JPS6260410A - Gas insulated switching device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a multi-bus type gas insulated switchgear having a measuring current transformer at both ends of a breaker.

[Technical background of the invention and its problems]

Substations and switchyards installed around major cities or coastal areas may be difficult to obtain due to land availability or salt damage countermeasures.
A gas insulated switchgear is used for electrical equipment constituting a substation or switchyard sealed with an insulating medium such as 8F or gas.

This type of gas-insulated switchgear is becoming increasingly high-voltage and large-capacity as the demand for electricity increases in urban areas, and it is also becoming more compact, more reliable, and requires less maintenance. Simplification is required. Therefore, circuit breakers, disconnectors, and other necessary equipment are arranged three-dimensionally, and the distance between each piece of equipment is narrowed to reduce the site area.

The general structure of such a gas insulated switchgear will be explained with reference to a single line diagram in FIG. 2 and a layout diagram in FIG. 3.

That is, FIG. 2 shows a single-line connection diagram for a line in a double-bus system, and the main buses BUS1 and BUS2 are provided with disconnectors D81 and D82, respectively, which are connected to the instrument current transformers CTI and D82. It is connected to one end of the circuit breaker CB via a work earthing switch B81. The other end of the circuit breaker CB is connected to the line disconnector D83 via the work earthing switch gs2 and the instrument current transformer CT2, Two cable connections CHi are connected via a potential transformer PT.

A conventionally known example of a general layout configuration in such a single line diagram is as shown in FIG. 3. That is, the breaker 1 is arranged perpendicularly to the installation surface, and the breaker 1 is provided with an upper outlet terminal portion 2 and a lower outlet terminal portion 3 parallel to the installation surface. A line disconnector 8 and a line earthing switch 9 housed in the same container are connected to the upper outlet terminal section 2 via a work earthing switch 4 and an instrument current transformer 6, 10 and a cable connection section 11 are connected in series.In addition, an instrument transformer 12 is connected above the connection bus bar 10 via an outlet terminal section 10a.

On the other hand, the lower outlet terminal part 3 (ground switch 5 for Nidoma work
and is connected to a connection bus 13 via an instrument current transformer 7. A main bus 16 integrated with the disconnector 14 is connected to the outlet terminal portion 13 a provided in the horizontal direction of the connection bus 13 via a disconnector 14 , and an outlet terminal portion 13 b provided below the connection bus 13 A main bus bar 17, which is integrated with the disconnector 15, is connected to the disconnector 15 via a disconnector 15.

However, in the conventional gas insulated switchgear as shown in FIG. This results in wasted space as shown in the figure. Further, when arranging the cable connection portion 11, it is necessary to avoid the main bus bar 16, so the connection bus bar 10 must be made longer than necessary, and the overall length Ll becomes large. As a result, the installation space for gas-insulated switchgear will increase, but even a small increase in installation space can reduce construction costs, especially in underground substations installed under high-rise buildings, etc. Because of the significant increase in acoustics, increasing the size of the entire device was a major problem.

[Purpose of the invention]

The present invention was proposed in order to solve the above-mentioned drawbacks of the conventional technology, and its purpose is to effectively utilize the structural space by storing a plurality of devices in the same container. It is an object of the present invention to provide a gas insulated switchgear that can reduce the size of the entire device, reduce the installation space of the device, and significantly reduce construction costs.

[Summary of the invention]

In order to achieve the above object, in the present invention, two work earthing switches and one instrument current transformer are housed in a breaker container, and the breaker is connected to other equipment. By providing three lead-out terminals and connecting two main buses and an instrument current transformer to each of them, wasteful space in the configuration is eliminated and the overall size of the device is reduced.

[Embodiments of the invention]

An embodiment of the present invention as described above will be explained in detail with reference to FIG.

In this embodiment, the container 22 of the breaker 21 is installed so that its axis is perpendicular to the installation surface, and inside the container 22 there is a breaker and an instrument current transformer 24.2 fvA. Containers 25, 26 and energized conductors 27, 28 connected to both ends of the breaker field are housed, and three outlet terminals 29, 30, 29, 30, 28 are arranged on the side of the container 22 in a row vertically. 31 are provided.

The current-carrying conductor 27 connected to one end of the breaker field is connected to the upper side of the breaker arm (: via the instrument current transformer U and the working grounding switch 44, inside the breaker container 22). Current-carrying conductors 27a, 27b l branch into two, leading out terminal portion 2
9 and (9), respectively. A main bus U integrated with the disconnector 32 is connected to this outlet terminal unit via a disconnector 32, and a live bus U integrated with the disconnector is connected to the outlet terminal unit 30 through a disconnector 33. It is connected. On the other hand, the current-carrying conductor path connected to the other end 62 of the breaker 23 is connected to a lower terminal portion of the breaker container N via a work earthing switch 26 disposed below the breaker container N. It is derived from 31. An instrument current transformer 36 is connected to this outlet terminal section 31, and the instrument current transformer 36 is connected to a cable connection section 39 via a line disconnector 37 and a line grounding switch section. and the potential transformer 401 disposed above the cable connection section 39: connected. The container 41 of this line disconnector 37 accommodates a line grounding switch section therein, and is arranged so that its axis is perpendicular to the installation surface. The outlet terminal portion 42 provided on the cable connection portion 39 side of this disconnector container 41 is the outlet terminal portion 4 provided on the instrument current transformer 36 side.
It is installed above 3.

In the above embodiment, the breaker 23, instrument current transformer 24, and work earthing switches 5 and 26 are housed inside the breaker container type, and three openings are provided on the side of the breaker container 22. Terminal portions 29, 30, and 31 are provided, and main busbars 34 and 35 are provided at the upper lead terminal portion 29 and the terminal portion, respectively.
The lower outlet terminal portions 311 are connected to the instrument current transformers A and 311, and between the instrument current transformers and the cable connection portion 39, the axis of the disconnector container 41 to be placed is Perpendicular to 1: By arranging it, the configuration space can be used effectively, so the overall length L2 is reduced. In addition, by arranging the outlet terminal portion 42 on the cable connection portion 39 side of the disconnector container 41 above the outlet terminal portion 43 on the other side of the instrument current transformer, the cable connection portion 39
A work space is secured during the lower six-key cable connection work.

〔Effect of the invention〕

As explained above, according to the present invention, by storing a plurality of devices in the same container, the configuration space can be effectively utilized and the entire device can be made smaller. In this case, it is possible to provide a gas-insulated switchgear that can reduce installation space and significantly reduce construction costs.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram showing an embodiment of the gas insulated switchgear according to the present invention 12, Fig. gi2 is a single line diagram of a substation, and Fig. 3 is a conventional gas insulated switchgear based on the single line diagram of Fig. 2. FIG. BU81, BUS2...Main bus D81. D82・
...Disconnector gs1. gs2...Working ground switch c'
r1. c'r2... Current transformer for instrument CB-... Breaker D83... Disconnector for line E83... Earthing switch for line DT,... Instrument transformer C1 (... Cable connection part 1 ... Breaker 2.3...-Output terminal section 4.5... Work earthing switch 6.7...
・Measurement current transformer 8...Line disconnector 9...Line grounding switch 10...Connection bus bar 11...
Cable connection part 12...Instrument transformer 13...
・Connection busbar 14.15...Disconnector 16.17
... Main bus bar 21 ... Breaker 22 ... Breaker container ... Breaker 24 ... Instrument current transformer 25.26 ... Work earthing switch 27.28
... Current-carrying conductor 29.30.31 ... Output terminal part
32, 33...Disconnector 34.35...Main bus bar
Ah... Instrument current transformer 37... Line disconnector
38...Line grounding switch 39...Cable connection section 40...Instrument transformer 41...Disconnector container 42.43...Exit terminal section agent Patent attorney Noriyoshi Chika Yudo Mitsumata Kobun Figure 1 Figure 2

Claims (2)

[Claims] (1) In a multi-bus type gas insulated switchgear that has instrument current transformers at both ends of the breaker, the first
, equipment such as a shield disconnector that can be freely connected and separated, a first instrument current transformer, and a work earthing switch are installed inside the shield disconnector container having second and third outlet terminals. A current-carrying conductor connected to one end of the shield disconnector is led out from the first and second outlet terminals via the first instrument current transformer, and The lead terminal portions are connected to the first and second main busbars through the first and second main bus disconnectors, respectively, and are connected to the current-carrying conductor connected to the other end of the disconnector. is led out from the third lead terminal part, and this third
A gas insulated switchgear having a configuration in which a second instrument current transformer is connected to the outlet terminal portion of the gas insulated switchgear. (2) The equipment connected between the second instrument current transformer and the external lead-out terminal such as a cable connection connected thereto shall be installed so that the axis of the container is perpendicular to the installation surface. The outlet terminal part on the side of the external drawer terminal part provided on the side surface of the container is arranged above the outlet terminal part on the second instrument current transformer side. Gas insulated switchgear described in ).