The present invention relates to a vacuum circuit breaker used for an electric power transmission-distribution facility, an electric power reception-distribution facility and the like.
In conventional tank-type vacuum circuit breakers, there is a well-known vacuum circuit breaker that is configured in such a way that a main body of the vacuum circuit breaker is installed in a pressure tank in which an insulation medium, such as SF6 gas or dry air, is encapsulated at about 0.05 to 0.5 MPa·g of gas pressure, and the main body of the vacuum circuit breaker is led to the outside of the pressure tank and connected to a main circuit conductor.
A conventional tank-type vacuum circuit breaker is illustrated in
Patent Document 1: Japanese Laid-Open Patent Publication No. 2003-319515 (Page 2, FIG. 2)
In an electric power transmission-distribution facility and an electric power reception-distribution facility, a vacuum circuit breaker as well as other units is arranged in a limited facility space, so that it is greatly required that an installation area for the vacuum circuit breaker is reduced.
However, in a switching device indicated in Patent Document 1, a main body of a circuit breaker is horizontally arranged in a tank having a cylindrical shape. Moreover, an operation mechanism is installed (mounted) at one end portion in an axis direction of the tank, so that there have been problems in that a size of the device is increased in a horizontal direction, and the installation area for the switching device is increased.
The present invention has been considered (made) to solve above-described problems, and an object of the invention is to provide a vacuum circuit breaker by which the installation area can be reduced while insulation performance in a tank is maintained.
A vacuum circuit breaker of the present invention includes a vacuum valve in which a fixed electrode and a movable electrode are faced and arranged in a vacuum case, whereby a fixed conductor is led from the fixed electrode, and a movable conductor is led from the movable electrode; pressure tanks corresponding to three-phase, which are configured by linearly arranging three pressure tanks respectively corresponding to one-phase, in which insulation gas is encapsulated, and the vacuum valve is installed; a pair of bushings mounted on an upper portion of each of the pressure tanks; a fixed-side connection conductor for connecting the fixed conductor and a central conductor of the bushing that is one of the pair of bushings; a movable-side connection conductor for connecting the movable conductor and a central conductor of the other bushing; and an operation mechanism for driving the movable conductor; wherein the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper-lower direction, and the movable conductor is positioned lower than the vacuum valve, and moreover, the movable-side connection conductor is arranged in each of the pressure tanks in a state where a longitudinal direction of the movable-side connection conductor is aligned with an upper-lower direction.
Moreover, each of the pressure tanks is formed with a nearly ellipsoidal shape viewed from a plane surface and arranged in a state where a longitudinal direction of each of the pressure tanks is inclined in the same direction, viewed from a plane surface, with respect to an arrangement direction of each of the pressure tanks, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper-lower direction, and the movable conductor is positioned lower than the vacuum valve.
According to the vacuum circuit breaker of the present invention, the vacuum circuit breaker includes each of pressure tanks corresponding to three-phase, which are configured by linearly arranging three pressure tanks, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper-lower direction, and the movable conductor is positioned lower than the vacuum valve, and moreover, the movable-side connection conductor is arranged in each of the pressure tanks in a state where a longitudinal direction of the movable-side connection conductor is aligned with an upper-lower direction, so that a size of the pressure tank in a width direction can be reduced while insulation performance of units in the pressure tank is maintained, whereby an installation area of the vacuum circuit breaker can be reduced.
Moreover, each of the pressure tanks corresponding to three-phase, which are configured by linearly arranging three pressure tanks, is formed with a nearly square shape viewed from a plane surface and arranged in a state where a longitudinal direction of each of the pressure tanks is inclined in the same direction, viewed from a plane surface, with respect to an arrangement direction of each of the pressure tanks, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper-lower direction, and the movable conductor is positioned lower than the vacuum valve, so that effects are added to the above-described effect, in which a strength of the pressure tank can be more increased, and durability of the pressure tank can be increased.
