JPH079533Y2 - Switchgear - Google Patents

Description

[Detailed Description of the Invention] "Industrial application field" The present invention relates to a switchgear represented by a cubicle type switchgear in which a plurality of devices are housed together in a metal container, and in particular, the structure of a lightning arrester and a ground switch. Regarding

"Prior Art" Generally, a cubicle type switchgear or a switchgear such as a reduced type GIS (hereinafter referred to as a cubicle type switchgear) is a device such as a circuit breaker, a disconnector, a lightning arrester, or a ground switch in a metal container of ground potential. Are stored in a batch. Among the above devices, the lightning arrester is a device that discharges an abnormal voltage such as a lightning surge to protect the entire device. Therefore, when carrying out the withstand voltage test of the cubicle type switchgear, the test voltage cannot be applied as a matter of course, so it is necessary to disconnect this lightning arrester from the main circuit conductor. For this reason, the lightning arrester is usually provided with a disconnecting portion, and the disconnecting portion is configured to connect to or disconnect from the main circuit conductor.

On the other hand, at the time of maintenance and inspection of the power transmission line or the cubicle type switchgear, it is necessary to ground the main circuit conductor in order to safely perform the work, and therefore a grounding switch is provided.

[Problems to be Solved by the Invention] Conventionally, the disconnecting part of the lightning arrester and the grounding switch have been individually provided. Therefore, a large space is required to store these in a metal container, and there is a drawback that the entire apparatus becomes large. In addition, an operating mechanism for connecting and disconnecting the disconnecting part of the arrester to the main circuit conductor and an operating mechanism for the grounding switch must be separately provided,
There is a drawback that it becomes expensive in terms of price.

"Means for solving the problem" The present invention requires that the lightning arrester is functionally connected to the main circuit conductor when the earthing switch is closed at the time of maintenance and inspection of the transmission line or the cubicle type switchgear. Note that there is no need for the ground switch to be closed and the arrester connected to the main circuit conductor at all, and by combining the disconnector of the arrester with the ground switch, The purpose is to overcome the drawbacks of the prior art.

In order to achieve this object, the present invention provides a switchgear in which a lightning arrester is at least housed in a metal container having a ground potential, a first lightning arrester having one end fixed to a main circuit conductor and the other being disposed at the other end. The fixed contact portion and the second fixed contact portion arranged on the main circuit conductor are arranged to face each other, while the sliding contact portion connected to the ground conductor is formed on the first fixed contact portion and the first fixed contact portion. It is arranged in the middle of the second fixed contact portion and on the same axis, and one end thereof comes into contact with and separates from the first fixed contact portion and the other end comes into contact with and separates from the second fixed contact portion. At least the movable contact portion that comes into contact with the sliding contact portion when in contact with the first fixed contact portion or the second fixed contact portion is in the intermediate position with the first fixed contact portion and the second fixed contact portion. The sliding contact should be separated from each other by an appropriate distance required for insulation. The movable contact portion contacts the first fixed contact portion during normal energization, and the movable contact portion functions as the second fixed contact portion when the main circuit conductor is grounded. The movable contact portion is in contact with the main circuit conductor and is in an intermediate position between the first fixed contact portion and the second fixed contact portion during a withstand voltage test. Further, the metal container may be filled with an insulating medium such as insulating gas or insulating oil.

"Operation" During normal energization, one end of the arrester is connected to the main circuit conductor by bringing the movable contact portion into contact with the first fixed contact portion, and the other end is connected to the ground potential via the sliding contact portion. Become. Therefore, the equipment connected to this main circuit conductor is protected by the lightning arrester.

The main circuit conductor is grounded via the sliding contact portion by bringing the movable contact portion into contact with the second fixed contact portion during maintenance and inspection of the power transmission line or the cubicle type switchgear. Therefore, the maintenance and inspection work can be performed safely.

During the withstand voltage test of the cubicle type switchgear, the lightning arrester is separated from the ground conductor by moving the movable contact part at an intermediate position between the first fixed contact part and the second fixed contact part, and the movable contact part is movable. The contact portion secures a necessary insulation distance from each of the first fixed contact portion and the second fixed contact portion. Therefore, the withstand voltage test of the cubicle type switchgear can be carried out.

[Embodiment] An embodiment of the present invention will be described below in detail with reference to the drawings.

In the figure, a metal container 1 at ground potential is filled with an insulating medium 2 such as an insulating gas such as SF ₆ gas or insulating oil, and a circuit breaker and a disconnector (not shown) are connected by a main circuit conductor 3. It has been stored. Lightning arrester 4
Has one end fixed to the main circuit conductor 3 via the connection conductor 3a, and the other end is provided with a first fixed contact portion 5 formed of a chew lip contactor or the like.

Further, the ground conductor 3b having one end fixed to the main circuit conductor 3
A fixed contact portion 7 having substantially the same shape as the first fixed contact portion 5 is disposed at the other end of the first fixed contact portion 5 so as to face the first fixed contact portion 5.

On the other hand, in the middle of the first fixed contact portion 5 and the second fixed contact portion 7 and on the same axis, the sliding contact portion 8 supported by the ground conductor 6 fixed to the metal container 1 is provided. Is provided. The sliding contact portion 8 is formed in a hollow shape, has a first sliding current collector 8a on the side facing the first fixed contact portion 5, and has the second fixed contact portion 7 The second sliding current collector 8b is provided on the side opposite to.

