TWI445268B - Switchgear - Google Patents

Description

Switch

The present invention relates to a switch having a double bus bar, and more particularly to a switch having a double bus bar formed of a solid insulated bus bar.

Power plant equipment is highly important in factories such as factories or hospitals that produce computer-related equipment, and is required to provide stable power supply under various loads.

In order to improve the reliability of power supply, a switch for a high-voltage power receiving device of such a mechanism has a double bus type switch that can shorten the power-off time to the load even in the event of an accident (for example, refer to the patent) Document 1). For example, by charging one of the finger busbars with electric power received from the electric power company, the other bus bar is charged with the received electric power from the electric power generating equipment or the like, and even if the electric power supply from the electric power company is interrupted due to an accident such as lightning strike, It is also possible to continue to supply power to the load by switching to the other bus.

[Previous Technical Literature]

[Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. Hei 6-311614

The above-mentioned switch includes: an upper circuit breaker connected to the upper bus bar on one side, a lower circuit breaker connected to the lower bus bar on one side, and another switch connected to the other side of the lower circuit breaker and the upper circuit breaker The side interrupter; the interrupter is accommodated between the upper circuit breaker and the lower circuit breaker, so that, for example, in the event of an accident in the upper busbar or the upper circuit breaker, the upper circuit breaker can be opened, through the lower circuit breaker and the lower portion. The busbar and the breaker supply power to the load. As a result, it is possible to reduce the time during which the power supply to the load is stopped due to the accident of the circuit breaker or the conductor on one side.

However, in order to ensure safety, in order to ensure safety, the upper busbar and the lower busbar must be powered off during the night when the load is stopped or during regular maintenance. Further, in many cases, the inspection work of each of the devices constituting the switch body is performed after the upper bus bar and the lower bus bar are powered off in order to ensure the safety of the work in the casing.

In short, under the aforementioned conditions, it is necessary to stop supplying power to the load, and it is difficult to shorten the power failure time.

In a switch having such a double bus, it is expected that a permanent repair operation after an internal accident can be performed without stopping the supply of power to the load, and a switch that can perform inspection of each device in the casing is also expected.

The present invention has been made in view of the above-described problems, and an object of the invention is to provide a switch having a double bus bar that can be implemented without checking the power supply to the load, or to check the operation of each of the devices in the casing. Device.

In order to achieve the above object, the switch of the first aspect of the present invention is a switch having a double bus bar in which a main bus bar is disposed in a vertical direction, and includes a machine room and a partition formed on the front side by a grounded metal plate. The casing of the side busbar chamber is placed in the upper and lower portions of the casing in the casing, and is disposed in the width direction of the casing, and the conductor is covered with a solid insulator so that the surface is the ground potential and the upper main busbar and the lower portion. The main bus bar is disposed in the machine room, and has a breaker opener unit that is connected to the upper main bus bar via one of the contact bus bars insulated by the solid, and is disposed in the machine room, and is insulated by solid insulation. The contact busbar is connected to the shutter lower unit of the lower main busbar on one side, and is disposed in the busbar chamber, and one end is connected to the other side of the upper shutter unit and the lower shutter. The other side of the unit is connected to the solid insulated pull-out busbar of the cable; the upper part is opened and closed The breaker of the unit and the breaker of the lower shutter unit are electrically connected in series between the upper main bus and the lower main bus.

According to a second aspect of the invention, in the first aspect of the invention, the plurality of the shutters of the upper shutter unit are electrically connected in parallel to the upper main bus bar, and the plurality of lower shutter units are connected by a disc configuration. The interrupter is electrically connected in parallel to the lower main bus.

According to a third aspect of the invention, in the first or second aspect of the invention, the contact bus bar and the pull-out bus bar are also covered with a solid insulator so that a surface potential thereof is a ground potential.

Further, according to a fourth aspect of the invention, the solid insulating material is a silicone rubber.

Further, the fifth invention is characterized by any one of the first to fourth inventions, wherein the solid insulator is an epoxy resin.

According to the present invention, since one of the solid insulated bus bars is disposed on the upper side of the casing, and the other solid insulated bus bar is disposed on the lower side of the casing and has a double bus bar switch, it is possible to provide a small size. Light weight ‧ High reliability, it is possible to perform maintenance of each machine of the casing or work related to one bus, and the switch is implemented without stopping the supply of power to the load.

Hereinafter, an embodiment of the switch of the present invention will be described using the drawings.

