JP7124500B2 - switchgear - Google Patents

Description

The present invention relates to switchgear.

For example, power receiving and transforming equipment installed in buildings, factories, etc. includes a switchgear in which a power device such as a circuit breaker connected to a busbar extending from a lead-in line to a distribution line is housed in a box (housing). In such a power receiving and transforming facility, the inside of the box housing the electric power equipment and the like rises in temperature due to the operation of the electric power equipment and the like. For this reason, some power receiving and transforming equipment cools the inside by circulating the internal air in order to suppress the rise in the internal temperature (see, for example, Patent Document 1).

JP 2017-153212 A

By the way, in the equipment as described above, there is room for improvement in suppressing the rise of the internal temperature.
SUMMARY OF THE INVENTION An object of the present invention is to provide a switchgear capable of suppressing an increase in internal temperature.

A switchgear for solving the above problems comprises: a board housing having an intake port on either one of a front surface and a rear surface; and an exhaust fan on the other of the front surface and the rear surface; a unit accommodating at least a busbar and power equipment connected to the busbar, wherein the unit includes a busbar chamber accommodating the busbar, and a busbar chamber disposed above the busbar chamber and communicating with the busbar chamber. a first equipment room for accommodating first power equipment; a second equipment room disposed below the busbar room and communicating with the busbar room for accommodating second power equipment; It has a cooling duct that communicates the first equipment room and the second equipment room, and a circulation fan that circulates the air inside the unit.

According to this configuration, the air sucked through the air intake is discharged by the exhaust fan, and the air inside the cooling duct of the unit is cooled by the air flow between the air intake and the exhaust fan. The air circulated by the circulation fan cools the inside of the first equipment room and the second equipment room communicating with the cooling duct, and the busbar room communicating with the first equipment room and the second equipment room. be. Therefore, it is possible to suppress the internal temperature rise.

In the above switchgear, it is preferable that the cooling duct is formed narrower than the first equipment chamber and the second equipment chamber.
According to this configuration, the narrow cooling duct speeds up the flow of air passing through the cooling duct, thereby increasing the air volume of the circulation fan and suppressing an increase in the internal temperature of the unit.

Said switchgear WHEREIN: It is preferable that a said 1st apparatus room and a said 2nd apparatus room are formed narrower than the said board housing|casing.
According to this configuration, the air flow from the intake port to the exhaust fan flows along the side surfaces of the first equipment room and the second equipment room, which are narrower than the width of the board housing. The temperature of the air is radiated to the outside.

In the switchgear described above, it is preferable that the first circulation fan is arranged in the busbar room and sends air from the second equipment room to the busbar room.
According to this configuration, by sending the air in the second equipment room into the bus room, the cooled air flows into the second equipment room from the cooling duct, and the temperature rise inside the second equipment room is suppressed. be.

In the switchgear described above, it is preferable that the busbar chamber is provided with a circulation box that houses the first circulation fan and an opening/closing door that covers an opening of the circulation box.
According to this configuration, the circulation box separates the space for accommodating the first circulation fan and the space for accommodating the bus. By opening and closing the open/close door that covers the opening of the circulation box, the first circulation fan can be replaced while the bus is energized.

In the above switchgear, a terminal portion to which the contact of the second electric power device is connected and disconnected is provided at the rear end of the second equipment chamber, and the second equipment chamber includes It is preferable that a supply unit is provided for supplying air toward the substrate.

According to this configuration, the air supplied from the supply unit cools the terminal portion to which the contactor of the second electric power device contacts and separates.
In the above switchgear, the supply unit includes a circulation duct disposed below the second electric power device, a second circulation fan provided at a front end of the circulation duct and sending air to the circulation duct, and a guide plate provided at the rear end of the circulation duct for adjusting the air in the circulation duct toward the terminal portion.

According to this configuration, the air sent to the circulation duct by the second circulation fan is efficiently supplied to the terminal portion by the guide plate, and the temperature rise of the terminal portion is suppressed.
In the switchgear described above, it is preferable that the second equipment chamber has a guide plate arranged to supply air behind the second equipment chamber to the first circulation fan.

According to this configuration, by sending the air behind the second equipment room to the bus room with the first circulation fan, the air that has cooled the terminal section provided at the rear end of the second equipment room can be efficiently Often the second equipment room can be evacuated.

A switchgear for solving the above problems comprises a board housing, and a unit that is installed in the board housing and accommodates at least a bus line and power equipment connected to the bus line, and the unit includes the bus line. a first equipment chamber disposed above the busbar chamber and communicating with the busbar chamber to accommodate a first power device; and a first equipment chamber disposed below the busbar chamber, a second equipment room that communicates with the bus room and houses second power equipment; a circulation duct that communicates the first equipment room and the second equipment room; A first circulation fan provided and a second circulation fan provided in the second equipment room.

According to this configuration, the air inside the unit is circulated through the first equipment room, the circulation duct, the second equipment room, and the bus line by the first circulation fan and the second circulation fan. temperature rise can be suppressed.

In the above switchgear, the first circulation fan is attached to a first partition wall that partitions the first equipment room in the front-rear direction, and extends from the rear to the front of the first equipment room. The second circulation fan is attached to a second partition wall that partitions the second equipment room in the front-rear direction, and is attached to the front of the second equipment room. is preferably arranged to send air rearwardly from the

According to this configuration, the first circulation fan sends air from the rear to the front of the first equipment room, and the second circulation fan sends air from the front to the rear of the second equipment room, The air inside the unit is efficiently circulated, and the temperature rise inside the unit is suppressed.

