JP7336668B2 - Power repeater, power supply system and distribution system - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to power relay devices, power supply systems, and power distribution systems. More specifically, the present disclosure provides a power relay device that relays one outlet of a plurality of outlets that output power supplied from a power system and an output unit of a distributed power supply, and a power supply that includes the power relay device. The present invention relates to a system and a power distribution system including the power relay device.

As means for supplying electric power to a grid power distribution system of a building in the event of a power outage, a manual power switching device for residential use described in Patent Literature 1 is known. This manual power source switching device for residential use has a switching switch for switching between a normal power source and an emergency power source. Normally, the switching switch is manually connected to the utility power supply side, and the power from the utility power supply is output to the building's power distribution system. In an emergency, the diverter switch is manually connected to the emergency power supply so that power from the emergency power supply is output to the building's distribution system.

Utility Model Registration No. 3113914

In the manual power switching device for residential use described in Patent Document 1, when installing the manual power switching device for residential use in a building, it is necessary to perform large-scale electrical work on the distribution board or the like installed in the building. Yes, and it costs a lot. In addition, when outputting power from an emergency power supply (distributed power supply) to the grid power distribution system of a building, it is necessary to prevent reverse flow of power from the emergency power supply to the regular power supply (power system).

An object of the present disclosure is to provide a power relay device, a power supply system, and a power distribution system capable of supplying power from a distributed power supply to a building's grid power distribution system with an inexpensive configuration and preventing reverse power flow to the power system. do.

A power relay device according to one aspect of the present disclosure relays one outlet out of a plurality of outlets that output power supplied from a power system via a first switch and an output unit of a distributed power supply. The first switch connects and disconnects an electric circuit between the electric power system and the plurality of outlets according to a closed state and an open state. The power relay device includes an open/close detection unit and a power supply control unit. The open/close detector detects whether or not the first switch is in an open state. The power supply control unit outputs power from the output unit of the distributed power source to the one outlet when the open/close detection unit detects that the first switch is in an open state.

A power supply system according to one aspect of the present disclosure includes the power relay device and the distributed power supply.

A power distribution system according to one aspect of the present disclosure includes the power relay device and a grid power distribution system. The grid distribution system distributes power supplied from the power grid via the first switch to the plurality of outlets, and the first switch connects to the power grid according to a closed state and an open state. It connects and disconnects the electric circuit between the plurality of outlets.

INDUSTRIAL APPLICABILITY The present disclosure can provide an effect of being able to supply power from a distributed power source to a building's power distribution system with an inexpensive configuration and prevention of reverse power flow to the power system.

FIG. 1 is a block diagram of each of a power relay device, a grid distribution system, and distributed power sources according to an embodiment. FIG. 2 is an explanatory diagram for explaining the operation of the continuity detection section of the power relay device of the same. FIG. 3 is an explanatory diagram for explaining the operation of the pseudo earth leakage circuit of the power relay device of the same. FIG. 4A is a partially see-through side view of the output plug of the power relay device; FIG. 4B is a front view of the contact surface of the output plug of the same; FIG. 5 is a flowchart for explaining the operation of the power relay device of the same. FIG. 6 is a block diagram of each of the power relay device and the system power distribution system according to Modification 2. As shown in FIG. FIG. 7 is a block diagram of a power relay device according to modified examples 3 and 4. In FIG.

(embodiment)
A power relay device 1 according to the present embodiment will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIG. 1 , the power relay device 1 relays an outlet 3 a of a plurality of outlets 3 that output power from the power system 2 and an output unit 4 a of the distributed power supply 4 . As a result, the power from the distributed power supply 4 is supplied to the other outlet 3b of the plurality of outlets 3 . As a result, even if the power supply from the power system 2 is stopped due to a disaster such as an earthquake or typhoon, the distributed power supply 4 can supply power to the electrical equipment 5 connected to the other outlet 3b. The power relay device 1 will be described in detail below.

First, before describing the power relay device 1 in detail, the system power distribution system 10 installed in the building will be described. The grid power distribution system 10 is a system that distributes power from the power grid 2 to a plurality of outlets 3 installed in a building.

The grid distribution system 10 receives power from the power grid 2 via the pole transformer 6 . More specifically, the power from the power system 2 is high-voltage (eg, 6600 V) single-phase two-wire AC power. The power system 2 and the pole transformer 6 are connected by two electric lines. Electric power from the power system 2 is transmitted from the power system 2 to the pole transformer 6 through two electric lines. The pole transformer 6 steps down the power from the electric power system 2 to single-phase three-wire AC power of a predetermined voltage (for example, 100 V or 200 V). The pole transformer 6 and the system distribution system 10 are connected by three electric lines. The electric power stepped down by the pole transformer 6 is transmitted from the pole transformer 6 to the grid power distribution system 10 through three electric lines.

The pole transformer 6 has a primary coil 61 and a secondary coil 62 wound around an iron core. Two electric lines from the electric power system 2 are connected to both ends of the primary coil 61 . Three electrical lines from grid power distribution system 10 are connected to the ends and center of secondary coil 62, respectively. The three electric circuits are an L1 phase electric circuit, an L2 phase electric circuit, and an N phase electric circuit, respectively. The N-phase electric circuit is connected to the center of the secondary coil 62 . In the N-phase electric circuit, the branch point B1 of the N-phase electric circuit is grounded at the ground point A1. The electrical resistance at the ground point A1 is, for example, 10Ω or less. The L1-phase electric circuit and the L2-phase electric circuit are connected to both ends of the secondary coil 62, respectively. A voltage of 100 V is applied to each of the L1-phase electric circuit and the L2-phase electric circuit with reference to the N-phase electric circuit.

The system distribution system 10 includes a main electric line 11 , a plurality of branch lines 12 , a distribution board 13 , a plurality of outlets 3 , and a smart meter 14 .

The main electric line 11 is an electric line that connects the pole transformer 6 and the system power distribution system 10 and is drawn into the system power distribution system 10 . The main electric circuit 11 is composed of the three electric circuits (the L1-phase electric circuit, the L2-phase electric circuit, and the N-phase electric circuit).

The plurality of branch electrical paths 12 are electrical paths branched from a plurality of branch points on the main electrical path 11 and are electrical paths that connect the main electrical path 11 and the plurality of outlets 3 . Each of the plurality of branch electric lines 12 is composed of two electric lines. The plurality of outlets 3 includes an outlet 3 on the L1 side and an outlet 3 on the L2 side. The outlet 3 on the L1 side is connected to the L1-phase electric line and the N-phase electric line of the main electric line 11 by two electric lines of the branch electric lines 12 . The outlet 3 on the L2 side is connected to the L2-phase electric line and the N-phase electric line of the main electric line 11 by two electric lines of the branch electric lines 12 .

The distribution board 13 is a device that distributes power transmitted from the pole transformer 6 through the main electric line 11 to a plurality of outlets 3 . The distribution board 13 includes a branch circuit 131 , a main breaker 132 , a plurality of branch breakers 133 and a plurality of ground terminals 134 .

The branch circuit 131 is a circuit that distributes power transmitted through the main electric line 11 to a plurality of outlets 3 . The branch circuit 131 is composed of a main electric line 11 (more specifically, a portion of the main electric line 11 drawn into the distribution board 13 ) and a plurality of branch electric lines 12 .

