KR20120040092A - Circuit breaker - Google Patents

Abstract

PURPOSE: A battery circuit breaker is provided to secure high breaking capacity without enlarging the size of an outer tube. CONSTITUTION: A case of a battery circuit breaker is composed of a cover and a base. An opening and closing tool part is installed between frame plates which are faced each other. A cross bar is connected to the opening and closing tool part. A movable contact(9) is connected to the cross bar. A moving contact point is formed in one end of the movable contact. A fixed contact(7) has a fixed contact point(8). The fixed contact point and the moving contact point are repeatedly contacted. An extinguishing device controls arc created between the movable contact point and the fixed contact point. The opening and closing tool part and the extinguishing device are accepted in the base.

Description

Circuit breaker {CIRCUIT BREAKER}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to circuit breakers such as circuit breakers and earth leakage breakers, and more particularly, to circuit breakers with improved breaking capacity without increasing the outline.

The circuit breaker has a function of opening and closing the converter by operating an operation handle provided in the circuit breaker, that is, not only a switch function, but also a circuit breaker in order to prevent loss of electric wires or load devices due to overcurrent flow. Plays a big role. In the detection of this overcurrent, it is known that the method is performed by each of the following methods: thermal, electronic, and electronic. It is also noted that for a larger overcurrent, i.e., a short circuit current, the mover is quickly turned by the electromagnetic repulsion force generated between the contacts without waiting for the operation by each of these methods.

An arc is generated between the contacts by the rotation of the mover. The arc is attracted to the arc chamber by the magnetic action, and the arc is extinguished by an increase in the arc resistance by the expansion and cooling of the arc. By this extinction, the blocking of the converter described above is achieved. However, for example, even if the short-circuit current larger than that accompanied by the increase in the power supply capacity is not changed by changing the moving distance of the mover, that is, by the same outline, the expansion and cooling of the arc described above alone will not prevent the short circuit current. There was a limit in itself.

Therefore, a coil relaying between the power supply terminal and the fixed contact is provided on both sides of the mover's opening and closing range, and a short circuit current flows through the coil to generate magnetic flux. . Then, it is known that the magnetic flux dissipates the arc by a so-called blow action that attracts the arc more strongly to the arc extinguishing chamber by traversing the arc (see Patent Document 1, for example).

Patent Document 1: Japanese Patent Application Laid-Open No. 2000-188031 (Page 3 Left Column 42-Right Column 20, Fig. 1 and Fig. 2)

By the way, in the installation of the coil disclosed in the patent document 1, since it depends only on the magnetic flux by the flow, the so-called current-limiting effect is generated in which expansion and cooling start and the short circuit current decreases. On the contrary, when the current-limiting effect began to take effect, the blow action was also weakened, causing the arc to return between the movable contactor (movable contact point) and the fixed contact point that reached the "open" position. Because of this,

The possibility of abnormal deterioration, insulation deterioration due to a decrease in current-limiting performance, etc. is considered, and it is difficult to secure a higher breaking capacity.

This invention is made | formed in order to solve the same subject as described above, and it aims at obtaining the circuit breaker which has a high breaking capacity by devising the shape of a coil, without making an outer periphery large.

The circuit breaker according to the present invention includes an opening / closing mechanism portion provided with an operation handle and interposed between the frame plates facing each other, a crossbar rotating in conjunction with the opening / closing mechanism portion, and a movable contact having a movable contact at least at one end thereof. And a fixed contact having a fixed contact repeating the movable contact and the folding contact, a extinguishing device for cutting an arc generated between the contact and the opening / closing mechanism and the extinguishing device. A base housed therein, and the fixed contactor and the power supply side terminal fixed to the base are electrically connected by a blow out coil, and further, to the blowout coil, attracts the arc to the arc extinguishing device. The first arc suction path and the second arc suction path are provided.

According to the present invention, it is possible to provide a circuit breaker having a high breaking capacity without increasing the outline.

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which shows the circuit breaker in the example of embodiment of this invention.
FIG. 2 is a partially enlarged view of the inside of the cutout portion of FIG. 1. FIG.
3 is a partial perspective view of FIG. 2.
4 is a view in which the movable contact is in the electromagnetic repulsion state (open state) with respect to FIG.
FIG. 5 is a view in which an insulating block is added in FIG. 4. FIG.

Example of embodiment

Fig. 1 is a front view showing a circuit breaker according to the first embodiment of the present invention, with a part cut away to show the inside. FIG. 2 is an enlarged view of a portion cut out in FIG. 1. 3 and 4 are perspective views in which the SOHO grid is removed from FIG. 2, and FIG. 3 shows a closed state, and FIG. 4 shows an electron repelling state. 5 is a diagram in which the blowout coil is covered with an insulating block in FIG. 4.

