JPS62234827A - 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 [Field of Industrial Application] The present invention relates to a switch, and particularly to an improvement in its breaking performance.

[Conventional Technique 14i7] In order to improve the shutoff performance, there is a switch that is structured to blow arc-extinguishing gas when shutting off. Example 5
Figure 6 shown in the figure shows the input state. In this state, the fixed contact 2 and the movable contact 3 are in contact with each other.

In the breaking operation, the movable contact 3 is moved in the direction of arrow A by an operating mechanism (not shown).

When the fixed contact 2 and the movable contact 3 are separated, an arc is generated between them. This arc causes the gas inside the container 1 to become under high pressure. When the NO force f is further applied, the #105 horizontal hole 5a provided in the movable contactor 3 communicates the inside of the container 1 with the outer chamber 6. Therefore, the arc extinguishing gas is blown onto the arc and the arc is extinguished.

[Problems to be Solved by the Invention] However, the conventional switch has the following problems.

In the small current region where the arc current is up to several KA, the increase in gas pressure in the container due to the arc is small, so the arc-extinguishing gas is not blown sufficiently, and sufficient arc-extinguishing ability cannot be obtained. It has been difficult to use conventional switches in the current range. Even in the small current range, it has been particularly difficult to apply to high voltage circuits. This is because in a high-voltage circuit, the re-electromotive voltage becomes high, making it difficult to cut the arc.

On the other hand, in a large current region, the gas pressure inside the container 57 is sufficient. However, since the arc space is limited, the gas in this space becomes extremely high temperature, which thermally decomposes the gas and induces ionization, which causes a problem in that the arc extinguishing performance deteriorates.

The object of the present invention is to solve the above-mentioned problems and obtain a switch having excellent breaking performance regardless of whether the current is small or large.

[Means for solving the problem] The switch according to the present invention has a fixed contactor 'i'iT*
An arc runner is provided near at least one of the jJ contacts, and a magnetic field generating means is provided near the arc runner to generate a magnetic field.

[Operation] When the movable contact moves away from the fixed contact during the breaking operation, an arc is generated between the two. This arc is commutated to the arc runner. Furthermore, this arc is extended and driven by the magnetic flux generated by the magnetic field generating means. Therefore, as the arc moves, it comes into contact with fresh, low-temperature gas and activates the action of increasing gas pressure. Furthermore, this magnetic flux causes the arc to move near the outer periphery of the container, thereby suppressing the temperature of the gas in the center.

[Embodiment] An embodiment of the present invention is shown in FIG. 1, and a container 1 is composed of a flange 1a and an enclosure 1b. An arc runner 30 made of a conductive material is fixed to the enclosure lb. One end of the coil 32, which is a magnetic field generating means, is connected to the arc runner 30, and the other end is connected to the 7 langes 1a. Further, in this embodiment, an arc control device 40 is provided within the container 1.

Next, the operation of this switch will be explained using FIG.

In the breaking operation, the movable contact 3 is moved in the direction of arrow A by an operation a mechanism (not shown). When the movable contact 3 separates from the fixed contact 2, an arc occurs. This arc is commutated to arc runner 30. That is, the arc moves between the movable contactor 3 and the arc runner 30. Therefore, the flange 1a, the coil 32, the arc runner 30, and the arc.

An electric path is formed along the path of the movable contactor 3, and the coil 32 generates magnetic flux. This magnetic flux causes the arc to move outside the arc runner 30. Due to the movement of the arc, the arc comes into contact with fresh low-temperature gas, increasing the effect of increasing gas pressure. This is because cold gas expands more than hot gas. Moved arc control device 4
0 effectively extinguishes the arc. Furthermore, since the arc is stretched by the magnetic flux, the increase in gas pressure can be further increased.

Furthermore, since the arc is moved to the outside of the arc runner 30, the center area will not become excessively hot due to the arc, and therefore the arc will not become sluggish due to gas ionization.

A high-pressure arc-extinguishing gas is blown onto the arc to extinguish it.

In this embodiment, since the arc control bag W1 and the arm #t40 are provided, the arc extinguishing power is excellent. Further, since the vicinity of the orifice 8 of the enclosure 1b is formed in an inverted circular IE shape, the arc that has moved to the outside is also well cooled.

Figure 2 shows the arc control device 4 used in this example.
0, the substrate 40a is provided with an arc extinguishing plate 40b that is inclined with respect to the arc driving direction E. Details of the arc-extinguishing plate 40b are shown in FIG.

In the figure, 40c is a slit.

When the rotationally driven arc contacts the arc-extinguishing plate 40b due to the rotational movement, it is guided along the inclination of the arc-extinguishing plate 40b in a direction in which the radius of rotation becomes larger. This causes a pressure increasing effect due to the elongation of the arc itself. Also, if the arc is
A pressure increasing effect also occurs due to the generation of gas upon contact with 0b. In other words, the increase in gas pressure inside the container is simply caused by the heat W of the gas.
It is formed not only by B tension but also by sublimation gas generated from the arc-extinguishing plate 40b. Furthermore, arc extinguishing plate 40
Since the arc is subjected to a strong arc-extinguishing action when passing through the narrow gap 40c of b, the arc-extinguishing force can be increased by synergizing with the action.

FIG. 11 shows an arc control device 40 in a pond embodiment, in this embodiment on a substrate 40a: li'
4-[Effects of the invention].

The switch according to the present invention includes magnetic field generating means to generate a magnetic field near the arc runner.

Therefore, it has the following effects.

First, as the arc moves from the inner end to the outer OH, it is always in contact with fresh cold gas. For this reason, it is superior to conventional products, perhaps due to the effect of increasing gas pressure.

Second, since the arc is extended to the outside O11, the effect of increasing gas pressure is further improved.

Thirdly, since the arc does not remain in the center, the center does not become hot, and the gas in the center does not become ionized, so the arc cuts better.

That is, even in a small current region where a sufficient increase in gas pressure cannot be obtained, good interrupting characteristics can be obtained.

Furthermore, good cutoff characteristics can be obtained without causing ionization even in a high current region.

[Brief explanation of drawings]

Fig. 1 shows an embodiment of the present invention, Fig. 2 shows details of the arc extinguishing device, and Fig. 3 shows details of the arc extinguishing plate used in the arc extinguishing device of Fig. 2. FIG. 4 is a diagram showing details of the control device in the embodiment of the pond, and FIG. 5 is a diagram showing a conventional switch. 1 is a container, 2 is a fixed contact, 3 is a movable contact, 30 is an arc runner, and 32 is a coil. Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (3)

[Claims] (1) A container provided in an outer chamber filled with arc-extinguishing gas and having an orifice; a fixed contact provided in the container; inserted through the orifice of the container during the charging operation to make the container airtight; A movable contact that communicates the container with an outside chamber during a shredding operation, an arc runner provided near at least one of the fixed contact and the movable contact, and magnetic field generating means that generates a magnetic field near the arc runner using a main circuit current. A switch characterized by: (2) The switch according to claim 1, wherein the magnetic field generating means is a coil, one end of which is electrically connected to an arc runner, and the other end electrically connected to a fixed contact. (3) The switch according to claim 1 or 2, characterized in that an arc control device is provided in the container.