JP2019054638A - Grounding switch/arrester unit and gas insulated switchgear - Google Patents

Abstract

To miniaturize a gas insulated switchgear to reduce assembly processes when an arrester is incorporated into the gas insulated switchgear.SOLUTION: A grounding switch/arrester unit 9 is constituted by aligning a grounding switch 6 and an arrester 7 on a mounting plate 8 to be arranged. A support insulator 16 is provided between the grounding switch 6 and the arrester 7 to support the arrester 7 to the grounding switch 6 via the support insulator 16. An upper end of the support insulator 16 is fixed to a frame 6b of the grounding switch 6 via a metal fitting 15 with a U-shaped cross-section, and a lower end of the support insulator 16 is fixed to a metal fitting 17 provided in an electrode 7b of the arrester 7. The mounting plate 8 of the grounding switch/arrester unit 9 is mounted on an equipment tank 10 to incorporate the grounding switch 6 and the arrester 7 into the gas insulated switchgear 1.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gas insulated switchgear. In particular, the present invention relates to a ground switch and a lightning arrester mounting structure provided in a gas insulated switchgear.

  As shown in FIG. 4, the cubicle type gas insulated switchgear 18 (C-GIS: Cubicle Gas Insulated Switchgear, hereinafter referred to as gas insulated switchgear) includes a vacuum circuit breaker 27, a disconnect switch 26, a ground switch 28, and the like. The equipment is collectively stored in a tank (for example, equipment tank 10) that is grounded and filled with low-pressure insulating gas.

  As shown in FIG. 5, the earthing switch 28 (ES) and the lightning arrester 29 (LA) arranged in the gas insulated switchgear 18 are arranged on a single mounting plate 30 and unitized. When the lightning arrester 29 is incorporated in the gas insulated switchgear 18, the mounting plate 30 in which the grounding switch 28 and the lightning arrester 29 are unitized is attached to the equipment tank 10, and the grounding switch 28 and the lightning arrester 29 are provided in the equipment tank 10. An insulator 31 is provided at the bottom of the device tank 10. By this insulator 31, the lightning arrester 29 provided in the equipment tank 10 is supported. When incorporating the lightning arrester 29 into the equipment tank 10, the lightning arrester 29 is fastened to the upper end of the insulator 31.

JP 2000-032620 A

  When the arrester is supported by an insulator provided at the bottom of the tank, it is necessary to fasten the insulator and the arrester inside the tank when assembling the gas insulated switchgear. As a result, an assembling process and an assembling time when the arrester is incorporated into the gas insulated switchgear are increased. Further, if the lightning arrester is supported on the bottom of the tank through the insulator, the distance between the lightning arrester and the tank bottom becomes long, and the gas insulated switchgear may be increased in size.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a technique for reducing the assembly process when a gas insulated switchgear is miniaturized and a lightning arrester is incorporated in the gas insulated switchgear.

One aspect of the earthing switch / lightning arrester unit of the present invention that achieves the above object is as follows:
A grounding switch, a lightning arrester, a mounting plate on which the grounding switch and the lightning arrester are juxtaposed, and an insulating support member provided between the grounding switch and the lightning arrester,
The lightning arrester is supported by the ground switch through the support member.

Another aspect of the grounding switch / lightning arrester unit of the present invention that achieves the above object is the grounding switch / lightning arrester unit,
A metal fitting is provided at the lower end of the frame of the ground switch,
One end of the support member is fixed to the metal fitting, and the other end of the support member is fixed to an electrode of the lightning arrester.

In addition, one aspect of the gas insulated switchgear of the present invention that achieves the above object is as follows:
The ground switch / lightning arrester unit is provided in a device tank filled with an insulating gas.

  According to the above invention, a gas insulated switchgear can be reduced in size and the assembly process at the time of incorporating a lightning arrester in a gas insulated switchgear can be reduced.

It is a figure which shows an example of a structure of the gas insulated switchgear which concerns on embodiment of this invention. It is a principal part enlarged view of the gas insulated switchgear which concerns on embodiment of this invention. It is a top view of a ground switch / lightning arrester unit. It is sectional drawing of the power receiving unit of the gas insulated switchgear concerning a prior art. It is a principal part enlarged view of the gas insulated switchgear concerning a prior art.

