JPS5990328A - Power switching device - 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 relates to a power switchgear.

(1) FIG. 1 is a partial sectional view showing a conventional power switchgear.

In the figure, (11 indicates the entire arc extinguishing box made of heat-resistant material, and the arc extinguishing plate (11) made of magnetic metal.
2) and the commutation plate (3) are arranged and fixed in accordance with the number of phases of the electric circuit to be opened and closed. (4; is the crossbar 9 (5) is the movable contact, (6) is the movable contact attached to both ends of the movable contact (5), (7) is the movable contact holder, and (8) is the holder. Support, +9m contact spring, tll is stopper.

The contact spring (9) is compressed and fixed between the lower part of the stopper 011 and the lower end of the pressing spring support (8).

The upper end of the presser spring support (8), the upper surface of the movable contact holder (7), the upper surface of the movable contact (5) and the movable contact holder (
7) is assembled in contact with the lower surface.

(11) is a base made of electrical insulator, (13 is a terminal fixed to the top of base I with a screw, 0 is terminal CI'1
A U-shaped fixed contact screwed onto the top surface of 5.
A fixed contact Q4 is attached to its upper surface.

The movable contact (5) is connected to a well-known electromagnetic drive device built into the movable contact spring (9).

Such contact mechanisms are provided symmetrically around the entire center of the A-A cross section, and are arranged corresponding to the number of phases of the electrical circuits that open and close in the direction perpendicular to the plane of the paper.

FIG. 2 is a perspective view schematically showing the commutation plate (3), the movable contact (5), and the movable contact (6) of FIG. 1.

Next, the operation will be explained. In such an electromagnetic switchgear, when the fixed contact α and the movable contact (6) are opened, one end of the arc generated between the fixed contacts flows from the movable contact (6) to the movable contact (5) and the arc horn ( 6) to the commutation plate (3), while the other end is transferred from the fixed contact 04 to the fixed contact 0. The other end of the transferred arc moves toward the end on the fixed contact (+31), and is finally extinguished by the metal arc extinguishing plate (2) between the fixed contact 03 and the commutation plate (3). be done.

The conventional electromagnetic switchgear operates as described above, but as shown in Figure 1, the movable contactor (51) and commutator plate (3)
There is a space between (IG exists, so the arc box (11
In addition, since an arc (3) is generated between the fixed contact facing part (2A) of the outermost arc extinguishing plate and the fixed contact a groove, an arc ( L!
After 9 is extinguished, a restriking phenomenon is likely to occur along the path indicated by the broken line in FIG. 1, and the breaking performance is poor.

Moreover, this arc (1!9 is caused by the heat of the arc box (11's arc (1!19 adjacent part (IA) '(r
When it heats up and is opened and closed frequently, there is a risk that that part (1A) may emit smoke or become perforated, causing a ground fault.

This invention was made in order to eliminate the drawbacks of the conventional ones as described above, and includes providing a second hollow portion into which a movable contact can fit into the surface of the commutation plate facing the metal arc-extinguishing plate, and the metal arc-extinguishing plate. By providing a magnetic arc runner having a surface facing the plate and electrically connected to a fixed contact, the purpose is to downsize the arc box and completely improve the breaking performance.

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

FIG. 3 is a perspective view showing the shape of a commutation plate according to an embodiment of the present invention, in which a cutout portion (6b), which is a second hollow portion, is formed on the surface (3a) facing the metal arc-extinguishing plate (2). is established.

The movable contactor (5) and the movable contacts (6) and (4) are configured to fit into this notch (3b). In Figure 3, the legs of the arc generated at the movable contact (6) are the movable contact (5).
It is driven by the magnetic field created by a fixed contactor (1).

The metal arc-extinguishing plate (2) is transferred to the leg (3C) of the commutation plate (3).
) is driven by the opposing surface (5a) or the movable contact (6
), the movable contact (5) is driven to the facing surface (3a) of the metal arc-extinguishing plate (2) without passing through the legs (3C).

