JPH03139107A - Gas-insulated switchgear - Google Patents

Abstract

PURPOSE:To simplify a line side equipment and to reduce the number of parts by connecting a voltage transformer and a lightning arrester so that they can be connected through one disconnecting movable electrode and fixed electrode. CONSTITUTION:While one lead terminal 13 of a line side equipment 10 is connected with the lead terminal 9 of a breaker container 1 and one disconnector 31 is connected with the other lead terminal 18, a voltage transformer 22 is arranged in the vertically upper end part of the disconnector 31 and a ligthning arrester 30 is arranged in the lower end part and they are connected by the movable electrode 36 and fixed electrode 37 of the disconnector 31 so as to enable connection and disconnection. Therefore, the voltage transformer 22 and lightning arrester 30 can be separated from a main circuit by the disconnector 31 composed of one movable electrode 36 and fixed electrode 37 at the time of the voltage test of a power cable. Thus, it is possible to simplify the line side equipment 10 and to reduce the number of parts.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates to a gas insulated switchgear that is installed in a substation or the like and has an improved arrangement of electrical equipment connected to a power transmission line.

(Conventional technology) In substations and switchyards installed around major cities and coastal areas, electrical equipment constituting the substations and switchyards is heated using SF6 gas, etc. due to difficulties in obtaining land and measures to prevent salt damage. Gas-insulated switchgear sealed with an insulating medium that has excellent insulation and arc-extinguishing properties is used. This type of gas insulated switchgear is designed to house a plurality of electrical devices in one container with shortened mutual insulation distances, thereby significantly reducing the overall size.

FIG. 2 shows a single line diagram of each electric device constituting a conventional gas insulated switchgear. In Figure 2, G
CB is a breaker, and one end of this breaker GCB is connected to the main bus B1 via the main bus disconnector DSI, and is also connected to the main bus B2 via the main bus disconnector DS2,
The other end of the breaker GCB is connected to the cable head CH via a line disconnector DS3. Work earthing switches ESI and E are installed at both ends of this breaker GCB.
Each can be grounded via S2. moreover,
A potential transformer PT is connected to the line connecting the line disconnector DS3 and the cable head CH via a transformer disconnector DS4, and is also connected to a lightning arrester LA via a new line switch for a lightning arrester DS5.

FIG. 3 shows a layout diagram of each electrical device of a gas insulated switchgear having such a connection configuration.

That is, as shown in FIG. 3, a breaker container 1 installed vertically on a base has a fixed electrode 2 and a movable electrode 3 in parallel with the axial direction of the breaker container 1, which corresponds to each of the three phases. Section 4 is stored. Further, the breaker container 1 has lead terminal parts 5 and 6 formed in the vertical direction on its side surface and electrically connected to the movable side electrode 3, and the main bus disconnector 7 and the lead terminal parts 5 and 6 are formed in the vertical direction. 8 are connected to each other.

Furthermore, one outlet terminal portion 9 electrically connected to the fixed side electrode 2 is formed on the side surface of the breaker container 1 opposite to the outlet terminal portions 5 and 6.

On the other hand, the track side equipment 10 is vertically installed on the base adjacent to the breaker container 1, and the breaker container 1 is connected to. This track side equipment 1
0, a current-carrying conductor 11 is arranged in the vertical direction, and a cable cone 12 connected to a power cable is connected below the current-carrying conductor 11.