Firstly, units corresponding to one-phase in the vacuum circuit breaker will be explained in reference to the vertical cross-sectional view in
The inside of the pressure tank 1 is partitioned into a circuit breaker room 7, in which main circuit units including a vacuum valve 9 are housed, and an operation mechanism room 8, in which an operation mechanism 10 is housed, and both rooms are configured so as to be hermetically sustained. Although insulation gas is encapsulated in the circuit breaker room 7 at a predefined pressure, the operation mechanism room 8 may be sustained at atmospheric pressures. In addition, the vacuum circuit breaker may be configured in such a way that both the rooms are completely partitioned, and the circuit breaker room 7 in
The vacuum valve 9, in which a main contact for keeping a predefined insulation distance with respect to the side walls 1c and for breaking a current is installed, is arranged in the circuit breaker room 7 of the pressure tank 1. In the vacuum valve 9, a fixed conductor 9a, which includes a fixed electrode 9c at a tip of the fixed conductor 9a, and a movable conductor 9b, which includes a movable electrode 9d at a tip of the movable conductor 9b, are installed in a vacuum case 9e in a state where both conductors are facing each other. Each of end portions of the fixed conductors 9a and 9b is led to the outside of the vacuum case 9e, and the movable conductor 9b is driven in an axis direction of the vacuum valve 9, whereby the both electrodes 9c and 9d are contacted or separated. The vacuum valve 9 is arranged in a state where an axis direction is aligned with an upper-lower direction (vertical direction). In other words, the vacuum valve 9 is arranged in a state where a drive direction of the movable conductor 9b is aligned with the upper-lower direction, the movable conductor 9b is positioned at the lower side.
The operation mechanism 10 for driving the movable conductor 9b is arranged at a position along the axis, which is further lower than a position of the movable conductor 9b that is led from the lower side of the vacuum valve 9. The movable conductor 9b is linked to the operation mechanism 10 via an insulation rod 11 and an operation rod 12. In addition, although an example of a system for the operation mechanism 10, which is driven by an electromagnetic force of an electromagnetic coil, is indicated in
The fixed conductor 9a of the vacuum valve 9 is connected to a fixed-side connection conductor 13a that is arranged so as to be keeping a predefined insulation distance with respect to the side walls 1c. An insertion member having a concave shape is provided at an upper side of the fixed-side connection conductor 13a, and a lower end portion of the central conductor 4a of the bushing 2a, which is one side of the bushings, is inserted to the insertion member so as to be electrically connected.
On the other hand, the movable conductor 9b of the vacuum valve 9 is connected, via a flexible conductor 14, to a movable-side connection conductor 13b that is arranged in a vertical direction so as to be keeping a predefined insulation distance with respect to the side walls 1c. Other insertion member having a concave shape is also provided at an upper side of the movable-side connection conductor 13b, and a lower end portion of the central conductor 4b of the bushing 2b, which is other side of the bushings, is inserted to the other insertion member so as to be electrically connected. A current transformer 15 for measuring a current is provided at a lower side of the both bushings 2a and 2b.
In addition, only components required for the present invention are illustrated in
In the vacuum circuit breaker that is configured as described above, a current pathway of a main circuit is formed, in which the terminal conductor 5a of the bushing 2a, which is one side of the bushings, the central conductor 4a, the fixed-side connection conductor 13a, the vacuum valve 9, the flexible conductor 14, the movable-side connection conductor 13b, the central conductor 4b of the bushing 2b, which is other side of the bushings, and the terminal conductor 5b are sequentially linked. Thus, the operation mechanism 10 is driven by a drive command from an operation panel that is described later, and both electrodes 9c and 9d are contacted or separated, whereby the main circuit is connected or broken.
Secondary, a whole arrangement of units corresponding to three-phase will be explained in reference to the plane cross-sectional view in
On the other hand, the movable-side connection conductor 13b is arranged at a position where it is neared to a position in the other diagonal direction—a position in the opposite diagonal direction with respect to the vacuum valve 9—, and keeps a sufficient insulation distance with respect to the vacuum valve 9 and the side walls 1c of the pressure tank 1. (In addition, both units are arranged at positions in the diagonal directions, and it is not required that the units are arranged at positions along the diagonal line.)
Moreover, a pair of bushings 2a and 2b respectively corresponding to each phase are arranged at positions above opposite sides being orthogonal with respect to an arrangement direction of the pressure tank 1.
Hereinafter, the action of the vacuum circuit breaker configured as described above will be explained.
