JPH0343777Y2 - - Google Patents

Description

[Detailed description of the invention] "Field of industrial application" The present invention relates to a switchgear in which multiple devices are housed in a metal container, such as a cubicle type switchgear, and in particular the structure of a lightning arrester and a grounding switch. Regarding.

"Prior Art" Generally, a cubicle type switchgear or a reduced type GIS switchgear (hereinafter referred to as a cubicle type switchgear) has a circuit breaker and a circuit breaker installed in a metal container at ground potential.
It consists of devices such as disconnectors, lightning arresters, and earthing switches that are housed together. Among the above-mentioned devices, a lightning arrester is a device that protects the entire device by discharging an abnormal voltage such as a lightning surge when it is applied. Therefore, when carrying out a withstand voltage test of the cubicle type switchgear, it is necessary to disconnect the lightning arrester from the main circuit conductor since the test voltage cannot of course be applied. For this reason, lightning arresters usually include
A disconnecting section is provided, and the circuit is configured to be connected to or disconnected from the main circuit conductor by this disconnecting section.

On the other hand, when performing maintenance and inspection on power transmission lines or cubicle-type switchgear, it is necessary to ground the main circuit conductor in order to carry out the work safely.
For this reason, earthing switches are installed at the power transmitting and receiving ends.

``Problem to be solved by the invention'' Conventionally, the above-mentioned disconnecting section and earthing switch of the lightning arrester are:
Each was set up separately. Therefore, a large space is required to accommodate these in a metal container, resulting in the disadvantage that the entire device becomes large. Furthermore, an operating mechanism for connecting and disconnecting the disconnection section of the lightning arrester from the main circuit conductor and an operating mechanism for the grounding switch must be provided separately, which has the disadvantage of being expensive.

``Means for Solving the Problems'' This invention proposes that when the earthing switch is closed during maintenance and inspection of power transmission lines or cubicle type switchgear, the lightning arrester does not need to be connected to the main circuit conductor for its function. In other words, we focused on the fact that there is no need for the grounding switch to be in a closed state and the lightning arrester to be connected to the main circuit conductor, and by making the disconnection part of the lightning arrester double as the grounding switch, The purpose is to solve the shortcomings of the technology.

In order to achieve this object, the present invention provides a switchgear in which at least a lightning arrester is housed in a metal container at ground potential. The second fixed contact part disposed on the ground conductor located at A movable contact part, which is rotatably disposed with its end always in contact with the main circuit conductor, is placed between the first fixed contact part and the second fixed contact part at an intermediate position for the necessary insulation. The movable contact portion contacts the first fixed contact portion during normal energization, and the movable contact portion contacts the second fixed contact portion when the main circuit conductor is grounded. The movable contact portion is configured to be in an intermediate position between the first fixed contact portion and the second fixed contact portion during a withstand voltage test of the main circuit conductor.

Further, the metal container may be filled with an insulating medium such as an insulating gas or an insulating oil.

"Operation" During normal energization, the lightning arrester is connected to the main circuit conductor by bringing the movable contact part into contact with the first fixed contact part. Therefore, equipment connected to this main circuit conductor is protected by a lightning arrester.

During maintenance and inspection of power transmission lines or cubicle type switchgear, the main circuit conductor is grounded by bringing the movable contact portion into contact with the second fixed contact portion. Therefore, maintenance and inspection work can be carried out safely.

When testing cubicle type switchgear withstand voltage,
By locating the movable contact part at an intermediate position between the first fixed contact part and the second fixed contact part, the lightning arrester is disconnected from the main circuit conductor, and the movable contact part is located between the first fixed contact part and the second fixed contact part. and the second fixed contact portion, respectively necessary insulation distances are ensured. Therefore, a withstand voltage test of the cubicle type switchgear can be carried out.

"Embodiments" Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

In the figure, inside the metal container 1 at ground potential,
It is filled with an insulating gas such as SF ₆ gas or an insulating medium 2 such as insulating oil, and a circuit breaker, disconnector, etc. (not shown) are connected and housed by a main circuit conductor 3. One end of the lightning arrester 4 is attached to the metal container 1, and the other end, which is the live part side, is provided with a first fixed contact part 5 formed of a finger contact or the like.

Furthermore, at the other end of the ground conductor 6, one end of which is attached to the metal container 1 and is at ground potential, a fixed contact part 7 having substantially the same shape as the first fixed contact part 5 is connected to the first fixed contact part. is placed opposite to.

