JP3228002B2 - Circuit breaker - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circuit breaker, and more particularly to a circuit breaker suitable for preventing arcing, simplifying the structure, and greatly reducing the number of parts.

[0002]

2. Description of the Related Art A typical conventional circuit breaker includes a pair of fixed and movable contacts, an opening / closing mechanism for rotating the movable contact, a handle for finger operation, and the like. The movable contact is transmitted to rotate, and one end of the movable contact comes into contact with and separates from the fixed contact. Then, when an accident current such as a large current flows in the electric circuit composed of both contacts, the tripping mechanism operates, and this movement is transmitted to the opening / closing mechanism, and the movable contact is separated from the fixed contact to cause the current to flow. Acts to block. The connection between the other end of the movable contact and the electric circuit is made of a bendable flexible conductor in which a metal wire is woven in a mesh shape so as not to affect the electrical connection even if it turns.
A toggle link is used as the opening / closing mechanism, and the movement of the tripping mechanism or the handle is transmitted to the movable contact. In addition, an arc extinguishing device is provided between the movable contact and the fixed contact to promote elimination of an arc generated at the time of interruption.

[0003] A conventional example of a current limiting structure using an electromagnetic repulsion force is as follows.
Contacts are provided at both ends of a movable contact whose center is pivotally supported, and two fixed contacts are arranged to face these contacts. When an accident current such as a large current flows through the electric path of the two contacts that are always in contact, the movable contact rotates and separates from the fixed contact due to the electromagnetic repulsion acting between the contacts. This configuration has a structure in which the movable contact rotates only by the electromagnetic repulsion.

[0004]

In the above prior art, since a flexible conductor is used for the wiring between the movable contact and the electric circuit, the man-hour for processing the connecting portion of the net-like metal wire is required, and the cost is increased. Further, the flexible conductor has the disadvantage that the life of the number of times of bending is relatively short, and the cross-sectional area is reduced due to the mesh shape, the density of the passing current increases, and heat is easily generated. Furthermore, since the toggle link is used for the opening / closing mechanism, there is a problem that the structure is complicated and the number of parts is large.

When an arc extinguishing device is used as a countermeasure for arcing at the time of interruption, the number of parts increases and the size of the product increases, and furthermore, it takes time to shift from the generation of the arc to the arc extinguishing grid. Even had limitations.

In the current limiting structure using the electromagnetic repulsive force, since the conductor of the movable contact passes through the center of rotation of the contact, it is difficult to maintain the insulation distance along the rotation driving axis of the movable contact, and it is difficult to maintain the insulation distance. Circuit breakers have the disadvantage that the electrical insulation distance between the phases is reduced.

An object of the present invention is to provide a circuit breaker capable of improving the breaking performance by suppressing the occurrence of arc, simplifying the structure, and greatly reducing the number of parts.

[0008]

In order to achieve the above object, the present invention provides a first fixed conductor on the power supply side and a second fixed conductor on the load side.
A fixed conductor, an intermediate fixed conductor interposed between the fixed conductors, and a first movable conductor and a second movable conductor between the fixed conductors on the power supply side and the load side and the intermediate fixed conductor, respectively. A conductor is provided, and a series electric circuit is formed by each of the conductors.

In a preferred embodiment, the first and second movable conductors are respectively provided between the first fixed conductor on the power supply side and the intermediate fixed conductor, and between the intermediate fixed conductor and the second fixed conductor on the load side. An opening / closing mechanism that opens and closes at substantially the same time may be provided, and one or more intermediate fixed conductors may be provided.

Further, the present invention relates to a circuit breaker, wherein a movable conductor rotating around a rotation axis, a first fixed conductor disposed opposite to one end of the movable conductor, and a movable conductor. A second fixed conductor disposed opposite to the end, a contact portion provided to electrically connect the first fixed conductor, the movable conductor, and the second fixed conductor in series, and an opening of the contact portion. An opening / closing means for rotating the movable conductor so as to simultaneously separate the movable conductor is provided, and the movable conductor is arranged at a position separated from the axis or a position separated from the rotation center of the opening / closing means.

Further, the present invention relates to a circuit breaker, wherein a movable conductor rotating around a rotation axis, a first fixed conductor disposed opposite one end of the movable conductor, and a movable conductor. A second fixed conductor disposed opposite to the end, a contact portion provided to electrically connect the first fixed conductor, the movable conductor, and the second fixed conductor in series, and an opening of the contact portion. Opening / closing means for rotating the movable conductor so as to perform the separation at the same time, and wherein the plurality of contact portions for achieving the electrical connection are arranged substantially in the same plane. is there.

[0012]

The movable conductor is disposed between the first fixed conductor and the intermediate fixed conductor and between the intermediate fixed conductor and the second fixed conductor, respectively, and the movable conductor is disposed between the first fixed conductor and the intermediate fixed conductor and between the first fixed conductor and the intermediate fixed conductor. Since it is provided to open and close between the second fixed conductors, an opening and closing mechanism can be constituted only by rigid conductors, and a flexible conductor (flexible conductor) conventionally required for electrical connection of the movable conductor becomes unnecessary. be able to. The opening and closing mechanism separates these movable conductors between the first fixed conductor and the intermediate fixed conductor and between the intermediate fixed conductor and the second fixed conductor substantially simultaneously, so that the separation distance per contact is reduced. Can be.

