JPS58133708A - 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 The present invention relates to a power switchgear and relates to an improvement of an arc runner by 1%. The conventional power switchgear is shown in Figure 1.
It is constructed as shown in FIGS. 2 and 3.

In the figure, (!) indicates an arc extinguishing arc box made of heat-resistant material, and the magnetic grid (2) and commutation plate (3) correspond to the number of phases of the electrical circuit to be opened and closed. The arrangement is fixed. (4) is the crossbar 1 (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 presser spring support. , (9) is a contact spring.

Or a stopper. The contact spring (9) is compressed and fixed between the lower end of the lower upper presser spring support (8) of the stopper aO, and the upper end of the presser spring support (8) and the movable contact presser (7). The upper surface and the upper surface of the movable contact (5) and the lower surface of the movable contact holder (7) are assembled in contact with each other. The movable contact is connected to a built-in well-known electromagnetic drive device via a contact wire (9).

Such contact machines #f are arranged symmetrically with respect to the A-m cross section, and are arranged in a direction perpendicular to the plane of the paper corresponding to the number of phases of the electrical circuits to be opened and closed.

FIG. 2 is a perspective view schematically showing the main parts of FIG. 1, such as the commutation plate (3), the movable contact (5), and the 1lil moving contact (6), and the fixed contact in FIG. 113. A schematic enlargement of the fixed contact 041 and the arc runner (is) is as shown in FIG. 3, 111(b).

In such a power switchgear, fixed contact Q4 and oT k
When the t+ contact (6) is opened, one end of the arc generated between the two inner contacts is transferred from the movable contact (6) to the commutation plate (3), while the other end is transferred from the fixed contact α to the arc a
Transfer to j. The other end 1 of the transferred arc moves toward the end on the t-arc launch US, and finally the arc is extinguished between the vertical part of the arc runner a9 and the commutator plate (3) opposite thereto. be done.

By the way, in the above arc runner aj, as shown in FIG. 3, when one end of the arc is transferred from the fixed contact (14) to the P point of the arc runner IO, the P point is now exactly the midpoint in the width direction of the arc runner 9. Therefore, the current i1.
i2 become equal to each other. This 'current tl l'
2 and the force F generated by the magnetic field is generated in the direction of the fixed contact on the drawing, so the arc does not run toward the end of the arc runner and stays at point P, which has the disadvantage of causing the arc to stick and making it impossible to interrupt the current. .

SUMMARY OF THE INVENTION An object of the present invention is to provide a power switchgear which prevents the inability to shut off due to the sticking of the arc transferred from the fixed contact to the arc runner by providing the arc runner with a notch groove of a predetermined shape in the longitudinal direction of the arc lunch. It is said that

FIG. 4(-1(b)) is a schematic block diagram showing an embodiment of the present invention.

In the figure, Ql~a"aFi has the same configuration as Figures 1 and 3. αQ is the V installed in the longitudinal direction of the arc runner)
This is a notched groove in Uto.

In the power switchgear equipped with the arc runner QS configured in this way, the fixed contact I and the movable contact (6) open and separate, and one end of the arc generated between both contacts moves from the fixed contact to point P of the arc runner a$. metastasize.

Here, a Fiv-shaped notch va is made in the arc runner (c).
Since n is formed, one end of the arc does not transfer to the intermediate point in the middle direction of the arc runner αω as in the conventional case, but necessarily transfers to a point other than the intermediate point. This transition point P is as shown in FIG.

Now, when the arc transfers to this point P, comparing the current path length from both ends A and B of the arc runner u9 to point P, we find that the current path length from the B end is 11.
# Because the path length is longer.

The force induced by the current passing through the current path of the wire and the magnetic field generated by this current does not point in the direction of the fixed contact as in the conventional case, but in the opposite direction, that is, towards the end of arc runner O5. This force has the effect of causing the arc to run in the 71 partial direction (indicated by arrow R in FIG. 4) on the arc runner α1. As a result, one end of the arc remains on the arc runner (151), and no agglomeration phenomenon occurs.

Regarding the material of arc runner Q9 mentioned below, F and F.
Although it is not particularly limited, if a magnetic metal is used as the material for arc runner 05, the magnetic force generated by the arc (C) will be as shown by the arrow in Figure 5, and since the magnetic flux becomes sparse on the right side of the arc, the arc will move to the right side. Since it is driven, excellent breaking performance can be obtained.

Above, we have described an example in which the present invention is applied to a power switching device that uses magnets to open and close contacts, that is, a power switch, but the present invention can also be applied to other power switching devices such as wiring and disconnectors. It goes without saying.

[Brief explanation of the drawing]

Figure 1 is a configuration diagram showing a partial cross section of a conventional power switchgear;
Figures 2 and 3 (,) are perspective views schematically showing a part of Figure 1, Figure 3 (b) is a sectional view of Mu A in Figure 3 (1), and Figure 4 (a). 4 is a block diagram showing an embodiment of the present invention, FIG. 4 is a sectional view taken along line AA in FIG. 4(a), and FIG. 5 is a diagram showing the magnetic force of the arc. In the figure, 0:1 is a fixed contact, ■ is a fixed contact, US is an arc runner, and ae is a notched groove. In the drawings, the same reference numerals indicate the same parts or parts corresponding to IIi. Fig. 1 Fig. 2 Fig. 3 1/3 '4'F Revision Agency Director-General 1IIGr'l, Display Patent Application 1987-1574
No. 7 2, Name of I and Akira Power switchgear; 3. Relationship between the person making the amendment and the important matter Part 1 To the representative of the patent applicant, Yuhito Kata, Part 1 Claims of the agent's specification The amendment to the Sat Annex of the claims shall be corrected. (2) Insert the following sentence next to "Assembled." on the -$14 line on page 2 of the specification. r03 is a terminal fixed to the top of Pace l with a screw. [1: 1tf, a U-shaped fixed contact screw tightened to the top surface of the terminal screw, and the fixed contact I is attached to the top surface. It is an arc runner with a fixed contact uK attached to the mouth. ” (3) Same, page 3, line 17, corrected to “near the midpoint Jt-r”. (4) Same, page 3, line 20, ``This electric ['ll'
2 and that Vcxb magnetic field h J k r coe) 11E6
Corrected to: ix-12tlcL due to the magnetic field. (5) Same, 4th tribute, line 17, rya is often J't
I am corrected by saying, ``R-separated.'' (6) Same, O6Jj, “Wiring and #IT equipment” in the off line
Correct it to ``Distributor tIjT device''. (7) Figure 1 of the drawings - Correct as shown in the attached sheet. 7. Catalog of attached documents Scope of the amended special IFF claims [1 set of written documents (2) drawings (Fig. 1) 1 or more claims] Arc tm@grid, MjJ constant weld fusion . A fixed contact joined to this fixed contact, a movable contact facing this fixed contact, an arc running between the grid and the surface electrically connected to the fixed contact and to which the fixed contact of the fixed contact is joined. Power switchgear fKi? 7. A power switchgear in which a notch is provided in the arc running part of the arc runner. (2) The power switching device according to item i11 of the claim, characterized in that the arc runner's power consumption is #1flt.

Claims (1)

[Claims] (Phantom) A grid for extinguishing arcs, a U-shaped fixed contact, a fixed contact joined to this fixed contact, a movable contact opposite to this fixed contact, a front and second identification contact In a power switchgear equipped with an arc launch having an arc running part between the grid and the surface to which the fixed contact of the fixed contactor is electrically connected, a cutout groove is provided in the arc running part of the arc runner. (2) A power switchgear according to claim 11, characterized in that the arc runner is made of a magnetic material.