  A ground switch / lightning arrester unit and a gas insulated switchgear according to an embodiment of the present invention will be described in detail with reference to the drawings.

  As shown in FIG. 1, a gas-insulated switchgear 1 according to an embodiment of the present invention includes a power receiving unit 2, a transformer primary unit 4 for connection to a transformer 3, and an instrumental current transformer (VCT). VCT unit 5 containing

  As shown in FIG. 2, the power receiving unit 2 includes a ground switch 6 (ES) and a lightning arrester 7 (LA). The earthing switch 6 and the lightning arrester 7 are arranged on the mounting plate 8 side by side in the vertical direction to form an integrated earthing switch / lightning arrester unit 9. A mounting plate 8 constituting the earthing switch / lightning arrester unit 9 is detachably attached to the equipment tank 10 with bolts or the like, and the earthing switch 6 is connected to the gas insulated switchgear 1 (specifically, the power receiving unit 2). A lightning arrester 7 is incorporated.

  The ground switch 6 includes a main shaft 6a (not shown in FIG. 2) provided to be detachable from an ES contact 12 provided on the main circuit conductor 11. The main shaft 6 a of the ground switch 6 is connected (or separated) to the ES contact 12 by an operation mechanism 13 provided outside the equipment tank 10. The ground switch 6 includes a frame 6b, and the main shaft 6a and the like are supported by the frame 6. The frame 6b is fixed to the mounting plate 8.

  The lightning arrester 7 includes, for example, a zinc oxide (ZnO) element 7c between a ground terminal 7a and an electrode 7b. The ground terminal 7 a is provided outside the equipment tank 10. The electrode 7b is disposed in the device tank 10 so as to face the main circuit conductor 11, and is connected to the main circuit conductor 11 via the connection conductor 7d. One end of the connection conductor 7d is provided with an insulating operation rod 7e for moving the connection conductor 7d in the axial direction, and the other end of the connection conductor 7d is connected to and disconnected from the contact connection portion 14 provided on the main circuit conductor 11. It is possible.

  A bracket 15 having a U-shaped cross section is attached to the lower end of the frame 6b of the ground switch 6. As shown in FIG. 3, the metal fitting 15 is provided across the frame 6b. The metal fitting 15 has a U-shaped cross section in the direction perpendicular to the span between the frames 6b (in the direction of arrow A in the figure). The metal fitting 15 is provided between the frames 6b so that the opening having a U-shaped cross section faces upward. The metal fitting 15 includes a pair of frame fixing portions 15a fixed to the frame 6b and a lever fixing portion 15b on which the support lever 16 is provided. The frame fixing portions 15a are respectively provided at end portions in the bridging direction between the frames 6b, and are fixed to the frame 6b with bolts or the like. As shown in FIG. 2, the upper end portion of the support insulator 16 is fixed to the insulator fixing portion 15 b, and the electrode 7 b of the lightning arrester 7 is fixed to the lower end portion of the support insulator 16 via the metal fitting 17. In this way, the electrode 7b of the lightning arrester 7 is fixed (supported) to the frame 6b of the ground switch 6.

  Although not shown in the drawing, the power receiving unit 2 is connected to the equipment tank 10 that is grounded and filled with the low-pressure insulating gas, as in the power receiving unit of the gas insulated switchgear 18 according to the prior art shown in FIG. A tank 19 is configured to be accommodated in a housing 20. The bus tank 19 is provided with bus bars 21 for three phases. The bus 21 is led into the equipment tank 10 through the disconnector 22 (DS) and the main circuit conductor 23. Further, the device tank 10 is provided with a main circuit conductor 11 and a vacuum circuit breaker 27 to which a cable 25 provided in a cable storage unit 24 provided adjacent to the device tank 10 is connected.

