JP2000312414A - Gas insulated breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate vertical bus and realize low-cost and improvement in reliability and vibration resistance by arranging an instrument transformer and an arrester at the lower part of the container, and then forming a drawer in the power receiving side at the side surface in the upper part of the container. SOLUTION: An instrument transformer 2 and an arrester 3 are arranged at the lower part within a container 20, and a drawer 21 is formed in the upper and side portion of the container 20. The container 20 accommodates, at its side surface, a grounded switch 4 for line, a circuit breaker 5 for line and an operation box to drive a grounded switch 6 for working. As explained above, since the instrument transformer 2 and arrester 3 are arranged at the lower part of the container 20, the drawer 21 can be arranged at the upper side of the operation box 41. Therefore, operation space of the operation box 41 can be reserved and a horizontal bus 30 can be connected in direct to the drawer 21. Accordingly, the vertical bus arranged to reserve the operation space can be eliminated and a low cost, highly reliable and small size gas insulated breaker using a less number of parts can be attained.

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 installed in a substation or the like, and more particularly to a gas insulated switchgear having an improved arrangement of power receiving units.

[0002]

2. Description of the Related Art In substations and switchyards installed around large cities and seaside areas, electrical equipment such as transformers and switchgear is insulated from SF6 gas or the like due to difficulty in obtaining land or salt damage. In addition, a gas-insulated switchgear sealed with an insulating medium having an excellent arc-extinguishing property is used. In this type of gas insulated switchgear, a plurality of electric devices are accommodated in one container with a short insulation distance between each other, so that the entire device can be significantly reduced in size.

Hereinafter, a conventional gas insulated switchgear will be described with reference to FIGS. FIG. 10 shows a single-line diagram of each electric device constituting the conventional gas insulated switchgear. In FIG. 10, the air-insulated power receiving lines A and B are PCs.
It is connected to transformer lines D and E via a T line C.
The power receiving lines A and B are respectively connected from the air-insulated bushing 1 to the instrument transformer 2, the lightning arrester 3, the line ground switch 4, the line disconnector 5, the work ground switch 6, the circuit breaker 7, and the work The PCT line C comprises a PCT 9, a three-phase instrument transformer 10, and a working ground switch 6, and the transformer lines C and D are respectively bus disconnectors. It comprises a switch 8, a circuit breaker 7, a three-phase type instrument transformer 10, and a working earthing switch 6.

FIGS. 8 and 9 show a side view and a plan view of power receiving lines A and B in the gas insulated switchgear having the above-described connection configuration. That is, as shown in the side view of FIG.
From the instrument transformer 2 via the horizontal bus 30 and the vertical bus 31
The lightning arrester 3, the grounding switch for the track 4, the disconnector for the track 5, and the working grounding switch 6 are connected to the drawer 21 of the container 20 having a built-in switch. Ground switch 6 and bus disconnector 8. The instrument transformer 2 and the lightning arrester 3 are arranged on the upper part of the container 20. The container 20 has a track grounding switch 4, a line disconnecting switch 5, and a working grounding switch 6 for driving. Operation box
40 and 41 are equipped on the side. Also, as shown in the plan view of FIG.
And a horizontal bus 30 formed substantially at right angles to the axis of the circuit breaker 7
It is connected to the.

In the gas switchgear configured as described above, the instrument transformer 2, the lightning arrester 3, the line grounding switch 4, the line disconnecting switch 5, and the working grounding switch 6 are built in the container 20. As a result, the number of parts can be reduced and the cost can be reduced, and the size of the entire gas insulated switchgear can be reduced to reduce the weight of the equipment and provide excellent earthquake resistance.

[0006]

As described above, in the conventional gas insulated switchgear, the vessel 20 has a line grounding switch 4, a line disconnecting switch 5, and an operation for driving the working grounding switch 6. Boxes 40 and 41 are provided on the side. This operation box 40,
41 requires manual operation from the bushing 1 side for inspection, etc., and to secure the operation space,
The horizontal bus bar 30 formed substantially perpendicular to the axis of the container 20 and the circuit breaker 7 is disposed above a vertical bus bar 31 arranged in the vertical direction. Arranging the vertical buses 31 in this way increases the number of parts and increases the cost, and has a problem in reliability. Further, since the vertical bus bar 31 is arranged adjacent to the container 20, there is a drawback that the installation area becomes large. For these problems, it is conceivable to increase the position of the drawer 21 of the container 20 and directly connect the horizontal bus 30 to secure an operation space.However, by increasing the position of the drawer 21 of the container 20, Heavy instrument transformer 2, surge arrester 3
Is also higher. For this reason, the center of gravity of the gas-insulated switchgear is increased, and there is a problem in terms of earthquake resistance.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and has as its object to provide a small-sized gas insulated switchgear which is low in cost, has high reliability and is excellent in earthquake resistance without the need for the vertical bus 31. And