In the above switchgear, a first guide plate disposed below the first circulation fan and extending rearward of the first equipment room from the first partition wall; and a second guide plate disposed below and extending rearward of the second equipment room from the second partition wall.

According to this configuration, the air behind the first equipment room can be sent forward by the first guide plate, and the air can be sent to the rear of the second equipment room by the second guide plate. and air can be circulated throughout the unit.

ADVANTAGE OF THE INVENTION According to this invention, the switchgear which can suppress the internal temperature rise can be provided.

The schematic front view of a switchgear. (a) is a schematic front view of a switchboard (transformer secondary board), and (b) is a schematic side view of the switchboard (transformer secondary board). (a) and (b) are schematic perspective views showing a fan unit of a switchboard (transformer secondary board). (a) and (b) are explanatory diagrams showing the operation of a switchboard (transformer secondary board). (a) is a schematic front view of a switchboard (distribution panel), and (b) is a schematic side view of the switchboard (distribution panel). Explanatory drawing which shows the effect|action in a switchboard (distribution switchboard).

An embodiment will be described below.
It should be noted that the attached drawings may show constituent elements on an enlarged scale for easy understanding. The dimensional proportions of components may differ from those in reality or in other drawings. Also, in cross-sectional views, hatching of some components may be omitted for easy understanding.

A switchgear 10 shown in FIG. 1 is, for example, power receiving and transforming equipment installed outdoors such as in a building or a factory. In addition, you may be set as the receiving and transforming equipment installed indoors.
The switchgear 10 has a plurality (seven in FIG. 1) of switchboards 11-17. A plurality of switchboards 11 to 17 are horizontally arranged and connected to each other.

The switchboards 11 to 17 include, for example, a transformer secondary board (TR secondary board), a bus connection board, a power receiving board, a distribution line board, a transformer primary board (TR primary board), an in-station transformer board (TR board), VCT disk, etc. Each of the switchboards 11 to 17 has a structure in which a three-phase bus 41 (R, S, T) (see broken lines in the drawing) penetrates horizontally. In this embodiment, switchboards 11 and 17 are transformer secondary boards (TR secondary boards), switchboards 12, 13, 15 and 16 are switchboards, and switchboard 14 is a busbar connection board. The configuration, arrangement, etc. of each of the switchboards 11 to 17 may be changed as appropriate.

First, the switchboard 11 will be described.
The switchboard 11 shown in FIGS. 2A and 2B is, for example, a transformer secondary board (TR secondary board). In the schematic front view of the switchboard 11 shown in FIG. 2(a), the front door 22 is omitted and the unit 30 is shown.

The switchboard 11 has a board housing 20 . The board housing 20 includes a body portion 21 in which power equipment is arranged, a front door 22 as a door body disposed on the front side of the body portion 21 (left side in FIG. 2B), and the body portion 21. A rear door 23 is provided as a door body on the rear side (right side in FIG. 2(b)). The front door 22 and the rear door 23 are rotatably supported by the board housing 20 . The front door 22 and the rear door 23 are opened and closed by operating opening/closing levers 22a and 23a, respectively. A heat insulating material (not shown) may be attached to the inner surfaces of the front door 22 and the rear door 23 in some cases.

A ventilation unit 23b is attached to the rear door 23 as an intake port. In this embodiment, two ventilation units 23b are provided. The ventilation unit 23b includes, for example, a louver member that suppresses intrusion of jet water from the outside. Note that the ventilation unit 23b may include a dust removal filter that collects dust such as dust present in large numbers in the atmosphere.

The board housing 20 has an inner ceiling plate 24 covering the upper surface of the main body 21 and an outer ceiling plate 25 arranged above the inner ceiling plate 24 with a space therebetween. A heat insulating material (not shown) is attached to the inner surface of the outer ceiling plate 25 . The inner ceiling plate 24 is provided with a ventilation fan 24a on the front door 22 side. As shown in FIG. 2(a), the inner ceiling plate 24 is provided with a ventilation fan 24a. The ventilation fan 24a is provided so as to exhaust the air inside the body portion 21 . A front wall 26 is provided between the inner ceiling plate 24 and the outer ceiling plate 25, and the front wall 26 is provided with a ventilation unit 26a. The ventilation unit 26a includes, for example, a louver member that suppresses intrusion of jet water from the outside. A guide plate 27 is provided between the inner ceiling plate 24 and the outer ceiling plate 25 . The guide plate 27 is provided to guide the air discharged from the inside of the main body 21 to above the inner ceiling plate 24 by the ventilation fan 24a to the ventilation unit 26a. The ventilation unit 23b of the back door 23 works as an intake port, and the ventilation unit 26a on the front door 22 side works as an exhaust port.

As shown in FIG. 2(b), the unit 30 is accommodated in the body portion 21. As shown in FIG. The unit 30 has a plurality of rooms that partition the interior of the unit 30 . In this embodiment, the switchboard 11 has a busbar room 31, equipment rooms 32 and 33, and a branch busbar room 34 as a plurality of rooms.