Further, since a plurality of contacts connected in series are simultaneously opened, the total opening speed between the contacts is increased, the current limiting effect can be enhanced, and the occurrence of arc at each contact is suppressed. By configuring the opening and closing mechanism to open and close by rotating or linear movement of the movable conductor, or by opening and closing by a couple acting on the movable conductor, the need for a toggle link can be eliminated, reducing the number of parts and simplifying the structure. Can be achieved.

Further, since the movable conductor is provided so as to rotate about the rotation axis and is disposed at a position separated from the axis or a position separated from the rotation center of the opening / closing means, the insulation distance between the poles is provided. Can be maintained.

[0015]

Embodiments of the present invention will be described below with reference to FIGS. A first embodiment of the present invention will be described with reference to FIGS. 1 to 6 and FIG. The configuration of the circuit breaker of this embodiment is shown in FIGS. In the present embodiment, a rotating member 4 as a holding member formed of an insulator in the housing is rotatably supported by a bearing 4c formed substantially in the center of the housing.
The housing is formed by the case 1, the mold cover 2, and the side plate 2a. The bearing 4c is formed on the inner surface of the mold cover 2 and the side plate 2a. In the case of an assembling method in which components such as the rotating member 4 are incorporated in the case 1 and covered with the mold cover 2 and the side plate 2a, the mold cover 2 and the side plate 2a may be integrated in advance, and the components such as the rotating member 4 In the case of the assembling method in which the case 1 is covered with the built-in side plate 2a, the case 1 and the mold cover 2 may be integrated in advance.

On the rotating member 4, a movable contact base 5a as a first movable conductor and a movable contact base 5b as a second movable conductor are fixedly supported. Movable contact bases 5a and 5
The b is mounted on the rotating member 4 by being clamped by protrusions 4d and 4e formed on the rotating member 4 or by being inserted into grooves formed on the rotating member 4, and the protrusions 4d and 4e of the rotating member 4 are formed.
The movable contact bases 5a and 5b are fixed to the rotating member 4 by the elastic force of the above or screwing of the rotating member 4 or the like. In this embodiment, the projection 4d is provided on the back surface of the contact 6 of the movable contact bases 5a and 5b, and the projection 4e is provided on the same side as the contact 6, and clamps the movable contact bases 5a and 5b therebetween. (Not shown in FIG. 2). The projection 4d also functions as a backrest to prevent deformation of each movable contact base due to contact pressure. Each of the movable contact bases 5a and 5b has a contact 6 serving as a movable contact at each end thereof, which is attached by silver brazing, caulking, or the like. The rotation member 4 rotates about a rotation center 4a, and the rotation center 4a is formed integrally with the rotation member 4 or is formed by a pin through which the rotation member 4 is inserted. An operation handle 3 is mounted on the rotating member 4 such that the tip end protrudes from the mold cover 2.
By N, an OFF operation (in FIG. 1, clockwise rotation is OFF and counterclockwise rotation is ON), the rotating member 4 rotates around the rotation center 4a. In the present embodiment, since the configuration of the terminal, the operation handle, and the external shape are made compatible with the conventional circuit breaker, there are no restrictions on the use of the circuit breaker, and the usability is not impaired.

The fixed contact base 8, which is a first fixed conductor, has a power supply terminal 8a at one end and a contact 6 serving as a fixed contact at the other end at a position facing the movable contact of the movable contact base 5a. Attached by silver brazing, caulking, or the like. An intermediate fixed contact base 7, which is an intermediate fixed conductor, is fixedly supported by the case 1 below the rotating member 4, and at both ends, contacts 6 as fixed contacts are opposed to the movable contacts of the movable contact bases 5a and 5b. At this point, it is attached by silver brazing, caulking, or the like.
The mounting portion of the intermediate fixed contact base 7 of the case 1 is a concave portion and is easy to position at the time of mounting, and is thinner than other portions, so that the device mounting plate 80 in the distribution board as shown in FIG. The heat generated by the intermediate fixed contact base can be effectively radiated to the device mounting plate 80 when it is mounted on the device mounting plate 80. A contact 6 as a fixed contact is attached to one end of the load-side conductor 9 as a second fixed conductor by silver brazing, caulking or the like at a position facing the movable contact of the movable contact base 5b. A load terminal 9a is provided. The fixed contact base 8, the movable contact bases 5a and 5b, the intermediate fixed contact base 7 and the load-side conductor 9 are made of a flat, rigid conductive material, for example, a copper flat bar or the like. The conductive material is not limited to copper, but may be a copper alloy such as iron-containing copper or another metal such as aluminum as long as it is a good conductor of electricity and heat and has a suitable elasticity to obtain a wipe of a contact. Is also good. In this embodiment, terminal fittings 10 for fixing the terminals of the wirings 82 and 84 connected to the power supply side terminal 8a and the load side terminal 9a when the distribution board is mounted are fastened by screws.

The load-side conductor 9 is connected from the fixed contact to the load-side terminal 9.
On the way to a, the current passes through the current transformer 11 for detecting the current of the electric circuit and extends to the load side. The output of the current transformer 11 is supplied to an overcurrent detection circuit 12. The overcurrent detection circuit 12 has a circuit configuration as described in, for example, Japanese Patent Application Laid-Open No. 57-170023, and the state in which the current of the electric circuit, that is, the current flowing through the load-side conductor 9 exceeds the rated value is determined as the time-delay characteristic. If it continues for more than the time, an output for driving the overcurrent trip device 13 is generated. The overcurrent trip device 13 is disclosed in, for example,
No. 89529, the plunger 13a is normally attracted by the attraction force of the permanent magnet, and the output of the overcurrent detection circuit 12 reversely excites the attraction force of the permanent magnet to weaken the plunger. 13a protrudes and pushes the driving member 4b (not shown in FIG. 1) of the rotating member to rotate the rotating member 4 clockwise to open the four contacts substantially simultaneously.

