JP2016103976A - Distribution board - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a distribution board which attains downsizing, facilitates assembly work and reduces an installation space by accommodating a high voltage breaker, a ground overvoltage relay and the like in a distribution board of one housing in addition to an inverter, a filter, a control circuit and a transformer which configure a power conditioner to be used for a photovoltaic power generation system.SOLUTION: The power conditioner including the inverter for converting DC power from a solar panel into AC power, the transformer for boosting the AC power outputted from the power conditioner to high voltage power and the breaker which is disposed between the transformer and an existent power system, are accommodated in one distribution board. The distribution board is formed from a chamber for accommodating the power conditioner therein and a chamber for accommodating the breaker and the relay therein, and the transformer is disposed at a rear side of the chamber for accommodating the breaker and the relay therein.SELECTED DRAWING: Figure 3

Description

  The present invention converts a DC power obtained from a solar panel into an AC power by a power conditioner (also referred to as a PCS (Power Conditioning System)) in a photovoltaic power generation system, and these devices are arranged and connected to the power system. It relates to the switchboard.

In recent years, the spread of solar power generation systems has been increasing against the background of increasing awareness of environmental conservation, such as international efforts to reduce CO _{2 to} prevent global warming. In this solar power generation system, solar light energy is converted to DC power by a solar cell module, and this DC power is converted to AC power by a power conditioner and connected to an electric power system for sale.

  Specifically, the power conditioner includes an inverter that receives the output of the solar cell and converts it into a predetermined alternating current, and converts the output of the inverter into a system voltage by a transformer and is connected to the power system.

The configuration of the power conditioner is composed of an inverter, a filter, a control circuit, a transformer, and the like, and the output voltage of the solar panel is converted into an AC voltage by the inverter and output.
In addition, in the “renewable energy feed-in tariff system”, in the case of a power conditioner of 10 kW or more, a transformer or a circuit breaker for connecting to a 6,600 V power system is required. In addition, a power conditioner, a transformer, a circuit breaker, or the like may be individually installed. However, as described in Patent Document 1 (Japanese Patent No. 5177882), it is conceivable to integrate them into a package.
However, in the configuration of Patent Document 1, workability is complicated because each device is divided and arranged.

Japanese Patent No. 517782

  In Patent Document 1, the power flowing from the outside of the panel casing, such as a solar cell in photovoltaic power generation, is changed to low-voltage AC power, the low-voltage AC power is changed to higher-voltage AC power, and the high-voltage AC power is changed to the panel. For distribution boards that transmit power outside the chassis, a low-voltage AC power converter and a high-voltage AC power module are installed in the panel chassis, a transformer is installed outside the panel chassis, and the low-voltage cable and high-voltage cable are positioned across the panel chassis. In parallel, the low conversion section, the high power transmission section, and the transformer are arranged in this order to achieve simultaneous miniaturization of the panel, improvement of cooling efficiency, and suppression of inadvertent contact. The panel housing 2, the low-voltage AC power conversion unit 3 that changes the DC power from outside the panel housing 2 to the low AC power L, and the low-voltage AC power L from the low-voltage AC power conversion unit 3 Transformer 4 to be changed to H and high voltage AC power H from transformer 4 It has a high-voltage AC power unit 5 that transmits power to the outside of the housing 2, a low-voltage AC power conversion unit 3 and a high-voltage AC power unit 5 are provided in the panel housing 2, and a transformer 4 is attached to the outside of the panel housing 2. The cable 6L and the high voltage cable 6H are arranged in parallel at positions extending inside and outside the panel housing 2, and are arranged in a predetermined direction in the order of the low voltage AC power conversion unit 3, the high voltage AC power unit 5, and the transformer 4. It is described that.

  An object of the present invention is to provide a high-voltage circuit breaker, a ground fault overvoltage relay, etc. in a single switchboard in addition to an inverter, a filter, a control circuit, and a transformer that constitute a power conditioner used in a photovoltaic power generation system. The purpose of the present invention is to provide a switchboard that is reduced in size, facilitates assembly work, and reduces installation space.

  In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above-described problems. To give an example, a power conditioner having an inverter that converts DC power from a solar panel into AC power, and output from the power conditioner. A transformer that boosts AC power to high voltage power and a circuit breaker disposed between the transformer and an existing power system are housed in one switchboard. Further, in the above distribution board, the distribution board is formed of a chamber for storing a power conditioner and a chamber for storing a circuit breaker and a relay, and a transformer is disposed behind the chamber for storing the circuit breaker and the relay. It is characterized by that.

