JPH03251010A - Gas insulated contactor - Google Patents

Abstract

PURPOSE:To miniaturize equipment and reduce an area for mounting the equipment by connecting a case for 'CT' provided with horizontal and vertical connecting sections at the external end of a line of equipment such as a disconnecting switch, a ground device, provided in a connecting section located at the line side of a circuit breaker. CONSTITUTION:A tank 1 of a bus bar disconnecting switch DS1 and a tank 2 containing a bus bar disconnecting switch DS2 and a ground switch ES1 for circuit breaker maintenance inspection, are respectively connected to main bus bars BuS1 and BuS2 laid in parallel, and connected to an outlet section C2 located at the lower part of a circuit breaker CB. Also, a tank 3 containing a line side disconnecting switch DS3, a ground switch ES2 for circuit breaker maintenance inspection and a line side ground switch ES3 is connected to an outlet section C1 at the upper part of the circuit breaker CB. In addition, a horizontal connecting section 4a and a vertical connecting section 4b are formed in a tank 4 for 'CT' use to be connected to the tank 3, in which the horizontal connecting section 4a is connected, and an air bushing Bg and equipment not shown are connected in the vertical connecting section 4b.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to a gas insulated switchgear having a voltage transformer (CT) at the end of one line.

(Prior art) Gas-insulated switchgear is constructed by housing circuit breakers, disconnectors, etc. in a container filled with SF, gas, etc. with excellent insulation and arc-extinguishing properties, and also combining equipment such as busbars. has been done. This type of switchgear can be configured to be significantly smaller than an air-insulated switchgear. In particular, in recent years, due to the remarkable rise in land prices, etc., gas insulated switchgears, which can be made smaller, have been increasingly used in substations. Furthermore, by rationally arranging the components,
- The layers can be made smaller, making it possible to reduce the cost and size of the gas insulated switchgear.

FIGS. 4 to 6 show examples of the arrangement and configuration of conventionally used gas insulated switchgears. That is, FIG. 4 shows a typical single-line connection diagram having a current transformer (CT) at the end of the line, and FIGS. 5 and 6 show the arrangement of the equipment. In FIG. 5, the disconnecting section of the disconnecting switch DS2 and the maintenance earthing switch ES of the circuit breaker CB, which are arranged perpendicularly to the axis of the second bus bar BuS2, are combined into one container 2.
The container 1 is connected to a container 1 which houses a disconnecting section of a disconnecting switch DS1 which is disposed in a direction orthogonal to the axis of the container 2 and the first bus line BuS. The containers 1 and 2 are connected to the lower connection terminal C2 of the circuit breaker CB, while the upper connection terminal C1 of the circuit breaker CB is connected to the line side disconnector DS,
, a maintenance earthing switch ES2 of the circuit breaker CB, and a track side earthing switch ES housed in one container 3 are connected.

Further, an L-type connection bus BL is attached to the upper connection terminal of the container 3 of the line-side disconnector DS, and the L-type connection bus B
L is a container in which an instrument current transformer CT is housed, and a line-side terminal device, here an air bushing Bg, is connected to the connection part thereof. in this case.

The horizontal and vertical lengths of the above-mentioned connection busbar BL are determined by taking into consideration the distance R between the bushing charging parts, the distance between the lines, and the like.

In addition, in the space below the instrument current transformer CT or the line side terminal equipment Bg, the circuit breaker CB, the disconnector DS
Spaces SP1 to SP3 for maintaining the earthing switches ES□ to ES are provided. Figure 6 shows the 5th
In the figure, a bushing T is housed in the gas-insulated connection bus bar instead of the line-side terminal equipment, which is an air bushing Bg.
The diagram shows the case where .

(Problem to be Solved by the Invention) By the way, in the conventional gas insulated switchgear configured as described above, in order to ensure the separation distance during maintenance of the bushing live part or the separation distance between the lines, ,
An extra closed container must be provided to facilitate connection to the transformer.

Furthermore, even if the purpose could be achieved, there were problems in terms of maintenance and inspection, such as the placement of circuit breakers being staggered.

An object of the present invention is to provide a gas-insulated switchgear that improves the operability, maintainability, and inspection efficiency of equipment, and enables miniaturization of equipment and reduction of building volume.

