The present invention relates to a switchgear and a switchgear assembling method, and more particularly, to a switchgear with improved assembly workability upon production and on-site assembling.
In recent years, as a countermeasure against the global warming issue, a high voltage switchgear without sulfur hexafluoride gas (SF6 gas) attracts attention. There are various types of insulation methods such as compressed air insulation in which a tank is filled with high-pressure dry air, vacuum insulation mainly using vacuum as insulating medium, and solid insulation in which epoxy resin is filled around a high voltage member.
Generally, the structure of the switchgear is divided into three types: a feeder panel for feed to a load; a bus section panel to separate a bus; and a bus tie panel to connect two buses. Each section is of single-bus type or double-bus type in correspondence with the number of buses.
The main circuit parts in these switchgears respectively have a combination of a breaker, a disconnector, a grounding switch and a bus. More particularly, a circuitry described in, for example, Patent Literature 1 is known. In Patent Literature 1, various switchgear circuitries are realized by combining a solid insulation type breaker, a disconnector and a grounding switch.
Patent Literature 1: Japanese Patent Application Laid-Open No. 2007-306791
As described above, as plural switches such as a breaker, a disconnector and a grounding switch each are connected and arranged inside the switchgear, improvement in on-site assembly workability is required. Especially, since buses and cables are built when the respective switchgears have been set into a row board (plural switchgears are arrayed) status, the working space is limited, and improvement in on-site workability is required. Further, in the case of a double-bus type switchgear, the number of switches is increased for connection with two pairs of buses, and the working space is further limited.
Therefore, the present invention has an object to provide a switchgear capable of improving assembly workability and a switchgear assembling method.
To solve the above problems, a switchgear according to the present invention comprises: a plurality of switch units having a stationary electrode, and a movable electrode opposite to the stationary electrode and driven in a horizontal direction into contact with or opened from the stationary electrode; a plurality of operation mechanisms that operate the movable electrode in the plurality of switch units; a bus connection member, provided in the switch unit, and connected to a bus; and a casing accommodating all the bus connection member, the plurality of switch units and the plurality of operation mechanisms, wherein the plurality of switch units are provided in a height direction, and wherein the plurality of operation mechanisms are provided on a front surface side or a rear surface side of the casing, further wherein the plurality of bus connection members are provided on the other side of the casing.
Further, an assembling method for a switchgear, according to the present invention, having: a plurality of switch units having a stationary electrode, and a movable electrode opposite to the stationary electrode and driven in a horizontal direction into contact with or opened from the stationary electrode; and a plurality of operation mechanisms that operate the movable electrode in the plurality of switch units, comprises: a step of fixing the switch unit with respect to a base so as to set a driving direction of the movable electrode as a height direction; a step of, after fixing of the switch unit, setting the movable electrode upright so as to set the driving direction to the horizontal direction; and a step of, after the above step, connecting the operation mechanism to the plurality of switch units.
According to the present invention, it is possible to provide a switchgear capable of improving assembly workability and a switchgear assembling method.
Hereinbelow, preferred embodiments of the present invention will be described using the drawings. Note that the following description merely shows an example of implementation, but is not intended to limit the subject matter of the invention to the following particular aspects. It goes without saying that it is possible to modify the invention in other various forms than the following embodiments.
Embodiment 1 will be described using
The switch is formed by assembling plural switch units. More particularly, it is formed with one breaker unit 2 provided in a bottom part and three disconnector units 3, 4 and 5 arrayed on the upper side in a height direction of the breaker unit 3. The respective units are interconnected with two types of connecting members 6 and 7. The connecting member 6 is a member to connect disconnector units. The center disconnector unit 4 is used as a grounding switch to be described below. As the interval between the disconnector units is narrowed, the length of the connecting member 6 is short in comparison with the connecting member 7. The connecting members 6 and 7 are formed by covering the periphery of a conductor with insulating material such as resin. A bushing 10 is connected to the disconnector unit 4, and the bushing 10 is grounded E (earthed). That is, the disconnector unit 4 functions as a grounding switch. Note that in a normal operation status, the bushing 10 is grounded as described above. However, it is separated from the earth in accordance with necessity, and is available as a withstand-voltage test terminal for a cable 11.
A first bus A is connected to the disconnector unit 3, and a second bus B is connected to the disconnector unit 5, respectively. Two types of connecting members 13 and 14 are used for connection between the respective units and the buses. The connecting member 13 has a linear shape, and the connecting member 14 is curved so as to avoid spatial interference by phase. In the present embodiment, with respect to a V phase bus having an intermediate height, the remaining U phase and W phase buses are provided above and below in symmetrical positions with respect to the V phase bus. By aligning the positions of the V phase (the three phases are referred to as U phase, V phase and W phase) of the disconnector units 3 and 5 and the V phase of the buses A and B in the height direction, and by providing the U phase and W phase in symmetrical positions with respect to the V phase, only one type of connecting member 14 is curved.
