JP2012164542A - Gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas circuit breaker configured to improve reliability by distributing impact load exerted on members for driving a shutoff operation and a loading operation even for a both movable type in which a second movable contact is moved together with a first movable contact, in order to prevent concentration of impact force at any single location.SOLUTION: In the gas circuit breaker, a convex-shaped part having a curved surface shape protruding inward is disposed on a part of a driving rod 19. The convex-shaped part having the curved surface shape of the driving rod 19 is brought into contact with a part of a swing lever 13 and rotates the swing lever 13, thereby allowing a second movable electrode part 2 to be driven oppositely to a first movable electrode part 3. Additionally, the cross-section of one end of the swing lever 13 is formed in a substantially fan shape, and rotors (35, 37) separately brought into contact with the driving rod 19 by the loading operation and the shutoff operation are rotatably supported on a substantially fan-shaped part.

Description

  The present invention relates to a gas circuit breaker, and more particularly, to a gas circuit breaker suitable for high voltage power such as a power station substation or switching station.

  With the increase in capacity of power transmission systems, the breaking capacity of circuit breakers used in substations and switching stations has increased, and high reliability is required. In order to increase the reliability of the circuit breaker, it is important to reduce the number of parts and simplify the structure. Therefore, the number of circuit breaker parts is reduced.

  By the way, a puffer type gas circuit breaker is often used as a circuit breaker having a high breaking capacity. This puffer type gas circuit breaker has a structure in which gas is blown to an arc generated at the time of interruption to extinguish the arc, the structure of the interruption part is simple, and an enclosed insulating gas such as SF6 gas is used. It has excellent insulation and silencing performance.

  A general puffer-type gas circuit breaker includes an interrupter having SF6 gas sealed and having a fixed electrode and a movable electrode, and an operating device having a drive source for bringing the movable electrode into contact with and separating from the fixed electrode. It is roughly composed. In the blocking part, the movable electrode and the fixed electrode are provided to face each other, and are energized in a state where the movable electrode and the fixed electrode are in contact with each other. When an abnormal current flows to the power system due to lightning, for example, in this energized state, a break command is input to the circuit breaker, and the current is cut off by pulling the movable electrode away from the fixed electrode with the driving force of the controller. Is called.

  As one of means for improving the quenching performance in the puffer type gas circuit breaker as described above, there is a method of increasing the opening speed. However, in order to increase the opening speed in the above circuit breaker configuration, it is necessary to increase the driving force of the operating device, which increases the size of the entire device.

  On the other hand, a buffer that employs a dual drive system that increases the relative opening speed by moving the fixed electrode in the direction opposite to the moving direction of the movable electrode without changing the driving force of the operating device. There is a gas circuit breaker.

  This double-drive puffer-type gas circuit breaker is described in Patent Document 1, for example. In the puffer-type gas circuit breaker described in Patent Document 1, the first movable electrode and the second movable electrode opposed to the first movable electrode are coupled by a coupling rod and a fork-shaped lever, and when an interruption command is input, With this driving force, the first movable electrode is moved, and at the same time, the second movable electrode is intermittently moved in the direction opposite to the moving direction of the first movable electrode via the connecting rod and the fork-shaped lever. Yes.

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

  By the way, in the puffer-type gas circuit breaker described in Patent Document 1, an intermittent operation of the second movable electrode is realized by a single pin provided on the connecting rod contacting and separating from the fork-shaped lever. For this reason, there is a possibility that the impact load acts on the pin for both the shut-off and throw-in operations, and the reliability may be lowered due to the progress of wear of the pin due to many operations.

  In addition, at the connecting portion between the fork-shaped lever and the second movable electrode, the pin provided on the fork-shaped lever has a structure that moves in the vertical hole at the end of the second movable electrode, and the operation of shut-off and closing At the end, a contact load in the direction orthogonal to the electrode movement direction is generated. For this reason, the load in the direction perpendicular to the axis also acts on the guide and the bearing that support the second movable electrode, and there is a possibility that the wear of these parts progresses and the reliability decreases.

