JP6664093B2 - Cutoff control device, cutoff control system, and distribution board - Google Patents

Description

  The present invention generally relates to a cutoff control device, a cutoff control system, and a distribution board, and more particularly to a cutoff control device that controls cutoff of power supply when a specific event occurs, a cutoff control system including the cutoff control device, and the cutoff control device The present invention relates to a distribution board used for a control system.

  2. Description of the Related Art Conventionally, when an earthquake occurs, a seismic system that senses the earthquake and shuts off a circuit of a distribution board has been provided. This type of seismic sensing system employs a system in which when a earthquake is detected, a main breaker of a distribution board is turned off to cut off a main-side circuit (main circuit), thereby stopping power supply. Therefore, when an earthquake occurs, supply of power to all loads (electric loads) connected to the plurality of branch circuits is stopped. Therefore, it is not necessary to stop the power supply immediately after the occurrence of an earthquake, such as a lighting fixture or a refrigerator, and power supply to a load that would be inconvenient if stopped has been cut off.

  On the other hand, for example, Patent Document 1 discloses a power cutoff device that cuts off a power cutoff switch of a circuit in which a current equal to or more than a predetermined current value flows when an earthquake is detected. That is, according to the technology described in Patent Document 1, the main circuit is not cut off when an earthquake occurs, but only the specific power cut-off switch that should be cut off based on the magnitude of the current value is turned on and specified. Circuit is interrupted. In particular, in the technique described in Patent Literature 1, a power cutoff switch to be cut off is selected using the magnitude of the value of the current flowing in each circuit at the moment when an earthquake is detected.

Japanese Patent No. 3818305

  By the way, in the technology described in Patent Literature 1, control means for controlling a plurality of power cutoff switches when an earthquake is detected is provided. That is, the control means needs to have a transmission function for transmitting a control signal to the power cutoff switch. Also, each power cutoff switch needs to have a receiving function for receiving a control signal from the control means. Therefore, the technology described in Patent Literature 1 has a problem that the cost is increased and the size is increased due to having such a transmission function and a reception function.

  The present invention has been made in view of the above circumstances, and when a specific event occurs, a cut-off control device, a cut-off control system, and a distribution board that can further reduce the cost and size while improving the convenience of the user. The purpose is to provide.

  An interruption control device according to one aspect of the present invention includes a switching unit and a control unit. The switching unit is configured to be able to switch between an energized state and a non-energized state of an electric circuit electrically connected to each of the plurality of branch circuits. The control unit controls the switching unit to switch to the energized state or the non-energized state. Each of the plurality of branch circuits has at least a first electric wire and a second electric wire, and an earth leakage breaker that cuts off a circuit when detecting an imbalance in current between the first electric wire and the second electric wire. The electric circuit is connected in parallel with at least a zero-phase current transformer in the earth leakage breaker. The switching unit is configured to allow a part of a current flowing through one of the first electric wire and the second electric wire to bypass the zero-phase current transformer and flow through the electric circuit during the energized state of the electric circuit. Be composed. The control unit is configured to, upon receiving a signal indicating the occurrence of a specific event, switch the electric circuit connected to a specific branch circuit of the plurality of branch circuits from the non-energized state to the energized state. Control.

  A shutoff control system according to one aspect of the present invention includes the shutoff control device, a seismic sensor, and a distribution board. The distribution board includes a plurality of earth leakage breakers and distributes power from a power line serving as a main circuit to the plurality of branch circuits. Each of the plurality of earth leakage breakers performs the circuit interruption. The specific event is an earthquake, and the seismic sensor transmits the signal indicating occurrence of the earthquake to the shutoff control device when the earthquake sensor detects the earthquake.

  The distribution board according to one aspect of the present invention is used in the shutoff control system, and further includes a cabinet that houses the plurality of earth leakage breakers.

  Advantageous Effects of Invention According to the cutoff control device, the cutoff control system, and the distribution board of the present invention, there is an advantage that it is possible to further reduce the cost and size while improving the convenience of the user when a specific event occurs. is there.

FIG. 1 is a block diagram showing a configuration of the shutoff control system according to the first embodiment of the present invention. FIG. 2 is a block diagram illustrating a configuration of the shutoff control device according to the first embodiment of the present invention. FIG. 3 is a time chart illustrating first information in the shutoff control device according to the first embodiment. FIG. 4 is a flowchart for explaining a normal operation of the shutoff control device according to the first embodiment. FIG. 5 is a flowchart for explaining the operation of the above-mentioned shutoff control device when an earthquake occurs. FIG. 6A is a waveform diagram of a current flowing in a circuit to which an electric load with a low power factor is connected, and FIG. 6B is a waveform diagram of a current flowing in a circuit to which an electric load with a high power factor is connected. FIG. 7 is a block diagram illustrating a configuration of the shutoff control device according to the second embodiment of the present invention. FIGS. 8A and 8B are graphs showing the relationship between frequency and current amplitude for explaining the cutoff control device according to the first embodiment.

