JPH06105424A - Gas insulated equipment - Google Patents

Abstract

PURPOSE:To provide a gas insulated equipment which has great effect of suppressing surge voltage with simple and light-weight structure. CONSTITUTION:A pair of hollow fixed electrodes 4a and 4b connected to a high-pressure center conductor 11 are counterposed closely, on the same axis of this, on the center axis of a cylindrical earth metallic container 1. A contact is provided, in the condition of being slidable in contact with the outside periphery of a mobile electrode 6, at the inside periphery of the fixed electrode 4b. A light-weight tube having high conductivity such as, for example, an aluminum material, etc., being supported a specified interval apart from any of the these earth metallic containers 1 and besides being insulated from these and besides coaxially is provided outside of the structure of the center structure such as a high-pressure center conductor 11, etc. Hereby, reliability can be increased by the improvement of the suppression effect of the surge voltage.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for improving reliability of power supply of a gas insulation device using an insulating gas, for example, a gas insulation switchgear.

[0002]

2. Description of the Related Art FIG. 4 is a sectional view showing a conventional gas-insulated switchgear disclosed in, for example, Japanese Patent Laid-Open No. 61-227325. This gas-insulated switchgear is a switchgear for a high-voltage circuit in which a busbar, a circuit breaker, a disconnector, etc. are housed in a grounded metal container filled with an insulating gas. In the figure, a cylindrical ground metal container 1 is filled with an inert gas such as SF ₆ gas, which is inert, incombustible, odorless, and has a dielectric strength. The pair of insulating spacers 2 are formed in a shallow dish shape, and are fixed to the inner surfaces of the flanges 1f of the grounded metal container 1 with their bottom portions facing the fixed electrodes 4a and 4b. Further, on the central axis of the grounded metal container 1 or in the vicinity thereof, the connection electrode 12
A pair of hollow fixed electrodes 4a, 4b integrally formed with
Are arranged in close proximity to each other and are supported by penetrating a hole provided in the center of the insulating spacer 2.
Contactors 5a, 5b are provided on the inner peripheral surfaces of the fixed electrodes 4a, 4b,
While the outer peripheral surface is in contact with the contact 5b of one fixed electrode 4b,
Movable electrode 6 that can slide on the central axis of the grounded metal container 1
Is provided. An arc contact 8 is provided at the tip of the movable electrode 6. An operating mechanism 10 is provided outside the grounded metal container 1, and the operating force applied to the operating mechanism 10 is transmitted to the movable electrode 6 via the operating rod 9. The operating force transmitted to the movable electrode 6 allows the movable electrode 6 to be slidably inserted into the hollow portion of the fixed electrode 4a so that the movable electrode 6 can be moved back and forth on the central axis. In this way, the movable electrode 6 is brought into contact with and separated from the fixed electrode 4a, and the current flowing through the high voltage central conductor 11 can be opened and closed. Between the pair of insulating spacers 2, an iron magnetic material structure 16 in which a plurality of magnetic material thin plates are laminated in a cylindrical shape is insulated from the fixed electrodes 4a and 4b so as to coaxially cover them. Is provided. A predetermined gap L is provided between the inner surface of the grounded metal container 1 and the outer surface of the magnetic material structure 16.

[0003]

Since the magnetic material structure of the conventional gas-insulated equipment as described above is formed by laminating a plurality of magnetic material thin plates such as iron in a cylindrical shape, the structure is complicated. Then, there was a drawback that the weight became heavy.

The present invention has been made to solve the above-mentioned problems, and has a simple and lightweight structure, and has a simple structure and a light-weight structure, which prevents the surge voltage generated in the grounded metal container during the disconnection operation of the disconnecting section. An object is to provide a gas-insulated device that suppresses gas.

[0005]

According to a first aspect of the present invention, there is provided a gas-insulated device, a cylindrical ground metal container filled with an insulating gas, a fixed electrode provided on a central axis of the ground metal container, and a movable member. A disconnection portion composed of electrodes, a high-voltage center conductor connected to both sides of the disconnection portion provided on a substantial center axis in the grounding metal container, and a ground metal container so as to surround the disconnection portion. And a cylindrical conductive plate having a single-layer structure provided coaxially.

[0006]

The serge current generated in the grounded metal container at the time of shutting off the disconnecting portion causes an induction current to flow in the cylindrical conductive plate 17, and the current consumes the serge of the surge, so that the high frequency surge is generated. -Suppress the sharp crest value of the edge.