Thereafter, the arc is extinguished by the metal arc extinguishing plate (2). The arc is extinguished in this way. In the electromagnetic switchgear according to an embodiment of the present invention, a notch (3b) is provided in a part of the opposing surface (6a) of the metal arc-extinguishing plate (2) of the commutation plate (3). Due to the presence of the notch (3b), the movable contact (5) and the movable contact (6)
) and the all-metal arc-extinguishing plate (2), the space 01=i in Figure 1 can be removed or reduced like in a conventional electromagnetic switchgear, so the arc box (1) It can be made smaller.

However, the magnetic commutator plate (3) is placed in front of the movable contact (5).
), the legs of the arc generated in the movable contact (5) become difficult to transfer to the commutation plate (3), resulting in a decrease in breaking performance and increased wear and tear on the movable contact (6).

Therefore, according to the present invention, as shown in FIG. 4, an arc runner plate made of a magnetic material is provided, which has a surface facing the metal arc extinguishing plate (2) and is electrically connected to the fixed contact Q3.

Therefore, the positive column of the arc is attracted towards the arc runner 0η, and the foot of the arc on the fixed contact H is moved towards the arc runner αη.
metastasizes to. Then, the arc is driven toward the metal arc-extinguishing plate (2) by the magnetic field created by the current flowing through the arc runner 07, and the leg of the arc on the movable contact (6) is quickly transferred to the commutation plate (3). Furthermore, the portion of the outermost arc-extinguishing plate facing the fixed contact (two people) and the fixed contact (
Since the arc +1'9 between the arc box (1) and the arc box (1) is removed, damage to the arc ([9) near the arc box (1 person) can be prevented, and the failure iK?Ef5 in Fig. 1 can be re-ignited. Since this will no longer occur, the blocking performance will be improved.

In addition, although the case of the electromagnetic switchgear was demonstrated in the said Example, the case of the circuit breaker for wiring may be sufficient.

The same effects as in the above embodiment are achieved.

As described above, according to the present invention, the second hollow portion into which the movable contact can fit is provided on the surface of the commutation plate facing the metal arc-extinguishing plate, and the second hollow portion is provided with the surface facing the metal arc-extinguishing plate and the fixed contact Since the magnetic arc runner gold, which is electrically connected to the arc runner, is biased, the arc runner can be made smaller, and the breaking performance can be improved.

[Brief explanation of drawings]

FIG. 1 is a partial sectional view showing a conventional electromagnetic switchgear. FIG. 2 is a schematically enlarged perspective view of the commutation plate shown in FIG. FIG. 2 is a side view showing an arc runner of an electromagnetic switchgear according to an embodiment of the present invention. In the figure, (2) is a metal arc-extinguishing plate, and (3) is a commutation plate. (3a) is the surface of the commutation plate (3) facing the metal arc-extinguishing plate, (3
1-1) is the notch part which is the second hollow part, (5) is the movable contact, (6) is the movable contact, 0 is the fixed contact, 04
(The fixed contact and θ'0 are the arc runners. The same symbols in Figure 0 indicate the same or equivalent parts (7). Agent Shin Kuzuno - (8) Figure 1 Figure 3, stomach

Claims (1)

[Claims] A fixed contact joined to a fixed contact, a movable contact joined to a movable contact and provided opposite to the fixed contact, and a metal arc-extinguishing plate provided in a direction perpendicular to the surface of the fixed contact. , a first hollow portion having a surface facing the metal arc-extinguishing plate and a surface facing the surface of the fixed contact, into which at least a portion of the movable contact can fit; In the power switchgear, the commutation plate is provided with a second hollow portion into which the movable contact can fit into a concave surface of the commutation plate opposite to the metal arc-extinguishing plate, and a surface facing the metal arc-extinguishing plate is provided. A power switchgear comprising: a magnetic arc runner which is electrically connected to the fixed contact;