(Embodiment 1)
(1.1) Overall Overview The shutoff control device 10 according to the present embodiment includes a switching unit 20 and a control unit 12, as shown in FIGS.

  The switching unit 20 is configured to be able to switch between an energized state and a non-energized state of electric circuits (first to eighth electric circuits P1 to P8) electrically connected to each of the plurality of branch circuits 4 (see FIG. 1). You.

  The control unit 12 controls the switching unit 20 to switch between the energized state and the non-energized state.

  As shown in FIG. 1, each of the plurality of branch circuits 4 cuts off the circuit when detecting at least the first wire W1 and the second wire W2 and the current imbalance between the first wire W1 and the second wire W2. And an earth leakage breaker 32. The electric circuit is connected in parallel with at least the zero-phase current transformer 32B in the earth leakage breaker 32.

  The switching unit 20 is configured such that a part of the current flowing through one of the first electric wire W1 and the second electric wire W2 flows through the electric circuit bypassing the zero-phase current transformer 32B when the electric circuit is energized. .

  When receiving the signal indicating the occurrence of the specific event (the sensor signal S1 in FIG. 1), the control unit 12 switches the electric circuit connected to the specific branch circuit 4 of the plurality of branch circuits 4 from the non-energized state to the energized state. The switching unit 20 is controlled to switch.

  Here, the “plurality of branch circuits 4” refers to, as shown in FIG. 1, power supplied from a power line 50 connected to an AC power supply such as a commercial power supply in a consumer's facility 200. This is a circuit that is branched. The “consumer facility 200” means a facility of a consumer of electric power, and examples include a house (a detached house, an apartment house), an office building, a commercial facility, a hotel, a hospital, a factory, and a school. No. The electric power referred to here may be not only electric power supplied from an electric power company such as a power company but also electric power supplied from a private power generation facility such as a photovoltaic power generation facility.

  The “specific event” is an event that is unlikely to occur on a daily basis. The specific events include a first specific event related to a disaster and a second specific event caused by the behavior of a user (resident in the case of a house) of the customer facility 200. The first specific event is an event that requires evacuation from the customer facility 200, such as a large-scale earthquake, flood damage caused by a tsunami or flood, tornado, eruption, or fire. The second specific event is an event in which a user of the customer facility 200 leaves the customer facility 200 for a certain period of time for a trip or a long-term business trip.

  According to the cutoff control device 10, the switching unit 20 causes the current flowing through one of the first electric wire W1 and the second electric wire W2 to bypass the zero-phase current transformer 32B when the electric circuit is energized. It is configured to flow through the electric circuit. That is, for example, when the first electric circuit P1 is turned on, the current flowing through the first electric wire W1 and the second electric wire W2 of the branch circuit 41 to which the first electric circuit P1 is connected (see FIG. 1, current I1, I2) is switched to be in an unbalanced state. In other words, the current imbalance is generated in a pseudo manner by switching to the energized state.

  Further, when receiving the signal indicating the occurrence of the specific event, the control unit 12 switches the electric circuit connected to the specific branch circuit 4 of the plurality of branch circuits 4 from the non-energized state to the energized state. Control. Therefore, the leakage breaker 32 of the specific branch circuit 4 to which the electric circuit is connected detects the imbalance of the pseudo-generated current, that is, the pseudo leakage state when the specific event occurs, and Circuit 4 will be shut off. That is, unlike the related art, the control unit 12 does not need to have a transmission function for transmitting a control signal or the like to the circuit breaker 32, and the circuit breaker 32 also receives the control signal from the control unit 12. It is not necessary to have a receiving function for Therefore, cost reduction and size reduction can be achieved as compared with the conventional technology.

  Further, it is not necessary to stop the power supply immediately, and the earth leakage breaker 32 is not installed in the branch circuit 4 to which the electric load 8 (lighting equipment, refrigerator, etc.) is connected which would be inconvenient if stopped. The power supply to the electric load 8 can be continued. That is, if a person (for example, a constructor) grasps such a branch circuit 4 in advance, instead of installing the earth leakage breaker 32, it is only necessary to install a wiring breaker having no zero-phase current transformer, This kind of power supply to the electric load 8 can be continued when a specific event occurs. Therefore, the convenience for the user can be improved.