[0007]

First Embodiment FIG. 1 is a sectional view of a gas insulation device showing a first embodiment according to the invention of claim 1. In FIG. 1, a cylindrical grounded metal container 1 is filled with an inert gas such as SF ₆ gas, which is inert, incombustible, odorless, and has a dielectric strength. The pair of insulating spacers 2 are formed in a shallow dish shape, and are fixed to the inner surface of the flange 1f of the grounded metal container 1, respectively. A high-voltage center conductor 11 is supported by the pair of insulating spacers 2 on the central axis of the grounded metal container 1 by penetrating a hole provided in the central portion of the insulating spacer 2. The high voltage center conductor 11 has a pair of hollow fixed electrodes 4a,
4b is connected and fixed. A contactor 5 is provided on the inner peripheral surface of the fixed electrode 4b so as to be in contact with the outer peripheral surface of the movable electrode 6 and slidable. The operating mechanism 10 is provided outside the grounded metal container 1, and the operating force applied to the operating mechanism 10 is transmitted to the movable electrode 6 via the operating rod 9. The operating force transmitted to the movable electrode 6 causes the movable electrode 6 to slide forward and backward on the central axis and is fitted into the hollow portion of the fixed electrode 4a. In this way, the movable electrode 6 is brought into contact with and separated from the fixed electrode 4a, and the current flowing through the high voltage central conductor 11 can be opened and closed. The fixed electrodes 4a and 4b, the contactor 5, and the movable electrode 6 constitute a disconnecting section 7. A light-weight and electrically conductive metal plate, for example, a cylindrical conductive plate 17 made of an aluminum material is installed in the grounded metal container 1 so as to surround the disconnecting section 7 and is insulated from the metal plate. Therefore, the grounded metal container 1 can be used when shutting off.
A surge current generated in the high-voltage center conductor 11 inside flows inside the cylindrical conductive plate 17 to cause an inductance in the cylindrical conductive plate 17. In this way, by inducing a surge current on the cylindrical conductive plate 17, the steep wave crest value of the high frequency surge is suppressed. If there is a possibility that eddy current will be generated in the cylindrical conductive plate 17 and excessive heat will be generated, measures against eddy current such as inserting a fissure parallel to the central axis direction in the cylindrical conductive plate 17 in advance. By doing so, the magnitude of the eddy current can be controlled.

Second Embodiment In the first embodiment, the cylindrical conductive plate 17 is installed in the grounded metal container 1 so as to be insulated from it.
As shown in FIG. 2, by fixing both ends of the cylindrical conductive plate 17 to the grounded metal container 1 with the supports 18 having a predetermined resistance value, the support 18 is formed and the grounded metal container 1 and the cylindrical conductive plate 1 are made conductive. Board 17
It can have a function as a fixing material for a and a function as an attenuator for attenuating a surge current. That is, the surge voltage generated between the high-voltage center conductor 11 and the grounded metal container 1 due to the opening / closing of the disconnecting section 7 is caused between the high-voltage center conductor 11 and the cylindrical conductive plate 17, and between the cylindrical conductive plate 17 and the grounded metal container. It is divided by 1 at each surge impedance ratio.
The serge current flowing based on the voltage generated in the cylindrical conductive plate 17 due to the partial pressure ratio is attenuated by the support 18 and flows into the grounded metal container 1. As a result, it is possible to prevent corona discharge generated between the grounded metal container 1 and the shielding cylindrical conductive plate 17 due to the imbalance of the electric field distribution, and to suppress the surge voltage. If impedance matching is performed by setting the resistance value of the support 18 to be substantially the same as the surge impedance between the cylindrical conductive plate 17 and the grounded metal container 1, here. The surge between the shield cylindrical conductive plate 17 and the grounded metal container 1 can be absorbed by the support 18 without reflection. Therefore, the effect of suppressing the surge voltage can be increased.

Third Embodiment Further, as shown in FIG. 3, by providing a small hole 19 in the lower portion of the cylindrical conductive plate 17 of the first and second embodiments, a metal which may impair the insulation property. A function of capturing fine particles can be provided. That is, in the grounded metal container 1, there are metal fine particles that repeatedly fly randomly due to the vibration and the force of the electric field to cause the insulation characteristics to deteriorate. In a normal state without surge, the cylindrical conductive plate 17 and the grounded metal container 1 have the same potential, so that the cylindrical conductive plate 17,
Shield space 20 surrounded by support 18 and grounded metal container 1
The inside is a non-electric field area. The metallic fine particles that randomly move around in the insulating gas 3 may approach the vicinity of the shield space 20. When it comes close to the small hole 19, the metallic fine particles enter the shield space 20 through the small hole 19 due to its own gravity. Here, since the shield space 20 has no electric field, the metallic fine particles stand still in a random motion and are captured. In this way, by providing the holes 19 in the cylindrical conductive plate 17, the metal fine particles flying around in the grounded metal container 1 are trapped in the shield space 20 to have a function as a metal fine particle trap. You can

In each of the above embodiments, an example of using an aluminum material for the cylindrical conductive plate 17 has been shown, but if a single layer of thin iron material is used, the surge voltage suppression effect is further enhanced. Further, in each of the above-mentioned embodiments, the disconnecting portion 7 is arranged so as to be covered by the pair of cylindrical conductive plates 17 which are bisected in the axial direction, but the disconnecting portion 7 is entirely covered by the single continuous shield cylinder 17. Even if it is covered, the same effect is obtained.

