JPH10229616A - Gas insulation switching device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To relieve the electric field of an electrode at the time of separation for minimizing the displacement to operate a lightning arrester by connecting a current collector on body side at a shield inside, using a shield whose curvature is large at the top of the lightning arrester. SOLUTION: A disconnect part is formed between a lightning arrester 11 and a high-voltage conductor 4b for separating the lightning arrester 11 from the high-voltage conductor 4b so as to apply no voltage to the lightning arrester 11 at the time of withstand voltage insulation test for a gas insulation switching device. A current collector 7d on body side is connected, using the shield 13 whose curvature is large, at the inside of the shield 13 so as to minimize the displacement of the disconnect part. It is thus possible to relieve the electric field of an electrode at the time of separation for minimizing the displacement to operate the lightning arrester 11, and simplify the inside of a sealing container filled with insulating gas for size reduction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a gas-insulated switchgear.

[0002]

2. Description of the Related Art FIG. 3 shows a conventional structure. That is, the high-voltage conductor 4b and the lightning arrester 11 are connected via the current collector 7d, and the shield 13 is provided to alleviate the electric field. However, since the radius of curvature of the current collector 7d is small, this part is cut off during the withstand voltage insulation test. Was.

The lightning arrester 11 is connected to the high voltage conductor 4b via a current collector 7d, and the high voltage conductor 4b is connected to the main body via the movable element 6b of the lightning arrester disconnector 5b. With this structure, the surge arrester 1
By operating the disconnecting section operating device 5b provided between the lightning arrester 11 and the high-voltage conductor 4b to separate 1 from the high-voltage conductor 4b, the movable element 6b of the disconnector moves to the right in the drawing and moves between the poles. Form. Therefore, it is necessary to ensure a sufficient insulation gap between the poles formed by the fixed-side current collector 7c and the high-voltage conductor 4c, which causes an increase in the lateral dimension of the gas-insulated switchgear. In this structure, the number of parts for separation is large, and a large number of conductor supporting post spacers 15 and the like are required, so that the inside of the sealed container is considerably complicated.

[0004] Separately, a handhole (not shown) is provided in the sheath 1 at a position where the current collector 7c can be viewed silently.
1 may be separated from the high voltage side conductor 4b. In the above method, before the high-voltage side conductor 4b is removed, the insulating gas filled in the sheath 1 is recovered, the handhole cover is removed, and the high-voltage side conductor 4b is removed from the handhole. After this work, attach the handhole cover,
The insulating gas is filled in the sheath 1, and a withstand voltage test of the gas insulated switchgear is performed. FIG. 4 shows a detailed view of the “on” and “off” states of the high-voltage side conductor and the lightning arrester.

Japanese Patent Application Laid-Open No. 60-183908 and Japanese Patent Application Laid-Open No.
No. 3519, and the like.

[0006]

In the prior art, the structure of the gas insulated switchgear is complicated, and the operating mechanism of the disconnecting portion formed between the high-voltage conductor and the lightning arrester is provided in the gas. Occupied a large area within. Also, if the lightning arrester is to be separated from the high-voltage conductor 4b with the conventional technology, the radius of curvature of the current collector is small, which causes a problem in the electric field. Therefore, it is necessary to increase the displacement, and the size of the gas insulated switchgear is reduced. There is a limit to conversion.

[0007]

In order to achieve the above-mentioned object, the present invention provides a lightning arrester disconnection structure, and by operating the lightning arrester itself, a displacement amount of a disconnection portion formed between the high-voltage conductor and the lightning arrester can be reduced. As described above, by using a shield having a large curvature above the lightning arrester and connecting the current collector on the main body side inside the shield, the electric field of the electrode at the time of disconnection is alleviated, and the displacement amount for operating the lightning arrester is minimized. This structure is provided on the aerial side below the lightning arrester to simplify the inside of the tank.

[0008] Further, by using a structure in which an operation portion of a disconnecting portion formed between the high-voltage conductor and the lightning arrester is provided in the air and operating the lightning arrester itself, the inside of the sealed container filled with the insulating gas is simplified and reduced. Is going to be transformed.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.

