WO2004054057A1

WO2004054057A1 - Gas-insulated switch gear

Info

Publication number: WO2004054057A1
Application number: PCT/JP2002/013022
Authority: WO
Inventors: Tomotaka Yano; Masahiro Arioka
Original assignee: Mitsubishi Denki Kabushiki Kaisha
Priority date: 2002-12-12
Filing date: 2002-12-12
Publication date: 2004-06-24
Also published as: TW589774B; CN1623257A; TW200412003A; CN100474720C; JPWO2004054057A1

Abstract

A gas-insulated switch gear, wherein all of a breaker, a disconnect switch with an earth switch, and a bushing for bus- bar in an insulating gas-sealed tank are supportedly installed on a single flat plate-shaped mounting plate forming a part of the tank, the earth side terminal of the disconnect switch with the earth switch is installed on the mounting plate at a position below the bushing for bus-bar, and the breaker and the disconnect switch with earth switch are supported by a supportedly insulating tube supported on the mounting plate.

Description

Gas Insulated Switchgear Technical Field

The present invention relates to a gas insulated switch gear, and more particularly, to a gas insulated switch gear provided with a tank having a detachable mounting plate for sealing a front surface of a tank body. Akita

Background art

Conventional gas-insulated switch gears contain main circuit devices such as circuit breakers and disconnectors with earthing switches in a tank filled with insulating gas, and a busbar is provided in a through hole provided in the tank top wall above these main circuit devices. Pushing for connection was mounted through. The circuit breaker is mounted on the front wall of the tank, and the disconnector with a grounding switch is mounted on the bottom wall of the tank (see, for example, Japanese Patent Application Laid-Open Publication No. 2001-365262, Figures 1 and 2). ). In another conventional gas insulated switchgear, the tank is divided into two parts, the front and the back, and a part of the tank in the front half is used as a panel. Equipment is installed. (See, for example, Japanese Patent Application Laid-Open No. 8-306627) J.

Since the conventional switch gear is configured as described above, it is necessary to raise the worker on the top wall of the tank above the switch gear when connecting the bus, which is dangerous because it requires high-level work. Since the upper surface had to be able to withstand the weight of the busbar connection operator, the tank had to be reinforced, which was expensive. In addition, since the busbar bushing and the input terminal of the disconnector with earthing switch are mounted on different surfaces, there is a large positional error in the mounting holes, so that connection can be made even if a large error occurs. However, the connecting conductor had to be flexible and was expensive. Disclosure of the invention

According to the present invention, a circuit breaker and a disconnector with a grounding switch are arranged in a tank having a detachable mounting plate for sealing the front surface of the tank body, and a busbar bushing is provided through the tank wall of the tank. The gas insulated switch gear is characterized in that the circuit breaker, the disconnector with a ground switch and the bushing bushing are supported by a common single mounting plate. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a side sectional view showing an embodiment of a gas-insulated switch gear of the present invention. FIG. 2 is a view for explaining power detection of a bus portion by a ground terminal in the gas-insulated switch gear of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION

As shown in FIG. 1, a tank 2 is provided on a gantry 1 made of thin sheet metal. The front (left side in the figure) of the tank 2 has a notched shape. Tank 2 has a tank body 2b with an opening 2a formed in the tank wall on the front of the tank, and an attachment that forms a part of the tank wall by hermetically closing the opening 2a of the tank body 2b. Plate 3 is provided, and the inside of tank 2 is filled with insulating gas. The mounting plate 3 is a single flat plate substantially in the same plane. On the back side of the mounting plate 3, one side of a supporting insulating cylinder 4, which is a hollow insulating support made of a solid insulator, is attached so as to have a gap between the supporting insulating cylinder 4 and the main circuit portion of the vacuum circuit breaker 5. Inside of 4 are a vacuum switch tube (VST) 6 which is a circuit breaker, and a flexible conductor 9 for connecting the movable shaft 7 of the vacuum switch tube 6 to the disconnector blade support terminal 8 with a grounding switch. The main circuit part of the vacuum circuit breaker 5 is housed. Inside the support insulating tube 4, there is also provided an insulating port 1 that penetrates through the opening 3 a of the mounting plate 3 to insulate the movable shaft 7 of the vacuum switch pipe 6 from the circuit breaker operating section 10 and to mechanically connect it. 1. Also accommodates mechanical parts such as an adapter 12 for connecting the insulating port 11 to the movable shaft 7 of the vacuum switch tube 6. A disconnector 13 with a grounding switch is provided on the supporting insulating cylinder 4. In front of the mounting plate 3, a vacuum circuit breaker operation unit 10 and a disconnecting switch operation unit 15 with a grounding switch are provided. Let's do it.

