JP2019046756A - Gas circuit breaker - Google Patents

Abstract

To provide a gas circuit breaker that achieves both facilitation of operation of attaching and detaching a bidirectional drive mechanism and a driven side electrode to a blocking portion and reduction of the weight of a rod connecting a drive side electrode and the bidirectional drive mechanism.SOLUTION: A gas circuit breaker includes a bidirectional drive mechanism 10 including a drive side connecting rod 11 in which a drive side electrode and a driven side electrode are provided opposite to each other in a sealed tank, the drive side electrode has a drive side main electrode and a drive side arc electrode, and the driven side electrode has a driven side main electrode and a driven side arc electrode 5, the drive side arc electrode is connected to a controller, and the driving force from the drive side electrode is received and a driven side connecting rod 13 connected to the driven side arc electrode 5 with respect to the operation of the drive side connecting rod 11, and a first grooved cam 16 of the drive side connecting rod 11 is penetrated to the end opposite to the drive side electrode of the drive side connecting rod 11.SELECTED DRAWING: Figure 3

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to a gas circuit breaker, and more particularly to a gas circuit breaker to which a bi-directional drive mechanism for driving electrodes in opposite directions is applied.

  Gas breakers used for high voltage power systems generally use a puffer type that shuts off the current by blowing a compressed gas onto the arc generated between the electrodes using arc extinguishing gas pressure rise during the opening operation. Used in

  In order to improve the interrupting performance of the puffer type gas circuit breaker, a bidirectional drive system has been proposed in which the driven side electrode, which has been fixed in the prior art, is driven in the direction opposite to the drive direction of the drive side electrode.

  For example, in Patent Document 1, a fork type lever, a rod for driving a driven side electrode, and three pins for defining an operation of a rod and a lever are accommodated in a guide. The guide is fastened to the outside of the driven electrode. According to the present invention, the pin interlocked with the movement of the drive-side rod is brought into contact with the recess of the fork housed in the guide, whereby the fork-type lever is rotated and converted to the swinging motion in the opening / closing direction. The driven side arc electrode is driven in the direction opposite to the operation direction of the driving side electrode. When the pin is separated from the recess of the fork, the lever is held in position, and the driven arc electrode is at rest.

U.S. Pat. No. 6,271,494

  In the gas circuit breaker using the bidirectional drive mechanism described in Patent Document 1, all movable parts are housed in the guide. Therefore, in order to inspect the bidirectional drive mechanism and the driven side arc electrode by removing it from the blocking portion, it is necessary to loosen the bolt arranged in the direction orthogonal to the tank axial direction in which the guide is fastened. Generally, disassembly and assembly of the blocking section are performed by removing the flange provided at the end of the tank shaft, but it may take time to loosen or tighten the bolt at the guide fastening point away from the flange surface . In addition, since the rod connecting the drive side electrode and the bidirectional drive mechanism has a uniform cross-sectional dimension except for the connection portion with the nozzle, there is a possibility that sufficient weight reduction can not be achieved. The

  In view of the above, the present invention facilitates the work of attaching and detaching the bidirectional drive mechanism and the driven side arc electrode to the blocking portion, and reduces the weight of the rod connecting the drive side electrode and the bidirectional drive mechanism. With the goal.

  The above object is to provide a drive side electrode which has a drive side main electrode (2) and a drive side arc electrode (4), is connected to the controller (1), and is provided in the sealed tank (100) A driven side electrode which has a main electrode (3) and a driven side arc electrode (5) and is provided in the sealing tank (100) so as to face the drive side electrode, a bidirectional drive mechanism (10) And the bi-directional drive mechanism (10) includes a drive-side connecting rod (11) for receiving a driving force from the drive-side electrode, and a driven-side connection connected to the driven side arc electrode (5). A rod (13), a guide (14) for holding the drive side connection rod (11) and the driven side connection rod (13) so that the inside can be translated freely, and a lever fixing pin (15) Freely fixed, the driven connection rod (13) and the drive side train A lever (12) for connecting the rods (11) and for operating the driven connection rod (13) in the opposite direction to the movement of the drive connection rod (11); Achieved by means of a gas circuit breaker characterized in that the first grooved cam (16) of the connection rod (11) penetrates to the end (11b) opposite to the drive side electrode of the drive side connection rod (11) Be done.

  According to the present invention, it is possible to provide a gas circuit breaker capable of achieving both the easy removal of the bidirectional drive mechanism and the driven side arc electrode and the reduction in weight of the drive side connecting rod.

