JP2017153212A - Switchgear - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress temperature rise in the inside of a switchgear by circulating inside air without taking in outside air.SOLUTION: A cold air chamber 31, a bus bar chamber 32 and equipment chambers 33 and 34 are disposed in an outside housing 21 of a power panel 11a. A bus bar 52 is accommodated in the bus bar chamber 32. Breakers 53 and 54 are accommodated in the equipment chambers 33 and 34. The cold air chamber 31 communicates with the equipment chambers 33 and 34 and circulation fans 71 and 72 are disposed in the cold air chamber 31. The equipment chambers 33 and 34 communicate with the bus bar chamber 32. Power panels 11a-11f that are provided in parallel include cold air chambers 31a-31f and bus bar chambers 32a-32f, respectively, the cold air chambers 31a-31f and the bus bar chambers 32a-32f communicate with each other. Heat dissipation chambers 12a and 12b that are connected to side faces of the power panels 11a and 11f communicate the cold air chambers 31a-31f with the bus bar chambers 32a-32f. Circulation fans 71 and 72 (72a-72f) circulate air in the order of the cold air chambers → the equipment chambers → the bus bar chambers → the heat dissipation chambers → the cold air chambers.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a switchgear.

  For example, power receiving and transformation equipment installed in buildings, factories, and the like includes a switch gear in which a power device such as a circuit breaker connected to a bus extending from a lead-in line to a distribution line is accommodated in a box (housing). In such a power receiving / transforming facility, the temperature of the inside of the box housing the power equipment and the like rises due to the operation of the power equipment and the like. For this reason, some power receiving / transforming equipment includes an air conditioner that circulates a cooling gas to cool the inside in order to suppress an increase in internal temperature (see, for example, Patent Document 1).

JP-T 6-505860

  By the way, in the above facilities, the installation location for using an air conditioner increases, and the cost (initial cost, operation cost) concerning facilities increases. For this reason, it is calculated | required to suppress an internal temperature rise, without using an air conditioner.

  The present invention has been made to solve the above problems, and an object of the present invention is to provide a switchgear that can suppress an internal temperature rise.

  A switchgear that solves the above problem includes a power board that houses at least a bus and a power device connected to the bus in a housing, and a heat radiating chamber that is connected to the side of the power board and that has an outer surface that comes into contact with outside air. The housing includes at least a cold air chamber, a bus bar chamber that accommodates the bus bar adjacent to the cold air chamber, and an equipment room that accommodates the power device, and the cold air chamber communicates with the equipment room. The equipment room is communicated with the bus room, a circulation fan is provided to send air from the cold air room to the equipment room, and the heat radiating room communicates the cold air room and the bus room.

  According to this configuration, air is circulated by the circulation fan in the order of the cold air chamber → the device room → the busbar chamber → the heat radiation chamber → the cold air chamber. The circulating air absorbs heat from the power equipment housed in the equipment room and the bus housed in the bus room and radiates heat in the heat radiating room. For this reason, the rise in temperature inside an apparatus room, a bus-bar room, etc. is suppressed.

  In the switchgear, the busbar chamber is disposed behind the cold air chamber, the device chamber is disposed above the cold air chamber and the busbar chamber, and the cooler chamber and the busbar chamber respectively. It is preferable that the upper equipment chamber communicated with the lower air equipment chamber is provided below the cold air chamber and the busbar chamber and communicated with the cold air chamber and the busbar chamber.

  According to this configuration, the power devices respectively accommodated in the upper device room and the lower device room respectively disposed above and below the bus room can be connected to the buses accommodated in the bus room through a short path. .

In the switch gear, it is preferable that a branch bus chamber in which a branch bus connecting the bus and the power device is accommodated is disposed in the housing.
According to this structure, the heat of the branch bus accommodated in the branch bus chamber is radiated to the bus etc. via the conductor, and the temperature rise in the branch bus chamber is suppressed.

In the above switchgear, it is preferable that the heat dissipation chamber has a cooling fin for cooling the air passing therethrough.
According to this configuration, the temperature of the air passing through the heat radiation chamber is radiated to the outside air by the cooling fin, and the temperature of the air can be lowered.

  The switchgear includes a plurality of the power panels arranged in parallel, and the cooling chambers and the busbar chambers of the plurality of power panels communicated with each other in the plurality of power panels arranged in parallel. It is preferable that the heat radiating chamber is connected to side surfaces of the power board at both ends of the power board.