The busbar room 31 is arranged in the center of the unit 30 in the vertical direction. An opening/closing door 31a for maintenance is provided on the front surface of the busbar room 31 . A three-phase bus (R, S, T) 41 is housed in the bus room 31 .

The equipment rooms 32 and 33 are arranged above and below the busbar room 31, respectively. The equipment rooms 32 and 33 are formed larger toward the front door 22 than the front of the busbar room 31 . Opening/closing doors 32a and 33a for maintenance are provided on the front surfaces of the equipment rooms 32 and 33, respectively. The equipment rooms 32 and 33 may be distinguished such that the equipment room 32 arranged above the busbar room 31 is an upper equipment room, and the equipment room 33 arranged below the busbar room 31 is called a lower equipment room.

Both equipment chambers 32 and 33 communicate with each other via a cooling duct 35 . The cooling duct 35 is arranged on the front side of the bus chamber 31 . In this embodiment, as shown in FIG. 2A, a pair of left and right cooling ducts 35 are provided.

A partition wall 36a between the busbar room 31 and the upper equipment room 32 is formed with a plurality of ventilation holes penetrating the partition wall 36a in the thickness direction. are in communication with each other.

The power equipment 42 is housed in the upper equipment room 32 . The power equipment 42 is an accessory unit including, for example, a voltage transformer (VT) and a lightning arrester (LA). The power device 42 has a connection terminal 42b. The upper device chamber 32 is provided with a contactor 32c with which the connection terminal 42b of the power device 42 is connected and disconnected. The contactor 32c is connected to a connection conductor 44c of the branch busbar chamber 34, which will be described later, by a bushing or the like.

A partition wall 32b is provided in the upper equipment chamber 32 . The partition wall 32b is provided at substantially the same position as the front panel 42a of the power equipment 42, and partitions the upper equipment room 32 into two rooms in the front-rear direction of the upper equipment room 32 together with the front panel 42a. The partition wall 32b is formed with ventilation holes penetrating through the partition wall 32b in the thickness direction. The ventilation hole communicates two chambers that partition the upper equipment room 32 with the partition wall 32b.

The power equipment 43 is housed in the lower equipment room 33 . The power equipment 43 is, for example, a circuit breaker (VCB). In the following description, the power equipment 43 may be called a circuit breaker 43 . The power device 43 has a connection terminal 43b. The lower device chamber 33 is provided with a contactor 33c with which the connection terminal 43b of the power device 43 is connected and separated. The contactor 33c is connected to a branch busbar 44a and a connection conductor 44b of a branch busbar chamber 34, which will be described later, by a bushing or the like.

A circulation duct 37 is provided in the lower equipment chamber 33 . A circulation duct 37 as a supply section is formed on the floor surface 33b of the lower equipment chamber 33 so as to extend from the front side toward the back side. A circuit breaker 43 as a power device is arranged on the circulation duct 37 . The circulation duct 37 is provided with a plurality of ventilation holes 37a. The ventilation hole 37a is provided below the contactor 33c with which the connection terminal 43b of the circuit breaker 43 is connected and separated.

The circulation duct 37 is provided with a circulation fan 37b and a guide plate 37c. In this embodiment, as shown in FIG. 2A, the circulation duct 37 is provided with a circulation fan 37b. As shown in FIG. 2B, the circulation fan 37b is arranged at the front end (front end) of the circulation duct 37 so as to send air into the circulation duct 37. As shown in FIG. The circulation fan 37b arranged in this way can be replaced by opening the opening/closing door 33a of the lower equipment room 33. FIG. The guide plate 37c is provided at the rear end of the circulation duct 37 so as to guide the air supplied to the circulation duct 37 by the circulation fan 37b to the upper ventilation hole 37a. The ventilation hole 37a is formed below the contactor 33c with which the connection terminal 43b of the circuit breaker 43 is connected and separated. Therefore, the air guided upward by the guide plate 37c of the circulation duct 37 hits the contactor 33c through the ventilation hole 37a and contacts and separates the connection terminal 43b of the circuit breaker 43 arranged on the circulation duct 37. Cool the child 33c. Also, the air supplied from the circulation duct 37 hits the rear surface 33d of the lower equipment chamber 33 and cools the rear surface 33d.

Inside the busbar room 31, a ventilation box 38 is provided at the front lower part. Ventilation holes are formed in the upper and lower plates of the ventilation box 38 . The ventilation box 38 communicates with the bus room 31 and the lower equipment room 33 .

The ventilation box 38 is provided with a circulation fan 38a. As shown in FIG. 2(a), the ventilation box 38 is provided with a circulation fan 38a. The circulation fan 38a is replaceable as one unit. The circulation fan 38 a is provided to supply the air in the lower equipment room 33 to the bus room 31 .

A ventilation guide 39 is provided below the ventilation box 38 in the lower equipment room 33 . The ventilation guide 39 is formed to guide air from the rear of the lower equipment room 33 to the ventilation box 38 by means of a circulation fan 38a. Further, the ventilation guide 39 is provided with a partition wall 39a. The partition wall 39a is provided at substantially the same position as the front panel 43a of the circuit breaker 43 arranged in the lower equipment room 33, and divides the lower equipment room 33 into two rooms in the front-rear direction of the lower equipment room 33 together with the front panel 43a. partition into.