It is a perspective view of the interruption | blocking part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the closed state of a circuit breaker. It is a front view of the interruption | blocking part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the closed state of a circuit breaker. It is the figure which expanded the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the closed state of a circuit breaker. It is the figure which expanded the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the open state of a circuit breaker. It is the figure which expanded the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the state which removed the auxiliary | assistant block in the closing state of a circuit breaker. It is a figure which shows the state in which the to-be-driven side arc electrode complete | finished operation in closing operation. It is the figure which expanded the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the state which removed the bolt of the bidirectional | two-way drive mechanism attachment base in the open state of a circuit breaker. It is the figure which expanded the bidirectional | two-way drive mechanism part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the state in the middle of removing a bidirectional | two-way drive mechanism in the open state of a circuit breaker. It is a front view of the interruption | blocking part of the gas circuit breaker which concerns on Example 1, and is a figure which shows the state from which the bidirectional | two-way drive mechanism was removed in the open state of a circuit breaker.

  Hereinafter, a gas circuit breaker according to an embodiment of the present invention will be described with reference to the drawings. The following is merely an example of the embodiment and is not intended to limit the contents of the invention to the specific embodiments described below. The invention itself can be implemented in various aspects in accordance with the contents described in the claims. Although the following embodiments are described by taking an example of a circuit breaker having a mechanical compression chamber and a thermal expansion chamber, it is also possible to apply the present invention to, for example, a circuit breaker having only a mechanical compression chamber.

  1 to 2 show the closed state of the shutoff portion of the gas circuit breaker according to the first embodiment. FIG. 1 is a perspective view cut at the center of the sealed tank 100, and FIG. 2 shows a front view seen from the direction of arrow A in FIG.

  In the sealed tank 100, a gas such as sulfur hexafluoride is sealed at a predetermined pressure. Further, the drive side electrode and the driven side electrode are provided coaxially to face each other. The drive side electrode has a drive side main electrode 2 and a drive side arc electrode 4, and the driven electrode has a driven side main electrode 3 and a driven side arc electrode 5. The drive side main electrode 2 is connected to the cylinder 31. The cylinder 31 slides inside the drive side conductor 26. The driven side main electrode 3 is connected to the driven side conductor 25. The drive conductor 26 and the driven conductor 25 are fixed in the sealing tank 100. However, illustration of the fixed part is omitted.

  Adjacent to the sealed tank 100, the controller 1 is provided. The manipulator 1 and the shaft 6 in the sealed tank 100 are connected to the insulating rod 24 by a link mechanism (not shown). The cylinder 31 and the drive side arc electrode 4 are connected to the side opposite to the manipulator of the shaft 6. The shaft 6 and the drive side arc electrode 4 are provided to penetrate through the mechanical compression chamber 7 and the thermal expansion chamber 9.

  A driven side arc electrode 5 is provided coaxially to face the driving side arc electrode 4. The nozzle 8 is provided inside the cylinder 31. One end of the driven side arc electrode 5 and the tip of the nozzle 8 are connected to the bi-directional drive mechanism 10.

  As shown in FIG. 1 to FIG. 2, in the closed state of the gas circuit breaker, the operating device 1 is set at a position where the drive side main electrode 2 and the driven side main electrode 3 are conducted. Configure the circuit.

  When interrupting the short circuit current due to lightning strike or the like, the controller 1 is driven in the opening direction (the negative side in the Y direction), and the drive side main electrode 2, the driven side main electrode 3 and the drive side via the shaft 6 The arc electrode 4 and the driven side arc electrode 5 are separated. At this time, an arc is generated between the arc electrodes. In the gas circuit breaker described in the present embodiment, an arc-extinguishing gas whose pressure is increased by utilizing mechanical arc-extinguishing gas blowing by the mechanical compression chamber 7 at the time of opening operation and arc heat by the thermal expansion chamber 9. The current is cut off by extinguishing the arc by blowing the

  In order to reduce the operation energy of the gas circuit breaker, the driven side arc electrode 5 fixed in the prior art is driven in the opposite direction (the positive side in the Y direction) to the opening direction (the negative side in the Y direction) of the drive side electrode A bidirectional drive mechanism 10 is provided. The bidirectional drive system in the first embodiment will be described below based on FIGS. 1 to 8.

  FIG. 3 is a front view of the bidirectional drive mechanism of the gas circuit breaker according to the first embodiment. The bidirectional drive mechanism 10 of the present embodiment is connected by a lever 12 rotatably provided on the guide 14 while the driven connection rod 13 and the drive connection rod 11 are translatably held by the guide 14. Configured

  A first grooved cam 16 is cut into the drive side connecting rod 11, and is constituted by a first linear portion 16A, an inclined portion 16B, and a second linear portion 16C, as viewed from the operation device 1 side. The first straight portion 16A and the second straight portion 16C are provided substantially in parallel with the drive direction of the drive side connecting rod 11, and a hatched portion 16B is provided therebetween. The shape of the inclined portion 16B can be arbitrarily designed in accordance with the operation characteristic of the blocking portion, and for example, it can be considered to be a curve or a straight line.