Because the vacuum valve 9 is arranged in the pressure tank 1 in such a way that the drive direction of the movable conductor 9b is aligned with the upper-lower direction, a width of the pressure tank 1 can be reduced, and a width of the vacuum circuit breaker, which is viewed from an arrangement direction (thick arrow direction in
In addition, because the vacuum valve 9 and the movable-side connection conductor 13b are arranged in a diagonal direction of the pressure tank 1, a width of the pressure tank 1 in an interphase direction is increased. However, a size in the interphase direction is determined in accordance with an interphase-aerial-insulation distance, so that the whole arrangement area is rarely increased in the arrangement direction of the pressure tank 1, because the vacuum valve 9 and the movable-side connection conductor 13b are arranged in a diagonal direction of the pressure tank 1.
As described above, the vacuum circuit breaker according to Embodiment 1 includes a vacuum valve in which a fixed electrode and a movable electrode are faced and arranged in a vacuum case, whereby a fixed conductor is led from the fixed electrode, and a movable conductor is led from the movable electrode; pressure tanks corresponding to three-phase, which are configured by linearly arranging three pressure tanks respectively corresponding to one-phase, in which insulation gas is encapsulated, and the vacuum valve is installed; a pair of bushings mounted on an upper portion of each of the pressure tanks; a fixed-side connection conductor for connecting the fixed conductor and a central conductor of one of the pair of bushings; a movable-side connection conductor for connecting the movable conductor and a central conductor of the other bushing; and an operation mechanism for driving the movable conductor; wherein each of the pressure tanks is formed with a nearly square shape viewed from a plane surface and arranged in a state where side surfaces of the neighboring pressure tanks are faced, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper-lower direction, and the movable conductor is positioned lower than the vacuum valve, so that a size of the pressure tank, viewed from an arrangement direction, in a width direction can be reduced while insulation performance of units in the pressure tank is maintained, whereby an installation area of the vacuum circuit breaker can be reduced.
Moreover, the vacuum valve is neared to a position in one of diagonal directions of the pressure tank having a nearly square shape and arranged in such a way that a center position of the vacuum valve is separated nearly same distance from side walls of the pressure tank, which are positioned near the vacuum valve, and the movable-side connection conductor is neared to a position in the other diagonal direction and arranged, so that the size of the pressure tank in the width direction can be more reduced, whereby the installation area of the vacuum circuit breaker can be more reduced.
Furthermore, the operation mechanism is configured in such a way that the operation mechanism is arranged at a lower position of the vacuum valve and linked to the movable conductor of the vacuum valve via an insulation rod, and the movable conductor is driven in an upper/lower direction by a driving force of the operation mechanism, so that the operation mechanism is not jutted from an outside surface, whereby the installation area of the vacuum circuit breaker can be reduced.
As illustrated in
The vacuum valve 9 installed in each pressure tank 17 is arranged at a position where the center of the vacuum valve 9 is neared to a position in one of longitudinal directions of the pressure tank 17 having an ellipsoidal shape, and the vacuum valve 9 keeps a necessary insulation distance with respect to the side walls of the pressure tank 17 and is separated nearly same distance from the side walls of the pressure tank 17, which are positioned near the vacuum valve 9. On the other hand, the movable-side connection conductor 13b is neared to a position in the other longitudinal direction, which is an opposite direction with respect to the vacuum valve 9, and arranged while a necessary insulation distance to the vacuum valve 9 and the side walls is kept. In addition, arrangement positions of the vacuum valve 9 and the movable-side connection conductor 13b, which are neared to each of both sides in the longitudinal direction and arranged, do not represent positions along the longitudinal direction but represent positions in a rough direction.
As described above, in the vacuum circuit breaker according to Embodiment 2, each of the pressure tanks is formed with a nearly ellipsoidal shape viewed from a plane surface and arranged in a state where a longitudinal direction of each of the pressure tanks is inclined in the same direction, viewed from a plane surface, with respect to an arrangement direction of each of the pressure tanks, and the vacuum valve is arranged in each of the pressure tanks in a state where a drive direction of the movable conductor is aligned with an upper-lower direction, and the movable conductor is positioned lower than the vacuum valve, so that a size of the pressure tank, viewed from an arrangement direction, in a width direction can be reduced while insulation performance of units in the pressure tank is maintained, whereby an installation area of the vacuum circuit breaker can be reduced. Moreover, because the pressure tank has an ellipsoidal shape, a strength of the pressure tank according to Embodiment 2 can be more increased than a strength of the pressure tank having a nearly square shape according to Embodiment 1, and durability of the pressure tank can be increased.