  It is preferable that the shutoff control device 10 further includes a generation unit 11, a determination unit 13, and a storage unit 14. In this case, the generation unit 11 generates the first information using the measurement results of the plurality of current sensors 31 that respectively measure the current flowing through the plurality of branch circuits 4 during a predetermined period. The determining unit 13 determines whether or not each of the plurality of branch circuits 4 should be cut off when a specific event occurs, based on the first information, in order to determine the specific branch circuit 4. The storage unit 14 stores the second information that is the result of the determination by the determination unit 13. When the control unit 12 receives the signal indicating the occurrence of the specific event, the control unit 12 energizes the electric circuit connected to the specific branch circuit 4 to be cut off from the non-energized state based on the second information in the storage unit 14. The switching unit 20 is controlled to switch to the state.

  According to this configuration, in order to determine the specific branch circuit 4, the determination unit 13 determines whether or not each of the plurality of branch circuits 4 should be interrupted when the specific event occurs (the first information (current sensor 31). Further, when receiving the signal indicating the occurrence of the specific event, the control unit 12 controls the switching unit 20 based on the second information in the storage unit 14 so as to switch the target electric circuit from the non-energized state to the energized state. I do. That is, the determination unit 13 does not determine the branch circuit 4 to stop supplying power after receiving the signal indicating the occurrence of the specific event, but performs the determination in advance. When the control unit 12 receives a signal indicating the occurrence of the specific event, the control unit 12 energizes the target electric circuit from the non-energized state according to the second information (determination result) stored in the storage unit 14 in advance. Only the switching unit 20 is controlled to switch to the state.

  Therefore, the selection accuracy of the specific branch circuit 4 to be interrupted is improved compared to the conventional technology in which the specific power shutoff switch to be interrupted is determined using the current value of the current at the moment when the earthquake is detected. Can be done.

  Note that the “plurality of current sensors 31” are not limited to being arranged so as to measure current for all branch circuits 4 in the distribution board 3 (see FIG. 1) described later. Specifically, as shown in FIG. 1, for example, even if seven current sensors 31 are provided so as to correspond one-to-one with only seven branch circuits 4 out of eight branch circuits 4, for example. Good. That is, in the distribution board 3, the number of the current sensors 31 and the number of the branch circuits 4 do not need to match.

  In the present embodiment, the “measurement result in the predetermined period T1” is assumed to be a measurement result for one week, for example, but is not particularly limited. For example, the measurement results for one day or one month may be used.

  In the shutoff control device 10, it is preferable that the second information in the storage unit 14 be updated every time a predetermined time elapses. According to this configuration, the second information (judgment result) is updated each time a predetermined time elapses, so that the selection accuracy of the specific branch circuit 4 to be cut off can be further improved. In particular, when the electric load 8 is an electric heating appliance, for example, the resident moves the electric load 8 connected to the wall-mounted power outlet (branch circuit 4) of the living room of the customer facility 200 (house) to the bedroom, and moves the bedroom to the bedroom. To another power supply outlet (another branch circuit 4). However, the second information (judgment result) is updated each time a certain time elapses, and thus in such a case, improvement in selection accuracy can be particularly expected.

  In the present embodiment, the “certain time” is assumed to be 24 hours, but is not particularly limited. For example, when the predetermined period T1 is one week, the second information may be updated each time the same one week as the predetermined period T1 elapses.

  In the shutoff control device 10, the first information is preferably an effective current value. According to this configuration, even when the storage unit 14 stores not only the second information but also the first information for a long time (for example, one week) due to the fact that the data amount of the effective current value is relatively small. In addition, a large-capacity storage unit 14 is not required, and the cost of the storage unit 14 can be reduced. Further, since the generation unit 11 can generate the first information using only the measurement result of the current sensor 31, the cutoff control device 10 does not need to have a complicated calculation function, and the cost of the entire device is reduced. It can be further suppressed.

  In the shutoff control device 10, the first information is a power factor, and the determining unit 13 determines whether each of the plurality of branch circuits 4 has a specific event based on whether the power factor is within a predetermined range. It is preferable to determine whether or not to shut off when it occurs. According to this configuration, when the electric load 8 is an electric heater (for example, including an electric heater, an electric iron, an electric stove, and the like), the selection accuracy can be further improved. In this case, it is preferable that the cutoff control device 10 or the external device (the measurement unit 6 described later) has a function of detecting the voltage value in addition to the current value obtained from the current sensor 31 and calculating the power factor. .