In Fig. 1, the cover 1 and the base 2 constitute a case of the circuit breaker 101, and are each formed of synthetic resin. The opening / closing mechanism part which is not shown in the base 2 is accommodated, The operation handle 3 which cooperates with this opening / closing part protrudes from the handle window hole 1a of the cover 1 to the surface of the cover 1, Can be operated by hand from the outside. Further, the left side on the surface of the circuit breaker 101 in the closed state is the power supply side terminal 4 connected to, for example, a power supply side wire (not shown), and the right side is an example. For example, it is a load side terminal 5 connected with a load side wire (not shown).

The fixed contact 7 is connected to the power supply side terminal 4 via the blowout coil 6, and the fixed contact 8 fixed to one end of the fixed contact 7 is connected to one end of the movable contact 9; By folding with the fixed contact 10, the circuit breaker 101 is opened and closed, i.e., switching of the converter is performed. This opening / closing is performed in accordance with the operation of the opening / closing mechanism section by connecting the crossbar 11 which engages the movable contactor 9 by an axis (not shown) to the opening / closing mechanism section.

In addition, the movable contactor 9 is connected to the load side terminal 5 via a movable supporter (not shown), a relay conductor, and an overcurrent trip device. Therefore, the current path in this closed state is the power supply terminal 4-blowout coil 6-fixed contact 7-fixed contact 8-movable contact 10-movable contact 9-movable Self-receiving-Relay conductor-Overcurrent trip device-Follow the path of load side terminal (5). By the operation of the overcurrent trip device according to the excess state of the current, the switch mechanism part is similarly operated correspondingly, and the electric current is cut off. The detailed description of the switch mechanism part and the overcurrent trip device is omitted.

Hereinafter, the trend of the arc at the time of short circuit interruption including the blowout coil 6 which becomes a main part of this invention is demonstrated. Moreover, the extinguishing device 12 is equipped with the arc grid 12a which cuts out the arc 13 (refer FIG. 2) which arises between the fixed contact 8 and the movable contact 10 at the time of a short circuit interruption. The arch runner 14 attracts the arc 13 to the arc extinguishing device 12. At this time, the arc contactor 9 denotes the movable contact 9 which is in the repulsive state by the electromagnetic repulsive force caused by the flow of the short circuit current. 9 '.

First, the blowout coil 6 has the shape shown in FIG. In other words, the current flowing from the power supply-side terminal 4 to the fixed contactor 7 is a path A, B,. In other words, it is a path following each path of L. Compared with FIG. 4, outcoil 6a, 6b opposes each other over the opening / closing range of the movable contactor 9 on both sides. Reference numeral 6c (see also Fig. 2) denotes a connecting portion for connecting both outcoils 6a and 6b, and is called a connection converter G. In addition, converter B (H) is the first arc suction converter, converter C (I) is the second arc suction converter, converter D (J) is the movable suction suction converter, and converter E (K) is the arc half power generation furnace. I shall call each. In addition, converter M leading to the stationary contact point 8 is a well-known moving field power generating furnace.

Next, with reference to FIGS. 2-4, the process to the extinction of the arc 13 at the time of a short circuit interruption is demonstrated. As is also clear from FIG. 2 or FIG. 3, since the directions of the movable magnetic field generator M and the converter N are opposite, the movable contactor 9 rotates clockwise on the page of FIG. An arc 13 occurs between the contact 8 and the stationary contact 10. The arc 13 causes the short-circuit current to continue to flow while limiting current. However, as shown in FIG. 4, the converter sign on the movable self-suction path D (J, hereinafter, blowout coil 6b side is omitted without omission. Since the directions of the converter N of the mover and the mover are the same at this time, the movable contactor 9 tries to face the open position as the movable contactor 9 'at the time of opening. This is the reason why converter D is called an "operating self-suction" converter.

On the other hand, as is also clear from Fig. 2, since the arc 13 is directed from the bottom of the ground upwards to the direction of the arc reaction path E, the arc 13 is extinguished through the arc runner 14 by a blow action. Attracted toward grid 12a, i.e., attracted arc 13 '. This is the effect of providing the bending point of the arc-furnace E and the movable magnetic-plate F to the load side (right side on the ground of FIG. 2) of the fixed contact 8.

In the process of moving to the open position of the movable contact 9 ', the first arc suction converter B also contributes greatly. That is, when the movable contactor 9 on the ground of FIG. 2 reaches between the opened movable contactor 9 ', the first arc suction converter B is in the same direction as the arc 13. As the attracting arc 13 ', it is attracted more quickly to the SOHO grid 12a. This is why converter B is called "arc suction" converter.

At this time, the arc is sufficiently current-limited, but the blow action is also weakened. Therefore, since the arc is easy to move, it is necessary to cope with resurgence as the arc 13. Thus, with a second arc suction converter C in the same direction as the attracted arc 13 ′, with the current to the archog 12a as the arc 13 ”more attracted, the deeper ( 2) on the left side of the page.