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a wiring diagram showing the configuration of an embodiment of a switch of the present invention. In Fig. 1, in one embodiment of the switch of the present invention, the series disk constitutes a switchboard 1 for supplying power to a load, and a double bus type switch having a bus bar wiring in the vertical direction, and each of the switchboards 1 is substantially configured to be included in The upper part of each switchboard 1 is connected to the first bus bar 2 that leads to the adjacent disk, the second bus bar 3 that leads to the adjacent disk to the lower portion of each of the switchboards 1, and the upper busbar 4 that is connected to the first bus bar 2 on one side, and the single block The lower breaker 5 connected to the second bus bar 3, the third busbar 6 connected to the other side of the upper breaker 4 and the other side of the lower breaker 5, and the third connector 6 are connected to the third A power cable 7 of the bus bar 6 that supplies electric power to each load. The upper interrupter 4 and the lower interrupter 5 are electrically connected between the first bus bar 2 and the second bus bar 3, and are formed by a column disk, and the plurality of upper interrupters 4, 4, ‧ ‧ is electrically connected in parallel to the first bus bar 2, and the plurality of lower interrupters 5, 5, ‧ ‧ are electrically connected in parallel to the second bus bar 3

In the normal operation, for example, the first bus bar 2 and the second bus bar 3 are charged by a power source from a different system, and one of the upper breaker 4 and the lower breaker 5 is supplied to supply electric power to the load. When the power supply from the one-way system is stopped, the one busbar is powered off, but the breaker connected to the busbar on the power-off side is released, and the breaker connected to the busbar on the charging side is input, and the load can be continuously supplied. electric power.

In the present embodiment, the bus bar members of the first bus bar 2, the second bus bar 3, and the third bus bar 6 are solid insulated bus bars having the same specifications as the ground potential by the outer peripheral portion of the solid insulator insulated bus bar conductor.

Next, an embodiment of the switch of the present invention will be described in detail using Figs. 2 to 4 .

2 to 4 are views showing an embodiment of the switch of the present invention, FIG. 2 is a longitudinal sectional view showing an embodiment of the switch of the present invention, and FIG. 3 is a view showing the present invention shown in FIG. A schematic wiring diagram of one embodiment of the switch, and Fig. 4 is a rear view showing an embodiment of the switch of the present invention.

2 and 3, the housing 11 of the switch is partitioned into a front side and a back side by a partition 12 of a grounded metal plate, and a busbar chamber 16 is formed on the back side (the left side of FIG. 2). The upper side and the lower side of the busbar chamber 16 are further divided into upper busbar chambers 16A and lower busbar chambers 16B by the covers 13, 13. On the other hand, on the front side (the right side in FIG. 2), the two machine rooms 15 and 15 are formed by partitioning the sealing covers 14 and 14. The purpose of the sealing cover 14 is mainly to prevent an electric shock accident from a charging unit such as a shutter from being caused by an operator or the like. Further, when the rubber pad or the like is attached to the sealing cover 14, the machine room 15 can be made dust-proof. As a result, labor saving of the cleaning of the machine room 15 can be achieved. A front door 11A that can be opened and closed is provided on the front side of the casing 11, and a rear door 11B that can be opened and closed is provided on the back side. Further, between the machine rooms 15, 15 and the back side of the front door 11A, the control room 17 is partitioned. At the front door 11A, a protection controller 26 is mounted.

At the bottoms of the machine rooms 15, 15 respectively, approximately rectangular support plates 18, 18 are provided which are disposed on the inner sides of the partition plate 12 and the casing 11 so that the three sides of the outer circumference are fixed. On the support plates 18 and 18, two shutter units 19 and 19 are placed, respectively. The shutter unit 19 is configured by a shut-off portion 21a of a vacuum interrupter (VCB) 20 that blocks current interruption of the power supply circuit, and an operator 21 of the vacuum interrupter 20 that performs opening and closing operations of the blocking portion 21a. The current transformer (CT) 22 of the terminal on the load side of the vacuum interrupter 20 and the zero-phase current transformer (ZCT) 23 of the terminal disposed on the power supply side of the vacuum interrupter 20 are formed.

The two shutter units 19, 19 have front covers 41 on the respective front sides (the right side of Fig. 1). In the front cover 41, a rod-shaped pull-out handle 25 is attached to the center in the vertical direction. The two shutter units 19 and 19 are mounted on the flatbed cart 24, respectively. Further, in the flatbed vehicle 24, a frame 27 is erected so as to cover the outer periphery of the front side and the three sides of the vacuum interrupter 20 and the manipulator 21 in the upper portion thereof. The frame 27 is equipped with a current transformer 21 and a zero-phase current transformer 22.