FIG. 1 shows a state where the circuit breaker is "ON". When the circuit breaker is manually turned "OFF" from this state, the operation handle 3 is moved rightward in FIG. Rotation causes the four movable contacts and the fixed contacts to be substantially simultaneously opened. Manual “ON” operation is “OF”
The operation is performed by reverse operation of F ", and the operation handle 3 is moved to the left from the OFF position in the figure to rotate the rotating member counterclockwise to simultaneously contact the four movable contacts and the fixed contacts.

In this embodiment, since the fixed contact base 8, the movable contact bases 5a and 5b, the intermediate fixed contact base 7 and the load-side conductor 9 are formed of a plate-shaped rigid conductive material, the conventional contact base 8 is formed. The use of flexible conductors, which are mostly used in circuit breakers, eliminates the problem of wire fraying and breaking, which limits the life of circuit breakers, which is a problem with conventional circuit breakers. Disappears.

In this embodiment, the contact opening / closing mechanism is of a rotary type, and the contact configuration is four-point in series. The rotary type eliminates the need for a toggle link or the like, greatly simplifies the circuit breaker mechanism, improves the assemblability, and reduces the cost of the product. In addition, the mechanism is greatly simplified, so that the life of the circuit breaker can be extended.

Further, since the arc energy at the time of opening is greatly reduced by the four-contact configuration in series, arc generation at each contact is suppressed, and the arc extinguishing device is eliminated or the arc extinguishing device is large and small. Can be achieved. Furthermore, when the short-circuit current is interrupted, the short-circuit current is greatly suppressed by the four series contacts, so that there is no restriction on the wiring support structure on the user side, the heat capacity of the load equipment, the selection of the upper and lower circuit breakers, etc. The benefits are great.

Here, the interruption phenomenon at the time of interruption of the short-circuit current of the circuit breaker will be described with reference to FIGS. When a short circuit fault occurs in a circuit, a large current flows through the circuit. The large current causes the contacts to repulsively open, thereby generating an arc voltage between the contacts and suppressing the short-circuit current. This is called current limiting, after which the mechanism of the circuit breaker operates and bears the recovery voltage between the contacts to complete the interruption.

FIG. 4 is a circuit diagram of an equivalent circuit when a short circuit fault occurs.
Shown in Here, the following relational expression holds.

[0025]

(Equation 1)

Here, the arc voltage va is most affected by the displacement of the movable contact stand. As a result of various experiments, the arc voltage is approximated as shown in FIG. 5, and is expressed by the equations (2), (3) and (4).

[0027]

(Equation 2)

[0028]

(Equation 3)

[0029]

(Equation 4)

Here, when the current limiting value at each time is calculated, the current limiting values are as shown in Expressions 5, 6, and 7.

[0031]

(Equation 5)

[0032]

(Equation 6)

[0033]

(Equation 7)

[0034] Here the number 5, 6 and number 7, the current when the arc voltage is not generated (estimated short-circuit current), v _0,
It is a value obtained by subtracting an expression representing a suppression current due to the arc voltage generation of a (tt- ₁ ) and b (tt- ₂ ) ² . The suppression current is represented by Expressions 8, 9, and 10.

[0035]

(Equation 8)

[0036]

(Equation 9)

[0037]

(Equation 10)

The [0038] above, limiting values at each time when the iv _0, ia and estimated short-circuit current than ib was i _0, the number 11, is as few 12 and number 13, iv _0,
ia and ib limit the estimated short circuit current as shown in FIG.

[0039]

[Equation 11]

[0040]

(Equation 12)

[0041]

(Equation 13)

Further, when i is applied to both sides of the equation (1) and the integration is completed until the interruption is completed, the equation (14) is obtained.

[0043]

[Equation 14]

As can be seen from equation (14), the energy supplied from the power supply is divided into energy consumed in the circuit and arc energy consumed in the arc-extinguishing chamber of the circuit breaker. Performance for blocking the circuit breaker from above, the rise of the arc voltage _{(t 1, t 2, a} , b) and dictated by the size of the heat capacity of the arc extinguishing chamber. Therefore, in order to improve the breaking performance, at least the rising of the arc voltage has only to be accelerated. In the case of a circuit breaker having a series multiple contact configuration, the breaking performance is greatly improved. In the simple two-contact configuration of the contacts having the same configuration, according to the above-described numerical calculation of the arc voltage approximation, it is possible to suppress the generation of arc energy of about １ ／ in the entire two contacts, and to reduce the arc energy of １ ／ per arc extinguishing device. You just have to consume it.

Since the arc energy decreases as the number of contacts increases, the actual breaking distance decreases as the number of pairs of contacts increases, as shown in Table 1, as compared with the required breaking distance for the rated current.