  According to this configuration, in the plurality of power panels arranged side by side, air is circulated through the equipment room containing the power equipment and the bus room containing the bus bar, and the temperature rise inside is suppressed.

  According to the switchgear of the present invention, it is possible to suppress an internal temperature rise by circulating internal air without taking in outside air.

The schematic front view of a switchgear. (A) is a sectional side view of a switchgear, (b) is a partial plan sectional view of the switchgear.

Hereinafter, an embodiment will be described.
In the accompanying drawings, components may be shown in an enlarged manner for easy understanding. The dimensional ratios of the components may be different from the actual ones or in other drawings. Further, in the cross-sectional view, some components may not be hatched for easy understanding.

  A switchgear 10 shown in FIG. 1 is a power receiving / transforming facility installed outdoors such as in a building or factory. The switch gear 10 has a plurality (six in FIG. 1) of power boards 11a to 11f and two heat radiation chambers 12a and 12b. The plurality of power boards 11a to 11f are juxtaposed in the horizontal direction and connected to each other. The heat radiation chambers 12a and 12b are connected to the side surfaces of the power panels 11a and 11f at both ends, respectively.

  The power boards 11a to 11f are, for example, a power receiving board, a distribution board, an in-house low voltage board, and the like. Each of the power panels 11a to 11f has a structure in which three-phase buses 52 (R, S, T) (see broken lines in the drawing) are horizontally penetrated.

  Fig.2 (a) shows an example of the power panel 11a. This power board is, for example, a distribution board. The distribution line board 11 a has an outer casing 21. Opening doors 23 and 24 for maintenance are provided on the front plate 22 of the outer casing 21. A maintenance door 25 is provided on the back surface of the outer casing 21.

  The outer casing 21 has a plurality of rooms that define the inside of the outer casing 21. In the present embodiment, the distribution board 11a is provided with a cold air chamber 31, a bus bar chamber 32, equipment rooms 33 and 34, and a branch bus bar chamber 35 as respective rooms.

  The cold air chamber 31 and the bus bar chamber 32 are arranged adjacent to each other in the front-rear direction of the distribution board 11a at the center in the vertical direction of the outer casing 21. In the present embodiment, a cold air chamber 31 is disposed at the center in the vertical direction, and a bus bar chamber 32 is disposed behind (on the back side of) the cold air chamber 31. The equipment chambers 33 and 34 are respectively disposed above and below the cold air chamber 31 and the busbar chamber 32. When the device chambers 33 and 34 are distinguished from each other, the device chamber 33 disposed above the cold air chamber 31 and the busbar chamber 32 is referred to as an upper device chamber, and the device chamber 34 disposed below is referred to as a lower device chamber.

  An open / close door 41 for maintenance is provided in front of the cold air chamber 31. An opening / closing door 42 for maintenance is provided on the front surface of the bus bar chamber 32. A three-phase bus (R, S, T) 52 is accommodated in the bus chamber 32. Circuit breakers (VCB) 53 and 54 are accommodated in the equipment rooms 33 and 34, respectively. Maintenance doors 43 and 44 are provided on the front surfaces of the equipment rooms 33 and 34, respectively.

  A circulation fan 71 is disposed between the cold air chamber 31 and the upper equipment chamber 33. The circulation fan 71 is disposed so as to send air (cold air) from the cold air chamber 31 to the upper equipment chamber 33. The upper equipment chamber 33 and the busbar chamber 32 communicate with each other, and a collar 73 is disposed between them. Therefore, the air in the cold air chamber 31 (cold air) is sent to the bus bar chamber 32 via the upper equipment chamber 33 by the circulation fan 71.

  Similarly, a circulation fan 72 is disposed between the cold air chamber 31 and the lower equipment chamber 34. The circulation fan 72 is arranged so as to send air (cold air) from the cold air chamber 31 to the lower equipment chamber. The lower equipment chamber 34 and the bus bar chamber 32 communicate with each other, and an arm 74 is disposed between them. Therefore, the air in the cold air chamber 31 (cold air) is sent to the bus bar chamber 32 via the lower equipment chamber 34 by the circulation fan 72.

  In the branch bus room 35, branch buses 55 and 56 are accommodated. The branch buses 55 and 56 are connected to the three-phase bus (R, S, T) 52 of the bus chamber 32 by bushing or the like. The branch buses 55 and 56 are connected to the circuit breakers 53 and 54 disposed in the equipment rooms 33 and 34 by bushing or the like.