The branch busbar room 34 is provided on the rear surface of the busbar room 31 and the two equipment rooms 32 and 33 . An inspection lid 34a for maintenance is provided on the rear surface of the branch bus chamber 34. As shown in FIG. The branch busbar chamber 34 accommodates a branch busbar 44a. The branch bus 44a is connected to the three-phase bus (R, S, T) 41 of the bus room 31 by a bushing or the like. Further, the branch bus 44a is connected to a circuit breaker 43 arranged in the lower equipment room 33 by a bushing or the like. The branch bus room 34 accommodates connection conductors 44 b and 44 c that connect the power equipment 43 in the lower equipment room 33 , the power equipment 42 in the upper equipment room 32 , and the distribution cables 48 .

Between the unit 30 and the front door 22 is a control room 28a. In the control room 28a, for example, a digital protective relay, measuring instruments for various sensors, controllers for various fans, and the like are arranged. An electronic dehumidifier, for example, may be arranged in the control room 28a. A dehumidifier that utilizes the Peltier effect, for example, can be used. The dehumidifier may be placed inside the unit 30 (for example, inside the lower equipment room 33).

A cable room 28b is provided between the unit 30 and the rear door 23, and a power distribution cable 48 for power distribution is arranged in the cable room 28b. The power distribution cable 48 is connected to the power equipment 43 in the equipment room 33 and the power equipment 42 in the equipment room 32 via the connection conductors 44 b and 44 c of the branch bus room 34 .

In FIG. 2( a ), left and right chain double-dashed lines indicate areas where the switchboard 11 is arranged. This area is an area where the switchboard 11 is arranged as a unit, and the distance between the two-dot chain lines is the width of the switchboard 11 (unit width). The width of the equipment chambers 32 and 33 and the branch busbar chamber 34 shown in FIG. Therefore, the switchboard 11 has gaps G1 on both sides of the equipment rooms 32 and 33 and the branch bus room 34 . These gaps G1 communicate the control room 28a and the cable room 28b in the front-rear direction of the switchboard 11 . In other words, the switchboard 11 has passages in the front-rear direction through which air can flow.

As shown in FIG. 3A, on the front surface of the busbar chamber 31, an opening/closing plate 31b is fixed below the opening/closing door 31a by fastening members such as screws. The opening/closing plate 31b is provided so as to block the front surface of the ventilation box 38 of the bus room 31. As shown in FIG. By removing the opening/closing plate 31b, the unit 38b of the circulation fan 38a housed in the ventilation box 38 is exposed as shown in FIG. 3(b). Therefore, it is possible to safely replace the circulation fan 38a in the bus room 31 without opening and closing the opening/closing door 31a that exposes the three-phase bus 41 shown in FIG. 2(b).

(Action)
Next, the operation of the switchboard 11 described above will be described.
As shown in FIG. 2A, the width of the unit 30, more specifically, the width of the upper equipment room 32, the lower equipment room 33, the branch bus room 34, and the cooling duct 35 is equal to the width of the area where the switchboard 11 is arranged. It is narrower than (unit width) and forms a gap G1.

As shown in FIG. 4A, by driving the ventilation fan 24a, the air inside the main body 21 is exhausted, and the outside air is drawn into the main body 21 through the ventilation unit 23b of the rear door 23. . Therefore, in this board housing 20, the air sucked from the ventilation unit 23b of the rear door 23 is exhausted to the outside of the board housing 20 by the ventilation fan 24a provided on the inner ceiling plate 24 on the side of the front door 22. be done. In other words, the ventilation unit 23b of the back door 23 works as an intake port, and the ventilation unit 26a on the front door 22 side works as an exhaust port.

Airflows A1 and A2 shown in FIG. 4(a) pass through the gap G1 shown in FIG. 2(a). Accordingly, the airflows A1 and A2 are in contact with the sides of the unit 30, specifically the sides of the upper equipment room 32, the lower equipment room 33, the branch bus room 34, and the cooling duct 35. Therefore, the heat is radiated to the airflows A1 and A2 on the side surfaces of the unit 30 . That is, the heat dissipation area of the unit 30 increases due to the gap G1. Thereby, the temperature rise inside the unit 30 is suppressed.

Airflow A1 shown in FIG. The cooling duct 35 is formed narrower than the upper equipment chamber 32 and the lower equipment chamber 33 . Thus, four sides of each cooling duct 35 are in contact with air. Therefore, the heat radiation area of the cooling duct 35 is large, and the air passing through the inside of the cooling duct 35 can be efficiently cooled.

As shown in FIG. 4B, the circulation fan 38a provided in the unit 30 forms an airflow A3 that circulates inside the unit 30. As shown in FIG. This airflow A3 passes through a pair of cooling ducts 35 . A pair of cooling ducts 35 are formed narrower than the upper equipment chamber 32 and the lower equipment chamber 33 . Therefore, the flow velocity of the airflow A3 passing through the cooling duct 35 is higher than the flow velocity of the airflow A3 in the upper equipment chamber 32, the lower equipment chamber 33, and the like. That is, in the cooling duct 35, the flow velocity of the airflow A3 increases. This increases the kinetic energy and decreases the pressure energy in the airflow A3. As a result, the pressure loss with respect to the airflow A3 is reduced, so the air volume of the airflow A3 can be increased. That is, by providing the cooling duct 35, the flow rate of the circulating airflow A3 can be increased. Therefore, the temperature rise inside the unit 30 can be suppressed.