  In the present embodiment, the second linear portion 16C of the cam groove 16 is provided up to the end 11b opposite to the drive side electrode of the drive side connecting rod 11. A rectangular parallelepiped auxiliary block 30 is fastened to the drive side connecting rod end portion 11 b by a bolt 29 a in a direction orthogonal to the operation axis direction of the drive side connecting rod 11.

  In the closed state of the circuit breaker shown in FIG. 3, the drive side connection rod 11 projects from the guide 14 in a cantilever shape on the positive side in the Y direction, but the drive side connection rod end 11 b is closed by the auxiliary block 30. Because of the cross section, the gap of the second straight portion 16 of the drive side connecting rod 11 is not deformed in the narrowing direction. Thus, the drive-side connecting rod 11 can be reduced in weight while maintaining proper bending rigidity in the vertical direction.

  An open circuit command is input to the circuit breaker from the state shown in FIG. The state of the bidirectional drive mechanism at this time is shown in FIG. The bolt 29 is shorter than the height h11 of the drive side connecting rod 11. In the open state of the circuit breaker, the drive side connecting rod 11 enters the guide 14, but the interference between the bolt 29 and the guide 14 is avoided.

  The operation of the driven connection rod 13 at the time of transition from the closed state to the open state will be described. A second grooved cam 17 constituted by a curve is cut into the guide 14. The shape of the second groove cam 17 is not limited to a curve, and can be appropriately changed to a straight line or the like according to the cutoff operation characteristic. As shown in FIG. 3, the first grooved cam 16 and the second grooved cam 17 form a laminated structure in the X-axis direction, and the drive-side movable pin 18 is communicated with the overlapping portion of the two grooved cams. Furthermore, the drive-side movable pin 18 is also passed through the third groove cam 19 cut into the lever 12. The lever 12 swings with the fixing pin 15 as a rotation axis. From the closed state shown in FIG. 3, the drive side connecting rod 11 is moved to the Y direction negative side by the open operation. While the drive-side movable pin 18 is in contact with the first linear portion 16A of the first grooved cam 16, it is stationary. Further, when the drive side connecting rod 11 moves to the Y direction negative side, the drive side movable pin 18 abuts on the inclined portion 16B of the first groove cam 16, and the force from the drive side movable pin 18 to one side of the inner wall of the third groove cam 19 Works, and the lever 12 swings counterclockwise. The groove shape of the third groove cam 19 is not limited to the elliptical shape shown in FIG. 8 and can be appropriately changed in accordance with the shutoff operation characteristic.

  The driven side drive pin 20 is rotatably supported at one end of the lever 12. Further, the grooved cam 21 is cut into the driven connection rod 13, and the driven drive pin 20 is in communication. When the lever 12 is operated in the opening direction, the driving force from the operation device 1 acts on the drive side connecting rod 11, and the driving force acts on the drive pin 18 from the groove cam 16B. Since a force is transmitted from drive pin 20 to the Y direction positive side of groove cam 21, integrated drive side connecting rod 13 and driven side arc electrode 5 are on the Y side positive side, ie, drive side arc electrode 4. Are driven in the opposite direction.

  Next, disassembling of the circuit breaker at the time of inspection or part replacement will be described. For example, as shown in FIG. 3, the coupling between the bidirectional drive mechanism 10 and the drive side electrode is provided with a fastening ring 22 attached to the nozzle 8, and the fastening ring 22 is provided with a hole through which the tip of the drive side connecting rod 11a passes. The drive side fastening screw is tightened with a nut 23. The drive-side connection rod 11 and the fastening ring 22 may be connected by providing a fastening female screw on the drive-side connection rod 11 and fastening the bolt from the outside of the fastening ring.

  The procedure for removing the dual drive mechanism and the driven side arc electrode 4 from the blocking portion will be described with reference to FIGS. 1 to 8. The gas is removed from the sealed container 100, and the flange at the end of the sealed container is removed. Further, manual operation means (not shown) is added to the operation device 1 so that the moving speed of the drive side connecting rod 11 can be made sufficiently slow compared to the normal current interruption.

  In FIG. 1, a bolt tightening tool (not shown) is inserted from the end 100b of the sealed container 100, and the bolt 29 is removed as shown in FIG. In the closed state, since the drive side connecting rod 11 protrudes from the guide 14 in the Y direction positive side, access from the sealed container end 100 b to the bolt 29 is easy.

  After the circuit opening operation is performed at low speed by the manual operation means of the operation device 1 (not shown), as shown in FIG. 6, the bolt 28 fastening the bidirectional drive mechanism mounting base 27 and the driven side conductor 25 is removed. . Although access to the bolt 28 from the sealed container end 100b requires a long bolt tightening tool, it is easier than removing the bolt in the X direction at the bidirectional drive mechanism attachment as in the prior art .

