JP2979688B2 - 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.

[0002]

2. Description of the Related Art FIG.
FIG. 1 is a cross-sectional view showing a conventional circuit breaker disclosed in Japanese Patent Application Laid-Open Publication No. H10-207, in which reference numeral 2 denotes a movable contact to which a movable contact 1 is fixed, 3 denotes a fixed contact that comes into contact with / separates from the movable contact 1, and 4a denotes a schematic contact. The fixed contact upper conductor portion 4b which is formed horizontally and has the fixed contact 3 fixed at one end is connected substantially vertically and is connected to the other end of the fixed contact upper conductor portion 4a where the fixed contact 3 is not fixed. The fixed contact mechanism side conductor 4c is fixed substantially horizontally and is connected to an end of the fixed contact mechanism side conductor 4b to which the fixed contact upper conductor 4a is not connected. Contact lower conductor, 4d
Are fixed contact terminal side conductors connected to the ends of the fixed contact lower conductors 4c which are not connected to the fixed contact mechanism side conductors 4b, 4 are fixed contacts 3, The fixed contact formed from the fixed contact upper conductor 4a, the fixed contact mechanism side conductor 4b, the fixed contact lower conductor 4c, and the fixed contact terminal side conductor 4d, and the periphery of the fixed contact 3 7 is a fixed contact 4
Fixed contact connecting conductor for electrically connecting the terminal 6a to the
b is a terminal paired with the terminal 6a, 8 is an arc-extinguishing grid, 9 is a mechanism for opening and closing the movable contact 2, 10 is a detector for detecting abnormal current, and 11 is a connection between the movable contact 2 and the terminal 6b. The movable contact connecting conductor 12 is a housing. The current path composed of the fixed contact upper conductor 4a, the fixed contact mechanism side conductor 4b, and the fixed contact lower conductor 4c is substantially U
It is formed in a character shape. 13 is a handle, 14 is an exhaust port, and 15 is an arc extinguishing side plate.

FIG. 11 shows a state of connection of the movable contact 4, the pressure reflector 5 and the fixed contact connecting conductor 7.

[0004] In the following, the direction in which the movable contact 2 is separated from the fixed contact 3 by rotation is referred to as upward.

Next, the operation will be described. When energized,
The contacts are in a closed state, and the current is applied to the terminal 6a, the fixed contact connecting conductor 7, the fixed contact 4, the movable contact 2, and the detecting unit 1.
0, flows through the path of the movable contact connection conductor 11 and the terminal 6b. Next, when the mechanism section 9 is manually operated or the detection section 10 detects an abnormal current and sends an operation signal to the mechanism section 9, the mechanism section 9 operates to open the contact. However,
If the abnormal current is a short-circuit current, the movable contact 2 is repelled by an electromagnetic repulsion force before the operation of the mechanism section 9 and the contact is opened. An arc is generated between the contacts as the contacts are opened. In the arc generated between the contacts, since the fixed contact 4 is formed in a substantially U-shape, a magnetic field component generated by a current flowing through the fixed contact upper conductor 4a, which is a part of the fixed contact 4, and a movable contact Due to the magnetic field component created by the current flowing through 2,
It is stretched to the grid 8 side, and the arc voltage rises to limit the current. As time elapses, the opening distance increases and the length of the arc increases, and when the conductive high-temperature gas emitted from the arc also fills the vicinity of the surface of the upper end corner 4e of the fixed contact terminal-side conductor 4d, The arc foot is commutated from the fixed contact 3 to the corner 4e, and the arc positive column itself is
After being strongly contacted and cooled, the arc is extinguished.

[0006] During this series of current interruption operations, the arc is applied to the grid side by the magnetic field component generated by the current flowing through the fixed contact upper conductor portion 4a and the magnetic field component generated by the current flowing through the movable contact 2 as described above. The conductors in the arc-extinguishing space other than the fixed contact upper conductor 4a and the movable contact 2, ie, the fixed contact mechanism side conductor 4b, the fixed contact lower conductor 4c, A magnetic field component generated by a current flowing through the contact terminal-side conductor portion 4d and the fixed contact-connection conductor 7 exerts a force in a direction to push the arc back to the mechanism portion side.