As shown in FIG. 4(b), the circulation fan 37b of the circulation duct 37 passes air from the circulation duct 37 through the contactor 33c to which the connection terminal 43b of the electric power device 43 housed in the lower equipment chamber 33 is connected and separated. Forms stream A4. This airflow A4 can cool the contact 33c. Therefore, it is possible to suppress an increase in the internal temperature of the unit 30 .

For the opening/closing door 31a of the bus room 31 and the opening/closing doors 32a and 33a of the equipment rooms 32 and 33, it is preferable to use an opening/closing door made of a metal material (for example, aluminum) having good heat dissipation. By using an opening/closing door with good heat dissipation, heat can be dissipated through the opening/closing door, and an increase in the internal temperature of the unit 30 can be suppressed.

Next, the switchboard 12 will be described.
The switchboard 12 shown in FIGS. 5A and 5B is, for example, a switchboard. In the schematic front view of the switchboard 12 shown in FIG. 5(a), the front door 122 is omitted and the unit 130 is shown.

The switchboard 12 has a board housing 120 . The board housing 120 includes a body portion 121 in which power equipment is disposed, a front door 122 as a door body disposed on the front side of the body portion 121 (left side in FIG. 5(b)), and the body portion 121. A rear door 123 is provided as a door on the rear side (right side in FIG. 5(b)). The front door 122 and the rear door 123 are rotatably supported by the board housing 120 . The front door 122 and the rear door 123 are opened and closed by operating opening/closing levers 122a and 123a, respectively. Heat insulating materials (not shown) are attached to the inner surfaces of the front door 122 and the rear door 123 .

The board housing 120 has an inner ceiling plate 124 covering the upper surface of the main body 121 and an outer ceiling plate 125 arranged above the inner ceiling plate 124 with a gap therebetween. A heat insulating material (not shown) is attached to the inner surface of the outer ceiling plate 125 . The inner ceiling plate 124 may be formed integrally with the inner ceiling plate 24 shown in FIG. 2(b). Further, the outer ceiling plate 125 may be formed integrally with the outer ceiling plate 25 shown in FIG. 2(b).

As shown in FIG. 5B, the unit 130 is accommodated in the body portion 121. As shown in FIG. The unit 130 has a plurality of rooms that partition the interior of the unit 130 . In this embodiment, the switchboard 12 has a circulation duct 135, a bus room 131, equipment rooms 132 and 133, and a branch bus room 134 as a plurality of rooms.

The circulation duct 135 and the busbar chamber 131 are arranged adjacent to each other in the longitudinal direction of the switchboard 12 at the center of the main body 121 in the vertical direction. In this embodiment, the circulation duct 135 is arranged in the center in the vertical direction, and the busbar chamber 131 is arranged behind (on the rear side of) the circulation duct 135 . The equipment chambers 132 and 133 are arranged above and below the circulation duct 135 and the busbar chamber 131, respectively. When the equipment rooms 132 and 133 are distinguished from each other, the equipment room 132 arranged above the circulation duct 135 and the bus bar room 131 is called the upper equipment room, and the equipment room 133 arranged below is called the lower equipment room.

An opening/closing door 135a for maintenance is provided on the front surface of the circulation duct 135 .
An opening/closing door (or partition plate) 131a for maintenance is provided on the front surface of the busbar room 131 . A three-phase bus (R, S, T) 41 is housed in the bus room 131 .

Opening/closing doors 132a and 133a for maintenance are provided on the front surfaces of the equipment rooms 132 and 133, respectively. Power devices 142 and 143 are accommodated in the device rooms 132 and 133, respectively. The power devices 142 and 143 are circuit breakers (VCB), for example. It should be noted that, in the following description, the circuit breakers 142 and 143 may be described. Contactors 132e and 133e with which connection terminals 142b and 143b of power devices 142 and 143 are connected and separated are provided in the device chambers 132 and 133, respectively.

A partition wall 132b is provided in the upper equipment chamber 132 . The partition wall 132b is provided at substantially the same position as the front panel 142a of the power equipment 142, and partitions the upper equipment room 132 into two rooms along with the front panel 142a in the front-rear direction of the upper equipment room 132. FIG. A circulation fan 132c is attached to the partition wall 132b.

A guide plate 132d is attached to the partition wall 132b below the circulation fan 132c. The guide plate 132d is formed to extend rearward from the partition wall 132b. The circulation fan 132c is arranged to send air from the rear to the front of the upper equipment room 132 when driven.

The lower equipment room 133 is provided with a partition wall 133b. The partition wall 133b is provided at substantially the same position as the front panel 143a of the power device 143, and partitions the upper device room 132 into two rooms along with the front panel 143a in the front-rear direction of the lower device room 133. FIG. A circulation fan 133c is attached to the partition wall 133b.

A guide plate 133d is attached to the partition wall 133b below the circulation fan 133c. The guide plate 133d is formed to extend rearward from the partition wall 133b. The circulation fan 133c is arranged to send air from the front to the rear of the lower equipment room 133 when driven.