  From the state of FIG. 6, the bidirectional drive mechanism 10 is moved to the Y direction positive side by using the drive side connecting rod 11 as a guide. At this time, since the drive-side movable pin 18 is in contact with the second linear portion 16C of the first grooved cam 16, no force is transmitted from the drive-side movable pin to the lever 12, and the driven connection rod 13 and the driven side The side arc electrode 5 remains stationary. A state in which the bidirectional drive mechanism mounting base is moved is shown in FIG. The drive-side movable pin 18 is located at the end of the second linear portion 16C of the first groove cam 16. Thereafter, the drive-side movable pin 18 is removed from the drive-side connection rod end 11 b and the bidirectional drive mechanism 10 is taken out of the sealed container 100.

  The shutoff part in a state where the bidirectional drive mechanism 10 is removed is shown in FIG. Although it is necessary to check the first grooved cam 16 of the drive side connecting rod 11 in the sealed tank 100, as shown in FIG. 8, the first grooved cam 16 is not abnormally worn from the sealed container end 100b. You can visually check the

  The driven side arc electrode 5 and the bidirectional drive mechanism 10, which have been inspected or replaced, are attached to the blocking portion in the reverse order of the above. Also in this case, since the bolt fastening operation in the direction of the movement axis of the blocking portion is mainly performed, the bidirectional drive mechanism 10 can be easily attached as compared with the prior art.

  According to this embodiment, since the groove cam of the drive side connecting rod for driving the bidirectional drive mechanism is penetrated to the end portion on the driven side, the weight reduction of the drive side connecting rod can be achieved. Further, the drive side connecting rod bidirectional drive mechanism and the driven side arc electrode can be easily assembled, inspected and replaced to the blocking portion.

  The present invention is not limited to the above-described embodiment, but includes various modifications. For example, the embodiments described above are described in detail in order to explain the present invention in an easy-to-understand manner, and are not necessarily limited to those having all the configurations described. Also, part of the configuration of one embodiment can be replaced with the configuration of another embodiment, and the configuration of another embodiment can be added to the configuration of one embodiment. In addition, with respect to a part of the configuration of each embodiment, it is possible to add, delete, and replace other configurations.

DESCRIPTION OF SYMBOLS 1 ... Manipulator, 2 ... Drive side main electrode, 3 ... Driven side main electrode, 4 ... Drive side arc electrode, 5 ... Driven side arc electrode, 6 ... Shaft , 7: mechanical compression chamber, 8: nozzle, 9: thermal expansion chamber, 10: bi-directional drive mechanism, 11: drive side connecting rod, 12: lever, 13 ... Driven side connection rod, 14 ... Guide, 15 ... Lever fixing pin, 16 ... First groove cam, 16A ... First straight part, 16B ... Connecting part, 16C ... Second Straight part, 17 ... second groove cam, 18 ... drive side movable pin, 19 ... third groove cam, 20 ... driven side movable pin, 21 ... groove of driven side rod Cam, 22: fastening ring, 24: insulating rod, 25: driven conductor, 26: drive conductor, 27: bidirectional drive mechanism With base, 30 ... auxiliary block

Claims (5)

A drive side electrode having a drive side main electrode and a drive side arc electrode, connected to the controller, and provided in the sealed tank;
A driven side electrode which has a driven side main electrode and a driven side arc electrode, and is provided in the sealed tank so as to face the drive side electrode;
And a bi-directional drive mechanism,
The bidirectional drive mechanism is
A drive side connecting rod which receives a driving force from the drive side electrode;
A driven connection rod connected to the driven arc electrode;
A guide in which the drive side connecting rod and the driven side connecting rod move translatably inside;
To be rotatably fixed by a lever fixing pin, connect the driven connection rod and the drive connection rod, and operate the driven connection rod in the opposite direction to the movement of the drive connection rod. Have a lever and
The grooved cam of the drive side connecting rod penetrates to the end on the opposite side of the drive side electrode of the drive side connecting rod. In claim 1,
A gas circuit breaker characterized in that an auxiliary block is detachably attached to an end of the drive side connecting rod opposite to the drive side electrode. In claim 2,
A gas circuit breaker characterized in that the base member to which the bi-directional drive mechanism is attached is detachably attached to the driven side conductor. In claim 2,
The grooved cam portion of the drive connection rod has a first grooved cam including a first straight portion, an inclined portion, and a second straight portion.
A gas circuit breaker characterized in that the first straight portion and the second straight portion are provided on different axes substantially parallel to the drive axis direction, and an inclined portion is provided therebetween. In the gas circuit breaker according to claim 4,
A gas comprising: a first groove cam of the drive side connecting rod, a second groove cam of the guide, and a pin in communication with the inside of the third groove cam of the lever. Circuit breaker.

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