The master breaker 132 (first switch, system side switch) is provided upstream of a plurality of branch points in the main electric line 11 . The main breaker 132 is provided downstream of the pole transformer 6 in the main electric line 11 . In this embodiment, the master breaker 132 is provided in the main electric line 11 , but may be provided in any position as long as it is an electric line between the electric power system 2 and the plurality of outlets 3 . The main breaker 132 is switched to an open state or a closed state depending on whether the amount of current flowing through the main electric line 11 exceeds a specified value. Then, the master breaker 132 conducts and interrupts the main electric circuit 11 (the electric circuit between the electric power system 2 and the plurality of outlets 3) according to the closed state and the open state. The master breaker 132 collectively conducts and interrupts power transmitted to the plurality of outlets 3 .

It should be noted that the fact that the main breaker 132 cuts off the main electric circuit 11 means that all the three electric circuits that make up the main electric circuit 11 are cut off, and that the main breaker 132 turns on the main electric circuit 11 constitutes the main electric circuit 11. It is to conduct all three electric circuits.

The main breaker 132 has an earth leakage detection circuit 132a. The leakage detection circuit 132a detects whether or not the current flowing through the main electric line 11 via the main breaker 132 (that is, the current supplied from the electric power system 2 to the plurality of outlets 3) is leaking. When the leakage detection circuit 132a detects no leakage, the leakage detection circuit 132a keeps the main breaker 132 closed to keep the main electric line 11 conductive. In addition, when the leakage detection circuit 132a detects an electrical leakage, the leakage detection circuit 132a switches the main breaker 132 from the closed state to the open state to cut off the main electric line 11. FIG. The master breaker 132 can be manually switched to an open state or a closed state. Therefore, when the main breaker 132 is switched from the closed state to the open state, the main electric circuit 11 can be made conductive by manually switching the main breaker 132 from the open state to the closed state.

The leakage detection circuit 132a operates (that is, starts) using the voltage from the electric power system 2 supplied through the main electric line 11 as the operating voltage. In this embodiment, the leakage detection circuit 132a operates using the voltage between the L1-phase electric circuit and the L2-phase electric circuit of the main electric circuit 11 (that is, 200 V) as the operating voltage. Therefore, in this embodiment, as will be described later, the output voltage (100 V) of the distributed power supply 4 and the applied voltage (for example, 100 V) at the time of conduction detection of the power relay device 1 are insufficient for operating voltage. Circuit 132a does not operate.

The plurality of branch breakers 133 correspond to the plurality of branch electric lines 12 on a one-to-one basis, and are provided in the corresponding branch electric lines 12 . The plurality of branch breakers 133 are switched to an open state or a closed state depending on whether or not the current amount of the current flowing through the corresponding branch circuit 12 satisfies a predetermined condition, and the branch circuit breaker corresponding to the closed state and the open state switches to the corresponding branch circuit. 12 is turned on and off. The above predetermined condition is, for example, a condition that a current of a predetermined value (eg, 20 A) flows through the branch line 12 for a predetermined time (eg, 1 hour). The plurality of branch breakers 133 individually conduct and interrupt power transmitted to the plurality of outlets 3 for each outlet 3 . It should be noted that the fact that the branch breaker 133 cuts off the branch electric circuit 12 means that all the two electric circuits that constitute the branch electric circuit 12 are cut off. It is to conduct all two electric circuits.

The plurality of ground terminals 134 are terminals used when grounding the later-described E-phase pole (ground pole) of each outlet 3 . Each of the plurality of ground terminals 134 is grounded to the ground point A2. The electrical resistance at the ground point A2 is, for example, 100Ω or less. The E-phase pole of each outlet 3 is connected to the ground terminal 134 via an electric circuit. The E-phase pole of each outlet 3 is grounded to ground point A2 by being connected to ground terminal 134 .

The smart meter 14 is provided between the pole transformer 6 and the distribution board 13 in the main electric line 11 . The smart meter 14 measures the power transmitted from the pole transformer 6 to the distribution board 13 (that is, the power consumed by the electrical equipment 5 in the building). The measurement results of the smart meter 14 can be transmitted to, for example, an electric power company.

A plurality of outlets 3 are installed inside or outside the building. The plurality of outlets 3 are receptacles into which the power plugs of the electrical equipment 5 are inserted, and supply power to the electrical equipment 5 via the inserted power plugs. The electric appliances 5 are, for example, lighting fixtures, refrigerators, televisions, and the like.

At least one outlet 3 among the plurality of outlets 3 is a three-pole outlet. A 3-prong outlet is an outlet having 3 prongs. A 3-pole individual hole is a 3-pole plug having 3 insertion holes corresponding to 3 blades (L-phase pole, N-phase pole, and E-phase pole (ground pole)) of a 3-pole plug. The 3-pole outlet may further have a 2-pole individual outlet. A two-pole plug is a plug having only two receptacles corresponding to two blades (an L-phase pole and an N-phase pole) of a two-pole plug. In this embodiment, among the plurality of outlets 3, the outlet 3a is a three-pole outlet, and the remaining outlets 3b and 3c are two-pole outlets. A dipole outlet is an outlet that has only two poles. Note that all of the plurality of outlets 3 may be three-pole outlets.

In this embodiment, for example, all the outlets 3c on the L1 side are two-pole outlets. Out of the outlets 3 on the L2 side, only the outlet 3a is a three-pole outlet, and the remaining outlets 3b are two-pole outlets. The L-phase and N-phase poles of the two-pole outlet 3c on the L1 side are connected to the L1-phase and N-phase electric lines of the main electric line 11 via the two electric lines of the branch electric lines 12, respectively. Of the three poles of the three-pole outlet 3a on the L2 side, the L-phase pole and the N-phase pole are respectively connected to the L2-phase electric line and the N-phase electric line of the main electric line 11 via the two electric lines of the branch electric line 12, The E-phase pole is connected to the ground terminal 134 via the electric line 16 . The L-phase and N-phase poles of the two-pole outlet 3b on the L2 side are connected to the L2-phase and N-phase electric lines of the main electric line 11 via the two electric lines of the branch electric lines 12, respectively.

The plurality of outlets 3 includes indoor outlets and outdoor outlets. An outdoor outlet is an outlet installed outdoors (for example, an outer wall) of a building, and in this embodiment, the three-pole outlet 3a is the outdoor outlet. The indoor outlets are outlets installed inside the building, and in this embodiment, the outlets 3b and 3c are indoor outlets. All of the plurality of outlets 3 may be indoor outlets or outdoor outlets.

In this grid distribution system 10, the power (eg, 6600 V) from the power grid 2 is stepped down to a predetermined power (eg, 100 V/200 V, 15 A) by the pole transformer 6, and then transmitted to the distribution board 13 through the main electric line 11. be done. The power transmitted to the distribution board 13 is distributed to the plurality of outlets 3 through the plurality of branch lines 12 after passing through the main breaker 132 . Each outlet 3 can output power of a predetermined standard (for example, 100 V, 15 A). The power transmitted to each outlet 3 is supplied to the electrical equipment 5 connected to the outlet 3 . A leakage detection circuit 132 a of the main breaker 132 operates using the voltage applied to the main electric line 11 as an operating power source, and detects leakage of current flowing through the main electric line 11 . When the leakage detection circuit 132a detects the leakage, it switches the main breaker 132 from the closed state to the open state to cut off the main electric line 11. FIG. This interruption stops the supply of power from the power system 2 to the plurality of outlets 3 . By manually switching the main breaker 132 from the open state to the closed state, it is possible to restart the supply of power from the power system 2 to the plurality of outlets 3 .

In this embodiment, the power relay device 1 and the distributed power sources 4 constitute a power supply system that supplies power to the grid power distribution system 10 installed in the building. Also, the power relay device 1 and the grid power distribution system 10 constitute a power distribution system that supplies power to a plurality of outlets 3 installed in the building.

Next, the distributed power source 4 will be described in detail with reference to FIG.

