JPH0620334B2 - Gas insulated switchgear - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas-insulated switchgear unit formed by accommodating required equipment such as a disconnector and a circuit breaker together with a busbar in a cubicle container filled with an insulating gas. The present invention relates to a gas-insulated switchgear in which a plurality of gas-insulated switchgear are arranged in parallel.

2. Description of the Related Art In this type of gas-insulated switchgear, adjacent units are connected to each other via a busbar connecting portion, and the busbar connecting portions connect busbars in adjacent units to each other. Each busbar connecting part is configured so that each unit can be separated from another unit at the busbar connecting part without breaking the airtightness of the units on both sides, and when a flashover accident occurs in one unit, , A unit in which an accident has occurred can be separated from other units so that only a healthy unit can operate. However, in the conventional device, when an accident occurs in the unit at the end of the row board, only one unit in which the accident has occurred needs to have a power failure, but the unit placed in the middle of the row board has an accident. If the accident occurs, disconnect the unit where the accident occurred,
Among the other units connected to the unit, all the units on the opposite side of the power supply point to the device will have a power failure, so that there is a drawback that the number of lines that fail will increase.

It is an object of the present invention to provide a gas-insulated switchgear that can be operated without disconnecting all the other units when a unit in which an accident has occurred is disconnected.

Configuration of the Invention The present invention is a plurality of units of the gas insulated switchgear unit is arranged in a row in a cubicle container filled with insulating gas and the necessary equipment such as a circuit breaker and a disconnector are housed together with a busbar. The busbars are connected to each other via a busbar connecting portion provided between adjacent units, and the gas insulated switchgear unit is separated from the adjacent gas insulated switchgear unit at the busbar connecting portion without breaking the airtightness. A gas-insulated switchgear configured to obtain, in the present invention, a cubicle of two gas-insulated switchgear units, which are respectively arranged at both ends of the plurality of gas-insulated switchgear units in the juxtaposed direction. On the outer surface of the container, there is provided a cable connecting portion for externally connecting a moving cable to the bus bars of the units at both ends.

In the above device, when an accident occurs in any of the units located in the middle of the row board, the unit in which the accident occurs is separated from the other units, and the outer surface of the cubicle container of the unit located at both ends is separated. The moving cables are connected to the respective cable connection portions, and the busbars of the units at both ends are connected. By doing this, power can be supplied to the unit disconnected from the power supply through the moving cable by disconnecting the unit in which the accident occurred, so all units other than the unit in which the accident occurred can be operated, and a power failure occurs in the event of an accident. The number of lines to be used can be reduced.

In the above configuration, necessary equipment that can be placed in the cubicle container of each gas-insulated switchgear unit is not limited to a circuit breaker and a disconnector, but a grounding device, an instrument transformer, a current transformer,
It includes all the devices necessary for the construction of switchgear such as lightning arresters, and those necessary among these devices are appropriately combined so as to form a predetermined switchgear (in the case of a three-phase gas-insulated switchgear, Stored in each cubicle container (collectively for 3 phases).

Embodiments Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

1 to 3 show an embodiment of the present invention.
FIG. 1 is a perspective view of the same embodiment, and FIG. 2 is a configuration diagram schematically showing the configuration of the same embodiment. Further, FIG. 3 is a configuration diagram showing a state in which a unit in which an accident has occurred is separated in the same embodiment. In FIGS. 1 and 2, 1a to 1e are first to fifth gas-insulated switchgear units arranged in a straight line so as to form a row board, and the units 1a to 1e are respectively the size and shape. Circuit breakers CB and disconnectors D in the same cubicle containers 2a to 2e
It consists of the necessary equipment such as S that is housed together with the busbar BU for three phases, and the busbar BU has each line via the switching circuit composed of the equipment housed in the unit container and the cable head CH. Is connected to a cable C that constitutes The number of gas-insulated switchgear units installed in parallel is arbitrary.

In this embodiment, rectangular parallelepiped-shaped operation device boxes 3a to 3c are arranged on the front surfaces of the cubicle containers 2a to 2e of the gas-insulated switchgear unit 1a to 1e, and these operation device boxes are larger than the cubicle containers 2a to 2e, respectively. It has a width dimension and a predetermined gap 4 is formed between the cubicle containers 2a to 2e when the operation device boxes 3a to 3e are closely arranged as shown in FIG.

Three circular openings 5 are arranged on both side surfaces of the cubicle containers 2a to 2e, which face each other in the juxtaposed direction (hereinafter referred to as the lateral direction), in a direction perpendicular to the juxtaposed direction of the units (hereinafter referred to as the front-rear direction). Has been formed. A nozzle 6 is welded to the periphery of each opening 5, and a flange 7 is provided at the opening end of each nozzle. Of the units 1a to 1e, the openings 5, 5, ... Provided in the cubicle containers of the end units 1a and 1e arranged at both ends in the arranging direction.
Among these, an insulating spacer 8 is attached so as to hermetically close each opening 5 provided on the side surface facing the adjacent unit, and each opening 5 provided on the side surface not facing the adjacent unit is exposed to the outside. An insulating cylinder 9 in the shape of a hollow truncated cone, which is oriented so as to open at, is attached so as to hermetically close each opening 5. The busbars BU of the three phases housed in the cubicle containers of the end units 1a and 1e are positioned parallel to the parallel arrangement direction of the units, and the three openings 5 provided on each side surface of the container. One bus bar is arranged at each central portion, and both ends of each bus bar BU are hermetically pierced through the insulating spacer 8 and the shaft core portion of the insulating cylinder 9 attached to the corresponding openings 5. And supported by an insulating tube.

