JP2021100328A - Power relay device, power supply system, and power distribution system - Google Patents

Abstract

To provide a power relay device capable of supplying electric power from distributed power supplies to the system power distribution system in a building while preventing reverse tide to an electric power system with an inexpensive configuration.SOLUTION: A power relay device 1 relays one outlet 3a out of multiple outlets 3 for outputting electric power supplied from an electric power system 2 via a main breaker 132 and an output part 4a of a distributed power supply 4. The main breaker 132 conducts or cuts off a main line 11 between the electric power system 2 and multiple outlets 3 depending on an open/closed state. The power relay device 1 includes a conduction-detect unit 25 and a control unit 32. The conduction-detect unit 25 detects whether the main breaker 132 is open state or not. When the conduction detect unit 25 detects that the main breaker 132 is the open state, the control unit 32 outputs the electric power from the output part 4a of the distributed power supply 4 to one outlet 3a.SELECTED DRAWING: Figure 1

Description

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

As a means for supplying electric power to the system distribution system of a building in the event of a power failure, the manual power switching device for a house described in Patent Document 1 is known. This manual power switching device for a house is provided with a switching switch for switching between a normal power supply and an emergency power supply. Normally, by manually connecting the switching switch to the regular power supply side, the power from the regular power supply is output to the distribution system of the building. In an emergency, the switching switch is manually connected to the emergency power supply, so that the power from the emergency power supply is output to the distribution system of the building.

Utility model registration No. 3113914

In the manual power switching device for a house described in Patent Document 1, when the manual power switching device for a house is installed in a building, it is necessary to perform a large-scale electrical work on a distribution board or the like installed in the building. Yes, it costs a lot. Further, when the electric power from the emergency power source (distributed power source) is output to the system distribution system of the building, it is necessary to prevent the electric power from the emergency power source from flowing back to the normal power source (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 source to a system power distribution system of a building with an inexpensive configuration and preventing a reverse tide to the power system. To do.

The power relay device according to one aspect of the present disclosure relays between one of a plurality of outlets that output power supplied from the power system via the first switch and an output unit of a distributed power source. The first switch conducts and cuts off an electric circuit between the 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 detection unit detects whether or not the first switch is in the open state. When the open / close detection unit detects that the first switch is in the open state, the power supply control unit outputs the electric power from the output unit of the distributed power source to the one outlet.

The power supply system of one aspect of the present disclosure includes the power relay device and the distributed power source.

The power distribution system according to one aspect of the present disclosure includes the power relay device and a grid power distribution system. The system distribution system distributes the electric power supplied from the electric power system to the plurality of outlets via the first switch, and the first switch is connected to the electric power system according to the closed state and the open state. Conducts and cuts off electric lines between the plurality of outlets.

The present disclosure can have an effect that the electric power from the distributed power source can be supplied to the distribution system of the building by preventing the back tide to the electric power system with an inexpensive configuration.

FIG. 1 is a block diagram of each of the power relay device, the grid distribution system, and the distributed power source according to the embodiment. FIG. 2 is an explanatory diagram illustrating the operation of the continuity detection unit of the power relay device of the above. FIG. 3 is an explanatory diagram illustrating the operation of the pseudo-leakage circuit of the power relay device of the above. FIG. 4A is a side view of the output plug of the power relay device of the same as above, as viewed from the side by partially seeing through. FIG. 4B is a front view of the contact surface of the output plug as seen from the front. FIG. 5 is a flowchart illustrating the operation of the power relay device of the above. FIG. 6 is a block diagram of each of the power relay device and the grid distribution system according to the second modification. FIG. 7 is a block diagram of the power relay device according to the modified example 3 and the modified example 4.

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

As shown in FIG. 1, the power relay device 1 relays between the outlet 3a of one of a plurality of outlets 3 that output power from the power system 2 and the output unit 4a of the distributed power source 4. As a result, the electric power from the distributed power source 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 a typhoon, the distributed power source 4 can supply power to the electric device 5 connected to the other outlet 3b. Hereinafter, the power relay device 1 will be described in detail.

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

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

The pole transformer 6 includes a primary coil 61 and a secondary coil 62 wound around an iron core. The two electric circuits from the power system 2 are connected to both ends of the primary coil 61. The three electric circuits from the grid distribution system 10 are connected to both ends and the center of the 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 grounding point A1. The electrical resistance at the grounding point A1 is, for example, 10 Ω 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 grid distribution system 10 includes a main electric line 11, a plurality of branch electric 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 connecting the pole transformer 6 and the system distribution system 10, and is drawn into the system distribution system 10. The main electric line 11 is composed of the above three electric lines (L1 phase electric line, L2 phase electric line and N phase electric line).

The plurality of branch electric lines 12 are electric lines branched from a plurality of branch points on the main electric line 11, and are electric lines connecting the main electric line 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 include 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 line 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 line 12.

The distribution board 13 is a device that distributes the electric power transmitted from the pole transformer 6 through the main electric circuit 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 the electric power transmitted through the main electric circuit 11 to a plurality of outlets 3. The branch circuit 131 is composed of a main electric circuit 11 (more specifically, a portion of the main electric circuit 11 drawn into the distribution board 13) and a plurality of branch electric circuits 12.