[0008]

In order to achieve the above object, a first aspect of the present invention is to accommodate a work earthing switch, a line disconnector, a line earthing switch, an instrument transformer, an arrester, and the like. A vertically insulated container, a gas-insulated switchgear having a circuit breaker-side lead portion connected to a circuit breaker and a power receiving portion-side lead portion connected to a power receiving portion formed on a side surface of the container. A transformer for the instrument and a lightning arrester are disposed in the container, and the power-receiving-unit-side lead-out portion is formed on at least a side surface of an upper portion of the container. A second aspect of the present invention is configured such that the power receiving unit side drawer and the circuit breaker side drawer are formed substantially at right angles to each other.

According to a third aspect of the present invention, a plurality of power-receiving-portion-side lead-out portions are formed in an upper portion of the container. According to a fourth aspect of the present invention, a shielding plate is provided between the line ground switch and the instrument transformer and the surge arrester in the container.

[0010] In the gas insulated switchgear of the above configuration,
An instrument transformer and lightning arrestor are arranged in the lower part of the container, and the power receiving part side draw-out part is formed on the upper part of the container so as to be above the instrument transformer and lightning arrestor, so that operation space for switches and the like is secured it can. In addition, by connecting a horizontal bus bar to which a bushing is attached directly to the power receiving unit side drawer, a vertical bus bar for securing operation space can be deleted. Also,
The line axis direction can be shortened by forming the power receiving unit side drawer and the circuit breaker side drawer at right angles to each other, and by forming a plurality of power receiving unit side drawers in the container. In addition, by installing a shielding plate between the instrument transformer and lightning arrestor located in the lower part of the container and the grounding switch for the line, foreign matter generated when the electromagnetic induction current of the transmission line is opened and closed by the grounding switch for the line is removed. , Can be prevented from falling into the instrument transformer and the lightning arrester.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, first to fourth embodiments of the gas insulated switchgear according to the present invention will be described with reference to FIGS. In the first embodiment, as shown in the side view of FIG. 1, a power receiving line is connected to an instrument transformer 2, a lightning arrester 3, and a line grounding switch from an air-insulated bushing 1 via a horizontal bus 30. 4, a line disconnecting switch 5, a work grounding switch 6, which is connected to a drawer 21 of a container 20 having a built-in work grounding switch 6, and from a drawer 22 of the container 20 via a circuit breaker 7; It is connected to the disconnector 8. The instrument transformer 2 and the lightning arrester 3 are disposed in the lower part of the container 20, and the drawer 21 is
20 are formed on the upper side. The container 20 is provided with operation boxes 40, 41 for driving the track grounding switch 4, the track disconnecting switch 5, and the working grounding switch 6 on the side. As shown in the plan view of FIG. 2, the bushing 1 is connected to a horizontal bus 30 formed substantially at right angles to the axis of the container 20 and the circuit breaker 7,
The horizontal bus 30 is configured to be directly connected to the lead-out section 21.

In the first embodiment of the present invention configured as described above, by disposing the instrument transformer 2 and the lightning arrester 3 in the lower part of the container 20, the drawer 21 can be connected to the operation box 40, 41
The operation space for the operation boxes 40 and 41 can be secured, and the horizontal bus 30 can be directly connected to the drawer 21.

According to the first embodiment, the vertical bus bar provided in the conventional gas insulated switchgear to secure operation space can be eliminated, the number of parts is small, the cost is low, and the compact size is high. A gas insulated switchgear can be provided.

FIG. 3 is a side view of a second embodiment of the present invention. The inside of the container 20 has the same configuration as that of the first embodiment. As shown in the plan view of FIG. 4, a drawer 21 for connecting a power receiving unit is formed in the container 20 in a direction substantially perpendicular to a drawer 22 for connecting to the circuit breaker 7. Horizontal bus 30 arranged linearly from 21
It is configured to be connected via. In the second embodiment configured as described above, the drawer 21 is connected to the container.
By forming the horizontal bus bar 30 in a substantially right-angle direction at 20, the horizontal bus bar 30 can be arranged in a straight line and can be directly connected to the drawer 21.

According to the second embodiment, the horizontal bus 30
To provide a compact and highly reliable gas insulated switchgear having a reduced axial length from the line to the bus disconnector 8 and the like, a reduced installation area for the gas insulated switchgear, reduced equipment weight and excellent seismic resistance. be able to.