  In addition to the inverters, filters, control circuits, and transformers that make up the power conditioner used in the photovoltaic power generation system, high voltage circuit breakers, ground fault overvoltage relays, etc. are housed in one switchboard. It was possible to reduce the copper loss of the switchboard as a whole and to reduce the size of the switchboard.

  In addition, the switchboard is composed of a casing using a metal frame, so that the control panel can be easily attached and the work efficiency is improved. In addition, since the shape and arrangement of the hanging ears arranged on the roof of the switchboard are arranged to increase the strength against the pulling force, the switchboard itself can be suspended and transported and moved without being divided.

The connection block diagram of the switchboard of a solar power generation system is shown. The schematic block diagram of the switchboard of this invention is shown. The front view of the longitudinal cross-section which has arrange | positioned the apparatus specifically to the switchboard is shown. The side view of a switchboard is shown. The external appearance perspective view of a switchboard is shown. The perspective view of the 1st step of the assembly of a switchboard is shown. The perspective view of the 2nd step of the assembly of a switchboard is shown. The perspective view of the 3rd step of the assembly of a switchboard is shown. The perspective view of the 4th step of the assembly of a switchboard is shown. The perspective view of the 5th step of the assembly of a switchboard is shown. The perspective view of the 6th step of the assembly of a switchboard is shown. The longitudinal cross-sectional view seen from the back side of the switchboard is shown. It is the figure for demonstrating cooling of a switchboard, and the figure which shows the flow of the air when an apparatus is specifically arrange | positioned. The shape change figure of the suspension ear by the pulling force when a suspension ear is arrange | positioned in parallel with the edge of a roof on the roof of a switchboard is shown. The shape change figure of the suspension ear by the pulling force when a suspension ear is arrange | positioned on the roof of a switchboard at 45 degree inclination with respect to the edge of a roof is shown. The layout of the switchboard when one inverter is added is shown.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Example 1
In Example 1 of this invention, the structure of the switchboard which installed the apparatus used with a solar power generation system is demonstrated. FIG. 1 shows a connection configuration diagram of a distribution board of a photovoltaic power generation system. In FIG. 1, 10 is a switchboard, 11 is a power system, 12 is a circuit breaker, 13 is a transformer, 14 is a power conditioner, 15 is a ground fault overvoltage relay, and 16 is a solar panel.
The DC power output from the solar panel 16 is input to a power conditioner 14 including an inverter, a filter reactor, a filter capacitor, etc., converted into a three-phase AC by the inverter, and a harmonic component is cut by the filter circuit. . Then, the voltage is boosted by the transformer 13, converted into a system voltage, and output to the power system 11 via the circuit breaker 12. The output of the transformer 13 is connected to a ground fault overvoltage relay 15 that informs that a ground fault has occurred. In FIG. 1, MCCB is a switch such as a no-fuse breaker, MC is an electromagnetic contactor, and INV is an inverter.

Next, the configuration of the switchboard 10 of the power conditioner will be described with reference to FIGS. 2A to 2C and FIG.
In general, when each device shown in FIG. 1 is housed in one switchboard, there is a device such as a high voltage circuit breaker, so it is necessary to secure an insulation distance, and the size must be increased. As a result, it was difficult to move the switchboard. In order to solve this problem, the switchboard of the present invention is configured as shown in FIG. 2A.

  In FIG. 2A, FIG. 2A (a) shows the side view of schematic structure of the switchboard 10, and FIG. 2A (b) shows the front view. In the front view of the schematic configuration of FIG. 2A (b), the power conditioner 14 is disposed in the space on the right side of the switchboard 10, and the cooling fan 18 is disposed on the upper side of the power conditioner 14. Moreover, the circuit breaker 19 and the relay 20 are arrange | positioned in the left space of the switchboard 10, and the heat shielding board 21 is arrange | positioned between the left and right spaces of the switchboard 10. Further, in the side view of the schematic configuration in FIG. 2A (a), a transformer 17 (corresponding to 13 in FIG. 1) is arranged on the rear side of the circuit breaker 19 and the relay 20 in the left space of the switchboard 10. Yes. The transformer 17 is configured not to be surrounded by the side plate and the back plate of the switchboard 10 but to be exposed to the outside air. 2A (a) and (b), the horizontal width of the switchboard is approximately 2400 mm, the height is approximately 2600 mm, and the depth is approximately 1400 mm.

