JPH07114873A - Circuit breaker - Google Patents

Abstract

PURPOSE:To provide an undervoltage trip device for a circuit breaker wherein a mover part can be turned after control voltage is applied by forcing the undervoltage trip device reset, even in a condition that the control voltage of specified value or more is not applied to the undervoltage trip device and even in a condition that the mover part is normal. CONSTITUTION:A reset acting part 12 is provided in another end 5b of an acting lever 5A in an undervoltage trip device 1, and this reset acting part 12 is brought into contact with both a mover part 8 opened at trip time and a mover part 8 opened at ordinary time. Inn this way, the acting lever 5A is turned against a trip spring 6, and also a latch 4, released from this turned acting lever 5A, is turned by a latch spring 9 to reset a movable core 3 to a reset position.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a movable element provided with an undervoltage trip device, which is normally turned off by operating a handle, is tripped overcurrent, or is automatically tripped by tripping a coil using a control power source. Part separation distance (normal off <
Automatic trip) is configured differently.

[0002]

2. Description of the Related Art An undervoltage trip device for a circuit breaker is capable of turning on the circuit breaker when the control voltage is above a specified value and the electromagnet of the device is in an attracting state. In this case, the attracted state of the electromagnet cannot be maintained, and the movable core of the electromagnet is released to prevent the circuit breaker from automatically tripping or the circuit breaker being turned on.

In order to miniaturize the electromagnet of the undervoltage trip device, the movable iron core in the released state is not attracted by the attraction force of the electromagnet, and the movement of the mechanism is utilized to move the movable iron core regardless of the presence or absence of the control voltage. There is a method in which the circuit breaker is turned on by keeping the electromagnet in an attracting state when the control voltage is applied forcibly and the control voltage is applied in that state.

FIG. 6 is a diagram showing an ON state of the mover portion, FIG.
6 is a diagram showing the moment when the undervoltage trip device is activated in FIG. 6, FIG. 8 is a diagram showing a state of automatic trip, FIG. 9 is a diagram showing a state after reset, that is, a normal off state, and FIG. 10 is a diagram showing before reset. It is a figure which shows the OFF state of.

In the ON state of FIG. 6, the control voltage applied to the coil 2 of the undervoltage trip device 1 drops below a specified value, the movable iron core 3 is released, and the latch 4 and the operating lever 5 are engaged. Is disengaged and trip lever 6 activates lever 5
When the trip bar 7 is rotated in the clockwise direction (the momentary state is shown in FIG. 7), the opening / closing mechanism (not shown) of the circuit breaker is operated, and the mover section 8 is moved to The ON state shown in the figure trips to the automatic trip state shown in FIG.
In the automatic trip state shown in FIG. 8, the actuating lever 5 of the undervoltage trip device 1 is rotated counterclockwise by the mover portion 8 against the trip spring 6 and is urged by the latch spring 9. Rotates counterclockwise, and the movable iron core 3 returns to the direction of the fixed iron core 10. If a control voltage equal to or higher than a specified value is applied to the coil 2 in the state of FIG. 8, the mover is reset by operating the operation handle (not shown) to turn on the circuit breaker as shown in FIG. Even if the portion 8 moves to the normal off position, as shown in FIG.
Since the adsorbed state is maintained and the trip bar 7 is also returned by the operation handle, the circuit breaker can be turned on.

When such a circuit breaker is installed in each circuit of the commercial power source / emergency power source switching device, a circuit breaker with an electric operating device is often used for automatically switching the circuit. The circuit breaker installed on the power supply side of the circuit waits for the operation handle to be in the normal off state so that the operation handle can be immediately turned on when necessary.

However, as described above, in the automatic trip state of the mover portion 8 shown in FIG. 8, if the control voltage above the specified value is not applied to the coil 2, the operation handle is kept in the normal automatic trip state. Also, as shown in FIG. 10, the trip bar 7 is activated, and the state shown in FIG. 8 is restored. That is, unless the reset operation is performed once after the control voltage of the specified value or more is applied, the normal off state cannot be waited. This type of circuit breaker is known from, for example, Japanese Utility Model Publication No. 1-25402, and therefore its detailed description is omitted.

[0008]

The conventional circuit breaker has the following problems.
When an automatic trip occurs, the operating handle is set to an intermediate position between on and off, so when turning on again, the operating handle is once operated in the off direction to reset the engagement of the trip latch of the opening / closing mechanism. After doing)
The operation handle is being operated in the on direction.

