JP5290067B2 - Power circuit breaker - Google Patents

Description

  The present invention relates to a power circuit breaker suitable for a high-voltage power circuit breaker such as a substation or switching station, and more particularly to a power circuit breaker provided with an erroneous input prevention mechanism.

  The power circuit breakers installed in substations and switch stations release the energy stored in the breaker spring by an electrical signal or an artificial signal during the breaking operation, and pull the movable contact away from the stationary contact. In addition, the energy accumulated in the closing spring is released by an artificial signal and the movable contact is brought into contact with the fixed contact.

  And in the state where the movable contact is in contact with the fixed contact, that is, in the closing state, a power circuit breaker provided with an erroneous closing prevention mechanism is disclosed in Patent Document 1 and Patent Document 2 have already been proposed.

JP-A-9-259711 Japanese Patent Laid-Open No. 11-40015

  The power circuit breakers disclosed in Patent Documents 1 and 2 are provided with an erroneous charging prevention mechanism, so that wasteful release of energy accumulated in the closing spring due to erroneous charging operation and re-accumulation of released energy are performed. Since there is no need to perform work, a highly reliable power circuit breaker can be obtained.

  By the way, in general, a power circuit breaker constitutes a spring operation mechanism by operating a breaking spring operation portion, a closing spring operation portion, a closing operation mechanism, and a closing operation mechanism having a large number of links and cams. There is a risk that an assembly error of parts or a stroke error accompanying deformation of each part during long-term use may occur. In such a state, when an erroneous insertion prevention mechanism is installed between the cutoff spring operation unit and the insertion operation mechanism, it is not guaranteed that the erroneous insertion prevention mechanism functions normally.

  Therefore, it is necessary to correct the stroke error by correcting the length of the erroneous insertion prevention mechanism or correcting the curvature of the cam.

  However, in the power circuit breakers disclosed in Patent Documents 1 and 2, since the erroneous insertion prevention mechanism is installed inside the operation mechanism portion, when correcting the stroke error, the operation mechanism portion is disassembled and erroneously inserted. The prevention mechanism had to be corrected, and the mechanism required a great deal of labor and time to be corrected.

  The objective of this invention is providing the circuit breaker for electric power provided with the erroneous injection | throwing-in prevention mechanism which can correct a stroke error easily.

  In order to achieve the above object, according to the present invention, a length adjusting mechanism is provided on a connecting member that connects between the shut-off spring operating portion of the erroneous input preventing mechanism and the input operating mechanism.

  Further, according to the present invention, the length adjustment mechanism is provided in the connecting member that connects between the shut-off spring operation portion of the erroneous charging prevention mechanism and the closing operation mechanism, and the connecting member is installed on the outermost side of the support housing. is there.

  As described above, by providing the length adjustment mechanism on the connecting member that connects the shut-off spring operation portion of the erroneous insertion prevention mechanism and the insertion operation mechanism, the operator can easily operate only the length adjustment mechanism. The stroke error can be corrected, and the erroneous insertion prevention mechanism can be normally functioned.

  Further, by installing the connecting member on the outermost side of the support housing, the correction work can be easily performed without taking much labor and time.

  As described above, according to the present invention, it is possible to obtain a power circuit breaker equipped with an erroneous charging prevention mechanism that can easily correct a stroke error.

1 is a longitudinal side view showing a power gas circuit breaker which is an embodiment of a power circuit breaker according to the present invention. The enlarged side view which shows the operation mechanism part of the gas circuit breaker for electric power of FIG. The side view which shows the interruption | blocking state of the operation mechanism part of FIG. FIG. 4 is a side view showing a loading process from the shut-off state of the operation mechanism unit of FIG. 3. The side view which shows immediately after injection | throwing-in operation | movement from the interruption | blocking state of the operation mechanism part of FIG. The A direction enlarged view of FIG. FIG. 3 is an enlarged side view of a main part for explaining an operation when an erroneous insertion command is generated in the input state of the input operation mechanism of FIG. 2. FIG. 4 is an enlarged front view showing the configuration of the erroneous insertion prevention mechanism of FIG. 3.

  Hereinafter, an embodiment of a power circuit breaker according to the present invention will be described based on the power gas circuit breaker shown in FIGS.