The distributed power source 4 is a power source that outputs AC power and is a power source other than the power system 2 . The distributed power source 4 is, for example, a standby power source for the power system 2 . The standby power supply is a power supply that supplies AC power instead of the power system 2 when the power system 2 cannot be used. Distributed power sources 4 are, for example, generators or solar power generators. The generator is a generator that uses gasoline, LP gas, or the like as fuel. Moreover, the distributed power supply 4 may be a power supply output unit (for example, an AC 100V outlet) provided in a hybrid vehicle, an electric vehicle, or the like. The distributed power source 4 has an output section 4a that outputs electric power. The output section 4a is a female type (that is, a structure having a receptacle into which a plug is inserted) output section. The output section 4a is a three-pole output section having a three-pole individual opening.

Next, the power relay device 1 will be described in detail with reference to FIG.

First, main features (features 1 to 3) of the power relay device 1 will be described.

The power relay device 1 outputs power from the distributed power sources 4 to one outlet 3 by relaying the output unit 4 a of the distributed power sources 4 and one outlet 3 out of the plurality of outlets 3 . As one outlet 3 to be relayed, a three-pole outlet 3 including an E-phase pole (ground pole) is selected for the purpose of controlling opening/closing of the main breaker 132 by the power relay device 1 as described later. In this embodiment, the outdoor outlet 3a is selected as the one outlet 3 .

In the following description, one relayed outlet 3a is also referred to as a relay outlet 3a. Also, the time when the power relay device 1 is connected to the output unit 4a of the distributed power source 4 and the relay outlet 3a is simply referred to as "when the power relay device 1 is connected". Also, the state in which the power relay device 1 relays between the output unit 4a of the distributed power source 4 and the relay outlet 3a is also simply referred to as the "relay state of the power relay device 1".

(Feature 1)
The power relay device 1 outputs power from the distributed power source 4 to the relay outlet 3a only when the master breaker 132 is open when the power relay device 1 is connected and in the relay state. As a result, even if the master breaker 132 is closed when the power relay device 1 is connected, or even if the master breaker 132 is manually switched from the open state to the closed state while the power relay device 1 is in the relay state, distributed It is possible to prevent the power from the power source 4 from flowing backward to the power system 2 .

(Feature 2)
When the main breaker 132 is closed when the power relay device 1 is connected and in the relay state, the power relay device 1 forcibly controls the main breaker 132 to open from the closed state. As a result, even if the master breaker 132 is closed when the power relay device 1 is connected, or even if the master breaker 132 is manually switched from the open state to the closed state while the power relay device 1 is in the relay state, distributed It is possible to prevent the power from the power source 4 from flowing backward to the power system 2 .

(Feature 3)
The power relay device 1 has two male plugs (input plug 20 and output plug 21) as described later. The power relay device 1 prohibits the output voltage of the distributed power source 4 from being output from the output plug 21 when the input plug 20 is connected to the output section 4a of the distributed power source 4 and the output plug 21 is not connected to the relay outlet 3a. do. This prevents the blade of the output plug 21 from being exposed while the output voltage of the distributed power supply 4 is being applied.

Next, the configuration of the power relay device 1 will be described in detail with reference to FIG.

The power relay device 1 includes two plugs (an input plug 20 and an output plug 21) and a device main body 22.

The input plug 20 is connected to the output section 4a of the distributed power source 4 and receives the power output from the distributed power source 4 . The output plug 21 is connected to one outlet (relay outlet) 3a of the plurality of outlets 3, and outputs power from the distributed power supply 4 input to the input plug 20 to the relay outlet 3a. Each of the two plugs 20 and 21 is a male plug and a three-prong plug. A three-pole plug is a plug that has three blades (L-phase pole, N-phase pole and E-phase pole). The three poles of the input plug 20 are connected to the three poles of the outlet 3 so that the same phase poles are connected to each other. The three poles of the output plug 21 are connected to the three poles of the output section 4a of the distributed power supply 4 so that the same phase poles are connected to each other. Each of the two plugs 20 and 21 is connected to the device main body 22 via wiring. By connecting the input plug 20 to the relay outlet 3a and connecting the output plug 21 to the output section 4a of the distributed power supply 4, the power relay device 1 relays the relay outlet 3a and the output section 4a of the distributed power supply 4. .

The device main body 22 outputs power from the distributed power source 4 input to the input plug 20 to the relay outlet 3 a connected to the output plug 21 . The device main body 22 includes a main electric circuit 23, an electromagnetic switch 24, a continuity detection unit 25, a pseudo earth leakage circuit 26, a connection detection unit 27, and two voltage detection units (a first voltage detection unit 28 and a second voltage detection unit 28). It includes a detection unit 29 ), a power supply unit 30 , a display unit, and a control unit 32 .

The main electric line 23 is an electric line for transmitting electric power input to the input plug 20 to the output plug 21 . The main electric circuit 23 is composed of three electric circuits (an L-phase electric circuit, an N-phase electric circuit, and an E-phase electric circuit). The L-phase, N-phase and E-phase circuits electrically connect the L-phase poles, the N-phase poles and the E-phase poles of the two plugs, respectively. A portion of the main electric line 23 that is drawn out of the device main body 22 and connected to the plugs 20 and 21 constitutes the above-described wiring that connects the plugs and the device main body.

The electromagnetic switch 24 (second switch, relay side switch) can be switched between a closed state and an open state, and conducts and interrupts the main electric line 23 according to the closed state and the open state. By this conduction and interruption, power transmission from the input plug 20 to the output plug 21 and power transmission stop are performed. More specifically, the electromagnetic switch 24 individually conducts and cuts off two electric circuits (L-phase electric circuit and N-phase electric circuit) among the three electric circuits constituting the main electric circuit 23 according to the closed state and the open state. do.

The continuity detection unit 25 (open/close detection unit) detects the continuity of the main breaker 132 (in other words, the main breaker 11) based on the continuity state of the electric line passing through the main breaker 132 (in other words, the electric line including the main electric line 11) when the power relay device 1 is connected and in the relay state. 132 is open. More specifically, when the power relay device 1 is connected and in the relaying state, the continuity detection unit 25 detects the current between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 23 between the output plug 21 and the electromagnetic switch 24 . Based on the impedance, the conduction state of the electric circuit is detected. In the present embodiment, detecting the impedance between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 23 means that the impedance between the N-phase pole and the E-phase pole among the three poles of the output plug 21 is detected. Further, it is the same as detecting the impedance between the N-phase pole and the E-phase pole of the three poles of the relay receptacle 3a.

The pseudo-leakage circuit 26 makes the current flowing through the main electric circuit 23 of the power relay device 1 pseudo-leakage when the main breaker 132 is closed in the relay state of the power relay device 1 . As a result, the electric current flowing through the main electric line 11 (the electric line passing through the main breaker 132) of the distribution board 13 is caused to be a pseudo electric leakage. The pseudo earth leakage circuit 26 causes the earth leakage detection circuit 132a of the main breaker 132 to detect the above pseudo earth leakage, thereby forcibly controlling the main breaker 132 from the closed state to the open state.

The pseudo earth leakage circuit 26 short-circuits the L-phase circuit and the N-phase circuit of the main circuit 23 between the output plug 21 and the electromagnetic switch 24 in the relay state of the power relay device 1, so that the main circuit 23 flows. Create a pseudo-leakage in the current. The pseudo earth leakage circuit 26 has a relay 26a and a resistor 26b. The relay 26a and the resistor 26b are connected between the L-phase electric line and the N-phase electric line of the main electric line 23 while being connected in series with each other. The L-phase electric circuit and the N-phase electric circuit are turned on and off according to the closed state and the open state of the relay 26a, and the electric conduction short-circuits the L-phase electric circuit and the N-phase electric circuit.

