JP3161002B2 - Circuit breaker operating mechanism - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operating mechanism for opening and closing a circuit breaker.

[0002]

2. Description of the Related Art FIG. 7 is a side view showing an operating mechanism of a draw-out type circuit breaker. A vacuum valve 1 is housed in a separate insulating frame 2 for each phase and attached to a frame 3 with a trolley. FIG. 7 shows a state in which the vacuum valve 1 is shut off, and a charging rod 5 is arranged on the charging electromagnet 4. 8 and 9
FIG. 8 is a side view of a main part showing an instantaneous insertion state and an injection completion state of the apparatus of FIG. 7, respectively.

In FIG. 7, when the closing electromagnet 4 is excited by a closing coil (not shown), the closing rod 5
Is driven upward to push up a roller 8 attached to a latch lever 7 integrated with the opening / closing shaft 6 as shown in FIG. As a result, the opening / closing shaft 6 rotates clockwise in the figure against a blocking spring (not shown). Thereby, the movable electrode (not shown) in the vacuum valve 1 is pushed down through the contact spring 9, the opening / closing lever 10, the crank 11, and the insulating rod 12, and closes the path between the movable electrode and the fixed electrode (not shown).
At the same time, another roller 13 attached to the tip of the latch lever 7 rides on the pawl 14 as shown in FIG. The claw 14 is urged clockwise in the figure with the pin 17 as a fulcrum and stopped at the position shown in the figure by a spring (not shown) and a stopper. 14 nails for that
And the latch lever 7 remain locked. At the same time as the vacuum valve 1 is turned on, the contact of the auxiliary switch (not shown) opens, and the coil excitation of the turning-on electromagnet 4 is released.
As a result, the input rod 5 falls, and the state shown in FIG. 9 is obtained.
That is, in FIG. 9, the claw 14 and the latch lever 7 remain locked, and the vacuum circuit breaker 1 is held in the closed state.

In FIG. 9, reference numeral 15 denotes a tripping electromagnet of an electromagnetic tripping device. When a trip coil (not shown) of the trip electromagnet 15 is excited, the trip rod 16
Is protruded to the left in the figure and a trip lever 18 integrated with the claw 14
Is rotated counterclockwise to release the engagement with the roller 13.
As a result, the opening / closing shaft 6 rotates counterclockwise in the figure by the force of a spring (not shown) and returns to the closed state in FIG.

Although not shown in FIGS. 7 to 9,
The circuit breaker is further provided with a manual trip device as shown in FIGS. That is, FIGS. 10 to 13 are enlarged side views of a main part showing only the structure of a conventional operation mechanism of a circuit breaker, in particular, only a manual trip device. FIG. 10 is a closed state, and FIG. An instantaneous state immediately after that, FIG. 12 shows a state in which the latch lever 7 has been pulled out by manual operation, and FIG. 13 shows a state after completion of the manual tripping operation.

In FIG. 10, a roller 13 provided at the tip of the latch lever 7 is supported by a pin 19 so as to be freely rotatable. Further, the roller 13 rides on the claw 14 which rotates with the tripping lever 18 integrally and the pin 17 as a fulcrum. The manual release device is disposed on the near side of the figure with respect to the claws 14 and the support 9 fixed to the frame 3 (FIG. 7).
Attached to. That is, the trip shaft 21 is provided so as to be freely slidable in the left-right direction in the figure through the U-shaped frame 20 fixed to the support 9. A push button 21A is provided at the left end of the trip shaft 21, and a compression spring 22 is interposed between the push button 21A and the frame 20. The right end of the trip shaft 21 is provided with a screw portion 21B, and a nut 23 is fitted from the right side. Further, a lever 24 is interposed between the trip shaft 21 and the trip lever 18. The lever 24 is rotatably supported by a pin 26 fixed to the frame. Also, lever 2
4 has one end connected to a pin 25 fixed to the trip shaft 21 and the other end has a pin 2 projecting toward the trip lever 18 side.
7 are provided.

When the hand push button 21A is pressed rightward, the trip shaft 21 slides rightward, so that the lever 24 rotates counterclockwise in the figure. As a result, since the pin 27 comes into contact with the trip lever 18, the claw 14 also rotates counterclockwise around the pin 17 as a fulcrum, and the state shown in FIG. 11 is obtained. Since the latch between the latch lever 7 and the claw 14 is released, the latch lever 7 is also immediately rotated counterclockwise by 30 degrees, and is pulled out as shown in FIG. The claw 14 returns to the original position (FIG. 10) as shown in FIG. 13 by releasing the pressing of the hand push button 21.