  The power gas circuit breaker 1 includes a cutoff mechanism unit 2, an operation mechanism unit 3, and a power transmission mechanism unit 4 that transmits the power of the operation mechanism unit 3 to the cutoff mechanism unit 2.

  The shut-off mechanism unit 2 includes a cylindrical grounding container 5 and a gantry 6 that supports the grounding container 5 on a foundation. In the cylindrical grounding container 5, for example, insulation of sulfur hexafluoride gas or the like is provided. Gas is sealed at a specified pressure. In addition, bushings 7 and 8 penetrate obliquely upward from the axial middle portion of the grounding container 5 to the outside of the container. Inside the bushings 7 and 8, electric wires in a substation and a switching station are connected to connect the electric circuit. The constituent conductor is accommodated. Further, in the ground container 5, a stationary contact 9 and a movable contact 10 that contacts and dissociates from the stationary contact 9 are supported via an insulating material.

  The movable contact 10 is connected to one end of the insulating rod 11 at the opposite end to the fixed contact 9. The other end of the insulating rod 11 is connected to a link 13 fixed to the rotary shaft 12 supported by the ground container 5. Another link 14 is fixed to the rotating shaft 12, and one end of a connecting rod 15 is connected to the link 14. With such a configuration, the power transmission mechanism unit 4 is configured.

  On the other hand, the operation mechanism unit 3 is installed in an operation box 16 supported by the gantry 6, and in the operation box 16, a support housing that supports each component and a housing 17 that is also a fixing member. A main shaft 19 of the spring operation mechanism 18 is installed. A link 20 connecting the other end of the connecting rod 15 of the power transmission mechanism 4 is fixed to the main shaft 19. The main shaft 19, the connecting rod 15, the links 20 and 14, and the rotating shaft 12 form a four-bar linkage mechanism. The spring operation mechanism 18 and the movable contact 10 are connected by this four-bar linkage mechanism.

  Next, the spring operation mechanism 18 housed in the operation box 16 shown in FIG. 1 will be described based on the schematic diagrams of FIGS.

  FIG. 2 shows a state in which the power gas circuit breaker 1 in which the closing spring 21 and the breaking spring 22 of the spring operating mechanism 18 are compressed is inserted, and FIG. 3 shows the closing spring of the spring operating mechanism 18. 21 shows a cut-off state in which the cut-off spring 22 is released and the cut-off spring 22 is released. As the operation changes from FIG. 4 to FIG. 5, the moving operation of the movable contact 10 proceeds in order, FIG. 4 is a diagram showing the process of the charging operation, and FIG. 5 is a diagram immediately after the closing operation is completed. . In FIG. 5, the closing spring 21 is in a released state. After the state shown in FIG. 5, the closing spring 21 is compressed and returned to the state shown in FIG. 2 by driving the electric motor or the like. Details of the above operation will be described later.

  2 and 3 show the sections of the spring operating mechanism 18. The spring operating mechanism 18 includes a shut-off spring operating portion 23, a closing spring operating portion 24, a shut-off operating mechanism 25, a closing operation mechanism 26, an erroneous closing preventing mechanism 27, and a closing spring storage by a drive source such as an electric motor (not shown). Power device.

  The closing spring operating portion 24 has a cam 29 attached to a rotary shaft 28 rotatably supported by the casing 17 in the operation box 16, and one end of a closing spring link 30 is connected to the intermediate portion of the cam 29 via the shaft 31. It can be rotated freely. A spring receiver 32 is attached to the other end of the closing spring link 30 and holds one end side of the closing spring 21. The closing spring 21 is disposed on the outer periphery of the closing spring link 30, and the opposite side of the spring receiver 32 is held by the housing 17.

  The making control mechanism 26 has a making lever 34 that can be engaged with a roller 33 attached to a cam 29, and this making lever 34 is rotatably attached to the housing 17 at one end by a rotating shaft 35. A roller 36 is pivotally supported at the end. The closing lever 34 is constantly pressed in the clockwise direction by the compression spring S1. An engaging portion 34K that engages with the roller 33 on the cam 29 side is formed in the intermediate portion of the closing lever 34. In addition, an L-shaped throwing trigger 37 whose one end is in contact with the roller 36 of the throwing lever 34 is rotatably attached to a rotating shaft 38 supported by the casing 17. The closing trigger 37 is constantly pressed in the clockwise direction by the compression spring S2. A closing trigger portion 37 </ b> K is formed extending in the horizontal direction from the rotation shaft 38 of the closing trigger 37 to the opposite side to the roller 36, and the tip of the plunger 40 of the closing solenoid 39 is capable of contacting the closing trigger 37. Are arranged opposite to each other.