  Further, the fork portion of the fork-shaped lever has a substantially symmetrical shape with respect to the center line passing through the rotation axis of the lever, so that the moving speed when the second movable electrode contacts and separates from the first movable electrode However, there is a possibility that the impact when the electrodes collide in the closing operation becomes large.

  The present invention has been made in view of the above-described points, and an object of the present invention is to drive a shut-off operation and a closing operation even in a bi-movable system in which the second movable contact is moved together with the first movable contact. An object of the present invention is to provide a gas circuit breaker which improves the reliability by dispersing the impact load acting on the member so as not to concentrate the impact force in one place.

  In order to achieve the above object, a gas circuit breaker according to the present invention includes a container in which an insulating gas is sealed, and an insulating gas fixed in the tip of a puffer cylinder disposed in the container. A blocking portion for blocking current by spraying through the nozzle, a first movable electrode portion provided on the puffer cylinder side of the blocking portion, and a swing supported rotatably by the drive rod from the first movable electrode portion. In a gas circuit breaker that is connected via a moving lever and includes the first movable electrode part and the second movable electrode part that can be separated, a part of the drive rod is disposed on a side of the second movable electrode part. A projecting curved portion that protrudes, a cross-section of one end of the swing lever is formed in a substantially fan shape, and a rotating body that rotates the drive rod is supported by the substantially fan-shaped portion of the swing lever; The curved convex portion is in contact with the rotating body. To characterized in that to drive the second movable electrode portion by rotating the swing lever on the opposite side of the first movable electrode portion.

  By configuring in this way, the drive rod and the swing lever come into contact at different places when shutting off and when being turned on, so that the impact load acting on both members is dispersed and the impact force is not concentrated in one place. So reliability is improved.

  According to the present invention, in addition to the above configuration, the curved convex portion is a surface that contacts the rotating body of the swing lever in the closing operation, and a surface that contacts the rotating body of the swing lever in the blocking operation. It comprises at least two surfaces.

  Also with this configuration, the same effect as described above can be obtained, and the curved lever can be used to smoothly rotate the swing lever.

  In addition to the above-described configuration, the present invention is characterized in that the curved convex portion is formed separately from the drive rod, and both are connected by fastening means.

  With this configuration, when the convex portion of the drive rod is worn, it can be replaced, and the reliability is improved and the opening / closing pole time can be adjusted.

  Furthermore, the present invention is characterized in that, in addition to the above-described configuration, the driving rod is provided with a stopper surface for positioning the swing lever at the end of closing and at the end of opening of the blocking portion.

  With this configuration, when an external force due to an earthquake or other circuit breaker action is applied to the circuit breaker, the swinging lever is prevented from rotating counterclockwise, so that it can continue to maintain the circuit breaker state. effective.

  According to the present invention, even in the dual movable system in which the second movable contact is moved together with the first movable contact, the impact load acting on the member that drives the blocking operation and the closing operation is distributed, and the impact force is uniform. Since it does not concentrate on the location, a gas circuit breaker with improved reliability can be obtained.

It is an expanded sectional view of the interruption | blocking part in the injection state which shows one Example of the gas circuit breaker of this invention. It is an enlarged view which shows the operation part of the 2nd movable electrode and drive rod in the interruption | blocking state of the gas circuit breaker of FIG. It is an enlarged view which shows the operation part of the 2nd movable electrode and drive rod in the injection | throwing-in operation | movement initial stage of the gas circuit breaker of FIG. It is an enlarged view which shows the operation part of the 2nd movable electrode and drive rod in the injection | throwing-in operation | movement middle of the gas circuit breaker of FIG. It is an enlarged view which shows the operation part of the 2nd movable electrode and drive rod in the injection state of the gas circuit breaker of FIG. It is an enlarged view which shows the operation part of the 2nd movable electrode and drive rod in the interruption | blocking operation | movement initial stage of the gas circuit breaker of FIG. It is an enlarged view which shows the operation part of the 2nd movable electrode and drive rod in the middle of interruption | blocking operation | movement of the gas circuit breaker of FIG. It is the side view of the 2nd movable electrode seen from the arrow A of the gas circuit breaker of FIG.

