JPH0520979A - Vacuum circuit breaker - Google Patents

Abstract

PURPOSE:To reduce the quantity of components and provide a vacuum circuit breaker having high current interruption capability. CONSTITUTION:Short rings 61 are jointed to movable conductors 15 led out after connection to the movable electrodes 14 of vacuum circuit breakers 1 and 2. In addition, there are provided electromagnetic resilient coils 60 to apply an electromagnetic resilient force to the short rings 60 as an operation force acting in a direction for current interruption. The coils 60 are so arranged near the vacuum circuit breakers 1 and 2 as to give parallel magnetic field to arc generated between a stationary electrode 16 and the movable electrode 14 parting therefrom.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum circuit breaker, and more particularly to a vacuum circuit breaker which is driven to open by utilizing an electromagnetic repulsive force generated by an electromagnetic repulsive coil.

[0002]

2. Description of the Related Art Generally, a vacuum circuit breaker is composed of a vacuum valve having a pair of separable electrodes in a vacuum container and an operating mechanism for driving a movable electrode of these electrodes to open and close. Therefore, various improvements have been made to improve the breaking performance. For example, in the vacuum circuit breaker disclosed in Japanese Examined Patent Publication No. 54-22813, a magnetic field generating coil that applies a magnetic field parallel to the arc generated between the separated electrodes when the current is cut off is provided, This magnetic field generating coil improves the breaking performance. Further, Japanese Patent Application Laid-Open No. 59-242022 discloses a combination of an electromagnetic repulsion coil and a short ring as the above-mentioned operation mechanism. The electromagnetic repulsion force generated by energizing the electromagnetic repulsion coil drives the short ring, and a link mechanism is formed. There is shown a vacuum circuit breaker adapted to open a movable electrode which is connected via a short ring.

[0003]

However, as described above, the conventional vacuum circuit breaker must be provided with a dedicated magnetic field generating coil for applying a parallel magnetic field to the arc in order to improve the breaking performance. It complicates the configuration or increases the size. Also, even when using an electromagnetic repulsion coil that has excellent responsiveness and a large operating force with a relatively simple structure, this electromagnetic repulsion coil is arranged on the operating mechanism side and transmits the operating force to the movable electrode via the link mechanism. Therefore, the weight of the movable part, that is, the load on the operating force is increased due to the link mechanism or the like existing on the way, and it is impossible to expect a sufficiently high speed opening.

An object of the present invention is to provide a vacuum circuit breaker which has a reduced number of mechanical parts and has an excellent breaking performance.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention connects a short ring to a movable conductor of a vacuum valve, opposes the short ring, and prevents an arc generated when the electrodes are separated from each other. An electromagnetic repulsion coil is provided at a position where a parallel magnetic field is applied.

[0006]

Since the vacuum circuit breaker according to the present invention has the above-described structure, an electromagnetic repulsive force is generated and an operating force is obtained, and a magnetic field is generated by the electromagnetic repulsive coil at this time.
Since this magnetic field becomes a parallel magnetic field with respect to the arc, the electromagnetic repulsion coil for generating the operating force can improve the breaking performance. That is, as a result, the conventional dedicated magnetic field generating coil can be omitted, so that the number of parts can be reduced and the size can be reduced. Moreover, by disposing the electromagnetic repulsion coil in the vicinity of the vacuum valve so as to give a parallel magnetic field to the arc, it is possible to reduce the number of components between the shoot ring and the movable electrode, so that the load against the electromagnetic repulsion force is reduced. High-speed opening can be performed by reducing it.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a vertical cross-sectional front view of a vacuum circuit breaker according to an embodiment of the present invention, in which two vacuum valves 1 and 2 connected in series constitute two series disconnection points.
Have almost the same configuration, only one will be described in detail.