  The arrangement of the making operation mechanism 26 viewed from the direction of the arrow in FIG. 2 will be described with reference to FIG. The closing solenoid 39 has a first closing solenoid 39 </ b> A and a second closing solenoid 39 </ b> B arranged in parallel along the axial direction of the rotary shaft 38 so as to make a closing operation reliably. The making trigger 37 is provided with a making trigger portion 37K that can contact the plungers 40A and 40B of the making solenoids 39A and 39B. In this embodiment, the plungers 40A and 40B of the closing solenoids 39A and 39B have different lengths. However, the lengths are not particularly limited, and can be freely changed in consideration of the design and operating conditions of the device. May be.

  Next, the center part of the Y-shaped main lever 41 is fixed to the main shaft 19 and the rollers 42 and 43 are pivotally supported at two separate ends of the main lever 41 in the cutoff spring operation unit 23. ing. Further, one end of a cutoff spring link 44 is rotatably attached to the remaining end portion of the main lever 41 via a shaft 45S. A spring receiver 45 is attached to the other end of the cutoff spring link 44 and holds the cutoff spring 22 disposed on the outer periphery of the cutoff spring link 44. The blocking spring 22 is held by the casing 17 on the side opposite to the end held by the spring receiver 45.

  The shut-off operation mechanism 25 has a shut-off lever 47 attached to a shaft 46 fixed to the housing 17 so that one end thereof can freely rotate. The shut-off lever 47 is constantly receiving a compressive force in the clockwise direction by the compression spring S3. An engaging portion 47K that engages with the roller 43 of the main lever 41 is formed in the vicinity of the other end side of the blocking lever 47, and a roller 48 is pivotally supported on the tip side thereof. A V-shaped trigger lever 49 is rotatably supported on the housing 17 via a shaft 49S so as to be engageable with the roller 48 of the blocking lever 47. The trigger lever 49 is constantly pressed in the clockwise direction by the compression spring S4. An engagement portion 49K that engages with the roller 48 is formed on one end side of the V-shape of the trigger lever 49, and the roller 50 is pivotally supported on the opposite end portion. One end of an L-shaped blocking trigger 51 is opposed to the roller 50 so as to be engageable. The cutoff trigger 51 is constantly pressed in the clockwise direction by the compression spring S5. A corner portion of the L-shaped blocking trigger 51 is supported by the housing 17 via the shaft 52, and the side that contacts the roller 50 faces the plunger 54 of the tripping solenoid 53 supported by the housing 17. Has been placed.

  In the present embodiment, the blocking operation mechanism 25 is a two-stage mechanism including a blocking trigger 51 and a trigger lever 49. For example, the trigger lever 49 is omitted and one end of the blocking trigger 51 is connected to the roller 48 of the blocking lever 47. The blocking trigger 51 and the trigger lever 49 may have a three-stage configuration.

  Next, the erroneous insertion prevention mechanism 27, which is a feature of the present invention, has a connecting lever 55 that is a connecting member, and one end of the connecting lever 55 rotates between the main shaft 19 of the main lever 41 and the intermediate portion of the roller 43 via a pin 55P. It is connected freely. The other end of the connecting lever 55 is rotatably connected to one end of a V-shaped malfunction prevention lever 56 via a pin 57. A corner of the malfunction prevention lever 56 is rotatably attached to a shaft 58 supported by the housing 17, and a roller 59 is pivotally supported on the other end of the malfunction prevention lever 56. The trigger 37 is disposed opposite the trigger 37K. Further, in the closing state in which the shut-off spring 22 is compressed, the closing plunger 40, the roller 59, and the rotating shaft 58 are arranged so as to be aligned with the protruding direction of the closing plunger 40.