In the breaking operation of a large current such as a short-circuit current, the initial opening speed largely depends on the repulsive force of the current flowing through the fixed contact upper conductor portion 4a and the current flowing through the movable contact 2, mainly. The magnetic field component generated by the current flowing through the fixed contact lower conductor 4c acts to weaken the repulsive force.

[0008]

The conventional circuit breaker is constructed as described above, and the fixed contact 4 is fixed to the fixed contact 3.
As viewed from above, the terminal is connected to one terminal 6a on the arc extinguishing device side by the fixed contact connecting conductor 7, so that a current component is generated that generates a force in the direction of pushing the arc back to the mechanism side. Therefore, there is a problem that the arc voltage cannot be effectively increased because the arc cannot be effectively extended, and the current limiting effect cannot be sufficiently obtained. Further, since the commutation to the corner 4e is unlikely to occur due to the force in the direction of pushing the arc back to the mechanism section side, the arc positive column does not sufficiently contact the grid 8 and the arc is not effectively cooled, There was a problem that sufficient blocking performance could not be obtained. In the breaking operation of a large current such as a short-circuit current, the current mainly flowing through the fixed contact lower conductor 4c prevents the opening speed at the beginning of the breaking operation from increasing, so that the current limiting performance at the beginning of the opening is sufficiently obtained. There was a problem that it could not be done.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has as its object to provide a circuit breaker having a sufficient current limiting effect and excellent breaking performance.

[0010]

A circuit breaker according to the present invention comprises a pair of first and second terminals provided at both ends of a container, and one end connected to the first terminal. is rotatably supported, repulsive extending in the direction of the second terminal
A first contact fixed to the tip of the repellent element, a second contact contacting with and separating from the first contact, the second contact fixed to one end and extending along the repellent element, and the other end The movable contact is rotatably supported, and is movable in response to overload current.
Mechanism for separating contacts , and anti- movable contact of the repellent element
It is arranged on the tentacle side almost in parallel with the repellent element in the closed state ,
Both ends of the second terminal and the movable contact are respectively
It has a conductor connected to the other end and increases the length of the repulsor.
Serial constitute less than that of the movable contact, and, the direction of the current flowing in the direction of the conductor of the current flowing through the Hanpatsuko when energized are those configured to be the same.

[0011]

According to the circuit breaker of the present invention, a repulsor and a movable contact having one end joined to a contact and the other end rotatably supported are provided. A conductor arranged approximately parallel to the repulsor on the side opposite to the movable contact , and the length of the repulsor is smaller than that of the movable contact
Configured, and, since the direction of the current flowing in the direction a conductor of current flowing through the Hanpatsuko when energized is configured to be the same, at the time of large current such as a fault current, Hanpatsuko a movable contact
Anti the suction effect of the repulsion and Hanpatsuko conductor child
The armature and the movable contact open rapidly, and the passing current is rapidly limited at the beginning of the breaking operation. In addition, the repulsor that has rotated to the maximum opening position is held at the opening position by a strong electromagnetic attraction force due to the current flowing through the conductor because the distance to the conductor is short. Therefore, a sharp drop in the arc voltage due to the rebound of the repellent element can be prevented, and the sharply rising arc voltage can be maintained at a high level. As a result, the interruption time of an accident current or the like can be shortened, and the energy passing through the circuit can be reduced. Also, rebound until just before the current interruption
Can be held to the child in maximum opening position, largely taking the distance between the contacts during blocking, without breakdown by recovery voltage generated between the contacts is generated, it can be blocked reliably current.
As described above, not only the peak current at the time of interrupting the fault current but also the passing energy can be reduced, and furthermore, the interruption failure due to the insulation breakdown between the contacts can be prevented, so that the current limiting performance and the interruption performance are extremely excellent. Circuit breaker is obtained. Furthermore, in the present invention, the length is longer than that of the movable contact.
The short moment of inertia reduces the moment of inertia and the same electromagnetic opening force
Resiliently opens even if it receives
A conductor in which the current flows in the same direction is placed on the child
So, compared to placing the conductor above the movable contact
Low peak current and low passing energy during fault current interruption
The degree of current limiting performance improvement due to reduction is extremely large, and
The effect of preventing the failure of the interruption due to the rebound is also great.