[0046]

[Table 1]

Next, a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment (FIGS. 1 to 3), an example of a single-pole circuit breaker has been described.
1. A fixed contact block 8 as a first fixed conductor of each pole and a movable contact block as a first movable conductor on both sides of a rotating member 24 in one housing formed by the mold cover 22 and the side plate 2a. 5a, an intermediate fixed contact table 7 as an intermediate fixed conductor, a movable contact table 5b as a second movable conductor,
A load-side conductor 9 as a second fixed conductor is arranged in parallel,
This is a two-pole product. In the present embodiment, between the power supply terminals 8a and between the load terminals 9a for interphase insulation between two poles.
An insulating barrier 22a is formed between them. As shown in FIG. 8, the rotation member 24 has its center of rotation 24a rotatably supported by a bearing 24c formed on the inner surface of the mold cover 22 and the side plate 2a. Movable contact base 5a
The mounting of 5 and 5b on the rotating member 24 is carried out by clamping with projections 4d and 4e (not shown in FIG. 7) formed on the rotating member 24 as in the first embodiment. Also in this embodiment, the projection 4d is provided on the back surface of the contact 6 of the movable contact bases 5a and 5b, and the projection 4e is provided on the same side as the contact 6, and clamps the movable contact bases 5a and 5b therebetween. (Not shown in FIG. 7). Also in the present embodiment, a current transformer 11 is mounted on the load-side conductor 9, and the output of the current transformer 11 is supplied to an overcurrent detection circuit 12. When the current trip device 13 is driven, the plunger 13a protrudes and the driving portion 4b
To rotate the rotating member 24 clockwise to open the four contacts substantially simultaneously.

The structure of the other parts is basically the same as that of the first embodiment. In this embodiment, the movable contactors 5a and 5b for two poles can be simultaneously operated by one rotating member 24. By further developing, it can be easily applied to three-pole and four-pole products, and can sufficiently cope with commonly used three-pole structures. FIG. 9 shows the appearance of three poles in addition to two poles.

A third embodiment of the present invention will be described with reference to FIGS. In this embodiment, a multi-pole circuit breaker is formed by connecting a single-pole circuit breaker to the side. The basic configuration of each pole is the same as in the first embodiment. This embodiment shows a case of three poles, and a handle 3 and a rotating member 4 connected to the handle 3 are provided at the center pole similarly to the first embodiment. At the poles on both sides, a rotating member 4f having no connection with the handle 3 is provided. A through hole is provided in the partition wall at the boundary of each pole at a position corresponding to the rotation center of the rotating member, and the rotation center of the rotating members 4 and 4f of each pole is connected to the connecting member 4j.
And the three poles are simultaneously opened and closed by operating the handle 3 or by tripping one of the three poles. In this embodiment, by connecting the required number according to the number of poles, FIG.
As shown in (1), circuit breakers having various numbers of poles such as one pole, two poles, and three poles can be manufactured.

A fourth embodiment of the present invention will be described with reference to FIGS. This embodiment shows an example in which the contact structure is a current limiting repulsion type, and the breaking performance is further enhanced. FIG. 14 shows the overall structure of this embodiment. In this embodiment, the fixed contact base 28, the intermediate fixed contact base 27, the load-side conductor 29 and the case 31,
Except for the mold cover 32, the same components as in the first embodiment have the same configuration. In this embodiment, the fixed contact table 2
8, a U-shaped groove is provided near the fixed contact so as to surround the fixed contact so that the direction of the current is opposite to the direction of the current of the movable conductor. The tongues 28b, 2 are provided inside the U-shaped groove, respectively.
7a and 29b are formed. These tongue pieces 28b,
The current passing directions of the fixed conductor and the movable conductor opposed by 27a and 29b are set to be opposite to each other, and when a large current passes (when a short-circuit current occurs), a repulsive force acts between the fixed and movable contacts by the action of the electromagnetic force to open. By shortening the pole time, a large short-circuit current suppression (current limiting) effect can be obtained.
FIG. 15 shows the details of the portion A. Part A is the intermediate fixed contact block 2.
7 and shows the facing portion of the movable contact child table 5a, by the action of the U-shaped groove and tongue provided on the intermediate fixing contact child base 27, the direction B ₁ and the tongue 27a of the current flowing through the movable contact child table 5a the orientation B ₂ of the current flowing through the electromagnetic repulsion force becomes opposite occurs. The current limiting repulsion structure, as shown in FIG. 16 in addition to the U-shaped groove, bending the intermediate fixed contact child base 27 in a U-shape, orientation B ₁ and U-shaped current through the movable contact child table 5a orientation B ₂ of the current flowing through the bent portion tongue piece 27a may be a structure which generates an electromagnetic repulsive force as reverse.

A fifth embodiment of the present invention will be described with reference to FIG. In this embodiment, three movable conductors 55a, 55b, and 55c and two intermediate fixed conductors 57a and 57b are housed in a housing including a case 51 and a mold cover 52. In this embodiment, the number of contact points is three, and the breaking performance can be improved. Other parts are the same as in the first embodiment.

A sixth embodiment of the present invention will be described with reference to FIG. In the present embodiment, the structure of the rotating member is changed from the disk-shaped one seen in the other embodiments to a substantially X-shaped rotating member 74. The rotation center 74a of the rotating member 74 is rotatably supported by the bearings 4c, 24c, etc. like other members. The rotating member 74 holds the movable contact bases 5a and 5b.
4d and 74e are formed. The projection 74d is provided on the back surface of the contact 6 of the movable contact bases 5a and 5b.
Are provided on the same side as the contact 6. The projection 74d also functions as a backrest, and prevents deformation of each movable contact base due to contact pressure. Other portions may use any of the first to fourth embodiments.

