JP2012028106A - Twin drive type gas circuit breaker - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a puffer type gas circuit breaker, employing a twin drive system, that has a simple mechanism and saves the space.SOLUTION: The puffer type gas circuit breaker employing the twin drive system includes a container filled with insulation gas, a puffer cylinder 15 and a puffer piston 17 arranged in the container, a pressure generation part having a gas spraying insulation nozzle 16 fixed to a tip of the puffer cylinder 15, a first movable electrode provided on the side of the puffer cylinder 15, and a second movable electrode part 2 which is coupled through the first movable electrode part 3 and a connecting rod 19, and can be open with the first movable electrode part, and drives the second movable electrode part 2 simultaneously with respect to operations of the pressure generation part and first movable electrode part to spray the insulation gas of the pressure generation part on an arc as the first movable electrode part 3 and second movable electrode part 2 become open.

Description

  The present invention relates to a high voltage specification twin-drive power gas circuit breaker such as a substation or a switch in a power system.

  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. 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 breaking points of the circuit breaker is reduced. Therefore, it is necessary to increase the breaking capacity per point of the circuit breaker. A puffer type gas circuit breaker is often used as a circuit breaker with a high breaking capacity. The puffer-type gas circuit breaker has a structure in which gas is blown into the arc generated at the time of interruption to extinguish it. In addition to the simple structure of the blocking portion, it has excellent insulation and quenching performance with an enclosed insulating gas such as SF6 gas.

  A typical puffer-type gas circuit breaker includes an interrupter tank containing an insulating gas, for example, SF6 gas, having a fixed electrode part and a movable electrode part, and a movable electrode part as a fixed electrode part. It is comprised with the operation device which has a drive source for making it contact and open | release. In the shut-off portion tank, the movable electrode portion and the fixed electrode portion are provided to face each other, and the inside of the shut-off portion tank is energized while the movable electrode portion and the fixed electrode portion are in contact with each other. In such a state, when an abnormal current flows due to lightning or the like, a break command is input to the circuit breaker, and the current is cut off by pulling the movable electrode portion away from the fixed electrode portion with the driving force of the operating device.

  By the way, as one of the 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. In the above configuration, in order to increase the opening speed. , The driving force of the operating device must be increased, which increases the size of the entire device and increases the cost. On the other hand, there is a dual drive system that increases the relative opening speed by moving the fixed electrode portion in the direction opposite to the moving direction of the movable electrode portion without changing the driving force of the operating device. .

  The double drive type puffer type gas circuit breaker is described in Patent Documents 1, 2, and 3, for example. In the circuit breaker described in Patent Document 1, the first movable electrode portion and the second movable electrode portion opposed to the first movable electrode portion are connected by an insulating rod and a link mechanism. With the driving force, the first movable electrode portion is moved, and at the same time, the second movable electrode portion is moved in the direction opposite to the moving direction of the first movable electrode portion via the insulating rod and the link mechanism.

JP-A-2-162629 JP 2004-119315 A USP 6271494 specification

  By the way, since the link mechanism that connects the first movable electrode part and the second movable electrode part of the double drive circuit breaker described in Patent Document 1 is composed of at least six parts, the structure becomes complicated, There is a risk of damaging the reliability of the circuit breaker. In addition, since the connecting point between the insulating rod and the first movable electrode section is provided on the connecting rod, the position of the insulating rod is outside the puffer cylinder, the diameter of the shield can be expanded, and the cutoff tank can be enlarged. There is sex.

  In addition, in order to prevent the insulating rod connecting the first movable electrode part and the second movable electrode part from being thermally deteriorated by the hot gas generated at the time of extinction, the periphery of the insulating rod is protected by an insulating cylinder. Therefore, there is a possibility that the shield diameter will be expanded and the blocking tank will be enlarged.

  In patent document 2, the gas circuit breaker provided with the several finger contact member which formed the opposing contact and the opposing sliding contact integrally in the double drive type gas circuit breaker is disclosed. In this gas circuit breaker, since the electrode support is connected to the tip of the insulating nozzle through the link mechanism, the connecting rod, and the connection ring, the compressive strength is too high as in the circuit breaker described in Patent Document 3. There is no concern that the insulating nozzle will be damaged.

