JP2015069921A - Electronic power apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit efficient, stable cutoff performance without increasing the size of a driving device in terms of current cutoff and hence to achieve a compact size and a cost reduction.SOLUTION: A driving device 31 is accommodated in a casing 3, and an insulation operating rod 9 is attached to the driving device 31. The insulation operating rod 9 rotates around the central axis by receiving rotating force from the driving device 31. Crank parts 14a, 14b having a projecting shape are integrally provided on the insulation operating rod 9. The crank parts 14a, 14b are arranged in positions inverted 180 degrees around the insulation operating rod 9. At least one or more support porcelain tubes 4 are fixed on the upper face of the casing 3. A porcelain tube 5 is attached to the upper end part of the support porcelain tube 4 via a center piece 6a. The porcelain tube 5 is attached to the support porcelain tube 4 and the connection part of the support porcelain tube 4 via a center piece 6b.

Description

  Embodiments of the present invention relate to a power device such as a large-capacity two-point breaker capable of breaking from a small current to a large current.

  Various power devices are provided in the power system for stable power supply. For example, a power breaker or a substation is provided with a circuit breaker that quickly cuts off an abnormal current when an accident occurs. As a circuit breaker, an insulator circuit breaker (for example, Patent Document 1) in which an arc extinguishing chamber is built in a porcelain porcelain pipe, a tank type circuit breaker in which an arc extinguishing chamber is arranged in a metal tank, and the like are known.

  Among insulator type circuit breakers, an insulator type circuit breaker used for a circuit of 300 kV or less has a supporting insulator tube installed on a casing containing a driving device and the like, and a porcelain insulator tube is further provided above the supporting insulator tube. , 碍 碍 I-shaped. Although the porcelain porcelain pipe has an arc extinguishing chamber, it is supported at a high position around 5 m above the ground, and a sufficient insulation distance can be secured.

  On the other hand, when it comes to an insulator type circuit breaker used in a high voltage circuit of 300 kV or higher, a two-point breaker with two arc extinguishing chambers connected in series is the mainstream. In this case, the necessary insulation distance from the ground is secured by using one or more support rods, but since two arc extinguishing chambers are connected in series, the two porcelain rods are attached horizontally around the support rods, It is common to arrange the soot tube in a T-shape.

  Here, with reference to FIG. 4 and FIG. 5, a two-point insulator type circuit breaker in which the soot tube is T-shaped will be described in detail. 4 is a cross-sectional view of the entire 2-point insulator type circuit breaker, FIG. 5 (a) is an enlarged cross-sectional view of the insulator type circuit breaker showing the closing state before the interruption operation, and FIG. 5 (b) is the completion of the interruption operation. It is an expanded sectional view of the insulator type circuit breaker which shows a state.

  4 is a T-shaped insulator breaker having a supporting porcelain tube 4 and two porcelain insulator tubes 5 made of porcelain. The insulator circuit breaker is provided with a casing 3 installed on the ground, and a direct-acting drive device 30 is accommodated in the casing 3. The direct-acting drive device 30 is a device that exerts a linear drive force mainly using hydraulic pressure or a spring as a drive source.

  A plurality of support rods 4 are fixed to the upper surface of the casing 3. The support rod 4 is arranged in a straight line with its axial direction perpendicular to the ground. An insulating operation rod 9 extending in the axial direction of the support rod 4 is installed inside the support rod 4. The upper end portion of the insulating operation rod 9 extends upward from the upper end portion of the support rod tube 4. The insulating operation rod 9 receives the driving force of the driving device 30 and reciprocates in the axial direction of the supporting rod tube 4, that is, in the vertical direction.

  A center piece 6 whose axial direction extends horizontally is attached to the upper end of the support rod 4. A lever (not shown) is disposed inside the center piece 6, and the upper end of the insulating operation rod 9 is connected to the lever. Further, an operating rod 8 (shown in FIG. 5) housed in each porcelain porcelain tube 5 is connected to the lever. That is, the insulating operation rod 9 and the operation rod 8 are connected via the lever. At this time, the moving direction of the insulating operating rod 9 and the moving direction of the operating rod 8 are turned 90 degrees by the lever.

  The two porcelain soot tubes 5 are attached to both ends of the center piece 6, are perpendicular to the axial direction of the support soot tube 4 and are horizontal to the ground, and the two soot tubes 5 are arranged in a straight line. . For this reason, the two porcelain soot tubes 5 have a bilaterally symmetric configuration with the support soot tube 4 as a center and a T-shape.

An arc extinguishing chamber is disposed inside each porcelain soot tube 5 and is filled with an arc extinguishing gas such as SF ₆ gas. These two porcelain porcelain tubes 5 are connected in series with the center piece 6 interposed therebetween. On the left and right ends of each porcelain porcelain tube 5, lead terminals 7 are provided. The lead terminal 7 is connected to an arc extinguishing chamber inside the porcelain porcelain tube 5.

  Next, the internal configuration of the porcelain ceramic tube 5 will be described with reference to FIG. The arc extinguishing chamber of the porcelain porcelain tube 5 is composed of a first contact portion and a second contact portion that are arranged to face each other. Among these, the first contact portion is defined as the movable contact portion 1 that can reciprocate along the axial direction of the porcelain porcelain tube 5, and the second contact portion is opposed contact fixed inside the porcelain porcelain tube 5. Defined as child 2 In the following description, the movement direction of the movable contact portion 1 is defined as the direction on the opposite contact portion 2 side as the front and the opposite side as the rear.

  A compression space 10 is formed inside the movable contact portion 1. The compression space 10 is a space that is compressed by the retraction of the movable contact portion 1. In addition, a movable arc contact 12 is disposed in the movable contact portion 1, and an opposing arc contact 11 that is freely contactable with the movable arc contact 12 is disposed in the opposing contact portion 2.

  When the movable contact portion 1 and the opposed contact portion 2 perform a closing operation, the movable arc contact 12 comes into contact with the opposed arc contact 11 and both contact portions 1 and 2 come into contact with each other. Further, when the first contact portion and the second contact portion perform a blocking operation, the movable arc contact 12 is separated from the counter arc contact 11, and the both contact portions 1 and 2 are separated from each other. When the arc contacts 11 and 12 are separated from each other, an arc is generated between them to form an arc space 13.

  An operation rod 8 is installed on the movable contact portion 1. Further, as described above, the operation rod 8 is connected to the insulating operation rod 9 in the supporting rod tube 4 via the lever in the center piece 6. Therefore, the driving force of a driving device (not shown) in the casing 3 is transmitted to the operating rod 8 via the insulating operating rod 9 and the lever in the center piece 6. As the operating rod 8 moves, the movable contact portion 1 reciprocates in the front-rear direction.

  The breaking operation of the insulator breaker having the above configuration will be described. When a driving device (not shown) in the casing 3 starts driving from the input state shown in FIG. 5A, a downward force is applied to the insulating operation rod 9, and the insulating operation rod 9 is pulled toward the ground. Start descent as you can. At this time, a horizontal force perpendicular to the moving direction of the insulating operation rod 9 is applied to the operation rod 8 via the lever in the center piece 6, and the movable contact portion 1 including the operation rod 8 is integrated. Then, it moves backward in the right direction of the drawing (from (a) to (b) of FIG. 5).

  When the movable contact portion 1 moves backward, the compression space 10 is compressed. When the interruption operation proceeds and the opposing arc contact 11 and the movable arc contact 12 are separated, an arc is generated in the arc space 13. Part of the arc energy assists in boosting the compression space 10. When the interruption operation further proceeds and the current zero point is reached as shown in FIG. 5B, the compression space 10 supplies a gas flow to the arc space 13 to extinguish the arc and interrupt the current.

  Further, even in a two-point tank type circuit breaker used in a high voltage circuit, as in the case of the above-mentioned insulator type circuit breaker, it is a mainstream to arrange arc extinguishing chambers symmetrically about the driving device. Also here, the movable contact portion of the arc extinguishing chamber receives a driving force from the driving device via the insulating operation rod, and reciprocates in a direction orthogonal to the moving direction of the insulating operation rod.

JP 2003-217373 A

  By the way, as the capacity of insulator circuit breakers and tank circuit breakers increases, it is important to secure an insulation distance. For this reason, it is often the case that a plurality of support rods are used or the metal tank is enlarged. Accordingly, the distance from the driving device 30 to the movable contact portion 1 becomes longer, and the insulating operation rod 9 that transmits the driving force of the driving device 30 to the movable contact portion 1 tends to be elongated.

  In the configuration in which the linear movement amount of the insulating operation rod 9 determines the reciprocating motion of the movable contact portion 1, if the insulating operation rod 9 becomes longer, the insulation operation rod 9 starts to move and finally moves. It takes a long time to reach the movable contact portion 1. That is, the propagation of the operation may be delayed in the circuit breaker operation. Since the circuit breaker plays a role of disconnecting the accident point on the power system from the power system, the stability of the system will increase if the disconnecting work time, that is, the opening time from the time when the opening circuit command is issued until the contact parts are separated from each other, increases. May be damaged.

  When the insulating operation rod 9 is elongated, depending on the material, deformation such as expansion or contraction is likely to occur due to the force applied during reciprocation. For example, in the conventional examples shown in FIGS. 4 and 5, when the drive device 30 operates when the current is interrupted, the insulating operation rod 9 is pulled in the ground direction, so that elongation is likely to occur. When the size of the insulating operation rod 9 is extended, there may be a variation in the operation speed at the initial stage of opening and the operation speed from the middle to the end of the opening in the breaking process, and the breaking performance becomes unstable.

  Furthermore, conventionally, the movement direction of the insulating operation rod 9 that receives the driving force of the driving device 30 and the movement direction of the movable contact portion 1 of the arc extinguishing chamber are the vertical direction and the front-rear direction, and are orthogonal to each other. . Therefore, when the drive energy of the drive device 30 is transmitted to the movable contact portion 1, a loss occurs in the drive energy. Therefore, the drive energy of the drive device 30 is not efficiently used, and the drive device must be enlarged to fill the drive energy loss. Moreover, since levers are indispensable for changing the direction of movement, the number of parts increases and the cost increases.

  The embodiment of the present invention solves the problems of the prior art as described above, and can exhibit an efficient and stable interrupting performance without increasing the size of the drive device in current interrupting, thereby reducing the size and cost. It is an object to provide the intended power equipment.

In order to achieve the above object, an embodiment of the present invention includes the following components (a) to (e).
(A) A driving device that is housed in a casing and that uses a rotational force as a driving force.
(B) One or more porcelain support rods arranged at the top of the casing.
(C) A porcelain soot tube filled with an arc extinguishing gas and disposed in a direction orthogonal to the support soot tube.
(D) A first contact portion disposed opposite to the central axis of the porcelain porcelain tube and capable of reciprocating along the axial direction of the porcelain porcelain tube, and a second contact portion facing the first contact portion.
(E) A crank portion that is connected to the driving device and the first contact portion and converts a rotational force of the driving device into an operating force of the first contact portion.

Sectional drawing which shows the whole insulator type circuit breaker in 1st Embodiment by this invention. The expanded sectional view of the interruption | blocking part periphery in 2nd Embodiment by this invention. Sectional drawing which shows the whole insulator type circuit breaker in 3rd Embodiment by this invention. Sectional drawing which shows the whole insulator type circuit breaker of a prior art. It is an expanded sectional view of the insulator type circuit breaker of FIG. 4, (a) shows the closing state before interruption | blocking operation | movement, (b) shows the completion state of interruption | blocking operation | movement.

  Embodiments of the present invention will be specifically described below with reference to the drawings. In addition, the same code | symbol is attached | subjected about the same structural member as the prior art example shown in FIG.4 and FIG.5, and description is abbreviate | omitted.

(1) First Embodiment [1-1. Constitution]
FIG. 1 is a sectional view showing the entire two-point insulator type circuit breaker according to the first embodiment of the present invention. As shown in FIG. 1, a casing 3 installed on the ground is provided in the first embodiment, and a driving device 31 is accommodated in the casing 3. The driving device 31 is a motor that uses a rotational force as a driving force.

  An insulating operation rod 9 is attached to the drive device 31. The insulating operation rod 9 receives the rotational force from the driving device 31 and rotates around the central axis. Crank portions 14 a and 14 b having a convex shape are provided integrally with the insulating operation rod 9. The crank portion 14a is provided near the upper end portion of the insulating operation rod 9, and the crank portion 14b is provided below the crank portion 14a.

  The protruding direction of the convex portions of the crank portions 14a, 14b is orthogonal to the axial direction of the insulating operation rod 9, and is horizontal with respect to the ground. Further, the protruding directions of the convex portions of the crank portions 14a and 14b are opposite to each other, with the upper crank portion 14a facing the right side in FIG. 1 and the lower crank portion 14b facing the left side in FIG.

  That is, the crank portions 14a and 14b are disposed at positions that are inverted 180 degrees with the insulating operation rod 9 as the center. The arm length which becomes the rotation radius of the crank portions 14a and 14b is set to the same length. These crank portions 14 a and 14 b are portions that convert the rotational force of the driving device 31 into the operating force of the movable contact portion 1.

  In the state shown in FIG. 1, both the upper crank portion 14a and the lower crank 14b have the operating rod 8 rotatably connected to the outside of the convex portion, that is, the tip portion of the protruding portion. That is, the mounting direction of the operating rod 8 with respect to the crank portions 14a and 14b is the same in the upper crank portion 14a and the lower crank 14b. At this time, in the two porcelain porcelain tubes 5, the movable contact portion 1 is in the advanced state.

  At least one supporting porcelain tube 4 made of porcelain is fixed to the upper surface of the casing 3. A center piece 6 a is attached to the upper end portion of the support rod tube 4, and a center piece 6 b is attached to the connection portion between the support rod tube 4 and the support rod tube 4. A porcelain soot tube 5 is attached to the right end of the center piece 6a, and a porcelain soot tube 5 is attached to the left end of the center piece 6a. Each of these two porcelain porcelain pipes 5 has an arc extinguishing chamber and is filled with an arc extinguishing gas. Each porcelain porcelain tube 5 is arranged at a position where a sufficient insulation distance from the ground can be secured.

  Each porcelain soot tube 5 is arranged in a direction orthogonal to the axial direction of the support soot tube 4 (direction in which the axial direction of the porcelain soot tube 5 is parallel to the ground). In the first embodiment, the two porcelain soot tubes 5 are not T-shaped with the support soot tube 4 as the center, but are vertically displaced. Each porcelain porcelain tube 5 is provided with a movable contact portion 1 that can reciprocate along the axial direction. Each movable contact portion 1 is provided with an operating rod 8, and the end of the operating rod 8 is rotatably connected to the convex portions of the crank portions 14a and 14b.

[1-2. Action]
When the first embodiment starts the shut-off operation, the insulating operation rod 9 is rotated about the rod axis by the rotational motion of the motor of the drive device 31 and the crank portion provided integrally with the insulating operation rod 9 14a and 14b rotate. Due to the rotation of the crank portions 14a and 14b, the operation rod 8 connected to the crank portions 14a and 14b moves rearward in the axial direction of the arc extinguishing chamber.

  That is, the movable contact portion 1 including the operation rod 8 moves backward integrally while the crank portions 14a and 14b rotate 180 degrees by a distance corresponding to the arm length of the crank portions 14a and 14b. When the movable contact portion 1 moves backward, as in the conventional example shown in FIG. 5, the compression space 10 supplies a gas flow to the arc space 13, extinguishes the arc, and interrupts the current.

  Further, when the first embodiment performs the closing operation, the drive device 31 is operated by a rotary motion of a motor or the like so that the insulating operation rod 9 is further rotated 180 degrees and is connected to the crank portions 14a and 14b. 8 moves forward in the axial direction of the arc extinguishing chamber. At this time, when the crank portions 14a and 14b rotate 180 degrees by a distance corresponding to the arm length of the crank portions 14a and 14b, the movable contact portion 1 including the operation rod 8 moves integrally, and the crank portion 14a. , 14b return to the original position. Thereby, the circuit breaker ends the closing operation.

[1-3. effect]
In the first embodiment, the insulating operation rod 9 and the crank portions 14a and 14b are rotated using the rotational force of the driving device 31, and the reciprocating motion of the arc extinguishing chamber is realized using the rotational motion of the crank portions 14a and 14b. To do. For this reason, in the breaking operation of the circuit breaker, it is not necessary to move the insulating operation rod 9 in the axial direction.

  Therefore, even if the insulating operation rod 9 is elongated using a plurality of support rods 4, there is no fear that propagation of the blocking operation through the insulating operation rod 9 is delayed. That is, even when the insulation operation rod 9 is lengthened to ensure a large insulation distance, there is no possibility that the opening time from when the opening command is issued until the contact parts are separated from each other increases. Therefore, the stability of the system can be obtained while ensuring a sufficient insulation distance, and the reliability as a circuit breaker is improved.

  Further, in the first embodiment, since no axial force is applied to the insulating operation rod 9 during the breaking operation and closing operation of the circuit breaker, the insulating operation rod 9 can avoid deformation due to expansion and contraction. . Therefore, the speed of the blocking operation does not vary due to the deformation of the insulating operation rod 9, and the instability of the blocking performance can be suppressed.

  Furthermore, compared with the case where the linear movement force in the axial direction of the insulating operation rod 9 is used, in the first embodiment using the rotational force of the insulating operation rod 9, it is easy to reduce the drive energy. This can contribute to the downsizing of the driving device 31. In addition, in the first embodiment, a lever or the like for changing the direction of movement is unnecessary, which is advantageous in terms of cost by reducing the number of parts. According to the embodiment as described above, a circuit breaker having an efficient and stable breaking performance can be realized at low cost without enlarging the driving device 31 in current breaking.

[2. Second Embodiment]
[2-1. Constitution]
A second embodiment will be described with reference to FIG. FIG. 2 is an enlarged cross-sectional view of the periphery of the blocking portion in the second embodiment. The basic configuration of the second embodiment is the same as that of the first embodiment, and the feature is that the arm length 15a of the upper crank portion 14a is different from the arm length 15b of the lower crank portion 14b. It is in. In the second embodiment, the arm length 15a is longer than the arm length 15b. The same components as those in the first embodiment are denoted by the same reference numerals and description thereof is omitted.

[2-2. Action]
In the second embodiment, as in the first embodiment, the movable contact including the operation rod 8 is performed while the crank portions 14a and 14b rotate 180 degrees at a distance corresponding to the rotation radius of the crank portions 14a and 14b. The child part 1 moves integrally. At this time, since the arm lengths 15a and 15b of the two crank portions 14a and 14b are different in the second embodiment, the moving distance of the movable contact portion 1 is different between the two porcelain insulators 5. As a matter of course, the circuit breaker is completely turned on when the crank portion 14 is returned to its original position by further rotating 180 degrees.

[2-3. effect]
According to the second embodiment as described above, in addition to the effects of the first embodiment, the arm length 15a of the crank portion 14a and the arm length 15b of the crank portion 14b are different. The moving distance of the movable contact portion 1 of the arc extinguishing chamber can be set differently. For this reason, arc extinguishing chambers having different ratings can be used simultaneously.

  Therefore, the variation of the circuit breaker according to the interruption duty can be increased. Moreover, by changing the arm lengths 15a and 15b of the crank portions 14a and 14b, the moving distance of the movable contact portion 1 can be easily adjusted, and an increase in cost due to excessive specifications can be suppressed.

[3. Third Embodiment]
[3-1. Constitution]
A third embodiment will be described with reference to FIG. FIG. 3 is a cross-sectional view showing an entire insulator breaker according to the third embodiment. The feature of the third embodiment is as follows. That is, in the third embodiment, the crank portions 14a and 14b are provided with the protruding directions of the convex portions in the same direction with the insulating operation rod 9 as the center.

  In the state shown in FIG. 3, the operation rod 8 is rotatably connected to the inside of the convex portion, that is, the concave portion of the upper crank portion 14 a. On the other hand, in the lower crank 14b, the operation rod 8 is rotatably connected to the outside of the projection, that is, the tip of the protrusion. At this time, in the upper porcelain porcelain tube 5, the movable contact portion 1 is retracted and separated from the opposing contact portion 2. On the other hand, in the lower porcelain porcelain tube 5, the movable contact portion 1 is advanced and is in contact with the opposing contact portion 2.

  In such a third embodiment, the mounting direction of the operating rod 8 with respect to the crank portions 14a, 14b is reversed 180 degrees between the upper crank portion 14a and the lower crank 14b. The arm lengths of the crank portions 14a and 14b are set to be the same. Further, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[3-2. Action]
In the third embodiment, the insulating operation rod 9 having the crank portions 14a and 14b is rotated by the rotational movement of the driving device 31, and the operation rods 8 connected to the crank portions 14a and 14b are moved. At this time, the protruding directions of the protruding portions of the crank portions 14a and 14b are the same, but the mounting direction of the operation rod 8 is reversed by 180 degrees. Therefore, although each operation rod 8 and each movable contact portion 1 including the operation rod 8 move in the same direction, if one is a closing operation, the other is a blocking operation.

  As described above, in the state shown in FIG. 3, the movable contact portion 1 accommodated in the upper porcelain soot tube 5 is retracted and cut off, and the movable contact portion 1 accommodated in the lower porcelain soot tube 5 is movable. The side contact portion 1 moves forward and is in the input state. When the insulating operating rod 9 rotates from this state, the recessed portion of the upper crank portion 14a and the operating rod 8 connected thereto move to the right in FIG. 3 and move forward in the axial direction of the arc extinguishing chamber. The movable contact portion 1 moves and performs a closing operation. When the movable contact portion 1 completes the closing operation, the operating rod 8 is positioned at the tip of the protruding portion of the upper crank portion 14a.

  Further, the distal end portion of the protruding portion of the lower crank portion 14b and the operation rod 8 connected thereto also move in the right direction in FIG. 3, and the movable contact portion 1 performs a blocking operation. When the movable contact portion 1 completes the blocking operation, the operating rod 8 is positioned in the recessed portion of the lower crank portion 14a. As a matter of course, when the crank part 14a, 14b is returned to its original position by further rotating 180 degrees, the movable contact part 1 connected to the crank part 14a side completes the shut-off operation, and the crank part 14b The movable contact portion 1 connected to the side completes the closing operation.

[3-3. effect]
According to the third embodiment, in addition to the effects of the first embodiment, the following unique effects can be obtained. That is, in the third embodiment, the operation rod 8 is connected to the tip of the protruding portion of the crank portion 14a, and the operation rod 8 is connected to the recessed portion of the crank portion 14b, so that the two arc extinguishing chambers are reversed. It is possible to operate in the direction. Therefore, a plurality of circuit breakers having different operation timings can be provided simultaneously, and various situations can be handled.

(3) Other Embodiments The above-described embodiments are presented as examples in this specification, and are not intended to limit the scope of the invention. In other words, the present invention can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the scope of the invention. These embodiments and modifications thereof are included in the invention described in the claims and equivalents thereof in the same manner as included in the scope and gist of the invention.

  For example, in the third embodiment, the arm lengths 15a and 15b of the crank portions 14a and 14b are set to be the same, but the arm lengths 15a and 15b of the crank portions 14a and 14b may be set to be different from each other. Moreover, in said embodiment, although it is set as the insulator type circuit breaker, it can implement also with a tank type circuit breaker. In addition, the two-point breaker is a typical example, but it can also be used for a one-point break, and even for a two-point break, one is a gas breaker and the other is a vacuum breaker or disconnection. It is also possible to use it as a composite power device such as a container.

DESCRIPTION OF SYMBOLS 1 ... Movable contact part 2 ... Opposing contact part 3 ... Casing 4 ... Supporting soot pipe 5 ... Porcelain soot pipe 6, 6a, 6b ... Centerpiece 7 ... Drawer terminal 8 ... Operating rod 9 ... Insulating operating rod 10 ... Compression space 11 ... Opposing arc contact 12 ... movable arc contact 13 ... arc spaces 14a, 14b ... crank portions 15a, 15b ... arm lengths 30, 31 ... drive device

Claims (4)

A driving device housed in a casing and using a rotational force as a driving force;
One or more porcelain support rods disposed on top of the casing;
A porcelain soot tube filled with an arc extinguishing gas and disposed in a direction orthogonal to the support soot tube;
A first contact portion disposed opposite to the central axis of the porcelain porcelain tube and reciprocating along the axial direction of the porcelain porcelain tube; and a second contact portion facing the first contact portion;
A power device, comprising: a crank portion coupled to the drive device and the first contact portion, for converting a rotational force of the drive device into an operating force of the first contact portion. Connecting an insulating operating rod to the drive device;
The insulating operation rod is provided with a plurality of the crank portions,
2. The power device according to claim 1, wherein at least one of the crank portions is provided at a position that is 180 degrees reversed with respect to another crank portion around the axis of the insulating operation rod. Connecting an insulating operating rod to the drive device;
The insulating operation rod is provided with a plurality of the crank portions,
The crank portion includes a crank portion facing in the same direction around the axis of the insulating operation rod, and at least one of the crank portions facing in the same direction is connected to the first contact portion outside the convex portion. The power device according to claim 1, wherein the first contact portion is connected to the inside of the convex portion as another one. The power device according to claim 1, wherein a plurality of the crank portions are provided, and the crank portions include those having different arm lengths.

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