A seventh embodiment of the present invention will be described with reference to FIGS. In this embodiment, the width of the movable conductor is set to be large, and a plurality of contacts 56 are fixed as shown in FIG. In the present embodiment, the first fixed conductor 8 on the power supply side and the second fixed conductor on the load side are provided in a space formed by the insulating walls 2 and 2a of the housing which are arranged substantially in parallel at a predetermined distance. A conductor 9, a movable conductor 5a, 5b interposed between the first fixed conductor and the second fixed conductor, and an intermediate fixed conductor 7; a first fixed conductor, a second fixed conductor, and a movable conductor; Are formed of wide electric conductors, and the relationship between the width (a) of the wide conductor and the distance (b) between the insulating walls of the housing is a.
<B ≦ 3a. The range of b is preferably 1.1a ≦ b ≦ in relation to the thickness of the rotating member.
3a. The entire configuration is the same as the configuration of the first embodiment, and preferably, the rotary member 4 in the configuration of the first embodiment is replaced with the rotary member 74 described in the sixth embodiment. FIG. 19A is a schematic view showing the positional relationship of a conventional one, and the conductor of the movable contact is formed to be narrow in relation to the arc extinguishing device. 20A to 20E show various modifications of the contact. Reference numerals 57 and 58 denote cylindrical contacts.
Is a cylindrical contact having a substantially spherical head. By providing a plurality of these in the form of a wide conductor, the current per contact can be reduced to suppress arcing.

An eighth embodiment of the present invention will be described with reference to FIGS. In this embodiment, a pin 12 is provided between the first fixed conductor 108, the intermediate fixed conductor 107, and the second fixed conductor 109.
5 movable conductors 105a and 105b whose rotation centers are pivotally supported.
The movable conductors 105a and 105b are simultaneously opened and closed by an interlocking member 104 connected to a sliding handle 103. A unit in which the current transformer 111, the overcurrent detection circuit 112, and the overcurrent trip device 113 are integrated is stored in the case 101 and the cover 102. The functions of the current transformer 111, the overcurrent detection circuit 112, and the overcurrent trip device 113 are the same as those in the first embodiment. In this embodiment, when an overcurrent is detected, the actuator 113a is attracted, and the interlocking member 104 moves to the right in the drawing by the spring 120 to open the contact. As shown in FIG.
By adding the movable conductor 7b and the movable conductor 105c, it is possible to realize a circuit breaker with six points.

A ninth embodiment of the present invention will be described with reference to FIG. This embodiment is a circuit breaker configured to be opened and closed by a push button 203. The basic configuration is the same as in the eighth embodiment. In the present embodiment, the movable conductors 205a and 205b whose rotation centers are pivotally supported by the pins 125 are linked by a link 242 so that they are linked to each other, and the engagement portion of the rotation member 240 which is coaxially supported by the pins 125 of the movable conductor 205a. A pin 242a provided on a link 242 is engaged with 240a. FIG. 23 shows an ON state in which the button 203a is pressed down. When the button 203b is pressed down, the rotating member 240
Rotates clockwise to open the contacts.

FIG. 24 shows a tenth embodiment of the present invention.
FIGS. 9A, 9B and 9C show a rotating member 304 provided with a handle 303 provided with movable conductors 305, 315 and 325, respectively, which are arranged so as not to pass through the center of rotation 304a. It is configured to secure a distance. 308 is a first fixed conductor, and 309 is a second fixed conductor.

Next, an eleventh embodiment of the present invention is shown in FIG. This embodiment expresses only the structure around the contact. In this embodiment, as in the first embodiment, the rotating member 4 rotates in the direction of the arrow, but the fixed contact base 38, the intermediate fixed contact base 37, and the load-side conductor 39 are arranged in the thickness direction of the rotating member. The movable contact 6 of the movable contact bases 35a and 35b and the fixed contact 6 slide. In this embodiment, since the contacts slide largely due to the operation of opening and closing the contacts, the contact state of the contacts is stabilized. Furthermore, in comparison with Example 1,
There is an advantage that the contact arrangement structure can achieve a large thickness and save space.

Next, a twelfth embodiment of the present invention is shown in FIG. This embodiment is an extension of the fourth embodiment described above,
The three poles of the contact are formed on one rotating member 34. In this embodiment, the fixed contact table 48U, the intermediate fixed contact table 47U, the load-side conductor 49U, and the movable contact table 45U are provided for each phase corresponding to the three phases U, V, and W phases.
a, 45Ub, fixed contact block 48V, intermediate fixed contact block 47V, load-side conductor 49V, and movable contact block 45V
a, 45Vb, fixed contact base 48W, intermediate fixed contact base 47W, load-side conductor 49W, and movable contact base 45W
a, 45 Wb are respectively provided, and O
The structure is N, OFF. The present embodiment can be made even thinner than the eleventh embodiment, but since the opening distance between the contacts cannot be made large, it is optimal as a configuration of a small-capacity circuit breaker.

[0059]

According to the present invention, it is possible to obtain a circuit breaker capable of improving the breaking performance by suppressing the occurrence of arc, simplifying the structure, and greatly reducing the number of parts.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an internal configuration of a circuit breaker according to a first embodiment of the present invention.

FIG. 2 is a perspective view showing a state in which a cover of the circuit breaker according to the first embodiment of the present invention is attached.

FIG. 3 is a sectional view showing an internal configuration of the circuit breaker according to the first embodiment of the present invention.

FIG. 4 is a circuit diagram showing an equivalent circuit when the circuit breaker according to the first embodiment of the present invention is short-circuited.

FIG. 5 is a characteristic curve diagram showing a relationship between arc voltage and time of the circuit breaker according to the first embodiment of the present invention.

FIG. 6 is a characteristic curve diagram showing a current limiting effect of the circuit breaker according to the first embodiment of the present invention.

FIG. 7 is a perspective view showing an internal configuration of a circuit breaker according to a second embodiment of the present invention.

FIG. 8 is a sectional view showing an internal configuration of a circuit breaker according to a second embodiment of the present invention.

