JP2009059541A - Gas-blast circuit breaker - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas-blast circuit breaker which has a smaller size by making smaller a diameter of a conductive contact piece and its weight lighter and has excellent easiness in assembling and production. <P>SOLUTION: The gas-blast circuit breaker is provided with a pair of arc contact pieces composed of a fixed arc contact piece 20 and a movable arc contact piece 21 which are arranged in an airtight tank 100 in which an insulation gas is filled and can be connected and disconnected, a plurality of pairs of conductive contact pieces composed of fixed conductive contact pieces 23 and movable conductive contact pieces 24 respectively which are arranged on a same circumference with the pair of the arc contact pieces as a center in a predetermined distance and can be connected and disconnected in a same direction with the arc contact pieces, and a mechanical puffer chamber 26 which is provided corresponding to each of the conductive contact pieces and sprays the compressed insulation gas on the arc generated between the arc contact pieces when a current is shutdown. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a puffer-type gas circuit breaker that is installed in an electric station such as a substation or a switching station and extinguishes an arc generated between contacts by blowing insulating gas.

  As this type of gas circuit breaker, for example, in a container filled with an insulating gas, an arc contact, a cylindrical energizing contact disposed around the arc contact, and a movable one of these contacts A movable contact support portion that reciprocally drives a contact on the side (hereinafter also referred to as a movable arc contact) in the same direction with a piston rod is disposed on the same axis. A thermal puffer chamber formed by the outer periphery of the movable arc contact and the inner periphery of the movable energization contact of the puffer piston, and is in electrical contact with the movable energization contact of the puffer piston adjacent to the heat puffer chamber. And a mechanical puffer chamber formed by a sliding energizing cylinder that can slide.

  In this gas circuit breaker, when the current is interrupted, the insulating gas is heated and pressurized by the arc energy and accumulated in the heat puffer chamber. The insulating gas thus formed is blown to the arc generation region via the heat puffer chamber to recover the insulating performance (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2004-55162 (page 3-6, FIG. 1)

  In the conventional gas circuit breaker as described above, the cylindrical fixed contact and the cylindrical movable contact facing the fixed contact are each formed as a single contact having an extremely large diameter, and are electrically conductive. Since it is comprised with the copper-type raw material excellent in property and heat conductivity, the mass is very large. For this reason, it is necessary to increase the driving force for driving the movable contact, and there is a problem that it is difficult to reduce the size of the drive coupling mechanism parts and the operation device.

  Moreover, since the diameter of each contactor is large, the structure of the support part which supports these contacts also becomes large, and there existed a problem that it was difficult to miniaturize a gas circuit breaker. Furthermore, since the weight of the contactor and the support portion is extremely large, there is a problem in assembling property and manufacturability.

  The present invention has been made to solve the above-described problems, and provides a gas circuit breaker that is small in size and excellent in assembling and manufacturability by reducing the diameter and weight of the current-carrying contact. For the purpose.

  In order to solve the above-described problems and achieve the object, a gas circuit breaker according to the present invention is provided with a sealed tank filled with an insulating gas, and disposed opposite to each other in the sealed tank so as to be able to contact and separate. A pair of arc contacts, respectively disposed in the sealed tank so as to face each other, can be contacted and separated in the same direction as the pair of arc contacts, and about the axis of the pair of arc contacts A plurality of pairs of current-carrying contacts arranged around the pair of arc contacts and a movable-side current-carrying contact constituting each pair of current-carrying contacts, respectively. And a mechanical puffer unit that blows the insulating gas compressed by the movement of the energizing contacts on each movable side to an arc generated between the pair of arc contacts when shut off.

  According to the present invention, a plurality of pairs of energizing contacts are arranged around the arc contact and centered on the axis of the pair of arc contacts, compared to the conventional energizing contacts. Each pair of energizing contacts is reduced in size and weight. As a result, in addition to the miniaturization of the current-carrying contact itself, the drive connecting part and the drive device for driving the movable contact are miniaturized, and the structure of the support part for supporting these contacts is also compact. Therefore, it is possible to obtain a gas circuit breaker that is small in size and excellent in assemblability and manufacturability.

  Embodiments of a gas circuit breaker according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
1 is a cross-sectional view showing an energized state of a gas circuit breaker according to Embodiment 1 for carrying out the present invention. In FIG. 1, an opening / closing part 1 for energizing or interrupting current includes an insulating cylinder 2 made of, for example, epoxy resin, and a cylindrical container-like fixed-side cylindrical conductor 3 connected to one end of the insulating cylinder 2. The cylindrical container-like movable cylindrical conductor 4 connected to the other end of the insulating cylinder 2 is housed in a sealed tank 100 configured integrally. The sealed tank 100 is filled with an insulating gas such as sulfur hexafluoride (SF ₆ ), and is supported on the support frame 5 by the support insulator 6 and the support insulator 7. An operating device 10 is installed on the support base 5, and the opening / closing operation of the opening / closing unit 1 is performed by the operating device 10 through the insulating operation rod 11 made of an insulating member, the link mechanism 12, and the link mechanism 13. The support insulator 6 insulates and supports the vicinity of the end of the closed tank 3 installed with the shaft horizontal. Further, an insulating operation in which one end of the movable cylindrical conductor 4 is connected to the link mechanism 12 provided inside the sealed tank 3 and the other end is connected to the operating device 10 provided outside the sealed tank 3. A hole for penetrating the rod 11 is provided, and the support insulator 7 insulates and supports the periphery of the movable cylindrical conductor 4 provided with this hole.

  The opening / closing unit 1 includes a blocking unit 14 for blocking current and an energizing unit 15 for energizing a rated current. The blocking section 14 includes a fixed auxiliary conductor 300 connected to the fixed cylindrical conductor 3, a fixed arc contact 20 electrically connected to the fixed auxiliary conductor 300, and the same axis as the fixed arc contact 20. The movable arc contacts 21 are opposed to each other on the line. The movable arc contact 21 can be connected to and separated from the fixed arc contact 20 on the axis, and is electrically connected to a movable auxiliary conductor 400 connected to the movable cylindrical conductor 4 via a rod contact 22. ing. The end of the movable arc contact 21 opposite to the fixed arc contact 20 is connected to the link mechanism 12, and the movable arc contact 21 is connected to the operating device 10 via the link mechanism 12 and the insulating operation rod 11. Thus, it can be reciprocated linearly in the axial direction. Further, a link mechanism 13 is connected to the movable arc contact 21, and a movable energized contact, which will be described later, reciprocates in the axial direction in conjunction with the operation of the movable arc contact 21 via the link mechanism 13. It is configured.

  2 is an enlarged cross-sectional view taken along the line II-II in FIG. 1, FIG. 3 is a partially enlarged cross-sectional view showing a partial configuration of the interrupting portion and the energizing portion in the energized state, and FIG. It is a partial expanded sectional view which shows a part structure. 2 is a cross-sectional view taken along the line II-II in FIG. 1 when viewed in the direction of the arrow. As shown in FIGS. 2 to 4, the energizing portion 15 includes a fixed energizing contact 23 electrically connected to the fixed side auxiliary conductor 300 and a cylindrical movable energizing contact facing the fixed energizing contact 23. In the example shown in the figure, four such energizing sections 15 are provided. That is, each energization part 15 consists of a pair of energization contacts (fixed energization contactor 23 and movable energization contactor 24), and such four energization parts 15 are interception part 14 as shown in FIG. For example, are arranged at equal intervals on a concentric circle. Specifically, four pairs of energizing contacts are arranged around the central axis A of the movable arc contact 21 or the fixed arc contact 20 with the axis parallel to the central axis A, and these four pairs of energizing contacts. When the child is viewed in a plan view from the direction of the central axis A, each energizing contact is arranged on a concentric circle with a predetermined radius centered on the central axis A and spaced apart from each other, for example, at equal intervals. Has been. In addition, the four energization units 15 are electrically connected in parallel with the blocking unit 14. The movable energizing contact 24 can be brought into and out of contact with the fixed energizing contact 23 on the axis. The end of the movable energizing contact 24 formed in a cylindrical shape on the side of the fixed energizing contact 23 is in an open state, and the open end is fitted into the fixed energizing contact 23 to be in a contact state. A disc-shaped end plate (or a bottom plate when the cylinder is raised in the axial direction) is provided at the end of the movable energizing contact 24 opposite to the end of the fixed energizing contact 23. The piston rod 221 connected to the link mechanism 13 is fixed to the end plate, and the piston rod 221 also reciprocates in the same direction in accordance with the reciprocating movement of the movable arc contactor 21 so that each energizing contactor is contacted and separated. Is made. The movable side auxiliary conductor 400 is connected to the movable side cylindrical conductor 401, and the movable energizing contact 24 is in electrical contact with the movable side cylindrical conductor 401 via the ring-shaped contact 25. It is slidably connected.

  The mechanical puffer chamber 26 formed by the cylinder of the cylindrical movable energizing contact 24 and the cylinder formed by the movable auxiliary conductor 400 and the movable cylindrical conductor 401 is composed of the movable energizing contact 24 and the fixed energizing contact 23. The volume changes in accordance with the opening / closing operation. The insulating member 28 connected to the fixed auxiliary conductor 300 extends to the movable side along the outer peripheral surface of the fixed arc contact 20, and the insulating nozzle 27 connected to the movable auxiliary conductor 400 extends to the fixed side. ing. The mechanical puffer chamber 26 has an arc generation region 30 in which an arc is generated when the fixed arc contact 20 and the movable arc contact 21 are separated via a blow-off passage 29 formed by an insulating nozzle 27 and an insulating member 28. Communicate.

  Here, the movable side cylindrical conductor 4, the movable side auxiliary conductor 400, and the movable side cylindrical conductor 401 are collectively referred to as a movable side conductor, and the fixed side cylindrical conductor 3 and the fixed side auxiliary conductor 300 are collectively referred to as a fixed side conductor. These are formed using, for example, a copper-based material having excellent conductivity and heat conductivity. In addition, the fixed arc contact 20 and the fixed energization contact 23 are made of, for example, finger contacts that are highly elastic and have excellent holding power.

  Next, the operation of the present embodiment will be described. In the gas circuit breaker configured as described above, the movable arc contact 21 of the breaker 14 operates in the axial direction with respect to the fixed arc contact 20 by the operating device 10 via the link mechanism 12 and the insulating operating rod 11. It can be opened and closed. In conjunction with this opening / closing operation, the movable energizing contact 24 of the energizing portion 15 is opened / closed via the link mechanism 13 with respect to the fixed energizing contact 23.

  Next, the operation at the time of current interruption will be described. First, the movable energizing contact 24 and the fixed energizing contact 23 constituting the four pairs of energizing contacts are separated, and then the movable arc contact 21 is separated from the fixed arc contact 20. An arc is generated in the arc generation region 30 between the movable arc contact 21 and the fixed arc contact 20 by this breaking operation. At this time, the insulating gas in each mechanical puffer chamber 26 is compressed and the pressure rises with the opening operation of each movable energizing contact 24. As a result, the high-pressure insulating gas is blown to the arc in the arc generation region 30 through the blowing flow path 29, whereby the arc is extinguished and the current is interrupted.

  On the other hand, at the time of current energization (injection), the movable arc contact 21 and the fixed arc contact 20 are connected, and thereafter, the movable energization contact 24 and the fixed energization contact 23 that respectively constitute four pairs of energization contacts. Current is passed by being connected simultaneously.

  According to the present embodiment, the fixed energizing contact 23 and the movable energizing contact are respectively arranged at predetermined intervals on the same circumference around the pair of arc contacts composed of the fixed arc contact 20 and the movable arc contact 21. Since the four pairs of energizing contacts comprising the child 24 are arranged in parallel electrically, each energizing contact only has to share a quarter of the energizing current. Therefore, the diameter of each fixed energizing contact 23 and each movable energizing contact 24 can be reduced to about 1/4 of the conventional one, and the mass of the movable part can be reduced.

In general, the work performed by the driving force F for opening and closing the movable contact is proportional to the kinetic energy of the movable contact, and the movable contact's mass m and the speed v of the movable contact at the moving distance L are as follows. And the following equation (1) according to the law of conservation of energy.

  The driving force F of the operating device 10 is a total value of the driving force F1 for opening / closing the movable arc contact 21 and the driving force F2 for opening / closing each movable energizing contact 24, and F1 and F2 are also the above (1). There is an expression relationship.

  From the above equation (1), it can be seen that the mass m of the movable contact and the driving force F are in a proportional relationship, and the driving force F can be reduced by reducing the mass m of the movable contact. In the present embodiment, the mass of the movable part can be reduced compared to the conventional case, and therefore F can be reduced. As the driving force F is reduced, the drive connection mechanism components such as the link mechanism 12, the link mechanism 13, and the insulating operation rod 11 can be reduced in size, so that the operating device 10 can be reduced in size.

In the present embodiment, the moving distance L1 of the movable arc contact 21 and the moving distance L2 of the movable energizing contact 24 are determined by the ratio between the support lengths L3 and L4 of the arm 130 of the link mechanism 13, It has the relationship of the following formula (2).
L1: L2 = L3: L4 (2)
Therefore, if the support-to-support length L4 of the arm 130 is ½ of L3, the moving distance L2 of the movable energizing contact 24 is ½ of the moving distance L1 of the movable arc contact 21.

  In the present embodiment, since the movable energizing contact 24 and the movable arc contact 21 are interlocked, the speed of the movable energizing contact 24 is ½ of the speed of the movable arc contact 21.

  Thus, the moving distance L and the speed v are correlated, and the driving force F is proportional to the square of the speed v and inversely proportional to the moving distance L from the above equation (1), so the moving distance L is short. It can also be seen that the driving force F can be reduced.

  As described above, the moving distance L <b> 2 of the movable energizing contact 24 can be adjusted to be shorter than the moving distance L <b> 1 of the movable arc contact 21 by the link mechanism 13. That is, since the driving force F can be reduced by reducing the moving distance L2 of the movable energizing contact 24, the operating device 10 can be reduced in size, and the axial length of the mechanical puffer chamber 26 can be shortened. Can be miniaturized.

  In the present embodiment, the configuration in which the energizing current is divided by the four pairs of energizing contacts each including the fixed energizing contact 23 and the movable energizing contact 24 is shown. A configuration can be employed, and in this case as well, the same effect as in the present embodiment can be obtained. In addition, although the fixed arc contact 20 and the fixed energization contact 23 are finger contacts, the same effect can be obtained as long as the contacts are separable. In addition, as shown in FIG. 2, the current-carrying contacts are arranged so as to be equidistant from each other on the same circumference with the arc contact as the center, but the present invention is not limited to this and is arranged at a predetermined interval. Other configurations are possible.

Embodiment 2. FIG.
FIG. 5 is a cross-sectional view showing the blocking portion and the energization portion in the second embodiment for carrying out the present invention, and FIG. 6 shows a partial configuration of the blocking portion and the energization portion in the blocking state along line VI-VI in FIG. It is a fragmentary sectional view. 5 is a perspective cross-sectional view when the gas circuit breaker is viewed in the direction of the central axis A shown in FIG. 1 in detail, and shows the arrangement relationship of components necessary for the description of the present embodiment. Is. FIG. 6 is a cross-sectional view taken along the line VI-VI in FIG. 5 when viewed in the direction of the arrow. 5 and 6, the same reference numerals as those in the first embodiment denote the same parts, and the description thereof will be omitted below. 5 and 6 is the same as that of the first embodiment shown in FIG. 1, for example.

  In the present embodiment, a heat puffer chamber 31 is provided, and the configuration of the blow-out flow path 29 of the first embodiment is modified accordingly, and the shutoff unit 14 and the energization unit regardless of whether the shutoff or energization is performed. 15 is shifted to the left and right in the axial direction. A heat puffer chamber 31 is disposed around the arc generation region 30 of the interrupting portion 14, and the heat puffer chamber 31 has an annular shape so as to surround the arc generation region 30 along the circumferential direction about the central axis A. Alternatively, the insulating gas that is formed in a donut shape and is heated and pressured by arc energy is stored in the heat puffer chamber 31. The heat puffer chamber 31 has a cylindrical outer peripheral plate 310 having one end fixed to the movable auxiliary conductor 400 and a circular opening that is fixed to the other end of the outer peripheral plate 310 and through which the movable arc contactor 21 is inserted. The disk-shaped side plate 311 is formed, and the insulating nozzle 312 fixed to the inner peripheral surface of the opening of the side plate 311 and disposed around the movable arc contactor 21. In the present embodiment, the cross-sectional shape of the surface of the heat puffer chamber 31 formed in an annular shape or a donut shape perpendicular to the circumferential direction is a rectangle, and the heat puffer chamber 31 includes the inner peripheral surface of the outer peripheral plate 310, A region that is coaxially disposed on the outer peripheral plate 310 and is surrounded by an outer peripheral surface of a virtual inner cylinder defined by the insulating nozzle 312, and is formed as a region between the side plate 311 and the movable side auxiliary conductor 400. ing. In addition, an opening is formed at the tip of the insulating nozzle 312 in the heat puffer chamber 31 so as to open all around the arc generation region 30, and the blowout flow path 29 is formed by this opening. Has been.

  The heat puffer chamber 31 and the mechanical puffer chamber 26 are communicated with each other through a communication hole 32 provided in the movable side auxiliary conductor 400, and the heat puffer chamber 31 is connected to the mechanical puffer chamber 26 from the communication hole 32. A check valve 33 for preventing gas flow is provided.

  The movable arc contactor 21 connects the rod contactor 22, the side plate 311, the rod contactor 22 and the side plate 311, and the conductive member 220 provided with holes in some places, and the outer peripheral plate 310, and the movable side cylinder. The movable side auxiliary conductor 400 connected to the conductor 4 is electrically connected. The check valve 33 is provided above the tip of the insulating member 28 protruding to the movable side so as to face the insulating nozzle 312.

  Next, the interruption | blocking operation | movement of the gas circuit breaker of this Embodiment comprised as mentioned above is demonstrated. In the interruption of the large current region, the insulating gas in the arc generation region 30 is heated and pressurized by the arc energy and accumulated in the heat puffer chamber 31. When the pressure of the heat puffer chamber 31 becomes larger than the pressure of the mechanical puffer chamber 26, the check valve 33 is closed and the communication hole 32 is closed. Thereafter, when the current nears the zero point, the heating pressure increase in the arc generation region 30 decreases, so that the arc is extinguished by blowing the high-pressure insulating gas stored in the heat puffer chamber 31 onto the arc in the arc generation region 30. Current interruption. Along with this operation, the pressure in the heat puffer chamber 31 decreases, so the pressure in the mechanical puffer chamber 26 becomes relatively large, and the check valve 33 opens. With this opening operation, the compressed cold insulating gas in the mechanical puffer chamber 26 is blown to the arc generation region 30 via the heat puffer chamber 31, thereby recovering the insulating performance.

  In the interruption of the small current region, the insulating gas in the arc generation region 30 is not heated so much, so the pressure in the heat puffer chamber 31 does not increase so much. Accordingly, the check valve 33 of the communication hole 32 is kept open. After that, the insulating gas compressed in the mechanical puffer chamber 26 is blown to the arc generation region 30 via the heat puffer chamber 31, so that the arc is extinguished, the current is cut off, and the insulating performance is restored. To do.

  In the interruption of the medium current region, the pressures in the heat puffer chamber 31 and the mechanical puffer chamber 26 are substantially equal. For this reason, the check valve 33 maintains an open state, but no gas flow from the heat puffer chamber 31 to the mechanical puffer chamber 26 occurs. Thereafter, as the current zero point is approached, the heating pressure increase in the arc generation region 30 decreases, so that the arc is extinguished by blowing the high-pressure insulating gas accumulated in the heat puffer chamber 31 onto the arc in the arc generation region 30. Current interruption. Subsequently, the compressed cold insulating gas in the mechanical puffer chamber 26 is blown to the arc generation region 30 via the heat puffer chamber 31, thereby recovering the insulating performance.

  According to the present embodiment, the annular or donut-shaped heat puffer chamber 31 is disposed on the outer periphery of the arc generation region 30 of the interrupting portion 14 so as to surround the entire periphery thereof, so that the heat puffing effect can be obtained when the current is interrupted. In addition, the mechanical puffer chamber 26 can be made relatively small. That is, the diameters of the fixed energizing contact 23 and the movable energizing contact 24 can be reduced to the limit at which the energizing capacity can be secured. Alternatively, since the moving distance L2 of the movable energizing contact 24 can be shortened, the opening / closing part 1 can be downsized. Furthermore, since the driving force F can be reduced in proportion to the mass m or the moving distance L2 of the movable energizing contact 24, the operating device 10 can be further downsized.

Embodiment 3 FIG.
7 is a cross-sectional view showing a blocking portion and an energizing portion in Embodiment 3 for carrying out the present invention, and FIG. 8 shows a partial configuration of the blocking portion and the energizing portion in the blocking state taken along line VIII-VIII in FIG. FIG. 9 is a partial cross-sectional view, and FIG. 9 is a partial cross-sectional view showing a partial configuration of the cut-off portion and the energization portion in the cut-off state along the line IX-IX in FIG. FIG. 7 is a perspective sectional view when the gas circuit breaker is viewed in the direction of the central axis A shown in FIG. 1 in detail, and shows an arrangement relationship of components necessary for the description of the present embodiment. Is. 7-9, the same code | symbol as Embodiment 1 shows the same part, and abbreviate | omits description below.

  In the present embodiment, a thermal puffer chamber 40 formed in an annular shape or a donut shape is disposed so as to surround the arc generation region 30 with the central axis A as the center. About a perpendicular direction, it is provided between the axis of the fixed energizing contact 23 and the movable energizing contact 24 and the axis of the fixed arc contact 20 and the movable arc contact 21 and is parallel to the central axis A. Is provided in a region between the movable side auxiliary conductor 400 and the fixed side auxiliary conductor 300. Further, the heat puffer chamber 40 is provided as an internal space formed by fixing the open end of the wall plate having, for example, a U shape on the insulating member 28, and the cross-sectional shape perpendicular to the circumferential direction is It is a rectangle. Thus, the heat puffer chamber 40 is different in arrangement and configuration from the heat puffer chamber 31 described in the second embodiment. The thermal puffer chamber 40 is disposed so as to communicate with the blowout flow passage 29 from the mechanical puffer chamber 26 through a plurality of (for example, four in the illustrated example) communication holes 41 provided in the insulating member 28. Has been. Further, a check valve 42 for preventing a gas flow from the arc generation region 30 to the mechanical puffer chamber 26 is disposed in the blowout flow path 29.

  Next, an operation when the gas circuit breaker according to the present embodiment configured as described above is interrupted, particularly an interrupt operation in a large current region will be described. The insulating gas in the arc generation region 30 is heated and pressurized by the arc energy to become a high pressure. Therefore, a gas flow is generated toward each mechanical puffer chamber 26 and the heat puffer chamber 40 through the blowout flow passage 29 and the communication hole 41, respectively. Thereafter, when the pressure in the arc generation region 30 becomes higher than the pressure in the mechanical puffer chamber 26, the check valve 42 disposed in the blow-out flow path 29 is closed to prevent gas flow into the mechanical puffer chamber 26. . For this reason, most of the gas flow is accumulated in the heat puffer chamber 40 through the communication hole 41, and the pressure in the heat puffer chamber 40 increases. Subsequently, since the heating pressure increase in the arc generation region 30 decreases as the current zero point is approached, the high-pressure insulating gas stored in the heat puffer chamber 40 is blown to the arc in the arc generation region 30 through the communication hole 41. As a result, the arc is extinguished and the current is interrupted. Next, as the pressure in the arc generation region 30 decreases, the check valve 42 opens, and the cold insulating gas in the mechanical puffer chamber 26 is blown to the arc generation region 30 via the blow-out flow path 29, so that the insulation performance is improved. Recover.

  According to the present embodiment, the following effects are obtained in addition to the effects described in the first embodiment. As described above, by providing the heat puffer chamber 40 between the movable side auxiliary conductor 400 and the fixed side auxiliary conductor 300, the axial length can be further reduced. Further, since the insulating gas that has become high pressure in the mechanical puffer chamber 26 is blown to the arc generation region 30 without passing through the heat puffer chamber 40, the insulating performance can be recovered more efficiently.

  In the present embodiment, a plurality of communication holes 41 are provided in the insulating member 28. However, instead of such communication holes 41, an opening may be provided for the entire circumference of the arc generation region 30. .

Embodiment 4 FIG.
FIG. 10 is a cross-sectional view showing a blocking portion and an energization portion in Embodiment 4 for carrying out the present invention, and FIG. 11 shows a partial configuration of the blocking portion and the energization portion in the blocking state along the line AI-AI in FIG. FIG. 12 is a partial cross-sectional view, and FIG. 12 is a partial cross-sectional view showing a partial configuration of the cut-off portion and the energization portion in the cut-off state along the line AII-AII in FIG. FIG. 10 is a perspective sectional view when the gas circuit breaker is viewed in the direction of the central axis A shown in FIG. 1 in detail, and shows the arrangement relationship of components necessary for the description of the present embodiment. Is. 10-12, the same code | symbol as Embodiment 3 shows the same part, and description is abbreviate | omitted here.

  In the present embodiment, in addition to the heat puffer chamber 40 of the third embodiment, a heat puffer chamber 43 is further provided. That is, for a plurality of pairs of energizing contacts (fixed energizing contact 23 and movable energizing contact 24), a cylindrical heat puffer chamber 43 is provided between each pair of energizing contacts adjacent to each other. Each heat puffer chamber 43 communicates with the heat puffer chamber 40 through the communication hole 44. Further, the centers of the respective heat puffer chambers 43 are respectively arranged on the same circumference as the circumference around the central axis A where the center of each energizing contact is located. Each heat puffer chamber 43 is formed to have the same length as the heat puffer chamber 40 in the direction of the central axis A, and is provided at a position further away from the arc generation region 30 than the heat puffer chamber 40. .

  Next, an operation when the gas circuit breaker according to the present embodiment configured as described above is interrupted, particularly an interrupt operation when a large current is interrupted will be described. Since the insulating gas in the arc generation region 30 is heated and pressure-induced by the arc energy and becomes high pressure, the insulating gas is accumulated in the heat puffer chamber 43 via the heat puffer chamber 40 and the communication hole 44. Since the heating pressure increase in the arc generating region 30 decreases as the current zero point is approached, the high-pressure insulating gas stored in the heat puffer chamber 40 and the heat puffer chamber 43 is blown to the arc through the communication hole 41 to generate a current. Cut off.

  According to the present embodiment, the following effects are obtained in addition to the effects of the third embodiment. As described above, the cylindrical heat puffer chamber 43 communicated with the heat puffer chamber 40 via the communication hole 44 is disposed between the pair of energized contacts in the circumferential direction centered on the central axis A, thereby energizing. The space between the contact pairs can be used effectively, and a large-capacity heat puffer chamber can be obtained, thereby further improving the shut-off performance. Furthermore, the insulating performance decreases as the insulating gas becomes higher in temperature, but since the insulating gas is cooled by being mixed with the cold insulating gas in the heat puffer chamber 43, there is an effect that the blocking performance is further improved.

FIG. 3 is a cross-sectional view showing an energized state of the gas circuit breaker in the first embodiment. It is an expanded sectional view in the II-II line of FIG. FIG. 3 is a partial enlarged cross-sectional view showing a partial configuration of a cut-off portion in an energized state and an energized portion in the first embodiment. FIG. 3 is a partial enlarged cross-sectional view illustrating a partial configuration of a blocking unit and a current-carrying unit in a blocking state according to Embodiment 1. FIG. 6 is a cross-sectional view showing a blocking part and an energization part in a second embodiment. It is a fragmentary sectional view which shows the partial structure of the interruption | blocking part of the interruption | blocking state in the VI-VI line of FIG. 5, and an electricity supply part. FIG. 10 is a cross-sectional view showing a blocking part and an energization part in Embodiment 3. It is a fragmentary sectional view which shows the partial structure of the interruption | blocking part of the interruption | blocking state in the VIII-VIII line of FIG. 7, and an electricity supply part. It is a fragmentary sectional view which shows the partial structure of the interruption | blocking part of the interruption | blocking state in the IX-IX line of FIG. 7, and an electricity supply part. It is sectional drawing which shows the interruption | blocking part in Embodiment 4, and an electricity supply part. It is a fragmentary sectional view which shows the partial structure of the interruption | blocking part of the interruption | blocking state in the AI-AI line of FIG. 10, and an electricity supply part. It is a fragmentary sectional view which shows the partial structure of the interruption | blocking part of the interruption | blocking state in the AII-AII line of FIG. 10, and an electricity supply part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Opening / closing part 2 Insulating cylinder 3 Fixed side cylindrical conductor 4 Movable side cylindrical conductor 6, 7 Support insulator 10 Operating device 11 Insulating operation rod 12, 13 Link mechanism 14 Shutter 15 Current-carrying part 20 Fixed arc contact 21 Moving arc contact 22 Rod contactor 23 Fixed energizing contactor 24 Movable energizing contactor 25 Contactor 26 Mechanical puffer chamber 29 Blowout flow path 30 Arc generation region 31 Thermal puffer chamber 32, 41, 44 Communication hole 33 Check valve 40, 43 Thermal puffer chamber DESCRIPTION OF SYMBOLS 100 Sealed tank 310 Outer peripheral plate 311 Side plate 312 Insulation nozzle 400 Movable side auxiliary conductor 401 Movable side cylindrical conductor

Claims (12)

A sealed tank filled with insulating gas;
A pair of arc contacts arranged opposite to each other in the sealed tank and capable of contacting and separating;
Each of the closed tanks is disposed opposite to each other, and can be contacted and separated in the same direction as the pair of arc contacts, and around the pair of arc contacts around the axis of the pair of arc contacts. A plurality of pairs of current-carrying contacts that are spaced apart from each other;
The pair of arc contacts is provided to correspond to each of the movable-side energizing contacts constituting each pair of energizing contacts, and the insulating gas compressed by the movement of each of the movable-side energizing contacts when the current is interrupted. A mechanical puffer that sprays the arc generated between the children,
A gas circuit breaker comprising:   2. The gas circuit breaker according to claim 1, wherein an energization current during energization is equally divided into the plurality of pairs of energization contacts. 3.   3. The gas according to claim 1, wherein the plurality of pairs of energizing contacts are arranged on a circumference having a predetermined diameter centered on the axis when viewed from the axial direction. Circuit breaker. The mechanical puffer part is
A cylindrical piston formed by the energizing contact on the movable side;
A cylinder formed so as to surround the outer periphery of the piston and forming a mechanical puffer chamber with the piston;
A blow-out passage formed from the mechanical puffer chamber toward the arc generation region and through which the insulating gas flows,
The gas circuit breaker of any one of Claims 1-3 characterized by the above-mentioned.   5. The gas circuit breaker according to claim 4, wherein the cylinder is formed by a movable side conductor electrically connected to the movable side energizing contact. 6. The movable contact on each movable side and the movable arc contact constituting the pair of arc contacts are connected, and the contact and separation of the pair of arc contacts and the contact of the plurality of pairs of current contacts are performed. It further includes a drive connecting part that links the release,
6. The gas according to claim 4, wherein the drive connecting portion is configured to make a movable distance of the energizing contact on each movable side shorter than a movable distance of the arc contact on the movable side. Circuit breaker.   The thermal puffer part which sprays the insulating gas heated and pressurized by the arc energy generated between the pair of arc contacts to the arc in the vicinity of the current zero point is further provided. Gas circuit breaker. The mechanical puffer part is
A cylindrical piston formed by the energizing contact on the movable side;
A cylinder formed so as to surround the outer periphery of the piston and forming a mechanical puffer chamber with the piston;
With
The heat puffer part is
A thermal puffer chamber that communicates with the mechanical puffer chamber through a communication hole and opens toward an arc generation region;
Insulating gas flow from the thermal puffer chamber to the mechanical puffer chamber is prevented, and when the pressure of the mechanical puffer chamber becomes larger than the pressure of the thermal puffer chamber, the mechanical puffer chamber is moved to the thermal puffer chamber. A backflow prevention unit that allows the insulating gas to flow to
The gas circuit breaker according to claim 7, comprising:   The heat puffer chamber is formed in an annular shape so as to surround the arc generation region with the axis as a center, and an opening is formed on the inner peripheral surface thereof over the entire circumference. The gas circuit breaker according to claim 7 or 8. The mechanical puffer part is
A cylindrical piston formed by the energizing contact on the movable side;
A cylinder formed so as to surround the outer periphery of the piston and forming a mechanical puffer chamber with the piston;
A blow-out passage formed from the mechanical puffer chamber toward the arc generation region and through which the insulating gas flows,
The flow of insulating gas from the arc generation region to the mechanical puffer chamber is prevented, and when the pressure of the mechanical puffer chamber becomes larger than the pressure of the arc generation region, the arc generation region is transferred from the mechanical puffer chamber. A backflow prevention unit that allows the insulating gas to flow to
With
The heat puffer part is
It is arranged between the movable side conductor part that constitutes the bottom surface of the cylinder and the fixed side conductor part to which the current-carrying contact on the fixed side is fixed, and annularly so as to surround the arc generation region with the axis as the center A heat puffer chamber formed with an opening that opens toward the arc generation region on the inner peripheral surface thereof,
The gas circuit breaker according to claim 7, comprising:   The gas circuit breaker according to claim 10, wherein a gas flow from the mechanical puffer chamber to the arc generation region is blown to the arc without passing through the heat puffer chamber.   The heat puffer chambers are respectively provided between a first chamber formed in an annular shape so as to surround the arc generation region with the axis as a center, and the plurality of pairs of energizing contacts adjacent to each other. The gas circuit breaker according to claim 10 or 11, comprising a plurality of second chambers respectively communicating with the other chambers.

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