JP7653872B2 - Wiring installations and distributed power systems - Google Patents

Description

The present invention relates to wiring equipment and a distributed power supply system for connecting a power supply device installed outdoors a building to a branched circuit via multiple branch breakers provided in a distribution board connected to a single-phase three-wire AC line having R and T phases as voltage lines and N phase as a neutral line.

In facilities such as residences and offices, a distribution board is provided that is connected to a single-phase three-wire AC line having R and T phases as voltage lines and N phase as a neutral line. The distribution board is equipped with 100V branch breakers that are connected to the two wires of R phase or T phase and N phase, and 200V branch breakers that are connected to R phase and T phase, and each branch breaker is connected to a 100V power load device or a 200V power load device.

In addition to power load devices, power supply devices such as generators and charge/discharge devices can also be connected to the distribution board. Such power supply devices include 200V AC power supplies that are connected to three wires, R phase, T phase, and N phase, and 100V AC power supplies that are connected to two wires, R phase or T phase and N phase.

In Patent Document 1, in order to install a power supply device such as a solar cell in a facility, a dedicated breaker for the power supply device (main switch 11 for private power generation) is added to the distribution board in parallel with the branch breaker (branch switch 12) on the secondary side of the main breaker (main switch 6 for commercial power supply), and the power supply device (solar cell E2) is connected to the dedicated breaker. In this case, two voltage lines are connected to the power supply device, and the power supply device functions as a 200V AC power source.

Patent No. 3531408

When connecting a 200V AC power source to a distribution board, it is necessary to install new branch breakers connected to the R and T phases, as described in Patent Document 1. However, installing new branch breakers in a distribution board is costly. Also, there are cases where the space in the distribution board to install a new branch breaker is not available.

The present invention was made in consideration of the above problems, and its purpose is to provide wiring equipment and a distributed power system that can connect a 200V AC power source to a distribution board.

A characteristic configuration of the wiring equipment according to the present invention for achieving the above object is a wiring equipment for connecting a power supply device installed outdoors a building to a branched circuit via a plurality of branch breakers provided in a distribution board connected to a single-phase three-wire AC line having R phase and T phase as voltage lines and an N phase as a neutral line,
a connection portion connected to a dedicated circuit having an R phase and a T phase but not an N phase, the dedicated circuit being provided for connecting a specific device and branching off via one of the plurality of branch breakers;
an electrical outlet into which an electrical plug for supplying power to the specific device is inserted, the electrical outlet being electrically connected to the R phase and the T phase of the connection portion, respectively;
a connecting power line connected to the power supply device, the connecting power line including an R-phase wiring electrically connected to the R-phase of the connection portion, a T-phase wiring electrically connected to the T-phase of the connection portion, and an N-phase wiring electrically connected to an N-phase of a circuit branched off via another one of the plurality of branch breakers;
A current detection unit that detects a current flowing between the distribution board and the connection unit, or a current flowing between the connection unit and the specific device;
and an output line for transmitting the detection result of the current detection portion to the power supply device.

According to the above characteristic configuration, the power supply device is connected to a connection power line having an R-phase wiring, a T-phase wiring, and an N-phase wiring, and the R-phase wiring and the T-phase wiring are connected to a distribution board via a connection part and a dedicated circuit having an R-phase and a T-phase provided for connecting a specific device. In other words, the power supply device can be connected to the R-phase and the T-phase using an existing dedicated circuit. As a result, it is not necessary to install a special breaker for connecting the power supply device in the distribution board.
Furthermore, the current detection unit detects the current flowing between the distribution board and the connection part, or the current flowing between the connection part and the specific device, and the detection result is transmitted to the power supply device. In other words, the power supply device can determine whether or not an abnormal current is flowing in the circuit to which the specific device and the power supply device are connected. As a result, the power supply device can operate while preventing an overcurrent in the circuit to which the specific device and the power supply device are connected.
Therefore, it is possible to provide wiring equipment capable of connecting an AC 200V power source to a distribution board.

Another characteristic feature of the wiring equipment of the present invention is that the N-phase wiring is connected to the N-phase of a circuit that is connected to an electrical outlet installed outdoors in the building.

The above characteristic configuration has the advantage that when the power supply unit is installed outdoors, the work required to connect the N-phase wiring to the power supply unit can be done only outdoors.

In still another characteristic configuration of the wiring equipment according to the present invention, the connection unit, the electrical outlet, and the current detection unit are installed indoors of the building,
The connecting power line and the output line are installed from the indoors to the outdoors of the building through a through hole that penetrates the wall of the building, through which piping passes for refrigerant circulating between an indoor unit of an air conditioning unit as the specific equipment installed indoors of the building and an outdoor unit of the air conditioning unit installed outdoors of the building.

According to the above characteristic configuration, the connecting power line and the output line can be installed from indoors to outdoors through an existing through hole, and connected to a power supply device installed outdoors. In other words, there is no need to install a new through hole in the wall of the building.

The distributed power supply system according to the present invention is characterized in that it comprises the above-mentioned wiring equipment, a power supply unit, a power conversion circuit that connects the power supply unit to the connecting power line, and the power supply device having a control unit that controls the operation of the power conversion circuit.

The above characteristic configuration makes it possible to provide a distributed power supply system that includes a power supply device that is an AC 200V power supply and wiring equipment that can connect the power supply device to a distribution board.

Another characteristic feature of the distributed power supply system of the present invention is that the control unit is connected to the output line and performs a current limiting process to reduce the output current from the power conversion circuit to the connecting power line as the current flowing between the connection unit and the specific device, which can be determined based on the detected current detected by the current detection unit, increases.

According to the above characteristic configuration, the control unit of the power supply device performs a current limiting process that reduces the output current from the power conversion circuit to the connecting power line as the current flowing between the connection unit and the specific device, which can be determined based on the detected current detected by the current detection unit, increases. For example, when the current detection unit detects the current flowing between the connection unit and the specific device, the control unit of the power supply device can refer to the detected current by the current detection unit. Also, when the current detection unit detects the current flowing between the distribution board and the connection unit, the control unit of the power supply device can determine the current flowing between the connection unit and the specific device based on the detected current by the current detection unit and the output current from the power conversion circuit to the connecting power line. In other words, an increase in the current flowing in the circuit to which the specific device is connected is suppressed. As a result, the power supply device can operate while preventing an overcurrent in the circuit to which the specific device is connected.

FIG. 1 is a diagram showing a configuration of a distributed power system equipped with wiring facilities. 1 is a diagram illustrating a specific example of a wiring facility according to a first embodiment; 1 is a diagram illustrating a specific example of a wiring facility according to a first embodiment; 11A and 11B are diagrams illustrating a specific example of a wiring facility according to a second embodiment. FIG. 13 is a diagram illustrating a specific example of a wiring facility according to the second embodiment.

First Embodiment
Hereinafter, a wiring facility 10 and a distributed power system according to a first embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a diagram showing the configuration of a distributed power system including a wiring facility 10. As shown in the figure, a power supply device 20 is installed outdoors in a building 4 constituting a facility such as a residence or a business office. The power supply device 20 is connected to a distribution board 2 using the wiring facility 10. The distribution board 2 is connected to a single-phase three-wire AC line 1 having R and T phases as voltage lines and N phase as a neutral line. A plurality of branch breakers 3 are installed in the distribution board 2, but only two branch breakers 3a and 3b are shown in FIG. 1. The wiring facility 10 of this embodiment is a facility for connecting the power supply device 20 to a branched circuit via the plurality of branch breakers 3 provided in the distribution board 2. The distributed power system includes the wiring facility 10 and the power supply device 20.

In this embodiment, branch breaker 3a is for a 200V load connected to the R and T phases, and branch breaker 3b is for a 100V load connected to the R and N phases.

The wiring equipment 10 of this embodiment is equipment for connecting a power supply device 20 to a branched circuit via multiple branch breakers 3 provided in a distribution board 2. The wiring equipment 10 includes a connection unit 11, an electrical outlet 12, a connecting power line 13, a current detection unit 14, and an output line 15.

The connection part 11 is connected to a dedicated circuit 9 having an R phase and a T phase but no N phase, which is provided to connect a specific device and branches off via one of the branch breakers 3a among the multiple branch breakers 3. In this embodiment, an air conditioner 7, which is a 200V load, is provided in the facility as the specific device. Specifically, an indoor unit 7a of the air conditioner 7 is provided indoors, and an outdoor unit 7b is provided outdoors outside the wall 5. Then, through a through hole 6 provided in the wall 5, a pipe 7d through which a refrigerant flows that circulates between the indoor unit 7a of the air conditioner 7 installed indoors of the building 4 and the outdoor unit 7b of the air conditioner 7 installed outdoors of the building 4, and an electrical wiring 7e that connects the indoor unit 7a and the outdoor unit 7b are passed.

The electrical outlet 12 is electrically connected to the R phase and T phase of the connection part 11, and an electrical plug 7c that supplies power to the air conditioner 7 as a specific device is inserted into the electrical outlet 12. In the example shown in FIG. 1, the electrical outlet 12 and the electrical plug 7c are also shown with ground terminals.

The connecting power line 13 has an R-phase wiring 13r electrically connected to the R-phase of the connection part 11, a T-phase wiring 13t electrically connected to the T-phase of the connection part 11, and an N-phase wiring 13n electrically connected to the N-phase of a circuit branched off via another one of the branch breakers 3b, and is connected to the power supply unit 20. The N-phase wiring 13n is connected to the N-phase of a circuit drawn to an outdoor outlet 8 installed outdoors of the building 4. In other words, the power supply unit 20 is connected to the R-phase and T-phase via one branch breaker 3a, and is connected to the N-phase via another one branch breaker 3b.

The power supply device 20 has a power supply unit 21 having a power generation unit and a charge/discharge unit, a power conversion circuit 22 that connects the power supply unit 21 to the connecting power line 13, and a control unit 23 that controls the operation of the power conversion circuit 22.

The current detection unit 14 detects the current flowing between the distribution board 2 and the connection unit 11, or the current flowing between the connection unit 11 and a specific device. The output line 15 transmits the detection result of the current detection unit 14 to the power supply unit 20. The control unit 23 of the power supply unit 20 is connected to the output line 15, and performs a current limiting process to reduce the output current from the power conversion circuit 22 to the connecting power line 13 as the current flowing between the connection unit 11 and the specific device, which can be determined based on the detection current detected by the current detection unit 14, increases.

In the illustrated example, the sum of the current flowing from branch breaker 3a to connection 11 and the output current of power supply unit 20 (current flowing from power supply unit 20 to connection 11) flows between connection 11 and air conditioner 7 as a specific device. In other words, even if no overcurrent exceeding the allowable current flows between branch breaker 3a and connection 11 on the secondary side of branch breaker 3a, there is a possibility that an overcurrent exceeding the allowable current flows between connection 11 and air conditioner 7.

Therefore, if it is desired to suppress the current flowing between the connection part 11 and the air conditioner 7 to a value equal to or less than the allowable current there, the output current of the power supply device 20 may be suppressed as necessary. This is the current limiting process that is performed based on this idea. That is, the control unit 23 performs a current limiting process that reduces the output current from the power conversion circuit 22 to the connecting power line 13 as the current flowing between the connection part 11 and the air conditioner 7, which can be determined based on the detected current detected by the current detection unit 14, increases. For example, when the current detection unit 14 detects the current flowing between the connection part 11 and the air conditioner 7, the control unit 23 of the power supply device 20 may refer to the detected current by the current detection unit 14. Also, when the current detection unit 14 detects the current flowing between the distribution board 2 and the connection part 11 as in the illustrated example, the control unit 23 of the power supply device 20 can determine the current flowing between the connection part 11 and the air conditioner 7 based on the detected current by the current detection unit 14 and the output current from the power conversion circuit 22 to the connecting power line 13. Then, the control unit 23 of the power supply device 20 adjusts the output current from the power conversion circuit 22 to the connecting power line 13 so that the current flowing between the determined connection part 11 and the air conditioner 7 is equal to or less than the allowable current there. As a result, the power supply device 20 can operate while preventing an overcurrent in the circuit to which the air conditioner 7 is connected.

The connection unit 11, electrical outlet 12, and current detection unit 14 are installed inside the building 4, and the connecting power line 13 and output line 15 are installed from inside to outside the building 4 through a through hole 6 that penetrates the wall 5 of the building 4, through which the pipe 7d through which the refrigerant circulating between the indoor unit 7a and the outdoor unit 7b of the air conditioning device 7 passes. In this way, the connecting power line 13 and output line 15 can be installed from inside to outside through the existing through hole 6 and connected to the power supply device 20 installed outdoors. In other words, there is no need to install a new through hole in the wall 5 of the building 4.

2 and 3 are diagrams showing a specific example of the wiring equipment 10 of the first embodiment. As shown in the figures, the wiring equipment 10 has a housing 26, in which a terminal group 27, a connection section 11, a current detection section 14, and an electric outlet 12 are provided. The connection power line 13 and the output line 15 are drawn from the inside of the housing 26 to the outside. Specifically, the terminal group 27 has an R-phase terminal, a T-phase terminal, and a ground terminal, and is inserted into an air conditioner electric outlet 25 installed on the wall of a room in the building 4, for example. The R-phase terminal, the T-phase terminal, and the ground terminal of the terminal group 27 are connected to the connection section 11, and are branched at the connection section 11 into the R-phase, T-phase, and ground of the electric outlet 12, and the R-phase wiring 13r and the T-phase wiring 13t of the connection power line 13. The electric plug 7c of the air conditioner 7 can be connected to this electric outlet 12.

The current detection unit 14 of this embodiment has an R-phase detection unit 14r that detects the current flowing through the R-phase between the distribution board 2 and the connection unit 11 between the terminal group 27 and the connection unit 11. The current detection unit 14 can be realized, for example, using an instrument current transformer. The R-phase detection unit 14r has an R-phase annular iron core 16r that surrounds the R-phase wiring, and an R-phase winding 17r that is wound around the R-phase annular iron core 16r. The output line 15 has an R-phase output line 15r that is connected to the R-phase winding 17r.

Three wires, R-phase wiring 13r, T-phase wiring 13t, and R-phase output wire 15r, are pulled out from the housing 26 and connected to the power supply unit 20. These four wires are connected to the power supply unit 20 in a state where they are covered and bundled together into a single cable 18, for example. The R-phase wiring 13r and the T-phase wiring 13t are connected to the power conversion circuit 22 of the power supply unit 20. The R-phase output wire 15r is connected to the control unit 23 of the power supply unit 20.

As described above, it is possible to provide the wiring facility 10 that can connect the power supply device 20 to the R phase and the T phase by utilizing the existing dedicated circuit 9. As a result, it is not necessary to install a special breaker for connecting the power supply device 20 in the distribution board 2. In addition, the housing 26 that constitutes the wiring facility 10 is installed indoors, but the connection between the housing 26 and the power supply device 20 can be realized using a single cable 18. Furthermore, since the N-phase wiring 13n that is connected to the power supply device 20 is connected to the N phase of the circuit that is laid in the outdoor outlet 8 that is installed outdoors of the building 4, there is an advantage that the work for connecting the N-phase wiring 13n to the power supply device 20 can be done only outdoors.
In addition, the housing 26 that constitutes the wiring equipment 10 has a group of terminals 27 that are inserted into an electrical outlet 25 for an air conditioning unit installed on the wall of a room in the building 4, and also has an electrical outlet 12, and the wiring equipment 10 functions as an adapter for electrically connecting the electrical plug 7c of the air conditioning unit 7 to the branch breaker 3a.

In addition, the current detection unit 14 detects the current flowing between the distribution board 2 and the connection unit 11, or the current flowing between the connection unit 11 and the air conditioner 7, and the detection result is transmitted to the power supply unit 20. In other words, the power supply unit 20 can determine whether or not an abnormal current is flowing in the circuit to which the air conditioner 7 and the power supply unit 20 are connected. As a result, the power supply unit 20 can operate while preventing an overcurrent in the circuit to which the air conditioner 7 and the power supply unit 20 are connected.

Second Embodiment
The second embodiment differs from the above-described embodiment in the configuration of the wiring facility 10. The wiring facility 10 of the second embodiment will be described below, but a description of the same configuration as the above-described embodiment will be omitted.

4 and 5 are diagrams showing a specific example of the wiring equipment 10 of the second embodiment. The wiring equipment 10 of this embodiment includes a connection unit 11 and a current detection unit 14 on the inside of a wall surface 28 of a room of the building 4, and an electric outlet 12 on the wall surface 28. The connection power line 13 and the output line 15 are installed from the inside of the wall surface 28 toward the outside of the building 4. Specifically, the R phase and the T phase of the dedicated circuit 9 are connected to the connection unit 11, and the connection unit 11 branches into the R phase, the T phase, and the ground of the electric outlet 12, and the R phase wiring 13r and the T phase wiring 13t of the connection power line 13. The ground is also connected to the connection unit 11 and the electric outlet 12. The electric plug 7c of the air conditioning device 7 can be connected to this electric outlet 12. In this way, the wiring equipment 10 functions as an outlet box provided on the wall surface 28.

The current detection unit 14 of this embodiment has an R-phase detection unit 14r that detects the current flowing through the R phase between the distribution board 2 (branch breaker 3a) and the connection unit 11. The current detection unit 14 can be realized, for example, using an instrument current transformer. The R-phase detection unit 14r has an R-phase annular core 16r that surrounds the R-phase wiring, and an R-phase winding 17r that is wound around the R-phase annular core 16r. The output line 15 has an R-phase output line 15r that is connected to the R-phase winding 17r.

The three wires, the R-phase wiring 13r, the T-phase wiring 13t, and the R-phase output wire 15r, are connected to the power supply unit 20 in a state where they are each covered and bundled together into a single cable 18.

The N-phase wiring 13n connected to the power supply unit 20 is connected to the N-phase of a circuit drawn to an outdoor outlet 8 installed outside the building 4. In this way, the power supply unit 20 is connected to the R-phase and T-phase via one branch breaker 3a, and is connected to the N-phase via another branch breaker 3b.

<Another embodiment>
＜1＞
In the above embodiment, specific examples of the configurations of the wiring facility 10 and the distributed power supply system of the present invention have been given and explained, but the configurations can be changed as appropriate.
As an example, the power supply device 20 may additionally include an independent output line (not shown) that outputs power only when the power grid is interrupted. In that case, the independent output lines may be bundled together, for example, in the cable 18 and pulled from the outdoors of the building 4 to the indoors through the through hole 6, and an independent electrical outlet connected to the independent output line may be installed indoors. For example, the independent electrical outlet may be installed next to the electrical outlet 12 of the wiring facility 10. In other words, the wiring facility 10 may include an independent electrical outlet that is connected to the independent output line through which the power supply device 20 outputs power during independent operation.

In the above embodiment, an air conditioner 7 is given as an example of a specific device of the present invention, but other devices may also be used as the specific device.

In the above embodiment, a device such as a breaker that cuts off the circuit when a current of a predetermined value or more flows may be provided in the same location as the current detection unit 14. This makes it possible to prevent an overcurrent in the circuit to which the air conditioning unit 7 and the power supply unit 20 are connected.

＜2＞
In the above embodiment, the current detection unit 14 has the R-phase detection unit 14r that detects the current flowing through the R-phase. However, the current detection unit 14 may be configured to detect the current flowing through the T-phase.

＜3＞
In addition, the configurations disclosed in the above embodiments (including other embodiments, the same applies below) can be applied in combination with configurations disclosed in other embodiments, as long as no contradiction occurs. Furthermore, the embodiments disclosed in this specification are examples, and the embodiments of the present invention are not limited thereto, and can be appropriately modified within the scope that does not deviate from the purpose of the present invention.

This invention can be used in wiring equipment and distributed power systems that can connect 200V AC power to a distribution board.

1 AC line 2 Distribution board 3 Branch breaker 4 Building 5 Wall 6 Through hole 7 Air conditioning unit (specific equipment)
7a Indoor unit 7b Outdoor unit 7c Electric plug 7d Pipe 8 Outdoor outlet (electrical outlet)
9 Dedicated circuit 10 Wiring equipment 11 Connection section 12 Electrical outlet 13 Connecting power line 13n N-phase wiring 13r R-phase wiring 13t T-phase wiring 14 (14r) Current detection section 14r R-phase detection section 15 (15r) Output line 20 Power supply device 21 Power supply section 22 Power conversion circuit 23 Control section

Claims (5)

A wiring facility for connecting a power supply device installed outdoors of a building to a branched circuit via a plurality of branch breakers provided in a distribution board connected to a single-phase three-wire AC line having R and T phases as voltage lines and an N phase as a neutral line,
a connection portion connected to a dedicated circuit having an R phase and a T phase but not an N phase, the dedicated circuit being provided for connecting a specific device and branching off via one of the plurality of branch breakers;
an electrical outlet into which an electrical plug for supplying power to the specific device is inserted, the electrical outlet being electrically connected to the R phase and the T phase of the connection portion, respectively;
a connecting power line connected to the power supply device, the connecting power line including an R-phase wiring electrically connected to the R-phase of the connection portion, a T-phase wiring electrically connected to the T-phase of the connection portion, and an N-phase wiring electrically connected to an N-phase of a circuit branched off via another one of the plurality of branch breakers;
A current detection unit that detects a current flowing between the distribution board and the connection unit, or a current flowing between the connection unit and the specific device;
and an output line that transmits the detection result of the current detection unit to the power supply device. The wiring equipment according to claim 1, wherein the N-phase wiring is connected to the N-phase of a circuit connected to an electrical outlet installed outdoors of the building. the connection unit, the electrical outlet, and the current detection unit are installed indoors of the building,
3. The wiring equipment according to claim 1 or 2, wherein the connection power lines and the output lines are installed from the indoors to the outdoors of the building through a through hole that penetrates a wall of the building, through which a piping passes for flowing a refrigerant that circulates between an indoor unit of an air conditioning device as the specific device installed indoors of the building and an outdoor unit of the air conditioning device installed outdoors of the building. The wiring facility according to any one of claims 1 to 3;
A distributed power supply system comprising: a power supply unit; a power conversion circuit that connects the power supply unit to the connecting power line; and a power supply device having a control unit that controls the operation of the power conversion circuit. The control unit is connected to the output line, and performs a current limiting process to reduce the output current from the power conversion circuit to the connecting power line as the current flowing between the connection unit and the specific device, which can be determined based on the detected current detected by the current detection unit, increases. The distributed power supply system according to claim 4.

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