The cable 11 to supply electric power to the load is connected to the stationary side of the breaker unit 2 via a cable head 12. In the present embodiment, an example where two cables are connected so as to ensure a current capacity is shown. Of course, the number of cables is not limited to two. It is possible to change the number of cables in correspondence with installation environment.
As described above, the incoming panel and the feeder panel are formed by mutually connecting the breaker unit 2, the disconnector units 3, 4 and 5, the cable 11 and the buses A and B.
The breaker unit 2 and the disconnector units 3, 4 and 5 are provided such that their movable parts are driven in a horizontal direction with respect to the switchgear 1, and the units are arrayed in a height direction of the switchgear 1. An operation mechanism to drive the movable parts, i.e., a breaker unit operation mechanism 8 and a disconnector unit operation mechanism 9 are provided on the front side of the switchgear 1 so as to be accessible for the operator. Note that an openable/closable cover 100 is attached to the front side.
Next, the breaker unit 2 will be described using
The breaker unit 2 has a stationary electrode 15 and a movable electrode 16 opposite to the stationary electrode 15 and horizontally driven to contact with or opened from the stationary electrode 15 in a vacuum valve having vacuum-sealed inside. The stationary electrode 15 is connected to a stationary conductor 30 extending in the horizontal direction on the rear surface side. The movable electrode 16 is connected to a movable conductor 26 extending in the horizontal direction on the front surface side. The stationary conductor 30 of the vacuum valve 21 is connected to the bushing 10 for connection to the cable head 12. The bushing 10 is formed with a porcelain tube 70 and a central conductor 71. The central conductor 71 is provided with a band contact 72 for electrical continuity with the stationary conductor 30. Note that in the present embodiment, as described later, since the breaker unit is provided only in a connection part with the cable, the breaker unit is connected to the bushing 10. However, it may be connected with the connecting member 13. The structure of the present embodiment has compatibility to easily change the connection to the bushing 10 and the connection with the connecting member 13 in correspondence with installation environment. That is, the breaker unit 2 and the disconnector units 3, 4 and 5 have the structure of the connecting member in common.
The movable conductor 26 has a bellows between the movable conductor and a vacuum vessel, to maintain the hermeticity in the vacuum vessel while allow movability of the movable conductor 26. The movable conductor 26 extends from the inside of the vacuum vessel to the outside of the vacuum vessel, and fixes a member 27 outside the vacuum vessel. A band contact 28 for collecting with respect to the conductors 24 and 25 is provided on the periphery of the member 27. Further, an insulating rod 29 is connected to a front side end of the movable conductor 26, and the insulating rod 29 itself is driven in the horizontal direction with the breaker unit operation mechanism 8. The movable conductor 26 and the movable electrode 16 are also driven in the horizontal direction in accordance with the movement of the insulating rod 29 in the horizontal direction.
In the breaker unit 2, resin 22 such as epoxy for insulation is molded around the vacuum valve 21, and its external surface is covered with conductive coating material 23. The conductive coating material 23 has the ground potential to ensure contact safety for people with respect to this part.
The two conductors 24 and 25 are provided in upper and lower positions of a side surface (height direction) of the breaker unit 2. The conductor (the conductor 25 in
When the bushing 10, the connecting members 6 and 7, the connecting members 13 and 14 and the insulating cover 123 are fixed to the switch unit (the breaker unit 2 or the disconnector unit), a rubber ring 73 is held between the switch unit and the bushing 10, the connecting members 6 and 7, and the insulating cover 123. The rubber ring 73 is used to ensure insulation between the central high voltage member and the peripheral earth, and is formed with silicone rubber, EP rubber or the like. The connecting member 6, on the assumption that the switch units are vertically connected, has a vertically line-symmetric shape with respect to the horizontal axis (on the assumption that the switch unit has upper and lower connecting members having the same shape. It goes without saying that when the switch unit is formed with upper and lower connecting members in different shapes, it is necessary to change the connecting member 6 to have a shape to be engaged with the switch unit). Regarding the bushing 10, the connecting member 7, the connecting members 13 and 14, and the insulating cover 123, the surface opposite to the surface on the side connected to the switch unit is a flat member 17. They are stationary with fastening members such as bolts from the flat member 17 via the rubber ring 73 to the switch unit.