  Hereinafter, an example of a power gas circuit breaker will be described with reference to FIGS. 1 to 8 as an embodiment of the gas circuit breaker of the present invention. In the following description, the same functional parts are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 shows an enlarged view of the breaker of the power gas circuit breaker. As shown in the figure, the breaker of the power gas circuit breaker of the present embodiment is roughly composed of a first movable electrode part 3 and a second movable electrode part 2. The first movable electrode portion 3 is formed of a puffer cylinder 15, a first arc movable contact 14, an insulating nozzle 16, and the like. The second movable electrode portion 2 is formed of a fixed energizing contact 11, a housing 12, a swing lever 13, a second arc movable contact 10, and the like.

  In the above description, the shut-off portion is housed in a tank (not shown), and an insulating gas such as SF6 gas is sealed in the tank at a specified pressure. Further, an insulating operation rod is connected to one end of the puffer cylinder 15 (not shown), and an operation mechanism (not shown) is connected to one end of the insulating operation rod.

  FIG. 1 shows a state in which the circuit breaker is turned on, and the tip 11a of the fixed energizing contact 11 and the tip 15a of the puffer cylinder 15 are in contact with each other. The tip 10a of the second arc movable contact 10 and the tip 14a of the first arc movable contact 14 are in contact with each other. When the tips of the contacts come into contact with each other, energization from a conductor (not shown) is maintained. When an abnormal current flows through the power system, a break command is input to the breaker, and the first arc movable contact 14 Is separated from the second arc movable contact 10 and the puffer cylinder 15 is separated from the fixed energizing contact 11, whereby the current is interrupted. After that, when a closing command is input to the circuit breaker, the contacts approach each other in the opposite manner, collide with each other, and return to the closing state of FIG.

  Next, the structure of the 2nd movable electrode part 2 is demonstrated. As shown in FIG. 1, one end of a drive rod 19 is connected to the vicinity 16 a of the tip of the insulating nozzle 16, and this drive rod 19 is supported in the operation axis direction by a concave groove 12 a (see FIG. 2) of the housing 12. It has a structure.

  FIG. 5 is an enlarged view of the drive rod 19, the swing lever 13, and the second arc movable contact 10 of FIG. 1. As shown in FIG. 5, a part of the drive rod 19 has a curved convex portion protruding inward so as to come into contact with a rocking lever 13 to be described later and to give the rocking lever 13 rotational movement. Is formed. The convex portion of the curved shape of the drive rod 19 is mainly a surface 19a that comes into contact with the feeding roller 37 provided on the swing lever 13 in the closing operation, and a blocking provided on the swing lever 13 mainly in the blocking operation. 5 is formed by three surfaces consisting of a surface 19b that contacts the roller 35 and a substantially flat portion 19d formed between them. In FIG. 5, the substantially flat surface 19d of the convex portion of the drive rod 19 is formed on the charging roller 37. The abutting state is shown. Since the convex portion of the drive rod 19 has a curved surface shape, there is an advantage that the blocking roller 35 and the charging roller 37 can be smoothly rotated.

  In the present embodiment, the convex portion of the drive rod 19 is a surface 19a that contacts the throwing roller 37 provided on the swing lever 13 in the closing operation, and the blocking portion provided in the swing lever 13 in the blocking operation. Although it is comprised by the three surfaces which consist of the surface 19b which contacts the roller 35, and the substantially flat part 19d formed between both, you may comprise by two surfaces without the substantially flat part 19d. Further, the convex portion of the curved shape of the drive rod 19 may be formed separately from the drive rod 19, and both may be connected by fastening means (bolts or the like).

  As shown in FIG. 5, the surface 19a of the convex portion that comes into contact with the charging roller 37 is composed of a curve having at least two curvatures, and the surface 19b of the convex portion that comes into contact with the blocking roller 35 is a drive rod. It is formed at an angle α1 with respect to a center line 41 perpendicular to the 19 operation axis directions. Furthermore, stopper surfaces 19c and 19e having a substantially right triangle shape for defining the rotation of the swing lever 13 are formed on the insulating nozzle 16 side from the front end portion and the convex portion of the drive rod 19, so that they are blocked. 2, when the closing roller 35 is in contact with the stopper surface 19e, as shown in FIG. 2, the closing roller 35 is in contact with the stopper surface 19e. The rotation of the swing lever 13 is defined.