In the above-mentioned conventional circuit breaker, the circuit breaker automatically operates as shown in FIG. 8 after the undervoltage trip device 1 is excited as shown in FIG. When the trip occurs, the latch 4 is released from the actuating lever 5 that is pushed up by the mover portion 8 and rotates against the trip spring 6, thereby causing the latch 4 to move.
Is rotated by the latch spring 9 and the movable iron core 3 is fixed to the fixed iron core 1.
The suction is retained by returning to the suction direction of 0. By the above-described reset operation in the state of FIG. 8, even if the mover portion 8 is separated from the operating lever 5 as shown in FIG. 9, the state in which the movable iron core 3 is attracted is maintained. At this time, trip bar 7
Is released from the actuating lever 5 and returns as shown in FIG. 9, so that it can be turned on again.

However, when the above-described reset operation is performed when the undervoltage trip device 1 is not excited, the movable iron core 3 is released and the latch 4 rotates against the latch spring 9 as shown in FIG. The latch lever 4 is disengaged and the operating lever 5 is rotated by the trip spring 6 to rotate the trip bar 7, but the mover portion 8 in the off position causes the operating lever 5 to move to the trip spring 6. Since the lever 5 is not returned by being opposed, the operating lever 5 does not engage with the latch 4, and the trip bar 7 remains in the trip state. Therefore, there is a problem that the operation handle cannot be held in the off state and the circuit breaker cannot be turned on again.

The present invention has been made in order to solve the above problems, and by allowing the operation handle to be set to the off position even when the undervoltage trip device is in the non-excitation state, there is no reset operation after re-excitation. The purpose is to obtain a circuit breaker that can be turned on again.

[0012]

In the circuit breaker according to the present invention, a reset actuating portion is provided on an actuating lever of an undervoltage trip device, and a mover portion returns the actuating lever in an automatic trip state and at the same time, a normal operation is performed. It is designed to be restored even in the off state.

[0013]

According to the present invention, the mover unit returns the actuating lever at the automatic trip position, and even if the mover unit reduces the opening distance to the normal off state by the reset operation of the circuit breaker, Return the operating lever.

[0014]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. 1 is a diagram showing an ON state of a mover portion, and FIG. 2 is a diagram shown in FIG.
Showing the moment when the undervoltage trip device operates at
3 is a view of FIG. 2 from the left, FIG. 4 is a view showing a state of an automatic trip, and FIG. 5 is a view showing a normal off state. And the description is omitted.

In the figure, reference numeral 5A designates an operating lever rotatably supported by a support shaft 11. One end 5a abuts the other end 4a of the latch 4 in the direction against the latch spring 9 as in the conventional operating lever 5. , The other end 5b faces the mover portion 8 in a direction that opposes the opening direction, and the intermediate portion 5c has a trip bar 7
Opposite the direction to trip to. Reference numeral 12 denotes a reset operation portion formed by extending the other end 5b of the operation lever 5A,
13 is a reset actuating portion 1 from the other end 5b of the actuating lever 5A.
The concave portion formed over 2 is provided to avoid interference with the mover portion 8 during an automatic trip. 14 is a latch 4
A roller rotatably provided on the other end 4a of the operating lever 5
Sliding contact with one end 5a of A and engaging.

In FIG. 1, the circuit breaker is in the ON state, a control voltage of a specified value or more is applied to the coil 2 of the undervoltage trip device 1, and the movable iron core 3 receives the clockwise urging force of the latch 4. It has overcome and is adsorbed to the fixed iron core 10. The biasing force of the latch 4 at this time is generated by the roller 14 receiving the clockwise biasing force of the operating lever 5A by the trip spring 6.

When the voltage applied to the undervoltage trip device 1 falls below a specified value, the attraction force of the movable iron core 3 decreases, and the urging force of the latch 4 cannot be endured.
The slanted surface of a and the roller 14 are disengaged, and the operating lever 5A
Rotates clockwise. At this time, the intermediate portion 5c of the actuating lever 5A rotates the trip bar 7 in the clockwise direction, and the state shown in FIG. 2 is obtained. Then, the mover unit 5A automatically trips to the state shown in FIG. In this state, the operating lever 5A is rotated counterclockwise by the mover portion 8 by the reset operating portion 12 being pushed up against the trip spring 6, and the latch 4 is rotated counterclockwise by the latch spring 9. Then, the movable iron core 3 is forcibly returned to the fixed iron core 10 side.

Further, even when the operating handle is reset to turn on the mover section 8 and brought into the normal OFF state shown in FIG. 5, the reset lever 12 of the operating lever 5A is reset by the mover section 8. Since it is pushed up against the spring 6, it is held as it is, and the movable iron core 3 is kept in the returned state.

In this state of FIG. 5, if a control voltage of a specified value or more is applied to the undervoltage trip device 1, the mover portion 8 can be turned on, and the movable iron core 3 is attracted to the operating lever. 5A is held in the state shown in FIG. However, in the state of FIG. 5, when the mover portion 8 is turned on in the state where the control voltage above the specified value is not applied, the movable iron core 3 is released and the operating lever 5A is rotated by the trip spring 6 as shown in FIG. Then, the mover unit 8 automatically trips.

