JP4839149B2 - Distribution board - Google Patents

Description

  The present invention comprises at least an intake panel, a wind tunnel panel, and an exhaust panel, which are sequentially juxtaposed in a straight line in a predetermined direction, and disposed in the intake panel and the exhaust panel. The present invention relates to a power distribution board in which an air cooling type power converter in the wind tunnel board is cooled by cooling air generated by the exhaust fan.

  Conventionally, cooling in a power conversion apparatus has been mainly water, oil, or air as a cooling medium. Among these, in the power conversion device that uses air as a cooling medium and performs a cooling method using a fan (hereinafter referred to as a forced air cooling method), a monitoring panel, a control protection panel, an AC / DC converter panel constituting the power conversion device, A structure in which the interconnection transformer panel and the auxiliary machine panel are individually configured, and a fan is provided in the panel provided with a roof part (ceiling part) each having an air inlet and an exhaust opening, and exhausted from the exhaust opening. It is common.

  The cooling structure of the conventional power converter is demonstrated using FIG.14 and FIG.15. Each of the above-described panels is configured such that each device (not shown) is accommodated in the casing 01, and outside air is sucked into the casing 01 from an intake port 02 formed on the front side of the casing 01, for example. The fan (not shown) disposed at the top of the casing 01 sucks heat in the casing 01 and exhausts it from the exhaust port 03 formed at the top of the casing 01 to the outside of the casing 01. ing. In FIG. 15, arrows (wide arrows) indicate the flow of air.

  In the case of the cooling structure in the conventional power conversion apparatus shown in FIGS. 14 and 15 described above, each panel housing each device must be individually cooled, and a cooling fan is installed in each panel. It is necessary, and the external shape of the power conversion device becomes large, and there are many restrictions such as holding land. In addition, when installed outdoors, the structure must be designed in consideration of rainwater intrusion from the exhaust opening provided in the roof.

  An object of this invention is to provide the power distribution panel which can cool a some apparatus panel collectively.

In order to achieve the above object, the invention corresponding to claim 1 is characterized in that an intake opening is formed on a side wall of the intake panel casing, and is in the intake panel casing and close to the intake opening. An intake panel configured to store an intake fan and supply power to a load;
A wind tunnel board in which a wind-cooled power converter for supplying power converted from DC power or AC power from a power supply source to the load is housed in a wind tunnel board housing;
An exhaust opening is formed in a side wall of the exhaust panel housing, an exhaust fan is accommodated in the exhaust panel housing in the vicinity of the exhaust opening, and direct current power from the power supply source Or an exhaust panel configured to take in AC power,
The intake panel, the wind tunnel panel, and the exhaust panel are arranged in a line in order in a straight line, and communicate with each other, and the intake fan passes through the intake opening. The outside air is sucked into the row board and discharged to the outside of the row board by the exhaust fan through the exhaust opening, so that the electric power is generated by the cooling air generated inside the wind tunnel board case. This is a power distribution board that cools the converter.

In order to achieve the above object, the invention corresponding to claim 2 is to monitor the entire equipment in a configuration in which an intake opening is formed in the side wall of the monitor panel casing and power can be supplied to the load. Monitoring board
A control protection panel that houses a control protection device for the entire panel, while an intake fan is stored in the casing for the control protection panel,
A power converter board in which a wind-cooled power converter that supplies power obtained by converting DC power or AC power from a power supply source to the load is housed in a casing for the power converter board;
An exhaust opening is formed in a side wall of the auxiliary machine casing, an exhaust fan is housed in the auxiliary machine casing in the vicinity of the exhaust opening, and from the power supply source An auxiliary machine panel configured to be able to take in DC power or AC power,
The monitoring board, the control protection board, the power converter board, and the auxiliary machine board are sequentially arranged in a straight line in a predetermined direction and communicated between the boards, The control protection panel casing is configured such that outside air is sucked into the panel through the intake opening by a fan and discharged outside the panel through the exhaust opening by the exhaust fan. The power distribution board is configured to cool the power converter by cooling air generated inside.