[0008]

However, the conventional apparatus as described above has a problem that the circuit breaker is closed when an electric closing command is issued while the hand push button is pressed. That is, when the electric push-in command is erroneously issued while the hand push button 21A is pressed as in the state of FIG. 12, the throw-in rod 5 (shown in FIG. 8) pushes up the latch lever 7, so that the circuit breaker again Will be thrown. Although the circuit breaker must be a trip-priority mechanism by nature, the possibility remains that manual tripping cannot be performed with confidence. If the circuit breaker is connected to the actual circuit, the current will be turned on, which may cause a serious accident.

An object of the present invention is to provide an interlock so that a circuit breaker is never closed even when an electric closing command is issued during a manual trip operation.

[0010]

According to the present invention, in order to achieve the above object, according to the present invention, a closing rod protruding by exciting a coil of a closing electromagnet, and being rotated by the closing rod in a closing direction of a circuit breaker. Latch lever, an open / close axis that rotates in conjunction with this latch lever, an open / close lever that drives the circuit breaker to open / close in conjunction with this open / close axis, and a closed state with the latch lever locked And an electromagnetic trip device that includes a trip rod that protrudes by coil excitation of a trip electromagnet, and is pushed by the trip rod to rotate the claws and release the engagement between the claws and the latch lever. A manual release device that includes a trip shaft that is driven in the axial direction by manual operation, and that the pawl rotates by interlocking with the trip shaft to release the lock between the pawl and the latch lever. In the above, a stopper is provided on the trip shaft and a protrusion is provided on the latch lever, and the protrusion comes into contact with the stopper when the manual trip device is manually operated, and is provided in a closing direction of the circuit breaker. It is assumed that the latch lever is arranged at a position that prevents the latch lever from rotating.

[0011] Further, a closing rod protruding by the coil excitation of the closing electromagnet, a latch lever pushed by the closing rod and rotating in a closing direction of the circuit breaker, and an opening / closing shaft rotating in conjunction with the latch lever, An opening / closing lever that opens and closes the circuit breaker in conjunction with the opening / closing axis; a claw that locks the latch lever to hold the circuit breaker in the closed state; and a trip rod that projects by the coil excitation of the trip electromagnet. An electromagnetic trip device which is pushed by the trip rod to rotate the pawl to release the engagement between the pawl and the latch lever; and a trip shaft driven in the axial direction by manual operation. A manual release device configured to rotate the pawl in conjunction with a release shaft to release the engagement between the pawl and the latch lever, wherein an operation piece is protruded from the release shaft; Manual tripping device limit switch having an actuator is provided at a position that is pressed on the operating piece when it is manually operated, it operates the limit switch when the actuator is pushed turned conductive
The magnet coil excitation shall be stopped.

Further, in addition to the above configuration, a stopper is provided on the tripping shaft, and a projection is provided on the latch lever, and the projection comes into contact with the stopper when the manual tripping device is manually operated. It is assumed that the latch lever is disposed at a position that prevents the latch lever from rotating in the closing direction of the circuit breaker.

[0013]

According to the structure of the present invention, the trip shaft is provided with the stopper and the latch lever is provided with the protrusion. The protrusion is disposed at a position where the protrusion comes into contact with the stopper when the manual tripping device is manually operated and prevents the latch lever from rotating in the closing direction of the circuit breaker. As a result, even if there is an electrical closing command during the manual tripping operation, the latch lever will never rotate since the latch lever will come into contact with the stopper. This mechanically interlocks the closing of the circuit breaker.

An operation piece is provided on the trip shaft, and a limit switch provided with an actuator is provided at a position pressed by the operation piece when the manual trip device is manually operated. When the actuator is pressed, the limit switch operates to stop exciting the coil of the closing electromagnet . Thus, even if electrical feed command in the manual tripping operation, the limit switch is turned on electromagnetic
Since the stone coil excitation is stopped, the electromagnetic trip device does not operate. As a result, the closing of the circuit breaker is electrically interlocked.

Further, as the manual tripping device, one of the above-mentioned mechanisms by the combination of the stopper of the tripping shaft and the projection of the latch lever, and the above-mentioned one by the combination of the operation piece of the tripping shaft and the limit switch. By providing another mechanism, the closing of the circuit breaker is interlocked both mechanically and electrically.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on embodiments.
FIGS. 1 to 4 are enlarged side views of a main part showing an operation mechanism of a circuit breaker according to an embodiment of the present invention. 1 is a closed state, FIG. 2 is an instantaneous state immediately after the manual trip operation, FIG. 3 is a state in which the latch lever 7 is tripped by the manual trip operation,
FIG. 4 shows the state after the manual trip operation is completed.