  On the other hand, the swing lever 13 is rotatably supported on the rotating shaft 31, and the rotating shaft 31 is rotatably supported on the housing 12 as shown in FIG. 8. The swing lever 13 extends around the rotation shaft 31 in the arrangement direction of the drive rod 19 and the second arc movable contact 10, the drive rod 19 side is substantially fan-shaped, and the second arc movable contact 10 side is extended. The end is configured in a substantially circular shape. A pin 34 and a pin 36 are rotatably supported on the substantially fan-shaped end portion of the swing lever 13, and a blocking roller 35 and a charging roller 37 are rotatably mounted around the pins.

  If the pin 34 and the pin 36 have the same function as the blocking roller 35 and the loading roller 37, the pin 34 and the pin 36 themselves may be rotated. The pins 34 and 36 and the roller may be made of an insulating material.

  The second movable arc contact 10 is supported in the operation axis direction by a concave groove 12b formed in the housing 12, and a concave groove 10c is formed at the end of the second movable arc contact 10. Has been. The substantially circular end 13 a of the swing lever 13 is disposed so as to abut on the concave groove 10 c of the second movable arc contact 10. An end 10a of the second movable arc contact 10 including the concave groove 10c of the second movable arc contact 10 is connected to the rod-shaped portion 10b.

  Further, the housing 12 is provided with stopper pins 32 and 33. 1 and 5, the closing roller 37 supported by the swing lever 13 is substantially in contact with the stopper pin 33, so that the closing state of the breaker (for example, when the breaker is in an earthquake or other state) When receiving an external force such as a breaker operation), the swinging lever 13 cannot rotate counterclockwise because the closing roller 37 is in contact with the substantially flat surface 19d of the drive rod 19 and the stopper pin 33. Thus, the circuit breaker is kept in the on state. Further, in the closing state shown in FIG. 5, when the drive rod 19 advances to the left in the figure due to an external force, the engagement between the flat surface 19d of the driving rod 19 and the charging roller 37 is released, and the swinging motion Although the lever 13 is instantaneously free, the stopper surface 19e of the drive rod 19 and the blocking roller 34 are in contact with each other, whereby the clockwise rotation of the swing lever 13 is suppressed, and the second arc contactor 10 is It is possible to prevent separation from the arc contactor 14.

  By the way, when the circuit breaker is turned on, the main electric circuit is from the fixed energizing contact 11 to the puffer cylinder 15 as described above, but the first arc movable contact 14 and the second arc movable contact 10 are in contact with each other. Therefore, a parallel electric path from the second arc movable contact 10 to the drive rod 19 and the insulating nozzle 16 via the swing lever 13 is about to be formed. The tip 10a of the second arc movable contact 10 is made of a material that can withstand arc heat at the time of interrupting the current, but the drive rod 19 does not have a current-carrying capacity.

  Therefore, at least one of the end portion 10a including the concave groove 10c of the second arc movable contact 10 or the throwing roller 37 supported by the swing lever 13 or the convex portion of the drive rod 19 is made of an insulating material. It is good to configure. For example, when the convex portion of the drive rod 19 is an insulating material, the rod-shaped portion and the convex portion may be fixed by bolt fastening or the like. Further, when the end portion 10a of the second arc movable contactor 10 is made of an insulating material, a screw portion is provided at the end portion of the end portion 10a and the end portion of the rod-like portion 10b, and both are fixed by screw fastening. good.

  By configuring as described above, in a state where the circuit breaker is turned on, a parallel electric path from the second arc movable contact 10 to the drive rod 19 via the swing lever 13 is not formed, and the drive rod 19 is energized by energization. Damage can be avoided.

  The shut-off operation of the gas circuit breaker of the present embodiment configured as described above will be described below with reference to FIGS. 5 to 7 and FIGS. 1 and 2.