The vacuum interrupter 20, the current transformer 22, and the zero-phase current transformer 23 constituting the aforementioned shutter unit 19 are connected in series as shown in FIG. The zero-phase current transformer 23 is disposed on the power supply side of the vacuum interrupter 20, and the current transformer 22 is disposed on the load side of the vacuum interrupter 20.

As shown in FIG. 2, the back end of the shutter unit 19 is disposed with a terminal 28 connected to the movable electrode side (lower side) of the vacuum interrupter 20 and a fixed electrode side (upper side) connected to the vacuum interrupter 20. Terminal 29. The terminals 28 and 29 are connected to the contact bus bar 31 of the main bus bar 30 and the auxiliary contact bus bar connected to the bus bar chambers 16A and 16B of the upper and lower bus bars 16 to be described later, through the air-insulated road insulating bushing. 32.

In Fig. 2, in the upper and lower busbar chambers 16A, 16B, the three-phase solid-insulated upper main busbar 30A and the lower main busbar 30B are transmitted through the connection adapters 34, 34 as connection members, respectively. The front faces of the casings 11 are parallel (in Fig. 2, the direction orthogonal to the paper surface). The upper and lower main bus bars 30A, 30B are connected to one end of the solid insulated contact bus bars 31, 31 via the connection adapters 34, 34. The other end of the contact bus bar 31 is divided into a connection terminal 31a on one side and a connection terminal 31b on the other side. The connection terminal 31a on the other side of the communication bus bar 31 connected to the upper main bus bar 30A is introduced into the machine room 15 so as to be detachable from the terminal 29 of the upper shutter unit 19. The connection terminal 31b connected to one of the contact bus bars 31 of the lower main bus bar 30B is introduced into the machine room 15 so as to be detachable from the terminal 28 of the lower shutter unit 19.

Further, on the lower side of the upper bus bar chamber 16A and on the upper side of the lower bus bar chamber 16B, the auxiliary contact bus bar 32 insulated by solid is disposed. In the auxiliary contact bus bar 32, a connection portion 32a to which a connection terminal 33a of one end of the pull-out bus bar 33 is connected is formed in the intermediate portion, and connection terminals 32b and 32c that can be separated from the terminals of the shutter unit 19 are formed. Both ends. The connection terminals 32b and 32c of the auxiliary communication busbar 32 are respectively introduced into the machine room 15 so that the lower terminal 28 of the shutter unit 19 of the above stage and the upper terminal 29 of the lower shutter unit 19 can be separated from each other. Further, a solid insulated pull-out bus bar 33 is disposed at the rear of the auxiliary contact bus bar 32. One end of the pull-out bus bar 33 is provided with a connection terminal 33a which is connected to the connection portion 32a of the aforementioned auxiliary contact bus bar 32. The other end of the pull-out bus bar 33 is connected to the cable head 38 to which one end of the cable 39 is connected. The other end of the cable 39 is pulled out below the casing 11, and is connected to the load.

Each of the upper main bus bar 30A, the lower main bus bar 30B, the contact bus bar 31, the auxiliary contact bus bar 32, and the pull-out bus bar 33 is formed by coating a copper conductor with a solid insulator such as silicone rubber or epoxy resin. Conductive coating, at the same time as the ground potential. These busbars are gas-free by such insulation, and do not require gas management, so that operability is improved, and even if dust or foreign matter is mixed into the busbar chamber 16, safety can be ensured while maintaining insulation, and the safety can be saved. Maintenance and seeking labor for maintenance.

Further, in the present embodiment, the shutter units 19 and 19 of the upper and lower stages are disposed between the upper main bus bar 30A and the lower main bus bar 30B in the vertical direction. Thereby, for example, even in the case where the main bus bar of the upper or lower side or the shutter unit has an accident, the power supply to the load can be continued, and the repair work of the accident portion can be performed.

