JPH05325743A - Vacuum circuit breaker - Google Patents

Abstract

PURPOSE:To prevent a small animal from making contact with a main circuit terminal and the charge part of a vacuum valve, when the small animal enters into an insulating frame. CONSTITUTION:In each partitioned chamber in an insulating frame 6 provided with a vacuum valve 1, a charge part cover 11 consisting of a U-shaped insulating material and having a notch part extending through an operation rod 3 is arranged. The opening side end part of the charge part cover 11 is mounted on the insulating frame 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drawer type vacuum circuit breaker having a vacuum valve.

[0002]

2. Description of the Related Art FIG. 5 is a sectional view showing the structure of a conventional vacuum circuit breaker. A main circuit terminal 2 is connected to both ends of the vacuum valve 1, and a movable contact 1A of the vacuum valve 1 is connected to an operating lever 4 via an operating rod 3. Further, the operation lever 4 is configured integrally with the opening / closing shaft 5. The vacuum valve 1 is supported by a support plate 6B projecting from the insulating wall 6A of the insulating frame 6, and the main circuit terminal 2 has the insulating wall 6A.
And is supported by the insulating wall 6A.

In FIG. 5, when the opening / closing shaft 5 is rotated by a driving device (not shown), the operating rod 3 is moved up and down to open / close the contact of the vacuum valve 1. The compression spring 3A is for constantly pressing the operation lever 4 to the lower end side of the operation rod 3. A truck 7 is attached to the insulating frame 6. By moving the insulating frame 6 in the left-right direction in FIG. 5, the main circuit terminal 2 is connected to or disconnected from the main circuit bus bar (not shown) on the left side.

FIG. 6 is a view taken in the direction of arrow P in FIG. The vacuum valves 1 are housed in an insulating frame 6 with three phases arranged side by side.
In the insulating frame 6, an insulating wall 6A that surrounds the three compartments 16 in a U-shape, a support plate 6B that supports the vacuum valve 1, and a cylindrical portion 6C that penetrates the main circuit terminal 2 are integrally made of, for example, polyester resin. Is molded into. An operation unit case 15 is attached to both sides (upper and lower sides in FIG. 6) of the insulating frame 6. A front cover 9 is arranged on the front surface (right side in FIG. 6) of the insulating frame 6 and is bolted to the operation unit case 15. The XX cross section of FIG. 6 corresponds to FIG.

In FIG. 6, an operation device for driving the opening and closing of the vacuum valve 1 is accommodated in an operation device case 15. The open / close shaft 5 shown in FIG. 5 extends from the insulating frame 6 to the operating device case 15 side, and the open / close shaft 5 is rotated by the operating device. Inside the insulating frame 6 is each compartment 16
The reason why the vacuum valve 1 is partitioned is so that even if the vacuum valve 1 is damaged, its influence does not reach other phases.

[0006]

However, in the conventional device as described above, the main circuit terminal and the high voltage charging part of the vacuum valve are exposed in the insulating frame, and a dielectric breakdown accident occurs due to the invasion of small animals. There was a problem that could be. The vacuum circuit breaker is provided with a front cover and an insulating wall of an insulating frame so that a person cannot easily access the charging part during operation. However, small animals such as mice and snakes could easily enter through the gaps in the insulating frame.

In FIG. 5, there is a possibility that a small animal may invade from the upper part or the lower part of the insulating frame 6 along the path indicated by the arrow 10 to pollute the inside of the insulating frame 6 or contact the charging part. The vacuum circuit breaker of FIG. 5 may be wholly housed in a switchboard. However, when the switchboard is not tightly sealed, small animals can easily enter the switchboard. As a result, the gap between the vacuum valve 1 and the ground,
Or, there may be a case where a dielectric breakdown occurs between the phases, which leads to a big problem that the power supply is stopped.

An object of the present invention is to prevent a small animal from contacting the charging part by providing a charging part cover for covering the charging part of the main circuit terminal and the vacuum valve in the insulating frame.

[0009]

In order to achieve the above object, according to the present invention, a plurality of compartments surrounded by an insulating wall in a U shape are formed, and a vacuum valve is installed in the compartments. Then, a vacuum circuit breaker is connected to the electrode of the vacuum valve, to which a main circuit terminal penetrating a part of the insulating wall and drawn into the compartment is connected, and an operating rod for opening and closing the vacuum valve being drawn from the compartment. In the above, the charging section cover made of an insulator is attached to the opening of the compartment, and in such a configuration, the charging section cover is provided with a notch section for pulling out an operation rod for opening and closing the vacuum valve, A through hole through which the operation rod penetrates and a rubber sheet provided with a crack extending from the through hole to the locking portion side of the charging portion cover are provided.