Further, between the first fixed contact part 5 and the second fixed contact part 7, the tip thereof can come into contact with and separate from the first fixed contact part 5 and the second fixed contact part 7, A movable contact portion 9 is disposed so as to be rotatable such that its base end is always in contact with the main circuit conductor 3 via a hinge portion 8. Further, this movable contact portion 9 is connected to the first fixed contact portion 5 and the second fixed contact portion 5.
When located at an intermediate position A between the first fixed contact part 5 and the second fixed contact part 7, the first fixed contact part 5 and the second fixed contact part 7 are spaced apart from each other by an appropriate distance necessary for insulation.

Further, reference numeral 10 denotes an operating lever that rotates back and forth by an operating mechanism not shown, and 11 indicates this operating lever 10.
This is an insulating rod that connects the movable contact portion 9 and the movable contact portion 9.
In this case, since it is sufficient to insulate between the operating mechanism and the movable contact portion 9, the operating lever 10 may be insulated, for example.

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

During normal energization, the movable contact portion 9 is located at the position shown by the solid line, that is, its tip is located at the first fixed contact portion 5.
be in contact with. In this state, the lightning arrester 4 is connected to the main circuit conductor 3 via the first fixed contact part 5, the movable contact part 9, and the hinge part 8. Therefore, if an abnormal voltage such as a lightning surge is applied to the main circuit conductor 3, it will be discharged by the lightning arrester 4, so equipment connected to the main circuit conductor 3 will be protected by the lightning arrester 4. .

During maintenance and inspection of power transmission lines or cubicle-type switchgears, the operating lever 10 is rotated clockwise by an operating mechanism (not shown). This rotation of the operating lever 10 causes the insulating rod 11 to move to the right, and the movable contact portion 9 to rotate counterclockwise around the hinge portion 8 so that its tip is separated from the first fixed contact portion 5. The second fixed contact portion 7 is contacted at a distance.
As a result, the main circuit conductor 3 is grounded by the ground conductor 6 via the hinge portion 8, the movable contact portion 9, and the second fixed contact portion 7. Therefore, maintenance and inspection work can be carried out safely.

When testing cubicle type switchgear withstand voltage,
Performing the same operation as above, move the movable contact part 9 to the intermediate position A between the first fixed contact part 5 and the second contact part 7.
to be located. As a result, the movable contact portion 9 is provided with 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 main circuit conductor 3, a withstand voltage test of the cubicle type switchgear can be performed.

"Effects of the Invention" As described above in detail along with the embodiments, in the conventional technology, the disconnecting section of the lightning arrester and the grounding switch were each provided separately, but according to the present invention, it is possible to make them both serve as the same. Therefore, the required space can be reduced, and the cubicle type switchgear can be made smaller.

In addition, necessary operations such as connecting or disconnecting the lightning arrester to the main circuit conductor and opening/closing the earthing switch can be performed with a single operating mechanism, thereby reducing the size and cost of the cubicle switchgear. I can do it.

[Brief explanation of the drawing]

The figure is a partially sectional view showing an embodiment of the present invention. In the figure, 1 is a metal container, 2 is an insulating medium, and 3
4 is a main circuit conductor, 4 is a lightning arrester, 5 is a first fixed contact part, 6 is a ground conductor, 7 is a second fixed contact part, and 9 is a movable contact part.

Claims (1)

[Claims for Utility Model Registration] (1) In a switchgear in which at least a lightning arrester is housed in a metal container at ground potential, a first fixed contact part disposed on the live part side of the lightning arrester and a metal container at ground potential and a second fixed contact portion disposed on the ground conductor located at the ground conductor. A movable contact part, which is rotatably disposed with its end always in contact with the main circuit conductor, is placed between the first fixed contact part and the second fixed contact part at an intermediate position for the necessary insulation. The movable contact portion contacts the first fixed contact portion during normal energization, and the movable contact portion contacts the second fixed contact portion when the main circuit conductor is grounded. contact,
The switching device is characterized in that the movable contact portion is located at an intermediate position between the first fixed contact portion and the second fixed contact portion during a withstand voltage test of the main circuit conductor. (2) The switchgear according to claim (1), wherein the metal container is filled with an insulating medium such as an insulating gas or an insulating oil.