  In the cutoff control device 10, the leakage breaker 32 of the specific branch circuit 4 detects a current imbalance between the first electric wire W1 and the second electric wire W2 caused by switching to the energized state, and cuts off the circuit. Is preferably stopped. According to this configuration, the supply of power to the electric load 8 connected to the target branch circuit 4 can be stopped.

  As shown in FIG. 1, a shutoff control system 1 according to the present embodiment includes a shutoff control device 10, a seismic sensor 2, and a distribution board 3. The distribution board 3 includes a plurality of earth leakage breakers 32, and distributes power from a power line (conductor 36) serving as a main circuit to the plurality of branch circuits 4. Each of the plurality of earth leakage breakers 32 performs the above circuit interruption. The specific event is an earthquake, and the seismic sensor 2 transmits a signal (sensor signal S <b> 1) indicating occurrence of the earthquake to the shutoff control device 10 when detecting the earthquake.

  According to the shutoff control system 1, an earthquake can be detected by the seismic sensor 2, and when an earthquake occurs, a pseudo earth leakage state is generated to cut off the (branch) earth leakage breaker 32 of the distribution board 3. The operation can be performed, and the power supply can be stopped for each branch circuit 4. In addition, since each branch circuit 4 has the earth leakage breaker 32, a normal earth leakage can be detected for each branch circuit 4 in addition to the earth leakage simulated when an earthquake occurs. In addition, by providing the cutoff control device 10, the convenience of the user can be improved, and the cost can be reduced and the size can be reduced.

  Note that "detecting an earthquake" means detecting an earthquake having a predetermined seismic intensity (for example, seismic intensity 5) or more.

  As shown in FIG. 1, the distribution board 3 according to the present embodiment is used in the cutoff control system 1 and further includes a cabinet 33 that stores a plurality of earth leakage breakers 32. According to the distribution board 3, the convenience for the user can be improved, and the distribution board 3 can be provided as a distribution board for the cutoff control system 1, which can reduce the cost and the size.

(1.2) Detailed Description (1.2.1) Overall Configuration Hereinafter, the shutoff control system 1 according to the present embodiment will be described in detail. However, the configuration described below is merely an example, and the present invention is not limited to the following embodiment. Even in other embodiments, the design may be made without departing from the technical idea of the present disclosure. Various changes can be made according to the above.

  As shown in FIG. 1, the shutoff control system 1 according to the present embodiment includes, for example, a shutoff control device 10, a seismic sensor 2, and a distribution board 3 provided in a customer facility 200 (for electric power). Further, the shutoff control system 1 includes a display terminal 9 (see FIG. 2). The following description is based on the assumption that the customer facility 200 is a detached house. Therefore, the user may be called a resident. However, as described above, the customer facility 200 may be an apartment house, an office building, a commercial facility, a hotel, a hospital, a factory, a school, or the like. The configuration of the shutoff control device 10 will be described in detail in the following section “(1.2.2) Configuration of shutoff control device”.

  As shown in FIG. 1, the distribution board 3 includes a main-side switch (hereinafter, a main-side switch) 35, a plurality of branch earth leakage breakers 321 to 327 (hereinafter, earth leakage breakers 321 to 327), The first and second sensor units 37 and 38, the conductor 36, and the cabinet 33 are provided. Further, the distribution board 3 includes a normal wiring circuit breaker 39 having no zero-phase current transformer, and the measurement unit 6. The cabinet 33 includes a main switch 35, a plurality of earth leakage breakers 321 to 327, a wiring breaker 39, first and second sensor units 37 and 38, a conductor 36, a measurement unit 6, To store. Although FIG. 1 shows a configuration in which the shutoff control device 10 and the seismic sensor 2 are also housed in the cabinet 33 of the distribution board 3, the present invention is not limited to this. That is, one or both of the cutoff control device 10 and the seismic sensor 2 may be installed outside the cabinet 33.

  For example, in the case of a single-phase three-wire distribution system, the distribution board 3 includes a first voltage line (L1 phase) 51, a second voltage line (L2 phase) 52, and a neutral line (N-phase) as shown in FIG. ) 53 are electrically connected to the power line 50. Specifically, a power line 50 electrically connected to an AC power supply (not shown) such as a commercial power supply is electrically connected to a primary terminal of the main switch 35. A conductor 36 serving as a main circuit is electrically connected to a secondary terminal of the main switch 35.