The main breaker 132 (first switch, system side switch) is provided on the upstream side of a plurality of branch points in the main electric circuit 11. The main breaker 132 is provided on the downstream side of the pole transformer 6 in the main electric circuit 11. In the present embodiment, the main breaker 132 is provided in the main electric line 11, but it may be provided at any position as long as it is an electric line between the power system 2 and the plurality of outlets 3. The main breaker 132 switches to an open state or a closed state depending on whether or not the amount of current flowing through the main electric circuit 11 exceeds a specified value. Then, the main breaker 132 conducts and cuts off 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 main breaker 132 collectively conducts and cuts off the electric power transmitted to the plurality of outlets 3.

When the main circuit breaker 132 cuts off the main electric circuit 11, it means that all three electric circuits constituting the main electric circuit 11 are cut off, and when the main breaker 132 conducts the main electric circuit 11, it constitutes the main electric circuit 11. It is to make all three electric circuits conductive.

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 circuit 11 via the main breaker 132 (that is, the current supplied from the power system 2 to the plurality of outlets 3) is leaking. When the leakage detection circuit 132a does not detect the leakage, the leakage detection circuit 132a maintains the main breaker 132 in the closed state and keeps the main electric path 11 in the conduction state. Further, when the electric leakage detection circuit 132a detects the electric leakage, the main electric circuit 11 is cut off by switching the main breaker 132 from the closed state to the open state. The main breaker 132 can be manually switched between the open state and the closed state. Therefore, when the main circuit 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 circuit breaker 132 from the open state to the closed state.

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

The plurality of branch breakers 133 have a one-to-one correspondence with the plurality of branch electric circuits 12, and are provided in the corresponding branch electric circuits 12. The plurality of branch breakers 133 are switched to an open state or a closed state depending on whether or not the amount of current flowing through the corresponding branch electric circuit 12 satisfies a predetermined condition, and the corresponding branch electric circuit is switched according to the closed state and the open state. 12 is conducted and cut off. The above-mentioned predetermined condition is, for example, a condition that a current of a predetermined value (for example, 20 A) flows through the branch electric circuit 12 for a predetermined time (for example, 1 hour). The plurality of branch breakers 133 individually conduct and cut off the electric power transmitted to the plurality of outlets 3 for each outlet 3. When the branch breaker 133 cuts off the branch electric circuit 12, it means that all the two electric circuits constituting the branch electric circuit 12 are cut off, and when the branch breaker 133 conducts the branch electric circuit 12, it constitutes the branch electric circuit 12. It is to make all two electric circuits conductive.

The plurality of grounding terminals 134 are terminals used when grounding the E-phase pole (grounding pole) described later of each outlet 3. Each of the plurality of ground terminals 134 is grounded at the ground point A2. The electrical resistance at the grounding 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 wire. The E-phase pole of each outlet 3 is grounded to the grounding point A2 by being connected to the grounding terminal 134.

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

The plurality of outlets 3 are installed inside or outside the building. The plurality of outlets 3 are outlets into which the power plugs of the electric devices 5 are inserted, and power is supplied to the electric devices 5 through the inserted power plugs. The electric device 5 is, for example, a lighting fixture, a refrigerator, a television, or the like.

Of the plurality of outlets 3, at least one outlet 3 is a three-pole outlet. A 3-pole outlet is an outlet having a 3-pole individual outlet. The 3-pole individual port is an individual port having three insertion ports corresponding to three plug blades (L-phase pole, N-phase pole and E-phase pole (grounding pole)) of the three-pole plug. The 3-pole outlet may further have a 2-pole outlet. The two-pole port is a port having only two outlets corresponding to the two blades (L-phase pole and N-phase pole) of the two-pole plug. In the present embodiment, of 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 two-pole outlet is an outlet that has only a two-pole outlet. It should be noted 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. Of the outlets 3 on the L2 side, only the outlet 3a is a 3-pole outlet, and the remaining outlet 3b is a 2-pole outlet. The L-phase pole and the N-phase pole of the two-pole outlet 3c on the L1 side are connected to the L1 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, 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 connected to the L2-phase electric circuit and the N-phase electric circuit of the main electric circuit 11 via the two electric circuits of the branch electric circuit 12, respectively. The E-phase pole is connected to the ground terminal 134 via the electric circuit 16. The L-phase pole and the N-phase pole of the two-pole outlet 3b on the L2 side are 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, respectively.

The plurality of outlets 3 include an indoor outlet and an outdoor outlet. The outdoor outlet is an outlet installed outside the building (for example, an outer wall), and in the present embodiment, the three-pole outlet 3a is an outdoor outlet. The indoor outlet is an outlet installed inside the building, and in the present 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 system distribution system 10, the electric power from the electric power system 2 (for example, 6600V) is stepped down to a predetermined electric power (for example, 100V / 200V, 15A) by the pole transformer 6 and then transmitted to the distribution board 13 through the main electric circuit 11. Will be done. The electric power transmitted to the distribution board 13 is distributed to the plurality of outlets 3 through the plurality of branch electric circuits 12 after passing through the main breaker 132. Power of a predetermined standard (for example, 100V, 15A) can be output from each outlet 3. The electric power transmitted to each outlet 3 is supplied to the electric device 5 connected to the outlet 3. The leakage detection circuit 132a of the main circuit breaker 132 operates using the voltage applied to the main circuit 11 as an operating power source, and detects the leakage of the current flowing through the main circuit 11. When the electric leakage detection circuit 132a detects an electric leakage, the main circuit breaker 132 is switched from the closed state to the open state to shut off the main electric circuit 11. By this interruption, the supply of electric power from the electric power system 2 to the plurality of outlets 3 is stopped. By manually switching the main breaker 132 from the open state to the closed state, it is possible to restart the supply of electric power from the power system 2 to the plurality of outlets 3.

