JPS5920933A - Vacuum switch - 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] This invention is! ■It's about empty switches,
More specifically, the present invention relates to a vacuum switch in which a fixed electrode and a movable electrode are housed in a vacuum container and move toward and away from each other.

Conventionally, there has been a vacuum switch of this type as shown in Fig. 1. In the figure, a fixed electrode is fixed and housed on the l side of the vacuum container /, and a movable electrode 3 facing the fixed electrode is connected and supported by a bellows V to the vacuum container l. The bellows cover S protects the inner wall of the vacuum vessel l from the plasma generated between the electrodes together with the axe shield cover 6.7.

The side wall /a of the main body B/ is made of a strong insulator such as glass or hemi-lamic.

With the above configuration, normally the fixed electrode 3 and the movable electrode 3 are welded, and a current flows between the two electrodes, but if an accident occurs in the circuit connected to this vacuum switch, the current is immediately cut off. When it becomes necessary to do so, move the movable electrode 3 in the direction of the arrow to open the circuit.

At this time of opening, plasma P is generated between both electrodes.

If the amount of plasma generated at this time is small, the current is cut off when the voltage applied between the electrodes 100 becomes very low, and the circuit is completely opened.

Conventional devices have the above configuration, and a large amount of energy is input into the plasma generated between the electrodes. This is because the voltage applied between the electrodes increases because the plasma is unstable. Therefore, there was a drawback that the electrodes were seriously damaged by the plasma and the life of the vacuum switch was shortened.

The main object of this invention is to provide an empty switch based on the above (a) long-life electrode.

The purpose of this invention is to create several shells on the outside of a vacuum container, and to flow a current through these shells in the opposite direction to the current flowing through the electrodes in the center, thereby generating magnetic flux generated by plasma. It is an object of the present invention to provide a vacuum switch configured to confine the plasma and to return the plasma to the center by electromagnetic repulsion when the plasma approaches the wall of the vacuum container.

An embodiment of the present invention will be described below with reference to FIG.

A current flows between the fixed electrode 3 and the movable electrode 3 in the direction of arrow B through plasma P. The movable electrode J can move through the bellows l in a conventional manner. Place several stabilizing conductor walls (hereinafter referred to as shells 5) to confine the magnetic field generated by the plasma P on the outside of the vacuum vessel// that houses these electrode units 3. Shell g and fixed-electrode are conductors? connected with. The lower end of the shell is connected to the drawer solenoid/Q. The bellows cover is on the left. Shell and extraction electrode 10. Copper and aluminum, which have good conductivity, are used for the conductor. 〃” company employee = gnat→゛′
- With the above configuration, the arrow B flows in the order of movable electrode 3 → plasma P → fixed electrode λ? 6') In response to the current, a current flows in the shell g in the direction of the arrow B' in the opposite direction, thus effectively suppressing the growth of instability in the plasma P. This is because when the plasma P is deformed and moves toward the wall of the vacuum chamber, the coupling improves, the current flowing through that wall increases, and the repulsive force increases, trying to return the plasma to its original position. Because it does. It's a shell plasma K
Since the magnetic flux associated with the flowing current is conserved, this a) stabilizes the plasma. As a result, the electrode.

The voltage across J decreases.

In addition, as shown in FIG. 1, various connections between the fixed electrode and the shell are conceivable in order to allow current i to flow in the shell g in the opposite direction to that in the electrode. In fact, it is conceivable that the extraction electrode /θ is inverted and extended again toward the fixed electrode λ side.

FIG. 3 shows another embodiment in which a vacuum vessel L containing a fixed electrode, a movable type (Y3), and a shell GA1 divided into λ
This is intended to combine and assemble gb, and has the same effect.

FIG. V shows yet another embodiment, in which a constriction part /a is formed in a region surrounding the plasma P of the vacuum vessel /, and several shells t are inserted in this constriction part /a. The bending configuration allows the plasma to be stabilized and the shells to be brought close to each other, thereby further improving the plasma stabilizing effect by the shell g.

As is clear from the above explanation, the present invention can stabilize the plasma, lower the inter-electrode voltage, and reduce the energy flowing into the plasma, thereby minimizing damage to the electrodes.
This has the effect of improving the durability of the vacuum switch.

In addition, since the shell is placed around the outer periphery of the vacuum container, it is possible to
It is easy to assemble and also has the same construction as shown in Figure 1.
111. The L structure reduces the inductance of the vacuum switch and can be used in circuits with small inductance.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a conventional device, Fig. 1 is a longitudinal sectional view of one embodiment of the present invention, and Fig. 3 is a main part of another embodiment! II flFf perspective view, FIG. 1 is also a longitudinal sectional view of yet another embodiment. l...vacuum container, /a...narrowed part, knee/fixed electrode,
3... Movable electrode, G... Bellows, Left... Bellows cover, g, ga, gb... Shell, ?・・Conductor, /θ・
・Extraction electrode. In each figure, the same reference numerals indicate the same or corresponding parts. Agent Shin Kuzuno - Coffin Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] (1) A vacuum container containing a fixed electrode and a movable electrode, a stabilizing conductor wall disposed around the outer periphery of the vacuum container, and a current in the opposite direction to the current flowing in the plasma generated when the two electrodes are opened. A vacuum switch comprising means for electrically connecting one of the fixed electrode and the movable electrode to one end of the stabilizing conductor wall so that the flow flows to the stabilizing conductor wall. (,7) The vacuum switch according to claim 1, wherein both ends of the stabilizing conductor wall are Ig-connected to the fixed electrode and the lead-out conductor via conductors, respectively.