JP4623535B2 - Circuit breaker - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a circuit breaker including an electromagnetic device for interrupting a main circuit.
[0002]
[Prior art]
Conventionally, as shown in FIGS. 6 and 7, the electromagnetic device 22 provided inside the circuit breaker 21 is a member having an exciting function on the substrate 23a of the L-shaped yoke 23 composed of the substrate 23a and the side plate 23b. A built-in oil dash pot 24 penetrates and is fixed by soldering or the like, and an electromagnetic coil 25 is wound around the outer periphery of the oil dash pot 24. The flexible coil 27 connected to the primary terminal 26 is connected to one end 25a of the electromagnetic coil 25, and the terminal plate 29 connected to the secondary terminal 28 is connected to the other end 25b. Near the upper end of the side plate 23b of the yoke 23, there is a movable iron piece 30 that can be tilted between a horizontal posture where the suction side 30a contacts the fixed iron piece 24a of the oil dash pot 24 and an inclined posture separated from the fixed iron piece 24a. In the state where the overcurrent is not generated in the main circuit, the suction side 30a of the movable iron piece 30 is maintained in the inclined posture by the spring 31 having one end attached to the side plate 23b of the yoke 23. When an overcurrent is generated in the main circuit, a current flows through the electromagnetic coil 25 to generate a magnetic field, and the fixed iron piece 24a at the upper end of the oil dash pot 24 attracts the suction side 30a of the movable iron piece 30 to the horizontal posture side. At this time, when the suction side 30a of the movable iron piece 30 is sucked by the fixed iron piece 24a, the tripping side 30b of the movable iron piece 30 operates the trip bar 32 to shut off the main circuit. When the circuit breaker 21 incorporates the zero-phase current transformer 33 for detecting leakage, the magnetic field generated by the electromagnetic coil 25 adversely affects the zero-phase current transformer 33.
[0003]
[Problems to be solved by the invention]
Therefore, in the conventional circuit breaker, the electromagnetic coil of one electromagnetic device among a plurality of electromagnetic devices is reversely wound with the electromagnetic coil of another electromagnetic device, and the magnetic field is generated in the reverse direction so as to cancel the magnetic fields. The effect of the magnetic field was reduced. For this reason, two types of electromagnetic coils, right-handed and left-handed, have to be prepared, resulting in high costs and complicated inventory management.
[0004]
[Means for Solving the Problems]
In view of the problems of the above-described conventional circuit breaker, an object of the present invention is to provide a circuit breaker that can reduce the influence of a magnetic field generated from an electromagnetic device with one kind of electromagnetic coil, and its structure is An L-shaped yoke composed of a substrate and a side plate, an oil dashpot containing a member having an excitation function fixed to the yoke, an electromagnetic coil wound around the outer periphery of the oil dashpot, Near the upper end of the side plate, the suction side is pivotably pivotable between a horizontal position where it contacts the fixed iron piece at the upper end of the oil dashpot and an inclined position away from the fixed iron piece, and the tripping side moves the trip bar. in the circuit breaker having a plurality of electromagnetic devices consisting of iron, other the direction of the current flowing to the solenoid of one electromagnetic device of the plurality of electromagnetic devices winding direction of the electromagnetic coil is formed in the same It is to have in the direction opposite to the direction of the current flowing through the electromagnetic coil of the electromagnetic device.
[0005]
Further, the electromagnetic coil of the electromagnetic device is to form both ends at substantially the same height and cut off one end of the electromagnetic coil according to the connection object .
[0006]
DETAILED DESCRIPTION OF THE INVENTION
According to the electromagnetic device for a circuit breaker according to claim 1, an L-shaped yoke comprising a substrate and a side plate, an oil dashpot containing a member having an excitation function fixed to the yoke, and an oil The electromagnetic coil wound around the outer periphery of the dashpot and the horizontal position in which the suction side contacts the fixed iron piece at the upper end of the oil dashpot near the upper end of the yoke side plate and the inclined position separated from the fixed iron piece capable pivoted, pulling the off side circuit breaker having a plurality of electromagnetic devices consisting of a movable iron piece to operate the trip bar, of one of a plurality of electromagnetic devices winding direction of the electromagnetic coil is formed in the same by that the direction of the current flowing through the electromagnetic coil of the electromagnetic device in the direction opposite to the direction of the current flowing through the electromagnetic coil of the other electromagnetic device, it is possible to reduce the influence of the magnetic field generated from the electromagnetic device
[0007]
According to the circuit breaker of the second aspect, the electromagnetic coil of the electromagnetic device is formed by forming both ends at substantially the same height and excising one end of the electromagnetic coil according to the connection object. The direction of the current flowing in the type of electromagnetic coil can be changed , and the electromagnetic coil can be easily connected to the conductor of the main circuit.