  In addition, the double drive circuit breaker described in Patent Document 3 connects a connecting rod that connects the first movable electrode part and the second movable electrode part and an insulating nozzle on the first movable electrode part side via a ring. As a result, local contact stress is generated, and the connecting part of the insulating nozzle may deteriorate.

  The object of the present invention is to connect the first movable electrode portion and the second movable electrode portion by a method having sufficient strength, thereby preventing the insulation nozzle from being damaged and suppressing an increase in radial dimension. It is possible to reduce the size, and furthermore, by connecting the first movable electrode portion and the second movable electrode portion with a simple structure, the number of parts can be reduced, and further, the thermal deterioration of the insulating rod can be reduced. The structure to prevent is to provide a reliable and small twin-drive gas circuit breaker. Another object of the present invention is to improve the strength of the insulating nozzle and simplify the connection structure of the connecting rod.

The present invention includes a container filled with an insulating gas,
A pressure generating unit having a puffer cylinder and a puffer piston disposed in the container, and having a gas blowing insulating nozzle fixed to the tip of the puffer cylinder;
A first movable electrode portion provided on the puffer cylinder side;
A second movable electrode portion connected to the first movable electrode portion via a connecting rod and separable from the first movable electrode portion;
The second movable electrode unit is simultaneously driven in relation to the operation of the pressure generating unit and the first movable electrode unit, and the arc is generated with the opening of the first movable electrode unit and the second movable contact unit. A double-drive puffer-type gas circuit breaker that blows the insulating gas of the pressure generating unit,
A double-drive gas characterized in that a connecting rod is connected to the vicinity of a base portion of the insulating nozzle of an attachment portion of the insulating nozzle to the puffer cylinder to connect the first movable electrode portion and the second movable electrode portion. A circuit breaker is provided.

  According to the present invention, by connecting the first movable electrode portion and the second movable electrode portion by a method having sufficient strength, the insulation nozzle is prevented from being damaged, and the increase in the radial dimension is suppressed. It is possible to reduce the size, and furthermore, it is possible to realize a connection method between the first movable electrode portion and the second movable electrode portion with a simple structure. In addition, by reducing the number of components and further preventing the thermal deterioration of the insulating rod, it is possible to provide a reliable and small double-drive gas circuit breaker.

1 is a cross-sectional view of a power dual-drive gas circuit breaker according to an embodiment of the present invention. FIG. 2 is a cross-sectional view of the extinguishing chamber in the charged state of the twin-drive gas circuit breaker of FIG. 1. FIG. 2 is a cross-sectional view of the extinguishing chamber in the middle of shutting off of the twin-drive gas circuit breaker of FIG. 1. FIG. 2 is a cross-sectional view of the extinguishing chamber in the middle of shutting off the twin-drive gas circuit breaker of FIG. 1. Sectional drawing of the extinction chamber in the middle of interruption | blocking of the double drive type gas circuit breaker by another Example. Sectional drawing of the extinction chamber in the middle of interruption | blocking of the double drive type gas circuit breaker by other Example. Sectional drawing along the A-A 'line by the side of the 1st movable electrode part 2 of the extinction chamber of the double drive type gas circuit breaker shown in FIG. The block diagram of the connecting rod of the double drive type gas circuit breaker shown in FIG. Sectional drawing of the extinction chamber in the middle of the interruption | blocking by the other Example of a double drive type gas circuit breaker. Sectional drawing of the extinction chamber in the interruption | blocking state of further another Example of a double drive type gas circuit breaker. Sectional drawing of the extinction chamber in the interruption | blocking state of further another Example of a double drive type gas circuit breaker. Sectional drawing of the insulation nozzle along the B-B 'line | wire of the twin drive type gas circuit breaker shown in FIG. The perspective view of the insulation nozzle of the twin drive type gas circuit breaker shown in FIG. The expanded sectional view of the fastening part of the insulation nozzle and connecting rod of the double drive type gas circuit breaker shown in FIG.

