 1b are arranged inside the two circuit breakers 5a and 5b, the direction orthogonal to the axis of the main busbars 1a and 1b (left and right in FIGS. 2 and 3). There is also an advantage that the arrangement space in (direction) can be reduced.

(2) Second Embodiment [2-1. Configuration] The second embodiment corresponds to claims 1 and 3, and FIG. 4 is a plan view of the second embodiment, and FIG.
Shows its side view. The feature of the second embodiment resides in the arrangement configuration of the main buses 1a and 1b and the circuit breakers 5c and 5d, and is the same as the first embodiment except the following points. That is, in the second embodiment, each main bus 1a,
Circuit breakers 5c and 5d are arranged inside 1b. Therefore, the lead-out direction of the connection ports of the disconnectors 2c and 2d connecting the main buses 1a and 1b and the circuit breakers 5c and 5d is the inner direction of the main buses 1a and 1b. Also, the upper connection ports 5cβ, 5dβ of the circuit breakers 5c, 5d face the same straight line in the opposite direction to the lower connection ports 5cα, 5dα, that is, in the same direction as the derivation direction of the disconnectors 2a, 2b. Have been derived to.

[2-2. Action and Effect] In the second embodiment having the above-described configuration, in addition to the action and effect of the first embodiment, two circuit breakers 5a and 5b are provided between the two main buses 1a and 1b. Since it has been placed, circuit breaker 5
The distance between c and 5d can be shortened. Therefore, the connection bus S connecting the upper connection ports 5cβ, 5dβ
The bus length of can be shortened, which can contribute to effective use of the arrangement space.

(3) Third Embodiment [3-1. Configuration] The third embodiment corresponds to claim 4, FIG. 6 is a plan view of the third embodiment, and FIG. 7 is a side view of the same. The third embodiment is characterized in that the current transformers 4b and 6b are omitted and a dummy circuit breaker 10 made of a gas-insulated bus bar is arranged instead of the circuit breaker 5b.

[3-2. [Effects] In many cases, power plants and substations are initially started to be used on a small scale, such as a generator, and then expansion / capacity increase is often carried out in response to demand for increased power demand. In such cases, it is desirable to reduce the initial investment by reducing the number of facilities as much as possible at the beginning. Therefore, in the third embodiment, only the circuit breaker 5a is used in the initial state, the function of the bus bar section line is not impaired, and the external connection line is operated for the time being connected to the main bus line 1b side. When the circuit breaker 5b is needed, the dummy circuit breaker 10 can be removed and the circuit breaker 5b can be easily connected. Although the third embodiment is applied to the first embodiment, it is obvious that it is applicable to the second embodiment.

(4) Other Embodiments The present invention is not limited to the above embodiments,
For example, as an embodiment corresponding to the invention of claim 5,
At least one of a current transformer, an instrument transformer, and a ground switch may be arranged between the two circuit breakers 5a and 5b. According to such an embodiment, the application range of the external connection line can be expanded. Further, in the above description, only the main bus has been described as a three-phase batch type, and the others have been described as a single-phase type, but a gas insulated switchgear of all three-phase batch type configured with a three-phase batch type other than the main bus may also be used. It is easily configurable.

[0023]

As described above, according to the gas-insulated switchgear of the present invention, even if the external connection line cannot be stopped, it is possible to arrange the bus section line and the external connection line in combination. It is possible to configure with an arrangement space for one line without impairing the function, and it is possible to contribute to downsizing and cost reduction by reducing the components and the arrangement space.

[Brief description of drawings]

FIG. 1 is a single wire connection diagram according to a first embodiment of the present invention.

FIG. 2 is a plan view of the first embodiment.

FIG. 3 is a side view of the first embodiment.

FIG. 4 is a plan view of the second embodiment of the present invention.

FIG. 5 is a side view of the second embodiment.

FIG. 6 is a plan view of the third embodiment of the present invention.

FIG. 7 is a side view of the third embodiment.

FIG. 8 is a single wire connection diagram of a conventional gas insulated switchgear.

FIG. 9 is a plan view of a conventional bus section line.

FIG. 10 is a side view of a conventional bus section line.

FIG. 11 is a plan view of a conventional external connection line.

FIG. 12 is a side view of a conventional external connection line.

[Explanation of symbols]

1a, 1b, 11a, 11b ... Main buses 2a, 2b, 2c, 2d, 12a, 12b, 21a, 2
1b ... Disconnectors 3a, 3b, 7, 13a, 13b, 22a, 22b, 2
6a, 26b ... Grounding switches 4a, 4b, 6a, 6b, 14a, 14b, 23a, 2
3b, 25a, 25b ... Current transformers 5a, 5b, 5c, 5d, 15, 24a, 24b ... Circuit breakers 5aα, 5bα, 15α, 24aα ... Circuit breaker lower connection ports 5aβ, 5bβ, 15β, 24aβ ... Circuit breakers Upper connection ports 8, 27a, 27b ... Cable head 9 ... Power cable 10 ... Dummy circuit breaker S ... Connection bus bar

Claims (5)

[Claims] 1. Two main busbars are arranged, the circuit breaker is connected to each of the main busbars via a disconnector, a ground switch, and a current transformer, and the two circuit breakers are connected to each other. 2 more
A gas-insulated switchgear in which a cable head for connecting a power cable is arranged and connected between the circuit breakers of the table. 2. Two main busbars parallel to the installation surface are arranged in parallel with each other, and a disconnector and a ground switch are arranged on the upper part of the mainbus, and the disconnector is located outside the two main busbars. A connection port is led out in a direction, and a circuit breaker whose operating axis is perpendicular to the installation surface is arranged outside each of the main buses.
Each of the circuit breakers is formed with a lower connection port facing the connection port of the disconnector and an upper connection port facing the same horizontal line inward of the two main buses. Port and the lower connection port of the circuit breaker are connected via a current transformer, the upper connection ports of each circuit breaker are connected by a connection busbar, and a grounding switch is arranged on the connection busbar and power is supplied. A gas-insulated switchgear in which a cable head for cable connection is arranged and connected. 3. Two main busbars parallel to the installation surface are arranged in parallel with each other, and a disconnector and a ground switch are disposed above the main busbar, and the disconnector is inside the two main busbars. The connection port is led out in the direction, and a circuit breaker in which the operating axis is perpendicular to the installation surface is arranged inside each of the main buses.
Each of the circuit breakers is formed with a lower connection port facing the connection port of the disconnecting switch and an upper connection port facing the same straight line in a direction opposite to the lower connection port, and connecting the disconnecting switch. Port and the lower connection port of the circuit breaker are connected via a current transformer,
The upper connection ports of each of the circuit breakers are connected by a connecting bus bar,
A gas-insulated switchgear, wherein a ground switch is arranged on the connection bus and a cable head for connecting a power cable is arranged and connected. 4. The gas-insulated switchgear according to claim 1, wherein a gas-insulated bus bar is arranged in place of one of the two circuit breakers. apparatus. 5. At least one of a current transformer, an instrument transformer, and a grounding switch is arranged between the two circuit breakers. A gas-insulated switchgear according to item.