FIG. 9 is a perspective view showing an appearance of a circuit breaker according to a second embodiment of the present invention.

FIG. 10 is a perspective view showing an internal configuration of a circuit breaker according to a third embodiment of the present invention.

FIG. 11 is a sectional view showing an internal configuration of a circuit breaker according to a third embodiment of the present invention.

FIG. 12 is a perspective view showing an appearance of a circuit breaker according to a third embodiment of the present invention.

FIG. 13 is a perspective view showing a state in which the circuit breaker according to the first embodiment of the present invention is mounted on a distribution board.

FIG. 14 is a perspective view showing an internal configuration of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 15 is a perspective view illustrating a contact configuration of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 16 is a perspective view showing a contact configuration of a circuit breaker according to a fourth embodiment of the present invention.

FIG. 17 is a perspective view showing an internal configuration of a circuit breaker according to a fifth embodiment of the present invention.

FIG. 18 is a perspective view illustrating a configuration of a rotating member of a circuit breaker according to a sixth embodiment of the present invention.

FIG. 19 is a plan view showing the relationship between the spacing between the partition walls and the conductor width of the circuit breaker according to the seventh embodiment of the present invention.

FIG. 20 is a perspective view illustrating a configuration of a contact point of a circuit breaker according to a seventh embodiment of the present invention.

FIG. 21 is a side sectional view showing an internal configuration of a circuit breaker according to an eighth embodiment of the present invention.

FIG. 22 is a side sectional view showing a main part of a circuit breaker according to an eighth embodiment of the present invention.

FIG. 23 is a side sectional view showing an internal configuration of a circuit breaker according to a ninth embodiment of the present invention.

FIG. 24 is a side sectional view showing a main part of a circuit breaker according to a tenth embodiment of the present invention.

FIG. 25 is a perspective view showing a main part of a circuit breaker according to an eleventh embodiment of the present invention.

FIG. 26 is a perspective view showing a main part of a circuit breaker according to a twelfth embodiment of the present invention.

[Explanation of symbols]

3, 103: handle, 4, 24, 34, 54, 74:
Rotating member, 5a, 5b, 35a, 35b, 45Ua, 4
5Ub, 45Va, 45Vb, 45Wa, 45Wb, 5
5a, 55b, 105a, 105b, 105c, 205
a, 205b: movable conductor, 7, 37, 47U, 47V,
47W, 57a, 57b, 107, 107a, 107
b: intermediate fixed conductor, 8, 28, 38, 48U, 48V,
48W, 108: 1st fixed conductor, 9, 29, 39, 4
9U, 49V, 49W, 109: second fixed conductor, 1
1: current transformer, 12: current detection circuit, 13: overcurrent trip device.

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takayuki Yamazaki 46-1, Tomioka, Nakajo-cho, Kitakanbara-gun, Niigata Pref.Industrial Equipment Business Division, Hitachi, Ltd. (72) Inventor Kiyoshi Nishikawa 4-chome, Kanda Surugadai, Chiyoda-ku, Tokyo 6 Hitachi, Ltd. (72) Inventor Takashi Igarashi 4-6-1 Kanda Surugadai, Chiyoda-ku, Tokyo Hitachi, Ltd. (56) References JP-A-6-28961 (JP, A) JP-A-1- 206522 (JP, A) JP-A-55-154028 (JP, A) JP-B-29-5430 (JP, B1) JP-B-39-36871 (JP, Y1) (58) Fields investigated (Int. Cl. ⁷ , DB name) H01H 73/02 H01H 73/18

Claims (22)