  In addition, the erroneous insertion prevention mechanism 27 has a connecting lever 55 positioned on the outermost side of each component supported with respect to the casing 17 in the operation box 16, as shown in FIG. The connecting lever 55 is supported so as to be positioned on the outermost side of the housing 17. Further, the connecting lever 55 is formed with a length adjusting mechanism that connects, for example, a turnbuckle 60 to an intermediate portion thereof so that the length of the connecting lever 55 is expanded and contracted.

  The operation of the power gas circuit breaker 1 configured as described above will be described below.

  Usually, an electric power is supplied from a power system (not shown) from the bushing 7, and an open circuit is configured to return from the bushing 8 to the power system again via the fixed contact 9 and the movable contact 10.

  When an accident occurs in the power system due to a lightning strike or the like, the spring operation mechanism 18 in the operation box 16 is driven to rotate the main shaft 19 and the link 20 counterclockwise and move the connecting rod 15 downward. By the movement of the connecting rod 15, the link 14, the rotating shaft 12, and the link 13 rotate counterclockwise, and the insulating rod 11 is moved to the left. As a result, the movable contact 10 is separated from the fixed contact 9 to open the switching contact, and the supply of power from the bushing 7 to the bushing 8 is interrupted.

  In addition, after the shut-off, by driving the spring operating mechanism 18 of the operation box 16, the main shaft 19 and the link 20 are rotated clockwise to move the connecting rod 15 upward, contrary to the shut-off operation. When the connecting rod 15 moves, the link 14, the rotating shaft 12, and the link 13 rotate clockwise to move the insulating rod 11 to the right. Thereby, the movable contact 10 comes into contact with the fixed contact 9 to close the open / close contact, and the supply of power from the bushing 7 to the bushing 8 is resumed.

Various operations of the spring operation mechanism 18 for performing the opening / closing operation of the power gas circuit breaker 1 will be described below.
[When shut off]
First, an operation for shifting from the input state shown in FIG. 2 to the cutoff state will be described. When a shut-off command is input in the closing state, the spring operation mechanism 18 starts a shut-off operation. That is, the tripping solenoid 53 of the blocking operation mechanism 25 is excited, and the plunger 54 protrudes to press the blocking trigger 51. As a result, the engagement between the cutoff trigger 51 and the trigger lever 49 is released.

When the engagement with the blocking trigger 51 is released and the trigger lever 49 is rotatable, the trigger lever 49 is pressed by the roller 48 of the blocking lever 47 and thus rotates counterclockwise around the shaft 49S. The blocking lever 47 whose rotation is restricted becomes freely rotatable, and the blocking lever 47 rotates around the shaft 46 counterclockwise by the pressing force of the roller 43 of the main lever 41. The engagement between the roller 43 of the main lever 41 and the blocking lever 47 is released, and the main lever 41 is freely rotatable. Then, since the restriction of the cutoff spring 22 in the compressed state is released, the cutoff spring 22 is released, and the main lever 41 rotates counterclockwise. As a result, the main shaft 19 rotates and the above-described blocking operation is performed. When the shut-off spring 22 is fully released, the shut-off operation ends. At the same time, the roller 42 at the end of the main lever 41 stops substantially in contact with the outer peripheral surface of the cam 29 as shown in FIG.
〔When turned on〕
Next, the operation of shifting from the shut-off state in FIG. 3 where the stationary contact 9 and the movable contact 10 are separated to the closing state in FIG. 5 will be described.

  In the shut-off state shown in FIG. 3, when a closing command is input to the spring operating mechanism 18 and the closing solenoid 39 is excited, the plunger 40 protrudes downward and presses the closing trigger portion 37K of the closing trigger 37. By this pressing, the making trigger 37 rotates counterclockwise, and the engagement between the roller 36 of the making lever 34 and the making trigger 37 is released. Then, the closing lever 34 whose rotation is restricted becomes free to rotate, and the pressing lever 34 rotates counterclockwise by the pressing force from the roller 33 of the cam 29, and the roller 33 of the closing lever 34 and the cam 29. Is disengaged. As a result, since the restriction of the rotation of the cam 29 is eliminated, the spring force of the closing spring 21 is released, the closing spring link 30 moves to the right, and the rotating shaft 28 and the cam 29 are rotated counterclockwise.