Both ends of the insulating cylinder 10 are hermetically sealed by a movable side end cover 11 and a fixed side end cover 13, and the movable side end cover 1
The movable electrode 14 is attached to the movable-side conductor 15 introduced from 1 through the bellows 12, and the fixed electrode 16 is attached to the fixed-side conductor 17 introduced from the fixed-side end cover 13 to vacuum the inside of the vacuum valve 1. Is configured. 1 is a vertical side view of the vacuum valve 1 housed in a U-shaped insulating case 50 having vertical walls 50a and 50b on the opposite side and the opposite side of the vacuum valve 2 from the vacuum valve 1, respectively. As shown in FIG. 2, it is supported and fixed to the mechanism case 3 via the insulating case 50. A conductor 53 is fixed to the upper end of the insulating case 50, and the movable side conductor 15 and the conductor 53 are electrically connected in a slidable relationship via a sliding contact 54 incorporated in the conductor 53. As shown in FIG. 2, this conductor 53 constitutes one terminal. An electromagnetic repulsion coil 60, which is electrically insulated from the movable-side conductor 15 and is connected to a power source (not shown), is attached above the conductor 53. A short ring 61, which is a one-turn coil made of copper or the like and connected to the movable conductor 15, is arranged. The movable conductor 15 is connected to the spring case 64 by a connecting pin 63 with a spring 65 interposed between the upper end of the movable conductor 15 and the spring case 64. The spring case 64 is connected to one end of a lever 67 shown in FIG. 2 via an insulating rod 66, and the other end of the lever 67 is connected to the operating device 4 whose details are omitted. The electromagnetic repulsion coil 60, the short ring 61, the operation device 4, and the like described above constitute an operation device that opens and closes the movable electrode 14.

The fixed-side conductor 17 of the vacuum valve 1 is connected to a connecting conductor 52 whose one end is supported on the bottom of the insulating case 50. The connecting conductor 52 extends to the rear of the insulating case 50 as shown in FIG. 2, and thereafter, is raised upward between the vacuum valves 1 and 2 at the position of the rear, and the adjacent vacuum valve 2
The other end is fixed to the upper end of the insulating case 50 for housing the. The other end of the connection conductor 52 is electrically connected to the movable-side conductor 15 via a sliding contact 54 in a slidable relationship. The fixed-side conductor 17 of the vacuum valve 2 is connected to the conductor 51, and this conductor 51 constitutes the other terminal as shown in FIG. Other configurations on the side of the vacuum valve 2 are the same as those on the side of the vacuum valve 1, and therefore description thereof will be omitted.

One of the features of this construction is that two vacuum valves 1 and 2 are connected in series to form a plurality of breaking points, and the opening repulsion force is generated by the electromagnetic repulsion coil 60 and the shatter ring 61. It is in the point used. Since the two vacuum valves 1 and 2 are used in this way, the weight of the movable part can be reduced as compared with the case where one vacuum valve having a double capacity is used. The repulsion coil 60 can be downsized. Another feature is the position of the electromagnetic repulsion coil 60 and its function. That is, as shown in FIG. 3 which shows a state in which a current is applied to the electromagnetic repulsion coil 60, the electromagnetic repulsion coil 60 generates a magnetic flux as indicated by an arrow indicated by a solid line or a dotted line. Can improve the breaking performance by obtaining a parallel magnetic field with respect to the arc generated between the separated electrodes without interfering with each other. In other words, both electromagnetic repulsion coils 60, which are provided to generate the breaking operation force, are also used for improving the breaking performance by arranging the positions and the number of turns so as to act as a parallel magnetic field on the arc between the electrodes. However, a vacuum circuit breaker with excellent breaking performance can be obtained with a small number of components. Further, since the electromagnetic repulsion coil 60 and the short ring 61 are arranged in the vicinity of the vacuum valves 1 and 2, the electromagnetic repulsion force drives the short ring 61 at a high speed in the blocking direction, and at least a part of the moving amount at this time is caused by the spring 65. If the electromagnetic repulsion coil 60 is absorbed and then the operation device 4 side is operated relatively slowly in the shut-off direction, the electromagnetic repulsion coil 60 is moved.
It is possible to reduce a substantial load against the electromagnetic repulsive force as compared with the case of providing the side.

4 and 5 are a vertical sectional front view and a vertical sectional side view of a vacuum circuit breaker according to another embodiment of the present invention. The difference from the previous embodiment is the configuration in which the two vacuum valves 1 and 2 are electrically connected in series, and this part will be described.

Vacuum valves 1 and 2 having the same structure as the previous embodiment
Is housed in the insulating case 50, and the electromagnetic repulsion coil 60 is fixed to the metal fitting 21 fixed to the upper end of the insulating case 50. The short ring 61 that forms a pair with the electromagnetic repulsion coil 60 is connected to the movable conductor 15, and the movable conductors 15 of both vacuum valves 1 and 2 in the vicinity thereof are electrically connected by a connection conductor 56. Both terminals of the two vacuum valves 1 and 2 connected in series are respectively constituted by the conductor 57 connected to the fixed-side conductor 17 as shown in FIG. 5, and as a result, the current path as a whole is It has an inverted U shape. Therefore, when a large current such as a short-circuit current flows, the connecting conductor 56 is formed by the above-mentioned configuration of the inverted U-shaped current path.
An electromagnetic force is generated to drive the above in the shut-off direction. At the same time, when a shutoff command is given to energize the electromagnetic repulsion coil 60, an electromagnetic repulsive force for driving the short ring 61 in the shutoff direction is added, and the vacuum valves 1 and 2 can be opened at a higher speed. it can.