In order to achieve the above-mentioned object, the invention corresponding to claim 3 is for monitoring the entire equipment in a configuration in which an opening for intake is formed in the side wall of the casing for the monitoring panel and power can be supplied to the load. A monitoring panel;
A control protection panel that houses a control protection device for the entire panel, while an intake fan is stored in the casing for the control protection panel,
A power converter board in which a wind-cooled power converter that supplies power obtained by converting DC power or AC power from a power supply source to the load is housed in a casing for the power converter board;
An interconnecting transformer panel that houses an interconnecting transformer for stepping down or boosting an AC voltage from the power supply source in a casing for the interconnecting transformer panel; and
An exhaust opening is formed in a side wall of the auxiliary machine casing, an exhaust fan is housed in the auxiliary machine casing in the vicinity of the exhaust opening, and from the power supply source An auxiliary machine panel configured to be able to take in DC power or AC power,
The monitoring board, the control protection board, the power converter board, the interconnection transformer board, and the auxiliary machine board are arranged in a line in a predetermined direction in a straight line, and The outside air is sucked into the row board through the intake opening by the intake fan, and is discharged outside the row board through the exhaust opening by the exhaust fan. The power distribution board is configured to cool the power converter and the interconnection transformer with cooling air generated inside the control protection board casing.

  ADVANTAGE OF THE INVENTION According to this invention, the power distribution panel which can cool a some apparatus panel collectively can be provided.

  Embodiments of the present invention will be described below with reference to the drawings, but before that, an overview of the present invention will be described with reference to FIGS. Here, the distribution board of the present invention includes an intake panel such as a monitoring panel 10 and a control protection panel 20, a wind tunnel panel such as four power converter panels 30 and an interconnection transformer panel 40, and an exhaust panel such as an auxiliary panel 50. Are sequentially juxtaposed in a straight line in a predetermined direction and communicated between the panels, and an intake opening formed on a side surface of the casing 21 is provided in a casing 21 of the control protection panel 20, for example, a casing constituting the intake panel. The intake fan 22 is built in at a predetermined distance from the parts 121 and 122, and an exhaust opening formed on a side surface of the casing 51 is provided in the casing 51 constituting the exhaust panel, for example, the auxiliary machine panel 50. An exhaust fan 53 is incorporated at a predetermined distance from the section 52, the wind in the intake panel taken in by the intake fan 22 is sent to the wind tunnel panel, and finally discharged to the outside by the exhaust fan 53 in the exhaust panel. With forced cooling and cross-cooling That.

  The monitoring panel 10 is a side wall of the monitoring panel casing 11 and has openings 121 and 122 for intake on the back side and the back side of the left side wall, respectively, and can charge and discharge a load such as a sodium-sulfur battery. This is for monitoring the entire device with a configuration capable of supplying power to the battery.

  The control protection board 20 includes, for example, four intake fans 22 in the vertical direction in a room on the back side in the control protection board casing 21 and protects the entire board. It contains equipment. This protective device includes a control board (not shown) that should not be directly exposed to the cooling air described later.

  The power converter board 30 is composed of, for example, four units, each of which supplies power to the load, which is obtained by converting AC power from a power supply source, for example, power system, into DC power in the converter board casing 31. Each of the semiconductor devices that house the converter and that constitute the power converter includes a semiconductor element 32, for example, an IGBT, in which a radiation fin 33 and a mini fan 34 are integrally formed. Here, the wind generated by the mini fan 34 hits the heat radiating fins 33, thereby cooling the heat radiating fins 33, thereby cooling each semiconductor element 32. Panels 35 are integrally formed on the heat radiation fins 33 so that the air after cooling the semiconductor elements 32 circulates in the casing 31 of the power converter board 30 as indicated by arrows in FIG.

  In the interconnection transformer panel 40, an interconnection transformer 42 that steps down an AC voltage from a power supply source, for example, an electric power system, is housed in an enclosure 41 for the interconnection transformer panel, and a miniature transformer is provided on the entrance side of the enclosure 41. A fan 44 (for example, the same one provided in each power converter panel 30) is provided. This is the power converter board 30 and circuit elements other than the semiconductor elements 32, such as capacitors and reactors, outside the panel 35, are cooled by cooling air generated by the intake fan 22 and the exhaust fan 53. A mini fan 44 is provided so that the cooling air is guided into the interconnection transformer casing 41.

  The auxiliary machine panel 50 has an exhaust opening 52 formed in the side wall of the auxiliary machine casing 51, and is located in the auxiliary machine casing 51 within a predetermined distance from the exhaust opening. 53 is stored and installed, and AC power from the power system can be taken in.