In FIG. 1, a threaded portion 21C is extended at the right end of the trip shaft 21, and a rectangular parallelepiped stopper 30 is provided at the tip thereof. The stopper 30 is slidable left and right along the lower surface of the support 9. further,
The counterbore 30 is provided with counterbored holes 30A and 30B from the left and right. The counterbored holes 30A and 30B communicate with each other through a through-hole 33.
Is penetrating. A nut 34 is screwed into the right end of the screw portion 21 and fitted into the counterbore 30A. The right end of the compression spring 32 is fitted in the counterbore hole 30B. The compression spring 32 includes a nut 31 and a stopper 3.
0 is interposed. On the other hand, the latch lever 7 is provided with a protrusion 7A. The protruding portion 7A also protrudes to the near side in the drawing, and when the stopper 30 slides to the left, the protruding portion 7A comes into contact with the stopper 30. The other configuration is the same as that of the conventional device, so that the same parts are denoted by the same reference numerals and detailed description thereof will be omitted.

In FIG. 1, when the push button 21A is pressed rightward, the pawl 14 rotates counterclockwise and the stopper 30 slides rightward. As a result, as shown in FIG. 2, the pawl 14 comes off the latch lever 7, the stopper 30 comes into contact with the projection 7A, and the compression spring 32 is compressed. Next, the latch lever 7 rotates counterclockwise, and its protruding portion 7A slides up above the stopper 30. At that moment, the stopper 30 is released as shown in FIG.
The compression spring 32 slides further to the right due to the return force. When the pressing of the hand push button 21A is released, FIG.
As shown in FIG.

In FIG. 3, it is assumed that an electric closing command is issued while the hand push button 21A is being pressed, and the latch lever 7 receives clockwise turning power. However, since the protruding portion 7A contacts the upper surface of the stopper 30, the latch lever 7 does not rotate and the circuit breaker is never closed. As shown in FIG. 4, the circuit breaker cannot be turned on again unless a person releases the push button 21A, and the manual tripping device is provided with a mechanical itter lock.

FIG. 5 is an enlarged side view showing a main part of an operation mechanism of a circuit breaker according to another embodiment of the present invention. An operation piece 35 is provided at an end of the trip shaft 21 and is fixed with a nut 23. Further, a limit switch 36 is disposed between a region where the trip shaft 21 moves left and right and a region where the latch lever 7 rotates, and is fixed to the lower surface of the support 9. FIG. 5 shows a state in which the latch lever 7 has been pulled out by manual operation. The operation piece 35 also protrudes toward the limit switch 36 (depth side in the drawing), and the actuator 37 of the limit switch 36 is pressed by the operation piece 35 when the hand push button 21A is pressed. Other configurations are the same as those of the conventional device of FIG.

In FIG. 5, when the actuator 37 of the limit switch 36 is pressed, the normally closed contact built in the limit switch 36 is opened. The normally closed contact of the limit switch 36 is connected in series to the exciting coil of the tripping electromagnet of the electromagnetic tripping device. With this configuration, even if an electric closing command is issued while the manual tripping device is operated, the electromagnetic tripping device never operates because the coil of the closing electromagnet is not excited. Therefore, the circuit breaker cannot be turned on again unless the person pushes the hand push button 21A, and the manual trip device is provided with an electric interlock.

FIG. 6 is an enlarged side view of a main part showing an operation mechanism of a circuit breaker according to still another embodiment of the present invention. A stopper 30 and a protrusion 7A having the same configuration as in FIG. 3 are provided, and an operation piece 35 and a limit switch 37 having the same configuration as in FIG. 5 are provided. FIG. 6 shows a state in which the latch lever 7 has been pulled out by manual operation. As described in FIGS. 3 and 5, respectively, both manual and electrical interlocks operate on the manual trip device. Since the lock is doubled, the manual tripping operation can be performed with confidence.

[0023]

As described above, in the present invention, the stopper is provided on the trip shaft and the protrusion is provided on the latch lever. The protrusion is located at a position where it comes into contact with the stopper when the manual trip device is manually operated, and prevents the latch lever from rotating in the closing direction of the circuit breaker. This provided a mechanical interlock in which the circuit breaker was never turned on during the manual tripping operation.

Further, an operation piece is projected from the trip shaft, and a limit switch provided with an actuator is provided at a position pressed by the operation piece when the manual trip device is manually operated. When the actuator is pressed, the limit switch operates to stop exciting the coil of the closing electromagnet . This provided an electrical interlock in which the circuit breaker was never turned on during the manual tripping operation.

Further, as the manual tripping device, the above mechanism by combining the stopper of the tripping shaft and the protrusion of the latch lever, and the other mechanism by combining the operation piece of the tripping shaft and the limit switch. And two mechanisms. This provided mechanical and electrical interlocks where the breaker was never turned on during manual operation. The interlock is duplicated, and the possibility of erroneous closing even if a closing command is issued during the manual operation is minimized, so that the manual tripping operation can be performed with ease.