  FIG. 5 shows the circuit breaker in the inserted state, FIG. 6 shows the initial state of the breaking operation, FIG. 7 shows the state during the breaking operation, and FIG. 2 shows the breaking operation end state.

  First, in FIG. 5, when an operation mechanism (not shown) is operated when the gas circuit breaker receives a shut-off command, the puffer cylinder 15 shown in FIG. 1 is driven to move away from the fixed energizing contact 11. At this time, the drive rod 19 connected to the insulating nozzle 16 is also driven, and in FIG. 5, the drive rod 19 starts to move in the right direction in the drawing by the blocking operation. As a result, the substantially flat surface 19 d of the drive rod 19 is separated from the charging roller 37.

  Further, when the drive rod 19 moves in the right direction, the convex portion of the drive rod 19 contacts the blocking roller 35 as shown in FIG. Due to the contact force at this time, the swing lever 13 starts to rotate clockwise. Then, the end 13a of the swing lever 13 presses the concave groove 10c of the second arc movable contact 10 to move the second arc movable contact 10 leftward in FIG. Thereby, the other end 10 a of the second arc movable contact 10 shown in FIG. 1 is separated from the end portion 14 a of the first arc movable contact 14.

  Thus, the second arc movable contact 10 is driven in the direction opposite to the moving direction of the first arc movable contact 14, and the breaking speed between the electrodes is interrupted by driving only the first arc movable contact 14. The current interrupting performance is improved. When the drive rod 19 moves, the blocking roller 35 comes into contact with the substantially flat surface 19d of the drive rod 19 and the stopper pin 32 as shown in FIG. Further, when the drive rod 19 moves to the right in FIG. 7, the convex portion of the drive rod 19 and the blocking roller 35 are completely separated. The final blocking state is shown in FIG. 2, where the stopper surface 19 c of the drive rod 19 is substantially in contact with the loading roller 37 and the blocking roller 35 is in contact with the stopper pin 32.

  In this state, when an external force due to an earthquake or other circuit breaker action is applied to the circuit breaker, the swing lever 13 is rotated clockwise to the stopper pin 32 and counterclockwise to the stopper surface 19c of the drive rod 19. Since the rotation is suppressed, the cut-off state can be kept.

  During the shut-off operation, the contact load direction between the end 13a of the swing lever 13 and the concave groove 10c of the second arc movable contact 10 substantially coincides with the operation axis direction of the second arc movable contact 10. The bending load acting on the second arc movable contact 10 is small, and the reliability of the recessed groove 12b of the housing 12 and the slide bearing of the second arc movable contact 10 (not shown) can be improved.

  Next, the closing operation of the gas circuit breaker will be described below with reference to FIGS.

  FIG. 2 shows a circuit breaker breaking state, FIG. 3 shows an initial state of the closing operation, FIG. 4 shows a state during the closing operation, and FIG. 5 shows a closing operation end state.

  In FIG. 2, when an operation mechanism (not shown) is operated when the gas circuit breaker receives a closing command, the drive rod 19 starts to move in the left direction in the figure. As a result, the stopper surface 19c of the drive rod 19 is separated from the charging roller 37 and is in the intermediate state shown in FIG. At this time, the convex portion of the drive rod 19 is approaching the charging roller 37.

  Further, when the drive rod 19 moves in the left direction, as shown in FIG. 4, the convex portion of the drive rod 19 comes into contact with the feeding roller 37 and rotates the swing lever 13 counterclockwise. Then, the end 13a of the swing lever 13 presses the concave groove 10c of the second arc movable contact 10 and moves the second arc movable contact 10 in the right direction in FIG.

  Thereby, the other end 10 a of the second arc movable contact 10 shown in FIG. 1 approaches the end portion 14 a of the first arc movable contact 14. Further, when the drive rod 19 moves leftward, the closing operation end state shown in FIG. 5 is reached, and the substantially flat surface 19 d of the convex portion of the drive rod 19 contacts the charging roller 37.

  As shown in FIG. 5, the surface 19a of the convex portion of the drive rod 19 in contact with the charging roller 37 is composed of a curve having at least two curvatures R1 and R2. This curvature is preferably R2> R1.