  The branch bus chamber 35 accommodates connection conductors 57 and 58 that connect the circuit breakers 53 and 54 to the distribution cables 65 and 66. The connection conductor 57 is provided with a current transformer (CT) 61 and a zero-phase current transformer (ZCT) 63. Similarly, a current transformer (CT) 62 and a zero-phase current transformer (ZCT) 64 are disposed on the connection conductor 58.

  The branch bus room 35 is formed as one unit, for example, and is fixed to the outer casing 21. The branch bus room 35 is, for example, a completely sealed box. The inside of the branch bus chamber 35 is filled with, for example, dry air at atmospheric pressure. Dry air is injected after the branch bus bar chamber 35 is evacuated. Alternatively, after the exhaust valve provided in the branch bus chamber 35 is opened, high-pressure dry air may be injected into the branch bus chamber 35 to replace the internal air with the dry air.

  A space between the cold air chamber 31 and the equipment chambers 33 and 34 and the outer casing 21 is a control chamber 36. In the control room 36, for example, a control device for operating a digital protective relay or a circuit breaker described later is disposed. For example, the control device is attached to the front plate 22 and the open / close doors 23 and 24 of the outer casing 21. For example, an electronic dehumidifier using the Peltier effect may be disposed in the control room 36.

  A cable room 37 is provided between the branch bus room 35 and the outer casing 21, and distribution cables 65 and 66 for power distribution are provided in the cable room 37. The distribution cables 65 and 66 are connected to the circuit breakers 53 and 54 of the equipment rooms 33 and 34 via the connection conductors 57 and 58 of the branch bus room 35.

FIG. 2B is a schematic plan view showing a part of the switchgear 10.
In addition, in the following description, when distinguishing the member contained in each power board 11a-11f, the code | symbol which each attached "a"-"f" similarly to the code | symbol of each power board is used.

  In the switchgear 10, each of the power boards 11b to 11f has cold air chambers 31b to 31f and bus bar rooms 32b to 32f, similarly to the power board 11a shown in FIG. Moreover, each power board 11a-11f has an equipment room (illustration omitted) in which each electric power equipment was accommodated, and each equipment room is connected to cold air room 31a-31f and bus-bar room 32a-32f. For example, the power receiving panel includes a circuit breaker, a disconnect switch, a ground switch, an instrument transformer, and the like, which are accommodated in corresponding rooms. Circulating fans 72a to 72f are disposed between the cold air chambers 31a to 31f and the equipment room, respectively. Further, spaces 74a to 74f are disposed between the bus rooms 32a to 32f and the equipment room. And the cool air chambers 31a-31f of each power board 11a-11f are mutually connected. Similarly, the bus chambers 32a to 32f of the power boards 11a to 11f are in communication with each other.

  FIG. 2 (b) shows circulation fans 72a to 72f and holes 74a to 74f between the cold air chambers 31a to 31f and the equipment chambers arranged below the bus bar chambers 32a to 32f. The equipment room is disposed above the cold air chambers 31a to 31f and the bus bar chambers 32a to 32f, and the circulation fan and the collar are disposed in the same manner as the circulation fan 71 and the collar 73 of the power panel 11a shown in FIG. .

Next, the operation of the switch gear 10 will be described.
As shown in FIG. 2A, in the power panel 11a, the air in the cold air chamber 31 is sent to the bus bar chamber 32 via the equipment chambers 33 and 34 by the circulation fans 71 and 72 as indicated by arrows 101 and 102. Sent. The air sent to the equipment rooms 33 and 34 absorbs the heat of the circuit breakers 53 and 54 accommodated in the equipment rooms 33 and 34. Thereby, the circuit breakers 53 and 54 are cooled.

  As shown in FIG. 2B, in each of the power panels 11a to 11f, the air in the cold air chambers 31a to 31f is sent from the busbar chambers 32a to 32f by the circulation fans 72a to 72f via the equipment rooms (not shown) of each power panel. 32f. In each of the power panels 11a to 11f, power devices (switches, instrument transformers, etc.) accommodated in the device room are cooled by air.

  And in the power boards 11a-11f provided in parallel, the bus chambers 32a-32f are connected to each other. And the thermal radiation chambers 12a and 12b are connected to the side surfaces of the power boards 11a and 11f at the ends. Therefore, as indicated by arrows 103 and 104, the air in the bus bar chambers 32a to 32f moves in the end direction along the bus bar 52 (see FIG. 1) and reaches the heat radiating chambers 12a and 12b. The air that passes through the bus bar chambers 32a to 32f absorbs the heat of the bus bar 52 and dissipates heat in contact with plate members (steel plates) that form the bus bar chambers 32a to 32f.