In the present embodiment, the power relay device 1 and the distributed power source 4 constitute a power supply system that supplies power to the system distribution system 10 installed in the building. Further, the power relay device 1 and the system 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 backup power source for the power system 2. The backup power source is a power source that supplies AC power instead of the power system 2 when the power system 2 cannot be used. The distributed power source 4 is, for example, a generator or a solar power generator. The generator is a generator that uses gasoline, LP gas, or the like as fuel. Further, the distributed power source 4 may be a power output unit (for example, an AC100V outlet) provided in a hybrid vehicle, an electric vehicle, or the like. The distributed power source 4 has an output unit 4a that outputs electric power. The output unit 4a is a female type output unit (that is, a structure having an insertion port into which a plug is inserted). The output unit 4a is a 3-pole output unit having a 3-pole individual port.

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

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

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

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

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

(Feature 2)
The power relay device 1 controls the main breaker 132 to be forcibly changed from the closed state to the open state when the main breaker 132 is in the closed state when the power relay device 1 is connected and in the relay state. As a result, even if the main breaker 132 is in the closed state when the power relay device 1 is connected, or even if the main breaker 132 is manually switched from the open state to the closed state in the relay state of the power relay device 1, the distributed state is distributed. It is possible to prevent the electric power from the power source 4 from flowing back to the electric 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 unit 4a of the distributed power source 4 and the output plug 21 is not connected to the relay outlet 3a. To do. As a result, it is possible to prevent the blade of the output plug 21 from being exposed while the output voltage of the distributed power source 4 is 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 (input plug 20 and output plug 21) and a device main body 22.

The input plug 20 is connected to the output unit 4a of the distributed power source 4 and inputs the power output from the distributed power source 4. The output plug 21 is connected to one of the plurality of outlets 3 (relay outlet) 3a, and outputs the power from the distributed power source 4 input to the input plug 20 to the relay outlet 3a. The two plugs 20 and 21 are male plugs and are three-pole plugs, respectively. A 3-pole plug is a plug having 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 climaxes are connected to each other. The three poles of the output plug 21 are connected to the three poles of the output unit 4a of the distributed power source 4 so that the same climaxes are connected to each other. The two plugs 20 and 21 are connected to the device main body 22 via wiring, respectively. The input plug 20 is connected to the relay outlet 3a, and the output plug 21 is connected to the output unit 4a of the distributed power source 4, so that the power relay device 1 relays the relay outlet 3a and the output unit 4a of the distributed power source 4. ..

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

The main electric circuit 23 is an electric circuit for transmitting the electric power input to the input plug 20 to the output plug 21. The main electric line 23 is composed of three electric lines (L-phase electric line, N-phase electric line and E-phase electric line). The L-phase electric path, the N-phase electric path, and the E-phase electric path electrically connect the L-phase poles, the N-phase poles, and the E-phase poles of the two plugs, respectively. The portion of the main electric path 23 that is pulled out of the device main body 22 and connected to the plugs 20 and 21 constitutes the above wiring for connecting the plug 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 shuts off the main electric path 23 according to the closed state and the open state. By this continuity and interruption, power is transmitted from the input plug 20 to the output plug 21 and the power transmission is stopped. More specifically, the electromagnetic switch 24 individually conducts and cuts off two of the three electric circuits (L-phase electric circuit and N-phase electric circuit) constituting the main electric circuit 23 according to the closed state and the open state. To do.

The continuity detection unit 25 (open / close detection unit) is a main breaker based on the continuity state of the electric circuit (in other words, the electric circuit including the main electric circuit 11) passing through the main breaker 132 when the power relay device 1 is connected and in the relay state. Detects whether or not 132 is in the open state. More specifically, the continuity detection unit 25 is connected between the output plug 21 and the electromagnetic switch 24 between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 23 when the power relay device 1 is connected and in the relay state. The conduction state of the above electric circuit is detected based on the impedance. 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 is the impedance between the N-phase pole and the E-phase pole of the three poles of the output plug 21. Is the same as detecting the impedance between the N-phase pole and the E-phase pole of the three poles of the relay outlet 3a.

The pseudo-leakage circuit 26 causes a pseudo-leakage of the current flowing through the main electric circuit 23 of the power relay device 1 when the main breaker 132 is in the relay state of the power relay device 1. As a result, the current flowing through the main electric circuit 11 (the electric circuit passing through the main breaker 132) of the distribution board 13 is quasi-leaked. The pseudo-leakage circuit 26 controls the main breaker 132 to be forced from the closed state to the open state by causing the leakage detection circuit 132a of the main breaker 132 to detect the above-mentioned pseudo-leakage.