In addition to the above structure, the charging section cover is made of an elastic material and has an L-shaped bent locking portion at its end, and this locking portion is provided on the insulating wall side. The charging part cover is fitted in the hole, and the charging part cover further includes a ventilation hole.

[0011]

According to the structure of the present invention, since the charging portion cover is attached to the opening of the compartment formed in a U-shape by the insulating wall, the vacuum valve portion installed in this compartment, that is, the charging portion. Are covered by this cover, preventing small animals from entering the compartment.

Further, the insulating cover is made of an elastic material and has an L-shaped engaging portion at its end. The charging part cover is locked to the insulating frame by fitting the locking part of the charging part cover into the locking hole provided on the insulating frame side. With this configuration, it is easy to attach the charging section cover to the insulating frame, and the fixing bracket is not required.

Further, a rubber sheet covering the cutout portion of the charging portion cover is fixedly arranged on the charging cover. A through hole is provided at a position where the operation rod of the rubber sheet penetrates.
Further, the rubber sheet is provided with a crevice extending from this through hole to the engaging portion side of the charging portion cover. With this configuration, small animals cannot enter through the cutout portion of the insulating cover, and the cover of the charging portion becomes more complete.

Further, since the charging section cover is provided with the ventilation hole, the temperature rise due to the energization of the main circuit terminal can be suppressed by the cooling effect of the ventilation hole.

[0015]

EXAMPLES The present invention will be described below based on examples.
FIG. 1 is a sectional view showing the structure of a vacuum circuit breaker according to an embodiment of the present invention. The charging section cover 11 is bolted to the insulating wall 6A. Since other configurations are the same as those of the conventional configuration shown in FIG. 5, the same reference numerals are used for the same portions, and detailed description thereof will be omitted. FIG. 2 is a perspective view showing only the charging section cover 11 of FIG. The charging section cover 11 is formed in a U shape and has a cutout section 11A.
Is equipped with. Further, the opening side end of the charging part cover 11 is provided with a locking part 11B bent in an L shape, and a mounting hole 11C for bolting is opened.

As shown in FIG. 1, the notch portion 11A is formed in such a size that the operation lot 3 and the compression spring 3A penetrate therethrough, and has a U-shape so that the charging portion cover 11 can be attached from the right side of the drawing. Is cut out. The width W of the charging unit cover 11 in FIG. 2 is formed to be the full width of each compartment. Since the charging section cover 11 is attached so as to contact the insulating wall 6A, the charging section cover 11 and the insulating wall 6A are attached.
Small animals are not allowed to enter through the gap between. This charging part cover 11 gets in the way, and the small animal is a vacuum valve 1.
It becomes impossible to contact the charging part of the main circuit terminal 2 and
The vicinity of the charged portion of the insulating frame 1 is not polluted.

FIG. 3 is a sectional view showing the structure of a vacuum circuit breaker according to another embodiment of the present invention. The U-shaped insulating cover 12 is provided with a locking portion 12B bent in an L-shape at its opening side end portion, and is fitted into a locking hole 14 provided in the insulating wall 6A. A rubber sheet 13 is provided below the charging unit cover 12. The other structure is the same as that of FIG. In FIG. 4, the charging section cover 12 of FIG. 2 is provided with a cutout section 12A and a locking section 12B similar to those of FIG. The width W of the charging section cover 12 is formed to be the same as the width of each compartment as described above. In addition, the rubber sheet 13 covers the notch portion 12A and the charging portion cover 12
Affixed to. The rubber sheet 13 includes a through hole 13B, the through hole 13B, and a crack 13A extending from the through hole 13B toward the locking portion 12B. Further, the charging section cover 12 is provided with a ventilation hole 12D having many small holes penetrating therethrough.

The charging section cover 12 is made of an elastic material. In FIG. 3, both ends of the charging cover 12 on the opening side are pressed inward from above and below by hand, and the locking portion 1 is inserted into the locking hole 14 of the insulating wall 6A with the opening width slightly reduced.
Penetrate 2B. When the pressing of the charging section cover 12 is released, the charging section cover 12 is locked to the insulating wall 6A. The charging section cover 12 is formed of, for example, polyester resin.
Any material with a thickness of a few millimeters or less is usually elastic.

