JPH08205342A - Gas insulation switchgear - Google Patents

Abstract

PURPOSE: To provide a gas insulation switchgear which allows lowering the height of the entire equipment and thereby reduces the size thereof. CONSTITUTION: In a gas insulation switchgear which has a gas cutoff 2 and a pair of earth switches 6 which are connected to charging sections 2a, 2a located on both ends of the cutoff 2, the earth switches 6 are provided in insulating supporting cylinders 4 which support the charging sections 2a, 2a, insulating them from each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas insulated switchgear, and more particularly to the structure of a ground switch installed for maintenance and inspection of a circuit breaker.

[0002]

2. Description of the Related Art In a circuit breaker applied to a gas insulated switchgear, the charging part is completely sealed in an insulating gas. Therefore, grounding switches are connected to both ends of the circuit breaker to measure, for example, contact resistance. Conducts insulation resistance measurements and circuit breaker operation tests. Therefore, it is desirable that the earthing switch be placed as close to the circuit breaker as possible.

FIG. 4 is a side view showing the structure around a circuit breaker of a conventional gas-insulated switchgear of this type. In the figure, 1 is a circuit breaker mounting base, 2 is a circuit breaker operated by an operating mechanism 3, and charging portions 2a, 2a arranged at both ends are insulated and supported on the circuit breaker mounting base 1 by insulating support cylinders 4, respectively. Has been done. Reference numeral 5 denotes a pair of grounding switches connected to both charging parts 2a and 2a of the circuit breaker 2. The fixing part 5a is insulated and fixed to the circuit breaker mounting base 1 and the charging parts 2a and 2a are electrically connected to each other. And a movable portion 5c which can be brought into contact with and separated from the fixed portion 5a by operating the drive lever 5b.

In the gas-insulated switchgear configured as described above, the circuit breaker (not shown) connected to both ends of the circuit breaker 2 is opened to isolate the circuit breaker 2 from the power source side and the load side. After that, each grounding switch 5 is turned on, and desired measurement, test, maintenance, and inspection are performed.

[0005]

Since the circuit breaker periphery of the conventional gas-insulated switchgear is constructed as described above and each ground switch 5 is connected to the circuit breaker 2 in series in the longitudinal direction,
The dimension in the longitudinal direction is required to be the sum of the dimension A of the circuit breaker 2 alone and the dimension B of both grounding switches 5 (A + 2B), which increases the height of the entire device and increases the size. was there.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a gas-insulated switchgear which can be miniaturized.

[0007]

A gas-insulated switchgear according to claim 1 of the present invention is provided with a circuit breaker and a pair of ground switches respectively connected to charging parts at both ends of the circuit breaker. In the above, each grounding switch is housed and arranged in an insulating support cylinder that insulatively supports both charging parts.

The gas-insulated switchgear according to a second aspect of the present invention is the gas-insulated switchgear according to the first aspect, in which the ground switch is disposed so as to face the fixed contact formed by the charging section of the circuit breaker and the fixed contact. The grounding conductor is embedded in the grounding bushing and has a sliding hole in the center that extends in a direction away from the fixed contact. And a movable contact composed of a spherical contact portion capable of contacting the fixed contact in a state where the sliding contact portion at the other end maintains the fitting with the sliding hole.

A gas-insulated switchgear according to claim 3 of the present invention is an insulated switchgear comprising a disconnector connected to a busbar and a ground switch connected to a busbar-side charging section of the disconnector. The grounding switch is embedded in a fixed contact formed at the busbar side charging portion of the disconnector and a grounding bushing that is arranged so as to face the fixed contact, and extends in a direction away from the fixed contact at the center. Fit a grounding conductor with a moving hole, a spherical sliding contact part that fits into the sliding hole of the grounding conductor at one end and slides, and a sliding contact part at the other end with the sliding hole. The movable contact comprises a spherical contact portion capable of contacting with the fixed contact in a maintained state.

[0010]

The pair of ground switches of the gas-insulated switchgear according to claim 1 of the present invention are housed and arranged in the insulating support cylinders that insulate and support the charging portions at both ends of the circuit breaker, respectively, whereby the circuit breaker is provided. To reduce the longitudinal dimension of.

Further, the movable contact of the grounding switch of the gas-insulated switchgear according to claim 2 of the present invention is such that the sliding contact portion at one end maintains contact with the sliding hole of the grounding conductor and the other end contacting portion. Part contacts the fixed contact.

Further, the movable contact of the grounding switch of the gas insulated switchgear according to claim 3 of the present invention is such that the sliding contact portion at one end maintains contact with the sliding hole of the grounding conductor while the other contacting end is in contact. Part contacts the fixed contact.

[0013]

【Example】

Example 1. 1 is a side view showing the configuration around a circuit breaker of a gas insulated switchgear according to Embodiment 1 of the present invention, and FIG.
3 is a cross-sectional view showing in detail the configuration of the ground switch in FIG.
In the figure, a circuit breaker mounting base 1, a circuit breaker 2, a charging unit 2
a, 2b, the operating mechanism 3, and the insulating support cylinder 4 are the same as those of the conventional device shown in FIG.

Reference numeral 6 denotes a pair of grounding switches which are arranged at right angles to the axial center of the circuit breaker 2 and outwardly facing the charging portions 2a, 2a at both ends, and which are part of the charging portions 2a, 2a at both ends. The formed fixed contact 6a, the support frame 6b which is erected on the outer surface of the circuit breaker mounting base 1, the ground bushing 6c which is mounted on the support frame 6b and is disposed so as to face the fixed contact 6a, and the ground. A grounding conductor 6d which is embedded in the bushing 6c and has a sliding hole 6d ₁ formed in the center thereof, and a spherical sliding contact portion 6e which is fitted into the sliding hole 6d _{1 at} one end and slides.
₁ and a movable contact 6e having a spherical contact portion 6e ₂ formed at the other end capable of contacting with the fixed contact 6a, and a three-phase collective connection insulating shaft 7 are driven to rotate and move by rotation. Lever 6 for moving contact 6e
f and.

The movable contact 6e can keep the one-end sliding contact portion 6e ₁ kept fitted with the sliding hole 6d ₁ even when the other end contact portion 6e ₂ is in contact with the fixed contact 6a. The dimensions are set as follows. Further, the ground switch housing space (indicated by A in the figure) formed by the support frame 6b and the ground bushing 6c is sealed from the outside air,
An insulating gas atmosphere similar to that of the circuit breaker 2 is formed.

Next, the operation of the gas-insulated switchgear according to the first embodiment constructed as described above will be described. First,
In FIG. 2, when the three-phase collective connection insulating shaft 7 is driven to rotate clockwise, the lever 6f rotates to move the movable contact 6
e moves as shown by the one-dot chain line in the figure, and the other end contact portion 6e
₂ comes into contact with the fixed contact 6a to be in the "closed" state.
The fixed contact 6a and the movable contact 6e are completely insulated from the container of the device by the three-phase collective connection insulating shaft 7 and the ground bushing 6e, so that the function as a ground switch is sufficient. Are satisfied with.

As described above, according to the first embodiment, the grounding switch 6 is housed in each of the insulating support cylinders 4 supporting the charging portions 2a at the both ends of the circuit breaker 2, respectively.
As shown in FIG. 1, since the dimension in the longitudinal direction can be made only by the dimension A of the circuit breaker 2 alone, the height of the entire device can be lowered, downsizing can be achieved, and the cost can be reduced.

Further, the sliding contact portions 6e ₁ and 6e ₂ on both ends of the movable contact 6e are spherical, and the sliding contact portion 6e ₁ is slid in the sliding hole 6d ₁ of the ground conductor 6d. Since the contact state is maintained, it is not necessary to separately prepare a movable contact guide, and it is not necessary to adjust the dimensions of the contact portion, which facilitates the assembling work.

Example 2. In the first embodiment described above, the case where the grounding switch 6 is connected to both ends of the circuit breaker 2 has been described. However, as shown in FIG. 3, the grounding switch 6 is connected to the circuit breaker 2 and a bus bar (not shown). It may be applied to the charging part of the disconnector 8 connected between the two, and a part of the charging part of the disconnector 8 may be used as a fixed contact for grounding the busbar. Without having to prepare
Since it is not necessary to adjust the size of the contact portion, the assembling work becomes easy.

[0020]

As described above, according to claim 1 of the present invention, in the gas-insulated switchgear including the circuit breaker and the pair of ground switches respectively connected to the charging parts at both ends of the circuit breaker, Since the grounding switch is housed and arranged in the insulating support cylinder that insulates and supports both charging parts, it is possible to provide a gas-insulated switchgear that can be downsized.