  Here, the conductor 36 is constituted by a three-pole first conductive bar (L1 phase) 361, a second conductive bar (L2 phase) 362, and a third conductive bar (N phase) 363. Each conductive bar is formed of a metal plate formed in a belt shape. The first conductive bar 361, the second conductive bar 362, and the third conductive bar 363 are electrically connected to the first voltage line 51, the second voltage line 52, and the neutral line 53, respectively.

  The distribution board 3 distributes the AC power from the conductor 36 to a plurality (eight in this embodiment) of branch circuits 41 to 48. In the following, when the plurality of branch circuits 41 to 48 are not particularly distinguished, each of the plurality of branch circuits 41 to 48 is also referred to as “branch circuit 4”.

  The branch circuits 41 to 47 have earth leakage breakers 321 to 327, respectively. The branch circuit 48 has a circuit breaker 39 for wiring. Further, each branch circuit 4 has at least two first electric wires W1 and second electric wires W2. Specifically, each first electric wire W1 of each of the branch circuits 41 to 44 is electrically connected to a first conductive bar (L1 phase) 361, and each second electric wire W2 of each of the branch circuits 41 to 44 is It is electrically connected to three conductive bars (N-phase) 363. On the other hand, each first electric wire W1 of each of the branch circuits 45 to 48 is electrically connected to the second conductive bar (L2 phase) 362, and each second electric wire W2 of each of the branch circuits 45 to 48 is connected to the third conductive bar. (N-phase) 363.

  That is, assuming that the voltage between the first voltage line 51 or the second voltage line 52 and the neutral line 53 is 100 [V] (effective value), each of the branch circuits 41 to 48 has 100 [V]. V] is applied.

  In the present embodiment, as an example, as shown in FIG. 1, a plurality of branch circuits 41 to 48 are provided with a plurality of electric loads 81 to 88 via a wall-mounted power outlet (not shown) or directly. Each is connected one-to-one. In addition, some of the plurality of electric loads 81 to 88 may be connected to the corresponding branch circuit 4 via a plug-type power outlet (tap outlet) detachably attached to a wall-mounted power outlet. Good.

  In the present embodiment, as an example, the plurality of electric loads 81 to 87 are an air conditioner, a television, a washing machine, an electric heater (including, for example, an electric heater, an electric iron, an electric stove, and the like). Further, the electric load 88 is an electric load that does not require the power supply to be stopped immediately after the occurrence of an earthquake such as a lighting fixture or a refrigerator. Hereinafter, when the plurality of electric loads 81 to 88 are not particularly distinguished, each of the plurality of electric loads 81 to 88 is also referred to as “electric load 8”.

  It is not essential for the cutoff control system 1 to connect the plurality of electric loads 81 to 88 to the plurality of branch circuits 41 to 48 in a one-to-one correspondence. For example, two or more electric loads are connected to each branch circuit 4. 8 may be connected.

  Each of the earth leakage breakers 321 to 327 and the wiring breaker 39 is inserted in the middle of the first electric wire W1 and the second electric wire W2. That is, the primary side of each breaker is electrically connected to the conductor 36 via the first wire W1 and the second wire W2, and the secondary side of each breaker is electrically connected via the first wire W1 and the second wire W2. It is electrically connected to the load 8. Further, one ends of connection lines L1 to L8 described later are connected to the first electric wires W1 on the secondary side of the earth leakage breakers 321 to 327 and the wiring breaker 39, respectively. In the following, each of the leakage breakers 321 to 327 is also referred to as “leakage breaker 32” unless the leakage breakers 321 to 327 are particularly distinguished.

  As shown in FIG. 1, each of the earth leakage breakers 32 of the present embodiment includes an earth leakage detection unit 32A and a zero-phase current transformer 32B, and detects a current imbalance between the first electric wire W1 and the second electric wire W2. Then, the circuit is cut off. Specifically, the leakage detecting unit 32A determines whether the currents I1 and I2 (see FIG. 1) flowing through the first electric wire W1 and the second electric wire W2 based on the induced current induced by the zero-phase current transformer 32B. Detect equilibrium (detect leakage). Then, when the leakage is detected, the leakage detecting unit 32A trips the tripping mechanism provided therein, and as a result, the corresponding branch circuit 4 is cut off (open). Each earth leakage breaker 32 also has a function of overcurrent protection.