The branch busbar room 134 is provided on the rear surface of the busbar room 131 and the both equipment rooms 132 and 133 . An inspection lid 134 a for maintenance is provided on the rear surface of the branch bus chamber 134 . Branch busbars 144a and 144b are accommodated in the branch busbar chamber 134 . The branch busbars 144a and 144b are connected to the three-phase busbars (R, S, T) 41 of the busbar chamber 131 by bushings or the like. The branch busbars 144a and 144b are connected to circuit breakers 142 and 143 provided in the equipment rooms 132 and 133, respectively, by bushings or the like. Further, the branch bus room 134 accommodates connection conductors 144c, 144d that connect the circuit breakers 142, 143 and the power distribution cables 148a, 148b.

Between the unit 130 and the front door 122 is a control room 128a. In the control room 128a, for example, a digital protection relay, measuring instruments for various sensors, controllers for various fans, and the like are arranged. An electronic dehumidifier, for example, may be located in the control room 128a. A dehumidifier that utilizes the Peltier effect, for example, can be used. Note that the dehumidifier may be placed inside the unit 130 (for example, inside the lower equipment room 133).

A cable room 128b is provided between the unit 130 and the rear door 123, and power distribution cables 148a and 148b for power distribution are arranged in the cable room 128b. The power distribution cables 148a, 148b are connected to the circuit breakers 142, 143 of the equipment rooms 132, 133 via the connection conductors 144c, 144d of the branch bus room 134, respectively.

In FIG. 5( a ), left and right chain double-dashed lines indicate areas where the switchboard 12 is arranged. This area is an area where the switchboard 12 is arranged as a unit, and the distance between the two-dot chain lines is the width of the switchboard 12 (unit width). The equipment chambers 132 and 133 and the branch busbar chamber 134 shown in FIG. 5(b) are formed narrower than this unit width. Therefore, the switchboard 12 has gaps G2 on both sides of the equipment rooms 132 and 133 and the branch bus room 134 . These gaps G2 communicate the control room 128a and the cable room 128b in the front-rear direction of the switchboard 12 . In other words, the switchboard 12 has passages in the front-rear direction through which air can flow.

(Action)
Next, the operation of the switchboard 12 described above will be described.
As shown in FIG. 5A, the width of the unit 130, more specifically, the width of the upper equipment room 132, the lower equipment room 133, the branch bus room 134, and the circulation duct 135 is the width of the area where the switchboard 12 is arranged. It is narrower than (unit width) and forms a gap G2. Due to this gap G2, the side surface of the unit 130 of the switchboard 12 works as a heat radiation surface. Therefore, in this switchboard 12, the heat dissipation area is increased as compared with a switchboard without the gap G2. Thereby, the temperature rise inside the unit 130 is suppressed.

As shown in FIG. 6, the circulation fan 133c in the lower equipment room 133 and the circulation fan 132c in the upper equipment room 132 form an air flow A11 that circulates inside the unit . This airflow A11 can suppress the temperature rise inside the unit 130 .

Also, the circulation fan 133c of the lower equipment room 133 is arranged so as to send air from the front to the rear of the lower equipment room 133 . Therefore, the contactor 133e to which the connection terminal 143b of the electric power device 143 housed in the lower device chamber 133 is connected and separated is easily exposed to the air, and the contactor 133e can be cooled.

For the opening/closing door (or partition plate) 131a of the bus room 131 and the opening/closing doors 132a and 133a of the equipment rooms 132 and 133, it is preferable to use opening/closing doors made of a metal material (for example, aluminum) with good heat dissipation. By using an opening/closing door with good heat dissipation, heat can be dissipated through the opening/closing door, and an increase in the internal temperature of the unit 130 can be suppressed.

(Temperature measurement)
For example, as a comparative example, the inventors measured the temperature in the switchgear of Patent Document 1 described above, and compared the measured results with the measurement results of the present embodiment. The measurement points were the control rooms 28a and 128a, the contacts 32c and 132e in the upper equipment rooms 32 and 132, and the contacts 33c and 133e in the lower equipment rooms 33 and 133, respectively. Temperature measurements were taken until saturation or temperature rise limits were exceeded. control room 28a. The temperature of 128a was 24.3° C. in the comparative example and 13.4° C. in this embodiment. The temperature of the contacts 32c, 132e in the upper equipment chambers 32, 132 was 76.9°C in the comparative example, and 63.8°C in the present embodiment. The temperature of the contacts 33c, 133e in the lower equipment chambers 33, 133 was 81.9°C in the comparative example and 58.2°C in the present embodiment. At any location, the temperature rise is suppressed in this embodiment as compared with the comparative example.

As described above, according to this embodiment, the following effects are obtained.
(1) The switchboard 11 includes a panel housing 20 having a rear door 23 provided with a ventilation unit 23b and a front door 22 side provided with a ventilation fan 24a, and a panel housing 20 internally provided with at least a busbar and its a unit 30 containing power equipment connected to the bus. The unit 30 includes a bus room 31 that accommodates a three-phase bus 41, an equipment room 32 arranged above the bus room 31, an equipment room 33 arranged below the bus room 31, an equipment room 32, and a cooling duct 35 communicating with 33 . Further, the unit 30 has a circulation fan 38a that circulates the internal air. Power devices 42 and 43 are housed in the device rooms 32 and 33, respectively.