[0021] According to a second aspect of the present invention, in the first aspect, the ground switch is provided with a fixed contact formed by the charging portion of the circuit breaker, and a ground bushing disposed so as to face the fixed contact. A grounding conductor that is buried inside and has a sliding hole in the center that extends in the direction away from the fixed contact, and a spherical sliding contact that slides by fitting into the sliding hole of the grounding conductor at one end. Since the sliding contact portion is configured to be a fixed contact and a movable contact formed of a spherical contact portion capable of contacting with the sliding contact portion at the other end while maintaining the fitting with the sliding hole, not to mention miniaturization. That is, it is possible to provide a gas-insulated switchgear that is easy to assemble.

According to a third aspect of the present invention, in the insulating switchgear including the disconnector connected to the busbar and the grounding switch connected to the busbar side charging portion of the disconnector, the grounding switch is provided. , A fixed contact formed at the bus-side charging portion of the disconnector, and a sliding hole that is embedded in the ground bushing facing the fixed contact and extends in the direction away from the fixed contact. With the grounding conductor installed, the spherical sliding contact part that fits and slides in the sliding hole of the grounding conductor at one end, and the sliding contact part at the other end keeps fitting with the sliding hole. Since the fixed contact and the movable contact formed of a spherical contact portion that can come into contact with each other are used, it is possible to provide a gas-insulated switchgear which is easy to assemble as well as being downsized.

[Brief description of drawings]

FIG. 1 is a side view showing a configuration around a circuit breaker of a gas insulated switchgear according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing in detail the configuration of the ground switch in FIG.

FIG. 3 is a cross-sectional view showing in detail the structure of a ground switch of the gas insulated switchgear according to Embodiment 2 of the present invention.

FIG. 4 is a side view showing a configuration around a circuit breaker of a conventional gas insulated switchgear.

[Explanation of symbols]

1 Circuit breaker mounting base, 2 Circuit breaker, 2a Charging part, 3
Operating mechanism, 4 insulating support cylinders, 6 ground switch, 6a
Fixed contact, 6b support frame, 6c ground bushing, 6d ground conductor, 6d ₁ sliding hole, 6e movable contact, 6e ₁ sliding contact part, 6e ₂ contact part, 6f lever.

Front page continuation (72) Inventor Masahiro Yonezawa 8 Horai-cho, Marugame City Marugame Plant, Mitsubishi Electric Corporation (72) Inventor Toshifumi Sato 8 Horai-cho Marugame City, Marugame Plant (72) Invention Person Masashi Uesa 8 Horai-cho, Marugame City Marugame Plant, Mitsubishi Electric Corporation (72) Inventor Masayoshi Nishizaki 8 Horai-cho Marugame City, Marugame Plant, Mitsubishi Electric Corporation

Claims (3)

[Claims] 1. A gas-insulated switchgear comprising a circuit breaker and a pair of grounding switches respectively connected to charging parts at both ends of the circuit breaker, and an insulating support for insulatingly supporting each grounding switch between the charging parts. A gas-insulated switchgear characterized by being housed and arranged in a cylinder, respectively. 2. The grounding switch according to claim 1, wherein the grounding switch is embedded in a fixed contact formed in a charging part of the circuit breaker and a grounding bushing arranged so as to face the fixed contact, and the grounding switch is provided in a central portion. A grounding conductor having a sliding hole extending in a direction away from the fixed contact, a spherical sliding contact portion that fits into the sliding hole of the grounding conductor and slides at one end, and the sliding contact at the other end. A gas-insulated switchgear, wherein the dynamic contact portion is composed of a movable contact formed of a spherical contact portion capable of contacting the fixed contact while maintaining the fitting with the sliding hole. 3. An insulated switchgear comprising a disconnector connected to a busbar and a grounding switch connected to a busbar charging part of the disconnector, wherein the grounding switch is a busbar charging part of the disconnector. A fixed contact to be formed, and a ground conductor embedded in a ground bushing arranged to face the fixed contact and having a sliding hole formed in a central portion thereof and extending in a direction away from the fixed contact. A spherical sliding contact portion that fits into the sliding hole of the ground conductor and slides at one end, and the fixed contact with the sliding contact portion at the other end that keeps fitting with the sliding hole. A gas-insulated switchgear comprising a movable contact formed of a spherical contactable portion.