A rubber sheet 1 is provided below the charging section cover 12.
Since there are three cracks 13A, the operation rod 3 and the compression spring 3 are temporarily opened.
A fits into the through hole 13B of the rubber sheet 13. If the diameter of the through hole 13B is set to be substantially the same as that of the compression spring 3A, small animals cannot enter even from the cutout portion 12A of the charging portion cover 12. Even if the compression spring 3A comes into contact with the rubber sheet 13, the elasticity of the rubber sheet 13 prevents the operation function of the compression spring 3A from being hindered. Ventilation hole 1 on the charging part cover 12
Since 2D is provided, heat generation due to the current flowing through the main circuit terminal 2 can be suppressed. The ventilation hole 12D should be a collection of holes with a diameter as small as possible so that small animals do not enter from it, for example, by inserting an insulating mesh plate with fine mesh holes into the charging unit cover 12, or by charging the charging unit. A method such as making a large number of fine round holes in the cover 12 is used.

[0020]

As described above, according to the present invention, the charging section cover, which is made of a U-shaped insulator and has the notch through which the operating rod penetrates, is attached to the opening of each compartment of the insulating frame. A vacuum valve is stored in the compartment. With this configuration, since the charging part is covered, it is difficult for small animals to come into contact with the charging part, and an insulation accident does not occur.

The charging section cover is provided with a notch for drawing out the operating rod for opening and closing the vacuum valve. The notch has a through hole through which the operating rod penetrates, and the engaging section of the charging section cover through this through hole. It is covered with a rubber sheet provided with a crack extending to the stop side. This prevents small animals from entering this part as well, and the cover of the charging part becomes more complete.

Further, the charging section cover is formed of an elastic material and has an L-shaped locking portion at the opening side end portion, and the locking portion is fitted into a locking hole provided in the insulating frame. Since the charging section cover is locked to the insulating frame by fitting the charging section cover, the charging section cover can be easily attached to the insulating frame, and no fixing metal fitting is required, so that the charging cost of the charging section cover can be reduced. Further, since the charging section cover is provided with the ventilation hole, the temperature rise due to energization of the main circuit terminal is suppressed by the cooling effect of the ventilation hole, and the charging section cover can be attached to a large capacity vacuum circuit breaker.

[Brief description of drawings]

FIG. 1 is a sectional view showing the structure of a vacuum circuit breaker according to an embodiment of the present invention.

FIG. 2 is a perspective view showing only the charging section cover shown in FIG.

FIG. 3 is a sectional view showing the structure of a vacuum circuit breaker according to another embodiment of the present invention.

FIG. 4 is a perspective view showing only the charging section cover shown in FIG.

FIG. 5 is a sectional view showing the structure of a conventional vacuum circuit breaker.

FIG. 6 is a view on arrow P of FIG.

[Explanation of symbols]

 1 vacuum valve 2 main circuit terminal 3 operation rod 3A compression spring 4 operation lever 5 opening / closing shaft 6 insulating frame 6A insulating wall 6B support plate 6C cylindrical part 7 bogie 9 front cover 11 charging part cover 12 charging part cover 11A notch part 12A cutting Notch portion 11B Locking portion 12B Locking portion 11C Mounting hole 12D Ventilation hole 13 Rubber sheet 13A Crack 13B Through hole 14 Locking hole 15 Operator case 16 Compartment

Claims (5)

[Claims] 1. A plurality of compartments surrounded by an insulating wall in a U shape are formed, a vacuum valve is installed in the compartments, and the electrodes of the vacuum valve penetrate a part of the insulating wall. In a vacuum circuit breaker in which a main circuit terminal drawn into a compartment is connected and an operation rod for opening and closing the vacuum valve is drawn from the compartment, a charging section cover made of an insulator is attached to an opening of the compartment. A vacuum circuit breaker characterized by that. 2. The vacuum circuit breaker according to claim 1, wherein the charging section cover is provided with a cutout section for pulling out an operation rod for opening and closing the vacuum valve. 3. The method according to claim 1 or 2, wherein
The charging section cover has a cutout portion for pulling out the operation rod of the vacuum valve, a through hole through which the operation rod penetrates, and a crack extending from the through hole to the locking portion side of the charging section cover. A vacuum circuit breaker, comprising: a rubber sheet provided. 4. The charging section cover according to claim 1, wherein the charging section cover is formed of an elastic material, and has an L-shaped bent engaging portion at an end thereof. Is fitted into a locking hole provided on the insulating wall side. 5. The vacuum circuit breaker according to claim 1, wherein the charging section cover has a ventilation hole.