The pseudo-leakage circuit 26 flows through the main electric circuit 23 by short-circuiting the L-phase electric circuit and the N-phase electric circuit of the main electric circuit 23 between the output plug 21 and the electromagnetic switch 24 in the relay state of the electric power relay device 1. Causes a pseudo-leakage in the current. The pseudo earth leakage circuit 26 includes a relay 26a and a resistor 26b. The relay 26a and the resistor 26b are connected between the L-phase electric circuit and the N-phase electric circuit of the main electric circuit 23 in a state of being connected in series with each other. The L-phase electric circuit and the N-phase electric circuit are conducted and cut off according to the closed state and the open state of the relay 26a, and the L-phase electric circuit and the N-phase electric circuit are short-circuited by the conduction.

The connection detection unit 27 is provided on 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 non-connection signal to the control unit 32 depending on whether or not 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 determines whether or not the voltage output from the relay outlet 3a to the output plug 21 exceeds a predetermined voltage (for example, 0V) in the relay state of the power relay device 1 and in the open state of the electromagnetic switch 24. To detect. More specifically, the first voltage detection unit 28 determines whether or not 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. Is detected. Thereby, it is possible to detect whether the power system 2 is in a power failure or has multiple powers. That is, when the detection voltage of the first voltage detection unit 28 is equal to or lower than the predetermined voltage, the power system 2 is determined to be in a power failure, and when the detection voltage of the first voltage detection unit 28 exceeds the predetermined voltage, the power system 2 is determined. Is judged to be double-voltage.

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 source 4) exceeds the specified voltage (for example, the rated voltage of the outlet 3, for example, 100 V). More specifically, the second voltage detection unit 29 is in the relay state of the power relay device 1 and in the open state of the electromagnetic switch 24, and is connected to the L-phase electric circuit of the main electric circuit 23 between the electromagnetic switch 24 and the input plug 20. Detects whether or not the voltage between the E-phase electric circuit and the E-phase electric circuit exceeds the specified voltage.

When the detection voltage of 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 it is prohibited that the output of the distributed power source 4 is transmitted to the output plug 21. May be done.

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

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

The display unit 31 displays various information regarding 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 (cutoff control unit and power supply control unit) is electromagnetically driven according to the detection results of each detection unit (continuity detection unit 25, connection detection unit 27, first voltage detection unit 28, and second voltage detection unit 29). 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 in the closed state when the power relay device 1 is connected or in the relay state, the control unit 32 closes the electromagnetic switch 24 from the closed state. Control so that it is in the open state. As a result, the main electric circuit 23 of the power relay device 1 is cut off. Therefore, it is prohibited that the electric power from the distributed power source 4 is output to the relay outlet 3a through the power relay device 1. As a result, the power from the distributed power source 4 is prevented from flowing back to the power system 2. In this way, the control unit 32 controls the output (transmission) of electric power from the distributed power source 4 to the relay outlet 3a by controlling the opening and closing of the electromagnetic switch 24.

Further, when the continuity detection unit 25 detects that the main breaker 132 is in the open state 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 circuit 23 of the power relay device 1 becomes conductive, and the electric power from the distributed power source 4 is output to the relay outlet 3a through the main electric circuit 23. In this way, with the main breaker 132 open, the control unit 32 outputs the power from the distributed power source 4 to the relay outlet 3a. As a result, the electric power from the distributed power source 4 is supplied from the relay outlet 3a to the other outlets 3b through the electric circuit in the distribution board 13.

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

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

More specifically, the control unit 32 detects the first voltage detection unit 28 when the continuity detection unit 25 detects that the main breaker 132 is in the open state when the power relay device 1 is connected or in the relay state. When the voltage exceeds a predetermined voltage (for example, 0V), the pseudo leakage circuit 26 is controlled to be started, and when the detection voltage of the first voltage detection unit 28 is not more than the predetermined voltage, the pseudo leakage circuit 26 is stopped. To control.

Further, when the detection voltage of the second voltage detection unit 29 exceeds the specified voltage (for example, the rated voltage of the outlet 3, for example, 100V) when the power relay device 1 is connected or in the relay state, the control unit 32 is, for example, electromagnetic. The switch 24 is controlled from the closed state to the open state. As a result, it is prohibited that the electric power exceeding the specified voltage is output from the distributed power source 4 to the relay outlet 3a through the power relay device 1. Further, the control unit 32 changes the electromagnetic switch 24 from the open state to the closed state when the detection voltage of 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. To control. As a result, the electric 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.

Next, the above-mentioned 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 the power from the distributed power source 4 to the relay outlet 3a only when the main breaker 132 is in the open state when the power relay device 1 is connected and in the relay state.

More specifically, the continuity detection unit 25 has a predetermined value (for example, 200Ω) of impedance between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 23 of the power relay device 1 when the power relay device 1 is connected or in the relay state. ) Detects whether or not it is less than or equal to. As a result, 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 circuit breaker 132 is in the open state according to the detection result.

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

When the path T1 is conducting, the impedance detected by the continuity detecting unit 25 is approximately the sum of the grounding resistances at the two grounding points A1 and A2 (for example, 110Ω). On the other hand, when the path T1 is not conducting, the impedance detected by the continuity detecting unit 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 conducting (that is, the main breaker 132 is in the closed state). To 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 conducting (that is, the main breaker 132 is in the open state).

More specifically, the continuity detection unit 25 applies a predetermined voltage (voltage of about several V) between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 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. Then, 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, the electric circuits 11 and 23 via the main breaker 132). Detects whether or not is conducting. At the time of this detection, it is desirable that the electromagnetic switch 24 is controlled to the open state by the control unit 32.

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

Further, when the continuity detection unit 25 is repeatedly detected at a relatively short fixed interval (for example, 1 second interval), when the main breaker 132 is manually switched from the open state to the closed state, the main breaker 132 is promptly switched. The closed state can be detected.

If the main breaker 132 is in the closed state and the electromagnetic switch 24 is in the closed state, the electric power from the distributed power source 4 may flow back to the power system 2. Therefore, in this case, the electromagnetic switch 24 is maintained in the open state by the control unit 32. As a result, the electrical connection between the output unit 4a of the distributed power source 4 and the relay outlet 3a is cut off. On the other hand, when the main breaker 132 is in the open state, even if the electromagnetic switch 24 is in the closed state, there is no possibility that the power from the distributed power source 4 will flow back to the power system 2. Therefore, in this case, the electromagnetic switch 24 is controlled by the control unit 32 from the open state to the closed state. As a result, the output unit 4a of the distributed power source 4 and the relay outlet 3a are electrically connected.

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

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

For example, if the main 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 leakage detection circuit 132a of the main breaker 132 is activated. In this case, the pseudo-leakage circuit 26 of the power relay device 1 causes a pseudo-leakage of the current flowing through the path T2 (that is, the electric circuit passing through the main breaker 132) shown in FIG. 3, and causes the leakage detection circuit 132a to detect this pseudo-leakage. When the leakage detection circuit 132a detects a pseudo leakage, the main breaker 132 automatically switches from the closed state to the open state. In this way, when the leakage detection circuit 132a is activated, the power relay device 1 generates a pseudo leakage by the pseudo leakage circuit 26, and causes the leakage detection circuit 132a to detect the pseudo leakage, thereby causing the main breaker 132 to operate. It is controlled to forcibly change from the closed state to the open state.

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

More specifically, in the present embodiment, the continuity detection unit 25 detects that the main breaker 132 is in the closed state 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-leakage circuit 26 (that is, to change the relay 26a from the open state to the closed state).

In the present embodiment, as described above, the pseudo-leakage circuit 26 is activated (operated) according to the detection result of the continuity detection unit 25. However, the pseudo-leakage circuit 26 may be operated at all times regardless of the detection result of the continuity detection unit 25. That is, the relay 26a may be kept in a closed state at all times. In this case, when the main breaker 132 is switched from the open state to the closed state while the power system 2 is supplying power (including after double power generation) in the relay state of the power relay device 1 (that is, the closed state of the electromagnetic switch 24). Temporarily, the power supply from the power system 2 and the power supply from the distributed power source 4 are performed in parallel. However, when the leakage detection circuit 132a detects the pseudo leakage 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 always kept in the closed state and the electromagnetic switch 24 is in the closed state), the potential of the E-phase electric circuit of the main electric 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.

It is desirable that the relay 26a of the pseudo-leakage circuit 26 is controlled to the open state when the electromagnetic switch 24 is in the open state.

Next, the above-mentioned 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 main body 211, three blades 212 to 214, and a connection detection unit 27. The connection detection unit 27 includes a protrusion 271 and a switch 272.

The three plug blades 212 to 214 are the L-phase pole plug blade 212, the N-phase pole plug blade 213, and the E-phase pole plug blade 214, respectively. The plug body 211 is a member that holds the three plug blades 212 to 214. The plug body 211 has a contact surface 211a. The contact surface 211a is a flat surface that comes into contact with 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 plug blades 212 to 214 project from the contact surface 211a in the normal direction of the contact surface 211a.

The protrusion 271 is provided on the plug main body 211 so that it can protrude from the hole on the contact surface 211a and can be accommodated inside the hole. The protruding portion 271 is urged by an elastic member so as to protrude from the above-mentioned hole portion of the contact surface 211a. The elastic member is housed inside the hole. The protrusion 271 can be pushed into the hole (that is, can be accommodated inside the hole) against the urging force of the elastic member by an external force. The protrusion 271 is provided on the peripheral edge of the contact surface 211a, for example.

The switch 272 is provided inside the plug main body 211. The switch 272 is switched on or off depending on the protruding state and the accommodating state of the protrusion 271. When the protrusion 271 is in the protruding state, the switch 272 switches from on to off and outputs an off signal to the control unit 32, and when the protrusion 271 is in the accommodated state, the switch 272 switches from off to on and the on signal. 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 protruding state, the switch 272 switches from on to off and outputs an off signal to the control unit 32. In the present 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 comes into contact with the relay outlet 3a and is pushed into the inside of the above-mentioned hole by the relay outlet 3a to be accommodated. There is. In this accommodation state, the switch 272 switches from off to on and outputs an on signal to the control unit 32. The on signal is a signal (contact signal) indicating that the output plug 21 is connected to the relay outlet 3a.

In the present embodiment, the protrusion 271 is provided on the peripheral edge of the contact surface 211a, but may be provided between the three plug blades 212 to 214. Further, in the present 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 detected 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 at an angle. be able to.

In the present embodiment, the connection detection unit 27 is provided only on the output plug 21, but may be further provided on the input plug 20. 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 unit 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 main breaker 132 from the closed state to the open state (S2), or leaves the main breaker 132 in the closed state (S3), and then sets the power relay device 1 to the distributed power source 4 It is connected between the output unit 4a of the above and the relay outlet 3a (S4). At this time, the input plug 20 is connected to the output unit 4a of the distributed power source 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 detection unit 27 of the power relay device 1 detects the connection (S5).

Further, the user activates the distributed power source 4 after connecting the power relay device 1 (S6). As a result, the electric power from the output unit 4a of the distributed power source 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 in the open state based on the impedance between the N-phase electric circuit and the E-phase electric circuit of the main electric circuit 23 of the power relay device 1. Detect (S7). As a result of this detection, when the main 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, the electric power from the output unit 4a of the distributed power source 4 is output to the relay outlet 3a via the power relay device 1. As a result, the electric power from the distributed power source 4 flows from the relay outlet 3a through the electric circuit inside the distribution board 13 and is supplied to the other outlets 3b. As a result, the electric power from the distributed power source 4 is supplied to the electric device 5 connected to the other outlet 3b. In this way, even when the power system 2 has a power failure, the electric device 5 can be connected to another outlet 3b for use.

Then, 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). Yes (S9). Then, when the user removes the output plug 21 of the power relay device 1 from the relay outlet 3a, the connection detection unit 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 from the closed state to the open state (S10). Then, the processing of the power relay device 1 is completed.

On the other hand, if the output plug 21 of the power relay device 1 is not removed from the relay outlet 3a in step S9 (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, when the main 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. It is controlled so as to be in a state (S11). As a result, the power transmission from the distributed power source 4 from the input plug 20 to the output plug 21 is cut off. As a result, it is possible to prevent the electric power from the distributed power source 4 from flowing back to the electric power system 2 through the main breaker 132.

Then, the control unit 32 of the power relay device 1 detects whether or not the detection result (impedance between the L-phase pole and the N-phase pole of the output plug 21) of the first voltage detection unit 28 exceeds a predetermined value ( S12). When the impedance detected by the first voltage detection unit 28 exceeds a predetermined value (Yes in S12), the control unit 32 determines that the leakage detection circuit 132a of the main breaker 132 is activated, and pseudo-leakage occurs. The circuit 26 is activated. That is, the control unit 32 controls the relay 26a 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 to control the main breaker 132 from the closed state to the open state. As a result, it is possible to prevent the electric power from the distributed power source 4 from flowing back to the electric power system 2 via the main breaker 132.

In this way, when the main breaker 132 is switched from the open state to the closed state (S11) and the impedance detected by the first voltage detection unit 28 exceeds a predetermined value (Yes in S12), the power system 2 The leakage detection circuit 132a of the main breaker 132 is activated by the voltage from the power system 2 due to the double power generation. Therefore, the control unit 32 forcibly opens the main breaker 132 from the open state to the closed state by using the function of the leakage detection circuit 132a of the main breaker 132 by activating the pseudo leakage circuit 26 to flow the pseudo leakage. It is controlled to be.

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 in the open state (Yes in S7), the control unit 32 of the power relay device 1 starts the electromagnetic switch 24 from the open state. It is controlled to be in the closed state (S8). As a result, the power from the distributed power source 4 is prevented from flowing back to the power system 2, and the power from the distributed power source 4 is supplied to the relay outlet 3a via the power relay device 1.

On the other hand, in step S12, when the impedance detected by the first voltage detection unit 28 is equal to or less than a predetermined value (No in S12), the control unit 32 determines that the power system 2 is not double-powered. That is, the control unit 32 determines that the switching from the open state to the closed state of the main circuit breaker 132 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, the control unit 32 of the power relay device 1 manually switches the main breaker 132 from the closed state to the open state (S2), and then undergoes each process (S4 to S7) to switch the electromagnetic switch 24. It is controlled to change from the open state to the closed state (S8). As a result, the power from the distributed power source 4 is prevented from flowing back to the power system 2, and the power from the distributed power source 4 is supplied to the relay outlet 3a via the power relay device 1.

(Main effect)
As described above, according to the power relay device 1 of the present embodiment, by relaying the output unit 4a of the distributed power source 4 and the outlet 3a of one of the plurality of outlets 3, the other of the plurality of outlets 3 is relayed. Power from the distributed power source 4 can be supplied to the outlet 3b. Therefore, the electric power from the distributed power source 4 can be supplied to the system distribution system 10 of the building without requiring any construction work (that is, in an inexpensive configuration). Further, since the electric power from the distributed power source 4 is output to one outlet 3a in the open state of the main breaker 132, it is possible to prevent the electric power from the distributed power source 4 from flowing back to the power system 2. Therefore, it is possible to supply the electric power from the distributed power source 4 to the grid distribution system 10 with an inexpensive configuration and prevent the back tide to the electric power system 2.

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

(Modification example)
A modified example of the above embodiment will be described. The modifications described below can be applied in combination as appropriate.

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

(Modification 2)
In the above embodiment, the continuity detection unit 25 opens the main breaker 132 based on whether or not 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. Detects whether or not it is in a state. 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 in the open state. In this case, the continuity detection unit 25 acquires an open / close signal indicating whether or not the main breaker 132 is in the open state from the detector 40, and based on the acquired open / close signal, whether the main breaker 132 is in the open state. You may detect whether or not. In this case, the continuity detection unit 25 and the detector 40 have communication functions for communicating with each other (for example, wireless communication), and use those communication functions to send and receive the above-mentioned open / close signal. In this modification, the above communication function is assumed to perform wireless communication, but wired communication may be performed.

(Modification example 3)
In the above embodiment, the continuity detection unit 25 opens the main breaker 132 based on whether or not 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. Detects whether or not it is in a state. However, as shown in FIG. 7, the power relay device 1 may include an operation input unit 50 that receives input of opening / closing information by the user. In this case, the continuity detection unit 25 may detect whether or not the main breaker 132 is in the open state based on the opening / closing information input to the operation input unit 50. The opening / closing information is information indicating whether or not the main breaker 132 is in the open state.

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

Although this modification exemplifies the case where it is applied to the modification 3, it can also be applied to the above embodiment or other modifications.

(Modification 5)
In the above embodiment, all of the plurality of outlets 3 are assumed to be wall outlets provided on the wall of the building. A wall outlet is an outlet that goes through 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 a distribution board outlet as an outlet that is not a wall outlet. The distribution board outlet is provided on the distribution board 13 and has no indoor wiring. In this case, the output plug 27 of the power relay device 1 may be connected to the distribution board outlet. That is, in this case, the distribution board outlet becomes a relay outlet.

(Other variants)
In the above embodiment, the control unit 32 of the power relay device 1 controls the main breaker 132 from the closed state to the open state in order to prevent reverse tide. However, when the smart meter 14 is provided with a switch for opening and closing the main electric circuit 11, the control unit 32 changes 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 tide. You may control it. In this case, the switch of the smart meter 14 becomes the first switch.

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

(Summary)
The power relay device (1) of the first aspect is one of a plurality of outlets (3) that output power supplied from the power system (2) via the first switch (132) (3a). ) And the output unit (4a) of the distributed power source (4). The first switch (132) conducts and cuts off the electric circuit (11) between the power system (2) and the plurality of outlets (3) according to the closed state and the open state. The power relay device (1) includes an open / close detection unit (25) and a power supply control unit (32). The open / close detection unit (25) detects whether or not the first switch (132) is in the open state. When the open / close detection unit (25) detects that the first switch (132) is in the open state, the power supply control unit (32) uses one power source from the output unit (4a) of the distributed power source (4). Output to the outlet (3a).

According to this configuration, by relaying the output unit (4a) of the distributed power source (4) and the outlet (3a) of one of the plurality of outlets (3), one of the plurality of outlets (3) can be relayed. Power from the distributed power source (4) can be supplied to the other outlet (3b). Therefore, power from the distributed power source (4) can be supplied to the system distribution system (10) of the building without requiring construction work (that is, in an inexpensive configuration). Further, since the power from the distributed power source (4) is output to one outlet (3a) in the closed state of the first switch (132), the power from the distributed power source (4) is transferred to the power system (2). It is possible to prevent the reverse tide. From the above, it is possible to supply the electric power from the distributed power source (4) to the system distribution system (10) of the building with an inexpensive configuration and prevent the back tide to the electric power system (2).

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

According to this configuration, in order to prevent the back tide of the electric power from the distributed power source (4) to the power system (2), the main breaker or smart meter installed in the building as the first switch (132). The switch inside can be controlled.

The power relay device (1) of the third aspect further includes a second switch (24) in the first or second aspect. The second switch (24) conducts and cuts off the electric line (23) between the distributed power source (4) and one outlet (3a) according to the closed state and the open state. The power supply control unit (32) controls the opening and closing of the second switch (24) to control the output of electric power from the output unit (4a) of the distributed power source (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 unit (4a) of the distributed power source (4) to one outlet (3a). ..

The power relay device (1) of the fourth aspect further includes a cutoff control unit (32) in any one of the first to third aspects. The cutoff control unit (32) controls the first switch (132) so that when the first switch (132) is manually switched from the open state to the closed state, the first switch (132) is changed from the closed state to the open state.

According to this configuration, when the power from the distributed power source (4) is output to one outlet (3a) and the first switch (132) is manually switched from the open state to the closed state, The cutoff control unit (32) controls the first switch (132) from the closed state to the open state. Therefore, it is possible to prevent the electric power from the distributed power source (4) from flowing back to the electric power system (2).

In the power relay device (1) of the fifth aspect, in the fourth aspect, the first switch (132) leaks the current flowing through the electric circuit (11, 23) passing through the first switch (132). When detected, it has a function of switching from the closed state to the open state. The cutoff control unit (32) causes the first switch (132) to change from the closed state to the open state by quasi-leaking a current flowing through the electric circuit (11, 23) passing through the first switch (132). To control.

According to this configuration, by using the leakage cutoff function of the first switch (132) (the function of switching from the closed state to the open state when a leakage is detected), the power relay device (power relay device (function) can be inexpensively configured. The opening and closing of the first switch (132) can be controlled from 1).

In the power relay device (1) of the sixth aspect, in any one of the first to fifth aspects, the open / close detection unit (25) is the electric circuit (11,) via the first switch (132). Based on the continuity state of 23), it is detected whether or not the first switch (132) is in the open state.

According to this configuration, it is detected whether or not the first switch (132) is in the open state based on the continuity 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, the one outlet (3a) is a three-pole outlet (3) composed of an L-phase pole, an N-phase pole, and an E-phase pole. The open / close detection unit (25) first opens / closes based on the conduction state between the N-phase pole and the E-phase pole, or based on the continuity state between the L-phase pole and the E-phase pole. Detects whether or not the vessel (132) is in the open state.

According to this configuration, when 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 Based on the conduction state with the poles, the open / closed state of the first switch (132) can be detected with an inexpensive configuration.

In the power relay device (1) of the eighth aspect, in any one of the first to seventh aspects, the open / close detection unit (25) determines whether or not the first switch (132) is in the open state. The open / close signal indicating the above is acquired from the external device (40). The open / close detection unit (25) detects whether or not the first switch (132) is in the open state based on the acquired open / close signal.

According to this configuration, it is possible to detect whether or not the first switch (132) is in the open state based on the open / close signal acquired from the external device (40). That is, when the external device (40) detects the open / closed state of the first switch (132), whether or not the first switch (132) is in the open state is determined by using the detection result. Can be detected.

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

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

The power supply system of the tenth aspect includes a power relay device (1) of any one aspect of the first to ninth aspects and a distributed power source (4).

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

The power distribution system of the eleventh aspect includes the power relay device (1) of any one of the first to ninth aspects and the system power distribution system (10). The grid distribution system (10) distributes the power supplied from the power system (2) to the plurality of outlets (3) via the first switch (132). The first switch (132) conducts and cuts off the electric circuit (11) between the power system (2) and the plurality of outlets (3) according to the closed state and the open state.

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 system distribution system 11,23 Main electric line (electric line)
20 Input plug 21 Output plug 24 Electromagnetic switch (second switch, relay side switch)
25 Continuity detection unit (open / close detection unit)
27 Connection detection unit 32 Control unit (cutoff control unit, power supply control unit)
40 Detector (external device)
50 Operation input unit 132 Main breaker (1st switch, system side switch)

Claims (11)

It is a power relay device that relays between one of a plurality of outlets that output power supplied from the power system via the first switch and the output unit of the distributed power source.
The first switch conducts and cuts off the electric circuit between the power system and the plurality of outlets according to the closed state and the open state.
An open / close detection unit that detects whether or not the first switch is in the open state,
When the open / close detection unit detects that the first switch is in the open state, it includes a power supply control unit that outputs power from the output unit of the distributed power source to the one outlet.
Power relay device. The electric circuit between the power system and the plurality of outlets has a plurality of branch points that branch to the plurality of outlets.
The first switch is provided on the upstream side of the plurality of branch points in the electric circuit.
The power relay device according to claim 1. A second switch that conducts and cuts off the electric circuit between the distributed power source and the one outlet according to the closed state and the open state is further provided.
The power supply control unit controls the opening and closing of the second switch to control the output of electric power from the output unit of the distributed power source to the one outlet.
The power relay device according to claim 1 or 2. Further, a cutoff control unit for controlling the first switch from the closed state to the open state when the first switch is manually switched from the open state to the closed state is provided.
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 a leakage of a current flowing through an electric circuit 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 a current flowing through the electric circuit 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 the open state based on the continuity state of the electric circuit 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 composed of an L-phase pole, an N-phase pole, and an E-phase pole.
The open / close detection unit is the first switch based on the conduction state between the N-phase pole and the E-phase pole, or based on the continuity state between the L-phase pole and the E-phase pole. Detects whether is in the open state,
The power relay device according to claim 6. The open / close detection unit acquires an open / close signal indicating whether or not the first switch is in the open state from an external device, and based on the acquired open / close signal, whether or not the first switch is in the open state. Detect
The power relay device according to any one of claims 1 to 7. It is provided with an operation input unit that receives input of opening / closing information indicating whether or not the first switch is in the open state.
The open / close detection unit detects whether or not the first switch is in the open state based on the open / close information input to the operation input unit.
The power relay device according to any one of claims 1 to 8. The power relay device according to any one of claims 1 to 9,
The distributed power source is provided.
Power system. The power relay device according to any one of claims 1 to 9 and a grid distribution system are provided.
The system distribution system distributes the electric power supplied from the electric power system to the plurality of outlets via the first switch, and the first switch is connected to the electric power system according to the closed state and the open state. Conducting and shutting off electric lines between the plurality of outlets.
Power distribution system.

Images