Further, an output terminal portion 13 is formed on the side surface of the track side equipment 10 facing the output terminal portion 9, and this output terminal portion 1
3 is an insulating spacer that horizontally supports a movable disconnecting electrode 14 connected to the current-carrying conductor 11 and a fixed disconnecting electrode 15 that connects and separates. has been done. Further, two lead terminal parts 17 and 18 are formed in the vertical direction on the side surface of the track side equipment 10 opposite to the lead terminal part 13, and the lead terminal part 17 above the lead terminal part 17 is connected to the current-carrying conductor 11. An instrument transformer 22 is connected to the movable electrode 19 via an insulating spacer 21 that horizontally supports a fixed electrode 20 that comes into contact with and separates from the movable electrode 19 . In addition, the lower lead terminal portion 18 of the track side equipment 10
A conductor 23 led out horizontally from the current-carrying conductor 11 is connected to a disconnector 25 via an insulating spacer 24. In this disconnector 25, a movable electrode 26 is vertically movably connected to a conductor 23 introduced through an insulating spacer 24, and is brought into contact with and separated from the movable electrode 26 by an outlet terminal portion 27 formed at its lower end. The fixed electrode 28 is connected to a lightning arrester 30 vertically installed on the base via an insulating spacer 29 that supports the fixed electrode 28 .

By the way, in a gas insulated switchgear having such a configuration, a withstand voltage test may be conducted to verify the power cable. In this case, in order to avoid the application of test voltage, the voltage transformer 22 and the lightning arrester 30 have one movable electrode and a fixed electrode 20 at the disconnection section provided in the connection device 10 and a disconnector 25 connected to the connection device 10. movable electrode 2
6 and the fixed electrode 28 are separated from each other.

(Problem to be Solved by the Invention) However, in this way, in order to disconnect the voltage transformer 22 and the lightning arrester 30 when conducting a withstanding voltage test, it is difficult to provide a new path in the connected device 10 or disconnect the connected device 10. Connecting the device 25 poses a problem in terms of miniaturizing the entire device, and also poses a problem in terms of reliability as the number of parts increases.

An object of the present invention is to provide a gas insulated switchgear which is small in size as a whole and is highly reliable and inexpensive.

[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above-mentioned object, the present invention vertically arranges a shut-off container housing a shut-off part in parallel with the axial direction. An outlet terminal section is provided on the surface, the main bus is connected to one outlet terminal section via a main bus disconnect switch, and the track side equipment placed adjacent to the breaker container is connected to the other outlet terminal section. In the gas insulated switchgear, outlet terminal portions are provided on both sides of the front wiring road side equipment, one outlet terminal portion is connected to the other outlet terminal portion of the breaker container, and one disconnection is connected to the other outlet terminal portion. A voltage transformer is installed at the upper end of the disconnector in the vertical direction, a lightning arrester is installed at the lower end of the disconnector, and the disconnector is connected to the disconnector so that it can be connected to the movable electrode and fixed electrode. It is.

(Function) In the gas-insulated switchgear with this configuration, it is possible to connect and disconnect the instrument transformer and lightning arrester using one movable electrode for the new road and a fixed electrode, which simplifies the line-side equipment. It is possible to improve reliability by reducing the number of parts.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of the configuration of a gas insulated switchgear according to the present invention, and the same parts as in FIG. 3 are shown with the same symbols.

As shown in FIG. 1, a breaker container 1 installed vertically on a base has a fixed electrode 2 and a movable electrode 3 in parallel with the axial direction of the breaker container 1, and a breaker portion 4 corresponding to each of the three phases.
is stored. In addition, lead terminal parts 5 and 6 electrically connected to the movable side electrode 3 are formed in the vertical direction on the side surface of the breaker container 1, and main bus disconnectors 7 and 8 are connected to these lead terminal parts 56, respectively. It is connected. Furthermore, one outlet terminal portion 9 connected to the fixed side electrode 2 is formed on the side surface of the breaker container 1 opposite to the outlet terminal portion 5 6 .

On the other hand, the track side equipment 10 is vertically installed on the base adjacent to the breaker container 1, and the breaker container 1 is connected to. This track side equipment 1
0, a current-carrying conductor 11 is arranged in the vertical direction, and a cable cone 12 connected to a power cable is connected below the current-carrying conductor 11.

Further, an output terminal portion 13 is formed on the side surface of the track side equipment 10 facing the output terminal portion 9, and this output terminal portion 1
3 is connected to the outlet terminal portion 9 on the breaker container 1 side through an insulating spacer 16 that horizontally supports a movable disconnecting electrode 14 connected to the current-carrying conductor 11 and a fixed disconnecting electrode 15 that connects and separates. ing. Furthermore, one outlet terminal part 18 is formed on the side surface of the line side equipment 10 opposite to the outlet terminal part 13, and a disconnector container 31 is connected to this outlet terminal part]8.

