JPS6049529A - 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] [Technical field of invention] This invention relates to a circuit breaker.

[Prior Art] Figures 1 to 3 are cross-sectional views showing conventional circuit breakers.
It has different operating states.

(1) is a cover, (2) is a base, and the cover (1) and the base (2) constitute a container (3). (4) is a fixed contact, and a fixed contact (6) is attached to one end of the fixed conductor (5).
) is 41, and the other end is a terminal portion to be connected to an external conductor (not shown). (No. 7 is II) is a moving contact, which has an fjJ moving contact (9) at one end of its IJJ moving conductor (8) opposite to a fixed contact (6). (1o) is B
The f-moving contact device (11) is an rrf moving arm, which is fixed to the cross spar (+2) and is configured to be opened and closed when each pole is spaced. (13) is an arc extinguishing chamber, and an arc extinguishing plate (14) is held by a side plate (15). (16) is a toggle link mechanism, which is composed of an upper link (17) and a lower link (18). One end of the upper link (17) is attached to the cretor (
18) and the other end is connected to one end of the drink (18) by shafts (20) and (21), respectively. The other end of the lower link (18) is connected to the movable contact device (10).
) is connected to the movable arm (11). (22) is a tilting operation handle, and (23) is an operating spring, which connects the shaft (21) of the toggle lick mechanism (16) to the operation handle (2).
2). (24), C25)
are thermal and electromagnetic trip mechanisms, respectively, and when activated, bimetal (26) and movable iron core (2
7) rotates the trip 8-(28) counterclockwise. (28) is a latch whose one end is engaged with the trip 8-(28) and the other end is engaged with the flettle (19).

If the operating handle (22) is tilted to the closing position with the fredle (19) locked to the latch (28), the toggle link mechanism (16) will extend and the shaft (21) will be locked to the fredle (19) and movable. The contact (8) is joined to the fixed contact (6).

This state is shown in FIG.

Then, when the operation handle (22) is tilted to the open position, the toggle lick mechanism (16) is bent to separate the Df moving contact (9) from the fixed contact (6), and the movable arm (11) moves toward the fredl shaft (30). ). This state is shown in Figure 2.

Furthermore, if an overcurrent flows through the circuit in the closed state shown in FIG.
29) is released, the frettle (18) rotates clockwise around the frettle (30), and the stopper shaft (3
1). Fretle (19) and -1-Link (
17) exceeds the line of action of the operating spring (23), the toggle link mechanism (16) is bent by the spring force of the operating spring (23), and each pole is interlocked by the crossbar (12) to automatically Make a cutoff. This state is shown in FIG.

Next, the behavior of the arc generated when the circuit breaker cuts off the electromagnetic circuit will be explained.

Now, when the movable contact (8) and the fixed contact (6) are in contact, the power is transferred from the power supply side to the fixed conductor (5).
), fixed contact (6), movable contact (9) and movable conductor (
8) and is sequentially supplied to the load side. If a large current such as a short-circuit current flows through this circuit in this state, the movable contact (8) is separated from the fixed contact (6) as described above. At this time, the fixed and movable contacts (8),
An arc (32) is generated between the fixed and movable contacts (6) and (9), and an arc voltage is generated between the fixed and movable contacts (6) and (9).

This arc voltage is generated from the fixed contact (6) to the oJ moving contact (
8) rises as the separation distance increases, and at the same time, the arc (32) is attracted and elongated by magnetic force toward the arc extinguishing plate (14), so that the arc (32) is further heated.

In this way, the arc current reaches a current zero point and the arc (32) is extinguished, completing the interruption. During such a breaking operation, a large amount of energy is generated between the movable contact (9) and the fixed contact (6) by the arc (32) in a short period of time, ie, within a few milliseconds. Therefore, the temperature of the gas in the container (3) rises and the pressure also rises rapidly, but this high-temperature, high-pressure gas
The outlet (33) formed in the side wall on the power supply side of
released into the atmosphere.

In the operation of the circuit breaker as described above, arc resistance R is generally given by the following formula. That is, Sentence R-ρ□ However, R: Arc resistance (Ω) ρ: Arc resistivity (Ωfist cm) Sentence: Arc length cm) S: Arc cross-sectional area (0m2) However, generally at large currents of several KA or more, In addition, in a short arc (32) where the arc length intersection is 50 mm or less, the arc space is occupied by metal particles. Moreover, this release of metal particles occurs in a direction perpendicular to the contact surface. Furthermore, the ejected metal particles have a temperature close to the terminal point of the metal at the contact point at the time of ejection, and as soon as they are injected into the arc space, they are heated to high temperature and high pressure by being injected with electrical energy.