Further, in the hollow portion of the sliding contact portion 8, one end comes into contact with and separates from the first fixed contact portion 5 and the other end comes into contact with and separates from the second fixed contact portion 7, and at least the first A movable contact portion 9 which is in contact with the fixed contact portion 5 or the second fixed contact portion 7 and which is in contact with the sliding contact portion 8 is arranged so as to be linearly reciprocally movable. That is, the movable contact portion 9
Is in contact with the first sliding current collector 8a when it comes into contact with the first fixed contact portion 5, and is in contact with the second sliding current collector 8b when it comes into contact with the second fixed contact portion 7. It seems to be. Further, the movable contact portion 9 is separated from the first fixed contact portion 5 and the second fixed contact portion 7 at an intermediate position, that is, in the state shown in the drawing, by an appropriate distance required for insulation. It is arranged. In this case, the movable contact portion 9 is not necessarily required at the intermediate position, but one of the first sliding current collector 8a and the second sliding current collector 8b is used to prevent it from becoming a floating electrode. Or it is desirable to be in contact with both.

Although the sliding contact portion 8 is provided with the first sliding current collector 8a and the second sliding current collector 8b at both ends, one sliding current collector is provided in the sliding contact portion 8. The movable contact portion 9 may be always in contact with the sliding contact portion 8 through the sliding current collector by providing.

Further, 10 is an operation shaft reciprocally rotated by an operation mechanism (not shown), 11 is one end fixed to the operation shaft 10,
The other end is an operation rod connected to the movable contact portion 9.

Next, the operation of the above embodiment will be described.

At the time of normal energization, if the operating shaft 10 is rotated clockwise by an operating mechanism (not shown) in the state shown in the figure, the movable contact portion 9 linearly moves to the right inside the sliding contact portion 8 via the operating rod 11. It moves and one end thereof comes into contact with the first fixed contact portion 5. As a result, one end of the lightning arrester 4 is connected to the main circuit conductor 3 via the connecting conductor 3a, and the other end thereof is the first fixed contact portion 5, the movable contact portion 9, the first sliding current collector 8a, and It is grounded through the sliding contact portion 8, the ground conductor 6, and the metal container 1. Therefore, when an abnormal voltage such as a lightning surge is applied to the main circuit conductor 3, it is discharged by the lightning arrester 4, so that the device connected to the main circuit conductor 3 is protected by the lightning arrester 4.

At the time of maintenance and inspection of the power transmission line or the cubicle type switchgear, if the operating shaft 10 is rotated in the counterclockwise direction by the operating mechanism (not shown) in the state shown in the figure, the movable contact portion 9 becomes the sliding contact portion 8. The inside moves linearly to the left, and the other end contacts the second fixed contact portion 7. As a result,
The main circuit conductor 3 is grounded via the connection conductor 3b, the second fixed contact portion 7, the movable contact portion 9, the sliding contact portion 8, the second sliding current collector 8b, the ground conductor 6, and the metal container 1. It Therefore,
Maintenance and inspection work can be carried out safely.

During the withstand voltage test of the cubicle type switchgear, the movable contact portion 9 is positioned in the state shown in the figure, that is, at the intermediate position between the first fixed contact portion 5 and the second contact portion 7. In this state,
The movable contact portion 9 has a distance necessary for insulation from the first fixed contact portion 5 and the second fixed contact portion 7, respectively. Therefore, since the lightning arrester 4 is separated from the ground potential, the withstand voltage test of the cubicle type switchgear can be carried out.

"Effect of the Invention" As described above in detail with the embodiments, in the prior art, the disconnector of the lightning arrester and the grounding switch were provided separately, but according to the present invention, both can be combined. So you can reduce the space needed,
The cubicle type opening / closing device can be downsized.

Also, since the necessary operations such as connecting or disconnecting the arrester to the main circuit conductor and opening / closing the earthing switch can be performed by one operating mechanism, the cubicle type switchgear should be downsized and the cost should be reduced. You can

Further, since the movable contact portion is at the ground potential, it is not necessary to insulate the movable contact portion from the operating mechanism, so that the structure is simple.

[Brief description of drawings]

 FIG. 1 is a partial sectional view showing an embodiment of the present invention. In the figure, 1 is a metal container, 2 is an insulating medium, 3 is a main circuit conductor, 4 is a lightning arrester, 5 is a first fixed contact portion, 6 is a ground conductor, 7 is a second fixed contact portion, and 8 is a sliding contact portion. Is a movable contact part.

Claims (2)

[Scope of utility model registration request] 1. A switchgear in which a lightning arrester is at least housed in a metal container having a ground potential, a first fixed contact portion disposed at the other end of the lightning arrester, one end of which is fixed to a main circuit conductor. The second fixed contact portion disposed on the main circuit conductor is arranged so as to oppose, and the sliding contact portion connected to the ground conductor is disposed on the first fixed contact portion and the second fixed contact portion. And one end of the first
Of the sliding contact portion in the state of being in contact with and separating from the fixed contact portion and the other end thereof being in contact with and separated from the second fixed contact portion and at least in contact with the first fixed contact portion or the second fixed contact portion. At the intermediate position, the movable contact portion that comes into contact with the first fixed contact portion and the second fixed contact portion can be linearly reciprocated in the sliding contact portion so as to be separated from each other by an appropriate distance required for insulation. The movable contact portion is in contact with the first fixed contact portion during normal energization, and the movable contact portion is in contact with the second fixed contact portion when the main circuit conductor is grounded; The switchgear according to claim 1, wherein the movable contact portion is arranged at an intermediate position between the first fixed contact portion and the second fixed contact portion during the withstand voltage test. 2. The switchgear according to claim 1, wherein the metal container is filled with an insulating medium such as insulating gas or insulating oil.