  The monitoring board 10, the control protection board 20, the power converter board 30, the interconnection transformer board 40, and the auxiliary machine board 50 are sequentially arranged in a straight line in a predetermined direction. The panels communicate with each other, the intake fan 22 sucks outside air into the row board via the intake openings 121 and 122, and the exhaust fan 53 discharges the outside of the row board through the exhaust opening 52. By doing so, the power distribution board is configured to cool the power converter and the interconnection transformer with cooling air generated inside the casing 21 for control protection board.

  The power distribution board described above is a forced air cooling cross-cooling system, and is therefore useful when the amount of heat generated in the board is large, for example, when a sodium ion battery is charged. The power distribution panel described above includes at least an intake panel, a wind tunnel panel, and an exhaust panel arranged in a straight line sequentially in a predetermined direction, a monitoring panel 10, a control protection panel 20, and a power converter panel 30. Auxiliary machine panels 50 are sequentially juxtaposed in a straight line in a predetermined direction. Further, the monitoring panel 10, the control protection panel 20, the power converter panel 30, the interconnection transformer panel 40, and the auxiliary machine panel 50 are sequentially arranged. The panels are arranged side by side in a straight line in a predetermined direction, communicate with each other, and the exhaust fan 22 and the exhaust panel or auxiliary panel 50 have the intake fan 22 and the exhaust panel or auxiliary panel 50 that are included in the intake panel or control protection panel 20. Since the power converter, the interconnection transformer, and the auxiliary machine are cooled by the cooling fan generated in the panel by the fan 53, the following operational effects can be obtained.

  1) Conventionally, the installation area can be reduced by adopting a panel configuration for each device that has been distributed.

  2) The number of intake air filters can be greatly reduced by providing the intake air filters necessary for each device only on the panel on one end side of the row configuration.

  3) The forced air cooling configuration that is conventionally provided for each device is unnecessary, and thus, the number of parts is unnecessary, and the number of parts can be reduced.

  4) In order to prevent the amount of air leakage between the panels when the entire device is made into a wind tunnel, it has a structure that minimizes pressure loss, expansion and reduction loss due to bending of the cooling air flow path. .

    Here, the configuration of each panel will be described with reference to FIGS. As shown in FIGS. 4 and 5, the monitoring panel 10 is a partition member, for example, three vertical partition plates 131, substantially in the center of the housing 11, along the flow direction of the cooling air, and vertically. 132 and 133 are installed, and the inside of the housing 11 is divided into two left and right chambers to form a left divided chamber 15L and a right divided chamber 15R. In this case, a horizontal gap 14 of, for example, 2 mm is formed between the vertical partition plates 131, 132, and 133, and this gap 14 is part of the cooling air generated by the intake fan 22 and the exhaust fan 53. The weak cooling air acts as a wind guide path for guiding the weak cooling air in a predetermined direction, specifically, from the left divided chamber 15L in the housing 11 partitioned by the vertical partition plates 131, 132, 133 to the right divided chamber 15R. In this way, by using the gap 14 between the partition plates and generating a microcirculation flow locally, in the forced air cooling device, it is possible to arrange a precision device or the like inside the control protection panel 20. Become.

  Next, as shown in FIG. 6, the control protection board 20 is provided with a partition member, for example, one vertical partition plate 23 in the vertical direction at the center of the control protection board casing 21, and the control protection board casing 21. The interior is divided into front and back chambers, for example, four intake fans 22 are installed in the back chamber 24B, and nothing is installed in the front chamber 24F. In this case, each intake fan 22 is installed at a predetermined distance, for example, 900 mm from the intake openings 121 and 122 formed in the casing 11 of the monitoring panel 10. Further, for example, four exhaust fans 53 are respectively arranged in the casing 512 of the auxiliary machine panel, and each exhaust fan 53 is connected to the exhaust opening 52 formed in the casing 512 of the auxiliary machine board 50. They are set apart by a predetermined distance, for example, 900 mm.

  Thus, by separating the intake fan 22 from the intake openings 121 and 122 by a predetermined distance, the cooling air generated by the intake fan 22 and the exhaust fan 53 can be rectified, and pressure loss due to this can be reduced. .

  Further, by separating the exhaust fan 53 from the exhaust opening 53 by a predetermined distance, the cooling air generated by the intake fan 22 and the exhaust fan 53 can be rectified, thereby reducing pressure loss and reducing noise. Can also be expected. As a result of actually performing a cooling performance test on this, the required air volume with respect to the amount of heat generated in the device was satisfied, and the temperature rise at each part was within the allowable value, so that the required cooling performance could be satisfied. it can.