This disconnector container 31 has outlet terminal portions 33 on its upper and lower surfaces.
．． 34, and the output terminal portion 18 of the connecting device 10.
An outlet terminal portion 35 is formed on the side surface corresponding to the
Inside thereof, a current-carrying conductor 32 is vertically arranged. The outlet terminal portion 3 on the top surface of such a disconnector container 31
An instrument transformer 22 is attached to 3 and electrically connected to the current-carrying conductor 32 thereof. Further, a lightning arrester 30 installed vertically on the base is attached to the outlet terminal portion 34 on the lower surface of the disconnector container 31, and is electrically connected to the current-carrying conductor 32 thereof. Furthermore, a movable disconnecting electrode 36 is electrically connected to the current-carrying conductor 32 in the disconnecting switch container 31 and is mounted so as to be movable in the horizontal direction. Furthermore, an insulating spacer 38 supporting a fixed electrode 37 that comes into contact with and separates from the movable electrode 36 is installed between the outlet terminal portion 18 of the connecting device 10 and the outlet terminal portion 35 of the disconnector container 31. A fixed electrode 37 on the side of the disconnector container 22 is attached to the horizontally provided conductor 23.
is connected.

If the gas insulated switchgear has such a configuration, only one movable electrode 36 and one fixed electrode 37 will be used during the voltage resistance test of the power cable.
Since it is possible to disconnect the voltage transformer 22 and the lightning arrester 30 from the main circuit by the disconnection section consisting of The number of parts can be reduced compared to the conventional case, and reliability can be improved.

In addition, although the above embodiment describes the case where it is applied to a three-phase and three-phase bus type gas insulated switchgear, it can also be applied to a single phase and single phase bus type gas insulated switchgear in the same manner as described above. .

[Effects of the Invention] As described above, according to the present invention, it is possible to connect and separate the voltage transformer and the lightning arrester using one movable disconnecting electrode and a fixed electrode, thereby simplifying the line side equipment. It is possible to provide a gas insulated switchgear that can reduce the number of parts and thereby reduce the size of the entire device and improve its reliability.

[Brief explanation of the drawing]

Fig. 1 is a configuration diagram of an embodiment of a gas insulated switchgear according to the present invention, Fig. 2 is a circuit diagram showing the connection configuration of a conventional gas insulated switchgear using a single wire, and Fig. 3 is a circuit diagram of a conventional gas insulated switchgear. FIG. 2 is a configuration diagram showing the device. 1... Breaker container, 2... Fixed ff1lJ electrode,
3... Movable side electrode, 4... Breaking part, 5, 6, 9,
13,1827.33.34.35... Output terminal section, 10... Track side equipment, 11.32... Current-carrying conductor,
12... Cable cone, 14.36... Movable electrode, 15°37... Fixed electrode, 16.38... Insulating spacer, 22... Instrument transformer, 23... Conductor, 3
0...Lightning arrester, 31...Disconnector container.

Claims (1)

[Claims] A breaker container containing a breaker section parallel to the axial direction is arranged vertically, outlet terminals are provided on both sides of this breaker container, and a main bus is connected to one of the outlet terminals via a main bus disconnector. , in a gas-insulated switchgear in which a line side device arranged adjacent to a cutoff container is connected to the other outlet terminal portion, outlet terminal portions are provided on both sides of the line side device, and one outlet terminal portion is connected to the line side device. A disconnector is connected to the other outlet terminal of the breaker container, and a disconnector is connected to the other outlet terminal of the track side equipment, and an instrument transformer is disposed at the upper end of the disconnector in the vertical direction. A gas insulated switchgear, characterized in that a lightning arrester is disposed at the lower end and is removably connected by a movable electrode and a fixed electrode of the disconnector.