[0011]

According to the present invention, both of these and the ground metal container are separated from each other by a predetermined distance on the outside of the central structure such as the high-voltage center conductor, and are insulated and substantially coaxial with them. A cylindrical body with a single-layer structure that is supported and has high conductivity,
For example, by forming a gas-insulated device in which a single-layer cylinder of aluminum or the like is arranged, a single-layered gas-insulated device that is easy to install and lightweight and that has a large serge voltage suppression effect is provided. be able to.

[Brief description of drawings]

FIG. 1 is a sectional view of a gas insulation device showing a first embodiment of the present invention.

FIG. 2 is a sectional view of a gas insulation device showing a second embodiment of the present invention.

FIG. 3 is a sectional view and a partially enlarged view of a gas insulation device showing a third embodiment of the present invention.

FIG. 4 is a cross-sectional view of a gas insulation device showing a conventional example of the present invention.

[Explanation of symbols]

 1 Grounded Metal Container 2 Insulation Spacer 3 Insulating Gas 4a Fixed Electrode 4b Fixed Electrode 6 Movable Electrode 7 Disconnector 9 Operation Rod 10 Operating Mechanism 11 High Voltage Center Conductor 17 Cylindrical Conductive Plate 18 Support 19 Hole

[Procedure amendment]

[Submission date] April 16, 1993

[Procedure Amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

[0007]

First Embodiment FIG. 1 is a sectional view of a gas insulation device showing a first embodiment according to the invention of claim 1. In FIG. 1, a cylindrical grounded metal container 1 is filled with an inert gas such as SF ₆ gas, which is inert, incombustible, odorless, and has a dielectric strength. The pair of insulating spacers 2 are formed in a shallow dish shape, and are fixed to the inner surface of the flange 1f of the grounded metal container 1, respectively. A high-voltage center conductor 11 is supported by the pair of insulating spacers 2 on the central axis of the grounded metal container 1 by penetrating a hole provided in the central portion of the insulating spacer 2. The high voltage center conductor 11 has a pair of hollow fixed electrodes 4a,
4b is connected and fixed. A contactor 5 is provided on the inner peripheral surface of the fixed electrode 4b so as to be in contact with the outer peripheral surface of the movable electrode 6 and slidable. The operating mechanism 10 is provided outside the grounded metal container 1, and the operating force applied to the operating mechanism 10 is transmitted to the movable electrode 6 via the operating rod 9. The operating force transmitted to the movable electrode 6 causes the movable electrode 6 to slide forward and backward on the central axis and is fitted into the hollow portion of the fixed electrode 4a. In this way, the movable electrode 6 is brought into contact with and separated from the fixed electrode 4a, and the current flowing through the high voltage central conductor 11 can be opened and closed. The fixed electrodes 4a and 4b, the contactor 5, and the movable electrode 6 constitute a disconnecting section 7. A light-weight and electrically conductive metal plate, for example, a cylindrical conductive plate 17 made of an aluminum material is installed in the grounded metal container 1 so as to surround the disconnecting section 7 and is insulated from the metal plate. Therefore, the grounded metal container 1 can be used when shutting off.
Sa generated in the high-pressure center conductor 11 of the - di current, high pressure center
It flows between the conductor 11 and the cylindrical conductive plate 17. In this way, by inducing a serge current on the cylindrical conductive plate 17, the steep wave front value of the high frequency surge is suppressed by the inductance of the cylindrical conductive plate 17 . If there is a possibility that eddy current will be generated in the cylindrical conductive plate 17 and excessive heat will be generated, measures for eddy current such as inserting a fissure parallel to the central axis direction in the cylindrical conductive plate 17 in advance. By doing so, the magnitude of the eddy current can be controlled.

Claims (1)

[Claims] 1. A cylindrical grounded metal container filled with an insulating gas, a disconnection section provided on a central axis of the grounded metal container and composed of a fixed electrode and a movable electrode, and a substance inside the grounded metal container. A high-voltage central conductor provided on the central axis and connected to both sides of the disconnection portion, and a cylindrical conductive plate having a single-layer structure coaxially provided with the ground metal container so as to surround the disconnection portion. , Gas-insulated equipment.