  With this configuration, when the second arc movable contactor 10 comes into contact with the first arc movable contactor 14 in the latter half of the charging operation, the charging roller 37 and the convex charging roller 37 Since the R2 portion of the contact surface 19a comes into contact with each other, the operation speed of the contact can be suppressed, so that the impact when the contact is inserted can be reduced and the reliability of the contact can be improved. However, since the contactor that has already been put in is only pulled out during the blocking operation, it may be configured as a substantially straight line with an infinite curvature of the surface 19b in contact with the blocking roller 35.

  When the closing operation is completed, the gas circuit breaker returns to the energized state, and when the next interruption command is input, the interruption operation is performed as described above.

  In this embodiment, the surface of the drive rod 19 that comes into contact with the rocking lever 13 in the cutting operation of the curved convex portion and the surface that comes into contact with the rocking lever 13 in the closing operation move the drive rod 19. It may be asymmetric with respect to a virtual line perpendicular to the direction.

  Further, it has a housing that rotatably supports the drive rod 19 and the operation guide of the second movable electrode portion 2 and the swing lever 13, and the swing lever 13 can be supported in a cantilever manner on this housing. Is possible.

  By doing so, it is possible to reduce the number of parts compared to the case of supporting in a double-sided manner, and the internal inspection is facilitated.

  Further, there may be an idle running section that does not contact the rocking lever 13 before and after the drive rod 19 rotates the rocking lever 13 during the blocking operation and the closing operation. Compared with the case where no idle running section is provided, it is possible to reduce the driving load at the time of initial operation of the operating device.

  As described above, according to the present embodiment, when the swing lever 13 is driven by the drive rod 19 in the double-movable puffer type gas circuit breaker, the separate portions are brought into contact with each other by the shut-off operation and the closing operation. Therefore, the reliability of the circuit breaker can be improved as compared with the conventional method.

  2 ... 2nd movable electrode part, 3 ... 1st movable electrode part, 10 ... 2nd movable arc contactor, 10a ... End part of 2nd movable arc contactor, 10b ... Rod-shaped part of 2nd movable arc contactor, 10c DESCRIPTION OF SYMBOLS ... Concave groove of 2nd movable arc contact, 11 ... Fixed electricity supply contact, 12 ... Housing, 13 ... Swing lever, 13a ... Substantially circular end part of rocking lever, 14 ... 1st movable arc contact, 15 ... Puffer cylinder, 16 ... Insulating nozzle, 19 ... Drive rod, 31 ... Rotating shaft, 32,33 ... Stopper pin, 34,36 ... Pin, 35 ... Blocking roller, 37 ... Loading roller.

Claims (4)

A container in which an insulating gas is sealed, and a blocking unit that blocks the current by blowing the insulating gas in the container through an insulating nozzle fixed to the tip of a puffer cylinder disposed in the container; and The first movable electrode portion provided on the puffer cylinder side of the shut-off portion is coupled to the first movable electrode portion via a swing lever that is rotatably supported by the drive rod from the first movable electrode portion. In the gas circuit breaker comprising the second movable electrode part that can be separated,
A curved convex portion projecting toward the second movable electrode portion is provided on a part of the drive rod, and a cross section of one end of the swing lever is formed in a substantially fan shape to rotate the drive rod. A rotating body is supported by a substantially fan-shaped portion of the swing lever, and the convex portion having the curved shape comes into contact with the rotating body to rotate the swing lever, thereby moving the second movable electrode portion to the first. 1 A gas circuit breaker which is driven to the opposite side to the movable electrode portion. The gas circuit breaker according to claim 1,
The curved convex portion is composed of at least two surfaces: a surface that contacts the rotating body of the swing lever in the closing operation, and a surface that contacts the rotating body of the swing lever in the shut-off operation. A gas circuit breaker. In the gas circuit breaker according to claim 1,
The curved circuit-shaped convex portion is formed separately from the drive rod, and both of them are connected by fastening means. The gas circuit breaker according to claim 1,
A gas circuit breaker characterized in that the driving rod is provided with a stopper surface for positioning the rocking lever at the time of closing and opening of the blocking portion.

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