[Structure of the invention]

(Means for Solving the Problems) The gas insulated switchgear of the present invention has a horizontal connection part and a vertical connection part at the outside end of the line of line side equipment such as a disconnector and a grounding device provided at the line side connection part of the circuit breaker. The present invention is characterized by providing a case for an instrument current transformer having a connecting portion.

(Function) According to the present invention, it is not necessary to prepare an extra sealed container in order to ensure the separation distance from the bushing live part and the separation distance between the lines, or to facilitate the connection with the transformer. Furthermore, it is possible to put into practical use a compact gas-insulated switchgear with a small line depth and no inconveniences in terms of maintenance and inspection, such as alternating placement of circuit breakers.

(Example) The present invention will be described below with reference to an example shown in FIGS. 1 and 2. In FIGS. 1 and 2, the same reference numerals as in FIGS. 4 to 6 indicate the same parts, and therefore the explanation thereof will be omitted.

First, in FIG. 1, a tank 1 of a bus-side disconnect switch DS, a tank 1 of a bus-side disconnect switch DS2, and a tank incorporating an earthing switch ES1 for circuit breaker maintenance and inspection are installed in parallel main buses BuS1 and BuS, respectively. 2, and this is connected to the lower sunrise portion C2 of the circuit breaker CB. In addition, a track-side disconnector DS, a track-side earthing switch ES for circuit breaker maintenance and inspection, and a track-side grounding switch E are installed at the upper sunrise part C□ of the circuit breaker CB.
Tank 3 containing S3 is connected.

In the present invention, one connection part 4a is connected horizontally to the tank 4 of the instrument current transformer CT connected to the line outside part of the line side equipment provided at the line side connection part of the circuit breaker CB, and the other One connecting portion 4b is formed vertically.

In the embodiment shown in FIG. 1, the tank 4 of the instrument current transformer CT
The horizontal connection part 4a of the is connected to the upper surface of the tank 3 containing the track-side disconnector DS3 as shown in the figure, and the vertical connection part 4b is connected to the aerial bushing Bg of the track-side terminal equipment. It is.

Further, in another embodiment shown in FIG. 2, the line side terminal equipment is a bushing housed in the gas insulated bus GIB, and the gas insulated bus GIB is connected to the instrument current transformer C.
It is characterized in that it is connected to the vertical connection part 4b of the tank 4 of the T. Furthermore, in another embodiment shown in FIG.
The case where the transformer TR is installed on the opposite side from the circuit breaker CB is shown.
In this case, the gas insulated bus GIB is arranged in a detour beyond the circuit breaker CB.

〔Effect of the invention〕

As described above, according to one aspect of the present invention, there is provided an instrument in which one of the connection parts is horizontal and at least one of the other connections is vertical, on the outside of the line of the line side equipment provided at the line side connection part of the circuit breaker. By connecting a device with a current transformer case, it is possible to provide a gas-insulated switchgear that improves the operability and ease of maintenance and inspection of the device, and also makes it possible to downsize the device and reduce the building volume. can.

[Brief explanation of drawings]

1, 2, and 3 are side views showing different embodiments of the gas insulated switchgear of the present invention, and FIG. 4 is a double bus system including two bushing lines and two transformer lines. The single-line connection diagram, FIGS. 5 and 6 are side views showing examples of arrangement using conventional equipment. CB...Breaker DS,・DS2...
・Busbar side disconnector DS,...Track side disconnector ES・ES,...Earth switch for maintenance and inspection of circuit breaker ES2...Track side connection switch C/C2...Breaker Connection terminal parts C1 and C2...Connection terminal part CT of circuit breaker...Instrument current transformer 8g...Air bushing T...Line terminal equipment SP construction housed in gas insulated bus bar~ SP2...Maintenance/inspection space R...
Air separation distance BL...L type connection busbar L□・L
2...Line depth dimension TR...Transformer GIB...
・Gas insulated connection busbar

Claims (1)

[Claims] A current transformer case for instrumentation having a horizontal connection part and a vertical connection part is provided at the outside end of the line side equipment such as a disconnector or grounding device connected to the line side connection part of the circuit breaker. gas insulated switchgear.