Furthermore, the vacuum valve is neared to a position in one of longitudinal directions of the pressure tank having a nearly ellipsoidal shape and arranged in such a way that a center position of the vacuum valve is separated nearly same distance from side walls of the pressure tank, which are positioned near the vacuum valve, and the movable-side connection conductor is neared to a position in the other longitudinal direction and arranged (so as to be arranged), so that the above-described size can be reduced.
As illustrated in
Moreover, when the pressure tank 1 is composed within a circuit breaker room 7, and the operation mechanism room 8 is formed as a separate room at outside of the circuit breaker room 7, space under the pressure tank 1 can be reduced.
In addition, the pressure tank 1 may be replaced by the pressure tank 17 having a nearly ellipsoidal shape viewed from a plane surface according to Embodiment 2 of the present invention.
As described above, in the vacuum circuit breaker according to Embodiment 3, the operation mechanism is arranged at a position, which is lower than the vacuum valve and displaced from a directly lower position of the vacuum valve, and linked to the movable conductor of the vacuum valve via an insulation rod and a conversion lever for converting a drive direction in a 90-degree angle, so that an effect of the vacuum circuit breaker according to Embodiment 3 is added to an effect of the vacuum circuit breaker according to Embodiment 1 or Embodiment 2, and space for the vacuum circuit breaker can be reduced by effectively using lower side space in the pressure tank or lower outside space of the pressure tank.
As illustrated in
In addition, the operation mechanism 10 is not limited to the magnet coil system illustrated in
As described above, in the vacuum circuit breaker according to Embodiment 4, the operation mechanism is configured in such a way that the operation mechanism is arranged at a lower outside of the pressure tanks, which is positioned in an arrangement end portion, and a link shaft, which is horizontally extending in an arrangement direction of each of the pressure tanks, is provided at a lower position of the vacuum valve, and moreover, an end portion of the link shaft is linked to the operation mechanism, and the movable conductor of the vacuum valve is connected to the link shaft via an insulation rod and a conversion lever, whereby a drive force for driving the link shaft by the operation mechanism is transmitted to the movable conductor of the vacuum valve corresponding to each phase via the conversion lever, and the movable conductor is driven in an upper/lower direction, so that an effect for reducing a size of the pressure tank in a width direction is added, and an open-close operation the vacuum valve corresponding to each phase can be totally controlled by one operation mechanism, whereby the operation mechanism is not needed in each of the pressure tanks.
Moreover, space for the vacuum circuit breaker can be reduced by effectively using lower side space in the pressure tank or lower outside space of the pressure tank.
Number | Date | Country | Kind |
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2010-069843 | Mar 2010 | JP | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/JP2010/063873 | 8/17/2010 | WO | 00 | 5/16/2012 |
Publishing Document | Publishing Date | Country | Kind |
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WO2011/118056 | 9/29/2011 | WO | A |
Number | Name | Date | Kind |
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6784392 | Piazza et al. | Aug 2004 | B1 |
8110770 | Ichikawa et al. | Feb 2012 | B2 |
20100288733 | Ichikawa et al. | Nov 2010 | A1 |
Number | Date | Country |
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1728312 | Feb 2006 | CN |
5-083978 | Nov 1993 | JP |
09-147698 | Jun 1997 | JP |
9-147698 | Jun 1997 | JP |
2002-199522 | Jul 2002 | JP |
2003-319515 | Nov 2003 | JP |
2007-306701 | Nov 2007 | JP |
Entry |
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Office Action (Patent Examination Report No. 2) issued on Mar. 13, 2014, by the Australian Patent Office in corresponding Australian Patent Application No. 2010349157. (4 pages). |
International Search Report (PCT/ISA/210) issued on Sep. 14, 2010, by the Japanese Patent Office as the International Searching Authority for International Application No. PCT/JP2010/063873. |
Chinese First Office Action dated Jun. 26, 2014 issued in the corresponding Chinese Patent Application No. 201080064890.2 and English translation (9 pages). |
Number | Date | Country | |
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20120228266 A1 | Sep 2012 | US |