  Next, FIG. 2B shows a front view of a longitudinal section of the front surface in which specific devices are arranged on the switchboard 10. In FIG. 2B, a power conditioner 14 such as an instrument panel 42 is disposed in the space on the right side of the switchboard 10, and a cooling fan 18 is disposed on the ceiling portion where the power conditioner 14 is disposed, that is, above the roof 30. Yes. Here, the space on the right side of the switchboard is referred to as a power conditioner storage space. In the space on the left side of the switchboard 10, an LBS (high-pressure air load switch) 22, an OCR (overcurrent relay) 23, a DGR (ground fault direction relay) 24, and an OVGR (ground fault overvoltage relay) 25 circuit breaker. And the panel which arranged the relay is arranged. Here, the space on the left side of the switchboard is called a circuit breaker and relay storage space. Further, a heat shielding plate 21 is installed between the left and right spaces of the switchboard 10 so that heat from the right space is not transmitted to the left space.

  Next, in FIG. 2C, a side view of the switchboard 10 is shown. In FIG. 2C, the right side is the front side of the switchboard 10 and the left side is the back side. 26 is a door on the front of the switchboard, 28 is a space for housing the circuit breaker and relay panel, 17 is a transformer disposed behind the space for housing the circuit breaker and relay panel, and 29 is the upper duct of the transformer , 30 is a ceiling roof, 18 is a cooling fan disposed on the upper side of the roof 30, and 31 is a hanging ear disposed at a corner of the roof 30.

As described above, the transformer 17 is not configured to be surrounded by the side plate and the back plate of the switchboard 10, but is configured to directly contact and cool the outside air around the switchboard. Since the transformer is directly in contact with the outside air as described above, the cooling fins (corrugated ribs) of the transformer are exposed to the outside of the panel and cooled. There is no need. However, the charging part such as the bushing of the transformer 17 is provided inside the switchboard 10 to provide insulation protection. Further, by installing the transformer 17 on the switchboard base 40, the entire switchboard can be transported integrally.
In addition, the roof 30 is formed to have a slope by making the thickness of the front surface portion thicker than that of the back surface portion, so that it flows down during rain.

  Next, FIG. 3 shows an external perspective view of the switchboard 10 of the present invention. The switchboard 10 shown in FIG. 3 is an apparatus and panel in which a power conditioner device that converts DC power from the solar panel 16 into AC power is disposed in a space on the right side when viewed from the front, with the overall outer shape being a rectangular parallelepiped shape. Is arranged. Reference numeral 261 denotes a door of the inverter storage space, and reference numeral 263 denotes a handle. Circuit breakers such as LSB, OCR, PGR, and OVGR and relays are arranged in the space on the left side of the switchboard 10, and a transformer 17 is arranged on the rear side. Reference numeral 262 denotes a door of a space for accommodating a circuit breaker and a relay, and 264 is a handle. On the roof 30 of the switchboard 10, the cooling fan 18 is disposed on the upper side of the power conditioner storage space, and the hanging ears 31 are disposed at each corner. The hanging ear will be described later.

(Example 2)
Next, assembly of the switchboard according to the second embodiment of the present invention will be described with reference to FIGS. 4A to 4F.
FIG. 4A is a perspective view illustrating a process of assembling the transformer 17 and the PCS housing frame 41 on the base 40. In FIG. 4A, a base 40 is an L-shaped or U-shaped metal frame, which forms a rectangular frame as a whole, a frame for forming a power conditioner storage space, a frame for installing the transformer 17, and a cut-off The base 40 of the switchboard 10 is configured by fitting a frame that forms a space for storing the device and the relay into the rectangular frame of the base 40.

  Then, on this base 40, an inverter 43, an inverter input / output panel 44, and a power conditioner instrument panel 42 are arranged, and a power conditioner frame 41, which is a rectangular parallelepiped frame, is formed on the base 40. Install the inverter 43 and the like. In addition, the transformer 17 is installed on the base 40 at the left back of the switchboard 10, and a transformer upper duct connecting portion 45 is disposed around the terminal plate 46 at the top of the transformer 17. The transformer upper duct connecting portion 45 is an L-shaped or U-shaped metal frame, and is formed in a square frame.