[0012]

[Embodiment 1] An embodiment of the present invention will be described below with reference to the drawings. FIG.
In the figure, 2 is a movable contact having a movable contact 1 fixed to a tip portion, 3 is a fixed contact to which the movable contact 1 is separated and separated, 4 is a fixed contact having a fixed contact 3 fixed to a tip portion, and 7a is A portion 7b of the fixed contact connecting conductor 7 for electrically connecting the fixed contact 4 and the detecting unit 10 is connected to the detecting unit 10 and the first terminal 6b.
Is a flexible conductor at another part of the fixed contact connecting conductor 7 electrically connecting the conductors. 11 electrically connects the second terminal 6a of the movable contactor 2 and the grid 8 side, a portion 11 a is arranged substantially parallel to and near the fixed contact 4, a portion 11 b is composed of a shunt Movable contact connecting conductor, 12 is a housing, 16 is a rotation center of the movable contact 2, 18 is a spring, 20
Reference numerals a and 20b denote screws for connecting the terminals 6a and 6b to external conductors, respectively. The first and second terminals 6b and 6a are provided in pairs on both sides of the housing 12, and the fixed contact 4 is connected to the first terminal 6b and extends in the direction of the second terminal 6a. . The movable contact connecting conductor 11 is connected to the second terminal 6.
a, and extends in the direction of the first terminal 6 b substantially parallel to and near the fixed contact 4, and is connected to the other end of the movable contact 2.

Next, the operation will be described. When energized,
The contacts 1 and 3 are closed, and the current flows through the second terminal 6a.
The path of the movable contact connection conductor 11, the movable contact 2, the fixed contact 4, a part 7a of the fixed contact connection conductor, the detection unit 10, the other part 7b of the fixed contact connection conductor, and the first terminal 6b is shown. Flow through. Next, when the mechanism section 9 is manually operated or an abnormal current is detected by the detection section 10 and an operation signal is sent to the mechanism section 9, the mechanism section 9 operates to open the contacts 1 and 3. However, if the abnormal current is a short-circuit current, the mechanism 9
Prior to the operation, the movable contact 2 is repelled by the electromagnetic repulsive force and the contact is opened. With the separation of contacts 1 and 3,
An arc occurs between the three. The arc generated between the contacts
A magnetic field component generated by a current flowing through all conductors existing in the arc-extinguishing space, that is, a magnetic field component generated by currents (indicated by arrows in the drawing) flowing through the fixed contact 4, the movable contact 2 and the movable contact connecting conductor 11, respectively. , The arc voltage is rapidly increased to effectively limit the current. With the passage of time, as the opening distance increases and the arc is stretched further, the arc positive column itself becomes the grid 8
Very strong contact, and is rapidly cooled and extinguished. In blocking during operation of the series of current, with a current component on the force to stretch an arc on the grid 8 side is increased by a current amount flowing through the moving contact connection conductor 1 1 than in the conventional example shown in FIG. 10, Unlike the conventional example, there is no current component that exerts a force in the direction of pushing the arc back to the mechanism section 9 side. In the breaking operation of a large current such as a short-circuit current, a part of the movable contact connecting conductor 11 is arranged substantially parallel to and near the fixed contact 3, so that the opening speed is fixed at the initial stage of the opening operation. And movable contact connecting conductor 1
1 and the current flowing through the movable contact 2. At this time, the current component for repelling the movable contact 2 is twice as large as that in the conventional example shown in FIG. 10 and there is no current component for preventing the repulsion. The current is very rapidly limited at the beginning of the operation.

Embodiment 2 FIG. In the embodiment shown in FIG. 1, the detection unit 10 is provided in the middle of the fixed contact connection conductor 7, but as shown in FIG. 2, the detection unit 10 is provided in the middle of the movable contact connection conductor 11. May be provided.

Embodiment 3 FIG. In the embodiment shown in FIG. 1, the movable contact connecting conductor 11 is arranged substantially horizontally.
a and the shunt 11b, but as shown in FIG. 3, the end of the conductor 11a opposite to the terminal 6a is raised upward to connect the conductor 11a and the shunt 11b above the fixed contact connecting conductor 7. May be.

