Wiring unit and protection device

Abstract

To make power output from a first circuit breaker to a second circuit breaker controllable.SOLUTION: A wiring unit A1 includes a first circuit breaker 1, a second circuit breaker 2, a controller 6, and an enclosure 9. The first circuit breaker 1 has a first terminal electrically connected to a power supply, a second terminal, and a first contact part to make or break an electrical path between the first terminal and the second terminal. The second circuit breaker 2 has a third terminal electrically connected to the second terminal, a fourth terminal, and a second contact part to make or break an electrical path between the third terminal and the fourth terminal.The controller 6 controls the magnitude of the power output from the first circuit breaker 1 to the second circuit breaker 2. The enclosure 9 houses the first circuit breaker 1, the second circuit breaker 2, and the controller 6.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure generally relates to wiring devices and protection devices, and more particularly to a wiring device including a first switch and a second switch connected to the first switch, and a protection device for protecting the wiring.

Background Art

[0002] The vehicle charging device described in Patent Document 1 includes a ground-mounted transformer and a charger. The ground-mounted transformer steps down the voltage supplied from an external distribution line by a transformer and supplies the stepped-down voltage to the outside. The charger is connected to the ground-mounted transformer and charges the vehicle using the stepped-down voltage.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The vehicle charging device described in Patent Document 1 is used, for example, by connecting it to an existing distribution board in a house. However, in Patent Document 1, since there is no configuration for controlling the power used for charging by the vehicle charging device, when the vehicle charging device charges the vehicle, for example, a constant power is always supplied to the vehicle charging device.

[0005] An object of the present disclosure is to provide a wiring device capable of controlling the power output from a first switch to a second switch, and a protection device that can be used for this wiring device.

Means for Solving the Problems

[0006] The wiring device according to one aspect of the present disclosure includes a first switch, a second switch, a controller, and a housing. The first switch has a first terminal electrically connected to a power source, a second terminal, and a first contact portion that opens and closes an electric circuit between the first terminal and the second terminal. The second switch has a third terminal electrically connected to the second terminal, a fourth terminal, and a second contact portion that opens and closes an electric circuit between the third terminal and the fourth terminal. The controller controls the magnitude of the power output from the first switch to the second switch. The housing houses the first switch, the second switch, and the controller.

[0007] The protection device according to one aspect of the present disclosure includes a first wiring, a second wiring, and a protection portion. The first wiring extends from a measuring instrument that measures power or current. The second wiring is joined to the first wiring. The protection portion covers a joint portion that is a location where the first wiring and the second wiring are joined.

Advantages of the Invention

[0008] The present disclosure has the advantage that it is possible to control the power output from the first switch to the second switch.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Best Mode for Carrying Out the Invention

[0010] (Embodiment) Hereinafter, the wiring device A1 and the protection device 8 according to the embodiment will be described with reference to the drawings. However, the following embodiment is only one of various embodiments of the present disclosure. The following embodiment can be variously modified according to the design etc. as long as the object of the present disclosure can be achieved. Also, each drawing described in the following embodiment is a schematic drawing, and the ratio of the size and thickness of each component in the drawing does not necessarily reflect the actual dimensional ratio.

[0011] (Overview) The wiring device A1 of the present embodiment is a device that supplies the power received from a power source such as a commercial power system PS1 (see FIG. 2) to an external electrical device. For example, the wiring device A1 supplies the power received from the power source to a charger CH1 (see FIGS. 2 and 3). The charger CH1 charges the battery B1 (see FIGS. 2 and 3) using the power supplied from the wiring device A1. For example, an electric vehicle E1 (see FIGS. 2 and 3) is equipped with the battery B1. The electric vehicle E1 uses the power stored in the battery B1 as a power source.

[0012] That is, the electric vehicle E1 converts the electrical energy (power) output from the battery B1 as a power source into mechanical energy (driving force) by an electric motor or the like, and moves using this mechanical energy.

[0013] The wiring device A1 and the charger CH1 are installed, for example, in a residential facility such as a detached house or an apartment house, or a non-residential facility such as an office, a store, or a nursing facility. In particular, the wiring device A1 is preferably installed in an existing detached house. In the present embodiment, as an example, the case where the wiring device A1 and the charger CH1 are installed in a facility F1 which is an existing detached house will be described.

[0014] That is, the charger CH1 according to the present embodiment is used to charge the battery B1 of the electric vehicle E1 parked in the garage attached to the facility F1. The "electric vehicle" referred to in the present disclosure is, for example, an electric vehicle that runs by the output of an electric motor, or a plug-in hybrid vehicle that runs by combining the output of an engine and the output of an electric motor. Further, the electric vehicle may be a senior car, a two-wheeler (electric motorcycle), a three-wheeler, or an electric bicycle.

[0015] As shown in FIGS. 1 and 2, the wiring device A1 of the present embodiment includes a first switch 1, a second switch 2, a controller 6, and a housing 9. The first switch 1 has a first terminal 11 electrically connected to a power source (for example, a commercial power system PS1), a second terminal 12, and a first contact portion 13 that opens and closes an electric circuit between the first terminal 11 and the second terminal 12. The second switch 2 has a third terminal 21 electrically connected to the second terminal 12, a fourth terminal 22, and a second contact portion 23 that opens and closes an electric circuit between the third terminal 21 and the fourth terminal 22. The controller 6 controls the magnitude of the power output from the first switch 1 to the second switch 2. The housing 9 houses the first switch 1, the second switch 2, and the controller 6.

[0016] According to the above configuration, since the wiring device A1 includes the controller 6, it is possible to control the power output from the first switch 1 to the second switch 2. Therefore, for example, it is possible to suppress the magnitude of the power supplied from a power source such as the commercial power system PS1 to the first switch 1 from becoming excessive. Thus, it is possible to reduce the possibility that the facility F1 and the electric vehicle E1 receive power exceeding the contract power (the maximum value of the power supplied from the commercial power system PS1 to the consumer) previously agreed upon between the power company and the consumer. Therefore, it is possible to reduce the possibility that the electricity bill increases due to the received power exceeding the contract power.

[0017] In addition, the controller 6 is housed in the housing 9 together with the first switch 1 and the second switch 2, and wiring is connected to each of them. Therefore, compared with the case where the controller 6, the first switch 1, and the second switch 2 are installed individually and connected to each other, the construction is simple and the time required for construction can be shortened. Also, compared with the case where the housing containing the first switch 1 and the second switch 2 and the controller 6 are installed individually and connected to each other, the construction is simple and the time required for construction can be shortened.

[0018] (Details) (1) Overall Configuration Hereinafter, in FIG. 4, the X-axis direction is defined as the left-right direction, the Y-axis direction is defined as the front-back direction, and the Z-axis direction is defined as the up-down direction. Further, the positive direction of the X-axis is defined as right, the positive direction of the Y-axis is defined as front, and the positive direction of the Z-axis is defined as up. However, these directions are merely examples and are not intended to limit the direction during the use of the wiring device A1. Also, the arrows indicating the respective directions in the drawings are merely for explanation and do not have an actual entity.

[0019] Also, hereinafter, the wiring device A1 will be described on the assumption that it receives power by a single-phase three-wire power distribution system. However, the power distribution system is not limited to the single-phase three-wire type, and may be, for example, a single-phase two-wire type, a three-phase three-wire type, or a three-phase four-wire type.

[0020] As described above, the wiring device A1 includes the first switch 1, the second switch 2, the controller 6, and the housing 9. Also, as shown in FIGS. 1, 2, and 4, the wiring device A1 further includes the first terminal block 3, the second terminal block 4, an SPD (Surge Protective Device) 5, a spacer 7, a protection device 8, a fuse H1, a fuse cover HC1, two first current sensors CT1, CT2, and a second current sensor CT3.

[0021] The first switch 1, the second switch 2, the first terminal block 3, the second terminal block 4, the SPD 5, the controller 6, the spacer 7, the protection device 8, the fuse H1, the fuse cover HC1, the two first current sensors CT1, CT2, and the second current sensor CT3 are housed in the housing 9. These are fixed, for example, to the bottom wall 921 of the housing 9 described later.

[0022] Also, as shown in FIG. 2, the power system S1 of the present embodiment includes a wiring device A1 and a charger CH1. Further, the power system S1 includes a plurality (two in FIG. 2) of loads 507, a distribution board 506, a smart meter SM1, and a watt-hour meter M1.

[0023] Note that the power system S1 only needs to include at least the wiring device A1 and the charger CH1, and other configurations do not have to be part of the power system S1.

[0024] (2) Housing As shown in FIG. 4, the housing 9 has a cover 91 and a body 92.

[0025] The shape of the cover 91 is a triangular prism. More specifically, the shapes of the left and right side surfaces of the cover 91 are triangular shapes with a smaller width toward the lower side. The shape of the cover 91 is a triangular prism with the left and right side surfaces as the bottom surfaces. The rear surface of the cover 91 is open.

[0026] The cover 91 is attached to the body 92. The cover 91 is movable between a position covering the front surface of the body 92 and a position exposing the front surface of the body 92.

[0027] As shown in FIG. 1, the body 92 has an opening 920 on the front surface. The shape of the body 92 is a rectangular parallelepiped. The body 92 includes a bottom wall 921 and a plurality (four in FIG. 1) of side walls 922.

[0028] The shape of the bottom wall 921 is rectangular. In the present disclosure, "rectangle" is a concept including both a rectangle and a square. The thickness direction of the bottom wall 921 is along the front-rear direction. When viewed from the front, the bottom wall 921 has four sides.

[0029] The four sides of the bottom wall 921 correspond one-to-one with the four side walls 922. From each side, the corresponding side wall 922 protrudes forward. The region surrounded by the four side walls 922 is the above-mentioned opening 920.

[0030] The bottom wall 921 has a plurality (four in the illustrated example) of mounting holes. Two of the four mounting holes are daruma holes 9210. The remaining two of the four mounting holes are round holes 9211. Screws are passed through each mounting hole and penetrate the wall W1 (outer wall) of the facility F1 (see FIG. 3) (see FIG. 4). Thereby, the housing 9 is fixed to the wall W1 of the facility F1.

[0031] Note that the housing 9 may have an inner cover that is disposed between the body 92 and the cover 91 and covers the opening 920 of the body 92.

[0032] (3) Lead-in wire As shown in FIG. 3, in the facility F1, for example, outside a building, a smart meter SM1 and a watt-hour meter M1 are installed.

[0033] A lead-in wire 501 is electrically connected to the smart meter SM1. As an example, the lead-in wire 501 is an overhead lead-in wire. One end of the lead-in wire 501 is electrically connected to a low-voltage distribution line (for example, an AC distribution line for 100V or 200V) of the commercial power system PS1, and the other end is electrically connected to the smart meter SM1.

[0034] One end of a first connection wiring 503 is electrically connected to the smart meter SM1. The other end of the first connection wiring 503 is electrically connected to the watt-hour meter M1.

[0035] One end of a second connection wiring 505 is electrically connected to the watt-hour meter M1. The other end of the second connection wiring 505 is electrically connected to a plurality of first terminals 11 (see FIG. 2) of the first switch 1 of the wiring device A1.

[0036] The commercial power system PS1 is electrically connected to a plurality of first terminals 11 of the first switch 1 via the lead-in wire 501, the first connection wiring 503, and the second connection wiring 505. Also, the power supplied from the commercial power system PS1 to the plurality of first terminals 11 of the first switch 1 is measured by the smart meter SM1 and the watt-hour meter M1.

[0037] The smart meter SM1 and the watt-hour meter M1 measure the power (electric energy per unit time) of the target circuit. Here, the smart meter SM1 and the watt-hour meter M1 integrate and measure the power (for example, the unit is W) of the target circuit. The smart meter SM1 has a communication function. The watt-hour meter M1 is a power meter without a communication function.

[0038] (4) First switch As shown in FIGS. 1 and 2, the first switch 1 has a plurality (three in FIG. 2) of first terminals 11, a plurality (three in FIG. 2) of second terminals 12, a first contact portion 13, a housing 14, a handle 15, and a trip button 16.

[0039] The three first terminals 11 are electrically connected to the commercial power system PS1. Each of the three first terminals 11 is electrically connected to the wiring of phase L1, the wiring of phase L2, and the neutral phase wiring.

[0040] The three second terminals 12 correspond one-to-one with the three first terminals 11.

[0041] The first contact portion 13 (switch) is configured to be switchable between a closed state and an open state. The closed state is a state in which the corresponding first terminal 11 and second terminal 12 are electrically connected to each other. The open state is a state in which the corresponding first terminal 11 and second terminal 12 are electrically insulated from each other.

[0042] When the first contact portion 13 is in the closed state, each of the three second terminals 12 is electrically connected to the wiring of phase L1, the wiring of phase L2, and the neutral phase wiring.

[0043] Hereinafter, the first terminal 11 and the second terminal 12 electrically connected to the wiring of the L1 phase are respectively referred to as the first terminal 11 and the second terminal 12 of the L1 phase. Also, the first terminal 11 and the second terminal 12 electrically connected to the wiring of the L2 phase are respectively referred to as the first terminal 11 and the second terminal 12 of the L2 phase. Similarly, the first terminal 11 and the second terminal 12 electrically connected to the wiring of the N phase are respectively referred to as the first terminal 11 and the second terminal 12 of the N phase. In FIG. 2, the wirings between the watt-hour meter M1 and the three first terminals 11 are labeled with the symbols [L1], [L2], and [N] corresponding to the L1 phase, L2 phase, and N phase, respectively.

[0044] The housing 14 houses the three first terminals 11, the three second terminals 12, and the first contact portion 13.

[0045] The handle 15 is disposed on the surface of the housing 14. The handle 15 receives the operation of the operator. The first contact portion 13 switches between a closed state and an open state in response to the operation on the handle 15.

[0046] The trip button 16 is disposed on the surface of the housing 14. When the trip button 16 is operated, the first switch 1 trips.

[0047] (5) Second switch As shown in FIGS. 1 and 2, the second switch 2 includes a plurality (two in FIG. 2) of third terminals 21, a plurality (two in FIG. 2) of fourth terminals 22, a second contact portion 23, a housing 24, a handle 25, and a trip button 26.

[0048] One of the two third terminals 21 is electrically connected to the second terminal 12 of the L2 phase. The other of the two third terminals 21 is electrically connected to the second terminal 12 of the N phase.

[0049] The two fourth terminals 22 correspond one-to-one with the two third terminals 21.

[0050] The second contact part 23 (switch) is configured to be able to switch between a closed state and an open state. The closed state is a state in which the corresponding third terminal 21 and fourth terminal 22 are electrically connected to each other. The open state is a state in which the corresponding third terminal 21 and fourth terminal 22 are electrically insulated from each other.

[0051] The housing 24 houses two third terminals 21, two fourth terminals 22, and the second contact part 23.

[0052] The handle 25 is disposed on the surface of the housing 24. The handle 25 receives an operation by an operator. The second contact part 23 switches between the closed state and the open state in response to an operation on the handle 25.

[0053] The trip button 26 is disposed on the surface of the housing 24. When the trip button 26 is operated, the second switch 2 trips.

[0054] (6) First terminal block As shown in FIGS. 1 and 2, the first terminal block 3 has a plurality (three in FIG. 2) of fifth terminals 31 and a plurality (three in FIG. 2) of sixth terminals 32.

[0055] The three fifth terminals 31 correspond one-to-one with the three second terminals 12 of the first switch 1. Each fifth terminal 31 is electrically connected to the corresponding second terminal 12.

[0056] The three sixth terminals 32 correspond one-to-one with the three fifth terminals 31. Each sixth terminal 32 is electrically connected to the corresponding fifth terminal 31. Also, the three sixth terminals 32 are electrically connected to the distribution board 506.

[0057] The distribution board 506 supplies the power received via the three sixth terminals 32 to one or more loads 507. The load 507 is, for example, a lighting device or an air-conditioning device.

[0058] (7) Second terminal block As shown in FIGS. 1 and 2, the second terminal block 4 has a plurality (two in FIG. 2) of seventh terminals 41 and a plurality (two in FIG. 2) of eighth terminals 42.

[0059] The two seventh terminals 41 correspond one-to-one with the two fourth terminals 22 of the second switch 2. Each seventh terminal 41 is electrically connected to the corresponding fourth terminal 22.

[0060] The two eighth terminals 42 correspond one-to-one with the two seventh terminals 41. Each eighth terminal 42 is electrically connected to the corresponding seventh terminal 41. Also, the two eighth terminals 42 are electrically connected to the charger CH1.

[0061] (8) Fuse and SPD As shown in FIG. 2, the SPD 5 has a first input terminal 51, a second input terminal 52, and a ground terminal 53.

[0062] The first end of the fuse H1 is electrically connected to the seventh terminal 41 of the second terminal block 4. More specifically, the first end of the fuse H1 is electrically connected to the seventh terminal 41 electrically connected to the second terminal 12 of the L2 phase. The second end of the fuse H1 is electrically connected to the first input terminal 51 of the SPD 5.

[0063] Also, the second input terminal 52 of the SPD 5 is electrically connected to the seventh terminal 41 of the second terminal block 4. More specifically, the second input terminal 52 of the SPD 5 is electrically connected to the seventh terminal 41 electrically connected to the second terminal 12 of the N phase.

[0064] The ground terminal 53 is electrically connected to the ground.

[0065] The fuse cover HC1 (see FIG. 1) covers the fuse H1.

[0066] (9) Current Sensor Each of the two first current sensors CT1, CT2 and the second current sensor CT3 is, for example, a current transformer.

[0067] The two first current sensors CT1 and CT2 are installed on the primary side of the first switch 1. That is, the two first current sensors CT1 and CT2 are installed in the circuit between the two first terminals 11 and the commercial power system PS1. The first current sensor CT1 measures the magnitude of the current flowing through the first terminal 11 of the L1 phase. The first current sensor CT2 measures the magnitude of the current flowing through the first terminal 11 of the L2 phase.

[0068] The second current sensor CT3 is installed on the secondary side of the second terminal block 4. That is, the second current sensor CT3 is installed in the circuit between the eighth terminal 42 and the charger CH1. More specifically, the second current sensor CT3 is installed in the circuit between the eighth terminal 42 electrically connected to the second terminal 12 of the L2 phase and the charger CH1. The second current sensor CT3 measures the magnitude of the current supplied to the charger CH1.

[0069] (10) Controller (10.1) Overview of the controller The controller 6 includes a computer system having one or more processors and a memory. At least some of the functions of the controller 6 are realized by the processor of the computer system executing a program recorded in the memory of the computer system. The program may be recorded in the memory, may be provided through an electrical communication line such as the Internet, or may be provided by being recorded in a non-transitory recording medium (such as a memory card) readable by the computer system. Also, the functions of the controller 6 may be realized by a plurality of discrete components instead of the computer system.

[0070] The controller 6 is electrically connected to the second terminal 12 and operates using the power supplied from the second terminal 12. For example, the tip of the power line extending from the controller 6 may be connected to the seventh terminal 41 or the eighth terminal 42 of the second terminal block 4, and the controller 6 may be electrically connected to the second terminal 12 via the second terminal block 4.

[0071] As described above, the controller 6 controls the magnitude of the power output from the first switch 1 to the second switch 2. Here, as shown in FIG. 2, the two fourth terminals 22 of the second switch 2 are electrically connected to the charger CH1, and the power output from the first switch 1 to the second switch 2 is supplied to the charger CH1 and then from the charger CH1 to the battery B1. As a result, the controller 6 controls the magnitude of the power output from the charger CH1 to the battery B1.

[0072] The controller 6 is electrically connected to the charger CH1 via the signal line 601. The controller 6 transmits a control signal to the charger CH1 via the signal line 601. Thereby, the controller 6 controls the operation of the charger CH1 to charge the battery B1. By controlling the operation of the charger CH1 to charge the battery B1, the magnitude of the power output from the first switch 1 to the second switch 2 is controlled.

[0073] Also, the controller 6 is electrically connected to the second switch 2 via the signal line 602. When a predetermined condition is satisfied, the controller 6 transmits a control signal to the second switch 2 via the signal line 601. Thereby, the controller 6 controls the operation of the second contact portion 23 of the second switch 2 to open and close the circuit between the two third terminals 21 and the two fourth terminals 22. For example, as will be described in detail later, when an excessive current is supplied from the commercial power system PS1 to the wiring device A1, the controller 6 opens the second contact portion 23 of the second switch 2.

[0074] The controller 6 is electrically connected to the two first current sensors CT1, CT2 and the second current sensor CT3 via the signal lines 603, 604, 605. The controller 6 acquires measured values (magnitudes of currents) from the two first current sensors CT1, CT2 and the second current sensor CT3 via the signal lines 603, 604, 605.

[0075] The signal lines 603, 604, and 605 are preferably accommodated in the duct. Thereby, the possibility of noise being applied from the power line to the signal lines 603, 604, and 605 can be reduced.

[0076] The sum of the measured values of the two first current sensors CT1 and CT2 corresponds to the magnitude of the current output from the commercial power system PS1 to the first switch 1. The measured value of the second current sensor CT3 corresponds to the magnitude of the current output from the first switch 1 to the second switch 2. The value obtained by subtracting the measured value of the second current sensor CT3 from the sum of the measured values of the two first current sensors CT1 and CT2 corresponds to the magnitude of the current output from the first switch 1 to the first terminal block 3. The controller 6 calculates at least one of the magnitude of the current output from the commercial power system PS1 to the first switch 1 and the magnitude of the current output from the first switch 1 to the first terminal block 3.

[0077] Hereinafter, the sum of the measured values of the two first current sensors CT1 and CT2 is referred to as the measured current I1 (see FIG. 1). Also, the measured value of the second current sensor CT3 is referred to as the measured current I2. Also, the value obtained by subtracting the measured value of the second current sensor CT3 from the sum of the measured values of the two first current sensors CT1 and CT2 is referred to as the measured current I3. The equation I1 = I2 + I3 holds.

[0078] (10.2) Control by the Controller The controller 6 limits the magnitude of the power output from the first switch 1 to the second switch 2 according to at least one of the magnitude of the current output from the commercial power system PS1 to the first switch 1 and the magnitude of the current output from the first switch 1 to the first terminal block 3. In other words, the controller 6 limits the magnitude of the power corresponding to the measured current I2 according to at least one of the measured current I1 and the measured current I3.

[0079] Limiting the magnitude of the power means performing at least one of setting an upper limit on the magnitude of the power, reducing the magnitude of the power, and cutting off the power.

[0080] For example, the controller 6 controls the charger CH1 to limit the magnitude of the power output by the charger CH1 to the battery B1. The magnitude of the power output by the charger CH1 to the battery B1 corresponds to the magnitude of the power output from the first switch 1 to the second switch 2.

[0081] Also, for example, the controller 6 controls the second contact portion 23 of the second switch 2 to be in an open state to limit the magnitude of the power output from the first switch 1 to the second switch 2.

[0082] (10.3) Conditions for starting power limitation Next, the conditions under which the controller 6 starts the control to limit the magnitude of the power output from the first switch 1 to the second switch 2 will be described.

[0083] When the magnitude of the power supplied from the commercial power system PS1 to the first switch 1 increases, the controller 6 starts the control to limit the magnitude of the power output from the first switch 1 to the second switch 2. Thereby, it is possible to suppress the magnitude of the power supplied from the commercial power system PS1 to the first switch 1 from becoming excessive. Therefore, it is possible to reduce the possibility that the facility F1 receives power exceeding the contract power (the maximum value of the power supplied from the commercial power system PS1 to the customer) previously agreed upon between the power company and the customer.

[0084] As shown in FIG. 2, the secondary circuit of the first switch 1 branches into a circuit that supplies power to the charger CH1 and a circuit that supplies power to the distribution board 506. If a constant magnitude of power is supplied to the charger CH1 regardless of the magnitude of the power supplied to the load 507 via the distribution board 506, when the power consumption at the load 507 increases, there is a possibility that the power received by the facility F1 exceeds the contract power. For example, there is a possibility that the power received by the facility F1 exceeds the contract power during seasons when the power consumption is large, such as in summer. In contrast, by the controller 6 providing a limit to the magnitude of the power output from the first switch 1 to the second switch 2, it is possible to suppress the power received by the facility F1 from exceeding the contract power.

[0085] As an example, when the magnitudes of the currents measured by the two first current sensors CT1 and CT2 (i.e., the measured current I1) exceed a predetermined current value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2. In this case, for example, when the measured current I1 is less than or equal to the predetermined current value, the controller 6 sets the magnitude of the power output from the first switch 1 to the second switch 2 as a first power value, and when the measured current I1 exceeds the predetermined current value, the controller 6 sets the magnitude of the power output from the first switch 1 to the second switch 2 as a second power value. The second power value is smaller than the first power value.

[0086] Also, for example, when the measured current I1 exceeds the predetermined current value, the controller 6 may increase the amount of decrease in the magnitude of the power output from the first switch 1 to the second switch 2 as the difference between the measured current I1 and the predetermined current value becomes larger.

[0087] Regarding other conditions under which the controller 6 starts the control for restricting the magnitude of the power output from the first switch 1 to the second switch 2, they will be described in the modification examples below.

[0088] (11) Spacer As shown in FIGS. 1 and 5, the spacer 7 has a base 71 and a plurality (four in FIG. 5) of leg portions 72.

[0089] The shape of the base 71 is plate-like. The thickness direction of the base 71 is along the front-rear direction. The base 71 is arranged in front of the bottom wall 921 with a gap therebetween. The controller 6 is fixed to the front surface of the base 71.

[0090] The plurality of leg portions 72 project rearward from the base 71. The tips of the plurality of leg portions 72 are fixed to the bottom wall 921.

[0091] As shown in FIG. 1, the spacer 7 and the controller 6 are arranged adjacent to the first switch 1. More specifically, the spacer 7 and the controller 6 are arranged to the left of the first switch 1. Also, below the spacer 7 and the controller 6 and to the left of the first switch 1, the first terminal block 3 is arranged. To the right of the first switch 1, the second switch 2 is arranged.

[0092] As shown in FIG. 5, a plurality (three in FIG. 5) of wirings 701 are passed through the space between the base 71 and the bottom wall 921. The plurality of wirings 701 electrically connect the plurality of second terminals 12 of the first switch 1 and the plurality of fifth terminals 31 of the first terminal block 3.

[0093] (12) Charger The charger CH1 charges the battery B1 using the power supplied from the wiring device A1. Also, the charger CH1 controls the magnitude of the power supplied to the battery B1 based on a predetermined setting, a command from the controller 6, and the like.

[0094] The charger CH1 has, for example, a power conversion circuit that converts the power supplied from the wiring device A1 into power of a predetermined voltage. Also, the charger CH1 has, for example, a computer system (such as a microcontroller) for controlling the power conversion circuit.

[0095] (13) Protection device As shown in FIGS. 6 and 7, the protection device 8 includes a first wiring 81, a second wiring 82, and a protection unit 83. The protection device 8 is a device that protects the wiring (the first wiring 81 and the second wiring 82). More specifically, the protection device 8 is a device that protects the wiring (the first wiring 81 and the second wiring 82) by the protection unit 83.

[0096] The above-mentioned signal line 605 (see FIG. 1) includes a first wiring 81 and a second wiring 82 of the protection device 8. The first wiring 81 is a wiring extending from the second current sensor CT3. In commercially available current sensors, there may be a wiring attached to the current sensor. However, the length of such an attached wiring may be insufficient, and the wirings may be connected together for use. In this embodiment, the first wiring 81 extending from the second current sensor CT3 is connected to the second wiring 82.

[0097] Therefore, the first wiring 81 is a wiring extending from the measuring instrument. In this embodiment, the measuring instrument is the second current sensor CT3, which is a measuring instrument for measuring current. However, the measuring instrument may be a measuring instrument for measuring power.

[0098] The second wiring 82 is joined to the first wiring 81. In other words, the second wiring 82 is connected to the first wiring 81. The first end of the second wiring 82 is joined to the first wiring 81, and the second end of the second wiring 82 is connected to the controller 6.

[0099] The protection device 8 includes a joint portion 8a. The joint portion 8a is a location where the first wiring 81 and the second wiring 82 are joined. The joint portion 8a includes a part of the first wiring 81 and a part of the second wiring 82. Further, the joint portion 8a includes a first connector 84 and a second connector 85, which will be described later.

[0100] The protection part 83 covers the joint portion 8a. Thereby, the protection part 83 protects the first wiring 81 and the second wiring 82 from foreign matters such as water droplets and stress. Since the wiring device A1 is assumed to be installed outdoors, condensation may occur. Even if condensation occurs, since the protection part 83 covers the joint portion 8a, the joint portion 8a is prevented from getting wet. Therefore, corrosion and deterioration of the first wiring 81 and the second wiring 82 can be suppressed.

[0101] Next, the configuration of the protection device 8 will be described in more detail. In addition to the first wiring 81, the second wiring 82, and the protection part 83, the protection device 8 includes a first connector 84, a second connector 85, and a desiccant 86.

[0102] The first wiring 81 has a first core wire 811 and a first coating 812 surrounding the first core wire 811. The first core wire 811 is a conductive member such as a copper wire. The first coating 812 is formed of, for example, a synthetic resin. The first coating 812 has electrical insulation. At the tip of the first wiring 81, the first coating 812 does not exist and the first core wire 811 is exposed. More specifically, at the tip of the first wiring 81, the first coating 812 is removed.

[0103] The first connector 84 is electrically connected to the first core wire 811 at the tip of the first wiring 81.

[0104] The second wiring 82 has a second core wire 821 and a second coating 822 surrounding the second core wire 821. The second core wire 821 is a conductive member such as a copper wire. The second coating 822 is formed of, for example, a synthetic resin. The second coating 822 has electrical insulation. At the tip of the second wiring 82, the second coating 822 does not exist and the second core wire 821 is exposed. More specifically, at the tip of the second wiring 82, the second coating 822 is removed.

[0105] The second connector 85 is electrically connected to the second core wire 821 at the tip of the second wiring 82. The second connector 85 is fitted to the first connector 84 and is electrically connected to the first connector 84. Thereby, the first core wire 811 is electrically connected to the second core wire 821 via the first connector 84 and the second connector 85.

[0106] In FIG. 6, the first connector 84 is a male connector and the second connector 85 is a female connector. Conversely, the first connector 84 may be a female connector and the second connector 85 may be a male connector.

[0107] At the joint portion 8a, the first core wire 811 and the second core wire 821 are joined. More specifically, at the joint portion 8a, the first core wire 811 and the second core wire 821 are joined via the first connector 84 and the second connector 85.

[0108] The longitudinal direction of the portion of the first wiring 81 covered by the protection part 83 is along the longitudinal direction of the portion of the second wiring 82 covered by the protection part 83. The first wiring 81 and the second wiring 82 face each other in their respective longitudinal directions.

[0109] The protection part 83 includes a tape 831 wound around the joint part 8a. Further, the protection part 83 includes a protection housing 832 that covers the joint part 8a. Furthermore, the protection part 83 includes a first seal part 833 and a second seal part 834.

[0110] The tape 831 has flexibility. The shape of the tape 831 is, for example, rectangular. The tape 831 is wound in a cylindrical or spiral shape so that the joint part 8a is accommodated inside the tape 831. That is, the tip of the first core wire 811, the tip of the second core wire 821, the first connector 84, and the second connector 85 are accommodated inside the tape 831. The tape 831 has an adhesive layer on one of its surfaces, and the tape 831 is fixed in a wound state by the adhesive force of the adhesive layer.

[0111] The protection housing 832 houses the joint part 8a. Further, the protection housing 832 houses a desiccant 86. The desiccant 86 includes, for example, silica gel.

[0112] Since the wiring device A1 is assumed to be installed outdoors, the surface of the protection housing 832 preferably has water repellency.

[0113] The protection housing 832 includes a first through hole 8321 through which the first wiring 81 passes and a second through hole 8322 through which the second wiring 82 passes. The gap between the first through hole 8321 and the first wiring 81 is filled by the first seal part 833. The gap between the second through hole 8322 and the second wiring 82 is filled by the second seal part 834. Each of the first seal part 833 and the second seal part 834 is, for example, a caulking agent made of silicone or the like, or a gasket using an elastic body such as rubber.

[0114] (14) Construction The wiring device A1 of this embodiment can be used in the construction method of "Method C" shown in the technical document JWD-T33 "Construction Guidelines for Electrical Equipment for EV Normal Charging (3rd Edition)" issued by the Japan Wiring System Industry Association. Method C shows a construction example of 6kW charging equipment in existing houses.

[0115] That is, when installing the charger CH1, the wiring device A1 is connected to the existing distribution board 506 of the facility F1, and the charger CH1 is connected to the wiring device A1. As a result, it becomes possible to supply the power supplied from the commercial power system PS1 to the load 507 connected to the distribution board 506 and the charger CH1, respectively. Further, since the wiring device A1 is provided with the controller 6, the magnitude of the power supplied to the charger CH1 can be controlled by the controller 6.

[0116] (Modification example) Hereinafter, modification examples of the embodiment will be listed. The following modification examples may be realized in appropriate combinations. Hereinafter, the configuration of the above-described embodiment is referred to as a basic example. Also, hereinafter, the same components as those in the basic example are denoted by the same reference numerals and the description thereof is omitted.

[0117] (Modification example 1) In the basic example, when the measured current I1 exceeds a predetermined current value (hereinafter also referred to as a first threshold value), the controller 6 limits the magnitude of the power output from the first switch 1 to the second switch 2.

[0118] In modification example 1, the condition for the controller 6 to start the control for limiting the magnitude of the power output from the first switch 1 to the second switch 2 is different from that in the basic example. The controller 6 of this modification example 1 limits the magnitude of the power output from the first switch 1 to the second switch 2 according to the magnitudes of the currents measured by the two first current sensors CT1 and CT2 (measured current I1) and the current measured by the second current sensor CT3 (measured current I2).

[0119] More specifically, the controller 6 calculates a measured current I3, which is a current value obtained by subtracting the measured current I2 from the measured current I1. When the measured current I3 exceeds a second threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0120] For example, when the measured current I3 exceeds the second threshold value, the controller 6 restricts the magnitude of the output current of the charger CH1 such that the sum of the measured current I3 and the magnitude of the output current of the charger CH1 becomes a predetermined upper limit current value. The predetermined upper limit current value is, for example, a value equal to the second threshold value.

[0121] (Modification Example 2) In Modification Example 2, the condition for the controller 6 to start the control for restricting the magnitude of the power output from the first switch 1 to the second switch 2 is different from the basic example.

[0122] The controller 6 calculates a charging current ratio, which is a value obtained by dividing the measured current I2 by the measured current I1. When the charging current ratio exceeds a third threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0123] (Modification Example 3) Modification Example 3 illustrates a combination of the basic example, Modification Example 1, and Modification Example 2.

[0124] For example, when the measured current I1 exceeds the first threshold value and the measured current I3 exceeds the second threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0125] Also, for example, in any case where the measured current I1 exceeds the first threshold value or the measured current I3 exceeds the second threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0126] Thus, the condition for the controller 6 to start the control for restricting the magnitude of the power output from the first switch 1 to the second switch 2 may include, for example, at least one of the measured current I1 exceeding the first threshold value and the measured current I3 exceeding the second threshold value.

[0127] Also, the condition for the controller 6 to start the control for restricting the magnitude of the power output from the first switch 1 to the second switch 2 may include at least one of, for example, the measured current I1 exceeding the first threshold value, the measured current I3 exceeding the second threshold value, and the charging current ratio exceeding the third threshold value.

[0128] (Modification Example 4) In the basic example, the measured current I2 is a value measured by the second current sensor CT3. In contrast, Modification Example 4 differs from the basic example in that the measured current I2 is a value acquired by the controller 6 from the charger CH1.

[0129] The controller 6 acquires charging current information regarding the magnitude of the current output from the charger CH1 to the battery B1 from the charger CH1. The charging current information includes information indicating the value of the measured current I2, which is the magnitude of the current output from the first switch 1 to the second switch 2.

[0130] The controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2 according to the magnitude of the current (measured current I1) measured by the two first current sensors CT1 and CT2 and the charging current information (measured current I2) acquired from the charger CH1.

[0131] For example, similar to Modification Example 1, the controller 6 calculates the measured current I3, which is the current value obtained by subtracting the measured current I2 from the measured current I1. When the measured current I3 exceeds the second threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0132] Further, for example, similar to Modification 2, the controller 6 calculates a charging current ratio which is the value obtained by dividing the measured current I2 by the measured current I1. When the charging current ratio exceeds a third threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0133] (Modification 5) As shown in FIG. 2, the controller 6 of this Modification 5 has an input unit 61. The input unit 61 is, for example, a wireless communication module. The input unit 61 communicates wirelessly with the smart meter SM1. Specifically, the input unit 61 can communicate with the smart meter SM1 using the B route of the smart meter SM1. The input unit 61 acquires information (signal Sig1) regarding the magnitude of the current output from the commercial power system PS1 to the first switch 1 from the smart meter SM1.

[0134] Then, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2 according to the magnitude of the current measured by the smart meter SM1.

[0135] The controller 6 uses the magnitude of the current measured by the smart meter SM1 as the measured current I1. That is, in Modification 5, the measured current I1 is the magnitude of the current measured by the smart meter SM1, which is different from the basic example in this regard.

[0136] Then, for example, similar to the basic example, when the measured current I1 exceeds a predetermined current value (first threshold value), the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0137] Further, for example, similar to Modification 1, the controller 6 calculates a measured current I3 which is the current value obtained by subtracting the measured current I2 from the measured current I1. When the measured current I3 exceeds a second threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0138] Also, for example, similar to Modification Example 2, the controller 6 calculates a charging current ratio, which is a value obtained by dividing the measured current I2 by the measured current I1. When the charging current ratio exceeds a third threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0139] (Modification Example 6) In the basic example and Modification Examples 1 to 5, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2 according to the magnitude of the current. In contrast, the controller 6 of this Modification Example 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2 according to the magnitude of the power.

[0140] That is, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2 according to at least one of the magnitude of the power output from the commercial power system PS1 to the first switch 1 and the magnitude of the power output from the first switch 1 to the first terminal block 3.

[0141] For example, when at least one of the magnitude of the power output from the commercial power system PS1 to the first switch 1 exceeds a first power threshold value and the magnitude of the power output from the first switch 1 to the first terminal block 3 exceeds a second power threshold value, the controller 6 restricts the magnitude of the power output from the first switch 1 to the second switch 2.

[0142] The magnitude of the power output from the commercial power system PS1 to the first switch 1 is a value obtained by multiplying the measured current I1 by the voltage value. The magnitude of the power output from the first switch 1 to the first terminal block 3 is a value obtained by multiplying the measured current I3 by the voltage value.

[0143] By replacing the measured currents I1 to I3 in the basic example and Modification Examples 1 to 5 with the magnitudes of the power measured at their respective positions, the conditions for starting the control to restrict the magnitude of the power output from the first switch 1 to the second switch 2 in the basic example and Modification Examples 1 to 5 are also applicable to this Modification Example 6.

[0144] (Other Modification Examples) The following lists other modification examples of the embodiments.

[0145] The power supply to which the first terminal 11 of the first switch 1 is electrically connected is not limited to the commercial power system PS1, and may be, for example, a self - power generation facility.

[0146] It is not essential that the housing 9 of the wiring device A1 be attached to the wall W1 of the facility F1. The housing 9 may be placed, for example, on the ground or the floor surface. Also, the housing 9 may be installed outdoors or indoors.

[0147] At least one of the first switch 1 and the second switch 2 may be a leakage breaker.

[0148] Each of the two first current sensors CT1, CT2 and the second current sensor CT3 is not limited to a current transformer, and may be, for example, a sensor that converts the voltage drop by a shunt resistor into a current, or a Hall - element current sensor.

[0149] Only one of the smart meter SM1 and the watt - hour meter M1 may be installed in the facility F1.

[0150] The protection device 8 is not limited to being applied to the wiring between the controller 6 and the second current sensor CT3, and may be applied to other wirings in the wiring device A1.

[0151] The controller 6 in the present disclosure includes a computer system. The computer system mainly includes a processor and a memory as hardware. By the processor executing a program recorded in the memory of the computer system, at least part of the functions as the controller 6 in the present disclosure are realized. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunication line, or may be provided by being recorded in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). Here, integrated circuits such as the IC or LSI mentioned here have different names depending on the degree of integration, and include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Furthermore, for an FPGA (Field-Programmable Gate Array) that is programmed after the manufacture of the LSI, or a logic device capable of reconfiguring the bonding relationship inside the LSI or reconfiguring the circuit section inside the LSI, it can also be adopted as a processor. The one or more electronic circuits may be integrated on one chip, or may be provided distributed on a plurality of chips. The plurality of chips may be integrated in one device, or may be provided distributed in a plurality of devices. The computer system mentioned here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0152] (Summary) From the embodiments and the like described above, the following aspects are disclosed.

[0153] The wiring device (A1) according to the first aspect includes a first switch (1), a second switch (2), a controller (6), and a housing (9). The first switch (1) has a first terminal (11) electrically connected to a power source (commercial power system PS1), a second terminal (12), and a first contact portion (13) that opens and closes an electric circuit between the first terminal (11) and the second terminal (12). The second switch (2) has a third terminal (21) electrically connected to the second terminal (12), a fourth terminal (22), and a second contact portion (23) that opens and closes an electric circuit between the third terminal (21) and the fourth terminal (22). The controller (6) controls the magnitude of the power output from the first switch (1) to the second switch (2). The housing (9) houses the first switch (1), the second switch (2), and the controller (6).

[0154] According to the above configuration, since the wiring device (A1) includes the controller (6), it is possible to control the power output from the first switch (1) to the second switch (2). Therefore, for example, it is possible to suppress the magnitude of the power supplied from the power source (commercial power system PS1) to the first switch (1) from becoming excessive.

[0155] Also, in the wiring device (A1) according to the second aspect, in the first aspect, the fourth terminal (22) is electrically connected to a charger (CH1). The charger (CH1) can charge a battery (B1). The controller (6) controls the magnitude of the power output from the charger (CH1) to the battery (B1).

[0156] According to the above configuration, for example, it is possible to suppress the magnitude of the power output to the battery (B1) from becoming excessive.

[0157] Also, in the wiring device (A1) according to the third aspect, in the second aspect, the controller (6) controls the operation of the charger (CH1) to charge the battery (B1).

[0158] According to the above configuration, for example, it is possible to suppress the magnitude of the power output to the battery (B1) from becoming excessive.

[0159] Further, in the wiring device (A1) according to the fourth aspect, in any one of the first to third aspects, the controller (6) controls an operation in which the second contact portion (23) opens and closes an electric circuit between the third terminal (21) and the fourth terminal (22).

[0160] According to the above configuration, the controller (6) can open the second contact portion (23) to prevent power from being output from the first switch (1) to the second switch (2).

[0161] Further, the wiring device (A1) according to the fifth aspect further includes a terminal block (first terminal block 3) in any one of the first to fourth aspects. The terminal block (first terminal block 3) has a fifth terminal (31) electrically connected to the second terminal (12) and a sixth terminal (32) electrically connected to the fifth terminal (31). The terminal block (first terminal block 3) is housed in the housing (9). The controller (6) limits the magnitude of the power output from the first switch (1) to the second switch (2) according to at least one of the magnitude of the current output from the power supply (commercial power system PS1) to the first switch (1) and the magnitude of the current output from the first switch (1) to the terminal block (first terminal block 3).

[0162] According to the above configuration, for example, when the magnitude of the power output from the first switch (1) to the second switch (2) is excessive, the power can be limited.

[0163] Further, the wiring device (A1) according to the sixth aspect further includes a first current sensor (CT1; CT2) in the fifth aspect. The first current sensor (CT1; CT2) is housed in the housing (9). The first current sensor (CT1; CT2) measures the magnitude of the current output from the power supply (commercial power system PS1) to the first switch (1). The controller (6) limits the magnitude of the power output from the first switch (1) to the second switch (2) when the magnitude of the current measured by the first current sensor (CT1; CT2) exceeds a predetermined current value.

[0164] According to the above configuration, when the magnitude of the power output from the first switch (1) to the second switch (2) is excessive, the power can be limited.

[0165] Further, the wiring device (A1) according to the seventh aspect further includes a first current sensor (CT1; CT2) and a second current sensor (CT3) in the fifth aspect. The first current sensor (CT1; CT2) is housed in the housing (9). The first current sensor (CT1; CT2) measures the magnitude of the current output from the power supply (commercial power system PS1) to the first switch (1). The second current sensor (CT3) is housed in the housing (9). The second current sensor (CT3) measures the magnitude of the current output from the first switch (1) to the second switch (2). The controller (6) limits the magnitude of the power output from the first switch (1) to the second switch (2) according to the magnitude of the current measured by the first current sensor (CT1; CT2) and the magnitude of the current measured by the second current sensor (CT3).

[0166] According to the above configuration, for example, when the magnitude of the power output from the first switch (1) to the second switch (2) is excessive, the power can be limited.

[0167] Further, the wiring device (A1) according to the eighth aspect further includes a first current sensor (CT1; CT2) in the fifth aspect. The first current sensor (CT1; CT2) is housed in the housing (9). The first current sensor (CT1; CT2) measures the magnitude of the current output from the power supply (commercial power system PS1) to the first switch (1). The fourth terminal (22) is electrically connected to the charger (CH1). The charger (CH1) can charge the battery (B1). The controller (6) obtains charging current information regarding the magnitude of the current output from the charger (CH1) to the battery (B1) from the charger (CH1). The controller (6) limits the magnitude of the power output from the first switch (1) to the second switch (2) according to the magnitude of the current measured by the first current sensor (CT1; CT2) and the charging current information obtained from the charger (CH1).

[0168] According to the above configuration, for example, when the magnitude of the power output from the first switch (1) to the second switch (2) is excessive, the power can be restricted.

[0169] Also, in the wiring device (A1) according to the ninth aspect, in the fifth aspect, the controller (6) has an input unit (61) that acquires information regarding the magnitude of the current output from the power supply (commercial power system PS1) to the first switch (1) from the smart meter (SM1). The controller (6) restricts the magnitude of the power output from the first switch (1) to the second switch (2) according to the magnitude of the current measured by the smart meter (SM1).

[0170] According to the above configuration, for example, when the magnitude of the power output from the first switch (1) to the second switch (2) is excessive, the power can be restricted.

[0171] Also, the wiring device (A1) according to the tenth aspect further includes a terminal block (first terminal block 3) in any one of the first to fourth aspects. The terminal block (first terminal block 3) has a fifth terminal (31) electrically connected to the second terminal (12) and a sixth terminal (32) electrically connected to the fifth terminal (31). The terminal block (first terminal block 3) is housed in the housing (9). The controller (6) restricts the magnitude of the power output from the first switch (1) to the second switch (2) according to at least one of the magnitude of the power output from the power supply (commercial power system PS1) to the first switch (1) and the magnitude of the power output from the first switch (1) to the terminal block (first terminal block 3).

[0172] According to the above configuration, for example, when the magnitude of the power output from the first switch (1) to the second switch (2) is excessive, the power can be restricted.

[0173] Also, in the wiring device (A1) according to the eleventh aspect, in any one of the first to tenth aspects, the controller (6) is electrically connected to the second terminal (12). The controller (6) operates using the power supplied from the second terminal (12).

[0174] According to the above configuration, the power supply power of the controller (6) can be easily ensured.

[0175] Regarding the configurations other than the first aspect, they are not essential configurations for the wiring device (A1) and can be appropriately omitted.

[0176] Further, the protection device (8) according to the twelfth aspect includes a first wiring (81), a second wiring (82), and a protection part (83). The first wiring (81) extends from a measuring instrument (for example, the second current sensor CT3) that measures power or current. The second wiring (82) is joined to the first wiring (81). The protection part (83) covers a joint part (8a) where the first wiring (81) and the second wiring (82) are joined.

[0177] According to the above configuration, the joint part (8a) can be protected, and corrosion and deterioration of the first wiring (81) and the second wiring (82) can be suppressed.

[0178] Also, in the protection device (8) according to the thirteenth aspect, in the twelfth aspect, the first wiring (81) has a first core wire (811) and a first coating (812) that surrounds the first core wire (811). The second wiring (82) has a second core wire (821) and a second coating (822) that surrounds the second core wire (821). At the joint part (8a), the first core wire (811) and the second core wire (821) are joined. The protection part (83) includes a tape (831) wound around the joint part (8a).

[0179] According to the above configuration, by winding the tape (831) around the joint part (8a), the joint part (8a) can be protected more reliably.

[0180] Also, in the protection device (8) according to the fourteenth aspect, in the twelfth or thirteenth aspect, the protection part (83) includes a protection housing (832) that covers the joint part (8a).

[0181] According to the above configuration, by covering the joint part (8a) with the protection housing (832), the joint part (8a) can be protected more reliably.

[0182] Regarding the configuration other than the 12th aspect, it is not an essential configuration for the protection device (8) and can be omitted as appropriate.

Explanation of Signs

[0183] 1 First switch 2 Second switch 3 Terminal block (first terminal block) 6 Controller 8 Protection device 8a Joint 9 Housing 11 First terminal 12 Second terminal 13 First contact part 21 Third terminal 22 Fourth terminal 23 Second contact part 31 Fifth terminal 32 Sixth terminal 61 Input part 81 First wiring 82 Second wiring 83 Protection part 811 First core wire 812 First coating 821 Second core wire 822 Second coating 831 Tape 832 Protection housing A1 Wiring device B1 Battery CH1 Charger CT1, CT2 First current sensor CT3 Second current sensor PS1 Commercial power system (power supply) SM1 Smart meter

Claims

1. A first switch having a first terminal electrically connected to a power source, a second terminal, and a first contact portion for opening and closing an electric circuit between the first terminal and the second terminal; A second switch having a third terminal electrically connected to the second terminal, a fourth terminal, and a second contact portion for opening and closing an electric circuit between the third terminal and the fourth terminal; A controller for controlling the magnitude of the power output from the first switch to the second switch; A housing for housing the first switch, the second switch, and the controller; and A wiring device.

2. The fourth terminal is electrically connected to a charger capable of charging a battery, The controller controls the magnitude of the power output from the charger to the battery, The wiring device according to claim 1.

3. The controller controls the operation of the charger to charge the battery, The wiring device according to claim 2.

4. The controller controls the operation of the second contact portion to open and close the electric circuit between the third terminal and the fourth terminal, The wiring device according to claim 1.

5. Further comprising a terminal block having a fifth terminal electrically connected to the second terminal and a sixth terminal electrically connected to the fifth terminal, The terminal block is housed in the housing, The controller limits the magnitude of the power output from the first switch to the second switch according to at least one of the magnitude of the current output from the power source to the first switch and the magnitude of the current output from the first switch to the terminal block, The wiring device according to claim 1.

6. Further comprising a first current sensor housed in the housing for measuring the magnitude of the current output from the power source to the first switch, When the magnitude of the current measured by the first current sensor exceeds a predetermined current value, the controller limits the magnitude of the power output from the first switch to the second switch, The wiring device according to claim 5.

7. A first current sensor housed in the housing for measuring the magnitude of the current output from the power source to the first switch, and A second current sensor housed in the housing for measuring the magnitude of the current output from the first switch to the second switch, The controller restricts the magnitude of the power output from the first switch to the second switch according to the magnitude of the current measured by the first current sensor and the magnitude of the current measured by the second current sensor. The wiring device according to claim 5.

8. Further provided with a first current sensor housed in the housing for measuring the magnitude of the current output from the power supply to the first switch. The fourth terminal is electrically connected to a charger capable of charging a battery. The controller obtains charging current information regarding the magnitude of the current output from the charger to the battery from the charger. The controller restricts the magnitude of the power output from the first switch to the second switch according to the magnitude of the current measured by the first current sensor and the charging current information obtained from the charger. The wiring device according to claim 5.

9. The controller has an input unit for obtaining information regarding the magnitude of the current output from the power supply to the first switch from a smart meter. The controller restricts the magnitude of the power output from the first switch to the second switch according to the magnitude of the current measured by the smart meter. The wiring device according to claim 5.

10. Further provided with a terminal block having a fifth terminal electrically connected to the second terminal and a sixth terminal electrically connected to the fifth terminal. The terminal block is housed in the housing. The controller restricts the magnitude of the power output from the first switch to the second switch according to at least one of the magnitude of the power output from the power supply to the first switch and the magnitude of the power output from the first switch to the terminal block. The wiring device according to claim 1.

11. The controller is electrically connected to the second terminal and operates using the power supplied from the second terminal. The wiring device according to claim 1.

12. A first wiring extending from a measuring instrument for measuring power or current. A second wiring joined to the first wiring. A protection part covering a joining part where the first wiring and the second wiring are joined. A protection device.

13. The first wiring has a first core wire and a first coating surrounding the first core wire. The second wiring has a second core wire and a second coating surrounding the second core wire. At the joint, the first core wire and the second core wire are joined together. The protection part includes a tape wound around the joint. The protection device according to claim 12.

14. The protection part includes a protection housing covering the joint. The protection device according to claim 12.

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