The switch, as shown in FIG. 4, shows the column constituting the switch, the upper main bus bar 30A insulated by the solid, the lower main bus bar 30B, the contact bus bar 31, the auxiliary contact bus bar 32, the pull-out bus bar 33, and each The connection state of the back surface of the machine room 15 is set. Here, the width of the casing 11 constituting each disk (the horizontal direction in FIG. 4) is formed to be about 600 mm, and it is possible to reduce the size and weight. Further, the array disk constitutes a connection between the upper main bus bar 30A and the lower main bus bar 30B, and is a T-shaped connection adapter in which one of the main bus bars 30A, 30B extending from the adjacent disk is connected in the horizontal opening. 34 to carry out. Moreover, the insulation specification of the solid insulated bus bar 30 is rated voltage of 24 kV, which improves safety and reliability, and does not require work such as cleaning of the bus bar.

Next, the details of the shutter unit 19 constituting the switch of the present invention will be described with reference to FIG. Fig. 5 is a longitudinal side view showing an opening and closing unit constituting one embodiment of the switch of the present invention. In FIG. 5, since the same reference numerals are given to the same reference numerals as those in FIGS. 1 to 4, detailed description thereof will be omitted.

The vacuum interrupter 20 constituting the shutter unit 19 is mounted on a flatbed 24 having four wheels, an operator 21 disposed on the front side of the flatbed 24, and three insulations disposed at the rear thereof. The block 40 is formed by the blocking portion 21a. A front cover 41 is provided on the front surface of the operator 21, and a rod-shaped pull-out handle 25 is attached to the center in the vertical direction.

In the blocking portion 21a of the vacuum interrupter 20, for example, three fixed electrode side terminals 29 are horizontally mounted on the upper side, and three movable electrode side terminals 28 are horizontally mounted on the lower side.

In the upper portion of the frame 27, the current transformers 22 and 22 respectively covering the two-phase fixed electrode side terminals 29 of the three phases are mounted, and the movable electrode side of the three phases is covered with one iron core at the lower portion. Runway-shaped zero-phase current transformer 23 of terminal 28. Further, on the side portion of the frame 27, the semi-elliptical notches 46 are provided in two places in the vertical direction. This is to avoid the purpose of providing a reduction in insulation performance due to the provision of the frame 27 on the outer circumference of the vacuum interrupter 20.

Next, the operation of the machine in the casing of the above-described switch of the present invention at the time of inspection will be described with reference to FIG. Fig. 6 is a wiring diagram for explaining an operation at the time of machine inspection in an embodiment of the switch of the present invention. In FIG. 6, since the same reference numerals are given to the same reference numerals as those in FIGS. 2 to 4, detailed description thereof will be omitted.

The following describes the case where the upper main busbar 30A of the interleaf of the cross-switch and the shutter unit 19 of the upper section of the specific disc are inspected.

(1) As shown in Fig. 6, the vacuum interrupters 20, 20 and ‧‧‧ which are transmitted through the lower stage are configured by the lower main bus 30B to supply power to the respective loads.

(2) The vacuum interrupters 20, 20, and ‧ ‧ in the upper stage are all in an open state, and the upper main bus bar 30A is in a power-off state.

(3) The shutter units 19, 19, 19‧‧ ‧ of the upper stage of the vacuum interrupter 20 to which the upper stage is disposed are pulled out by the casings 11, 11, and ‧ ‧ and placed at the disconnection position.

(4) The cover 13 of the upper bus bar chamber 16A shown in Fig. 2 is removed, and the upper main bus bar 30A is inspected.

(5) After the inspection is completed, the cover 13 of the upper bus bar chamber 16A is attached, and the restoration operation is performed in the order of (3), (2), and (1).

The solid insulated bus bar is coated with a conductive coating on the surface of the conductor by covering the periphery of the conductor with a solid insulator, so that the surface becomes a ground potential, so that no electric shock accident occurs even if the human body accidentally touches the bus bar. The upper main bus bar 30A, the lower main bus bar 30B, the contact bus bar 31, the auxiliary contact bus bar 32, and the pull-out bus bar 33 are formed by using the solid insulated bus bar, and the high-voltage portion is not exposed.

Therefore, when the upper main busbar 30A or the upper shutter unit 19 is inspected as described above, it is not necessary to open the lower vacuum interrupter 20, and the maintenance work can be performed while the power is continuously supplied to the load. In addition, since the former double bus switch has an insulation distance between the bus bars as compared with a normal switch, it is difficult to reduce the installation space. In the present embodiment, the solid insulated bus bar is used, so that the reduction of the installation space becomes possible.

According to one embodiment of the above-described switch of the present invention, one of the solid insulated bus bars is disposed on the upper side of the casing, and the other solid insulated bus bar is disposed on the lower side of the casing to have a double Since the switch of the busbar is small, it is light, ‧ high reliability, and it is possible to perform maintenance of each machine of the casing 11 or work related to one bus, and to implement the switch without stopping the supply of power to the load. .