  According to the ground switch / lightning arrester unit 9 and the gas-insulated switchgear 1 according to the embodiment of the present invention as described above, the mounting plate 8 includes the ground switch 6 and the lightning arrester 7 and projects to the inside of the equipment tank 10. By supporting the lightning arrester 7 on the grounding switch 6 via the support insulator 16, a unit in which the grounding switch 6 and the lightning arrester 7 are integrated can be configured. As a result, the insulator provided between the lightning arrester and the bottom of the equipment tank becomes unnecessary, and the work of connecting the insulator and the lightning arrester in the equipment tank becomes unnecessary.

  That is, by combining the earthing switch 6 and the lightning arrester 7 as a unit, when the earthing switch 6 and the lightning arrester 7 are incorporated into the gas insulated switchgear 1, the earthing switch / lightning arrester unit 9 Work for fastening the gas insulated switchgear 1 main body (for example, connection of the insulator 31 and the lightning arrester 29 provided at the bottom of the equipment tank 10 in the conventional gas insulated switchgear 18 as shown in FIG. 5) It becomes unnecessary. Therefore, the assembly process at the time of incorporating the lightning arrester 7 in the gas insulated switchgear 1 is reduced, and the assembly time of the gas insulated switchgear 1 is shortened.

  Moreover, the height of the gas insulated switchgear 1 (C-GIS) can be reduced by the height of the insulator by eliminating the need for the insulator provided between the lightning arrester and the equipment tank bottom. The whole can be reduced. That is, since the distance between the lightning arrester 7 and the bottom surface of the equipment tank 10 can be shortened to a distance necessary to maintain the withstand voltage between the main circuit conductor 11 and the bottom face of the equipment tank 10, the gas insulated switchgear The height of 1 can be reduced.

  Further, by unitizing the earthing switch 6 and the lightning arrester 7, it becomes possible to assemble the earthing switch / lightning arrester unit 9 in advance outside the gas-insulated switchgear 1 in advance, and the assembly efficiency of the gas-insulated switchgear 1 is improved. To do.

  Further, by making the shape of the metal fitting 15 fixed to the frame 6b of the ground switch 6 into a U-shaped cross section, the strength of the frame 6b formed of a relatively thin plate is improved, and the distortion of the frame 6b (for example, the frame 6b) It is possible to suppress distortion such as the direction in which the metal fitting 15 of 6b is bridged (in the direction of arrow B in FIG. 3).

  The ground switch / lightning arrester unit and gas insulated switchgear according to the present invention have been described with reference to specific embodiments. However, the ground switch / lightning arrester unit and gas insulated switchgear according to the present invention are limited to the embodiments. However, the design can be changed as appropriate without departing from the characteristics thereof, and the design change also belongs to the technical scope of the present invention.

  For example, the lightning arrester can be configured to be supported by a grounding switch part of a disconnecting switch with an earthing switch (EDS) as shown in FIG.

  Further, the support member for supporting the lightning arrester on the ground switch is not limited to the insulator, and an insulating support member having a strength capable of supporting the lightning arrester can be used as appropriate.

DESCRIPTION OF SYMBOLS 1 ... Gas insulation switchgear 2 ... Power receiving unit 3 ... Transformer 4 ... Transformer primary unit 5 ... VCT unit 6 ... Ground switch 6a ... Main shaft, 6b ... Frame 7 ... Lightning arrester 8 ... Mounting plate 9 ... Ground switch / lightning arrester Unit 10 ... Equipment tank 11 ... Main circuit conductor 12 ... ES contact 14 ... Contact connection 15 ... Metal fitting 15a ... Frame fixing part, 15b ... Insulator fixing part 16 ... Supporting insulator (supporting member)
17 ... metal fittings

Claims (3)

A grounding switch, a lightning arrester, a mounting plate on which the grounding switch and the lightning arrester are juxtaposed, and an insulating support member provided between the grounding switch and the lightning arrester,
A ground switch / lightning arrester unit, wherein the lightning arrester is supported by the ground switch via the support member. A metal fitting is provided at the lower end of the frame of the ground switch,
The ground switch / lightning arrester unit according to claim 1, wherein one end of the support member is fixed to the metal fitting, and the other end of the support member is fixed to an electrode of the lightning arrester.   A gas insulated switchgear characterized in that the earthing switch / lightning arrester unit according to claim 1 or 2 is provided in a device tank filled with an insulating gas.

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