If the contacts (6)' and (9) are exposed to such conditions for a long time, the contacts (6) and (9) may melt. For this reason, Fig. 4 (A), (
As shown in "B)", an arc runner (34) is disposed on the rear side of the contact fixing position in the fixed conductor (5). This is the above contact point ([i), (
9) The main purpose is to protect the contacts (6) and (9) by quickly moving the leg of the arc (32) on the fixed contact (6) side that occurs between them to the arc runner (34) +5. It is said that

However, in the case of item 1, even if the arc (32) is dislocated to the arc runner (34), it is difficult to completely separate from the fixed contact (6), and the arc current at the time of this dislocation is
As shown by the arrow in Figure (B), the current flows from the base end of the fixed conductor (5) to the arc runner (34) bypassing the fixed contact (6) side, causing the fixed contact (6) to overheat due to the passage of the current. However, there was a drawback that the contact point (6) was easily worn out.

[Summary of the Invention] This invention was made in order to eliminate the drawbacks of the conventional ones, and the tip side of one of the conductors of a pair of electric contacts has a substantially U-shaped part and a contact fixing piece part. By fixing to the conductor of this contact an arc runner having a wing-like tip extending from a position near the contact toward the power supply side and having a spacing from the conductor surface, the contact can be made into a specific shape. It is an object of the present invention to provide a circuit breaker that can reliably prevent consumption of the circuit breaker and improve the breaking performance.

"Embodiment of the Invention" Figures 5 and 6 show the configuration of main parts in an example of a circuit breaker according to the present invention, and the same parts as in Figures 1 to 4 are designated by the same symbols. The explanation will be omitted.

In the same figure, (51) is a fixed contact element, and consists of four fixed bodies (52) and a fixed contact (6). ”-Fixed 4
The distal end side (520) of the body (52) is bent into a substantially U-shape, and the distal end of the assembly straight piece portion (520a) on the load side of the U-shaped distal end portion (520) is connected to the contact fixing piece portion (521). ) is extended toward the power supply side.

(53) is the connecting piece (
520b) with a rivet (54) or the like, and is made of, for example, a magnetic material. The tip (530) of this arc runner (53) is shaped like a wing and extends from a position near the fixed contact to the power source side,
It faces the surface of the base end (522) of the fixed conductor (52) at a distance G.

(55) is a pressure reflection pair made of a high resistance material having a higher resistivity than the four fixed bodies (52), and the fixed conductor (52) is arranged so as to cover the conductor part around the fixed contact (6).
) is fixed. The above-mentioned high-resistance materials include, for example, organic or inorganic insulators or high-resistance metals such as nickel, iron, copper-nickel, copper-manganese, iron-nickel, and iron-chromium, which can be coated by thermal spraying, fixed to molded products, etc. It is provided in the following manner. The movable conductor (8) side is also shown in Figure 7 (
Pressure reflection pairs (56) having the same configuration as shown in A) to (C) are provided.

Next, the operation of the above configuration will be explained.

The opening/closing operation by the fixed and movable contacts (51) i (7) is the same as the conventional one, and the explanation thereof will be omitted.

1. With the opening operation of the movable contactor (7), an arc (32) is generated between the contacts (6) and (9) as shown in Fig. 7 (A), and this arc (32) is an arc extinguishing plate (14
) begins to be attracted and stretched by the magnetic force.

Then, the wing-shaped tip (530) of the arc runner (53)
) is heated by the arc (32), so that the legs of the arc (32) are likely to move the wing-shaped tip (530). Then, when the legs of the arc (32) move to the tip (530) No. 41 as shown in FIG. 7(B), the arc (32) is expanded and the tip (530)
The driving force based on the arc current flowing in the arc further drives the arc toward the power supply side, and the arc becomes even longer as shown in FIG. 7(C). After this, the arc voltage increases at the current zero point, the arc (32) is extinguished, and the interruption is completed.

Here, since the arc (32) generated between the contacts (8) and (9) quickly moves to the tip (530) of the arc runner (53), wear and tear on the contacts (6) etc. is reduced.

In this case, since the arc runner (53) is made of magnetic material, the arc (32) can be effectively moved. Furthermore, when the arc (32) moves to the tip (530) of the arc runner (53), it is forcibly driven toward the power supply side by the driving force based on the arc current, so the elongated state of the arc (32) is large, and therefore the breaking property is Becomes excellent.

In addition to the shape of the tip (520) of the fixed conductor (52) being specified, the pressure reflector (55), (5B) covered between the contacts (8), (9) Since the current is narrowed down to the arc (32), the current limiting property at the beginning of opening is ensured.