When the reset actuating portion 12 is provided on the actuating lever 5A as described above, the movable element 8 normally turns off the actuating lever 5A even when the actuating lever 5A is in the automatic trip state (state of FIG. 4) (state of FIG. 5). However, the operation handle can be set to the off position even when the undervoltage trip device 1 is not excited.

Example 2. If the operating lever 5A is provided with the recessed portion 13 as shown in FIGS. 1 to 5, interference with the mover portion 8 is avoided during automatic trip as shown in FIG. 4, and it is not pushed up excessively. It is possible to prevent the undervoltage trip device 1 from unreasonably returning at the automatic trip position, reduce the mechanical load on the device, and improve the durability performance.

Example 3. If the latch 4 is provided with the roller 14 as shown in FIGS. 1 to 5, the frictional force between the operating lever 5A and the latch 4 can be reduced and the friction can be stabilized. Therefore, the undervoltage trip device 1 The falling voltage can be stabilized.

Example 4. If the shape of the actuating lever 5A is determined as shown in FIGS. 1 to 5, the turning position (rotation angle) of the actuating lever 5A is the same between the automatic trip shown in FIG. 4 and the normal off state shown in FIG. Therefore, the clearance between the operating lever 5A and the adjacent parts can be reduced, and the device can be downsized.

[0024]

As described above, according to the present invention, the operation handle can be set to the off position even when the undervoltage trip device is in the non-excitation state, so that the re-excitation can be performed again without the reset operation. It is possible to obtain the effect that the state can be changed.

[Brief description of drawings]

FIG. 1 is an ON state diagram of a mover unit showing an embodiment of the present invention.

FIG. 2 is a diagram showing an instant when the undervoltage trip device in FIG. 1 is activated.

FIG. 3 is a diagram of FIG. 2 seen from the left.

FIG. 4 is a diagram showing a state of automatic trip.

FIG. 5 is a diagram showing a normal off state.

FIG. 6 is an ON state diagram of a mover portion showing a conventional one.

FIG. 7 is a diagram showing the moment when the undervoltage trip device in FIG. 6 is activated.

FIG. 8 is a diagram showing a state of automatic trip.

FIG. 9 is a diagram showing a normal OFF state after reset.

FIG. 10 is a diagram showing an off state before resetting.

[Explanation of symbols]

 1 Undervoltage trip device 2 Coil 3 Movable iron core 4 Latch 5A Actuating lever 5a One end of actuating lever 5b Other end of actuating lever 5c Intermediate part of actuating lever 6 Trip spring 7 Trip bar 8 Movable part 9 Latch spring 10 Fixed iron core 11 Spindle 12 Reset operation part 13 Recess 14 Roller

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshiaki Kobayashi 1-8 Midoricho, Fukuyama-shi Fukuyama Works, Mitsubishi Electric Corporation

Claims (4)

[Claims] 1. An undervoltage trip device provided with an opening distance at the time of automatic trip of a mover portion larger than an opening distance at a normal time, wherein the undervoltage trip device is a fixed iron core. , A movable iron core facing the movable iron core, a coil surrounding both iron cores, a latch whose one end engages with the movable iron core and is rotated by the reciprocating motion of the movable iron core, and the latch is urged in the rotation direction. A latch spring for returning the excited movable core to the attraction direction, and the other end of the latch abuts one end in a direction against the latch spring, and the other end resists the mover portion in its opening direction. And a trip spring that biases the actuating lever in the direction of abutting the latch, and is rotatable. Undervoltage subtraction The movable core is attracted when a voltage of a predetermined value or more is applied to the device, and when the applied voltage becomes a predetermined value or less, the movable core is released and the latch rotates against the latch spring. A circuit breaker in which the actuating lever is rotated by a trip spring to actuate the trip bar to trip, a reset actuating portion is provided at the other end of the actuating lever, and the reset actuating portion is opened at the time of tripping. By making contact with both the movable member and the movable part that is normally opened, the operating lever rotates against the trip spring and the latch released from the rotated operating lever is rotated by the latch spring. A circuit breaker, wherein the movable core is moved to reset to a return position. 2. The circuit breaker according to claim 1, wherein the other end of the actuating lever is provided with a recess for avoiding interference with the mover part at an extension part in the moving direction of the mover part during an automatic trip. . 3. The circuit breaker according to claim 1, wherein a roller is interposed between the other end of the latch of the undervoltage trip device and one end of the operating lever. 4. The contact position between the actuating lever of the undervoltage trip device and the mover part is the open position of the mover part during an automatic trip and the open position of the mover part during normal trip. 2. The circuit breaker according to claim 1, wherein the circuit breaker has substantially the same height with respect to the spindle of the operating lever.