  Next, in the state of FIG. 4A, the process of arrange | positioning a partition plate to the front side side of the transformer 17 is shown to FIG. 4B, and is demonstrated. FIG. 4B shows a perspective view in which a partition plate 47 that partitions the circuit breaker or relay housing space on the left side of the switchboard 10 and the transformer 17 is arranged. The partition plate 47 is formed of a metal plate so as not to affect the circuit breaker or the relay due to the magnetic field lines generated in the transformer 17.

  Next, the step of arranging the transformer upper duct 48 in the state where the partition plate 47 of FIG. 4B is installed is shown in FIG. 4C and will be described. FIG. 4C shows a perspective view in which the transformer upper duct 48 is arranged on the transformer upper duct connecting portion 45 arranged around the terminals of the transformer 17. In FIG. 4C, the transformer upper duct 48 is a rectangular parallelepiped. The square hole 481 is formed at the portion corresponding to the terminal portion of the transformer 17 and the hole 482 is also formed on the back side. The transformer upper duct 48 is placed on the transformer upper duct connecting portion 45 from above, and the mating surface is fixed with screws.

  Next, a process of arranging the heat shielding plate 21 that partitions the PCS storage space of the switchboard 10 from the circuit breaker and relay storage space in a state where the transformer upper duct 48 is fixed is shown in FIG. 4D and will be described. In FIG. 4D, the heat shielding board 21 is arrange | positioned in the boundary of a power conditioner storage space, a circuit breaker, and a relay storage space. The heat shielding plate 21 is provided to prevent the heat generated in the inverter storage space from being transmitted to the circuit breaker and relay storage space. This will be described later. In addition, a power conditioner storage space side plate formed of a metal plate is disposed on the side surface of the power conditioner storage space, and is fixed with screws.

  Next, in the state where the heat shielding plate 21 and the side plate for the power conditioner storage space are arranged in FIG. 4D, the front plate 50 and the back plate 51 are arranged in the power conditioner storage space, and the circuit breaker and relay storage space are provided. The process of arranging the circuit breaker and relay panel 53 and arranging the front plate 52 of the circuit breaker and relay housing space is shown in FIG. 4E and will be described. In FIG. 4E, the front plate 50 of the inverter storage space forms a rectangular frame, and is brought into contact with the base 40 and the side plate 49 and fixed with screws. The back plate 51 of the inverter storage space is formed by bending a metal plate into a U shape, and is fixed to each of the base 40, the side plate 49, and the heat shield plate 21 by screws.

  Further, the front plate 52 of the circuit breaker / relay housing space is bent into a L-shape by bending the side plate, and a large rectangular hole is formed on the front surface of the front plate to arrange the door 262. It abuts against the face plate 50 and the partition plate 47 and is fixed by screws. The circuit breaker and relay panel 53 is arranged and fixed on the frame on the rear side of the front plate 50.

Next, the front panel, side panel and rear panel of the switchboard 10 are arranged and fixed, and the inverter, power conditioner device panel, inverter input / output panel, transformer, circuit breaker, relay panel, etc. are arranged in the panel. In this state, the step of arranging the roof is shown in FIG. 4F and will be described. FIG. 4F shows that the cooling fan 18 is placed on the upper side of the power conditioner on the upper side of the state in which the respective devices are arranged in the lower side of the front panel 50, 52, the side panel 49 and the rear panel 51. The perspective view which arrange | positions the roof 30 arrange | positioned to is shown. In addition, hanging ears 31 are arranged at each corner of the roof, and are used when the switchboard 10 is moved by being suspended by a crane or the like.
The above is the description of the assembly of the switchboard 10.

Example 3
A relationship among the transformer, the transformer upper duct connecting portion, and the transformer upper duct according to the third embodiment of the present invention will be described with reference to FIG. FIG. 5 shows a view from the back side of the switchboard 10. In FIG. 5, the left side is a power conditioner storage space, 55 indicates a resistor panel in which resistors are arranged, and 44 is an inverter input / output panel. The right side of the switchboard 10 includes a transformer upper duct connecting portion 45 that connects the transformer 17 and the transformer upper duct 48. The transformer upper duct 48 is provided with high-voltage equipment such as a connection bar, high-voltage CT, and ZPD (capacitor-type ground fault detection device). .

