JPS5854530A - Circuit 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 The present invention relates to a circuit breaker with an improved fixed contact and improved breaking performance.

Conventional - Consisting of a conductor and a contact fixed to the conductor, it has at least one pair of fixed contact and movable contact that are paired with each other, and when the upper epsilon and both contacts are closed.

The conductor is arranged in a straight line, and the current flowing through the conductor is almost linear and oriented in the same direction. The cutting performance was poor.
1(1), -) will be explained in detail based on FIG.

FIG. 1(&), 弽) shows a conventional circuit breaker. In this figure, (to) is an enclosing drop forming the outer frame of the circuit breaker, and is surrounded by an insulating material. The following is a fixed contact, and the above enclosure (to) [non-fixed fixed conductor (formerly 1
) is formed by fixing the tip C fixed contact (212). -9
consists of a movable contact (312) that comes into contact with and separates from the fixed contact (212) of the movable fixed contact (b) that forms a pair with the fixed contact (2). The ring is an arc-extinguishing plate, and the movable contact (31
2) is used to cool the gap (60) generated when the fixed contact (212) is opened.

Now that the movable contact (312) and the fixed contact (212) are closed, the current flows from the fixed conductor (211) to the fixed contact (
212)→movable contact (312)→movable conductor (311). At this time, as already mentioned, when closing between the fixed contactor and the movable contactor (b),
The fixed conductor (210) and the movable conductor (311) are arranged in a straight line with each other, and the current flowing through the conductors (211) and (311) is almost straight and points in the same direction.In this state 11f, , when a large current such as a short circuit current flows through this circuit, the operating mechanism N- is driven and the movable contact (312)
is separated from the liI constant contact 12). With this operation, an arc (60) is generated between the 4f fixed space contact (212) and the movable contact (312). This arc (60) is caused by the magnetic force of the current flowing through the movable conductor (311) and the arc extinguishing plate @tn
The arc-extinguishing plate moves simultaneously due to the suction force and comes into contact with the arc-extinguishing plate. When the arc (60) comes into contact with the arc extinguishing plate, it receives a rough magnetic attraction, and is elongated and cooled, thereby extinguishing the arc.

Second [1! I is the fixed contact (212) and the movable contact (3).
12) It is an explanatory diagram of the magnetic force without the current flowing between the two.

In this figure, current 4 flows through the fixed conductor (211) K from right to left in the figure, and similarly, current 2 flows through the movable conductor (311). Flowing 0g and solid space contact (212)k
An electromagnetic counterforce is acting on the arc (60) generated around the movable contact (312) due to the movable conductor (1'b&).

The direction of this force is shown by the arrow in the middle of the m-movable conductor (3
11) In a different direction, the noodle is a movable contact (
js12) near (large, large, fixed conductor (211)
An electromagnetic repulsion force of 1 field is acting, and its direction and strength show the same characteristics as described above. Therefore, the 7-tater (60) is movable at the movable contact (312) If. Insert the fixed contact (212) toward the tip of the conductor ($11).
) At @, the movable conductor (3H) II receives a driving force respectively - the arc (60) that receives the force in the opposite direction not only does not extend its positive column sgt11, but also the arc extinguishing plate shown in Fig. 1 Move one step in the - direction ((towards the arc extinguishing plate)
It doesn't receive enough of the cold J1 effect, so I can't say that the shutoff performance is good.

In other words, in order to extend or drive Qi # (4G) in one direction of the arc-extinguishing plate and achieve the same breaking performance, the fixed conductor (2
11) Kara? -1 (60) IICb name] Fa1
7) The force can be reduced (it is only necessary to reduce the force).This invention can reduce the force by providing grooves in the fixed conductor, which are located on both sides of the fixed contact and run through the front and back of the fixed conductor in the direction along the current flow. The object of the present invention is to provide a circuit breaker that can reduce the force exerted on the conductor and improve the breaking performance.

Embodiments of the present invention will be described below with reference to the drawings while comparing them with conventional examples.

Figures S (a) and (b) show conventional fixed contact ψ excitation. In this diagram vc, among the currents flowing through the fixed conductor (211), the one flowing through the center is marked ◎, and the one flowing at the side ends is called l-. The sum of these currents applies an electromagnetic force to the wire (60) generated between the fixed contact (212) and the movable contact (312), thereby suppressing the arc (60) toward the movable contact shaft.