[Brief description of the drawings]

FIG. 1 is an enlarged side view of a main part showing a closed state of an operation mechanism of a circuit breaker according to an embodiment of the present invention.

FIG. 2 is an enlarged side view of an essential part showing an instantaneous state immediately after a manual trip operation of the apparatus of FIG. 1;

FIG. 3 is an enlarged side view of a main part showing a state in which a latch lever has been released by a manual release operation of the apparatus of FIG. 1;

FIG. 4 is an enlarged side view of a main part showing a state after completion of a manual trip operation of the apparatus of FIG. 1;

FIG. 5 is an enlarged side view of a main part showing an operation mechanism of a circuit breaker according to another embodiment of the present invention.

FIG. 6 is an enlarged side view of a main part showing an operation mechanism of a circuit breaker according to still another embodiment of the present invention.

FIG. 7 is a side view showing an operation mechanism of the draw-out type circuit breaker.

FIG. 8 is a side view of a main part showing an instantaneous state of injection of the apparatus of FIG. 7;

FIG. 9 is a side view of a main part showing a state in which charging of the apparatus of FIG. 7 is completed.

FIG. 10 is an enlarged side view of a main part showing a closed state of a conventional circuit breaker operating mechanism.

11 is an enlarged side view of an essential part showing an instantaneous state immediately after the manual trip operation of the device of FIG. 10;

FIG. 12 is an enlarged side view of a main part showing a state in which a latch lever has been released by a manual release operation of the device of FIG. 10;

FIG. 13 is an enlarged side view of a main part showing a state after the manual trip operation of the device of FIG. 10 is completed.

[Explanation of symbols]

 6 Opening / closing axis 7 Latch lever 7A Projection 9 Support 14 Claw 27 Pin 20 Frame 18 Release lever 24 Lever 21 Release shaft 21A Hand push button 21B Screw 21C Screw 23 Nut 31 Nut 34 Nut 22 Compression spring 32 Compression spring 30 Stopper 30A Counterbored hole 30B Counterbored hole 33 Through hole 35 Operation piece 36 Limit switch 37 Actuator

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01H 33/42 H01H 33/66 H01H 33/46

Claims (3)

(57) [Claims] A closing rod which is protruded by a coil of a closing electromagnet when excited by a coil, a latch lever which is pushed by the closing rod and rotates in a closing direction of a circuit breaker, and an opening / closing shaft which rotates in conjunction with the latch lever. An opening / closing lever that opens and closes the circuit breaker in conjunction with the opening / closing axis, a claw that locks the latch lever to hold the circuit breaker in a closed state, and a trip rod that projects by the coil excitation of the trip electromagnet. An electromagnetic trip device that is pushed by the trip rod to rotate the claws and release the engagement between the claws and the latch lever, and a trip shaft driven in the axial direction by manual operation,
A manual release device configured to rotate the pawl by interlocking with the tripping shaft and release the engagement between the pawl and the latch lever, wherein a stopper is provided on the tripping shaft and the latch lever protrudes. A protrusion is provided at a position where the protrusion comes into contact with the stopper when the manual trip device is manually operated and prevents the latch lever from rotating in the closing direction of the circuit breaker. Circuit breaker operating mechanism. 2. A closing rod protruding by exciting a coil of a closing electromagnet, a latch lever pushed by the closing rod to rotate in a closing direction of the circuit breaker, and an opening / closing shaft rotating in conjunction with the latch lever. An opening / closing lever that opens and closes the circuit breaker in conjunction with the opening / closing axis; a claw that locks the latch lever to hold the circuit breaker in the closed state; and a trip rod that projects by the coil excitation of the trip electromagnet. An electromagnetic trip device that is pushed by the trip rod to rotate the claws and release the engagement between the claws and the latch lever, and a trip shaft driven in the axial direction by manual operation,
An operation piece is protruded from the trip shaft so that the operation piece protrudes and the manual operation is performed. A limit switch provided with an actuator is provided at a position pressed by the operation piece when the trip device is manually operated, and when the actuator is pressed, the limit switch operates to stop exciting the coil of the closing electromagnet . An operation mechanism for a circuit breaker, comprising: 3. The device according to claim 2, wherein a stopper is provided on the tripping shaft, and a projection is provided on the latch lever, and the projection is connected to the stopper when the manual tripping device is manually operated. An operation mechanism for a circuit breaker, wherein the operating mechanism is arranged at a position where the latch lever is prevented from rotating in the closing direction of the circuit breaker.