JPH0361973B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a switchgear, and particularly to a switchgear suitable for a disconnector, a grounding switch, etc. of a gas-insulated switchgear.

[Background of the invention]

In switchgear constructed in a container filled with an insulating medium such as insulating gas or insulating oil, a shield that improves potential distribution is effectively used to maintain good insulation between high-voltage and low-voltage parts. ing.

Although this shield is placed in a desirable position for alleviating the electric field, consideration of its support etc. affects the fabrication of the entire switchgear.

This will be explained with reference to FIG. FIG. 1 shows a disconnector of a gas-insulated switchgear as an example of a switchgear.

In a container 1 filled with SF ₆ gas, there is a high voltage conductor 3 supported by an insulating spacer 2 etc., and a current collector 4 is supported on this high voltage conductor 3. A high voltage conductor 5 separated from this current collector 4 by a predetermined distance between electrodes
A stator 6 is attached to the. The movable element 7, which is always in electrical contact with the current collector 4, is in contact with the stator 6 to form a closed circuit state. One end of an insulated operating rod 8 is connected to the right end of the mover 7, and the other end of the insulated operating rod 8 is connected to a lever 10 by a pin 9. The rotation shaft of the lever 10 is led out of the container 11 through a sealing device, and its rotation is controlled by a drive device (not shown). The rotary lever 10 of the rotary shaft undergoes a pendulum movement, and the movable element 7 is moved through the insulated operating rod 8.
Open/close operations.

The position of the pin 9 is different between the closed circuit state and the open circuit state shown in the figure, and it also disturbs the potential distribution, so the shield 1
2 is provided. The shield 12 is attached using a connecting flange 11a between the container 11 and the container 1, which is called a mechanism storage case.

The shield 12 in the illustrated position covers the pin 9 in the illustrated closed circuit state and improves the potential distribution at the part facing the current collector 4, so that in the open circuit state, the shield 12 can maintain the insulation of the insulated operating rod 8. This acts to shorten the effective axial length. In other words, in order to fix the shield 12 in such a position, the flange 11a is necessary, and the container 1
It was necessary to separate the container 11 from the container 11.

[Purpose of the invention]

An object of the present invention is to provide a switchgear having a shield that does not shorten the axial length effective for maintaining insulation of an insulated operating rod.

[Summary of the invention]

In the present invention, a shield is attached to an insulated operating rod, and the shield is made approximately circular in order to prevent displacement of the shield with respect to the insulated operating rod due to rotation of the lever.

Although the present invention can be applied to disconnectors, grounding switches, and other switching devices that use an insulating medium such as insulating gas or insulating oil, the following description uses a gas-insulated disconnector as an example.

[Embodiments of the invention]

In FIG. 2, parts equivalent to those in FIG. 1 are given the same reference numerals, and their details are omitted.

Pin 9 connecting insulated operating rod 8 and lever 10
A circular shield 20 is attached using the. As shown in FIG. 3, a pair of levers 10a, 10b are arranged on both sides of the insulated operating rod 8, and shields 20a, 20b are placed on the outside of the levers.
are arranged, and they are pin-connected by pin 9.

The shields 20a and 20b may have a semicircular cross section, or may be made into a dish shape as shown in FIG. 4, as long as the overall plane is approximately circular.
Further, the shields 20a and 20b may be simple disks, but if we consider the potential distribution with respect to the container 1 at the portion facing the disks and the prevention of electric field concentration at the outer periphery, it is recommended that the outer periphery be annular in cross section. good. In other words, the annular pipe may be attached using pins 9. Further, the shields 20a and 20b only need to be approximately circular, and do not need to be completely circular. In other words, it is sufficient that the following effects can be expected, and it is sufficient that the electric field is circular.

Since the lever 10 moves in an arc, when a shield as shown in FIG. 1 is attached to the pin 9, the lever 10
The opposing surfaces of the current collector 4 and the shield change depending on the angle, and the potential distribution on the opposing surfaces cannot always be maintained constant. However, since the shield 20 in FIG. 2 has a disk shape, the state of the portion facing the current collector 4 can be kept constant regardless of the angle of the lever 10. Therefore, the installation of the shield 20 is as follows:
It is preferable that the pin 9 be positioned approximately at the center. In FIG. 2, the end cap 1a of the container 1 and the shield 20 are at the same potential via the rotating shaft of the lever 10, etc., so there is no need to control the potential distribution between them. The aforementioned collector 4
While maintaining the relationship between the end cover 1 of the shield 20
Even if the facing portion on the a side is cut out to form a crescent shape, the electric field is equivalent to that shown in FIG. 2.

With such a configuration, there is no need to separate the part that accommodates the lever 10 from the container 1, so the common container 1 can be used as shown in FIG. 2, which simplifies the configuration.

Note that the present invention is not limited to the configuration shown in the drawings, but can be applied to general configurations known as this type of switchgear.

〔Effect of the invention〕

As described above, in the present invention, since a substantially circular shield is provided between the insulated operating rod and the lever, a favorable potential distribution state can be maintained regardless of the angle of the lever.

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view of a conventional switchgear, FIG. 2 is a longitudinal cross-sectional view of a switchgear according to an embodiment of the present invention, FIG. 3 is a cross-sectional view taken along the - line in FIG. 2, and FIG. 4 is a longitudinal cross-sectional view of a conventional switchgear. FIG. 2 is a cross-sectional view of a main part of a switchgear according to another embodiment of the present invention. 1... Container, 4... Current collector, 6... Stator, 7
...Mover, 8...Insulated operating rod, 9...Pin, 1
0...Lever, 20a, 20b...Shield.

Claims (1)

[Claims] 1. A container filled with an insulating medium has a pair of releasable contacts, and an insulating operating rod connected to a movable element of the contact is reciprocated by a lever. 1. A switchgear for opening and closing said contactor, characterized in that said lever and said insulated operating rod are connected by a pin, and said pin supports substantially the center of a substantially circular shield. 2. The opening/closing device according to claim 1, wherein the disc-shaped shield is a pair of shields, and the insulated operating rod is positioned between the pair of shields and connected by the pin.