As a result, the arc 13 "is sufficiently extended and cooled, and cutting is performed by the SOHO grid 12a, so that annihilation, i.e., short circuit interruption, is completed. In other words, as is clear from the foregoing description. And the first arc suction converter B, the second arc suction converter C and the movable suction suction converter D are installed in the blowout coil 6, and the first arc suction converter B is connected to the SOHO grid 12a. It is located approximately in the middle and the tip 9a of the movable contact 9 is located between the first arc suction path B and the arc half power generation path E, which contributes to blocking the larger short circuit current. As a result, the magnitude of the breaking capacity can be evenly provided as a variation of the product without changing the outline, so that the circuit breaker can be stored without worrying about the magnitude of the power supply capacity or the distance from the power supply capacity, especially on the user side. Of the design of the switchboard We can expect much effect that standardization can be achieved.

Also, as can be seen from Fig. 2, since the extinguishing device 12 is accommodated between the blowout coils 6a and 6b on both sides, the blowout coils 6a on both sides with the SOHO grid 12a interposed therebetween. It is necessary to consider 6b) not to short circuit. For this purpose, it is possible to consider interposing an insulating barrier between the blowout coils 6a and 6b on both sides and the SOHO grid 12a. For example, as shown in FIG. 8 and only the arc runner 14 may be exposed, and the blowout coil 6 may be covered with the insulating block 15. In this case, as is well known, steam is generated when the arc 13 comes into contact with the insulating block 15, so that the arc 13 is more deformed by the pressure difference between the back pressure of the arc 13 and the front pressure. It becomes easy to move to the left on the ground of 2. In addition, the guide 15a is a guide for accommodating the extinguishing device 12.

However, since the blowout coil 6 can also be applied as a so-called current-limiting resistor, for example, if the rated current exceeds 30 A, the material is copper, and if it is 30 A or less, the shape is not changed in the manner of iron. By changing, the press die can be shared, and even if the rated current of the product increases, standardization of the design can be achieved, and manufacturing cost can also be suppressed. In particular, in the case of 30 A or less, when the blow-out characteristic at the time of energizing short circuit current of the member which comprises an overcurrent trip device is considered, the current-limiting effect by the blowout coil 6 can be expected. In addition, in this invention, although the fixed contact 7 and the blowout coil 6 were demonstrated as a separate member, when the thickness conditions etc. which were called fixing of the fixed contact 8 are satisfied, as shown in FIG. The tip of the blowout coil 6b may be bent and integrated with the blowout coil 6 as the fixed contact portion 6d.

2: base 3: operation handle
4 power supply terminal 6 blowout coil
6c: connection part 7: fixed contactor
8: fixed contact 9: movable contactor
10: movable contact 11: crossbar
12 arc extinguishing device 13 arc
101: circuit breaker

Claims (9)

An opening / closing mechanism portion provided between the frame plates facing each other and having an operation handle,
A crossbar pivoting with the opening / closing mechanism;
A movable contactor interlocked with the crossbar and having at least one movable contact;
A fixed contact having a fixed contact repeating the movable contact and folding;
An arc extinguishing device for cutting an arc generated between said movable contact and said fixed contact;
It has a base for receiving the opening and closing mechanism and the extinguishing device,
A circuit breaker in which a power supply side terminal fixed to the fixed contactor and the base is electrically connected by a blowout coil,
And a first arc suction path and a second arc suction path that attract the arc to the arc extinguishing device in the blowout coil. The method according to claim 1,
The circuit breaker characterized in that the position at the time of electromagnetic repulsion of the movable contactor and the movable suction suction path provided in the blowout coil are arranged in a substantially straight line when viewed from the front. The method according to claim 2,
A circuit breaker characterized in that the blowout coils face each other centering on a movable contact by providing a connection portion. As a circuit breaker comprising a power supply terminal, a blowout coil, a fixed contact having a fixed contact, a movable contact having a movable contact, a load side terminal, and an arc extinguishing device,
The blowout coil,
A first arc suction converter attracting the arc generated between the movable contact and the fixed contact to the arc extinguishing device;
A second arc suction converter connected to the first arc suction converter,
A movable magnetic suction converter connected to the second arc suction converter,
An arc counter power generation furnace connected to the movable suction circuit;
Movable self-generated furnace connected with the arc-ban generator
Equipped with
And the first arc suction path is provided between the second arc suction path and the arc half power generation path as viewed from the front. The method of claim 4,
A circuit breaker characterized in that the movable contact and the movable magnetic attraction converter at the time of opening are arranged in a straight line when viewed from the front. The method of claim 4,
And a front end of the movable contact is provided between the first arc suction path and the arc half power generation path. The method of claim 4,
A bent part is provided between the arc-bed power generating furnace and the movable magnetic-plate generating furnace.
And said fixed contact point of said fixed contactor is provided between said first arc suction path and said bent portion as viewed from the front. The method according to any one of claims 4 to 7,
The blowout coil,
Connection path, first blowout coil and second blowout coil
Equipped with
And said first blowout coil and said second blowout coil are opposed to each other with respect to said movable contact, and are connected by said connection path. The method according to claim 7,
And an insulating block provided between the first blowout coil and the second blowout coil.

Images