Moreover, as shown in the perspective view of FIG. 4C, the transformer upper duct connecting portion 45 is arranged such that the terminals on the primary side and the secondary side of the transformer 17 are aligned. Since the transformer 17 is connected to the connection bar of the transformer upper duct 48, the high voltage CT and the ZPD from the primary side and the secondary side, the connection line has a minimum length.
Therefore, such a configuration has an effect of reducing the copper loss of the entire switchboard.

Example 4
Next, cooling of the switchboard 10 according to the fourth embodiment of the present invention will be described with reference to FIG.
6A is a conceptual diagram for explaining cooling of the switchboard 10, and FIG. 6B shows a flow 54 of cooling air when the PCS instrument panel of the switchboard 10 is mounted. In FIG. 6A, the device that generates the most heat in the power conditioner storage space and the circuit breaker and relay storage space of the switchboard 10 is the inverter of the power conditioner, and the next is the transformer. Since the transformer 17 is cooled by using the cooling fins by touching the outside air as described above, it is not necessary to use a cooling fan or an air conditioner.

  However, since the inverter 43 generates a large amount of heat and is disposed in the switchboard 10, it is necessary to cool it using a cooling fan. In the fourth embodiment, the cooling fan 18 is arranged above the power conditioner storage space of the roof 30 and air is sucked up by the cooling fan 18 from below the power conditioner storage space to be cooled. In addition, since the heat shielding plate 21 is disposed between the inverter storage space and the circuit breaker and relay storage space, the circuit breaker and the heat generator are smaller in heat generation and lower in temperature than the power inverter storage space having a higher temperature. Heat is not transmitted to the relay storage space. By providing the heat shielding plate 21 in this manner, the inverter 43 can be concentrated and cooled by the air flow 54.

  FIG. 6B shows a switchboard configuration in which a power conditioner instrument panel 42 is arranged in the power conditioner storage space of the switchboard 10, and a circuit breaker and a relay panel 28 are arranged with the heat shield plate 21 interposed therebetween. As described above, the air holes 56 are arranged on the lower side panel or the side plate of the switchboard so that the air flows from the lower side to the upper side by the cooling fan 18. With such a configuration, it is possible to concentrate cooling of power conditioner equipment, particularly the inverter, and the heat shielding plate 21 can eliminate the influence of heat on the circuit breaker or relay having a small heat generation amount.

(Example 5)
Next, the hanging ears arranged at the corners of the roof when the switchboard 10 according to the fifth embodiment of the present invention is suspended or installed by a crane or the like will be described with reference to FIGS. 7 and 8. 7 (a) and 8 (a) are top views of the roof 30 of the switchboard 10, and FIGS. 7 (b) and 8 (b) are deformed by the tensile force when the hanging ears are suspended. The shape is shown. The hanging ear 31 used in Example 5 is a projecting plate material having a semicircular tip, and a round hole for passing a wire or the like through the semicircular portion.

  In the case of the hanging ear shown in FIG. 7A, that is, when the thickness direction of the hanging ear 31 arranged at each corner of the roof 30 is arranged parallel to the short side of the roof 30 and the switchboard 10 is suspended, Analysis revealed that the shape shown in FIG. 7A (b) was obtained by the pulling force applied to the ear 31.

Further, in the case of the hanging ear shown in FIG. 7B (a), that is, the thickness direction of the hanging ear 31 disposed at each corner of the roof 30 is inclined by 45 ° with respect to the short side of the roof 30 so as to be directed toward the center. To place. In such a configuration, when the switchboard 10 is hung from one point above the roof 30 through the wire 31 such as a wire through the hanging ear 31 of each corner, the hanging ear 31 becomes thicker in the force load direction. Therefore, the strength has increased.
When the switchboard 10 is suspended in the configuration of FIG. 7B (a), the hanging ear 31 is shown in FIG. 7B (b). Therefore, it has the effect of obtaining sufficient suspension strength. As described above, in the distribution board structure of the present invention, downsizing can be realized, and the strength of the hanging ear of the distribution board 10 can be ensured.