[0008]
【Example】
One embodiment of a circuit breaker according to the present invention will be described with reference to the accompanying drawings of FIGS.
[0009]
As shown in FIGS. 1 and 2, the electromagnetic device 2 provided in the circuit breaker 1 is an oil dash in which a member having an exciting function is incorporated in a substrate 3a of an L-shaped yoke 3 composed of a substrate 3a and a side plate 3b. The pot 4 penetrates and is fixed by soldering or the like.
[0010]
Although not shown in the oil dash pot 4, a magnetic plunger, a coil spring that urges the plunger toward the bottom of the oil dash pot 4, and oil of constant viscosity are accommodated from the upper opening, The opening is covered with a fixed iron piece 4a. An electromagnetic coil 5 is wound around the outer periphery of the oil dash pot 4.
[0011]
The tip of the electromagnetic coil 5 is connected to a flexible lead 7 connected to the primary terminal 6 or a terminal plate 9 connected to the secondary terminal 8. Here, for example, when the electromagnetic device 2 is provided in each of the L1 and L2 poles in the L1 and L2 circuit breaker 1, the L1 pole electromagnetic device 2a and the L2 pole electromagnetic device 2b flow in the direction in which the current flows. The direction is reversed. That is, the electromagnetic coil 5 of the electromagnetic device 2a having the L1 pole as shown in FIG. 2 has the flexible conductor 7 connected to one end 5a and the terminal plate 9 connected to the other end 5b. As shown in FIG. The electromagnetic coil 5 of the electromagnetic device 2b has a terminal plate 9 connected to one end 5a and a flexible lead 7 connected to the other end 5b.
[0012]
For this reason, as shown in FIG. 4, the one end 5a and the other end 5b of the electromagnetic coil 5 are formed at substantially the same height so that they can be connected to the terminal plate 9 whose arrangement is determined. As shown in FIGS. 2 and 3, when the flexible conductor 7 and the terminal plate 9 are connected to the electromagnetic coil 5, either the tip of the electromagnetic coil 5, for example, the electromagnetic coil 5 on the side to which the terminal plate 9 is connected. Cut off the tip of one and make it shorter than the other. Thereby, when connecting the flexible conducting wire 7 and the terminal board 9 to the electromagnetic coil 5 by spot welding etc., it becomes easy to perform a connection operation.
[0013]
By reversing the direction of current flow, the magnetic field generation directions of the L1 pole electromagnetic device 2a and the L2 pole electromagnetic device 2b are reversed and the magnetic fields cancel each other. Further, the influence on the zero-phase current transformer 10 and the like can be reduced.
[0014]
In addition, when the electromagnetic device is provided in each of the R, S, and T poles in the R, S, and T circuit breakers, the direction of the current flowing in the R, S pole, and the T pole electromagnetic Connect so that the direction of the current flowing through the device is opposite.
[0015]
Near the upper end of the yoke 3 side plate, there is a movable iron piece 11 that can be tilted between a horizontal posture where the suction side 11a contacts the fixed iron piece 4a at the upper end of the oil dash pot 4 and an inclined posture separated from the fixed iron piece 4a. It is pivotally attached.
[0016]
In a state where no overcurrent is generated in the main circuit, the suction side 11 a of the movable iron piece 11 is maintained in an inclined posture by a spring 12 having one end attached to the side plate 3 b of the yoke 3. When an overcurrent is generated in the main circuit, a current flows through the electromagnetic coil 5, and the fixed iron piece 4a at the upper end of the oil dash pot 4 attracts the suction side 11a of the movable iron piece 11 to the horizontal posture side. At this time, when the suction side 11a of the movable iron piece 11 is sucked by the fixed iron piece 4a, the tripping side 11b of the movable iron piece 11 operates the trip bar 13 to shut off the main circuit.