  Of the power converter boards 30, the most upstream power converter board 30 connected to the control protection board 20 is one opening in the housing 31 as shown in FIG. In addition, partition members, for example, three vertical partition plates 361, 362, 363 are installed in a direction perpendicular to the flow direction of the cooling air and in the vertical direction, and the inside of the casing 31 is made into one reduced chamber 37. The reduced chamber 37 accommodates the semiconductor devices that constitute the power converter described above. In this case, a horizontal gap 38 of 2 mm, for example, is formed between the vertical partition plates 361, 362, 363, respectively.

  The gap 38 allows the weak cooling air, which is a part of the cooling air generated by the intake fan 22 and the exhaust fan 53, to flow in a predetermined direction, specifically, from the upstream power converter panel 30 side to the vertical partition plate 361. , 362 and 363 are guided to the casing 21 of the control protection board 20 through the gap 38 therebetween. In the casing 31 of the power converter panel 30 on the most upstream side, the wind from the mini fan 34 included in the semiconductor device and the cooling air generated by the intake fan 22 and the exhaust fan 53 are combined.

  As shown in FIG. 8, the upstream, downstream, and most downstream power converter panels 30 are not provided with any of the vertical partition plates described above. In this case, the wind from the mini-fan 34 included in each semiconductor device and the cooling wind generated by the intake fan 22 and the exhaust fan 53 are combined, and this combined wind passes through each casing in sequence and is located on the most downstream side. Is exhausted to the outside through the exhaust opening 52. Thus, since the mini fan 34 is attached to each semiconductor device, the pressure loss generated in the heat radiation fin 33 can be equally borne for each device.

  Next, as shown in FIG. 9, the interconnecting transformer panel 40 has a partition member for reducing the cross-sectional area of the wind slightly in the interconnecting transformer panel casing 41, for example, three partition plates 43. And the interconnection transformer 42 is housed and installed in the remaining space.

  The auxiliary machine panel 50 is provided with an auxiliary machine case 511 as shown in FIG. 10 and an auxiliary machine case 512 as shown in FIG. Partition members, for example, two partition plates 54 and three partition plates 55 are provided for reducing the cross-sectional area of the flow path, and in the remaining spaces of the auxiliary machine casings 511 and 512, the switchboard auxiliary machines are respectively provided. (Not shown) and the above-described exhaust fan 53 are provided with a cylindrical cover 56 so as to surround the exhaust fan 53 and to be connected to the exhaust opening 52.

  FIG. 12 shows that the flow of cooling air generated in the row of FIG. 3 is between the intake openings 121, 122 and the exhaust opening 52, and at least the power converter or the end of the power converter. It is a figure for demonstrating having comprised so that a flow-path cross-sectional area might decrease so that it might become a speed-increasing flow toward the opening part 52 for exhaust_gas | exhaustion. FIG. 12A is a cross section cut along the line AA in FIG. 3, and is a flow path cross-sectional area SA in this case. FIG. 12B is a cross section cut along the line BB in FIG. 3, and is a flow path cross-sectional area SB in this case. FIG. 12C is a cross-section cut along the line CC in FIG. 3, and is a flow path cross-sectional area SC in this case. A relationship SC <SB <SA exists between the cross-sectional areas of the respective channels.

    Using this partition plate, the flow inside the device can be increased by decreasing the partition plate opening area (ventilation area) toward the exhaust side, and with respect to the intake openings 121 and 122 Since the intake fan 22 is installed with a predetermined separation distance, it is possible to suppress rainwater and dust intrusion.

  FIG. 13 shows the casing 11 of the monitoring panel 10, the casing 21 of the control protection panel 20, the casing 31 of the four power converter panels 30, the casing 41 of the interconnection transformer panel 40, and the auxiliary equipment. The casings 511 and 512 of the panel 50 are each provided with a cover 3 on the inside (outside of FIG. 13) or outside of the members constituting the respective casings such as the side members or the door 1 and the roof member 2. An air layer 4 is formed between a member constituting the body and the cover 3.