Example 6
Next, the structure of Example 6 of this invention is demonstrated using FIG. 8, FIG. 8 (a) is a side view of the switchboard, and FIG. 8 (b) is a front view. In FIG. 8B, the sixth embodiment shows a configuration in which one inverter storage space is increased in parallel to the configuration of the first embodiment. When two inverters 14 are used, they are connected in parallel as shown in FIG. 8B. Further, when the power conditioner 14 is additionally used, three power conditioners 14 are connected in parallel. Further, the left circuit breaker, relay storage space, and transformer location are the same as those in the first embodiment as shown in FIG. As described above, when the power conditioner 14 is added, workability can be improved by using a switchboard other than one power conditioner as an integral switchboard.

DESCRIPTION OF SYMBOLS 10 ... Distribution board 11 ... Power system 12 ... Circuit breaker 13, 17 ... Transformer 14 ... Power conditioner 15 ... Ground fault overvoltage relay 16 ... Solar panel 18 ... Cooling fan 19 ... Circuit breaker 20 ... Relay 21 ... Heat shield plate 22・ ・ ・ LBS (High pressure air load switch)
23 ... OCR (overcurrent relay)
24 DGR (Ground fault relay)
25 ... OVGR (Ground fault overvoltage relay)
26 ... Door 28 ... Relay storage board 29, 48 ... Transformer upper duct 30 ... Roof 31 ... Suspension ear 261 ... Power conditioner storage space door 262 ... Breaker and relay storage space doors 263, 264 ... Handle 40 ... Base 41 · Power conditioner frame 42 · Power conditioner instrument panel 43 · Inverter 44 · Inverter input / output panel 45 · Transformer upper duct connecting portion 46 · Transformer terminal portion 47 · Partition plate 49 · Power conditioner storage space Side plate 50 for power conditioner storage space 51 Front plate for power conditioner storage space 52 Front plate 53 for circuit breaker and relay storage space Circuit breaker and relay panel 54 Air flow 55 Resistor Panel 56 Ventilation hole

In order to solve the above problems, for example, the configuration described in the claims is adopted. The present application includes a plurality of means for solving the above problems. To give an example, a power conditioner having an inverter that converts DC power into AC power, and AC power output from the power conditioner. A switchboard comprising a transformer for transforming and a circuit breaker disposed between other power systems different from the transformer, wherein one roof has a chamber for housing the power conditioner, and the circuit breaker. It is arrange | positioned so that the room | chamber which accommodates a container, and the room which accommodates the said transformer may be covered .

Claims (9)

A power conditioner having an inverter for converting DC power from solar panels into AC power;
A transformer that boosts AC power output from the power conditioner to high-voltage AC power;
A switchboard characterized in that the transformer and a circuit breaker arranged between existing power systems are housed in one switchboard. The switchboard according to claim 1,
The switchboard is formed of a chamber for storing a power conditioner and a chamber for storing a circuit breaker and a relay, and a transformer is arranged behind the chamber for storing the circuit breaker and the relay. The switchboard according to claim 2,
The switchboard is configured to be cooled by outside air. The switchboard according to claim 2,
In the switchboard, a heat shield plate is disposed between a chamber for storing a power conditioner and a chamber for storing a circuit breaker and a relay. The switchboard according to claim 1,
A distribution board characterized in that a cooling fan is arranged on a roof of the distribution board on which the power conditioner is arranged. The switchboard according to claim 1,
The hanging ears arranged at each corner of the roof of the switchboard are formed of a metal plate having a semicircular tip and a round hole, and arranged so as to have an inclination of about 45 ° with respect to the short side of the roof. A switchboard characterized by The switchboard according to claim 1,
A distribution board characterized in that an inclination is provided on a roof of the distribution board. The switchboard according to claim 2,
A switchboard comprising a transformer upper duct in which high-voltage equipment is arranged on the upper side of the transformer, and a connection line between the transformer and the high-voltage equipment is shortened. A base formed of an L-shaped or U-shaped frame body;
Assemble the chassis frame in one area of the base, place the inverter, instrument panel,
A transformer is disposed on the rear side of the other region of the base, and a transformer upper duct in which high-voltage equipment is disposed on an upper portion of the transformer;
A partition plate is disposed on the front side of the transformer, a circuit breaker and a relay panel are disposed on the front surface of the partition plate,
The switchboard characterized by covering the periphery of the switchboard with a front panel, a side panel and a back panel, and arranging a roof on the ceiling.

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