The airflows A1 and A2 driven by the ventilation fan 24a come into contact with the side surfaces of the unit 30, specifically, the four side surfaces of the upper equipment room 32, the lower equipment room 33, the branch bus room 34, and the cooling duct 35. Therefore, the heat is radiated to the airflows A1 and A2 on the side surfaces of the unit 30 . That is, the heat dissipation area of the unit 30 increases due to the gap G1. Thereby, the temperature rise inside the unit 30 can be suppressed.

(2) The circulation fan 38a provided in the unit 30 forms an air flow A3 that circulates inside the unit 30; This airflow A3 passes through a pair of cooling ducts 35 . This airflow A3 can suppress the temperature rise inside the unit 30 .

(3) The pair of cooling ducts 35 are formed narrower than the upper equipment chamber 32 and the lower equipment chamber 33 . Therefore, the flow velocity of the airflow A3 passing through the cooling duct 35 is higher than the flow velocity of the airflow A3 in the upper equipment chamber 32, the lower equipment chamber 33, and the like. That is, in the cooling duct 35, the flow velocity of the airflow A3 increases. This increases the kinetic energy and decreases the pressure energy in the airflow A3. As a result, the pressure loss with respect to the airflow A3 is reduced, so the air volume of the airflow A3 can be increased. That is, by providing the cooling duct 35, the flow rate of the circulating airflow A3 can be increased. Therefore, the temperature rise inside the unit 30 can be suppressed.

(4) The circulation fan 37b of the circulation duct 37 forms an airflow A4 that passes from the circulation duct 37 through the contactor 33c with which the connection terminal 43b of the power device 43 housed in the lower device chamber 33 is connected and separated. This airflow A4 can cool the contact 33c. Therefore, it is possible to suppress an increase in the internal temperature of the unit 30 .

(5) In the switchboard 12, the width of the unit 130, more specifically, the width of the upper equipment room 132, the lower equipment room 133, the branch bus room 134, and the circulation duct 135 is the width of the area where the switchboard 12 is arranged (unit width ) to form a gap G2. Due to this gap G2, the side surface of the unit 130 of the switchboard 12 works as a heat radiation surface. Therefore, in this switchboard 12, the heat dissipation area is increased as compared with a switchboard without the gap G2. Thereby, the temperature rise inside the unit 130 can be suppressed.

(6) The circulation fan 133c in the lower equipment room 133 and the circulation fan 132c in the upper equipment room 132 form an air flow A11 that circulates inside the unit . This airflow A11 can suppress the temperature rise inside the unit 130 .

(7) The circulation fan 133c of the lower equipment room 133 is arranged so as to send air from the front to the rear of the lower equipment room 133 . Therefore, the contactor 133e to which the connection terminal 143b of the electric power device 143 housed in the lower device chamber 133 is connected and separated is easily exposed to the air, and the contactor 133e can be cooled.

Each of the above embodiments may be implemented in the following aspects.
- The configuration of the switchboards 11 to 17 may be changed as appropriate. For example, the cooling duct 35 for the switchboard 11 (transformer secondary board) may be provided in the switchboards 12-17. Also, the circulation duct 37, the circulation fan 37b, and the guide plate 37c of the switchboard 11 may be provided on the switchboards 12-17. In addition, the switchboards 11 to 17 are not limited to the above-described transformer secondary board, distribution line board, and bus connection board, but may be a power receiving board, a transformer primary board, a station transformer board, a VCT board, etc. can.

Technical ideas that can be grasped from the above embodiments are described below.
A switchgear in which a plurality of switchboards are arranged side by side,
each of the plurality of switchboards includes a unit containing at least a busbar and power equipment connected to the busbar;
A first switchboard among the plurality of switchboards has an intake port on either one of the front surface and the rear surface, and an exhaust fan on the other of the front surface and the rear surface, and accommodates the unit. Equipped with a board housing,
The unit accommodated in the first panel housing includes a busbar chamber that accommodates the busbar, and a busbar chamber that is disposed above the busbar chamber and communicates with the busbar chamber to accommodate a first power device. a first equipment room; a second equipment room disposed below the bus room and communicating with the bus room to accommodate second power equipment; and a cooling duct communicating with the equipment room of
a second switchboard among the plurality of switchboards includes a board housing that houses the unit;
The unit of the second switchboard includes a busbar room that accommodates the busbar, and a first equipment room that is disposed above the busbar room and communicates with the busbar room and accommodates first power equipment. a second equipment room arranged below the bus room and communicating with the bus room to accommodate second power equipment; and the first equipment room and the second equipment room. Having a communicating circulation duct, a first circulation fan provided in the first equipment room, and a second circulation fan provided in the second equipment room;
A switchgear characterized by

DESCRIPTION OF SYMBOLS 10... Switchgear, 11-17... Switchboard, 20... Panel housing, 23b... Ventilation unit (inlet), 24a... Ventilation fan (exhaust fan), 30... Unit, 31... Bus room, 32... Equipment room (upper stage equipment room, first equipment room), 33 equipment room (lower equipment room, second equipment room), 35 cooling duct, 41 three-phase bus, 42, 43 power equipment.