  By forming the air layer 4 on the inside or outside of the housing in this way, it is possible to expect a soundproofing effect and an effect of blocking radiant heat from sunlight and reducing the amount of heat generated in each device panel. In addition, since each panel has no ceiling, there is no risk of rainwater entering the panel when installed outdoors. Furthermore, when the intake fan 22 and the exhaust fan 53 are replaced, the door 1 provided on the front or back of the casings 21 and 512 can be opened and closed, so that it is easy to replace these ventilation fans. Thus, maintainability is improved.

  Furthermore, according to the embodiment of the present invention, it is possible to reduce rainwater and dust intrusion countermeasures. Conventionally, it is necessary to take measures against rainwater intrusion from the exhaust opening provided in the roof, but in the embodiment of the present invention, the exhaust opening is formed in the roof by cooling in the row direction. The structure is not provided. Therefore, consideration for rainwater is also reduced.

  In addition, since a cover is provided on the inside or outside of each housing, the airtightness in the panel can be improved, and this provides a reliable sealing structure between the panel boards. The amount of air leakage at is eliminated.

(Modification)
The present invention is not limited to the embodiments described above, and can be implemented with various modifications. In the above-described embodiment, the flow of the cooling air generated in the row board between the intake openings 121, 122 of the row board configuration and the exhaust opening 52 increases toward the exhaust hole 52. An example of a structure configured as follows is given as an example of a structure for achieving a fast flow. Specifically, the speed increasing flow is from the intake openings 121 and 122 to the exhaust opening 52 and from the end of the power converter board 30 or the power converter board 30 toward the exhaust opening 52. In this example, the cross-sectional area of the flow path is reduced so that However, the present invention is not limited to this, and any device panel existing between the intake openings 121 and 122 and the exhaust opening 52 may be used.

  In the above-described embodiment, the power distribution panel including the monitoring panel 10, the control protection panel 20, the four power converter panels 30, the interconnection transformer panel 40, and the auxiliary machine panel 50 has been described. Any configuration may be employed as long as an equipment panel such as a wind tunnel board or a wind regulation board is provided between the exhaust board and the intake board and the exhaust board.

The perspective view for demonstrating the outline | summary of the power distribution panel by this invention. The perspective view for demonstrating schematic structure of the power distribution panel by this invention. 1 is a schematic cross-sectional view showing a first embodiment of a power distribution board according to the present invention. The expansion exploded perspective view seen in the H arrow direction of FIG. The expansion disassembled perspective view seen in the arrow direction along the GG line of FIG. The expansion disassembled perspective view seen in the arrow direction along the EE line of FIG. The expansion disassembled perspective view seen in the arrow direction along the DD line | wire of FIG. The expansion disassembled perspective view seen in the arrow direction along the FF line of FIG. The expansion exploded perspective view seen in the direction of an arrow along the AA line of FIG. The expansion disassembled perspective view seen in the arrow direction along the BB line of FIG. The expansion disassembled perspective view seen in the arrow direction along the CC line of FIG. FIG. 4 is an enlarged exploded perspective view taken along the lines AA, BB, and CC in FIG. 3 and viewed in the direction of the arrows. FIG. 4 is an enlarged side view of FIG. 3. (a) And (b) is the top view and front view of the conventional power distribution panel. (a) And (b) is a rear view and a right side view of a conventional power distribution board.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 01 ... Housing, 1 ... Door, 02 ... Air intake port, 2 ... Roof member, 03 ... Exhaust port, 3 ... Cover, 11 ... Monitoring cabinet, 14 ... Gap, 15L ... Left division chamber, 15R ... Right division 20 ... Control protection panel, 21 ... Control protection cabinet, 22 ... Air intake fan, 23 ... Vertical partition plate, 24B ... Back room, 24F ... Front room, 30 ... Power converter panel, 31 ... Converter Case for panel, 32 ... Semiconductor element, 33 ... Radiation fin, 34 ... Mini fan, 35 ... Panel, 37 ... Chamber, 38 ... Gap, 40 ... Interconnection transformer panel, 41 ... Case for interconnection transformer panel 42 ... Interconnection transformer, 43 ... Partition plate, 44 ... Mini fan, 50 ... Auxiliary board, 51 ... Housing for auxiliary machine board, 52 ... Exhaust opening, 53 ... Exhaust fan, 54 ... Partition plate 55 ... partition plate, 56 ... cover, 121, 122 ... opening for intake, 131, 132 ... vertical partition plate, 361, 36 ... vertical partition plate, 511, 512 ... auxiliary board housing.