The fixed conductor ('221) le is the fixed contact ('221)
Grooves (7o) are provided on both sides of the conductor (222), penetrating the front and back sides of the conductor (221), and running in the direction along the flow of current D. In this view, the current 2 flowing through the solid vM conductor (221) is separated from the groove (70) as a block like IL work 0, and the current flowing outside the groove (70) is divided into grooves (70).
), (70) in the opposite direction (when flowing into the fixed contact (222), the fixed conductor (221)
The electromagnetic force caused by this is greatly reduced. As a result, the movable conductor (
111) As the electromagnetic force becomes relatively large, the arc (6o) is rapidly driven and extended by the arc-extinguishing plate in Figure 1 f. The strength of the magnetic field generated at t in the fixed contactor (2) and the fixed contactor of this invention is determined by Biot Perl's law ji
Check it out and compare.

If the magnetic field of the conventional tm** contactor 1c is HX, then from FIG. 3 the magnetic field of the fixed contactor of the present invention is Hl and b, and from FIG. As can be seen from the formula, the fixed conductor of this invention (22tl-
(6G) IC acting force IFa4 small g<1kh, y-Y (60) is quickly driven and extended toward the arc-extinguishing plate side, and is sufficiently affected by the cooling effect of the arc-extinguishing plate. The specific situation of the arc (60) is shown in 5th vIJc. According to this, due to the decrease in the magnetic field from the fixed contact (2), 7-? The acting force C1& at (60) becomes small 5<, and as a result, the arc (60) is quickly driven and extended toward the arc-extinguishing plate side. Therefore, the breaking performance is good.

FIG. 6 shows another embodiment of the present invention.

No. 41i11 (C% like Xun) The length of the groove (70) is longer than the fixed contact (222), and the groove (7G) tn both ends II
It is preferable that (80 m) and (130b) extend from both ends of the fixed contact (222) - (90 m) and (90b), but as shown in Fig. 6 (&), the fixed contact (222)
1rl one end side (90m) is one end (80a) of groove (70)
), the relationship in equation (2) above holds true, and the effect is sufficient.

As can be understood from the above description, according to the present invention, grooves are provided in the conductor of a fixed contact, located on both sides of the contact point of the conductor, and extending through the front and back of the conductor in the direction along the current flow. By providing a circuit breaker, it is possible to reduce the force exerted by the tiiffl conductor and to provide a circuit breaker that can achieve the same breaking performance.

[Brief explanation of the drawing]

Figure 1 (Xun is a partially cutaway plan view of a conventional circuit breaker, Figure 1) is a sectional view taken along the lb-1b line in Figure 1 (&) - Figure 2
The figure is an explanatory diagram of the force acting on a conventional arc. IIIg'S - A plan view of the solid contact of the circuit breaker according to the embodiment, FIG. A fixed contact of a circuit breaker according to an embodiment of the invention acts on an arc (force theory 111 JFA, FIG. 6 (&) is a plane view showing another embodiment of a fixed contact of a circuit breaker according to this invention. Fig. 6vli(b) is 6 of Fig. 6(&)
b It is a sectional view taken along line B-611. ), @... Fixed contact % (241), (fil)
... Fixed conductor (212), (222) ... Fixed contact, ◇ ... Movable contact, (511) ... Possible aS body, (! $ 1) - ... Movable contact, (7G )--groove, (8
0m) (80b) - Both ends, (90m), (9
013) - Both ends [[N. In addition, in the figures, the same reference numerals indicate the same or corresponding parts. Agent Ge Shuxin (1 other person) Figure 1 (a) Figure 1 (b)

Claims (2)

[Claims] (1) Consisting of a conductor and a contact fixed to the conductor, it has at least one pair of fixed contact and movable contact that are paired with each other, and when the two contacts are closed, the conductor is in a straight line. In a circuit breaker It, in which the current flowing through the conductor is almost linear and points in the same direction, the conductor f% of the contactor is A circuit breaker characterized by having a groove extending in the direction of current flow through the front and back sides of a conductor. (2) The circuit breaker according to claim 1, wherein the length of the TH groove provided in the conductor of the fixed contact is longer than that of the contact, and both ends of the groove extend from both end sides of the contact.