  The circuit breaker 39 according to the present embodiment is a circuit breaker provided in a branch circuit of a general distribution board and having an overcurrent protection function. The reason that the circuit breaker 39 is disposed only in the branch circuit 48 is that the electric load 88 does not have to stop the power supply immediately after the occurrence of a specific event (for example, an earthquake) such as a lighting fixture or a refrigerator. On the contrary, it is an electric load that becomes inconvenient. In other words, by installing the wiring breaker 39 instead of the earth leakage breaker for the branch circuit 48 to which the electric load 88 is connected, the branch circuit 48 can be connected to the branch circuit 48 at the time of occurrence of the specific event. It is excluded from the selection of “specific branch circuit”. Not only in the branch circuit 48 but also in other branch circuits, when a person (for example, a builder) determines in advance that the stop of the power supply is not necessary immediately after the occurrence of the specific event, the earth leakage breaker may be used. Alternatively, a circuit breaker for wiring may be provided. Needless to say, the circuit breaker 39 already installed in the branch circuit 48 may be replaced with a ground fault breaker on the way.

  In FIG. 1, the upper first sensor unit 37 includes four current sensors 31, and the lower second sensor unit 38 includes three current sensors 31. Each current sensor 31 is, for example, a Rogowski coil that is formed of an air-core coil that does not use a core (coreless) and generates an output (electric signal) according to a current passing through the through-hole. The seven current sensors 31 are respectively attached to the plurality of earth leakage breakers 321 to 327 so as to measure the currents I1 flowing through the first electric wires W1 of the plurality of branch circuits 41 to 47, respectively. ing. That is, each of the current sensors 31 is installed in the middle of the first electric wire W1 between the corresponding earth leakage breaker 32 and the conductor 36.

  Note that the branch circuit 48 to which the electric load 88 such as a lighting fixture or a refrigerator is connected is not provided with a current sensor.

  The output terminals of the first and second sensor units 37 and 38 are electrically connected to the measurement unit 6, and the measurement unit 6 measures the current from the first and second sensor units 37 and 38 with the plurality of current sensors 31. The measurement result of the obtained current is obtained as an electric signal.

  As shown in FIG. 1, the measurement unit 6 includes, for example, a storage unit 60 that stores a measurement result corresponding to each current sensor 31 as history information in association with identification information of the current sensor 31. The storage unit 60 may store in advance a table indicating the correspondence between the identification information of the seven current sensors 31 and the identification information of the earth leakage breakers 321 to 327 (or the branch circuits 41 to 47). In this case, the measurement unit 6 may specify the corresponding leakage breaker 32 using the table, associate the identification information of the leakage breaker 32 with the measurement result, and store it in the storage unit 60 as history information. Good.

  The measurement unit 6 is further configured to be able to communicate with the cutoff control device 10 via the signal line 91. Then, at a predetermined time (for example, midnight every day), the measurement unit 6 measures the measurement result for a predetermined period (for example, the latest one week) and the identification information of the current sensor 31 or the earth leakage breaker 32. Is transmitted to the cutoff control device 10.

  Note that the measurement unit 6 may also have a function of calculating power consumption (instantaneous value), power consumption, and the like.

  The distribution board 3 includes a pair of current sensors (not shown) for measuring the current on the master side in addition to the current sensor 31. The pair of current sensors is, for example, a CT (Current Transformer) sensor, a Hall element, a magnetic resistance element such as a GMR (Giant Magnetic Resistances) element, or a shunt resistor, and is connected to the primary terminal of the main switch 35. The power line 50 is attached to the first voltage line 51 and the second voltage line 52. Note that the current values measured by the pair of current sensors are not used in the determination process of the shutoff control device 10 described later, and thus a specific description is omitted.

  In the present embodiment, as described above, the current sensor 31 is not provided so as to correspond to all of the branch circuits 41 to 48, but is provided only in the branch circuits 41 to 47 except the branch circuit 48. I have. That is, among the branch circuits 41 to 48, a person (for example, a builder) determines in advance that it is not necessary to stop the power supply simultaneously with the detection of a specific event (for example, an earthquake) without performing the determination process of the cutoff control device 10. The branch circuit 48 is not provided with a current sensor.

  In the present embodiment, description will be made assuming that the specific event is an earthquake. Therefore, the cutoff control system 1 in the illustrated example includes the seismic sensor 2. However, as described above, the specific event is an event that requires evacuation from the customer facility 200, such as inundation damage due to a large-scale tsunami / flood, tornado, eruption, and fire, in addition to the earthquake. Is also good. In this case, the cutoff control system 1 may include a fire detector or a receiving device that receives an emergency disaster bulletin from outside instead of (or in addition to) the seismic sensor 2. In addition, the specific event may be an event in which the user of the customer facility 200 leaves the customer facility 200 for a certain period of time for a reason such as a trip or a long-term business trip. In this case, the cutoff control system 1 may include a human sensor instead of (or in addition to) the seismic sensor 2.