By the way, if the height level H of the wing-shaped tip (530) of the arc runner is made larger than the height level h of the main surface of the fixed contact (θ), the heating effect by the arc (32) will be large and applicable. The legs of the arc (32) will be more likely to transfer to the wing-shaped tip (530) of the arc runner (53), but conversely, in this case, the current limiting property will be slightly reduced.
- It is preferable to set the height level H of the plate piece-like tip (530) to be approximately the same as the height level h of the fixed contact (6).

In addition, the shape and take-up position 1 of the above-mentioned arc runner (53)
6 is not limited to that of the above embodiment; for example, as shown in FIG. , fix the base end of the arc runner (53) here.
Af is fine. In this case, the leg of the arc (32) passes through the -1- marked inclined surface to the tip (530) of the arc runner (53).
) side becomes easier. Furthermore, if the base end of the arc runner (53) is fixed to the vertical piece (520a) on the load side of the tip (520) as shown in FIG. The tunnel becomes longer and the arc (3
The above-mentioned driving force for 2) can be strengthened.

Of course, the base end of the arc runner (53) is connected to the fixed conductor (
52) may be fixed to the proximal end (521) as shown in FIG.

[Effects of the Invention] As described above, according to the present invention, the tip side of the single-force conductor of the L air vent contactor of the l pair is made into a circular shape, and the tip of the arc runner is attached to the conductor. By fixing with a gap at the base end of the contact point, wear and tear on the contact point is suppressed.
Moreover, it is possible to provide a circuit breaker that can improve the breaking performance.

[Brief explanation of drawings]

Figures 1 to 3 are cross-sectional views of a conventional circuit breaker in different operating states, and Figures 4 (A) and (B) are perspective views of a fixed contact with an arc runner in the conventional circuit breaker, respectively. 5 and 6 are a perspective view and a +IE side view showing a fixed contact piece incorporated in an example of a circuit breaker according to the present invention, and FIGS. 7(A) to (C
) are operation explanatory diagrams of the main parts of the circuit breaker, Figures 8 to 1.
FIG. 0 is an explanatory diagram of a modified structure of the main part of the present invention. (3)...Container, (6), (9)...Contact, (
7), (51)...electric contact, (8), (52
)...conductor, (14n...arc-extinguishing plate, (32)...
Arc, (53)...Arc runner, (520)...
U-shaped tip, (520a)...Load side vertical piece part, (:521)...Contact fixing piece part. (522)...
・Proximal end. In addition, the same reference numerals in the figures refer to the same or corresponding parts. Agent: Masuo Oiwa Procedural amendment (voluntary) Mr. Commissioner of the Japan Patent Office 1. Indication of the case: Japanese Patent Application No. 58-156710 2. Name of the invention, circuit breaker 3. Relationship with the person making the amendment: Katayama, representative of the patent applicant. Representative 4, Agent 5, ``%-Claims'' column of the detailed description subject to amendment. f111 Correct Contents A, Description: (1) Amend the scope of claims in a separate document. Claims as amended above [(1) At least one pair of electrical contacts configured of a conductor and contacts fixed to the conductor and operated to open and close within a container; and an opening operation of the electrical contact. and a plurality of arc-extinguishing plates disposed within the container to extinguish arcs that sometimes occur between the contacts, and the tip of the conductor of one of the pair of electrical contacts. The tip of the vertical piece on the load side of the end has a substantially U-shape with the side open toward the main surface of the conductor, and the tip of the vertical piece on the load side is extended to the power supply side as a solid contact piece, so that the arc at the time of opening is transferred from the contact to the power supply. An arc runner having a wing-shaped tip that can be moved to the side is fixed to the power source side in the direction of the electrical circuit, and the contact position of the conductor of the one electric contact is also fixed to the power source side, and the tip of the arc runner and the tip of the one of the electric contacts are A circuit breaker in which a predetermined distance exists between the electrical contact and the base end surface of the conductor. (2) The circuit breaker according to claim 1, wherein the arc runner is made of a magnetic material.

Claims (3)

[Claims] (1) at least one pair of electrical contacts consisting of a conductor and a contact fixed thereto, which open and close within the container; ``A plurality of arc-extinguishing plates arranged in the container for the purpose of It is formed into a substantially U-shape with an opening on the main surface side, and 51. 1. An arc runner with a laminate-shaped tip that transfers the arc during opening from the contact to the power source side, with the end extending to the power source side as a contact fixing piece. The recording force is fixed on the power supply side in the direction of the electric circuit from the fixed position of the conductor of the electric contact, and the tip of the 1st leg of the arc runner and the 1st part of the conductor of one of the electric contacts are
A circuit breaker with a predetermined distance between the end and human blood. (2) The circuit breaker according to claim 1, wherein the arc runner is made of a magnetic material. (3) The circuit breaker according to claim 1, wherein the base end of the arc runner is fixed to a load-side vertical piece of a conductor having a substantially U-shaped tip.