Claims (12)

a board housing having an intake port on either one of the front surface and the rear surface, and an exhaust fan on the other of the front surface and the rear surface;
a unit that is installed in the board housing and accommodates at least a bus and power equipment connected to the bus;
with
Said unit is
a busbar room that accommodates the busbar;
a first equipment room arranged above the bus room and in communication with the bus room for accommodating first power equipment;
a second equipment room disposed below the bus room and in communication with the bus room for accommodating second power equipment;
a cooling duct communicating between the first equipment room and the second equipment room;
a first circulation fan for circulating air inside the unit;
and
The first circulation fan forms an internal air flow in which the air inside the unit is circulated only inside the unit, and
A passage through which air can flow between the front surface and the back surface of the board housing is formed by a gap between the board housing and the side surface of the unit in the board housing, and the intake port extends from the board housing. A switchgear characterized by the fact that an airflow of outside air is formed in which the air outside the board housing sucked into the inside of the switchgear is exhausted to the outside of the board housing by the exhaust fan . The cooling duct is provided on both sides in the width direction of the first equipment room and the second equipment room,
2. The method of claim 1, wherein the internal airflow passes through the cooling ducts and the external airflow passes laterally of the unit including laterally of the cooling ducts. switchgear. a board housing having an intake port on either one of the front surface and the rear surface, and an exhaust fan on the other of the front surface and the rear surface;
a unit that is installed in the board housing and accommodates at least a bus and power equipment connected to the bus;
with
Said unit is
a busbar room that accommodates the busbar;
a first equipment room arranged above the bus room and in communication with the bus room for accommodating first power equipment;
a second equipment room disposed below the bus room and in communication with the bus room for accommodating second power equipment;
a cooling duct communicating between the first equipment room and the second equipment room;
a first circulation fan for circulating air inside the unit;
and
The switchgear , wherein the first circulation fan is arranged in the busbar room and sends air from the second equipment room to the busbar room. 4. The switchgear according to claim 3 , wherein the busbar chamber is provided with a circulation box that houses the first circulation fan and an opening/closing door that covers an opening of the circulation box. The switchgear according to any one of claims 1 to 4 , wherein the cooling duct is narrower than the first equipment chamber and the second equipment chamber. The switchgear according to any one of claims 1 to 5, wherein the first equipment chamber and the second equipment chamber are formed narrower than the board housing. In the second equipment room,
a terminal portion to which the contactor of the second electric power device is connected and separated;
a supply unit that supplies air inside the second equipment chamber toward the terminal unit;
The switchgear according to any one of claims 1 to 6 , characterized by: a board housing having an intake port on either one of the front surface and the rear surface, and an exhaust fan on the other of the front surface and the rear surface;
a unit that is installed in the board housing and accommodates at least a bus and power equipment connected to the bus;
with
Said unit is
a busbar room that accommodates the busbar;
a first equipment room arranged above the bus room and in communication with the bus room for accommodating first power equipment;
a second equipment room disposed below the bus room and in communication with the bus room for accommodating second power equipment;
a cooling duct communicating between the first equipment room and the second equipment room;
a first circulation fan for circulating air inside the unit;
and
In the second equipment room,
a terminal portion to which the contactor of the second electric power device is connected and separated;
a supply unit for supplying air toward the terminal unit,
The switchgear , wherein the second equipment room has a guide plate arranged to supply air behind the second equipment room to the first circulation fan. The supply unit
a circulation duct disposed below the second power device;
a second circulation fan provided at the front end of the circulation duct and sending air toward the rear end of the circulation duct;
a guide plate provided at the rear end of the circulation duct for adjusting the air sent by the second circulation fan toward the terminal portion;
9. A switchgear according to claim 7 or 8 , characterized in that it has a board housing;
a unit that is installed in the board housing and accommodates at least a bus and power equipment connected to the bus;
with
Said unit is
a busbar room that accommodates the busbar;
a first equipment room arranged above the bus room and in communication with the bus room for accommodating first power equipment;
a second equipment room disposed below the bus room and in communication with the bus room for accommodating second power equipment;
a circulation duct communicating between the first equipment room and the second equipment room;
a first circulation fan provided in the first equipment room;
a second circulation fan provided in the second equipment room;
and
The switchgear , wherein the first circulation fan and the second circulation fan form an internal air flow in which the air inside the unit is circulated only inside the unit . a board housing;
a unit that is installed in the board housing and accommodates at least a bus and power equipment connected to the bus;
with
Said unit is
a busbar room that accommodates the busbar;
a first equipment room arranged above the bus room and in communication with the bus room for accommodating first power equipment;
a second equipment room disposed below the bus room and in communication with the bus room for accommodating second power equipment;
a circulation duct communicating between the first equipment room and the second equipment room;
a first circulation fan provided in the first equipment room;
a second circulation fan provided in the second equipment room;
and
The first circulation fan is attached to a first partition wall that partitions the first equipment room in the front-rear direction, and sends air from the rear to the front of the first equipment room. is arranged,
The second circulation fan is attached to a second partition wall that partitions the second equipment room in the front-rear direction, and sends air from the front to the rear of the second equipment room. be placed,
A switchgear characterized by a first guide plate disposed below the first circulation fan and extending from the first partition wall to the rear of the first equipment room;
a second guide plate disposed below the second circulation fan and extending from the second partition wall to the rear of the second equipment room;
12. A switchgear according to claim 11, characterized in that it comprises a

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