  The seismic sensor 2 of the present embodiment is configured to detect an earthquake having a predetermined seismic intensity (for example, seismic intensity 5) or more, and is configured to be able to communicate with the shutoff control device 10 via a signal line 92. The seismic sensor 2 includes an acceleration sensor for measuring acceleration generated by an earthquake, for example. That is, when the measurement result of the acceleration sensor becomes equal to or greater than a predetermined reference value corresponding to an earthquake having a predetermined seismic intensity, the seismic sensor 2 senses that an earthquake having a predetermined seismic intensity or higher has occurred. When the earthquake sensor 2 senses the earthquake, it transmits a sensor signal S1 (see FIGS. 1 and 2) indicating occurrence of the earthquake to the shutoff control device 10 through the signal line 92. Note that the seismic sensor 2 may be configured to transmit the sensor signal S1 to the shutoff control device 10 by wireless communication.

  In addition, the seismic sensor 2 may have a function of receiving, for example, a broadcasting station such as a radio station or an emergency earthquake early warning of the Japan Meteorological Agency distributed by a mobile phone carrier. In this case, upon receiving the emergency earthquake bulletin, the seismic sensor 2 may transmit a sensor signal S1 indicating the occurrence of an earthquake to the shutoff control device 10.

  The display terminal 9 (see FIG. 2) is a general-purpose display terminal such as a smartphone or a tablet terminal managed by a user (resident) of the customer facility 200. The display terminal 9 is configured to be able to communicate with a communication unit 17 (see FIG. 2) of the shutoff control device 10 described later via the network 7. However, when the display terminal 9 is of a type that can be attached to a wall or the like in the customer facility 200, the display terminal 9 may be configured to be able to communicate with the communication unit 17 by wire. In this case, it is desirable that the display terminal 9 is installed in a place (for example, a living room) where the resident of the customer facility 200 easily sees. Note that the cutoff control system 1 does not necessarily need to include the display terminal 9.

(1.2.2) Configuration of cutoff control device Next, the configuration of the cutoff control device 10 will be described with reference to FIGS.

  The cutoff control device 10 includes a control unit 12 and a switching unit 20, as shown in FIGS. Further, as shown in FIG. 2, the cutoff control device 10 includes a generation unit 11, a determination unit 13, a storage unit 14, a first reception unit 15, a second reception unit 16, a communication unit 17, and an operation unit 18. .

  The first receiving unit 15 measures, via the signal line 91, the measurement result of each current sensor 31 that measures the current flowing in the corresponding branch circuit 4 during a predetermined period T1 (see FIG. 3, for example, the latest one week). It is configured to be receivable from the unit 6. The first receiving unit 15 receives the identification information of the earth leakage breaker 32 or the identification information of the current sensor 31 from the measurement unit 6 in addition to the measurement result. Note that the first receiving unit 15 may be configured to be able to receive the measurement result and the identification information by wireless communication.

  The generating unit 11 generates first information using the measurement result received by the first receiving unit 15. In the present embodiment, the first information is a current effective value. That is, as shown in FIG. 3, the generation unit 11 calculates the current value (integrated value) of the current using the current (measurement result) for the predetermined period T1 (the hatched portion in FIG. 3). Then, the generation unit 11 generates data (first data) in which the current value (integrated value) in the predetermined period T1 as the first information is associated with the identification information of the corresponding earth leakage breaker 32. . The generation unit 11 repeats generation of the first data for the total number of pieces of identification information of the earth leakage breaker 32 acquired from the measurement unit 6 (or for all pieces of identification information of the current sensor 31).

  When the identification information received from the measurement unit 6 is the identification information of the current sensor 31, the storage unit 14 stores a table indicating the correspondence between the identification information of the current sensor 31 and the identification information of the earth leakage breaker 32 in advance. It is preferable to memorize. In this case, the generation unit 11 specifies the identification information of the corresponding leakage breaker 32 with reference to the table in the storage unit 14, and the identification information of the leakage breaker 32 is associated with the first information. Generate first data.

  The determination unit 13 performs a process of determining whether or not each branch circuit 4 should be shut off when an earthquake is detected, based on the first information, in order to determine the “specific branch circuit 4” (hereinafter, the following description will be given). , "Determination process"). Specifically, when the current value (integrated value) in the predetermined period T1 is equal to or greater than the predetermined reference value, the determination unit 13 pulls the tripping mechanism of the earth leakage breaker 32 associated with the current value. It is determined that removal should be performed. Then, the determination unit 13 creates second information as a determination result.