(57) [Claims] 1. A first fixed conductor on a power supply side and a second fixed conductor on a load side.
Fixed conductor, an intermediate fixed conductor interposed between the first fixed conductor and the second fixed conductor, and a first movable member disposed between the first fixed conductor and the intermediate fixed conductor. A circuit breaker comprising: a conductor; and a second movable conductor disposed between the intermediate fixed conductor and the second fixed conductor. 2. The opening and closing of the first and second movable conductors at substantially the same time between the first fixed conductor and the intermediate fixed conductor and between the intermediate fixed conductor and the second fixed conductor, respectively. The circuit breaker according to claim 1, further comprising a mechanism. 3. The apparatus according to claim 1, wherein each of the first and second movable conductors is attached to a holding member substantially made of an insulating material in an electrically insulated state. 2. The circuit breaker according to 2. 4. The opening / closing mechanism rotates the movable conductor by rotating the holding member about one rotation axis, thereby performing an opening / closing operation between each fixed conductor and the movable conductor. The circuit breaker according to claim 3, wherein the circuit breaker is configured as follows. 5. The opening / closing mechanism is configured to linearly move the holding member in one direction to linearly move the movable conductor, thereby performing an opening / closing operation between each fixed conductor and the movable conductor. The circuit breaker according to claim 3, wherein 6. The first and second movable conductors are rotatably supported around respective rotation axes, and the opening and closing mechanism opens and closes by applying a couple to the respective movable conductors. 3. The circuit breaker according to claim 2, wherein the circuit breaker is configured to perform an operation. 7. A first fixed conductor on a power supply side and a second fixed conductor on a load side.
Fixed conductor, a first and a second intermediate fixed conductor interposed between the first fixed conductor and the second fixed conductor, and between the first fixed conductor and the first intermediate fixed conductor. , A second movable conductor disposed between the first intermediate fixed conductor and the second intermediate fixed conductor, a second intermediate fixed conductor and the second And a third movable conductor disposed between the two fixed conductors. 8. A first fixed conductor on a power supply side and a second fixed conductor on a load side.
, One or more (N) intermediate fixed conductors interposed between the first fixed conductor and the second fixed conductor, and one or more (N) disposed between the fixed conductors. N + 1
Circuit breaker, comprising: 9. A first fixed conductor on the power supply side fixed to the housing, a second fixed conductor on the load side fixed to the housing, and the first fixed conductor and An intermediate fixed conductor interposed between the second fixed conductors and fixed to the housing; a holding member substantially made of an insulating material and movable relative to the housing; A first movable conductor attached to a holding member and disposed between the first fixed conductor and the intermediate fixed conductor; a first movable conductor attached to the holding member and attached to the intermediate fixed conductor; A second movable conductor disposed between the fixed conductors, and a first fixed conductor, a first movable conductor, an intermediate fixed conductor,
A contact provided at a contact portion of each of the conductors so as to be electrically connected in series in the order of a second movable conductor and a second fixed conductor, and an opening and closing operation for opening and closing a joint state between the conductors A circuit breaker, comprising: a plurality of contact portions for achieving an electrical connection, wherein the plurality of contact portions are arranged in substantially the same plane. 10. The holding member is configured to be rotatable around one rotation axis, and the plurality of contact portions in the electrical connection achieving surface are disposed substantially equidistant from the rotation axis. The circuit breaker according to claim 9, wherein: 11. A manual opening / closing operation means for relatively moving the holding member in an electric connection achieving surface, wherein an operation movement of the manual operating mechanism can achieve a relative movement in the electric connection achieving surface. The circuit breaker according to claim 9, wherein: 12. A structure in which the plurality of contact portions formed on the electrical connection achievement surface are arranged substantially in parallel for three poles for each pole, and the opening / closing mechanism is interlocked for three poles. The circuit breaker according to claim 9, wherein: 13. A housing, a movable conductor rotatable around one rotation axis in the housing, and a first fixed conductor on a power supply side disposed opposite to one end of the movable conductor. A load-side second fixed conductor disposed opposite to the other end of the movable conductor, and a first fixed conductor, a movable conductor, and a second fixed conductor that are electrically connected in series. A contact portion provided in the vicinity of an edge of the conductor; and opening and closing operation means for rotating the movable conductor so as to open and close the respective contact portions substantially simultaneously. A circuit breaker comprising an operation lever extending outside the housing, wherein the movable conductor is arranged at a position away from the axis so that the electric conductor is not arranged near the rotation axis. . 14. A rotatable holder rotatably provided with respect to a center of rotation, a first movable conductor and a second rotatable member held at predetermined positions of the rotatable holder separated from the center of rotation.
, A first fixed conductor disposed opposite to one end of the first movable conductor, and a second fixed conductor disposed between the other end of the first movable conductor and one end of the second movable conductor. An intermediate fixed conductor disposed therebetween, a second fixed conductor disposed opposite the other end of the second movable conductor, and the first fixed conductor;
A first movable conductor, an intermediate fixed conductor, a second movable conductor, a second
An electrical connection portion provided to electrically connect the fixed conductors in series, an opening / closing means for rotating the rotation holder so as to simultaneously open and close the electrical connection portion, and the first fixed conductor. Current detecting means for detecting a current flowing in a series circuit from the first fixed conductor to the second fixed conductor, and, based on an output of the current detecting means, urges the rotation holder in a direction for simultaneously opening the electrical connection portion. A circuit breaker comprising a tripping means. 15. A power supply side first space in a space formed by an insulating wall of a housing which is arranged substantially parallel at a predetermined distance.
A fixed conductor, a second fixed conductor on the load side, and a movable conductor interposed between the first fixed conductor and the second fixed conductor. The first fixed conductor and the second fixed conductor And the movable conductor is made of a wide electric conductor, and the relationship between the width (a) of the wide conductor and the distance (b) between the insulating walls of the housing is such that a <b ≦ 3a. A circuit breaker characterized by comprising. 16. The circuit breaker according to claim 15, wherein a plurality of contacts are provided along a width direction of each of said wide conductors. 17. A multi-pole circuit breaker, comprising: a first movable conductor having contacts at both ends; and a second movable conductor electrically separated from the first movable conductor and having contacts at both ends. A movable conductor, a first fixed conductor provided so as to contact one contact of the first movable conductor, and one end contacting the other contact of the first movable conductor and the second movable conductor A second fixed conductor provided so that the other end thereof is in contact with one of the contacts, and a third fixed conductor provided so as to be in contact with the other contact of the second movable conductor. A holding member for holding the first movable conductor and the second movable conductor of the plurality of poles at predetermined positions for each pole so as to be capable of relative movement, and at least one of the plurality of poles The third above