  The outer surfaces of the heat radiation chambers 12a and 12b are in contact with the outside air. And the air sent to the thermal radiation chamber 12a, 12b is higher than the temperature of external air. Therefore, the heat of the air is radiated to the inner surfaces of the heat radiation chambers 12a and 12b and the cooling fins 13a and 13b, and the air is cooled. The cooled air is sent from the heat radiation chambers 12a and 12b to the cold air chambers 31a to 31f of the power panels 11a to 11f.

  That is, the circulation fans 71 and 72 (72a to 72f) circulate air from the cold air chamber → the device room → the busbar chamber → the heat radiation chamber → the cold air chamber. The air circulating in this way cools the power equipment in the equipment room and the bus in the bus room, and cools the air that is radiated and circulated to the outside air in the heat radiating room.

  As shown in FIG. 2A, the branch bus chamber 35 accommodates branch buses 55 and 56, connection conductors 57 and 58, current transformers 61 and 62, and zero-phase current transformers 63 and 64. These heats are transmitted to the bus room 32 and the equipment rooms 33 and 34 cooled by the air circulating as described above. Thereby, the branch buses 55, 56, etc. accommodated in the branch bus chamber 35 are cooled.

As described above, according to the present embodiment, the following effects can be obtained.
(1) A cold air chamber 31, a busbar chamber 32, and equipment chambers 33 and 34 are disposed in the housing 21 of the power board 11a. A bus bar 52 is accommodated in the bus bar chamber 32. Circuit breakers 53 and 54 are accommodated in the equipment rooms 33 and 34. The cold air chamber 31 communicates with the equipment chambers 33 and 34, and circulation fans 71 and 72 are disposed. The equipment rooms 33 and 34 communicate with the bus bar room 32. The power panels 11a to 11f provided in parallel have cold air chambers 31a to 31f and bus bar chambers 32a to 32f, respectively, and the cold air chambers 31a to 31f and the bus bar chambers 32a to 32f are in communication with each other. The heat radiating chambers 12a and 12b connected to the side surfaces of the power panels 11a and 11f communicate the cold air chambers 31a to 31f and the busbar chambers 32a to 32f. The circulation fans 71 and 72 (72a to 72f) circulate air in the order of cold air chamber → equipment chamber → busbar chamber → heat radiation chamber → cold air chamber. The circulating air absorbs heat from the power equipment housed in the equipment room and the bus housed in the bus room and radiates heat in the heat radiating room. For this reason, the rise in temperature inside an equipment room, a busbar room, etc. can be controlled.

  (2) The air that cools the circuit breakers 53, 54, etc. is circulated in the order of cold air chamber → equipment chamber → busbar chamber → heat radiation chamber → cold air chamber. That is, in the switchgear 10, the circuit breakers 53, 54 and the like are cooled by an internal circulation system in which air circulates inside. For this reason, since it is not necessary to take in external air, the contamination and dew condensation by dust and moisture can be reduced. Moreover, since an expensive air conditioner is not required, cost can be reduced. In addition, maintenance of a dustproof filter or the like is not required as compared with a method of taking outside air and cooling the inside.

  (3) A bus room 32 is provided behind the cold air chamber 31, an equipment room 33 is provided as an upper equipment room above the cold air room 31 and the bus room 32, and a lower stage is provided below the cold air room 31 and the bus room 32. An equipment room 34 is provided as an equipment room. The circuit breakers 53 and 54 accommodated in the equipment rooms 33 and 34 are connected to the bus 52 accommodated in the bus room 32. Therefore, by disposing the bus bar chamber 32 between the equipment rooms 33 and 34, the bus bar 52 can be connected to each of the circuit breakers 53 and 54 through a short path.

  (4) The outer housing 21 is provided with a branch bus chamber 35 in which branch buses 55 and 56, current transformers 61 and 62, and zero-phase current transformers 63 and 64 are accommodated. Yes. Since these heats are transmitted to the connected bus bar 52 and the like, it is possible to suppress a temperature rise inside the branch bus bar chamber 35. And it can suppress that dust and moisture enter by making branch branch room 35 into a sealed structure. Thereby, maintenance inside the branch bus room 35 (maintenance) can be made unnecessary.

