JPS6074320A - 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 invention applies to arcs such as vacuum breakers, etc. The present invention relates to a circuit breaker that is driven in the circumferential direction of an electrode to break the circuit, and particularly relates to the configuration of a magnetic material that is added to the electrode to increase the driving force of the arc.

[Prior art]

Figure 1 is a front view of the tF pole of a conventional vacuum breaker of this type.
FIG. 2 is a sectional view taken along line II--II in FIG. 1. In the figure, (1) is one of a pair of disc-shaped electrodes arranged coaxially and in contact with each other, and is symmetrically arranged around the central axis, facing inward from the outer periphery. It is composed of four spiral grooves (2a) to 2d) and four spiral grooves (8a to 8d). , are the contact surfaces formed on opposite sides of the electrode (1).The groove of the other electrode (not shown) is the contact surface formed on the opposite side of the electrode (1).
) are provided so as to be symmetrical with respect to the surface facing the grooves (2a) to 2d). FIG. 8 is a front view showing the outer shape of yet another shape of the electrode of this kind of conventional vacuum breaker;
The figure is a side view thereof, and FIG. 6 is a cross-sectional view taken along the line ■-V in FIG. 8. In the figure, 4 (4) is the open side tip contact surface (4a)
A cup-shaped electrode with a predetermined inclination in the axial direction from the contact surface (4a). 't'Lfc8 grooves (5a
) to 6b) and eight rjIi pole pedals (6a) to 6h).

Do electrodes (1) in Figure 1 and electrodes (4) in Figure 8 both arc in the circumferential direction of the electrodes? It is a type of drive-on and cut-off method, and the electrodes (]) in Figure 1 are shown below. For example, that vJ
Explain the work. In FIG. 1, when the electrode (1) is separated, a point PV arc is first generated on the contact surface (1a). At this time, since the current path formed by both electric poles and the arc has a slight radial component, the magnetic field based on the current gives an electromagnetic chip to the arc so as to move the arc further in the radial direction. And Denga Veda tV (8a
) is formed in a spiral shape as shown in the figure, and in the end the arc is like the current path (Q) and the military pedal (Ba).
Localized heat input to the electrode (1) driven in the k-circumferential direction and based on the arc? By avoiding this, the breaking performance can be improved.

However, in the conventional circuit breaker as described above, as the breaking current increases, the arc moves along the current path CQ, ) in FIG. However, in general, the above electromagnetic force causes an arc? V to rIAi from the tip (R),
It was difficult to move the pole peg A/ (8b) to the opposing part (B), and the arc stagnated at the tip (R), resulting in failure, which was one of the causes of failure.

[Summary of the invention]

This invention was made in order to overcome the drawbacks of the conventional ones.
By arranging the roughly U-shaped magnetic body part on the opposite side of both electrodes, the magnetic driving force acting on the arc is strengthened and the arc is transferred from the tip of the electrode pedal to the adjacent electrode pedal, causing an arc. The purpose of this invention is to provide a breaker that can avoid failure to shut off due to stagnation of pillars.

[Embodiments of the invention]

Hereinafter, embodiment drawings of this invention will be described.

FIG. 6 is a front view of an electrode of a vacuum breaker in an embodiment to which the present invention is applied, and FIG. 7 is a sectional view taken along the line ■--■ in FIG. 6. In the figure, an electrode (1), a contact surface (1a),
Spiral groove (2a) or 2d), electrode bed/
1/ (8a) to 3d) are the same as in the conventional case, so their explanation will be omitted. (7a) or 7d) is the 8th
As its detailed outline is shown in the figure, it is a U-shaped magnetic body, and its open side 7 is placed on the opposite side of both electrodes so as not to be directly exposed to the breaking arc. electrode pedal) v (8a
) to 8d) are arranged so as to surround the circumferential tip portions thereof. (8) is the arc column and (8a) is the direction of the current. In the vacuum breaker in one embodiment of the present invention configured as described above, the current path (Q
) The arc column (8) that has accumulated and moved is the electrode pedal A/
When the tip (R) of (8a) is reached, the electrode bed yv
The magnetic I-rape (B) formed by the current flowing through (8a) is strengthened at the tip (R) by the magnetic body (7a). Due to the interaction between this strengthened magnetic force and the current in the arc column (8), the force (F) applied to the arc column (8) is stronger when the magnetic material (7a) is As a result, the arc column (8) easily moves from the tip (R) of the electrode pedal (8a) to the opposing part (S) of the contacting electrode pedal (8b). Furthermore, when a part of the arc column [8] moves to the opposing part (S), a current path (η) is formed as shown in FIG. 6, but current paths (Q) and (T)? When compared, the presence of the magnetic material (7a) makes the current path (
Since the circuit inductance of Q) is larger than the circuit inductance of the current path (T), the transition from the tip (f() of the arc column (8) to the opposing part (S) is smooth n
It also has the effect of In this way, the arc column (8) does not stay at a specific tatami pole beda JvV and moves to the adjacent electrode pedal, so is it impossible to shut off due to stagnation of the arc column (8) like in the past? can be avoided.