Embodiment 4 FIG. Further, in another embodiment shown in FIG. 3, a part of the conductor 11a is provided substantially horizontally and along one side surface of the fixed contact 4, but as shown in FIG. May be provided so as to be substantially horizontal and sandwich the fixed contact 4. Thus, when a part of the conductor 11a is provided so as to sandwich the fixed contact 4, the symmetry of the magnetic field generated by the current flowing through the conductor 11a is improved, and the movable contact 2 can be efficiently repelled. .

Embodiment 5 FIG. Further, in each of the above embodiments, nothing is connected to the end of the fixed contact 4 to which the fixed contact 3 is fixed, but as shown in FIG. 5, an arc runner 19 is fixed to the end. May be. In FIG. 5, since the arc runner 19 is fixed to the end, the arc generated by the opening operation is driven to the tip of the arc runner 19, and the arc positive column (not shown) is more strongly cooled by the grid 8 although not shown. At the same time, the consumption of the fixed contact 3 is reduced.

Embodiment 6 FIG. Further, in the embodiment shown in FIG. 1, it has formed the fixed contact 4 by a fixed conductor, the rotation center along the plane containing the trajectory drawn by the variable dynamic contact 2 as shown in FIG. 6 17 <br/> and Hanpatsuko formed by pivotally elastic supported conductors mainly, a portion of the moving contact connection conductor 11 as viewed from the position of Hanpatsuko 4 at make The movable contact 2 may be arranged in the opposite direction and in parallel. In FIG. 6, when a large current such as a short-circuit current flows, the repulsive action between the repulsor 4 and the movable contact 2 and
The repulsive element 4 is rapidly opened by the attractive action of the repulsive element 4 and a part of the movable contact connecting conductor 11, and the passing current is limited more rapidly at the beginning of the breaking operation than in the embodiment shown in FIG. Swept away. In addition, the repulsor 4 that has rotated to the maximum opening position
Is held at the opening position by a strong electromagnetic attraction force due to a current flowing through the conductor 11 because the distance from the movable contact connecting conductor 11 is short. Therefore, a sharp drop in the arc voltage caused by the rebound of the repellent element 4 can be prevented, and the rapidly rising arc voltage can be maintained at a high level. As a result, the interruption time of an accident current or the like can be shortened, and the energy passing through the circuit can be reduced. Further, since the repulsor 4 can be held at the maximum opening position until immediately before the current interruption, the distance between the contacts 1 and 3 at the time of interruption can be increased, and the dielectric breakdown does not occur due to the recovery voltage generated between the contacts 1 and 3. ,
The current can be reliably shut off. As described above, according to the present embodiment, not only the peak current when the fault current is interrupted but also the passing energy can be reduced, and furthermore, the interruption failure due to the insulation breakdown between the contacts can be prevented. A circuit breaker with excellent performance and breaking performance can be obtained. Also
Further, in this embodiment, the length is shorter than that of the movable contact.
Because the moment of inertia is small, it receives the same electromagnetic opening force
Repellents that open quickly and have large rebounds
In addition, since the conductor in which the current in the same direction flows is arranged,
Compared to placing the above conductor on the movable contact,
Reduction of peak current and passing energy during flow interruption
Current limiting performance is very large and
Also, the effect of preventing the failure of shutting down due to the heat is great.

Embodiment 7 FIG. Further, in the embodiment shown in FIG. 6, but was Hanpatsuko by the entire conductor is rotatably elastically supported, as shown in FIG. 7, as the Hanpatsuko only by rotatably elastically supported portion Is also good.

Embodiment 8 FIG. Further, in the other embodiment shown in FIG. 6, a part of the movable contact connecting conductor 11 is arranged below the repellent element 4 when closed.
As shown in FIG. 7, a part of the movable contactor connection conductor 11 may be provided along the lower surface of the repellent element 4 immediately below the repellent element 4 at the time of closing. In FIG. 7, a part of the movable contact connection conductor 11 is provided directly below the repulsor 4 at the time of closing along the lower surface of the repulsor 4, and thus flows through a part of the movable contact connection conductor 11. since the current is on the surface of rotation of Hanpatsuko 4, it is possible to efficiently suck the Hanpatsuko 4.