  As the cam 29 rotates counterclockwise, the outer peripheral surface of the cam 29 comes into contact with the roller 42 of the main lever 41 to rotate the main lever 41 clockwise. When the cam 29 rotates approximately half counterclockwise, the outer peripheral surface of the maximum curvature radius portion of the cam 29 contacts the roller 42 of the main lever 41. At this time, the cutoff spring link 44 connected to the main lever 41 compresses the cutoff spring 22 to almost the original position (FIG. 4).

  Due to the clockwise rotation of the main lever 41, the connecting rod 15 is moved upward, whereby the above-described closing operation is performed.

  At the end of the closing operation in which the closing spring 21 is fully released, as shown in FIG. To return to the original position. Thereby, the cutoff spring 22 is stored.

  After the closing operation is finished, the released closing spring 21 rotates the rotating shaft 28 counterclockwise from the state shown in FIG. 5 via a closing spring accumulating device including an electric motor and gears (not shown). Then, the closing spring 21 is compressed and stored. When the cam 29 has passed almost a half rotation due to the rotation of the rotary shaft 28, the closing spring energy storage device is stopped by a command from a limit switch (not shown).

  The cam 29 tries to further rotate counterclockwise by the spring force of the compressed closing spring 21. At this time, the roller 33 of the cam 29 is already engaged with the engaging portion 34K of the closing lever 34, and Since the roller 36 of the closing lever 34 is engaged with the closing trigger 37, the rotation of the cam 29 is prevented and the spring force of the closing spring 21 is maintained. As a result, the closing holding state shown in FIG. 2 is obtained, and the shut-off spring 22 and the closing spring 21 are both compressed and returned to the initial state.

  Next, the operation of the erroneous insertion prevention mechanism 27, which is a feature of the present invention, will be described with reference to FIG. 2, FIG. 3, FIG. 6, FIG.

  As shown in FIG. 2, the roller 59 of the malfunction prevention lever 56 is in contact with the closing trigger portion 37 </ b> K of the closing trigger 37 in the closing state in which the cutoff spring 22 is compressed. As shown in FIG. 7, in the closing state, when a closing command based on an erroneous electrical signal is input, the parallel closing solenoids 39 (39A, 39B) are excited and the plunger 40 (40A, 40B) is moved downward. Projecting and presses the closing trigger portion 37K. The counterclockwise rotation of the making trigger 37 due to the pushing of the plunger 40 of the making solenoid 39 is suppressed by the contact of the malfunction preventing lever 56 with the roller 59, and the engagement of the one end of the making trigger 37 and the roller 36 of the making lever 34. Stays together. Accordingly, since the levers and rollers of the closing operation mechanism 26 remain engaged, the spring force of the closing spring 30 is not released and the cam 29 can be prevented from being idle.

  Further, as shown in FIG. 7, the rotation shaft 58 and the roller 59 of the malfunction prevention lever 56 are arranged in a straight line with respect to the protruding direction of the plunger 40 of the closing solenoid 39. The pressing force against the malfunction prevention lever 56 due to the protrusion of the plunger 40 acts on the rotating shaft 58 and the roller 59 on the same line as indicated by an arrow, so that a force such as bending does not occur. Therefore, the malfunction prevention lever 56 can exhibit a sufficient function as the malfunction prevention mechanism 26 even in a small shape.

  Furthermore, as shown in FIG. 6, the counterclockwise rotation of the closing trigger 37 causes the malfunction prevention lever 56 to rotate regardless of which plunger 40A, 40B protrudes by the closing command with respect to the two closing solenoids 39A, 39B. Since it is restrained by the roller 59, an erroneous feeding operation can be prevented.

  Further, as shown in FIG. 3, in the shut-off state in which the shut-off spring 22 is released, the roller 59 of the malfunction prevention lever 56 is separated from the place where the counter-clockwise rotation of the throw trigger 37 is suppressed. When a command is input, the input operation starts.

  In addition, the erroneous insertion prevention mechanism 27 according to the present embodiment includes the turnbuckle 60 that adjusts the length of the connecting lever 55, so that the assembly of the spring operating mechanism 18 having a large number of links and cams can be performed. If an error or a stroke error due to deformation of each part occurs during long-term use, the erroneous insertion prevention mechanism 27 may not operate normally. In such a case, it is necessary to disassemble the erroneous insertion prevention mechanism 27 to correct the parts or replace the parts, and much labor and time are spent on the work.