In the present embodiment, the bushing 10 connected to the breaker unit 2 is connected to the cable head 12 on the rear surface side of the switchgear 1 and is connected to the cable 11.
Next, the structure of the disconnector unit 3 will be described using
In the disconnector units 3, 4 and 5, since it is not necessary to have current breaking performance as long as they have a surge withstand voltage upon opening, they have, not the vacuum valve, but an air switch 41, and have a stationary conductor 51 which also functions as a stationary electrode, and a movable conductor 46 extending in the horizontal direction. The conductor 46 has a band contact 48, corresponding to a movable electrode, which is opposite to the stationary conductor 51 and is driven in the horizontal direction into contact with or opened from the stationary conductor 51. The stationary conductor 51 of the air switch 41 is connected to a central conductor 52 provided at the center of the connecting member 13. The central conductor 52 is provided with a band contact 53 for electrical continuity with the stationary conductor 51. Note that in the present embodiment, the connecting member 13 which extends in the horizontal direction on the rear surface side is described as a representative element, however, the connecting member 14 in place of the connecting member 13 may be connected. Actually, among the three U, V and W phase buses, with respect to the bus having an intermediate height (the V phase surface in the present embodiment), the remaining two phases (the U phase and the V phase) are provided above and below in symmetric positions with respect to the V phase bus having the intermediate height. They do not extend straight in the horizontal direction but need to be curved, therefore, regarding the U phase and the W phase, the connecting member 14 is connected. Further, when it is used as a grounding switch, the bushing 10 in place of the connecting member 13 is connected. In the structure of the present embodiment, to easily change the connection to the bushing 10 and the connection to the connecting members 13 and 14 in correspondence with installation environment, it has compatibility. That is, the structure of the connection member is commonalized among the respective switch units of the breaker unit 2 and the disconnector units 3, 4 and 5.
In the disconnector unit, as in the case of the breaker unit 2, resin 42 such as epoxy for insulation is provided around the air switch 41, and its exterior surface is covered with conductive coating material 43 for grounding. Two conductors 44 and 45 are provided on the side surface of the disconnector unit. The conductors 44 and 45 are engaged with the connecting member 6 and the connecting member 7, to ensure electrical continuity among the units (In
The movable conductor 46 extending in the horizontal direction has a band contact 49 for collection with respect to the conductors 44 and 45 on the periphery of the movable conductor 46, on the front side. Further, an insulating rod 50 is connected to the front side end of the movable conductor 46, and the insulating rod 50 itself is driven in the horizontal direction with the disconnector unit operation mechanism 9. The movable conductor 46 and the band contact 48 are also driven in the horizontal direction in accordance with the operation of the insulating rod 50 in the horizontal direction.
When the bushing 10, the connecting members 6 and 7, the connecting members 13 and 14 and the insulating cover 123 are fixed to the disconnector unit, the rubber ring 73 is held between the disconnector unit and the bushing 10, the connecting members 6 and 7 and the insulating cover 123. The rubber ring 73 is used to ensure insulation between the central high voltage member and the peripheral earth. It is formed with silicone rubber, EP rubber or the like. It is assumed that the switch unit is connected to the upper and lower parts of the connecting member 6, and it has a line-symmetrical shape with respect to the horizontal axis (it is assumed that the switch unit has upper and lower connection members having the same shape. When the switch unit is formed such that the shapes of the upper and lower connection members are different from each other, it goes without saying that it is necessary to change the connecting member 6 to have a shape to be engaged with the switch unit). Regarding the bushing 10, the connecting member 7, the connecting members 13 and 14 and the insulating cover 123, the surface opposite to the surface on the side connected to the switch unit is the flat member 17. They are fixed with fastening members such as bolts from the flat member 17 via the rubber ring 73 to the switch unit. The connection member is basically similar to that of the above-described breaker unit. Since they are similar to each other, they have compatibility and easily replaced with another unit.
In the present embodiment, the connecting members 13 and 14 are connected to the double buses A and B on the rear surface side of the switchgear 1.
Here the method for assembling the switchgear 1 according to the present embodiment will be described using
When the breaker unit 2 and the disconnector unit 3, 4 and 5 have been assembled, as shown in
It is necessary to fix the buses A and B and the cable 11 on site. The method for fixing the buses A and B and the cable 11 on site is shown in
The movable members of the breaker unit 2 and the disconnector units 3, 4 and 5 forming the switchgear 1 are provided to be driven in the horizontal direction, and the units are arrayed in the height direction of the switchgear. Further, when the principal circuit part is assembled, the switchgear 1 is laid over the sideways. With this structure and the method, it is possible to attach each of the members without working against the gravity. It is possible to improve the assembly workability, and it is advantageous in reduction of the number of steps, i.e. economic efficiency.