  According to the embodiment of the puffer-type gas circuit breaker of the present invention, in the connection between the first movable electrode portion and the second movable electrode portion, the first movable electrode portion is connected at the outer peripheral portion of the insulating nozzle, The number of link parts used can be reduced as much as possible, most preferably one. Moreover, it is preferable that the connecting rod is configured such that at least a portion to which the hot gas generated at the time of extinction is sprayed is made of a material having excellent heat resistance, and the insulating nozzle and the connecting rod are directly connected. That is, the first movable electrode portion and the second movable electrode portion are connected to the outer peripheral portion of the insulating nozzle of the first movable electrode portion, in particular, the attachment portion of the insulating nozzle, that is, the root portion or the vicinity thereof with respect to the second movable electrode portion. . As a result, a mechanism for connecting them can be provided inside the puffer cylinder, so that space can be saved. As a result, the same diameter as the shield of the conventional puffer type gas circuit breaker with one of the electrodes fixed. Shield can be used.

  Further, if one link part is used for connecting the first movable electrode part and the second movable electrode part, the number of parts can be reduced and the reliability of the circuit breaker can be improved. In addition, as a connecting rod for connecting the first movable electrode part and the second movable electrode part, a rod having improved insulation between the electrodes where insulation is required and heat resistance at a location where hot gas is blown is provided. If used, it is possible to prevent deterioration of the connecting rod due to hot gas. As a result, there is no need for a covering structure for preventing thermal deterioration of the connecting rod, and it becomes possible to save space in the shutoff tank. Further, by directly connecting the connecting rod and the insulating nozzle, it is possible to prevent the generation of local stress at the connecting portion of the insulating nozzle, and it is possible to prevent the insulating nozzle from deteriorating.

  Hereinafter, embodiments of the present invention will be specifically described.

(1) a container filled with an insulating gas;
A pressure generating unit having a puffer cylinder and a puffer piston disposed in the container, and having a gas blowing insulating nozzle fixed to the tip of the puffer cylinder;
A first movable electrode portion provided on the puffer cylinder side;
A second movable electrode portion connected to the first movable electrode portion via a connecting rod and separable from the first movable electrode portion;
In conjunction with the operation of the pressure generating unit and the first movable electrode unit, the second movable electrode unit is driven at the same time, and the first movable electrode unit and the second movable electrode unit are separated from each other and the pressure is applied to the arc. A double-drive puffer-type gas circuit breaker that blows the insulating gas of the generator,
A double-drive gas characterized in that a connecting rod is connected to the vicinity of a base portion of the insulating nozzle of an attachment portion of the insulating nozzle to the puffer cylinder to connect the first movable electrode portion and the second movable electrode portion. Circuit breaker. In this gas circuit breaker, as shown in FIG. 13, by fixing the connecting rod directly to the root of the insulating nozzle, particularly the portion where the cross-sectional area increases, the most stable connection is possible, the number of parts is reduced and the cost is reduced. it can. However, the object of the present invention can be achieved by connecting through other members.

  (2) In the above-described double drive type gas circuit breaker, the connecting rod is a part of the first movable member that is required to have a heat-resistant material and an insulating property at a portion to which the insulating gas hits after the arc is blown. The dual drive type gas circuit breaker characterized in that the portion located between the electrode portion and the second movable electrode portion is a combination of materials having excellent insulating properties. By configuring the connecting member with a plurality of members, an excellent connecting rod can be configured. However, from the viewpoint of reducing the number of parts and reducing the cost, it is better to form the connecting rod with one member.

  (3) In the dual drive type gas circuit breaker, the double movable gas circuit breaker is characterized in that the connecting portion between the second movable electrode portion and the connecting rod is rotatably supported by a connecting lever. By comprising in this way, a contactor can be driven, without increasing the dimension of the radial direction of a 2nd movable electrode part. Note that the number of connecting levers is not limited to one as shown in the figure, but may be composed of a plurality of members as shown in Patent Documents 2 and 3.

  (4) In the dual drive type gas circuit breaker, the connecting rod is made of fiber reinforced plastic, and a portion to which the insulating gas hits after the arc is blown is excellent in heat resistance, and the first movable electrode unit and the A double drive type gas circuit breaker characterized in that the type of reinforcing fiber is adjusted so as to give a property excellent in insulation to a portion located between the second movable electrode portions. This configuration considers the characteristics of the gas circuit breaker and can provide an optimal connecting rod.

  (5) In the dual drive type gas circuit breaker, the connecting rod is formed by connecting a plurality of types of members.

  (6) A dual drive type gas circuit breaker having a structure in which the connecting rod and the outer peripheral portion of the insulating nozzle are directly connected to each other. As shown in Patent Document 3, in the present invention, the connecting rod and the insulating nozzle may be connected via another member within the scope of the object of the invention.

  (7) In the above-described dual drive type gas circuit breaker, the double drive type gas circuit breaker is characterized in that the connecting portion between the connecting rod and the insulating nozzle is provided at a location where the second-order coefficient of the cross section of the insulating nozzle is perpendicular to the axial direction. Circuit breaker. This configuration relates to a structure in which the insulating nozzle can withstand the impact force of the operation of the movable contact portion, and particularly preferably, the insulating nozzle is connected at a position where the second-order coefficient of the cross section is the maximum or closest thereto.

  (8) In the dual drive type gas circuit breaker, the double drive type gas circuit breaker is characterized in that the connecting portion of the connecting rod and the insulating nozzle is provided at a position where the diameter of the insulating nozzle increases abruptly or at a position closest thereto. vessel.

(9) a container filled with an insulating gas;
A pressure generating unit having a puffer cylinder and a puffer piston disposed in the container, and having a gas blowing insulating nozzle fixed to the tip of the puffer cylinder;
A first movable electrode portion provided on the puffer cylinder side;
A second movable electrode portion connected to the first movable electrode portion via a connecting rod and separable from the first movable electrode portion;
The second movable electrode unit is simultaneously driven in relation to the operation of the pressure generating unit and the first movable electrode unit, and the arc is generated with the opening of the first movable electrode unit and the second movable electrode unit. A double-drive puffer-type gas circuit breaker that blows the insulating gas of the pressure generating unit,
A reinforcing portion is formed at a specific portion from the tip portion to the root portion of the insulating nozzle, the connecting rod is connected to the tip portion of the insulating nozzle, and the first movable electrode portion and the second movable electrode portion are connected. Double drive type gas circuit breaker. In this configuration, the connection between the connecting rod and the insulating nozzle is simplified, the length of the connecting rod can be made as short as possible, and the stress applied to the connecting rod is reduced.

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

  In the present invention, the first movable electrode portion 3 means a configuration including a puffer cylinder 15 surrounded by the shield 4, a first arc movable contact portion 14, a puffer piston 17, a puffer cylinder 15, an insulating nozzle 16, and the like. Moreover, in this invention, the 2nd movable electrode part 2 points out the structure containing the fixed electricity supply contact 11, the guide 12, the movable arc contact 10, etc. which were enclosed by the shield 4, as shown in FIG.

  In the present specification, the connecting rod 19 has various configurations, and includes a single member as shown in FIGS. 1 to 4, and drives the first movable electrode portion 3 and the second movable electrode portion 2. It is desirable to use a material having mechanical strength that can withstand electrical resistance, electrical insulation, heat resistance, and arc resistance.

  In the example shown in FIG. 5, the connecting rod 19 is a member 19 (d) made of a material having excellent heat resistance, a member 19 (e) made of a material having excellent mechanical strength, and a member made of a material having excellent insulating properties. 19 (c) is composed of three connected members.

  In FIG. 6, as shown in FIG. 8, a portion 19 (h) containing a material having excellent heat resistance, a portion 19 (g) containing a material having excellent insulating properties, and a portion 19 (i) in which they are mixed. The structure of the connecting rod 19 is shown. In this case, as will be described later, it is preferable to use a fiber reinforced plastic.

  In FIG. 9, the structure of the connection rod 19 which connected the part 19 (a) which consists of metal materials, and the connection rod 19 (b) of a glass fiber reinforced plastic is shown.

  In the present invention, the connecting rod 19 is preferably fixed to the fixing portion of the insulating nozzle 16, that is, the base portion of the insulating nozzle or the vicinity thereof, particularly the thick portion. 1 to 6 and 9, all the connecting rods are connected in the vicinity of the fixing portion of the insulating nozzle to the puffer cylinder. FIG. 13 specifically shows the connection structure of the insulating nozzle and the connecting rod. By forming a threaded portion 27 at one end of the connecting rod and inserting the threaded portion 27 into a screw hole provided at the base of the insulating nozzle 16, the connecting rod can be directly fixed to the insulating nozzle. With this configuration, even when stress is applied to the insulating nozzle when the movable electrode unit is driven, a large impact force is not applied to the thin portion of the insulating nozzle itself, thereby eliminating the problem of damaging the insulating nozzle. be able to. On the other hand, in the configurations described in Patent Documents 2 and 3, since the connecting rod is connected to the tip of the insulating nozzle, the insulating nozzle may be damaged by the impact force when driving the movable electrode portion. .

  In the embodiment shown in FIGS. 10 and 11, the connecting rod is connected to the tip of the insulating nozzle. However, the thickness of a part of the insulating nozzle of the portion to which the connecting rod is connected is increased so that the movable electrode portion is connected. The insulating nozzle is configured not to be damaged even when stress is applied during driving. 12A is a cross-sectional view of the insulating nozzle shown in FIG. 11, and FIG. 12B is a perspective view. A reinforcing portion 24 is provided in the longitudinal direction of the insulating nozzle 16 above the insulating nozzle 16. A connecting hole 25 for the connecting rod 19 is formed at the tip of the reinforcing portion 24. The space 26 is a gas outlet of the insulating nozzle. By comprising in this way, the mechanical strength of an insulated nozzle can be improved, without increasing the dimension and weight of the whole insulated nozzle as much as possible. However, since increasing the thickness of the insulating nozzle increases the weight of the insulating nozzle, it is preferable to limit the reinforcing portion to a limited portion as much as possible. Accordingly, in the case of FIG. 10 as well, the thickness of the entire insulating nozzle is not increased, but the portions requiring reinforcement, that is, the portion to which the connecting rod is connected and the shape balance (see FIG. 11, 12A, 12B). In order to achieve strength balance, it is preferable to form reinforcing portions only in a portion to which the connecting rod is connected and a target portion. The specific part from the tip portion to the root portion of the insulating nozzle is to provide a reinforcing portion only at a part, not the entire circumference of the insulating nozzle. Moreover, in order to avoid an increase in weight as much as possible, shapes such as a line shape and a dot shape are conceivable.

  In the present invention, it is desirable that the connecting rod connection method is designed so as not to increase the radial dimension of the first movable electrode portion 3 and the second movable electrode portion 2. That is, in FIGS. 1 to 6 and 9, the radial dimension of the first movable electrode portion 3 and the second movable electrode portion 2 is not increased by connecting to the increased diameter portion of the base portion of the insulating nozzle. Designed. In the case of FIGS. 10 and 11, the size of the insulating nozzle in the radial direction is slightly increased, but it is desirable to design the degree as small as possible.

  FIG. 1 shows the structure of a double drive type puffer type gas circuit breaker according to one embodiment of the present invention. In FIG. 1, a first movable electrode portion 3 and a second movable electrode portion 2 are provided in the blocking portion tank 1 so as to face each other, and surround the outside of the first movable electrode portion 3 and the second movable electrode portion 2. A shield 4 is provided as described above. Conductors 6 and 5 are connected to the first movable electrode portion 3 and the second movable electrode portion 2, respectively, and the first movable electrode portion 3 is connected to the drive mechanism 7 via an insulating operation rod 24. The conductors 6 (a) and 5 (a) are attached to the blocking portion tank 1 via supporting insulating cylinders 9 and 8, respectively. The shut-off unit tank 1 is installed on a gantry (not shown), and an insulating gas, for example, SF6 gas is sealed in the shut-off unit tank 1 at a specified pressure.

  Next, the details of the extinguishing chamber of the double drive type puffer type gas circuit breaker will be described with reference to FIG. This figure shows the input state. In FIG. 2, the first movable electrode portion 3 includes a puffer piston 17 fixed to the shut-off portion tank 1 via the conductor 6 and the support insulating cylinder 9, a puffer cylinder 15 that slides along the puffer piston 17, In order to connect the puffer cylinder 15, the drive mechanism 7, and the insulating operation rod 24, an operation rod 18 inserted into a puffer piston 17 is provided. Further, a first movable arc contact 14 and an insulating nozzle 16 surrounding the first movable arc contact 14 are provided at the tip of the puffer cylinder 15. On the other hand, the second movable electrode portion 2 includes a central second movable arc contact 10 and a cylindrical fixed energization contact 11 provided outside thereof, and is configured to be hollow.

  The fixed energizing contact 11 is fixed to the shutoff tank 1 via the conductor 5 and the supporting insulating cylinder 8, and the fixed energizing contact tip 11 (a) and the puffer cylinder outer periphery tip 15 (a) are in the charged state. In contact. The second movable arc contact 10 is in contact with the first movable arc contact 14 in the put-in state, and is a connecting lever 13 rotatably supported by a guide 12 provided on the fixed energized contact 11 fixed in position. It is connected to the insulating nozzle 16 via the connecting rod 19 and is driven in the opposite direction to the operation of the first movable arc contact. The guide 12 is provided with a first guide rail 12 (a) and a second guide rail 12 (b), and the connecting rod 19 and the second movable arc contact 10 are structured to slide in the direction of the operation axis, respectively. ing. As shown in FIG. 9, the connecting rod 19 includes a heat-resistant rod 19 (b) excellent in heat resistance on the second movable electrode portion side, and an insulating rod 19 (a) excellent in insulation on the first movable electrode portion side. It consists of and. Further, the connecting rod 19 and the insulating nozzle 16 are directly fastened, for example, by providing thread grooves on both.

  The shut-off operation of the extinguishing room configured as described above will be described with reference to FIGS. 2 shows a closing state, FIG. 3 shows a state in the middle of a shut-off operation, and FIG. 4 shows a state in the middle of a shut-off. In FIG. 2, when the drive mechanism 7 shown in FIG. 1 is operated in response to the shut-off command, the puffer cylinder 15, the first movable arc contact 14, the insulating nozzle 16 connected via the insulating operation rod 24 and the operation rod 18. Moves to the right in the figure. At the same time, the second movable arc contact 10 is driven in the opposite direction to the first movable arc contact 14 via the connecting rod 19 and the connecting lever 13 connected to the insulating nozzle 16. At this time, in FIG. 3, the connecting rod 19 and the second movable arc contact 10 are driven along the first guide rail 12 (a) and the second guide rail 12 (b), respectively. Further, along with these operations, the insulating gas in the puffer chamber 20 is compressed in FIG. This insulating gas is guided by the insulating nozzle 16 and the puffer cylinder 15 and blown to the arc 21 generated by the separation of the first movable arc contact 14 and the second movable arc contact 10. By this blowing, the arc 21 disappears and the circuit is interrupted.

  In FIG. 4, the insulating gas that contributes to extinction of the arc 21 is released into the space 22 in a state of being heated to a high temperature in the course of being interrupted. At this time, for example, a nickel-based alloy connecting rod having excellent heat resistance can be used as the connecting rod 19 in a portion that is directly exposed to the insulating high-temperature gas flow 23 that contributes to the extinction of the arc 21. For example, a glass fiber reinforced plastic connecting rod 19 (a) excellent in insulation is used between the fixed energized contact tip 11 (a) and the puffer cylinder outer periphery tip 15 (a), which require insulation. It has been.

  FIG. 5 shows still another embodiment of the present invention. In this embodiment, with respect to the connecting rod 19, an insulating rod 19 (excellent in insulation) is provided between the fixed energizing contact tip 11 (a) and the puffer cylinder outer peripheral tip 15 (a), which are required to have insulation. Where c) is used, the heat-resistant rod 19 (d) having excellent heat resistance is used at the locations directly exposed to the gas flow 23, and the steel rod 19 having excellent rigidity and strength is used at other locations. (E) is used. In this embodiment, the rigidity and strength of the connecting rod 19 are increased by using the heat-resistant rod 19 (d) and the insulating rod 19 (c) only for the places where heat resistance and insulation are required. It is a thing.

  FIG. 6 shows still another embodiment of the present invention. In this embodiment, for the connecting rod 19, for example, in a fiber reinforced plastic connecting rod 19 (f) using a resin as a base material, the fiber material is changed with respect to the longitudinal direction of the connecting rod. For each location where high performance is required, aramid short fibers excellent in heat resistance and short glass fibers excellent in insulation are blended.

  FIG. 7 is a cross-sectional view taken along the line AA ′ of FIG. 1. The guide 12, the second movable arc contact 10, and the connection rod 19 are arranged with the connection lever 13 interposed therebetween. 11 is fixed.

  As described above, according to the present invention, in the double drive type puffer type gas circuit breaker, the outer peripheral portion of the insulating nozzle 16 of the first movable electrode portion 3 and the second movable electrode portion 2 are connected to the connecting lever 7 as a simple mechanism. By using the connecting rod 19 having excellent heat resistance and insulation, the circuit breaker can be improved in reliability and downsized.

1: Blocking tank, 2: Second movable electrode unit, 3: First movable electrode unit, 7: Drive mechanism, 10: Second movable arc contact, 11: Fixed energizing contact, 12: Guide, 13: Connection Lever, 14: first movable arc contact, 15: puffer cylinder, 16: insulating nozzle, 17: puffer piston, 18: operating rod, 19: connecting rod, 24: insulating operating rod.

Claims (9)

A container filled with an insulating gas;
A pressure generating unit having a puffer cylinder and a puffer piston disposed in the container, and having a gas blowing insulating nozzle fixed to the tip of the puffer cylinder;
A first movable electrode portion provided on the puffer cylinder side;
A second movable electrode portion connected to the first movable electrode portion via a connecting rod and separable from the first movable electrode portion;
In conjunction with the operation of the pressure generating unit and the first movable electrode unit, the second movable electrode unit is driven at the same time, and the first movable electrode unit and the second movable electrode unit are separated from each other and the pressure is applied to the arc. A double-drive puffer-type gas circuit breaker that blows the insulating gas of the generator,
A double-drive gas characterized in that a connecting rod is connected to the vicinity of a base portion of the insulating nozzle of an attachment portion of the insulating nozzle to the puffer cylinder to connect the first movable electrode portion and the second movable electrode portion. Circuit breaker.   2. The connecting rod according to claim 1, wherein the portion to which the insulating gas hits after the arc is blown is made of a material having excellent heat resistance, the first movable electrode portion and the second movable electrode that require insulation. A dual drive type gas circuit breaker characterized in that the part located between the electrode parts is a combination with a material having excellent insulation.   2. The dual drive type gas circuit breaker according to claim 1, wherein a connecting portion between the second movable electrode portion and the connecting rod is rotatably supported by a connecting lever.   3. The connecting rod according to claim 2, wherein the connecting rod is made of a fiber reinforced plastic, and a portion to which the insulating gas hits after the arc is blown is excellent in heat resistance, and between the first movable electrode portion and the second movable electrode portion. A double drive type gas circuit breaker characterized in that the kind of reinforcing fiber is adjusted so as to give a property excellent in insulating property to a portion located in the area.   2. The dual drive type gas circuit breaker according to claim 1, wherein the connecting rod is formed by connecting a plurality of kinds of members.   2. The dual drive type gas circuit breaker according to claim 1, wherein the connecting rod and the outer peripheral portion of the insulating nozzle are directly connected to each other.   2. The dual drive type gas circuit breaker according to claim 1, wherein the connecting portion between the connecting rod and the insulating nozzle is provided at a place where the second-order coefficient of the cross section of the insulating nozzle is perpendicular to the axial direction.   8. The dual drive type gas circuit breaker according to claim 7, wherein a connecting portion between the connecting rod and the insulating nozzle is provided at a portion where the diameter of the insulating nozzle changes rapidly. A container filled with an insulating gas;
A pressure generating unit having a puffer cylinder and a puffer piston disposed in the container, and having a gas blowing insulating nozzle fixed to the tip of the puffer cylinder;
A first movable electrode portion provided on the puffer cylinder side;
A second movable electrode portion connected to the first movable electrode portion via a connecting rod and separable from the first movable electrode portion;
In conjunction with the operation of the pressure generating unit and the first movable electrode unit, the second movable electrode unit is driven at the same time, and the first movable electrode unit and the second movable electrode unit are separated from each other and the pressure is applied to the arc. A double-drive puffer-type gas circuit breaker that blows the insulating gas of the generator,
A reinforcing portion is formed at a specific portion from the tip portion to the root portion of the insulating nozzle, the connecting rod is connected to the tip portion of the insulating nozzle, and the first movable electrode portion and the second movable electrode portion are connected. Features a dual drive gas circuit breaker.

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