[0017]
In this embodiment, the electromagnetic coil 5 is left-handed, but the winding direction may be either right-handed or left-handed.
[0018]
Further, in this embodiment, the tip of the electromagnetic coil is bent upward and formed at the same height. However, as shown in FIG. 5, there is no problem even if the tip of the electromagnetic coil is provided downward in the electromagnetic device. The shape of the apparatus can be changed as appropriate.
[0019]
Further, although the flexible coil and the terminal plate are connected to the tip of the electromagnetic coil, the shape of the conductor constituting the main circuit is not limited.
[0020]
【The invention's effect】
As described above, the circuit breaker according to the present invention includes an L-shaped yoke composed of a substrate and a side plate, an oil dashpot containing a member having an excitation function fixed to the yoke, It is pivotable between the electromagnetic coil wound around the outer periphery and the horizontal posture where the suction side contacts the fixed iron piece at the upper end of the oil dashpot near the upper end of the yoke side plate and the inclined posture separated from the fixed iron piece. wear and, in a circuit breaker having a plurality of electromagnetic devices trip side composed of a movable iron piece to operate the trip bar, the one electromagnetic device of the plurality of electromagnetic devices winding direction of the electromagnetic coil is formed in the same Yu called by that in the direction opposite to the direction of the current flowing in the direction of the current flowing through the electromagnetic coil to the electromagnetic coil of the other electromagnetic device, it is possible to reduce the influence of the magnetic field generated from the electromagnetic device There is an effect.
[0021]
In addition, the electromagnetic coil of the electromagnetic device has both ends formed at substantially the same height, and the direction of the current flowing in one type of electromagnetic coil is changed by cutting off one end of the electromagnetic coil according to the connection object. Moreover, there is an excellent effect that the electromagnetic coil can be easily connected to the conductor of the main circuit .
[Brief description of the drawings]
FIG. 1 is a front view showing a circuit breaker according to the present invention.
2A and 2B show an electromagnetic device according to the present invention, in which FIG. 2A is a front view and FIG. 2B is a right side view of a main part.
FIGS. 3A and 3B show an electromagnetic device according to the present invention, in which FIG. 3A is a front view, and FIG.
4A and 4B show electromagnetic coils of an electromagnetic device according to the present invention, in which FIG. 4A is a front view and FIG. 4B is a right side view.
FIG. 5 shows a modified embodiment of the electromagnetic device according to the present invention, in which (a) is a front view and (b) is a right side view of a main part.
FIG. 6 is a front view showing a conventional circuit breaker.
FIG. 7 is a front view showing a conventional electromagnetic device.
[Explanation of symbols]
1 Circuit Breaker 2 Electromagnetic Device 2a L1 Electromagnetic Device 2b L2 Electromagnetic Device 3 Relay 4 Oil Dash Pot 5 Electromagnetic Coil 5a One End 5b Other End 6 Primary Side Terminal 7 Flexible Conductor 8 Secondary Side Terminal 9 Terminal Plate 10 Zero-phase current transformer 11 Movable iron piece

Claims (2)

An L-shaped yoke composed of a substrate and a side plate, an oil dashpot containing a member having an excitation function fixed to the yoke, an electromagnetic coil wound around an outer periphery of the oil dashpot, and the yoke Near the upper end of the iron side plate, the suction side pivots between the horizontal posture where it contacts the fixed iron piece at the upper end of the oil dashpot and the inclined posture separated from the fixed iron piece, and the tripping side has a trip bar. in the circuit breaker having a plurality of electromagnetic devices consisting of a movable iron piece to work, the direction of the current winding direction of the electromagnetic coil flows into one electromagnetic coil of the electromagnetic device of the same formed a plurality of electromagnetic devices A circuit breaker characterized by having a direction opposite to a direction of a current flowing in an electromagnetic coil of another electromagnetic device. 2. The circuit breaker according to claim 1, wherein the electromagnetic coil of the electromagnetic device has both ends formed at substantially the same height, and one end of the electromagnetic coil is cut off according to a connection object .

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