Next, a third embodiment of the gas insulated switchgear of the present invention will be described. FIG. 5 shows a side view of the third embodiment. The inside of the container 20 has the same configuration as that of the first embodiment. At the upper part of the container 20, one drawer 21 for connecting the power receiving part in a substantially vertical direction is formed. Further, as shown in the plan view of FIG. 6, two drawers 21 for connecting the power receiving part are formed on the side of the container 20 in a direction substantially perpendicular to the drawer 22 connected to the circuit breaker 7. I have. The bushing 1 is connected directly to the upper drawer 21 and to the side drawer 21.
Are connected to each other via a horizontal bus bar 30 arranged linearly in the horizontal direction.

In the third embodiment configured as described above, the drawer 21 is arranged in the container 20 in a substantially horizontal right-angle direction and a substantially vertical direction, thereby shortening the horizontal bus bar 30 connecting the bushing 1. be able to. According to the third embodiment, the horizontal bus is shortened, the installation area of the gas insulated switchgear can be reduced, and a small and highly reliable gas insulated switchgear can be provided.

Next, the fourth embodiment differs from the above-mentioned three embodiments in that a shielding plate 50 is provided as shown in the side view of FIG. That is, the shield plate 50 is disposed between the instrument transformer 2 and the lightning arrester 3 and the line grounding switch 4 disposed in the lower portion inside the container 20.

In the fourth embodiment constructed as above, foreign substances such as arcs and discharge products generated when the electromagnetic induction current of the transmission line is opened and closed by the line earthing switch 4 are shielded by the shielding plate 50. Can be shielded.

According to the fourth embodiment, a gas-insulated switchgear can be prevented in which foreign matter generated when the electromagnetic induction current is switched on and off can be prevented from falling to the instrument transformer and the lightning arrester, and there is little trouble and deterioration over time. can do. The present invention is not limited to the above embodiments, but can be selected as appropriate, such as the specific arrangement and configuration, the shape of the container, and the number of electrical devices.

[0021]

As described above, according to the present invention,
It is possible to provide a small-sized gas-insulated switchgear with a low number of parts and a low cost and high reliability. Also, since the line axis direction is short, a small and highly reliable gas insulated switchgear having a small installation area and a reduced weight, having excellent seismic resistance, can be provided. Further, it is possible to prevent a foreign substance generated when the electromagnetic induction current is opened and closed from dropping into the instrument transformer or the lightning arrester, and to provide a gas insulated switchgear with less trouble and deterioration over time.

[Brief description of the drawings]

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

FIG. 2 is a plan view of the gas-insulated switchgear according to the first embodiment of the present invention.

FIG. 3 is a side view of a gas-insulated switchgear according to a second embodiment of the present invention.

FIG. 4 is a plan view of a gas-insulated switchgear according to a second embodiment of the present invention.

FIG. 5 is a side view of a gas-insulated switchgear according to a third embodiment of the present invention.

FIG. 6 is a plan view of a gas-insulated switchgear according to a third embodiment of the present invention.

FIG. 7 is a side view of a gas-insulated switchgear according to a fourth embodiment of the present invention.

FIG. 8 is a side view of a conventional gas insulated switchgear.

FIG. 9 is a plan view of a conventional gas insulated switchgear.

FIG. 10 is a single-line diagram of a conventional gas-insulated switchgear.

[Explanation of symbols]

1: Bushing, 2: Transformer for instrument, 3: Lightning arrester, 4:
Track grounding switch, 5: Track disconnecting switch, 6: Work grounding switch, 7: Lightning arrester, 8: Busbar disconnecting switch, 9: PCT,
10… Transformers for three-phase instruments, 11… Transformers, 20… Containers, 21…
Power receiving part side drawer part, 22 ... breaker side drawer part, 30 ... horizontal bus, 31 ... vertical bus, 40, 41 ... operation box, 50 ... shielding plate, A,
B: power receiving line, C: PCT line, C, D: transformer line.

Claims (4)

[Claims] 1. A container containing a working earthing switch, a line disconnector, a line earthing switch, an instrument transformer, an arrester, etc., is vertically arranged, and a circuit breaker is connected to a circuit breaker on a side surface of the container. In a gas insulated switchgear having a power receiving unit side drawing unit connected to a power receiving unit side and a power receiving unit, an instrument transformer and a lightning arrester are arranged at a lower portion in the container, and the power receiving unit side drawing unit is provided. A gas insulated switchgear formed on at least a side surface of an upper portion of the container. 2. The gas insulated switchgear according to claim 1, wherein the power receiving unit side drawer and the circuit breaker side drawer are formed substantially at right angles to each other. 3. The gas-insulated switchgear according to claim 1, wherein a plurality of power-receiving-portion-side lead-out portions are formed in an upper portion of the container. 4. The gas insulated switchgear according to claim 1, wherein a shield plate is provided in the vessel between the line ground switch, the instrument transformer and the surge arrester.