Claims (9)

An intake opening is formed in the side wall of the intake panel casing, and an intake fan is housed in the intake panel casing close to the intake opening and can supply power to the load. The intake panel,
A wind tunnel board in which a wind-cooled power converter for supplying power converted from DC power or AC power from a power supply source to the load is housed in a wind tunnel board housing;
An exhaust opening is formed in a side wall of the exhaust panel housing, an exhaust fan is accommodated in the exhaust panel housing in the vicinity of the exhaust opening, and direct current power from the power supply source Or an exhaust panel configured to take in AC power,
The intake panel, the wind tunnel panel, and the exhaust panel are arranged in a line in order in a straight line, and communicate with each other, and the intake fan passes through the intake opening. The outside air is sucked into the row board and discharged to the outside of the row board by the exhaust fan through the exhaust opening, so that the electric power is generated by the cooling air generated inside the wind tunnel board case. A power distribution board characterized by cooling the converter. A monitoring panel for monitoring the entire device in a configuration in which an opening for intake is formed in the side wall of the casing for the monitoring panel and power can be supplied to the load;
A control protection panel that houses a control protection device for the entire panel, while an intake fan is stored in the casing for the control protection panel,
A power converter board in which a wind-cooled power converter that supplies power obtained by converting DC power or AC power from a power supply source to the load is housed in a casing for the power converter board;
An exhaust opening is formed in a side wall of the auxiliary machine casing, an exhaust fan is housed in the auxiliary machine casing in the vicinity of the exhaust opening, and from the power supply source An auxiliary machine panel configured to be able to take in DC power or AC power,
The monitoring board, the control protection board, the power converter board, and the auxiliary machine board are sequentially arranged in a straight line in a predetermined direction and communicated between the boards, The control protection panel casing is configured such that outside air is sucked into the panel through the intake opening by a fan and discharged outside the panel through the exhaust opening by the exhaust fan. A power distribution board characterized in that the power converter is cooled by cooling air generated inside. A monitoring panel for monitoring the entire device in a configuration in which an opening for intake is formed on the side wall of the casing for the monitoring panel and power can be supplied to the load;
A control protection panel that houses a control protection device for the entire panel, while an intake fan is stored in the casing for the control protection panel,
A power converter board in which a wind-cooled power converter that supplies power obtained by converting DC power or AC power from a power supply source to the load is housed in a casing for the power converter board;
An interconnecting transformer panel that houses an interconnecting transformer for stepping down or boosting an AC voltage from the power supply source in a casing for the interconnecting transformer panel; and
An exhaust opening is formed in a side wall of the auxiliary machine casing, an exhaust fan is housed in the auxiliary machine casing in the vicinity of the exhaust opening, and from the power supply source An auxiliary machine panel configured to be able to take in DC power or AC power,
The monitoring board, the control protection board, the power converter board, the interconnection transformer board, and the auxiliary machine board are arranged in a line in a predetermined direction in a straight line, and The outside air is sucked into the row board through the intake opening by the intake fan, and is discharged outside the row board through the exhaust opening by the exhaust fan. The power distribution board, wherein the power converter and the interconnection transformer are cooled by cooling air generated inside the control protection board casing.   The power distribution board according to any one of claims 1 to 3, wherein the intake fan is disposed at a predetermined distance from the intake opening.   The distribution board according to any one of claims 1 to 3, wherein the exhaust fan is disposed at a predetermined distance from the exhaust opening.   The cooling air flow generated between the intake opening and the exhaust opening is generated in the row board so as to increase in speed toward the exhaust opening. The power distribution board according to any one of claims 1 to 5.   The configuration for increasing the speed of flow toward the exhaust opening is performed by changing a cross-sectional area of the flow path in the equipment panel constituting the row board. Item 7. The power distribution board according to any one of Items 1 to 6.   The monitoring panel and the control protection panel so as to circulate a weak cooling air that is a part of the cooling air generated by the intake fan and the exhaust fan around a control board in the control monitoring panel. The distribution board according to claim 3, wherein a partition member having an air guide path for guiding the cooling air in a predetermined direction is provided in the casing.   A cover is disposed inside or outside at least a side member and a ceiling member constituting the casing of each device panel, and an air layer is formed between the member constituting the casing and the cover. The power distribution board according to any one of claims 1 to 8.

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