Embodiment 9 FIG. Further, in FIG. 7, the portion that rises above the shunt 11b side of the conductor 11a is provided symmetrically, but as shown in FIG. Either one may be used.

Embodiment 10 FIG. Further, in FIGS. 7 and 8, the order of some of the moving contact connection conductor 11 is provided directly below the Hanpatsuko 4 at make, Hanpatsuko 4 and a portion of the movable contactor connecting conductor at make Cannot be opened beyond the distance from Therefore, as shown in FIG. 9, a part of the movable contactor connection conductor 11 is repelled when closed.
By disposing them below the left and right of the child 4 and avoiding the surface on which the repulsor 4 rotates, it is possible to increase the distance over which the repulsor 4 can be opened.

[0023]

As described above, according to the present invention, the first and second terminals, one end of which are provided in pairs at both ends of the container, are connected to the first terminal and are rotatable. , The first contact fixed to the tip of the repulsor , the second contact coming into contact with and separating from the first contact, and the second contact It is fixed on one end by the anti
Movable with the other end rotatably supported along the sprout
The movable contact is opened in response to the contact and overload current.
Mechanism , and a closed state on the anti- movable contact side of the repulsor
Disposed substantially parallel to the above Hanpatsuko of state, comprising a conductor having both ends respectively connected to the other end of the second terminal and the movable contact, the length of the Hanpatsuko of the movable contact
Smaller and composed of objects, and, since the direction of the current flowing in the direction of the conductor of the current flowing through the Hanpatsuko when energized is configured to be the same, pass energy not only the peak current when a large current interruption even Can be kept small,
Furthermore, failure of interruption due to insulation breakdown between contacts can be prevented, so that there is an effect that a circuit breaker having extremely excellent current limiting performance and interruption performance can be obtained. Still further, in the present invention
Is shorter than the movable contact, so the moment of inertia
Is small, and opens quickly even under the same electromagnetic opening force.
If the rebound has a large rebound,
Since the conductor through which the current flows is placed, the above
Peak current at the time of fault current interruption compared to placing conductors
Of current limiting performance by reduction of flow and passing energy
But very large and failure to cut off due to bouncing
The effect of preventing is also great.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a circuit breaker according to one embodiment of the present invention.

FIG. 2 is a sectional view showing a circuit breaker according to another embodiment of the present invention.

FIG. 3 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 4 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 5 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 6 is a sectional view showing a circuit breaker according to another embodiment of the present invention.

FIG. 7 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 8 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 9 is a perspective view showing a main part of another embodiment of the present invention.

FIG. 10 is a sectional view showing a conventional circuit breaker.

11 is an enlarged side view showing a main part of FIG. 10;

[Explanation of symbols]

1 movable contact point 2 movable contact probe 3 fixed contact 4 fixed contact 6a second terminal 6b first terminal 11 a conductor

Continuation of the front page (56) References JP-A-55-154028 (JP, A) JP-A-55-163738 (JP, A) JP-A-63-193428 (JP, A) JP-A-61-285627 (JP) , A) (58) Fields investigated (Int. Cl. ⁶ , DB name) H01H 71/00-83/22

Claims (1)

(57) [Claims] A first terminal and a second terminal provided in pairs at both ends of a container are connected to the first terminal and supported rotatably, in the direction of the second terminal. Extend
A repellent element , a first contact fixed to the tip of the repellent element , a second contact contacting and separating from the first contact point, the second contact point fixed to one end and extending along the repellent element , and the other end Part is rotatably supported by a movable contact, responding to overload current
Mechanism for the movable contact opens away, and counterclockwise variable of the Hanpatsuko
The moving contact is disposed substantially in parallel with the repellent element in a closed state , and both ends thereof are the second terminal and the movable contact, respectively.
A conductor connected to the other end of the armature, the length of the repellent element
The constructed smaller than that of the movable contactor and the circuit breaker and the direction of the current flowing in the direction of the conductor of the current flowing through the Hanpatsuko is configured to be the same when energized.