In the above embodiment, the case where the two vacuum valves 1 and 2 are electrically connected in series has been described, but a vacuum circuit breaker using only one vacuum valve 1,
For example, even if the vacuum valve 2 and the connecting conductor 52 shown in FIG. 1 are excluded, a parallel magnetic field is generated against the arc between the electrodes as shown in FIG. 3 by using the electromagnetic repulsion coil 60 provided for the breaking operation. It is possible to improve the breaking performance with a small number of components.

[0014]

As described above, according to the present invention, the electromagnetic repulsion coil for generating the electromagnetic repulsion force which becomes the breaking operation force is provided in the vicinity of the vacuum valve, and the magnetic field generated by the electromagnetic repulsion coil is applied between the electrodes. Since the magnetic field is parallel to the arc, the electromagnetic repulsion coil is used both for the breaking operation and for improving the breaking performance, and a vacuum circuit breaker with excellent breaking performance can be obtained with a small number of parts.

[Brief description of drawings]

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

FIG. 2 is a vertical sectional side view of the vacuum circuit breaker shown in FIG.

3 is a vertical cross-sectional front view of the vacuum circuit breaker in which the directions of magnetic flux generated by the electromagnetic repulsion coil shown in FIG. 1 are also shown.

FIG. 4 is a vertical sectional front view showing a vacuum circuit breaker according to another embodiment of the present invention.

5 is a vertical cross-sectional side view of the vacuum circuit breaker shown in FIG.

[Explanation of symbols] 1 vacuum valve 2 vacuum valve 14 movable electrode 15 Movable conductor 16 fixed electrode 17 Fixed side conductor 52 Connection conductor 56 Connection conductor 60 Electromagnetic repulsion coil 61 short ring

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Koya Yamada             1-1-1 Kokubuncho, Hitachi-shi, Ibaraki Stock             Hitachi, Ltd. Kokubu factory (72) Inventor Kei Ichinose             1-1-1 Kokubuncho, Hitachi-shi, Ibaraki Stock             Hitachi, Ltd. Kokubu factory

Claims (5)

[Claims] 1. A vacuum circuit breaker comprising a movable electrode and a fixed electrode, which are arranged to face each other, and a movable-side conductor connected to the movable electrode and led out to the outside, in a vacuum circuit breaker, wherein the movable electrode and the fixed electrode are fixed. An electromagnetic repulsion coil is provided at a position that gives a parallel magnetic field to the arc generated between the electrodes.
A vacuum circuit breaker connected to the movable conductor and provided with a short ring facing the electromagnetic repulsion coil. 2. At least two vacuum valves each having a movable electrode and a fixed electrode facing each other and a movable conductor connected to the movable electrode and led out to the outside are provided.
In a vacuum circuit breaker in which individual vacuum valves are electrically connected in series by connecting conductors, parallel magnetic fields are applied to arcs generated between the movable electrode and the fixed electrode of both vacuum valves. A vacuum circuit breaker characterized in that electromagnetic repulsion coils are arranged at respective positions, each of which is connected to each of the movable side conductors and a shoot ring is provided so as to face each of the electromagnetic repulsion coils. 3. The vacuum circuit breaker according to claim 2, wherein the two electromagnetic repulsion coils are arranged so that directions of magnetic fluxes thereof are the same. 4. The vacuum valve according to claim 2, wherein the two vacuum valves are arranged in parallel so that the moving-out conductors are oriented in the same direction, and are connected to the fixed electrode of one of the vacuum valves to the outside. A vacuum circuit breaker, characterized in that the fixed side conductor that has been led out and the movable side conductor located outside the other vacuum valve are connected by the connection conductor. 5. The two vacuum valves according to claim 2, wherein the two vacuum valves are juxtaposed with their moving-out conductors aligned with each other in a derivation direction, and between the movable conductors positioned outside the two vacuum valves. A vacuum circuit breaker, characterized in that: