JP6132744B2 - Gas circuit breaker - Google Patents

Description

  The present invention relates to a gas circuit breaker to which a bidirectional drive mechanism for driving electrodes in opposite directions is applied.

  A gas circuit breaker used for a high-voltage power system is generally called a puffer type that uses a rise in arc-extinguishing gas pressure during the opening operation and blows a compressed gas against the arc generated between the electrodes to cut off the current. It is used for.

  In order to improve the shut-off performance of the puffer-type gas circuit breaker, a bidirectional driving method has been proposed in which the driven electrode fixed in the past is driven in the direction opposite to the driving direction of the driving electrode.

  For example, Patent Document 1 proposes a method using a fork-type lever. In this invention, the fork-type lever is rotated by the pin interlocked with the movement on the driving side coming into contact with the hollow portion of the fork, and this is converted into a reciprocating motion in the opening / closing axis direction. The driving side electrode is driven in the opposite direction to the driving direction. When the pin is separated from the fork recess, the lever is held in position and the driven-side arc electrode is stationary.

  An object of the present invention is to efficiently move the driven side with a minimum driving force in a time region necessary for current interruption.

  Patent Document 2 proposes a bidirectional drive system using a groove cam. This is to drive the driven-side arc electrode connected to the cam in the direction opposite to the driving-side electrode by moving the pin in the groove cam according to the movement on the driving side and rotating the cam. . A desired speed ratio between the driven-side arc electrode and the driving-side electrode can be realized by making the groove cam into an arbitrary shape.

US Pat. No. 6,271,494 JP 2003-109480 A

  However, since the shape of the fork-type lever described in Patent Document 1 is composed of only a straight portion and an arc portion, there is a problem that the speed on the driven side cannot be set arbitrarily. In addition, the pin may come into contact with the recess of the fork lever every time the opening / closing operation is performed, and an excessive force may be applied to the fork lever.

  In Patent Document 2, the speed on the driven side can be arbitrarily set by the groove cam. However, since the groove cam has a substantially arc shape and the driven side always operates with respect to the movement on the driving side, the movement on the driven side is desired. It is difficult to limit to the time domain. Further, since the groove cam is substantially arc-shaped, there is a problem that the apparatus becomes large.

  In order to solve the above problems, a gas circuit breaker according to the present invention is provided with a driving side electrode and a driven side electrode facing each other in a sealed tank, and the driving side electrode includes a driving side main electrode and a driving side arc electrode. The driven-side electrode has a driven-side main electrode and a driven-side arc electrode, the driven-side arc electrode is connected to an operating device, and the driven-side arc electrode is connected to a bidirectional drive mechanism section To do. The bidirectional drive mechanism includes a driving side connecting rod that receives a driving force from the driving side electrode, a driven side connecting rod that is connected to the driven side arc electrode, and the operation of the driving side connecting rod. A main lever that moves the driven side connecting rod in the opposite direction; a guide that defines the operation of the driving side connecting rod and the driven side connecting rod; and an auxiliary lever that is rotatably held by the guide. A movable pin is provided in each of the first groove cam of the drive side connecting rod, the second groove cam provided in the main lever, the communication hole provided in the auxiliary lever, and the pin communication portion provided in the guide. The movable pin moves in the respective groove cams by the operation of the driving side rod, thereby rotating the main lever, so that the driven side connecting rod is opposite to the driving side connecting rod. The driven-side arc electrode connected to the driven-side connecting rod is driven in the direction opposite to the driving-side arc electrode of the driving-side electrode connected to the driving-side connecting rod.

  According to the present invention, it is possible to realize a groove cam shape capable of reducing the energy of the operating device while ensuring the interruption performance, and the operating energy can be reduced as compared with the conventional bidirectional driving method. Further, by combining the groove cam, it is possible to relieve excessive force acting on the movable pin while realizing a shutoff operation according to the shutoff characteristics, and thus it is possible to realize a highly reliable bidirectional drive mechanism. Furthermore, the size can be reduced as compared with the conventional bidirectional driving mechanism.

It is detail drawing of the bidirectional | two-way drive mechanism of the gas circuit breaker which concerns on embodiment of this invention. The state immediately before the start of operation of the driven electrode is shown during the opening of the blocking part. It is a figure which shows the closing state of the gas circuit breaker which concerns on embodiment of this invention. It is a front view of the bidirectional | two-way drive mechanism of the gas circuit breaker which concerns on embodiment of this invention. It is a disassembled perspective view of the bidirectional | two-way drive mechanism of the gas circuit breaker which concerns on embodiment of this invention. It is detail drawing of the bidirectional | two-way drive mechanism of the gas circuit breaker which concerns on embodiment of this invention. The state immediately after completion | finish of operation | movement of a to-be-driven side electrode in the middle of opening of a interruption | blocking part is shown. It is a figure which shows the stroke characteristic of the gas circuit breaker which concerns on embodiment of this invention. It is a figure which shows the state just before operation | movement of the to-be-driven side arc electrode in the middle of the opening of the gas circuit breaker which concerns on embodiment of this invention. It is a figure which shows the state immediately after a movable pin reaches the connection part of a 1st groove | channel cam in the middle of opening of the gas circuit breaker which concerns on embodiment of this invention, and the operation | movement of a to-be-driven side arc electrode is started. It is a figure which shows the state of the operation | movement final stage of a to-be-driven side arc electrode before the movable pin passes through the connection part of a 1st groove | channel cam in the middle of the opening of the gas circuit breaker which concerns on embodiment of this invention. It is a figure which shows the state of the completion | finish of operation | movement of a to-be-driven side arc electrode in the middle of the opening of the gas circuit breaker which concerns on embodiment of this invention. It is a figure which shows the opening state of the gas circuit breaker which concerns on embodiment of this invention. It is a figure which shows the speed ratio of the drive side arc electrode 4 and the driven side arc electrode 5 of the gas circuit breaker which concerns on embodiment of this invention.

  Hereinafter, a gas circuit breaker according to an embodiment of the present invention will be described with reference to the drawings. In addition, the following is an example of implementation to the last, and is not intended to limit the content of the invention to the following specific embodiment. The invention itself can be carried out in various modes according to the contents described in the claims. In the following embodiments, an example of a circuit breaker having a mechanical compression chamber and a thermal expansion chamber will be described. However, the present invention can be applied to, for example, a circuit breaker having only a mechanical compression chamber.

  In FIG. 2, the injection state of the gas circuit breaker in embodiment of this invention is shown.

  In the sealed tank 100, a driving electrode and a driven electrode are provided coaxially facing each other. The driving side electrode has a driving side main electrode 2 and a driving side arc electrode 4, and the driven electrode has a driven side main electrode 3 and a driven side arc electrode 5.

  An operating device 1 is provided adjacent to the sealed tank 100. A shaft 6 for transmitting a driving force is connected to the operating device 1, and a driving-side arc electrode 4 is provided at the tip of the shaft 6. The shaft 6 and the drive side arc electrode 4 are provided through the mechanical compression chamber 7 and the thermal expansion chamber 9.

  The drive-side main electrode 2 and the nozzle 8 are provided on the thermal expansion chamber 9 on the side of the blocking portion. A driven-side arc electrode 5 is provided coaxially so as to face the driving-side arc electrode 4. One end of the driven-side arc electrode 5 and the tip of the nozzle 8 are connected to the bidirectional drive mechanism unit 10.

  As shown in FIG. 2, the gas circuit breaker is set at a position where the driving side main electrode 2 and the driven side main electrode 3 are electrically connected to each other by the hydraulic pressure of the operating device 1 or a driving source by a spring in the on state. Configure the power system circuit.

  When interrupting a short-circuit current due to lightning or the like, the operating device 1 is driven in the opening direction, and the driving side main electrode 2 and the driven side main electrode 3 are separated through the shaft 6. At that time, an arc is generated between the driving side arc electrode 4 and the driven side arc electrode 5. The arc is extinguished by mechanical arc extinguishing gas blowing by the mechanical compression chamber 7 and arc extinguishing gas blowing utilizing arc heat by the thermal expansion chamber 9 to cut off the current.

  In order to reduce the operation energy of the puffer type gas circuit breaker, a bidirectional driving mechanism 10 for driving the driven-side arc electrode fixed in the past in the direction opposite to the driving direction of the driving-side electrode is provided. Hereinafter, the bidirectional driving method according to the embodiment of the present invention will be described with reference to FIGS. 1, 3, and 4.

  As shown in FIGS. 1, 3, and 4, the bidirectional drive mechanism 10 of the present invention holds the driven side connecting rod 13 and the driving side connecting rod 11 movably in the blocking operation direction with a guide 14, The guide 14 is configured to be connected by a main lever 12 rotatably provided.

  A first groove cam 16 is cut into the drive side connecting rod 11, and is composed of a second straight portion 16C, a connecting portion 16B, and a first straight portion 16A when viewed from the operating device side. The first straight portion 16A and the second straight portion 16C are provided on different axes, and the connecting portion 16B is provided therebetween. In addition, the shape of the connection part 16B can be arbitrarily designed according to the operation characteristic of the interruption | blocking part, for example, can be considered as a curve or a straight line.

  The drive-side connecting rod 11 is limited in vertical displacement by grooves (14A and 14B in FIG. 4) provided in the guide 14, and can move only in the horizontal direction with respect to the opening / closing operation axis of the blocking portion.

  The drive side movable pin 17 is communicated with the second groove cam 18 and the first groove cam 16 cut into the main lever 12 and the communication hole 19 of the auxiliary lever 20. At this time, the guide 14 is provided with a notch-shaped pin communication portion 14 </ b> C to prevent interference between the drive-side movable pin 17 and the guide 14. The pin communication portion 14 </ b> C may be a communication hole that covers the movable range of the drive side movable pin 17. By using the communication hole, the mechanical strength of the guide 14 can be improved.

  The auxiliary lever 20 rotates with the auxiliary lever fixing pin 21 arranged at a position different from the axis of the main lever fixing pin 15 as the rotation axis, and the driving side movable pin 17 moves through the second groove cam 18, whereby the main lever The main lever 12 rotates around the fixed pin 15 as a rotation axis.

  At this time, when the driving side movable pin 17 moves on the connecting portion 16B of the first groove cam, a force acts on one side of the connecting portion 16B, and the rotation direction of the auxiliary lever 20 is defined.

  As the auxiliary lever 20 rotates, a force acts on one side of the second groove cam, and the rotation direction of the main lever 12 is defined. Since the drive-side movable pin 17 can move in the longitudinal direction of the second groove cam 18 through the rotation of the auxiliary lever 20, excessive force acting on the pin during the opening / closing operation can be reduced.

  The main lever driven side guide groove 23 cut into the main lever 12 by this rotational movement transmits a force to the driven side movable pin 22 attached to the driven side connecting rod 13, so that the driven side connecting rod 13 is driven in the opposite direction to the drive side connecting rod 11. As a result, the driven-side arc electrode 5 connected to the driven-side connecting rod 13 is driven to the side opposite to the driving-side arc electrode 4 connected to the driving-side connecting rod 11.

  The distance d between the driving side connecting rod 11 and the driven side connecting rod 13 is determined by the difference between the outer diameter of the tip of the nozzle 8 and the diameter of the driven side arc electrode 5.

  Further, the arm length La_1 on the driving side and the arm length Lb_1 on the driven side vary depending on the rotation angle during the operation of the main lever 12, but La_1 <Lb_1 at any angle.

  In this case, the force for moving the driven side is larger than that in the case of Lb_1 <La_1, but this force is particularly problematic because the weight of the driven-side arc electrode 5 is overwhelmingly smaller than the weight on the driving side. Don't be. Since the light driven-side arc electrode 5 can be moved quickly relative to the driving side, the necessary relative speed can be ensured while reducing the operating force.

  For example, as shown in FIG. 2, the bidirectional driving mechanism 10 and the driving side are connected by attaching a fastening ring 24 to the nozzle 8, and providing a hole through which the tip of the driving side connecting rod 11 penetrates the fastening ring 24. The side fastening screw 25 is structured to be tightened with a nut.

  The main lever fixing pin 15 may be configured to penetrate the guide 14 and the main lever 12 by one member, but as shown in FIGS. 3 and 4, two members are provided at both ends of the guide 14, It is desirable that the main lever 12 be held so as to be rotatable from both sides.

  In order to prevent the main lever fixing pin 15 from being removed from the guide 14, for example, grooves can be cut at both ends of the pin and the main lever fixing pin retaining ring 26 can be fitted into each of the grooves.

  With such a configuration, the main lever fixing pin 15 can be designed without the possibility of interfering with the drive side connecting rod 11, so that the degree of freedom in design is improved.

  The auxiliary lever fixing pin 21 may be configured to penetrate the guide 14 with a single member. However, as shown in FIGS. 3 and 4, two members are provided at both ends of the guide 14, respectively. It is desirable to have a configuration in which 20 is rotatably held on each side.

  The auxiliary lever 20 is provided outside the guide 14, and a cylindrical spacer 31 is provided between the guide 14 and the auxiliary lever 20 in order to avoid interference with the main lever fixing pin 15. The auxiliary lever fixing pin 21 is provided on the guide 14 through the spacer 31.

  In order to prevent the auxiliary lever fixing pin 21 from being detached from the guide 14, for example, grooves can be cut at both ends of the pin and the auxiliary lever fixing pin retaining ring 30 can be fitted into each of the grooves.

  By adopting such a configuration, the auxiliary lever fixing pin 21 can be designed without the possibility of interfering with the main lever 12, so that the degree of design freedom is improved.

  As shown in FIG. 1, the main lever 12 has an angle θa of 90 degrees or more and less than 180 degrees. This angle θa is provided on the operating device 1 side. This angle θa is a straight line (hereinafter referred to as Lb_1) connecting the center point of the main lever fixing pin 15 and the center point of the driven side movable pin 22 in the state immediately before the opening operation of the driven side electrode 5 shown in FIG. .) And the angle θb_1 formed by the Y axis, and the center point of the main lever fixing pin 15 and the center point of the driven side movable pin 22 in a state immediately after the opening operation of the driven side electrode 5 shown in FIG. The angle θb_2 formed by the straight line (hereinafter referred to as Lb_2) and the Y axis is set to be equal.

  If the configuration is such that θ1_1> θ2_1, Lb_1 in the state of FIG. 1 is larger than Lb_2 in the state of FIG. Since the main lever driven side guide groove 23 is cut in accordance with the large dimension Lb_1, the main lever 12 must be configured longer than in the case of θ1_1 = θ2_1. As the main lever 12 becomes longer, the diameter of the trajectory of rotation of the main lever 12 becomes longer, so that the width in the vertical direction (the dimension in the height direction of the bidirectional drive mechanism) increases with respect to the opening / closing axis of the bidirectional drive mechanism.

  On the other hand, if θ1_1 and θ2_1 are configured to be equal, Lb_1 and Lb_2 can be made the same length, so that the length of the main lever 12 can be minimized. By doing so, it is possible to minimize the width in the vertical direction (the dimension in the height direction of the bidirectional drive mechanism) with respect to the opening / closing axis of the bidirectional drive mechanism, and a space-saving mechanism can be realized.

  A straight line (hereinafter referred to as La_1) connecting the center point of the main lever fixing pin 15 and the center point of the drive side movable pin 17 shown in FIG. 1 is located on the right side of the paper surface (that is, on the operating device 1 side) with respect to the Y axis. When the angle formed by the Y axis and La_1 is θc_1, θc_1> 0.

  A straight line (hereinafter referred to as La_2) connecting the center point of the main lever fixing pin 15 and the center point of the drive side movable pin 17 shown in FIG. If the angle formed by the X axis and La_2 is θc_2, θc_2> 0.

  1 and 5, when the driving side movable pin 17 displaces the connecting portion 16B and the driving side movable pin 17 moves on the connecting portion 16B of the first groove cam 16, the force received from the surface of the connecting portion 16B. Thus, a rotational force in one direction is always applied to the main lever 12. The main lever 12 has a bifurcated structure at the lower end of the lever so as to sandwich the drive side connecting rod 11 so as to receive the reaction force from the drive side movable pin 17 evenly.

  Hereinafter, each state during the opening operation will be described with reference to FIGS.

  FIG. 6 is a diagram in which time is taken on the horizontal axis, and driving side electrode stroke and driven side electrode stroke are taken on the vertical axis.

  The time a is the opening start time, and the time b is the time immediately before the operation of the driven-side arc electrode 5 (state in FIG. 7).

  Time c is a state where the driving side movable pin 17 reaches the connecting portion 16B of the first groove cam 16 (a state shown in FIG. 8), that is, a time immediately after the start of the operation of the driven side arc electrode 5.

  Time d is the time when the driven-side arc electrode 5 is at the end of the operation, just before the driving-side movable pin 17 passes through the connecting portion 16B of the first groove cam (state of FIG. 9).

  Time e is the time when the operation of the driven-side arc electrode 5 ends (state shown in FIG. 10). The time f is the time when the driving side operation is completed and the open state is reached (state shown in FIG. 11).

  The stroke of both electrodes at each time represents, for example, the stroke from time a to time b of the drive side arc electrode 4 as s4ab.

  FIG. 7 is a view showing a state immediately before the driven-side arc electrode 5 is operated. In the stroke from time a to time b, the drive side arc electrode 4 is s4ab (≠ 0), the driven side arc electrode 5 is s5ab (= 0), and the driven side arc electrode 5 is stationary.

  That is, the driven-side arc electrode 5 is stationary while the linear portion of the second linear portion 16C of the first groove cam passes through the driving-side movable pin 17 (this state is hereinafter referred to as intermittent driving). . That is, the driven side can be moved only in an arbitrary time region by adjusting the length of the second straight portion 16C.

  FIG. 8 is a diagram showing a state immediately after the driving side movable electrode 17 reaches the connecting portion 16B of the first groove cam and the operation of the driven side arc electrode 5 is started. In the stroke from time a to time c indicating the stroke during this period, the drive side arc electrode 4 is s4ac (> s4ab), the driven side arc electrode 5 is s5ac (> s5ab), and both electrodes are operating. At this time, the drive side movable pin 17 reaches the connecting portion 16B of the first groove cam 16 and simultaneously moves in the second groove cam 18 through the rotation of the auxiliary lever 20.

  FIG. 9 is a diagram showing a state in the final stage of the operation of the driven-side arc electrode 5 before the driving-side movable pin 17 passes through the connecting portion 16B of the first groove cam 16. In the stroke from time a to time d indicating the stroke during this period, the drive side arc electrode 4 is s4ad (> s4ac), the driven side arc electrode 5 is s5ad (> s5ac), and both electrodes are operating. At this time, the drive side movable pin 17 moves in the second groove cam 18 through the rotation of the auxiliary lever 20 simultaneously with the movement of the connecting portion 16B of the first groove cam 16.

  FIG. 10 is a diagram showing a state in which the operation of the driven-side arc electrode 5 is completed. The stroke from time a to time e is s4ae (> s4ad) for the driving side arc electrode 4 and s5ae (> s5ad) for the driven side arc electrode 4, and both electrodes are moving. At this time, the drive-side movable pin 17 reaches the first linear portion 16A of the first groove cam and simultaneously moves in the second groove cam 18 through the rotation of the auxiliary lever 20.

  FIG. 11 is a diagram showing an open state. In the stroke from time a to time f, the drive-side arc electrode 4 is s4af (> s4ae), the driven-side arc electrode 5 is s5af (= s5ae), and the driven-side arc electrode 5 is stationary. While the linear portion of the first groove cam 16 passes through the driving side movable pin 17, an intermittent driving state in which the driven side arc electrode 5 is stationary is realized.

  As described above, the drive-side movable pin 17 rotates the auxiliary lever 20 and moves the second groove cam 18 at the curved portion 16B of the groove cam, thereby rotating the main lever 12 and opening the driven-side arc electrode 5. Driving in the direction opposite to the polar direction, and the operation of the driving side movable pin 17 is restricted by the auxiliary lever 20 at the first linear portion 16A and the second linear portion 16C of the first groove cam 16, the driven side arc electrode 5 is driven. Is in an intermittent drive state where it stops.

  As in this embodiment, when the drive side movable pin 17 moves in the connecting portion 16B of the first groove cam 16, the drive side movable pin 17 is moved in the longitudinal direction of the second groove cam 18 through the rotation of the auxiliary lever 20. Since it can move in the direction, excessive force acting on the drive side movable pin 17 can be reduced.

  In other words, the drive side movable pin 17 allows the force received when contacting the connecting portion 16B of the first groove cam 16 to escape in the rotational direction of the auxiliary lever 20 and move in the longitudinal direction of the second groove cam 18, so that the opening and closing operation can be performed. An excessive force applied to the first groove cam 16 and the second groove cam 18 can be reduced. Thereby, a highly reliable bidirectional drive mechanism is realizable.

  Further, the design of the groove cam can be easily changed according to the model of the blocking portion structure and blocking method, and the groove cam shape corresponding to the blocking performance can be easily realized.

  Also, by bending the main lever around the rotation axis toward the actuator, the displacement in the opening / closing axis direction due to rotation can be increased, so if the stroke length on the driven side is the same as before, the direction perpendicular to the opening / closing axis It becomes possible to reduce the width (width in the vertical direction).

  FIG. 12 is a diagram in which the horizontal axis represents the stroke of the drive-side arc electrode 4 and the vertical axis represents the speed ratio between the drive-side arc electrode 4 and the driven-side arc electrode 5. In this embodiment, when the driving side arc electrode 4 reaches the stroke s4ab, the driven side arc electrode 5 starts to move, and the driven side arc electrode 5 stops at s4ae.

  The driven-side arc electrode 5 is accelerated from s4ab to s4ac, and decelerated in two stages from s4ac to s4ad and from s4ad to s4ae. This is to rapidly accelerate the driven-side arc electrode 5 from the time b (see FIG. 4) when the driven-side arc electrode 5 exits the driving-side arc electrode 4, and to increase the distance between the electrodes in a short time.

  Such an operation is particularly effective for advancing and small current interruption. In advance small current interruption, it is necessary that the inter-layer dielectric breakdown voltage at each interruption time exceeds the recovery voltage. This is because the inter-electrode breakdown voltage depends on the inter-electrode distance at each time, so that it is necessary to increase the inter-electrode distance as much as possible in a short time.

  In this embodiment, the groove cam shape of the bidirectional drive mechanism that can realize the stroke characteristics necessary for leading small current interruption has been shown, but there are optimum stroke characteristics for various interruption duties, It is realizable by changing the shape of the connection part 16 comprised by these arbitrary curves.

DESCRIPTION OF SYMBOLS 1 ... Operating device 2 ... Drive side main electrode 3 ... Driven side main electrode 4 ... Drive side arc electrode 5 ... Driven side arc electrode 6 ... Shaft 7 ... Machine Compression chamber 8 ... nozzle 9 ... thermal expansion chamber 10 ... bidirectional drive mechanism 11 ... driving side connecting rod 12 ... main lever 13 ... driven side connecting rod 14 ... · Guide 15 ··· Main lever fixing pin 16 ··· First groove cam 16A · · First straight portion 16B · · Connection portion 16C · · Second straight portion 17 · · · Drive-side movable pin 18 · · · second Groove cam 19 ... Communication hole 20 ... Auxiliary lever 21 ... Auxiliary lever fixing pin 22 ... Driven side movable pin 23 ... Main lever driven side guide groove 24 ... Fastening ring 25 ..Drive-side fastening screw 26 ... Main lever fixing pin retaining ring 27 ... Drive-side movable pin hexagon head 28 · The drive side movable pin fastening screws 29 ... drive side movable pin fixing nut 30 ... auxiliary lever fixing pin snap ring 31 ... spacer

Claims (9)

In the sealed tank, a driving side electrode and a driven side electrode are provided facing each other, the driving side electrode has a driving side main electrode and a driving side arc electrode, and the driven side electrode is driven by the driven side main electrode and the driven side electrode. A side arc electrode, wherein the driving side arc electrode is connected to an operating device, and the driven side arc electrode is a gas circuit breaker connected to a bidirectional driving mechanism,
The bidirectional drive mechanism is configured to respond to an operation of a driving side connecting rod that receives a driving force from the driving side electrode, a driven side connecting rod connected to the driven side arc electrode, and the operation of the driving side connecting rod. A main lever 12 that moves the driven side connecting rod in the opposite direction, a guide 14 that defines the operation of the driving side connecting rod and the driven side connecting rod, and an auxiliary that is rotatably held by the guide 14 A lever 20;
The first groove cam 16 of the drive side connecting rod 11, the second groove cam 18 provided in the main lever 12, the communication hole 19 provided in the auxiliary lever 20, and the pin provided in the guide 14 A movable pin 17 is communicated with each of the communication portions 14C, and the movable pin 17 is moved in each of the groove cams by the operation of the driving side rod, thereby rotating the main lever 12 and the driven side. A connecting rod driven in a direction opposite to the driving side connecting rod, and the driven side arc electrode connected to the driven side connecting rod and the driving side arc electrode of the driving side electrode connected to the driving side connecting rod; Gas circuit breaker driven in the opposite direction. The first groove cam 16 includes a first straight portion 16C, a second straight portion 16A provided on a different axis with respect to the first straight portion, and a connecting portion 16B that connects the first straight portion and the second straight portion. Is composed of,
The gas circuit breaker according to claim 1. The main lever 12 is rotatably held on both sides of the guide 14 by a main lever fixing pin 15.
The auxiliary lever 20 is rotatably held on both sides of the guide 14 by an auxiliary lever fixing pin 21.
The gas circuit breaker according to claim 1 or 2. The operation angle formed by the main lever 12 from the start to the end of the opening / closing operation is substantially the same as a perpendicular to the opening / closing operation axis passing through the center point of the main lever fixing pin 15.
The gas circuit breaker according to claim 3. The center point of the movable pin 17 is located on the operating device side with respect to a perpendicular to the opening / closing operation axis passing through the center point of the main lever fixing pin 15 and is opened / closed through the center point of the main lever fixing pin 15. It is located on the lower side with respect to the shaft,
The gas circuit breaker according to claim 3 or 4. When the movable pin 17 moves in the first linear portion 16C and the second linear portion 16A, the main lever 12 is stationary,
When the movable pin 17 moves in the connecting portion 16B, the main lever 12 rotates around a fulcrum.
The gas circuit breaker according to claim 2. When the movable pin 17 moves in the connecting portion 16B, the movable pin 17 moves the second groove cam 18 in one direction.
The gas circuit breaker according to claim 2. In the opening operation, the movable pin 17 moves the second straight portion 16A, the connecting portion 16B, and the first straight portion 16C in one direction,
In the closing operation, the movable pin moves the first straight portion 16C, the connecting portion 16B, and the second straight portion 16A in one direction.
The gas circuit breaker according to claim 2. The positional relationship among the first straight portion 16C, the second straight portion 16A, the connecting portion 16B, and the second groove cam 18 of the first groove cam 16 is the speed of the driven side operation with respect to the drive side operation. It is characterized by a ratio,
The gas circuit breaker according to claim 2.