Three openings 5 are provided side by side in the front-rear direction on the laterally opposite side surfaces of the gas-insulated switchgear units 1b to 1d located in the middle of the row board so as to close the openings airtightly. An insulating spacer 8 is attached to.
The busbars BU of the three phases in these units are also arranged in parallel in the lateral direction, and the busbars of the respective phases are supported by penetrating the shaft core portions of the pair of insulating spacers 8 facing each other.

In the gaps 4 between the units 1a and 1b, between the units 1b and 1c, between the units 1c and 1d, and between the units 1d and 1e, the busbar connecting pipes are laid across the nozzle stubs 6 of the adjacent units facing each other. 11 are arranged, and the flanges 12, 12 at both ends of each of the busbar connecting pipes 11 are airtightly and separably joined to the flanges 7 of the opposed nozzles. The busbar connecting pipes 11 and the busbar connecting conductors 13 for connecting the busbars BU of the adjacent units to each other are housed inside the nozzles connected to the busbar connecting pipes. In this embodiment, each nozzle 6 and the busbar connecting pipe 1 connected to the nozzle 6 are connected.
1 constitutes a busbar connecting portion 14.

A lid 15 is attached to the flange 7 at the end of the outer nozzle 6 attached to the side surface of the end units 1a and 1e that does not face the other units.
The inside is airtightly closed. In this embodiment, a cable connecting portion 16 for connecting a moving cable is formed by the nozzle 6 and the insulating tube 9 outside the end units 1a and 1e. An insulating gas such as SF6 gas is filled in the cubicle container of each gas insulated switchgear unit, each busbar connecting pipe, and the nozzle outside the end unit at a pressure near atmospheric pressure.

In the operation device boxes 3a to 3e, operation devices of the devices stored in the cubicle container are stored, and each operation device is connected to a predetermined device via a link or the like. Although not shown, the bus bar BU of the unit 1a is connected to the power transformer on the back side of the cubicle container of any one unit, for example, on the back side of the unit 1a.

In the above device, when an accident occurs in one unit located in the middle of the row board, for example, the unit 1c, the unit 1c is connected to the adjacent unit 1 at the busbar connecting portions on both sides thereof.
Separated from b and 1c, as shown in FIG.
After the opposed nozzles 6 and 6 of b and 1c are airtightly closed by the lids 17 and 17, the inside of the nozzles 6 and 6 is filled with an insulating gas. Then, as shown in FIG. 3, the moving cables 18 for three phases are prepared, and the conical insulating cylinders 19, 19 attached to both ends of the moving cables 18 for each phase are attached to the end unit 1a,
It is attached to the nozzles 6 and 6 of each phase on the outer side surface of 1e, and the nozzles 6 and 6 are airtightly closed. In this way, when the insulating tube is attached, the terminal portions 20, 20 at both ends of the cable 18 are connected to the busbars BU, BU in the end units 1a, 1e so that each moving cable can provide a sound unit. Connect the busbars of each phase to each other.

EFFECTS OF THE INVENTION As described above, according to the present invention, the transfer cable is externally connected to the outer surface of the cubicle container of the gas-insulated switchgear unit arranged at both ends of the row board to the busbars of the units at both ends. Since a cable connection portion for the purpose is provided, there is an advantage that when the unit in which the accident has occurred is disconnected, all the other healthy units can be operated without power failure.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention.
FIG. 1 is a perspective view of the same embodiment, FIG. 2 is a schematic view showing a structure of the same embodiment, and FIG. 3 is a structure showing a state in which a unit in which an accident has occurred is separated in the same embodiment. It is a figure. 1a to 1e ... Gas-insulated switchgear unit, 2a to 2e
... cubicle container, 3a to 3e ... operator box, 5 ...
… Aperture, 6 …… Stubstock, 11 …… Bus connecting pipe, 14 ……
Busbar connection part, 16 ... Cable connection part, BU ... Busbar,
DS: disconnecting switch, CB: circuit breaker.

Claims (1)

[Claims] 1. A plurality of gas-insulated switchgear units constituted by accommodating required equipment such as a circuit breaker and a disconnector together with a busbar in a cubicle container filled with an insulating gas are arranged side by side in a line to form a plurality of units of the plurality of units. Busbars may be connected to each other via a busbar connecting portion provided between adjacent units, and each gas insulated switchgear unit may be separated at the busbar connecting portion without breaking the airtightness of an adjacent gas insulated switchgear unit. In the gas-insulated switchgear configured as described above, the two gas-insulated switchgear units, which are respectively arranged at both ends of the plurality of gas-insulated switchgear units in the inner side-by-side direction, are provided on the outer surface of the cubicle container. A gas-insulated switchgear characterized in that a cable connecting portion for connecting a transfer cable from the outside is provided on a bus bar of the unit.