On the side opposite to the mounting plate 3 of the supporting insulating cylinder 4, a fixed terminal 16 of the vacuum switch tube 6 is mounted via a fixing terminal 17, and a supporting protrusion 4a is formed from the supporting insulating cylinder 4 on the upper side. The input terminal 18 of the disconnecting switch 13 with a grounding switch protrudes upward, and a projection 4 b smaller than the support projection 4 a is provided above the movable switch tube shaft 7 of the support insulating cylinder 4. The blade support terminal 8 of the disconnector 13 with a grounding switch is attached to the protrusion 4b. An opening 20 is provided on the mounting plate 3 side of the small protruding portion 4 b so as to penetrate the supporting insulating cylinder 4, and the movable shaft 7 of the vacuum switch tube 6 passes through the opening 20. The flexible conductor 9 is connected to the blade support terminal 8 of the disconnector 13 with a ground switch. The ground terminal 29 of the disconnector 13 with a ground switch is mounted via a pushing 30 to a mounting plate provided on the front surface of the tank 2. Openings are formed below the supporting insulating cylinder 4 at the same pitch as the supporting insulating cylinder 4 for each phase in the cutouts at the lower part of the front surface of the tank 2, and serve as insulating members that airtightly close the opening. A cable connection bushing 25 is provided, and a power cable 27 is connected via a cable terminal 26.

The mounting plate 3 on the front face of the tank 2 has the same pitch as the supporting insulating cylinder 4 for each phase and the outer diameter of the busbar 21 at a position above the operation parts 10 and 15 and the ground terminal 29. An opening 3b is formed at a position slightly shifted from the size in the vertical direction, and a busbar bushing 22 is provided as an insulating member for hermetically closing the opening 3b. The inner conductor 22 a is embedded in the center of the bushing 2 2 so as to penetrate the bushing 22, and a conductor can be connected to both sides of the inner conductor 22 a (for example, screw processing). One side is connected to the input terminal 18 of the disconnector with a ground switch via the connection conductor 31, and the other side is connected to the solid insulated bus 21. Before attaching the mounting plate 3 to the tank body 2b together with the vacuum circuit breaker 5 and the disconnector 13 with the earthing switch, etc., attach the busbar bushing 2 2 to the opening 3b of the mounting plate 3, After connecting the bushing bushing 2 2 and the input terminal 18 of the disconnector 13 with the earth switch with the connection conductor 31 1, the mounting plate 3 is airtightly mounted to the tank body 2 b. Also

When the solid insulated bus 21 is connected, connect the solid insulated bus 21 to the bushing pushing 22 from the front of the switchgear, and if necessary, cover the solid insulated bus 21 and the surroundings. Attach one three two.

In this embodiment of the gas insulated switchgear, a circuit breaker 6 and a disconnector 13 with a ground switch are arranged in a tank 2 having a detachable mounting plate 3 for sealing the front surface of a tank body 2b. The busbar bushing 2 2 is provided so as to penetrate the tank wall of the tank 2, and the circuit breaker 6, disconnector 13 with earthing switch and busbar bushing 2 2 are all in substantially the same plane It is flat and supported by a single common mounting plate 3. In addition, the ground terminal 29 of the disconnector 13 with the ground switch is supported through the mounting plate 3 below the bushing bushing. Furthermore, the circuit breaker 6 and the disconnecting switch 13 with a grounding switch are supported by an insulating support 4 supported on the mounting plate 3, and the bushing bushing 22 is connected to the ground terminal of the disconnecting switch 13 with a grounding switch. It is provided on the mounting plate 3 at a position above 29.

According to such a gas insulated switchgear, since the bushing bushing 22 and the disconnector 13 with the earthing switch are mounted on the same mounting plate 3, the openings 3a and 3a for connecting each other are provided. The error of the hole position of 3b is small, and there is no need to perform special processing on the connection conductor 31 and there is no need to use an expensive flexible conductor as the connection conductor 31, so that the cost is reduced. In addition, since the connection work of the connection conductor 31 is completed outside the tank 2, the workability is good, the confirmation of the fastening is easy, the work time can be shortened, and the quality can be improved. Furthermore, since the bushing bushing 2 2 is attached to the mounting plate 3 on the front of the tank 2, there is no need to work on the top wall of the tank 2. The weight can be reduced.

Also, by providing the busbar bushing 22 near the grounding terminal 29 of the disconnecting switch with grounding switch 13 insulated and mounted, the grounding terminal 29 and the grounding terminal 29 when the grounding terminal 29 is disconnected from the ground potential are grounded. The ratio of the capacitance C2 between the grounding terminal 29 and the bushing 22 for the bus to the capacitance C1 between the busbar and the bushing 22 increases, and the grounding terminal 29 detects the power of the bus 21. Becomes possible. The voltage V of the ground terminal section 29 can be obtained from the following equation shown in FIG.

V = (C 2 / (C 1 + C 2)) X V O

Claims

The scope of the claims

1. Gas insulation in which a circuit breaker and a disconnector with a grounding switch are placed in a tank with a removable mounting plate that seals the front of the tank body, and busbar bushings are provided through the tank wall of the tank. In switchgear,

A gas insulated switchgear wherein the circuit breaker, the disconnector with a ground switch, and the busbar bushing are supported by a single common mounting plate.

2. The gas-insulated switch gear according to claim 1, wherein the mounting plate is a flat plate that is substantially in the same plane.

3. The gas-insulated switch according to claim 1, wherein a ground-side terminal supported through the tank wall is provided below the bushing bushing.

4. The circuit breaker is supported by an insulating support supported by the mounting plate, the disconnecting switch with a ground switch is supported by the insulating support, and the bushing for the busbar is connected to the ground switch. 2. The gas-insulated switch gear according to claim 1, wherein the gas-insulated switch gear is provided above the ground-side terminal of the disconnecting switch.