  (5) The heat radiation chambers 12a and 12b are provided with cooling fins 13a and 13b. By the cooling fins 13a and 13b, the temperature of the air passing through the heat radiation chambers 12a and 12b is efficiently radiated to the outside air, and the temperature of the air can be lowered.

In addition, you may implement the said embodiment in the following aspects.
-Although the said embodiment illustrated the switchgear 10 which arranged six power boards 11a-11f in parallel, the number and kind of power boards may be changed suitably.

  For example, when a plurality of switch gears are installed, the switch gear includes a bus bar connecting board that connects the bus bars of each switch gear as a power board. Similar to the power panels 11a to 11f, such a bus bar connection board has a cold air room, a bus bar room, and an equipment room, and the cold air room and the bus bar room communicate with the cold air room and the bus bar room of the adjacent power board, respectively. doing. And the bus-line connection board contains the circuit breaker for connecting / separating the bus-bar of each switch gear as electric power equipment, and the circuit breaker is accommodated in an equipment room.

  -With respect to the said embodiment, the dehumidifier may be accommodated in the cold air chamber 31, for example. The dehumidifier is, for example, an electronic dehumidifier that uses the Peltier effect, and can dehumidify the air circulating in the busbar chamber 32 and the like.

  In contrast to the above embodiment, a filter may be provided in the suction port of the circulation fans 71 and 72 in the cold air chamber 31. For example, dust that has entered the cold air chamber 31 or the like during maintenance can be removed by the filter. Further, by providing a filter at the suction port of the circulation fans 71 and 72, the filter can be exchanged via the open / close door 41 of the cold air chamber 31.

  In the above embodiment, the cooling fins 13a and 13b are disposed in the heat radiation chambers 12a and 12b, but the cooling fins 13a and 13b may be omitted. Moreover, you may provide a cooling fin in the inner surface and the outer surface of the thermal radiation chamber 12a, 12b.

In the above embodiment, it is sufficient if air can be circulated inside, and the positions of the circulation fans 71 and 72 may be changed as appropriate.
In the above embodiment, the branch bus chamber 35 is a completely sealed box, but may be a simple sealed box with a packing or the like attached to the gap.

  DESCRIPTION OF SYMBOLS 10 ... Switch gear, 11a-11f ... Power panel, 12a, 12b ... Radiation room, 13a, 13b ... Cooling fin, 21 ... Outer housing (housing), 31, 31a-31f ... Cold air room, 32, 32a-32f ... Bus room, 33 ... equipment room (upper equipment room), 34 ... equipment room (lower equipment room), 35 ... branch bus room, 52 ... bus bars (R, S, T), 53, 54 ... circuit breaker (power equipment) 55, 56 ... branch buses, 71, 72, 72a to 72f ... circulating fans.

Claims (5)

A power board storing at least a bus and a power device connected to the bus in a housing;
A heat dissipating chamber connected to the side of the power panel and the outside surface touching the outside air;
Have
The housing includes at least a cold air chamber, a bus bar chamber that accommodates the bus bar adjacent to the cold air chamber, and an equipment room that accommodates the power device, and the cold air chamber communicates with the equipment room. The equipment room communicates with the busbar room, and a circulation fan is provided to send air from the cold air room to the equipment room,
The heat dissipating chamber communicates the cold air chamber and the busbar chamber;
Switch gear characterized by The switchgear according to claim 1,
The bus room is disposed behind the cold air chamber,
The equipment room is disposed above the cold air room and the bus bar room, and is disposed below the upper equipment room, which communicates with the cold air room and the bus bar room, and below the cold air room and the bus bar room, respectively. A lower equipment room that is provided and communicated with the cold room and the bus room,
Switch gear characterized by The switchgear according to claim 1 or 2,
A switchgear characterized in that the housing is provided with a branch bus chamber in which a branch bus connecting the bus and the power device is accommodated. In the switchgear as described in any one of Claims 1-3,
The switchgear is characterized in that the heat radiating chamber has cooling fins for cooling the air passing therethrough. In the switchgear as described in any one of Claims 1-4,
A plurality of the power panels are juxtaposed,
The cold air chamber and the busbar chamber of the plurality of power panels are communicated with each other in the plurality of power panels arranged in parallel,
The heat dissipation chamber is connected to the side surfaces of the power panels at both ends of the plurality of power panels arranged in parallel,
Switch gear characterized by

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