The connection detector 27 is provided in the output plug 21 and detects whether or not the output plug 21 is connected to the relay outlet 3a. The connection detection unit 27 outputs a connection signal or a disconnection signal to the control unit 32 depending on whether the output plug 21 is connected to the relay outlet 3a. The connection signal is a signal indicating that the output plug 21 is connected to the relay outlet 3a, and the non-connection signal is a signal indicating that the output plug 21 is not connected to the relay outlet 3a.

The first voltage detection unit 28 detects whether or not the voltage output from the relay outlet 3a to the output plug 21 exceeds a predetermined voltage (for example, 0 V) when the electromagnetic switch 24 is open in the relay state of the power relay device 1. To detect. More specifically, the first voltage detection unit 28 determines whether the voltage between the L-phase electric circuit and the N-phase electric circuit of the main electric circuit 23 between the electromagnetic switch 24 and the output plug 21 is equal to or higher than a predetermined voltage. to detect This makes it possible to detect whether the power system 2 is in a power outage or has a double power supply. That is, when the voltage detected by the first voltage detection unit 28 is equal to or lower than the predetermined voltage, it is determined that the power system 2 is in a power outage. is judged to be double-charged.

The second voltage detection unit 29 detects whether or not the voltage input to the input plug 20 (that is, the output voltage of the distributed power supply 4) exceeds a specified voltage (eg, the rated voltage of the outlet 3, eg, 100 V). More specifically, the second voltage detection unit 29 detects the L-phase electric circuit of the main electric circuit 23 between the electromagnetic switch 24 and the input plug 20 in the open state of the electromagnetic switch 24 in the relay state of the power relay device 1 . It detects whether or not the voltage between the E-phase electric circuit exceeds a specified voltage.

When the voltage detected by the second voltage detection unit 29 exceeds the specified voltage, the electromagnetic switch 24 is switched from the closed state to the open state, and transmission of the output of the distributed power supply 4 to the output plug 21 is prohibited. may be

Note that, in the present embodiment, each detection unit (the continuity detection unit 25, the connection detection unit 27, the first voltage detection unit 28, and the second voltage detection unit 29) is in the relay state of the power relay device 1, and the above-described voltages are detected at regular intervals. detection. By setting the constant interval to a relatively short interval (for example, 1 second), each detecting unit can substantially perform the above detection promptly when the power relay device 1 is connected.

The power supply unit 30 functions as a power supply for the power relay device 1 . The power supply unit 30 steps down the output voltage of the distributed power supply 4 input to the input plug 20 to a predetermined voltage and uses it as the operating voltage of the power relay device 1 .

The display unit 31 displays various information about the power relay device 1 (for example, detection results of the continuity detection unit 25, the connection detection unit 27, the first voltage detection unit 28, and the second voltage detection unit 29). The display unit 31 is composed of a liquid crystal display or the like.

The control unit 32 (interruption control unit and power supply control unit) detects an electromagnetic It controls the switch 24 and the pseudo earth leakage circuit 26 .

More specifically, when the continuity detection unit 25 detects that the main breaker 132 is closed when the power relay device 1 is connected or in the relay state, the control unit 32 moves the electromagnetic switch 24 from the closed state. Control to open. As a result, the main electric line 23 of the power relay device 1 is cut off. Therefore, the power from the distributed power sources 4 is prohibited from being output to the relay outlet 3a through the power relay device 1. FIG. As a result, reverse flow of power from the distributed power source 4 to the power system 2 is prevented. In this way, the control unit 32 controls the opening and closing of the electromagnetic switch 24, thereby controlling the output (transmission) of electric power from the distributed power supply 4 to the relay outlet 3a.

Further, when the continuity detection unit 25 detects that the main breaker 132 is open when the power relay device 1 is connected or in the relay state, the control unit 32 changes the electromagnetic switch 24 from the open state to the closed state. to control. As a result, the main electric line 23 of the power relay device 1 becomes conductive, and the power from the distributed power supply 4 is output to the relay outlet 3a through the main electric line 23. FIG. In this manner, with the main breaker 132 open, the control unit 32 causes the power from the distributed power supply 4 to be output to the relay outlet 3a. As a result, the electric power from the distributed power supply 4 is supplied from the relay outlet 3a to the other outlet 3b through the electric circuit in the distribution board 13. FIG.

Further, when the continuity detection unit 25 detects that the main breaker 132 is closed when the power relay device 1 is connected or in the relay state, the control unit 32 activates the pseudo earth leakage circuit 26 (that is, the relay 26a from the open state to the closed state). As a result, a pseudo electric leakage occurs in the current flowing through the main electric line 11 of the distribution board 13 . When the electric leakage detection circuit 132a of the main breaker 132 detects the pseudo electric leakage, the main breaker 132 automatically switches from the closed state to the open state. That is, the control unit 32 activates the pseudo-earth leakage circuit 26 to generate a pseudo-earth leakage, and causes the leakage detection circuit 132a to detect the pseudo-earth leakage, thereby forcibly closing the main breaker 132 from the open state. controlling.

Further, when the continuity detection unit 25 detects that the main breaker 132 is open when the power relay device 1 is connected or in the relay state, the control unit 32 stops the pseudo earth leakage circuit 26 (that is, the relay 26a in the open state). As a result, the occurrence of pseudo leakage in the current flowing through the main electric line 11 of the distribution board 13 is prohibited.

More specifically, when the continuity detection unit 25 detects that the master breaker 132 is open when the power relay device 1 is connected or in the relay state, the control unit 32 causes the first voltage detection unit 28 to detect When the voltage exceeds a predetermined voltage (for example, 0 V), control is performed to activate the pseudo earth leakage circuit 26, and when the voltage detected by the first voltage detector 28 is equal to or lower than the predetermined voltage, the pseudo earth leakage circuit 26 is stopped. to control.

In addition, when the voltage detected by the second voltage detection unit 29 exceeds a specified voltage (for example, the rated voltage of the outlet 3, for example, 100 V) when the power relay device 1 is connected or in the relay state, the control unit 32 detects, for example, an electromagnetic The switch 24 is controlled to open from the closed state. This prohibits power exceeding the specified voltage from being output from the distributed power supply 4 to the relay outlet 3a through the power relay device 1. FIG. Further, when the voltage detected by the second voltage detection unit 29 is equal to or lower than the specified voltage when the power relay device 1 is connected or in the relay state, the control unit 32 changes the electromagnetic switch 24 from the open state to the closed state. to control. As a result, power that does not exceed the specified voltage is output from the distributed power source 4 to the relay outlet 3a through the power relay device 1. FIG.

Next, the above feature 1 of the power relay device 1 will be described in detail with reference to FIG.

In feature 1, the power relay device 1 outputs power from the distributed power sources 4 to the relay outlet 3a only when the main breaker 132 is open when the power relay device 1 is connected and in the relay state.

More specifically, when the power relay device 1 is connected or in the relay state, the continuity detection unit 25 detects that the impedance between the N-phase circuit and the E-phase circuit of the main circuit 23 of the power relay device 1 is a predetermined value (for example, 200Ω). ) to detect whether or not Thereby, the continuity detection unit 25 detects whether or not the path T1 shown in FIG. 2 is closed, and determines (detects) whether or not the main breaker 132 is in the open state according to the detection result.

The path T1 includes, in order from the continuity detection unit 25, the branch point B2 of the N-phase electric line of the main electric line 23, the N-phase pole of the output plug 21, the N-phase pole of the relay outlet 3a, and the branch point B3 of the N-phase electric line of the main electric line 11. , the N-phase side relay of the main breaker 132, the branch point B1 of the N-phase electric circuit, the grounding point A1, the grounding point A2, the ground terminal 134, the electric circuit 16, the E-phase pole of the relay outlet 3a, the E-phase pole of the output plug 21, and , the branch point B4 of the E-phase electric circuit of the main electric circuit 23 and returns to the continuity detection unit 25. FIG.

When the path T1 is conductive, the impedance detected by the continuity detection unit 25 is approximately the sum of the ground resistances at the two ground points A1 and A2 (eg, 110Ω). On the other hand, when the path T1 is not conducting, the impedance detected by the continuity detecting section 25 becomes infinite. Therefore, when the impedance detected by the continuity detection unit 25 is equal to or less than a predetermined value (for example, 200Ω), the continuity detection unit 25 determines that the path T1 is conductive (that is, the main breaker 132 is closed). do. Further, when the impedance detected by the continuity detection unit 25 exceeds a predetermined value, the continuity detection unit 25 determines that the path T1 is not conductive (that is, the main breaker 132 is open).

More specifically, the continuity detection unit 25 applies a predetermined voltage (a voltage of about several volts) between the N-phase electric line and the E-phase electric line of the main electric line 23 of the power relay device 1 . Then, the continuity detection unit 25 detects the current flowing between the N-phase electric circuit and the E-phase electric circuit at the time of the application. Based on the detected current, the continuity detection unit 25 determines whether the impedance between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 23 is equal to or less than a predetermined value (that is, whether the electric circuits 11 and 23 via the main breaker 132 is conductive) or not. At the time of this detection, the electromagnetic switch 24 is desirably controlled to be in the open state by the control section 32 .

The leakage detection circuit 132 a of the master breaker 132 is activated by the voltage (200 V) between the L1 phase circuit and the L2 phase circuit of the main circuit 11 in the distribution board 13 . Therefore, the leakage detection circuit 132a is not activated by the voltage application at the time of detection by the continuity detection unit 25 and the output voltage of the distributed power supply 4. FIG.

Further, detection by the continuity detection unit 25 is repeatedly performed at relatively short regular intervals (for example, intervals of 1 second), so that when the main breaker 132 is manually switched from the open state to the closed state, A closed state can be detected.

When the master breaker 132 is closed, if the electromagnetic switch 24 is closed, there is a possibility that the power from the distributed power supply 4 will flow backward to the power system 2 . Therefore, in this case, the electromagnetic switch 24 is kept open by the controller 32 . As a result, the electrical connection between the output section 4a of the distributed power supply 4 and the relay outlet 3a is cut off. On the other hand, when the main breaker 132 is open, there is no possibility that the power from the distributed power supply 4 will flow backward to the power system 2 even if the electromagnetic switch 24 is closed. Therefore, in this case, the electromagnetic switch 24 is controlled by the controller 32 so as to change from the open state to the closed state. As a result, the output section 4a of the distributed power supply 4 and the relay outlet 3a are electrically connected.

Next, the above feature 2 of the power relay device 1 will be described in detail with reference to FIG.

In feature 2, when the power relay device 1 is connected and in the relay state and the main breaker 132 is closed, the power relay device 1 controls the main breaker 132 to forcibly open from the closed state. .

For example, when the master breaker 132 is manually switched from the open state to the closed state while power is being supplied to the power system 2 (including after the power is restored), the earth leakage detection circuit 132a of the master breaker 132 is activated. In this case, the pseudo earth leakage circuit 26 of the power relay device 1 causes the current flowing through the path T2 shown in FIG. When the earth leakage detection circuit 132a detects a pseudo earth leakage, the main breaker 132 automatically switches from the closed state to the open state. In this way, when the earth leakage detection circuit 132a is activated, the power relay device 1 causes the pseudo earth leakage circuit 26 to generate a pseudo earth leakage and causes the earth leakage detection circuit 132a to detect the pseudo earth leakage, thereby turning off the main breaker 132. Control to forcibly change from the closed state to the open state.

The route T2 is, in order from the lower end B5 of the secondary coil of the pole transformer 6, the branch point B6 of the L2-phase electric line of the main electric line 11, the L-side electric line of the branch electric line 12 connected to the branch point B6, and the relay outlet. L-phase pole of 3a, branch point B7 of L-phase electric line of main electric line 23 of output plug 21, resistor 26b, relay 26a, branch point B8 of E-phase electric line of main electric line 23, E-phase pole of output plug 21, relay socket 3a, the electric circuit 16, the ground terminal 134, the grounding point A2, the grounding point A1, the branch point B1 of the N-phase electric circuit of the main electric circuit 11, the center point of the secondary coil 62, and the lower end B5 of the secondary coil 62. It is the route to reach.

More specifically, in the present embodiment, the continuity detection unit 25 detects that the main breaker 132 is closed when the power relay device 1 is connected and in the relay state. Then, according to the detection result, the control unit 32 controls to activate the pseudo earth leakage circuit 26 (that is, to change the relay 26a from the open state to the closed state).

In this embodiment, the pseudo earth leakage circuit 26 is activated (operated) according to the detection result of the continuity detection section 25, as described above. However, the pseudo earth leakage circuit 26 may be operated all the time regardless of the detection result of the continuity detection section 25 . That is, the relay 26a may be kept closed at all times. In this case, when the master breaker 132 is switched from the open state to the closed state while the power relay device 1 is in the relay state (that is, the electromagnetic switch 24 is in the closed state) and power is being supplied to the power system 2 (including after power is supplied). , power supply from the power system 2 and power supply from the distributed power supply 4 are temporarily performed in parallel. However, when the leakage detection circuit 132a detects the pseudo leakage caused by the pseudo leakage circuit 26, the main breaker 132 is quickly switched from the closed state to the open state, and the power supply from the power system 2 is cut off.

In the above case (that is, when the relay 26a is kept closed and the electromagnetic switch 24 is closed), the potential of the E-phase circuit of the main circuit 23 of the power relay device 1 may rise. Therefore, it is desirable to set the value of the resistor 26b so that the potential of the E-phase electric circuit does not exceed the specified potential.

The relay 26a of the pseudo earth leakage circuit 26 is desirably controlled to be open when the electromagnetic switch 24 is open.

Next, the above feature 3 of the power relay device 1 will be described in detail with reference to FIGS. 4A and 4B.

As shown in FIG. 4A, the output plug 21 of the power relay device 1 includes a plug body 211, three blades 212 to 214, and a connection detector 27. As shown in FIG. The connection detector 27 includes a projection 271 and a switch 272 .

The three blades 212 to 214 are an L-phase pole blade 212, an N-phase pole blade 213, and an E-phase blade 214, respectively. The plug body 211 is a member that holds three blades 212-214. The plug body 211 has a contact surface 211a. The contact surface 211a is a flat surface that contacts the surface of the relay outlet 3a when the output plug 21 and the relay outlet 3a are connected. The contact surface 211a has a hole in which the protrusion 271 can be accommodated. The three blades 212 to 214 protrude from the contact surface 211a in the direction normal to the contact surface 211a.

The protrusion 271 is provided on the plug body 211 so as to be able to protrude from the hole of the contact surface 211a and to be housed inside the hole. The protrusion 271 is biased by an elastic member so as to protrude from the hole of the contact surface 211a. The elastic member is housed inside the hole. The projecting portion 271 can be pushed into the hole by an external force against the biasing force of the elastic member (that is, can be accommodated inside the hole). The projecting portion 271 is provided, for example, on the peripheral portion of the contact surface 211a.

The switch 272 is provided inside the plug body 211 . The switch 272 is switched on or off according to the protruded state and the housed state of the protrusion 271 . The switch 272 switches from ON to OFF to output an OFF signal to the control unit 32 when the protrusion 271 is in the projected state, and switches from OFF to ON to output an ON signal when the protrusion 271 is in the retracted state. is output to the control unit 32 .

In this output plug 21, when the output plug 21 is not connected to the relay outlet 3a, the protrusion 271 protrudes from the contact surface 211a. In this projecting state, the switch 272 switches from on to off and outputs an off signal to the control section 32 . In this embodiment, the OFF signal is a signal (non-contact signal) indicating that the output plug 21 is not connected to the relay outlet 3a. On the other hand, when the output plug 21 is connected to the relay outlet 3a, the tip of the protrusion 271 contacts the relay outlet 3a and is pushed into the hole by the relay outlet 3a and accommodated. there is In this accommodated state, the switch 272 switches from off to on and outputs an on signal to the control section 32 . The ON signal is a signal (contact signal) indicating that the output plug 21 is connected to the relay outlet 3a.

In this embodiment, the protrusion 271 is provided on the peripheral edge of the contact surface 211a, but may be provided between the three blades 212-214. Moreover, in this embodiment, the number of protrusions 271 is one, but a plurality of protrusions 271 may be provided. In this case, each of the plurality of protrusions 271 detects the amount of protrusion of each protrusion 271 from the contact surface 211a. As a result, it is possible to detect not only whether the output plug 21 is connected to the relay outlet 3a, but also whether the output plug 21 is connected vertically to the relay outlet 3a or is connected obliquely. be able to.

In this embodiment, the connection detector 27 is provided only in the output plug 21, but may be provided in the input plug 20 as well. In this case, the connection detection unit provided in the input plug 20 detects whether or not the input plug 20 is connected to the output unit 4a of the distributed power source 4, and the control unit 32 detects whether the input plug is connected to the distributed power source 4. The electromagnetic switch 24 may be controlled to the closed state only when it is connected to the output section 4a.

Next, the operation of the power relay device 1 will be described with reference to the flowchart of FIG. In the following description, Sn (n=1, 2, . . . ) indicates each step in the flowchart of FIG.

A power failure occurs in the power system 2 (S1). In this situation, the user manually switches the master breaker 132 from the closed state to the open state (S2), or leaves the master breaker 132 in the closed state (S3), and switches the power relay device 1 to the distributed power source 4. and the relay outlet 3a (S4). At this time, the input plug 20 is connected to the output section 4a of the distributed power supply 4, and the output plug 21 is connected to the relay outlet 3a. When the output plug 21 is connected to the outlet 3, the connection detector 27 of the power relay device 1 detects the connection (S5).

After connecting the power relay device 1, the user activates the distributed power sources 4 (S6). As a result, power from the output section 4 a of the distributed power supply 4 is input to the input plug 20 .

Then, the continuity detection unit 25 of the power relay device 1 determines whether or not the main breaker 132 is open based on the impedance between the N-phase circuit and the E-phase circuit of the main circuit 23 of the power relay device 1. Detect (S7). As a result of this detection, if the master breaker 132 is in the open state (Yes in S7), the control unit 32 of the power relay device 1 controls the electromagnetic switch 24 from the open state to the closed state (S8). . As a result, power from the output unit 4a of the distributed power supply 4 is output to the relay outlet 3a via the power relay device 1. FIG. As a result, the electric power from the distributed power supply 4 flows from the relay outlet 3a through the electric circuit inside the distribution board 13 and is supplied to the other outlet 3b. As a result, power from the distributed power supply 4 is supplied to the electrical equipment 5 connected to the other outlet 3b. In this way, even when the power system 2 is out of power, the electric device 5 can be used by being connected to another outlet 3b.

The connection detection unit 27 of the power relay device 1 constantly detects whether or not the output plug 21 is connected to the relay outlet 3a (in other words, whether or not the output plug 21 is disconnected from the relay outlet 3a). (S9). When the user removes the output plug 21 of the power relay device 1 from the relay outlet 3a, the connection detector 27 of the power relay device 1 detects the removal (Yes in S9). Then, according to the detection result, the control unit 32 controls the electromagnetic switch 24 to open from the closed state (S10). Then, the processing of the power relay device 1 ends.

On the other hand, in step S9, if the output plug 21 of the power relay device 1 has not been removed from the relay outlet 3a (No in S9), the process returns to step S7, and the processes after step S7 are executed.

On the other hand, as a result of the detection in step S7, if the master breaker 132 is not in the open state (that is, in the closed state) (No in S7), the control unit 32 of the power relay device 1 opens the electromagnetic switch 24 from the closed state. (S11). As a result, power transmission from the distributed power supply 4 from the input plug 20 to the output plug 21 is cut off. As a result, it is possible to prevent the power from the distributed power source 4 from flowing backward to the power system 2 through the main breaker 132 .

Then, the control unit 32 of the power relay device 1 detects whether the detection result of the first voltage detection unit 28 (impedance between the L-phase pole and the N-phase pole of the output plug 21) exceeds a predetermined value ( S12). When the impedance detected by the first voltage detection unit 28 exceeds the predetermined value (Yes in S12), the control unit 32 determines that the ground leakage detection circuit 132a of the main breaker 132 is activated, and detects a false ground leakage. Activating circuit 26; That is, the control unit 32 controls the relay 26a so that it changes from the open state to the closed state (S13). As a result, a pseudo leakage occurs in the current flowing through the path T2 shown in FIG. 3, and the leakage detection circuit 132a detects the pseudo leakage, thereby controlling the main breaker 132 from the closed state to the open state. Thereby, it is possible to prevent the power from the distributed power source 4 from flowing backward to the power system 2 via the main breaker 132 .

Thus, when the trunk breaker 132 is switched from the open state to the closed state (S11), if the impedance detected by the first voltage detection unit 28 exceeds a predetermined value (Yes in S12), the electric power system 2 The voltage from the electric power system 2 activates the electric leakage detection circuit 132a of the main breaker 132 . For this reason, the control unit 32 activates the pseudo earth leakage circuit 26 to allow the pseudo earth leakage to flow, thereby using the function of the earth leakage detection circuit 132a of the main breaker 132 to forcibly switch the main breaker 132 from the open state to the closed state. is controlled to become

Then, the process returns from step S13 to step S7, and the processes after step S7 are executed. As a result, when the continuity detection unit 25 of the power relay device 1 detects that the main breaker 132 is open (Yes in S7), the control unit 32 of the power relay device 1 changes the state of the electromagnetic switch 24 from the open state. It is controlled to be in a closed state (S8). As a result, the power from the distributed power sources 4 is prevented from flowing backward to the power system 2, and the power from the distributed power sources 4 is supplied to the relay outlet 3a via the power relay device 1. FIG.

On the other hand, in step S12, when the impedance detected by the first voltage detection unit 28 is equal to or less than the predetermined value (No in S12), the control unit 32 determines that the electric power system 2 is not multiplying. That is, the control unit 32 determines that the switching of the main breaker 132 from the open state to the closed state in step S11 is an erroneous operation by the user. Then, the process returns to step S2, and the processes after step S2 are executed. As a result, after the user manually switches the main breaker 132 from the closed state to the open state (S2), the control unit 32 of the power relay device 1 performs each process (S4 to S7), and then the electromagnetic switch 24 is opened. It is controlled to change from the open state to the closed state (S8). As a result, the power from the distributed power sources 4 is prevented from flowing backward to the power system 2, and the power from the distributed power sources 4 is supplied to the relay outlet 3a via the power relay device 1. FIG.

(main effect)
As described above, according to the power relay device 1 of the present embodiment, by relaying the output unit 4 a of the distributed power supply 4 and one outlet 3 a of the plurality of outlets 3 , the other outlets 3 of the plurality of outlets 3 Power can be supplied from the distributed power source 4 to the outlet 3b. Therefore, the electric power from the distributed power supply 4 can be supplied to the grid power distribution system 10 of the building without requiring construction work (that is, with an inexpensive configuration). In addition, since power from the distributed power sources 4 is output to one outlet 3a when the main breaker 132 is open, reverse power flow from the distributed power sources 4 to the power system 2 can be prevented. Therefore, it is possible to supply electric power from the distributed power sources 4 to the grid power distribution system 10 with an inexpensive configuration and by preventing reverse power flow to the power grid 2 .

Further, since each of the input plug 20 and the output plug 21 is a male plug, the female output section 4a of the distributed power supply 4 and one outlet 3a can be relayed. That is, since the output part 4a of the general distributed power supply 4 is a female type, the output part 4a of the general distributed power supply 4 and one outlet 3a can be relayed. As a result, power from the distributed power source 4 can be supplied to the grid power distribution system 10 of the building using a general distributed power source 4 (that is, with an inexpensive configuration).

(Modification)
A modification of the above embodiment will be described. Modifications described below can be applied in combination as appropriate.

(Modification 1)
In the above embodiment, the continuity detector 25 opens the main breaker 132 based on whether the impedance between the N-phase pole and the E-phase pole of the three poles of the output plug 21 exceeds a predetermined value. state or not. However, the continuity detection unit 25 detects whether the main breaker 132 is open based on whether the impedance between the L-phase pole and the E-phase pole of the output plug 21 exceeds a predetermined value. may Further, the continuity detection unit 25 detects whether the main breaker 132 is open based on whether the impedance between the L-phase pole and the N-phase pole of the output plug 21 exceeds a predetermined value. may

(Modification 2)
In the above embodiment, the continuity detector 25 opens the main breaker 132 based on whether the impedance between the N-phase pole and the E-phase pole of the three poles of the output plug 21 exceeds a predetermined value. state or not. However, as shown in FIG. 6, the grid distribution system 10 may include a detector 40 (external device) that detects whether or not the main breaker 132 is open. In this case, the continuity detection unit 25 acquires from the detector 40 an open/close signal indicating whether or not the main breaker 132 is open, and determines whether the main breaker 132 is open based on the acquired open/close signal. It may be detected whether or not In this case, the continuity detection unit 25 and the detector 40 have communication functions (for example, wireless communication) to communicate with each other, and use these communication functions to transmit and receive the switching signals. In addition, although it is assumed that the above communication function performs wireless communication in this modified example, wired communication may be performed.

(Modification 3)
In the above embodiment, the continuity detector 25 opens the main breaker 132 based on whether the impedance between the N-phase pole and the E-phase pole of the three poles of the output plug 21 exceeds a predetermined value. state or not. However, as shown in FIG. 7, the power relay device 1 may include an operation input unit 50 that receives input of switching information by the user. In this case, the continuity detection unit 25 may detect whether or not the master breaker 132 is open based on the open/close information input to the operation input unit 50 . The opening/closing information mentioned above is information indicating whether or not the main breaker 132 is in the open state.

(Modification 4)
In Modified Example 3, as shown in FIG. 7 , the main electric line 23 of the power relay device 1 may further include an earth leakage breaker 33 . The earth leakage breaker 33 can be switched between an open state and a closed state, and cuts off and conducts the main electric circuit 23 according to the open state and the closed state. The earth leakage breaker 33 is closed when a current less than a specified value flows through the main electric circuit 23, and conducts the main electric circuit 23. It becomes an open state and cuts off the main electric line 23 . The earth leakage breaker 33 may be manually switched between the open state and the closed state. The earth leakage breaker 33 is provided, for example, between the electromagnetic switch 23 and the output plug 27 in the main electric line 23 (that is, the output stage of the power relay device 1). The earth leakage breaker 33 individually connects and disconnects the L-phase circuit and the E-phase circuit among the three circuits of the main circuit 23 . The earth leakage breaker 33 can protect the internal circuit of the power relay device 1 from earth leakage current or short-circuit current when there is an earth leakage or a short circuit inside the power distribution system 10 in the relay state of the power relay device 1 .

In addition, although the case where this modification is applied to the modification 3 is illustrated, it is applicable also to said embodiment or another modification.

(Modification 5)
In the above embodiment, all of the plurality of outlets 3 are assumed to be wall outlets provided on the walls of the building. A wall outlet is an outlet via indoor wiring. The indoor wiring is an electric circuit portion between the branch breaker 133 and the outlet 3 in the branch electric circuit 12 . However, the plurality of outlets 3 may include distribution board outlets as outlets other than wall outlets. The distribution board outlet is provided on the distribution board 13 and is an outlet with no indoor wiring. In this case, the output plug 27 of the power relay device 1 may be connected to a distribution board outlet. That is, in this case, the distribution board outlet becomes a relay outlet.

(Other modifications)
In the above-described embodiment, the control unit 32 of the power relay device 1 controls the master breaker 132 from the closed state to the open state in order to prevent reverse power. However, if the smart meter 14 is equipped with a switch that opens and closes the main electric circuit 11, the control unit 32 switches the switch of the smart meter 14 from the closed state to the open state instead of the main breaker 132 in order to prevent reverse flow. may be controlled. In this case, the switch of the smart meter 14 becomes the first switch.

Moreover, in the above-described embodiment, the power relay device 1 may further include a current detector that detects the current input to the input plug 20 (that is, the output current of the distributed power sources 4). In this case, the control unit 32 controls the electromagnetic switch 24 from the open state to the closed state when the current detected by the current detection unit exceeds a specified current (for example, the rated current of the outlet 3, for example, 15 A). Further, when the current detected by the current detection unit is equal to or less than the specified current, the control unit 32 controls the electromagnetic switch 24 to open from the closed state.

(summary)
A power relay device (1) of a first aspect includes one outlet (3a) of a plurality of outlets (3) that outputs power supplied from a power system (2) via a first switch (132). ) and the output section (4a) of the distributed power source (4). A first switch (132) conducts and interrupts an electric circuit (11) between a power system (2) and a plurality of outlets (3) depending on whether it is closed or opened. A power relay device (1) includes an open/close detector (25) and a power supply controller (32). The open/close detector (25) detects whether or not the first switch (132) is open. When the open/close detection unit (25) detects that the first switch (132) is open, the power supply control unit (32) reduces the power from the output unit (4a) of the distributed power supply (4) to one Output to outlet (3a).

According to this configuration, by relaying the output section (4a) of the distributed power supply (4) and one outlet (3a) of the plurality of outlets (3), one of the plurality of outlets (3) Other outlets (3b) can be supplied with power from the distributed power supply (4). Therefore, the electric power from the distributed power source (4) can be supplied to the building's grid power distribution system (10) without requiring construction work (that is, with an inexpensive configuration). In addition, when the first switch (132) is open , power from the distributed power supply (4) is output to one outlet (3a), so power from the distributed power supply (4) is supplied to the power system (2). It can prevent reverse flow. As described above, it is possible to supply electric power from the distributed power source (4) to the grid power distribution system (10) of the building with an inexpensive configuration and prevention of reverse power flow to the electric power system (2).

In the power relay device (1) of the second aspect, in the first aspect, the electric line (11) between the power system (2) and the plurality of outlets (3) branches to the plurality of outlets (3). It has multiple branch points. The first switch (132) is provided upstream of a plurality of branch points in the electric line (11).

According to this configuration, in order to prevent reverse flow of electric power from the distributed power supply (4) to the power system (2), a main breaker installed in the building or a smart meter is used as the first switch (132). It is possible to control the switch inside.

The power relay device (1) of the third aspect further comprises a second switch (24) in the first or second aspect. The second switch (24) conducts and interrupts the electric circuit (23) between the distributed power supply (4) and the one outlet (3a) depending on whether it is closed or opened. The power supply control unit (32) controls the opening and closing of the second switch (24) to control power output from the output unit (4a) of the distributed power supply (4) to one outlet (3a).

According to this configuration, by controlling the opening and closing of the second switch (24), it is possible to control the output of electric power from the output section (4a) of the distributed power supply (4) to the one outlet (3a). .

The power relay device (1) of the fourth aspect, in any one of the first to third aspects, further comprises a cutoff control section (32). The shut-off control section (32) controls the first switch (132) to open from the closed state when the first switch (132) is manually switched from the open state to the closed state.

According to this configuration, when the first switch (132) is manually switched from the open state to the closed state while the electric power from the distributed power supply (4) is being output to the one outlet (3a), The first switch (132) is controlled from the closed state to the open state by the cut-off control section (32). Therefore, it is possible to prevent the power from the distributed power supply (4) from flowing backward to the electric power system (2).

In the power relay device (1) of the fifth aspect, in the fourth aspect, the first switch (132) prevents leakage of the current flowing through the electric path (11, 23) via the first switch (132). It has the function of switching from the closed state to the open state when it is detected. The cut-off control section (32) causes the first switch (132) to open from the closed state by causing a pseudo-leakage of the current flowing through the electric circuit (11, 23) via the first switch (132). to control.

According to this configuration, the power relay device ( 1) can control the opening and closing of the first switch (132).

In the power relay device (1) of the sixth aspect, in any one aspect of the first to fifth aspects, the open/close detector (25) detects the electric path (11, 23), it is detected whether or not the first switch (132) is open.

According to this configuration, whether or not the first switch (132) is open is detected based on the conduction state of the electric circuit including the first switch (132). The open/closed state of the switch (132) can be detected.

In the power relay device (1) of the seventh aspect, in the sixth aspect, one outlet (3a) is a three-pole outlet (3) consisting of an L-phase pole, an N-phase pole and an E-phase pole. An open/close detection unit (25) detects a first open/close state based on the state of conduction between the N-phase pole and the E-phase pole or based on the state of conduction between the L-phase pole and the E-phase pole. detecting whether the device (132) is open.

According to this configuration, when the one outlet (3a) is a three-pole outlet, the conduction state between the N-phase pole and the E-phase pole of the one outlet (3a), or the L-phase pole and the E-phase pole of the one outlet (3a). The switching state of the first switch (132) can be detected with a low-cost configuration based on the state of continuity with the pole.

In the power relay device (1) of the eighth aspect, in any one of the first to seventh aspects, the open/close detector (25) detects whether or not the first switch (132) is open. An open/close signal representing whether or not is acquired from an external device (40). The open/close detector (25) detects whether or not the first switch (132) is open based on the acquired open/close signal.

According to this configuration, it is possible to detect whether or not the first switch (132) is open based on the switching signal obtained from the external device (40). That is, when the external device (40) detects the open/closed state of the first switch (132), the detection result is used to determine whether the first switch (132) is open. detectable.

The power relay device (1) of the ninth aspect includes an operation input section (50) in any one of the first to eighth aspects. The operation input unit (50) receives input of open/close information indicating whether or not the first switch (132) is open. The open/close detector (25) detects whether or not the first switch (132) is open based on the open/close information input to the operation input unit (50).

According to this configuration, when the operation input section (50) for receiving input of opening/closing information is provided, the opening/closing information input to the operation input section (50) is used to open the first switch (132). It can be detected whether or not

A power supply system according to a tenth aspect comprises a power relay device (1) according to any one of the first to ninth aspects and a distributed power supply (4).

According to this configuration, it is possible to provide a power supply system including the power relay device (1).

A power distribution system according to an eleventh aspect includes a power relay device (1) according to any one of the first to ninth aspects, and a grid power distribution system (10). A grid power distribution system (10) distributes power supplied from a power grid (2) through a first switch (132) to a plurality of outlets (3). A first switch (132) conducts and interrupts an electric circuit (11) between a power system (2) and a plurality of outlets (3) depending on whether it is closed or opened.

According to this configuration, it is possible to provide a power distribution system including the power relay device (1).

1 power relay device 2 power system 3, outlet 3a relay outlet (one outlet)
4 distributed power source 4a output unit 10 grid distribution system 11, 23 main electric circuit (electric circuit)
20 input plug 21 output plug 24 electromagnetic switch (second switch, relay side switch)
25 Continuity detector (open/close detector)
27 connection detection unit 32 control unit (interruption control unit, power supply control unit)
40 detector (external device)
50 operation input unit 132 main breaker (first switch, system side switch)

Claims (11)

A power relay device that relays one of a plurality of outlets that output power supplied from a power system via a first switch and an output unit of a distributed power supply,
The first switch conducts and interrupts an electric circuit between the electric power system and the plurality of outlets according to a closed state and an open state,
an open/close detector that detects whether the first switch is in an open state;
a power supply control unit that outputs power from the output unit of the distributed power supply to the one outlet when the open/close detection unit detects that the first switch is in an open state;
Power relay device. an electric circuit between the electric power system and the plurality of outlets has a plurality of branch points branching to the plurality of outlets;
The first switch is provided upstream of the plurality of branch points in the electric circuit,
The power relay device according to claim 1. Further comprising a second switch that conducts and interrupts an electric circuit between the distributed power supply and the one outlet according to the closed state and the open state,
The power supply control unit controls the output of power from the output unit of the distributed power supply to the one outlet by controlling the opening and closing of the second switch.
The power relay device according to claim 1 or 2. Further comprising a cut-off control unit that controls the first switch to open from the closed state when the first switch is manually switched from the open state to the closed state,
The power relay device according to any one of claims 1 to 3. The first switch has a function of switching from a closed state to an open state when leakage of a current flowing through an electric path passing through the first switch is detected,
The cutoff control unit controls the first switch from a closed state to an open state by causing a pseudo leakage of the current flowing in the electric path passing through the first switch.
The power relay device according to claim 4. The open/close detection unit detects whether or not the first switch is in an open state based on the conduction state of the electric path passing through the first switch.
The power relay device according to any one of claims 1 to 5. The one outlet is a three-pole outlet consisting of an L-phase pole, an N-phase pole, and an E-phase pole,
The open/close detector detects the first switch based on the conduction state between the N-phase pole and the E-phase pole or based on the conduction state between the L-phase pole and the E-phase pole. is open,
The power relay device according to claim 6. The opening/closing detection unit acquires an opening/closing signal indicating whether or not the first switch is in an open state from an external device, and determines whether or not the first switch is in an open state based on the acquired opening/closing signal. to detect whether
The power relay device according to any one of claims 1-7. An operation input unit that receives input of switching information indicating whether the first switch is in an open state,
The opening/closing detection unit detects whether the first switch is in an open state based on the opening/closing information input to the operation input unit.
The power relay device according to any one of claims 1-8. a power relay device according to any one of claims 1 to 9;
and the distributed power source;
power system. A power relay device according to any one of claims 1 to 9 and a grid power distribution system,
The grid distribution system distributes power supplied from the power grid via the first switch to the plurality of outlets, and the first switch connects to the power grid according to a closed state and an open state. Conducting and interrupting an electric circuit between the plurality of outlets;
distribution system.

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