JPS5918533A - Vacuum breaker - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] This patent is aimed at increasing the capacity of a vacuum breaker (2) In particular, in addition to the vacuum pulp itself, a vacuum breaker in which a coiled electrode is installed also on the outside of the vacuum container is disclosed. Concerning vessels.

[Background technology and its problems]

As is well known, vacuum pulp for 1U vacuum breaker is produced in an atmosphere with a high vacuum of at least 10 Torr or less.
By separating the electrodes, the excellent insulation properties of vacuum,
By the way, as shown in FIG.
, and the movable end plate 4 to form an airtight container, and the inside thereof is evacuated to a high vacuum C of 10-' Torr or less. A fixed electrode shaft 6 supporting a fixed electrode 5 is supported and fixed on the fixed end plate 3, and a movable electrode 7 is provided opposite to the fixed electrode 5.
A movable electrode shaft 8 is connected to an external operating mechanism (not shown).
It is supported by I=. Furthermore, the movable electrode shaft 8 can operate while maintaining the degree of vacuum within the insulating outer cylinder 2 by means of metal bellows 9, each of which has an airtight connection to the open end of the movable end plate 4. Further, a bellows cover 10 is provided to surround the bellows 9 for the purpose of protecting the metal bellows 9 from tfφ from the metal particles coming between the electrodes 5 and 7. Also, due to arcing when the current is cut off, the electrode 5
A shield 11 is provided for the purpose of preventing the inner surface of the insulating outer cylinder 2 from becoming contaminated due to adhesion of metal vapor generated and diffused from the insulating material outer cylinder 2.

In a vacuum breaker having such a configuration, during normal operation, the electrodes 5 and 7 are in a contact state (there are two), and when the electrode shaft 8 is moved from this state by the operation of an operation mechanism (not shown), the electrode 7 is moved. A C near arc is generated between the electrodes 5 and 7, separated from the electrode 5. This arc is maintained by the generation of metal vapor from the cathode, e.g. electrode 7, and when the current reaches zero point, the generation of metal vapor stops. At the correct size, the arc can no longer be maintained and the cutoff is completed.

The arc that occurs between the electrical connections 5 and 7 is cut off, and when the current increases, the interaction between the magnetic field generated by the arc itself and the magnetic field created by the external circuit causes a state that is extremely unstable. becomes. Therefore, the arc moves on the electrode surface,
The ends of the electrodes are biased toward the fibers, which become locally overheated and release multiple metal vapors, lowering the cut-off limit.

It is already known that applying a magnetic field in a direction perpendicular to the electrode surface 1 is effective as a means to prevent such a phenomenon, and various methods and configurations have been developed. FIG. 1 shows a coil 13 installed on the outer periphery of an insulating outer cylinder 2. A magnetic field 14 is applied by a coil 13 to the arc between the electrodes 5 and 7, so that the arc is appropriately controlled and exhibits great breaking performance. coil 1
3 and the movable electrode shaft 8 are connected by a flexible current-carrying conductor 15.

Since it is desirable that the magnetic field applied between the electrodes has a uniform strength over the entire radial direction, 13 coils are used, and one coil 13 is placed in the same plane as the center position of the vacuum valve, that is, the middle position of the electrodes 5°7. Generally, the center of the However, as the operating voltage of the vacuum valve increases, for example in the case shown in Figure 1, 1r(I
The insulation distance between the leg end plate 3 and the coil 13 is short, which may cause insulation problems. Therefore, in the case of high voltage applications, it is conceivable to arrange the coil 13 so as to be shifted toward the movable end plate 4. However, it is clear that when the coil 13 is shifted from its center position in this way, the magnetic field strength becomes non-uniform. Furthermore, when the inter-electrode spacing is wide, this non-uniformity applies a larger potash and magnetic field (despite this, it is expected that the breaking performance will not change much).

[Purpose of the invention]

The present invention has been designed with these considerations in mind, and even when the magnetic field generating coil installed outside the vacuum vessel is closer to the end plate side than the center of the vacuum bulb, the inter-electrode gap (2 is uniform). The purpose is to provide a vacuum shield 7 and a disconnector that improve the interrupting performance by creating a strong magnetic field distribution.

[Summary of the invention]

In order to achieve this object, according to the present invention, a coil electrode for generating a magnetic field is arranged on the back part 1 of the electrode on the side far from the coil among the opposing electrodes in the vacuum container.

[Embodiments of the invention]

Below is a specific example of the present invention! @2 This will be explained with reference to Figure 2. FIG. 2 shows the breaker of the present invention in its open state.

The coil 13 is installed on the outer periphery of the insulating outer cylinder 2 near the movable end plate 14. The magnetic field generated by this coil 13 has a distribution state as shown by the two points 17 in FIG. This causes non-uniformity in the potash magnetic field distribution, which is stronger than the magnetic field in the space near the fixed electrode 5.In order to correct this, a magnetic field is installed behind the electrode 5, as known from Japanese Patent Publication No. 54-22813. By attaching a coiled electrode 16 to the fixed electrode 5 side where the magnetic field is weaker, it is possible to strengthen the magnetic field strength by the amount of the weaker magnetic field compared to the positive side and to achieve a uniform distribution f.This coiled electrode 16 The dotted line 14 shows the state of the magnetic field when the magnetic field is made uniform by attaching the coil 13 to the space between the electrodes 5 and 7, as if it were located at the center of the valve. It is possible to provide a vacuum breaker that can obtain a magnetic field with a distribution similar to that of the vacuum breaker that has high breaking performance and can be used even at high voltages.

[Other Examples]

FIG. 3 shows another embodiment of the invention. Since the coil 13□ has a long current bus, it may generate heat when energized, which may be inconvenient. In this embodiment C2, the operating rod 22 is driven by an external operating mechanism (not shown), and when the breaker is turned on, when the electrode 517 is turned on, the ζ2 armature 21 is also moved, and the terminal 23 This shows a structure in which the coil 13 is returned by short-circuiting .24 and no current is supplied to the coil 13. Thereby, generation of heat in the coil 13 can be suppressed. 1.9, 20.25 are
The terminal 18 is a conductor for causing a self-action on the terminal 18, and the terminal 18 is a terminal for connection with the outside. Illustrations 1~
As shown in the figure, the short circuit between the terminals 23 and 24 is broken due to the movement of the slider 24, and current can be supplied to the coil 13. From this, an appropriate magnetic field can be applied. .

〔effect〕

As explained above, according to the present invention, the electrodes disposed on the outer periphery of the vacuum container, which are opposed to each other in the vacuum container,
The coil electric contact for magnetic field generation is placed on the back of the electrode on the side far from the cable, which solves the insulation problem and provides a uniform magnetic field. A vacuum breaker can be provided. □

[Brief explanation of drawings]

Fig. 1 is a cross-sectional view showing a conventional vacuum valve for vacuum disconnection when it is open, Fig. 2 is a cross-sectional view showing one embodiment of the present invention, and Fig. 3 is another embodiment of the present invention. FIG. 2 is a cross-sectional view showing an example pulp for vacuum and disconnection. 1... Vacuum pulp 2... Outer cylinder made of insulator 3...
・Fixed side end plate 4... Movable side end plate 5.7... Electrode 6, 8... Electrode shaft 9... Bellows
10...Bellows cover 11...Shield
13... Coils 15.19, 20.25... Conductor 16... Fixed side coil electrode 18... External connection terminal 21... Slider 22...
Operating rods 23, 24...Terminals (7317) Agent Patent attorney Noriyuki Chika (and 1 other person) Figure 1! Figure 2 1 Figure 3

Claims (1)

[Scope of Claims] 1. In a vacuum container having a pair of separable opposing electrodes to cut off an electric circuit, 2. When the current is cut off, 1. An arc generated between the electrodes ( Two coiled electrodes for generating two magnetic fields in parallel directions C are arranged in the vacuum vessel f2 and electrically connected to one electrode back C of the opposing electrodes, and A vacuum breaker characterized by having g-coils on the other electrode side arranged concentrically, and this coil being f-coupled so that it is electrically connected to the other electrode.2. When there is C2,
It is short-circuited by the slider C2 connected to the movable shaft that drives the movable side electrode, and when the pole is opened, the short circuit of the coil is released by the movement of the slider C2, so that current flows through the coil and generates a magnetic field. A vacuum breaker according to claim 1.