Further, according to the embodiment of the above-described switch of the present invention, since the shutter units 19 and 19 of the upper and lower stages are disposed in the middle of the upper main bus 30A and the lower main bus 30B, for example, in the upper and lower directions. When the main busbar of either one of the main busbars or the shutter unit has an accident, the load can be continuously supplied to the load by the single busbar and the shutter unit, and the recovery operation of the accident portion can be performed.

1. . . switchboard

2. . . 1st bus

3. . . 2nd bus

4. . . Upper interrupter

5. . . Lower interrupter

6. . . 3rd busbar

11. . . Casing

12. . . Partition

13. . . cover

14. . . Sealing cover

15. . . Machine room

16. . . Busbar room

17. . . Control room

18. . . Support plate

19. . . Closer unit

20. . . Vacuum interrupter

twenty one. . . Operator

twenty two. . . Converter

twenty three. . . Zero phase converter

twenty four. . . flatbed truck

30. . . Main bus

30A. . . Upper main bus

30B. . . Lower main bus

31. . . Contact bus

32. . . Auxiliary contact bus

33. . . Pull out the busbar

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a wiring diagram showing the configuration of an embodiment of a switch of the present invention.

Fig. 2 is a longitudinal sectional view showing an embodiment of the switch of the present invention.

Fig. 3 is a schematic wiring diagram showing an embodiment of the switch of the present invention shown in Fig. 2.

Figure 4 is a rear elevational view showing one embodiment of the switch of the present invention.

Fig. 5 is a side view showing an opening and closing unit constituting one embodiment of the switch of the present invention.

Fig. 6 is a wiring diagram for explaining an operation at the time of machine inspection in an embodiment of the switch of the present invention.

11. . . Casing

12. . . Partition

13. . . cover

14. . . Sealing cover

15. . . Machine room

16. . . Busbar room

18. . . Support plate

19. . . Closer unit

20. . . Vacuum interrupter

twenty one. . . Operator

twenty two. . . Converter

twenty three. . . Zero phase converter

twenty four. . . flatbed truck

30A. . . Upper main bus

30B. . . Lower main bus

31. . . Contact bus

32. . . Auxiliary contact bus

33. . . Pull out the busbar

16A. . . Upper busbar room

16B. . . Lower busbar room

21a. . . Interrupted part

25. . . Pull out the handle

26. . . Protection controller

27. . . frame

28. . . Terminal on the movable electrode side (lower side)

29. . . Fixed electrode side (upper side) terminal

31a. . . Connection terminal

31b. . . Connection terminal

32a. . . Connection

32b. . . Connection terminal

32c. . . Connection terminal

33a. . . Connection terminal

34. . . Connection adapter

38. . . Cable head

39. . . Cable

41. . . Front cover

Claims (4)

A switch is a switch having a double bus bar in which a main bus bar is disposed in an up-and-down direction, and is characterized in that: a machine room having a land side formed on a front side by a grounded metal plate and a bus bar room formed on a back side side; The upper and lower portions of the casing in the busbar chamber of the casing are disposed in the width direction of the casing, and the conductor is covered with a solid insulator so that the surface is the ground potential and the upper main bus and the lower main bus are disposed. In the machine room, a disconnecting bus unit that is connected to the upper main busbar by one side of the connecting busbar that covers the conductor by a solid insulator and has a surface potential of a ground potential is disposed in the machine room. A disconnector unit that is connected to the lower main busbar by one side of the contact busbar that covers the conductor with a solid insulator and has a surface potential of a ground potential, and is disposed in the busbar chamber, and one end is connected On the other side of the upper shutter unit and the other side of the lower shutter unit, the other end a pull-out busbar that is connected to the cable and covers the conductor with a solid insulator to have a surface potential of a ground potential; and the interrupter of the upper shutter unit and the breaker of the lower shutter unit are electrically connected in series to the foregoing Between the upper main bus and the aforementioned lower main bus. The switch of claim 1, wherein the plurality of interrupters of the upper shutter unit are electrically connected in parallel to the upper main bus, by the plurality of switches, The interrupter of the lower shutter unit is electrically connected in parallel to the lower main bus. The switch of claim 1 or 2, wherein the solid insulator is a silicone rubber. The switch of claim 1 or 2, wherein the solid insulator is an epoxy resin.