In FIG. 1, a sealed container 1 filled with an insulating gas is composed of a tube arranged so that its axis is oriented vertically, and the sealed container 1 is provided with openings in the vertical and left directions. The opening 2a is airtightly connected to the insulating spacer 3, and the openings 2b and 2c are airtightly closed by a flat plate.
The spacer 3 is provided with a three-phase buried conductor, to which the high-voltage conductor 4a is connected. A line-side disconnector 5 is provided at the upper left of the closed container 1 and is connected via a connecting mechanism by an operating device attached to the outside of the closed container, whereby the three-phase disconnectors are operated collectively by the operating mechanism. , Mover 6
Moves up and down to form a gap with the current collector 7. A conductor 4 b is arranged below the current collector 7 and connected to the cable head 8. A grounding switchgear 9 is provided at the upper right of the sealed container 1, and the three-phase grounding switchgear operates collectively by an operation mechanism like the disconnector, and the mover 10 moves left and right.
A high-voltage conductor 4b is arranged on the left side of the current collector 7b.
A gap is formed between b and the high voltage conductor. Furthermore, current collector 7b
The lightning arrester 11 and the high-voltage-side conductor 4b are connected via a current collector 7b. Opening 2C is bottom plate 1
6, six holes are formed to penetrate the bottom plate 12 and connect the three-phase lightning arrester 11 and the cable head 8, and the lightning arrester 11 is closed so that the holes are airtightly closed.
And the cable head 8 are connected respectively.

In the present embodiment, an operating device is provided on the air side below the lightning arrester 11, and the lightning arrester mechanism 14 is connected to the lightning arrester 11 itself, so that the lightning arrester 11 moves. Can be simplified. Also, as shown in FIG.
By using the collector 7d on the high voltage side inside, the insulation performance of the high voltage conductor 4b and the lightning arrester 11 is improved by increasing the radius of curvature of the shield, and the electric field can be reduced as compared with the conventional type. Of the lightning arrester 11 can be reduced. With the above-described structure, the cost can be reduced by lowering the thickness of the sealed container 1 and simplifying the shape of the conductor 6.

[0012]

The present invention has the following excellent effects.

[0013] By connecting the current collector inside the lightning arrester shield, the displacement of separating the lightning arrester from the high-voltage conductor can be reduced when a withstand voltage test of the gas insulated switchgear is performed.

By providing the mechanism in the air below the surge arrester, simplification and downsizing of the closed container filled with the insulating gas can be realized.

[0015] It is possible to reduce the number of layers and cost of the gas insulated switchgear.

[Brief description of the drawings]

FIG. 1 is an internal explanatory view showing an embodiment of the present invention.

FIG. 2 is an explanatory view of the open / close state of the upper part of the lightning arrester of the present invention.

FIG. 3 is an explanatory view of the inside of a line unit having a conventional structure.

FIG. 4 is an explanatory view of an open / closed state of an upper portion of a conventional lightning arrester.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... sheath, 2 ... opening, 3 ... spacer, 4 ... conductor, 5
… Track-side disconnector, 6… disconnector mover, 7… current collector, 8…
Cable head, 9 grounding switchgear, 10 grounding armature, 11 arrester, 12 bottom plate, 13 arrester shield, 14 arrester mechanism, 15 post spacer.

Claims (2)

[Claims] 1. A three-phase batch gas insulated switchgear having a high-voltage conductor, a disconnector, a ground switch, a power cable arrester and a transformer housed in a sealed container filled with an insulating gas. At the time of the withstand voltage insulation test, a disconnection part is provided between the lightning arrester and the high-voltage conductor to separate the lightning arrester from the high-voltage conductor so that no voltage is applied to the lightning arrester, and the disconnection part is provided below the lightning arrester. A gas-insulated switchgear, wherein a current collector on a main body side is arranged inside a shield on the lightning arrester side in a mechanism provided with an operating section for operating the lightning arrester. 2. The gas insulated switchgear according to claim 1, wherein the operating portion of the disconnecting portion located between the high-voltage conductor portion and the lightning arrester is provided outside the closed vessel.