  However, in the present embodiment, when an assembly error or a stroke error due to deformation of each part occurs during long-term use, the length of the connecting lever 55 can be adjusted by the turnbuckle 60. It is not necessary to disassemble and correct the parts or replace the parts, and the stroke error correction work can be easily performed.

  In addition, in the present embodiment, since the connecting lever 55 having the turnbuckle 60 is positioned on the outermost side of the casing 17, the operation of correcting the stroke error can be performed by removing the operation box 16 or by covering the operation box 16. The work site can be viewed directly by opening the. As a result, it is possible for the operator to easily correct the stroke error with an easy posture and to perform an accurate operation.

  By the way, in the said embodiment, although the ground container 5 is arrange | positioned in the horizontal direction, you may arrange | position in the vertical direction. Moreover, although the said embodiment demonstrated using the gas breaker 1 for electric power which penetrated the grounding container 5 and attached bushings 7 and 8 directly, the bushings 7 and 8 do not penetrate the grounding container 5 outside. It may be a power gas circuit breaker having a configuration. Furthermore, although the power gas circuit breaker filled with sulfur hexafluoride gas has been described as an example, it goes without saying that the present invention can also be applied to other power circuit breakers such as a vacuum circuit breaker.

  DESCRIPTION OF SYMBOLS 1 ... Electric power circuit breaker, 2 ... Shut-off mechanism part, 3 ... Operation mechanism part, 4 ... Power transmission mechanism part, 17 ... Housing | casing, 18 ... Spring operation mechanism, 21 ... Closing spring, 22 ... Shut-off spring, 23 ... A shut-off spring operation part, 24 ... a closing spring operation part, 25 ... a shut-off operation mechanism, 26 ... a closing operation mechanism, 27 ... an erroneous closing prevention mechanism, 55 ... a connecting lever, 60 ... a turnbuckle.

Claims (3)

A power transmission mechanism that drives the movable contact constituting the switching contact and the fixed contact in a direction to make contact and separation, and a cutoff that applies power in a direction that pulls the movable contact away from the fixed contact through this power transmission mechanism A shut-off spring operating portion having a spring; a shut-off operating mechanism for holding the stored state of the shut-off spring and releasing the stored-spring energy by a shut-off command; and the movable contactor via the power transmission mechanism. A closing spring operating portion having a stored closing spring for applying a driving force in a direction approaching the fixed contact, and holding the stored state of the closing spring and releasing the storage of the closing spring by a closing command A closing operation mechanism that simultaneously stores the shut-off spring and a connecting member that connects the closing operation mechanism and the shut-off spring operating portion to prevent erroneous operation of the closing operation mechanism A structure, a closing spring prestressing device for prestressing the opened closing spring of the closing spring operating unit, the housing and the power breaker having a supporting these,
A power circuit breaker characterized in that a length adjusting mechanism for adjusting the length of the connecting member is provided in the connecting member of the erroneous charging prevention mechanism. A power transmission mechanism that drives the movable contact constituting the switching contact and the fixed contact in a direction to make contact and separation, and a cutoff that applies power in a direction that pulls the movable contact away from the fixed contact through this power transmission mechanism A shut-off spring operating portion having a spring; a shut-off operating mechanism for holding the stored state of the shut-off spring and releasing the stored-spring energy by a shut-off command; and the movable contactor via the power transmission mechanism. A closing spring operating portion having a stored closing spring for applying a driving force in a direction approaching the fixed contact, and holding the stored state of the closing spring and releasing the storage of the closing spring by a closing command A closing operation mechanism that simultaneously stores the shut-off spring and a connecting member that connects the closing operation mechanism and the shut-off spring operating portion to prevent erroneous operation of the closing operation mechanism A structure, a closing spring prestressing device for prestressing the opened closing spring of the closing spring operating unit, the housing and the power breaker having a supporting these,
A power circuit breaker characterized in that a length adjusting mechanism for adjusting the length of the connecting member is provided on the connecting member of the erroneous insertion preventing mechanism, and the connecting member is positioned on the outermost side of the casing.   The power breaker according to claim 1 or 2, wherein the length adjusting mechanism is a turnbuckle.

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