Building and power supply system

Abstract

A building according to the present invention is used by people. The building comprises: a building body that includes a plurality of dwellings (3); a parking lot that includes a plurality of parking spaces; and power discharge points (8) respectively provided for each of the plurality of parking spaces or for a pre-set number of the plurality of parking spaces. Each power discharge point (8) is associated with one of the plurality of dwellings (3), and is connected to a power reception device (70) of the associated dwelling (3) via power wiring (20). The voltage drop rate of the power wiring (20) is a first value or lower.

Description

Building and power supply system

[0001] The present disclosure relates to a building having power wiring and a power supply system.

[0002] Buildings that can receive power supply from electric vehicles are known (for example, Patent Document 1). The building described in Patent Document 1 has a power supply system that receives power from an electric vehicle. The power supply system has a charge / discharge stand.

[0003] Japanese Unexamined Patent Application Publication No. 2023-111061

[0004] An electric vehicle supplies power to a building via power wiring. When the power wiring is long, the power distribution loss cannot be ignored. When the power distribution loss is large, there is a risk that power cannot be appropriately supplied to electrical equipment in the building.

[0005] (1) A building according to one aspect of the present disclosure is a building used by people, and includes a building main body including a plurality of individual compartments, a parking lot including a plurality of parking compartments, and a discharge stand provided in each of the plurality of parking compartments or in some of the plurality of preset parking compartments. Each of the discharge stands is associated with any one of the plurality of individual compartments and is connected to a power receiving device of the associated individual compartment via power wiring, and a voltage drop rate of the power wiring is not more than a first value.

[0006] According to this configuration, since the voltage drop rate of the power wiring extending from the individual compartment to the discharge stand is not more than the first value, the power distribution loss can be suppressed. For this reason, the voltage drop of the output voltage of the electric vehicle connected to the discharge stand is suppressed. As a result, when power is supplied from the discharge stand to which the electric vehicle is connected to the building, power can be appropriately supplied to electrical equipment in the building. Note that an individual compartment is a compartment in a building that is assigned so that a person, a corporation, or an organization can exclusively use it.

[0007] Furthermore, in buildings, the length of the power wiring connecting individual compartments to the discharge stations differs for each compartment. Therefore, the voltage drop rate in the power wiring differs for each compartment. In this respect, the above configuration ensures that the voltage drop rate in the power wiring for each compartment is less than or equal to the first value. Therefore, when receiving discharge from electric vehicles, voltage variations in the power receiving equipment can be suppressed for each compartment.

[0008] (2) In the building described in (1) above, the cross-sectional area of ​​the power wiring is the size corresponding to the length of the power wiring from the individual compartment to the discharge stand associated with the individual compartment.

[0009] In a building, the length of the power wiring connecting individual compartments to discharge stations differs for each compartment. Therefore, if the cross-sectional area of ​​the power wiring connecting each compartment to the discharge station is the same, variations in power distribution losses occur when supplying power from each compartment to electric vehicles via the discharge station. In this regard, the above configuration can suppress variations in power distribution losses in each compartment when supplying power from each compartment to electric vehicles via the discharge station.

[0010] (3) In the building described in either (1) or (2) above, the building further comprises a relay section provided in the main body of the building, the power wiring comprises a first power wiring extending from the individual section to the relay section and a second power wiring extending from the relay section to the discharge stand, the second power wiring being connected to the first power wiring by the relay section.

[0011] With this configuration, the construction of the building can be carried out separately for the first power wiring connected to each individual section of the building and for the second power wiring connected to each discharge stand.

[0012] (4) In the building described in (3) above, further comprising a conduit for protecting the power wiring, wherein the conduit comprises a first conduit for protecting the first power wiring and a second conduit for protecting the second power wiring, the second conduit is buried underground with the second power wiring inserted through it, the discharge stand comprises a discharge outlet to which the second power wiring is connected and a case through which the second conduit can be inserted, and the end of the second conduit is housed in the case. With this configuration, the second power wiring can be properly protected in the portion that emerges from the ground to the surface.

[0013] (5) In the building described in (4) above, the discharge stand further comprises a base for supporting the case, the base being made of concrete and covering the lower part of the case of the discharge stand and the portion of the second conduit that exits the case into the ground.

[0014] In this configuration, the lower part of the case and the portion of the second conduit that protrudes from the case are fixed with concrete. Therefore, if an electric vehicle were to collide with the discharge stand, the discharge stand would be less likely to tip over.

[0015] (6) In the building described in (4) or (5) above, the case of the discharge stand comprises a first opening in which the discharge outlet is provided, a second opening for connection work to connect the discharge outlet and the second power wiring, and a third opening for drawing in the second power wiring. With this configuration, since the second opening for connection work is provided in the case, the work efficiency of the connection work can be improved.

[0016] (7) In a building described in any one of (4) to (6) above, the case of the discharge stand is connected to the ground by a first ground wire, and the discharge outlet is connected to the relay section provided in the building body by a second ground wire. With this configuration, when a leakage current occurs, events caused by the leakage current can be suppressed.

[0017] (8) A power supply system according to a further aspect of the present disclosure is a power supply system for a building comprising a plurality of power wirings, the building comprising a building body including a plurality of individual compartments, a parking lot including a plurality of parking spaces, and discharge stands provided in each of the plurality of parking spaces or in a predetermined number of the plurality of parking spaces, each of the discharge stands being associated with any one of the plurality of individual compartments, the power wirings connecting the discharge stands to the power receiving devices of the associated individual compartments, and the voltage drop rate of the power wirings being less than or equal to a first value. With this configuration, losses in the power wirings are suppressed, so that power can be appropriately supplied into the building from electric vehicles connected to the discharge stands.

[0018] According to the building and power supply system of this disclosure, electricity can be adequately supplied to the building from an electric vehicle.

[0019] This is a schematic diagram of a building according to the embodiment. This is a schematic diagram showing the power supply system for one dwelling unit in the building according to the embodiment. This is a schematic diagram of a discharge stand. This is a schematic diagram showing another example of the power supply system for one dwelling unit. This is a schematic diagram showing another example of a discharge stand.

[0020] The building 1 of this embodiment will be described with reference to Figures 1 to 3. In this embodiment, the parking lot 5 is one element of the building 1. In this embodiment, the electric vehicle 18 is a vehicle powered by electricity stored in a battery. Specifically, the electric vehicle 18 includes BEVs (Battery Electric Vehicles) and PHEVs (Plug-in Hybrid Electric Vehicles).

[0021] Building 1 is a building used by people. Building 1 comprises a building body 2, a parking lot 5, and a discharge stand 8. Building 1 further comprises a relay section 10 provided in the building body 2. Building 1 further comprises an electrical conduit 30.

[0022] Building 1 is equipped with a power supply system 100 that uses the battery of an electric vehicle 18 as its power source. The power supply system 100 is a wiring system that electrically connects the discharge station 8 and the individual compartment 1A of the building body 2. Through the power supply system 100, the individual compartment 1A can receive power from the electric vehicle 18.

[0023] [Building Body] As shown in Figure 1, in this embodiment, the building body 2 is a multi-unit residential building. The building body 2 includes a plurality of individual units 1A. An individual unit 1A is a unit within the building 1 that is allocated for exclusive use by an individual, corporation, or organization. In this embodiment, an individual unit 1A is a dwelling unit 3 of the multi-unit residential building.

[0024] In this embodiment, one dwelling unit 3 is associated with one parking space 6 on a one-to-one basis. Furthermore, one dwelling unit 3 is associated with one discharge stand 8 located in the parking space 6 on a one-to-one basis. Therefore, the resident of one dwelling unit 3 has exclusive use of the parking space 6 associated with that dwelling unit 3 and the discharge stand 8 associated with that dwelling unit 3.

[0025] The main building 2 draws power from the commercial power supply 13 via a distribution panel 14. Multiple dwelling units 3 receive power from the distribution panel 14. As shown in Figure 2, each dwelling unit 3 has a distribution panel 15.

[0026] Each dwelling unit 3 has a distribution board 15 connected to a distribution panel 14. The distribution board 15 distributes power to one or more electrical devices 16 in the dwelling unit 3. The electrical devices 16 in each room are connected to the distribution board 15 via outlets. The distribution board 15 also receives power from a discharge stand 8, which is associated with each dwelling unit 3 on a one-to-one basis, via a power receiving device 70. The discharge stand 8, which is associated with each dwelling unit 3 on a one-to-one basis, is connected to the distribution board 15 via power wiring 20. When the distribution board 15 does not receive power from the commercial power supply 13 but receives power from the discharge stand 8, it distributes power from the discharge stand 8 to the electrical devices 16. The distribution board 15 may distribute power from both the commercial power supply 13 and the discharge stand 8 to the electrical devices 16 simultaneously. The distribution board 15 may stop receiving power from the commercial power supply 13 based on receiving power from the discharge stand 8.

[0027] A power meter 19 is connected to the distribution board 15 to measure the amount of electricity used. The power meter 19 measures the amount of electricity consumed downstream of the distribution board 15. The power meter 19 also measures the amount of electricity supplied from the discharge stand 8. Specifically, the power meter 19 measures the amount of electricity used within the dwelling unit 3. Furthermore, the power meter 19 measures the amount of electricity supplied to the distribution board 15 by the discharge of the electric vehicle 18.

[0028] When power is supplied from the discharge stand 8, the power receiving device 70 supplies the power supplied from the discharge stand 8 to the distribution board 15, either manually or automatically. The power receiving device 70 may be connected directly to the electrical equipment 16 without going through the distribution board 15.

[0029] [Parking Lot] Parking lot 5 is provided adjacent to the main building 2. In this embodiment, parking lot 5 is provided on the ground. Parking lot 5 may be a multi-story parking garage configured to accommodate multiple cars vertically.

[0030] Parking lot 5 includes a plurality of parking spaces 6. Each parking space 6 is partitioned so that one car can be parked there. In this embodiment, the parking spaces 6 are partitioned by white lines placed on the paved ground.

[0031] In one example, the parking lot 5 is composed of multiple rows 5A. Each row 5A is composed of multiple parking spaces 6. The extension direction DX of row 5A is defined as the direction in which the multiple parking spaces 6 are lined up. The arrangement direction DY of the multiple rows 5A is defined as the direction in which the multiple rows 5A are lined up. The arrangement direction DY of the multiple rows 5A intersects with the extension direction DX of row 5A. This arrangement of multiple rows 5A reduces the variation in the length of the power wiring 20 connecting the discharge stands 8 in the multiple parking spaces 6 to the dwelling units 3 associated with the discharge stands 8, compared to the case where all the parking spaces 6 are lined up in a single row.

[0032] [Power Supply System] The power supply system 100 will be described with reference to Figures 1 and 2. The power supply system 100 includes a plurality of power wirings 20. The power supply system 100 may further include a discharge stand 8. The power supply system 100 may further include a relay unit 10, which will be described later. The power wiring 20 includes a first power wiring 21 and a second power wiring 22. The first power wiring 21 extends from the dwelling unit 3 to the relay unit 10. The first power wiring 21 is connected to the distribution board 15 in the dwelling unit 3. The second power wiring 22 extends from the relay unit 10 to the discharge stand 8. The second power wiring 22 is connected to the first power wiring 21 by the relay unit 10. The pair of the first power wiring 21 and the second power wiring 22 is fixed. That is, the first power wiring 21 is connected to the second power wiring 22, which is set in advance to be connected to the first power wiring 21.

[0033] The relay unit 10 has a plurality of terminals 10A. The number of terminals 10A is equal to the number of power wirings 20. Each terminal 10A connects one first power wiring 21 to a second power wiring 22 that is paired with the first power wiring 21. The relay unit 10 has a metal housing that accommodates the plurality of terminals 10A.

[0034] [Structure of Power Wiring] In this embodiment, the distribution board 15 of the dwelling unit 3 supplies power to the electrical equipment 16 in the dwelling unit 3. The distribution board 15 of the dwelling unit 3 also receives power from the electric vehicle 18 via the power receiving device 70. The distance from the power receiving device 70 to the discharge stand 8 is significantly larger than the distance from the distribution board 15 of the dwelling unit 3 to the electrical equipment 16 inside the dwelling unit 3. Due to the large distance from the power receiving device 70 to the discharge stand 8, there is a large power distribution loss due to voltage drop in the power wiring 20. For this reason, the power wiring 20 connecting the power receiving device 70 and the discharge stand 8 of the dwelling unit 3 has a different structure from the in-house power wiring 27 inside the dwelling unit 3. The electrical equipment 16 is connected to the in-house power wiring 27. The structure of the power wiring 20 connecting the power receiving device 70 and the discharge stand 8 of the dwelling unit 3 will be described below.

[0035] As described above, there is a risk of increased power distribution loss due to the length of the power wiring 20 connecting the power receiving device 70 of the dwelling unit 3 and the discharge stand 8 (hereinafter also referred to as the power wiring length). For this reason, the cross-sectional area of ​​the power wiring 20 is larger than the cross-sectional area of ​​the in-dwelling power wiring 27 that is wired within the dwelling unit 3. Preferably, the cross-sectional area of ​​the power wiring 20 is set such that the voltage drop rate from the dwelling unit 3 to the discharge stand 8 associated with the dwelling unit 3 is less than or equal to a first value. In one example, the first value is 2%.

[0036] The building structure 2 contains multiple dwelling units 3. In each of the multiple dwelling units 3, the power receiving device 70 of the dwelling unit 3 is connected by power wiring 20 to a discharge stand 8 associated with the dwelling unit 3. Therefore, the building 1 is equipped with multiple power wiring 20. The number of power wiring 20 is equal to the number of dwelling units 3 that are connected one-to-one to the discharge stand 8.

[0037] Furthermore, the lengths of each of the multiple power lines 20 (i.e., the power line lengths) are different. Specifically, for each of the multiple dwelling units 3, the distance between the dwelling unit 3 and the discharge stand 8 associated with it is different. Therefore, if all of the multiple power lines 20 were made of the same type of cable with the same diameter, the power distribution loss would differ in each dwelling unit 3. To suppress such variations in power distribution loss, the multiple power lines 20 have the following configuration.

[0038] The cross-sectional area of ​​the power wiring 20 is proportional to the length of the power wiring from the dwelling unit 3 to the discharge stand 8 associated with the dwelling unit 3. Therefore, the longer the power wiring length, the larger the cross-sectional area of ​​the power wiring 20.

[0039] Let's describe a specific power wiring 20. In a power wiring 20, the cross-sectional area of ​​the first power wiring 21 that constitutes the power wiring 20 is sized according to the length of the power wiring 20. Similarly, the cross-sectional area of ​​the second power wiring 22 that constitutes the power wiring 20 is sized according to the length of the power wiring 20. The first power wiring 21 and the second power wiring 22 that constitute the power wiring 20 are configured such that their respective cross-sectional areas are equal.

[0040] Then, as described above, each of the plurality of power distribution lines 20 is set so that the voltage drop rate from the residential unit 3 to the discharge stand 8 associated with the residential unit 3 is equal to or less than a first value. Specifically, it is set so that the voltage drop rate from the power receiving device 70 of the residential unit 3 to the discharge stand 8 associated with the residential unit 3 is equal to or less than the first value. In one example, the first value is 2%.

[0041] [Electrical conduit] The electrical conduit 30 protects the power distribution line 20. The electrical conduit 30 is configured so that the power distribution line 20 passes therethrough.

[0042] As shown in FIG. 2, the electrical conduit 30 includes a first electrical conduit 31 that protects the first power distribution line 21 and a second electrical conduit 32 that protects the second power distribution line 22. The first electrical conduit 31 is disposed in the building 1 with the first power distribution line 21 inserted therethrough. Preferably, in addition to the first power distribution line 21, a third ground wire 25 is inserted into the first electrical conduit 31. The third ground wire 25 connects the ground terminal provided in the power receiving device 70 and the relay unit 10. The second electrical conduit 32 is buried in the ground with the second power distribution line 22 inserted therethrough. Preferably, in addition to the second power distribution line 22, a second ground wire 24 is inserted into the second electrical conduit32. The second ground wire 24 connects the ground terminal provided in the power outlet 41 of the discharge stand 8 and the relay unit 10.

[0043] [Discharge stand] The discharge stand 8 is a facility that receives the discharge of the electric vehicle 18. The discharge stand 8 has a power outlet 41. The power outlet 41 is configured so that the discharge cable 43 of the electric vehicle18 is connected thereto.

[0044] Each of the discharge stands 8 is associated with any one of the plurality of residential units 3. Also, each of the discharge stands 8 is connected to the power receiving device 70 of the associated residential unit through the power distribution line 20.

[0045] In the present embodiment, the discharge stands 8 are provided in each of the plurality of parking sections 6. The discharge stands 8 may be provided in some of the plurality of parking sections 6 set in advance. The discharge stand 8 has one power outlet 41. One power distribution line 20 is connected to the discharge stand 8.

[0046] As shown in FIG. 3, the discharge stand 8 includes a power outlet 41 to which the second power wiring 22 is connected, and a case 44 through which the second power wiring 22 and the second wire conduit 32 can be inserted. The discharge stand 8 further includes a base 45 that supports the case 44.

[0047] The base 45 is made of concrete. The base 45 covers the lower part of the case 44 of the discharge stand 8 and the part of the second wire conduit 32 that extends from the case 44 into the ground. Crushed stones 45A are laid under the base 45.

[0048] The case 44 includes a first opening 47 where the power outlet 41 is provided, a second opening 48, and a third opening 49 for drawing in the second power wiring 22. The end of the second wire conduit 32 is accommodated in the case 44 through the third opening 49.

[0049] The second opening 48 is provided for connection work to connect the power outlet 41 and the second power wiring 22. In one example, in the case 44, the second opening 48 is provided on the surface opposite to the first opening 47. The second opening 48 is opened wide so that the connection between the wiring extending from the power outlet 41 and the second power wiring 22 can be easily made. In one example, the second opening 48 is larger than the first opening 47. The second opening 48 is sealed by a lid 48A. The third opening 49 is configured such that the second wire conduit 32 through which the second power wiring 22 is inserted can enter. The third opening 49 is provided at the lower part of the case 44.

[0050] Case 44 is connected to the ground by a first ground wire 23. The ground terminal of the discharge outlet 41 is connected to a relay unit 10 provided in the building body 2 by a second ground wire 24. [Operation of this embodiment] The length of the power wiring 20 connecting the dwelling unit 3 and the discharge stand 8 in the apartment building differs for each dwelling unit 3. If the length of the power wiring 20 is large, the voltage drop rate will be large. In that case, when supplying power from the battery of the electric vehicle 18 to the dwelling unit 3, there is a risk that the appropriate voltage power may not be supplied to the dwelling unit 3 due to the voltage drop rate. For example, if the electric vehicle 18 discharges power at 200V, the voltage at the power receiving device 70 in the dwelling unit 3 will be lower than 200V. In that case, the electrical equipment 16 in the dwelling unit 3 will not be able to operate normally. Also, even if there is a power conditioner in the dwelling unit 3, if the power conditioner does not operate normally during a power outage, there is a risk that the power supplied from the electric vehicle 18 may not be able to be converted to the appropriate voltage.

[0051] The following problems also arise in relation to the length of the power wiring 20. In a multi-unit dwelling building 1, the length of the power wiring 20 connecting the dwelling units 3 to the discharge stand 8 differs for each dwelling unit 3. As a result, the voltage drop rate of the power wiring 20 in each dwelling unit 3 differs significantly. In addition, the battery capacity of the electric vehicle 18 is large. Therefore, variations in the voltage drop rate of the power wiring 20 may cause variations in the discharge time of the electric vehicle 18 in each dwelling unit 3, or variations in the voltage at the power receiving device 70 in each dwelling unit 3. Such variations in discharge time and voltage at the power receiving device 70 between dwelling units 3 may give residents of the multi-unit dwelling the impression that the building's equipment is deteriorating.

[0052] Therefore, in the above embodiment, the voltage drop rate of the power wiring 20 in each dwelling unit 3 is less than or equal to the first value. As a result, when receiving a discharge from the electric vehicle 18, appropriate power can be supplied to the electrical equipment 16 in the dwelling unit 3. In addition, when receiving a discharge from the electric vehicle 18, voltage fluctuations in the power receiving device 70 in each dwelling unit 3 can be suppressed.

[0053] [Effects of this embodiment] (1) The building 1 comprises a building body 2, a parking lot 5, and a discharge stand 8. The discharge stand 8 is provided in each of the multiple parking spaces 6, or in some predetermined locations of the multiple parking spaces 6. Each discharge stand 8 is associated with one of the multiple dwelling units 3. Each discharge stand 8 is connected to the power receiving device 70 of the associated dwelling unit 3 via power wiring 20. The voltage drop rate of the power wiring 20 is less than or equal to a first value.

[0054] With this configuration, the voltage drop rate of the power wiring 20 extending from the dwelling unit 3 to the discharge stand 8 is less than or equal to the first value, thus suppressing power distribution losses. As a result, the voltage drop of the output voltage of the electric vehicle 18 connected to the discharge stand 8 is suppressed. This ensures that when power is supplied to the building 1 from the discharge stand 8 connected to the electric vehicle 18, power can be properly supplied to the electrical equipment 16 within the building 1.

[0055] In building 1, the length of the power wiring 20 connecting the dwelling unit 3 to the discharge stand 8 differs for each dwelling unit 3. Therefore, the voltage drop rate of the power wiring 20 differs for each dwelling unit 3. In this respect, in the above embodiment, the voltage drop rate of the power wiring 20 for each dwelling unit 3 is less than or equal to a first value. Therefore, when receiving a discharge from an electric vehicle 18, voltage variations in the power receiving device 70 can be suppressed for each dwelling unit 3.

[0056] (2) The cross-sectional area of ​​the power wiring 20 is sized according to the length of the power wiring from the dwelling unit 3 to the discharge stand 8 associated with the dwelling unit 3. In this embodiment, the power wiring 20 comprises a first power wiring 21 and a second power wiring 22. The cross-sectional area of ​​the first power wiring 21 is sized according to the length of the power wiring 20, and the cross-sectional area of ​​the second power wiring 22 is sized according to the length of the power wiring 20. The first power wiring 21 and the second power wiring 22 that constitute the power wiring 20 are configured such that their respective cross-sectional areas are equal.

[0057] In an apartment building, the length of the power wiring 20 connecting the dwelling unit 3 to the discharge stand 8 differs for each dwelling unit 3. Therefore, if the cross-sectional area of ​​the power wiring 20 connecting the dwelling unit 3 to the discharge stand 8 is the same for each dwelling unit 3, variations in power distribution losses will occur when supplying power from the dwelling unit 3 to the electric vehicle 18 via the discharge stand 8. In this respect, the above configuration makes it possible to suppress variations in power distribution losses in each dwelling unit 3 when supplying power from the dwelling unit 3 to the electric vehicle 18 via the discharge stand 8.

[0058] (3) In building 1, the power wiring 20 includes a first power wiring 21 extending from the dwelling unit 3 to the relay unit 10, and a second power wiring 22 extending from the relay unit 10 to the discharge stand 8. The second power wiring 22 is connected to the first power wiring 21 by the relay unit 10.

[0059] With this configuration, during the construction of building 1, the construction of the first power wiring 21 connected to each dwelling unit 3 of building 1 and the construction of the second power wiring 22 connected to each discharge stand 8 can be carried out separately.

[0060] (4) In building 1, the conduit 30 comprises a first conduit 31 that protects the first power wiring 21 and a second conduit 32 that protects the second power wiring 22. The second conduit 32 is buried underground with the second power wiring 22 inserted through it. The discharge stand 8 comprises a discharge outlet 41 to which the second power wiring 22 is connected and a case 44 through which the second conduit 32 can be inserted. The end of the second conduit 32 is housed in the case 44. With this configuration, the second power wiring 22 can be properly protected at the point where it emerges from the ground to the surface.

[0061] (5) The discharge stand 8 is provided with a base 45 that supports the case 44. The base 45 is made of concrete. The base 45 covers the lower part of the case 44 of the discharge stand 8 and the portion of the second conduit 32 that extends from the case 44 into the ground.

[0062] With this configuration, the lower part of the case 44 and the portion of the second conduit 32 that protrudes from the case 44 are fixed with concrete. Therefore, if the electric vehicle 18 were to collide with the discharge stand 8, the discharge stand 8 would be less likely to tip over.

[0063] (6) The case 44 of the discharge stand 8 includes a first opening 47 in which a discharge outlet 41 is provided, a second opening 48 for connection work to connect the discharge outlet 41 and the second power wiring 22, and a third opening 49 for drawing in the second power wiring 22. With this configuration, since the second opening 48 for connection work is provided in the case 44, the work efficiency of the connection work can be improved.

[0064] (7) In building 1, the case 44 of the discharge stand 8 is connected to the ground by a first ground wire 23. The discharge outlet 41 is connected to a relay unit 10 provided in the main building 2 by a second ground wire 24. With this configuration, when a leakage current occurs, events caused by the leakage current can be suppressed. One example of such an event is electric shock.

[0065] (8) The power supply system 100 includes a plurality of power wirings 20. The building 1 includes a building body 2 including a plurality of individual compartments 1A, a parking lot 5 including a plurality of parking spaces 6, and a discharge stand 8. Each discharge stand 8 is associated with one of the plurality of individual compartments 1A, and the power wiring 20 connects the discharge stand 8 to the power receiving device 70 of the associated individual compartment 1A. The voltage drop rate of the power wiring 20 is less than or equal to a first value. Such a power supply system 100 can also be applied to individual houses that have a parking lot 5. Furthermore, the power supply system 100 can also be applied to a system that electrically connects a building that does not have a parking lot 5 (hereinafter referred to as a standalone building) and a parking lot 5 that is independent of the standalone building.

[0066] According to the power supply system 100 described above, losses in the power wiring 20 are suppressed, so that power can be properly supplied to the building 1 from the electric vehicle 18 connected to the discharge stand 8. <Modification> The above embodiment is an example of the form that the building 1 may take, and is not intended to limit its form. The building 1 may take a form different from the form exemplified in the above embodiment. Examples include a form in which some of the configurations of the embodiment are replaced, changed, or omitted, or a form in which new configurations are added to the embodiment. Modifications of the embodiment are shown below.

[0067] As shown in Figure 4, the discharge station 8 may have a charging outlet 42 in addition to the discharge outlet 41. The charging outlet 42 is configured to receive the charging cable of the electric vehicle 18. In this case, the power wiring 50 for charging includes a first power wiring 51 and a second power wiring 52, similar to the power wiring 20 for discharge. The first power wiring 51 extends from the dwelling unit 3 to the relay unit 10. The second power wiring 52 extends from the relay unit 10 to the charging outlet 42 of the discharge station 8. The first power wiring 51 is connected to the distribution board 15 in the dwelling unit 3. This allows the electric vehicle 18 to be charged using the power from the commercial power supply 13 via the distribution board 15 in the dwelling unit 3. The case 44 of the discharge station 8 is configured to house the power wiring 20 for discharge and the power wiring 50 for charging.

[0068] In the example shown in Figure 4, building 1 includes a power supply system 100 for building 1 and a charging system 200 for electric vehicle 18 from building 1. The power supply system 100 includes a plurality of power wirings 20. The charging system 200 includes a plurality of power wirings 50.

[0069] In the above embodiment, a discharge stand 8 is provided for each parking space 6. However, a discharge stand 8 may be provided for a predetermined number of parking spaces 6. For example, in a parking lot 5, one multi-discharge stand 60 may be provided for two adjacent parking spaces 6. In one example, the multi-discharge stand 60 includes two discharge stands 8. The multi-discharge stand 60 can be considered as two discharge stands 8 integrated together. One dwelling unit 3 is associated one-to-one with one of the discharge stands 8 in the multi-discharge stand 60. Another dwelling unit 3 is associated one-to-one with the other discharge stand 8 in the multi-discharge stand 60.

[0070] In this case, as shown in Figure 5, the multi-discharge stand 60 has two discharge outlets 41. The multi-discharge stand 60 is installed between two parking spaces 6. The multi-discharge stand 60 can receive discharges from two electric vehicles 18 simultaneously. The case 44 of the multi-discharge stand 60 is configured to house two power wirings 20 for discharge.

[0071] In the above embodiment and its modified form, the building 1 is an apartment building. The dwelling unit 3 and the discharge stand 8 are connected by power wiring 20. Alternatively, the shops within the building 1 and the discharge stand 8 may be connected by power wiring 20. In this case, the building 1 can properly supply power to the electrical equipment 16 in each shop within the building 1.

[0072] This specification discloses the following technology: [Note 1] Note 1 is a building for human use. The building comprises a building body including a plurality of individual compartments, a parking lot including a plurality of parking spaces, and discharge stands provided in each of the plurality of parking spaces, or in a predetermined number of the plurality of parking spaces. Each of the discharge stands is associated with any one of the plurality of individual compartments and is connected via power wiring to the power receiving device of the associated individual compartment. The voltage drop rate of the power wiring is less than or equal to a first value.

[0073] [Note 2] In the building described in Note 1, the cross-sectional area of ​​the power wiring is the size corresponding to the length of the power wiring from the individual compartment to the discharge stand associated with the individual compartment.

[0074] [Note 3] The building described in Note 1 further includes a relay section provided in the building body. The power wiring includes a first power wiring extending from the individual compartment to the relay section and a second power wiring extending from the relay section to the discharge stand. The second power wiring is connected to the first power wiring by the relay section.

[0075] [Note 4] The building described in Note 3 further includes a conduit for protecting the power wiring. The conduit comprises a first conduit for protecting the first power wiring and a second conduit for protecting the second power wiring. The second conduit is buried underground with the second power wiring inserted through it. The discharge stand comprises a discharge outlet to which the second power wiring is connected and a case through which the second conduit can be inserted. The end of the second conduit is housed in the case.

[0076] [Note 5] In the building described in Note 4, the discharge stand further comprises a base for supporting the case. The base is made of concrete and covers the lower part of the case of the discharge stand and the portion of the second conduit that exits the case into the ground.

[0077] [Note 6] In the building described in Note 4 or 5, the case of the discharge stand comprises a first opening in which the discharge outlet is provided, a second opening for connection work to connect the discharge outlet and the second power wiring, and a third opening for drawing in the second power wiring.

[0078] [Note 7] In the building described in Note 4 or 5, the case of the discharge stand is connected to the ground by a first ground wire, and the discharge outlet is connected to the relay section provided in the building body by a second ground wire.

[0079] [Note 8] Note 8 is a power supply system for a building. The power supply system comprises multiple power lines. The building comprises a building body including multiple individual compartments, a parking lot including multiple parking spaces, and discharge stands provided in each of the multiple parking spaces, or in some predetermined locations of the multiple parking spaces. Each of the discharge stands is associated with one of the multiple individual compartments. The power lines connect the discharge stands to the power receiving devices of the associated individual compartments. The voltage drop rate of the power lines is less than or equal to a first value.

[0080] 1...Building, 1A...Individual section, 2...Main building, 3...Dwelling unit, 5...Parking lot, 6...Parking space, 8...Discharge stand, 10...Intermediate section, 15...Distribution board, 20...Power wiring, 21...First power wiring, 22...Second power wiring, 23...First ground wire, 24...Second ground wire, 30...Conduit, 31...First conduit, 32...Second conduit, 41...Discharge outlet, 44...Case, 45...Base, 47...First opening, 48...Second opening, 49...Third opening, 50...Power wiring, 51...First power wiring, 52...Second power wiring, 70...Power receiving device, 100...Power supply system.

Claims

1. A building for human use, comprising: a building body including a plurality of individual compartments; a parking lot including a plurality of parking spaces; and discharge stands provided in each of the plurality of parking spaces, or in a predetermined number of the plurality of parking spaces, wherein each of the discharge stands is associated with any one of the plurality of individual compartments and is connected via power wiring to the power receiving device of the associated individual compartment, and the voltage drop rate of the power wiring is less than or equal to a first value.

2. The cross-sectional area of ​​the power wiring is such that it corresponds to the length of the power wiring from the individual compartment to the discharge stand associated with the individual compartment, as described in claim 1.

3. The building according to claim 1 or 2, further comprising a relay section provided in the main body of the building, wherein the power wiring comprises a first power wiring extending from the individual section to the relay section and a second power wiring extending from the relay section to the discharge stand, and the second power wiring is connected to the first power wiring by the relay section.

4. The building according to claim 3, further comprising a conduit for protecting the power wiring, wherein the conduit comprises a first conduit for protecting the first power wiring and a second conduit for protecting the second power wiring, the second conduit is buried underground with the second power wiring inserted through it, the discharge stand comprises a discharge outlet to which the second power wiring is connected and a case through which the second conduit can be inserted, and the end of the second conduit is housed in the case.

5. The building according to claim 4, wherein the discharge stand further comprises a base for supporting the case, the base being made of concrete and covering the lower part of the case of the discharge stand and the portion of the second conduit that exits the case into the ground.

6. The building according to claim 4 or 5, wherein the case of the discharge stand comprises a first opening in which the discharge outlet is provided, a second opening for connection work to connect the discharge outlet and the second power wiring, and a third opening for drawing in the second power wiring.

7. The building according to any one of claims 4 to 6, wherein the case of the discharge stand is connected to the ground by a first ground wire, and the discharge outlet is connected to the relay section provided in the building body by a second ground wire.

8. A power supply system for a building, comprising a plurality of power wirings, wherein the building comprises a building body including a plurality of individual compartments, a parking lot including a plurality of parking spaces, and discharge stands provided in each of the plurality of parking spaces, or in a predetermined number of the plurality of parking spaces, each of the discharge stands is associated with any one of the plurality of individual compartments, the power wirings connect the discharge stands to the power receiving devices of the associated individual compartments, and the voltage drop rate of the power wirings is less than or equal to a first value.

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