Current detecting means for detecting the current of the fixed conductor, and the contact of the first movable conductor and the second movable conductor is connected to the first fixed conductor and the second movable conductor based on the output of the current detecting means. Tripping means for driving the fixed conductor and the third fixed conductor in the direction of separating from the contact, and a first movable conductor, a second movable conductor, a holding member, a first fixed conductor,
A second fixed conductor, a third fixed conductor, a housing accommodating the connecting member, the current detecting means, and the tripping means, and a contact between the first movable conductor and the second movable conductor of each pole; A circuit breaker comprising: opening and closing means for relatively moving the holding member so as to open and close the contacts of the first fixed conductor, the second fixed conductor, and the third fixed conductor. 18. A circuit breaker having a plurality of poles, comprising: a first movable conductor having contacts at both ends; and a second movable conductor electrically separated from the first movable conductor and having contacts at both ends. A movable conductor, and a holding member that is relatively movable and holds the first movable conductor and the second movable conductor at a predetermined distance from each other;
A first fixed conductor provided to be in contact with one contact of the first movable conductor, one end of which is in contact with the other contact of the first movable conductor and one contact of the second movable conductor A second fixed conductor provided so that the other end thereof is in contact with the second movable conductor, and a third fixed conductor provided so as to be in contact with the other contact of the second movable conductor. A connecting member for connecting the holding members of the respective members to interlock the opening and closing operation of each pole,
Current detection means for detecting a current of the third fixed conductor provided on at least one of the plurality of poles; and, based on an output of the current detection means, the holding member is connected to the first movable conductor and the second Tripping means for driving a contact of the movable conductor in a direction to separate from a contact of the first fixed conductor, the second fixed conductor, and the third fixed conductor; a first movable conductor of each pole; Movable conductor, holding member, first fixed conductor, second conductor
A fixed conductor, a third fixed conductor, a housing for accommodating the connecting member, the current detecting means and the tripping means, and a contact between the first movable conductor and the second movable conductor of each pole and the second fixed conductor. A circuit breaker comprising: opening and closing means for relatively moving the holding member so as to open and close the contacts of the first fixed conductor, the second fixed conductor, and the third fixed conductor. 19. The holding member is provided rotatably with respect to one center of rotation, and the first movable conductor and the second movable conductor of the plurality of poles are separated for each pole from the center of rotation. 19. The circuit breaker according to claim 17, wherein the circuit breaker is configured to be held at a position. 20. A first movable conductor having contacts at both ends,
A second movable conductor electrically separated from the first movable conductor and having contacts at both ends, and each contact of the first movable conductor and the second movable conductor is substantially one circumference. A holding member that holds the first movable conductor and the second movable conductor at a predetermined position so as to be positioned above, and is rotatably provided around a rotation axis that is the center of a circle where the contact point is located. A first fixed conductor provided so as to contact one contact of the first movable conductor; and a first fixed conductor provided at one end to contact the other contact of the first movable conductor, and A second fixed conductor provided so that the other end contacts one contact; a third fixed conductor provided so as to contact the other contact of the second movable conductor; A current detecting means for detecting a current of the fixed conductor; and Tripping means for driving the holding member in a direction in which the contacts of the first movable conductor and the second movable conductor are separated from the contacts of the first fixed conductor, the second fixed conductor, and the third fixed conductor; , The first movable conductor, the second movable conductor, the holding member, the first fixed conductor, the second fixed conductor, the third
Housing for accommodating the fixed conductor, the current detecting means and the tripping means, the contacts of the first movable conductor and the second movable conductor, and the first fixed conductor, the second fixed conductor and the third fixed conductor A circuit breaker comprising: opening and closing means for rotating the holding member so as to open and close the contact. 21. A multi-pole circuit breaker comprising a first movable conductor having contacts at both ends and a second movable conductor having contacts at both ends.
, A first fixed conductor provided so as to contact one contact of the first movable conductor, and one end contacting the other contact of the first movable conductor and the second movable A second fixed conductor provided so that the other end contacts one contact of the conductor, and a third fixed conductor provided so as to contact the other contact of the second movable conductor, provided at each pole; The first movable conductor and the second movable conductor of the plurality of poles are formed in a substantially disk shape and are rotatably provided with respect to the rotation center thereof. A holding member for holding the contact points of the first movable conductor and the second movable conductor on the periphery thereof, and detecting a current of the third fixed conductor provided on at least one of the plurality of poles. Current detecting means, and the holding member based on an output of the current detecting means. Tripping means for driving a contact of the first movable conductor and the second movable conductor in a direction to separate from a contact of the first fixed conductor, the second fixed conductor and the third fixed conductor; Polar first movable conductor, second movable conductor, holding member, first fixed conductor, second fixed conductor, third
A fixed conductor, a housing for accommodating the connecting member, the current detecting means and the tripping means, a contact of the first movable conductor and the second movable conductor of each of the poles, the first fixed conductor, A circuit breaker comprising: opening and closing means for rotating the holding member so as to open and close the contacts of the second fixed conductor and the third fixed conductor. 22. A plate-shaped first movable conductor having contact points at both ends, a plate-shaped second movable conductor having contact points at both ends, and a substantially disk-shaped, rotatable centering on the center thereof. A holding member that is freely provided and holds the first movable conductor and the second movable conductor at a predetermined position separated from the rotation center; and is provided so as to contact one contact point of the first movable conductor. A plate-like first fixed conductor, a plate-like second fixed contact provided with one end contacting the other contact of the first movable conductor and the other contact contacting one contact of the second movable conductor. 2
And a plate-shaped third fixed conductor provided to be in contact with the other contact of the second movable conductor.
And a detection circuit for detecting an overcurrent from an output of the current transformer. The output of the detection circuit causes the holding member to move the first movable conductor and the second Tripping means for rotating the contact of the movable conductor in a direction to separate from the contact of the first fixed conductor, the second fixed conductor, and the third fixed conductor; and the first movable conductor and the second movable conductor , A holding member, a first fixed conductor, a second fixed conductor, a third fixed conductor, a substantially rectangular parallelepiped housing for accommodating current detection means and tripping means, and the holding member at a corner in the housing. Arc extinguishing device disposed between the first and second movable conductors and the second fixed conductor and the first fixed conductor and the second fixed conductor;
A circuit breaker, comprising: an open / close handle for rotating the holding member so as to open / close the fixed conductor and the third fixed conductor.