Is this invention shown in Figure 9? This is a front view of an electrode of a vacuum breaker in another applied example, and is a front view of an electrode of a vacuum breaker according to another embodiment of the present invention. It is something. FIG. 10 is a cross-sectional view taken along line xx in FIG. 9, and FIG. 11 is an enlarged view of the magnetic body (9). In this case, in Fig. 10, the arc column n<i shifts from the magnetic beam A/(6a) to (6b) due to the magnetic driving force (F) strengthened by the magnetic body (9f).Same as in the previous example. Demonstrates the effect of 'In each of the above embodiments, the magnetic body is formed in a U-shape, but it can also be formed into a substantially U-shape, including a U-shape, etc., if the opposing side forces of both electrodes are released. A lot of them.

Also, is the magnetic material the outer periphery of the tip of the electrode plate μ? It is surrounded by magnetic material, but is it part or all of the magnetic material? The structure may be such that it is embedded in the electrode, and furthermore, the magnetic material may not necessarily have an integral structure but may have a divided structure. Further, the breaker is not limited to a vacuum breaker, but can be applied to various types of circuit breakers and switches.

〔Effect of the invention〕

As explained above, this invention consists of a substantially U-shaped magnetic body that surrounds each electrode bed. By placing the open side on the opposite side of both electrodes, the magnetic driving force acting on the arc is strengthened, the arc is transferred from the tip of the electrode pedal to the adjacent electrode pedal, and the interruption function due to stagnation of the arc column is prevented. The effect is that it can be avoided.

[Brief explanation of drawings]

Figure 1 is a front view of the electrode of a conventional vacuum breaker, Figure 2 is a sectional view taken along the line ■-■ in Figure 1, and Figures 8 and 4 are of still another shape of the conventional vacuum breaker. N front view and side view of the electrode, item 511\I is a sectional view taken along the ■-V line in Figure 8,
FIG. 6 is a front view of an electrode of a vacuum breaker according to an embodiment of the present invention, FIG. 7 is a sectional view taken along the line ■-■ in FIG. 6, and FIG.
The figure is a detailed perspective view of the magnetic material in FIG. 6, FIG. 9 is a front view of a vacuum breaker unit according to another embodiment of the present invention, and FIG. 10 is a cross-sectional view taken along line X-X in FIG. 9. , FIG. 11 is a detailed perspective view of the magnetic body of FIG. 9. In the figure, (1)
(2a) to 2d) and (5a) to 5h) are grooves, (8a) to 8d) and (6a) to 6h) are electrodes, (7a) to 7d) and ( 9a) to 9h) are made of magnetic material. In addition, are the same symbols in the figures the same or equivalent parts? show. Agent Masuo Oiwa Figure 1 Figure 2 Figure 3 An Figure 5 Figure 6 Figure 7

Claims (6)

[Claims] (1) Inside each of the above-mentioned electrodes, each of the pair of electrodes is arranged coaxially and removably. Multiple electrode pedals with multiple grooves symmetrically extending from the edge to the inside on opposing surfaces so that the path of the flowing current has a circumferential component? The arc above by forming? In the device that is driven in the circumferential direction, each of the electrodes has a substantially U-shaped magnetic sound surrounding the /L/f section 9, and its open side? Did you install it on the opposite side of the two electric wires mentioned above? Features a breaker. (2) Are the electrodes formed in a disc shape? A circuit breaker according to claim 1, characterized in that: (3) The breaker according to claim 2, wherein the groove is provided in a spiral shape. (4) The circuit breaker according to claim 1, characterized in that the electrodes are formed in a cup shape and are disposed with their open sides facing each other. (5) Was the groove provided with a predetermined inclination in the axial direction from the opposing angle of the electrodes? A circuit breaker according to claim 4, characterized in that: (6) The magnetic material is arranged at the circumferential tip of each electrode pedal.
Was it? A circuit breaker according to claim 8 or 5, characterized in that: