JPH1094118A - Gas-insulated switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To lessen the dimension in height by arranging and connecting a disconnector on the second bus side horizontally at the junction under a disconnector on the first bus side, and arranging and connecting a first main bus in the horizontal direction of the disconnector on the first bus side, and also arranging and connecting a second main bus in the horizontal direction of the disconnector on the second bus side. SOLUTION: The connection of an apparatus on bus side can be performed properly by arranging a disconnector 7 of horizontal arrangement on the bus side and a main bus 7 in order in the horizontal direction of the lower terminal 1b of a disconnector 1d, and arranging a disconnector 8 of horizontal arrangement on the bus side and a main bus 10 in horizontal direction. That is, in such an arrangement, since the space required under the lower terminal 1b of the disconnector 1 is about the diameter dimensions of the tanks of these apparatuses, the dimension in height from the floor level to the lower terminal 1b of the breaker 1 can be reduced to the indispensable minimum dimension, decided by the dimension of a breaker 1 itself. Accordingly, the aseismatic strength can be exceptionally, improved so it is not necessity to provide aseismatic structure.

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 in which a bus, a disconnector, a circuit breaker, and the like are housed in an airtight container together with an insulating medium.

[0002]

2. Description of the Related Art In substations or switchyards installed around large cities or seaside areas, due to difficulties in obtaining land and countermeasures against salt damage, the size of electric stations has been greatly reduced.
In recent years, many gas-insulated switchgears in which a switchgear body is housed together with an insulating gas have been employed for the purpose of reducing noise, improving antifouling performance, and improving aesthetic appearance. In this type of gas insulated switchgear, required equipment such as a circuit breaker or disconnector is three-dimensionally arranged to reduce the interval between each equipment. The size can be reduced, and the site area can be significantly reduced.

[0003] A specific equipment arrangement of such a gas insulated switchgear will be described with reference to a double bus type gas insulated switchgear shown in FIG. 2 as an example. A line-side device 2, for example, a line-side disconnector 3, and grounding switches 4 and 5, are connected to an upper terminal 1a of the circuit breaker 1 having the vertical arrangement 1b. Further, two vertically arranged busbar-side disconnectors 7, 8 are arranged in the horizontal direction and connected to the lower terminal 1b of the circuit breaker 1. Below these bus-side disconnectors 7, 8 are main buses 9,
10 are arranged and connected. In the figure, 6 indicates a grounding switch, 11 indicates a current transformer, and 71 and 81 indicate operating mechanisms.

[0004]

In the arrangement of each device in such a conventional gas insulated switchgear, the bus-side disconnectors 7, 8 are vertically arranged above the main buses 9, 10. The position at which the bus-side disconnector 7 and the lower terminal 1b of the circuit breaker 1 are connected to each other becomes higher, and as shown in FIG.

[0005] Therefore, when the arrangement shown in Fig. 2 is adopted, there is a problem that the height of the entire gas insulated switchgear is increased and the seismic strength is reduced. In some cases, a special seismic structure must be provided. Must. In addition, when installing in a building or basement, it may be difficult to secure the required installation space, especially due to restrictions on height dimensions. When trying to secure,
Various inconveniences are caused, such as a large increase in construction costs.

On the other hand, since the bus-side disconnectors 7 and 8 are installed vertically, the insulating spacers 73 and 83 are arranged immediately below the contacts 72 and 82. Therefore, the molten metal powder and the sliding metal powder generated by the current switching of the contacts 72 and 82 may accumulate on the surfaces of the insulating spacers 73 and 83 to contaminate them, which may cause a serious accident leading to dielectric breakdown. is there.

An object of the present invention is to solve the problems of the prior art and to provide a highly reliable gas-insulated switchgear having a small dimension in the height direction and capable of preventing contamination of an insulating spacer. Is what you do.

[0008]

SUMMARY OF THE INVENTION A gas insulated switchgear according to the present invention comprises a vertically arranged circuit breaker having terminals on the upper and lower sides, a line-side device connected to an upper terminal of the circuit breaker, and the circuit breaker. A gas-insulated switchgear having first and second bus-side disconnectors connected to the lower terminal of the vessel, and first and second main buses connected via these bus-side disconnectors; A first bus-side disconnector having a branch in a downward direction and a horizontal direction is arranged and connected to a lower terminal of the circuit breaker, and a second branch of the first bus-side disconnector is connected to a second branch in a downward direction.
Bus-side disconnectors are arranged and connected in a horizontal position.
, A first main bus is arranged and connected in the horizontal direction of the bus-side disconnector, and a second main bus is arranged and connected in the horizontal direction of the second bus-side disconnector.

In the present invention, a first bus-side disconnector arranged horizontally is disposed in a horizontal direction of a lower terminal of the circuit breaker.
Below that, the second bus disconnectors arranged horizontally are arranged, and the first and second main buses are arranged in the horizontal direction of each bus disconnector. Can be performed appropriately. In such an arrangement, the space required below the lower terminal of the circuit breaker is about the tank diameter of these devices, so the lower terminal of the circuit breaker is connected to the first bus-side disconnector. The position can be lowered.

Therefore, in the case of the arrangement of the present invention, the height of the entire gas insulated switchgear can be reduced to the minimum necessary height determined by the height of the circuit breaker itself, so that the seismic strength is remarkably improved. Can be improved. In addition, when installing a gas-insulated switchgear with such a small height in a building or a basement, there is no problem of height restrictions, so it is easy to secure the required installation space. Therefore, there is no problem that construction costs increase, which is convenient. Further, since there is no possibility that the insulating spacer is contaminated by the molten metal powder or the sliding metal powder generated by the current switching of the contacts of the first and second bus-side disconnectors, a serious accident such as a dielectric breakdown may occur. Can be avoided, and the reliability can be improved.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an embodiment showing the equipment arrangement of the gas insulated switchgear according to the present invention will be specifically described with reference to FIG. In FIG. 1, the same devices as those in FIG. 2 are denoted by the same reference numerals.

In FIG. 1, an upper terminal 1a of a vertically arranged circuit breaker 1 having two terminals 1a and 1b above and below the same side surface is connected via a current transformer 11 to a line-side device 2, for example, The line-side disconnector 3, the ground switches 4, 5 and the like are connected. A current transformer 1 is connected to a lower terminal 1b of the circuit breaker 1.
1, the terminal 7b of the T-shaped first bus-side disconnector 7 is connected. The first bus-side disconnector 7 is disposed horizontally with branches in both horizontal and vertical directions, and a second bus-side disconnector 8 is disposed horizontally below the first busbar disconnector 8. , Terminal 8b.

On the other hand, main buses 9 and 10 are vertically arranged in the tank axis direction of the bus-side disconnectors 7 and 8, and the tank-axial terminals 7a and 8 of these bus-side disconnectors 7 and 8 are arranged.
a is connected to the main buses 9 and 10 from the horizontal direction, respectively.

In this embodiment having the above-described configuration, the bus-side disconnector 7 and the main bus 9 which are horizontally arranged are sequentially arranged in the horizontal direction of the lower terminal 1b of the circuit breaker 1, and below them. By arranging the bus-side disconnector 8 and the main bus 10 in the horizontal arrangement in the horizontal direction, it is possible to properly connect the devices on the bus-side. That is, in such an arrangement, the space required below the lower terminal 1b of the circuit breaker 1 is about the tank diameter of these devices, so the height from the floor level to the lower terminal 1b of the circuit breaker 1 is large. The directional dimension can be reduced to the minimum necessary dimension determined by the dimensions of the circuit breaker 1 itself. Therefore, the seismic strength can be significantly improved,
There is no need to provide a special earthquake-resistant structure. In addition, when installed in a building or in a basement, there is no problem of height restrictions as in the prior art, so it is easy to secure the required installation space, and construction costs increase. It is convenient without any problems.

On the other hand, since the bus-side disconnectors 7 and 8 are disposed horizontally, the insulating spacers 73 and 83 are not disposed immediately below the contacts 72 and 82. Therefore, there is no possibility that the insulating spacers 73 and 83 will be contaminated by the molten metal powder or the sliding metal powder generated by the current switching of the contacts 72 and 82, and it is possible to avoid a serious accident such as dielectric breakdown. Therefore, the reliability is improved.

[0016]

As described above, according to the present invention, the first bus-side disconnector having a downward branch is connected to the lower terminal of the circuit breaker in a horizontal arrangement. 2 are connected in a horizontal arrangement, and the first and second main buses are connected in the horizontal direction of the first and second bus-side disconnectors, respectively. A highly reliable gas insulated switchgear having a small size and preventing contamination of the insulating spacer can be obtained.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram showing an embodiment of a gas insulated switchgear of the present invention.

FIG. 2 is a schematic configuration diagram showing a device arrangement of a conventional gas insulated switchgear.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Circuit breaker 2 ... Line-side equipment 7, 8 ... Bus-side disconnector 9, 10 ... Main bus 72, 82 ... Contact 73, 83 ... Insulation spacer

Claims (1)

[Claims] 1. A circuit breaker in a vertical arrangement having terminals on upper and lower sides, a line-side device connected to an upper terminal of the circuit breaker, and first and second terminals connected to a lower terminal of the circuit breaker.
In a gas insulated switchgear having a bus-side disconnector and first and second main buses connected via these bus-side disconnectors, a lower terminal of the circuit breaker A first bus-side disconnector having a branch is horizontally disposed and connected, and a second bus-side disconnector is horizontally disposed and connected to a downward branch of the first bus-side disconnector. A gas characterized in that a first main bus is arranged and connected in a horizontal direction of a first bus-side disconnector, and a second main bus is arranged and connected in a horizontal direction of a second bus-side disconnector. Insulated switchgear.