According to the present embodiment, since the plurality of switch units having movable electrodes driven in the horizontal direction are arrayed in the height direction (not in spatially twisted positions but in parallel), the operation mechanisms are collectively provided on one side of the switchgear casing, and the connection members for the buses and the cables are collectively provided on the other side of the casing, the connection members for working on site are in positions easily accessible to the operator from the rear surface side of the casing. Thus the workability is improved.
Further, in the present embodiment, the breaker unit and the disconnector unit have compatibility of the connection members for the various types of bushing 10, connecting members 6 and 7, connecting members 13 and 14, insulating cover 123 and the like, and it is possible to easily change the combination in correspondence with installation environment. That is, the commonality of connection between the buses and mutual units is achieved, and various circuitries are easily realized. More particularly, the connection members in the breaker unit and the disconnector unit for the connecting members have a common structure.
Further, in the present embodiment, with respect to the V phase bus having an intermediate height, the remaining two phase buses are provided above and below in positions symmetrical to the V phase bus having the intermediate height. The structure of the connecting member 14, which becomes a connection member for the U phase and W phase buses provided above and below with respect to the V phase bus provided at the intermediate height, is commonalized as one type structure. Accordingly, it is possible to further improve the versatility of the member.
Further, since the buses A and B are also arrayed in the height direction on the rear surface side of the switchgear 1, it is possible to easily perform the attachment of the bus on site.
Note that the present embodiment has been described with the double-bus type switchgear as an example, however, it is possible to form a single-bus type switchgear with a combination of the bus A, the breaker unit 2 and the disconnector units 3 and 4.
Embodiment 2 will be described using
In the present embodiment, a case where the disconnector unit in a double-bus type switchgear has current breaking performance when, e.g., a loop current breaking duty is required of the disconnector, will be described.
As described in Embodiment 1, the breaker unit 2 and the disconnector unit 3 have a commonalized structure for connection with various connection members, thus have compatibility. Accordingly, the disconnector connected to each of the first bus A and the second bus B (although it is necessary that the disconnector is compliant with the disconnector standards) is basically obtained by replacing the disconnector unit 3 with the breaker unit 2. In this manner, in correspondence with the user's purpose, it is possible to adopt the circuitry in
Embodiment 3 will be described using
The present embodiment is an example where bus section panel is realized in a double-bus type switchgear. The bus section panel is formed with left and right switchgears in a row-board structure as shown in
The bus section panel is provided with, in place of the cable 11 provided in the incoming panel and the feeder panel, a communication bus C to connect the left and right switchgears. Since connection is made with the communication bus C, it is not necessary that the two switchgears are provided with the breaker unit, as long as one switchgear is provided with the breaker unit. In the structure shown in
Further, in the switchgear applied to the bus section panel, as it is not a double-bus type using the above-described buses A and B (except the communication bus C), and one disconnector unit can be omitted.
Note that when the switchgear is formed as in the case of the present embodiment, since the connection structure of the connecting members 13 and 14 and the bushing 10 with respect to the breaker unit 2 and that with respect to the disconnector unit 3 are commonalized, the connection structure between the communication bus C and the breaker unit 2 is made with the same members as those of the connection structure with respect to the buses A and B. Note that as described above, the breaker unit 2 is not necessary in the right side switchgear, and the disconnector unit 103 is utilized for connection. It is not necessary to operate the movable conductor 81 and the movable conductor is fixed inside. That is, regarding the disconnector unit 103, the operation mechanism is not necessary.
That is, it is possible to easily assemble the bus section panel using the switchgear described in the above-described embodiments.
Embodiment 4 will be described using
The present embodiment is an example where a bus tie panel is realized in a double-bus type switchgear. The bus tie panel is formed with left and right switchgears in a row-board structure as shown in
Also in the present embodiment, since the connection structure of the connecting members 13 and 14 and the bushing 10 with respect to the breaker unit 2 and that with respect to the disconnector unit 3 are commonalized, the connection structure between the communication bus C and the breaker unit 2 is made with the same members as those of the connection structure with respect to the buses A and B.
That is, it is possible to easily assemble the bus tie panel using the switchgear as described in the above-described embodiments.
Note that the combinations described in the above-described embodiments is an example, and it is also a good merit of the present invention that other various combinations are realized in correspondence with installation environment.
Number | Date | Country | Kind |
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2012-123889 | May 2012 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2013/063895 | 5/20/2013 | WO | 00 |