  In the present embodiment, the second information is a determination value indicating whether or not the trip should be performed. That is, when the determination unit 13 determines that the trip should be performed (the current value is equal to or more than the predetermined reference value), the determination unit 13 should not perform the trip, for example, “1”. Is smaller than the predetermined reference value), for example, “0” is set. The determination unit 13 generates data (second data) in which the identification information of the earth leakage breaker 32 of the corresponding branch circuit 4 is associated with the second information that is the determination value. Then, the determination unit 13 repeats generation of the second data by the number of first data generated by the generation unit 11.

  However, the determination unit 13 does not generate the second data only for the number of pieces of the first data generated by the generation unit 11, but generates all the circuit breakers (the earth leakage breakers 321 to 327) in the distribution board 3. And the circuit breaker 39). In this case, it is preferable that the storage unit 14 previously stores identification information of all circuit breakers in the distribution board 3. That is, there is a possibility that the current sensor is not installed as in the branch circuit 48 of the present embodiment, and the measurement result of the current for such a branch circuit 4 is not transmitted from the measurement unit 6 and the first data is Not generated. Therefore, if the determination unit 13 is configured to collectively set the determination value “0” for the circuit breaker in which the first data does not exist, the second data is applied to all the circuit breakers in the distribution board 3. Can be generated.

  Note that the determination unit 13 of the present embodiment unconditionally determines the determination value “0” for the wiring breakers other than the earth leakage breaker 32 regardless of the presence or absence of the first data (that is, the presence or absence of the current sensor 31). Generate the set second data. Alternatively, the determination unit 13 may be configured not to generate the second data for the circuit breakers other than the earth leakage breaker 32 even if the current sensor is installed and the first data exists. .

  Further, the configuration may be such that the determination value “0” (or “1”) can be manually set individually for each of the earth leakage breakers 32 through the operation unit 18 (see FIG. 2). When the determination value input in advance is stored in the storage unit 14, the determination unit 13 may generate the second data by giving priority to the determination value. However, it is desirable that the operation unit 18 does not accept the input of the determination value “1” to the circuit breaker other than the earth leakage breaker 32 or displays an error message.

  The operation unit 18 may be configured by, for example, a liquid crystal touch panel that detects an operation instruction, or may be configured by a button switch or the like.

  The storage unit 14 stores the second data generated by the determination unit 13. The storage unit 14 may store the first data generated by the generation unit 11 and the identification information of all the leakage breakers 321 to 327 and the wiring breakers 39 in the distribution board 3. The storage unit 14 may also store the determination value input in advance through the operation unit 18 and the corresponding identification information of the earth leakage breaker 32. In the present embodiment, the first information and the second information (that is, the first data and the second data) in the storage unit 14 are updated every time a predetermined time (for example, 24 hours) elapses. However, storing and updating the first information is not essential.

  As shown in FIG. 2, the second receiving unit 16 is configured to be able to receive a sensor signal S1 indicating occurrence of an earthquake from the seismic sensor 2 via a signal line 92. Note that the second receiving unit 16 may be configured to be able to receive the sensor signal S1 by wireless communication.

  As shown in FIG. 1, the switching unit 20 includes a plurality of switches (elements) 21 to 28 for closing (opening) / opening (off) the contact and a plurality of resistors R1 having a relatively high resistance value. To R8. The switches 21 to 28 according to the present embodiment are mechanical relays that mechanically open and close contacts, but are not limited thereto, and may be, for example, semiconductor relays.

  The switch 21 forms a first series circuit in a pair with the resistor R1, and the first series circuit is connected to the connection line L1. Similarly, the switches 22 to 28 form second to eighth series circuits, respectively, in pairs with the resistors R2 to R8. The second to eighth series circuits are connected to connection lines L2 to L8, respectively.

  Specifically, for example, the first end of the switch 21 is electrically connected to the first electric wire W1 of the branch circuit 41 on the secondary side of the earth leakage breaker 321 via the connection line L1, and the second end of the switch 21 is The end is electrically connected to the first end of the resistor R1. However, the connection line L1 may be connected to, for example, a circuit in the earth leakage breaker 321 as long as at least a part of the current I1 that has passed through the zero-phase current transformer 32B can be drawn to the switching unit 20 side. The second end of the resistor R1 is electrically connected to a third conductive bar (N-phase) 363 to which the second electric wire W2 of the branch circuit 41 is connected via a common line L9.

  Similarly, the first ends of the switches 22 to 27 are electrically connected to the first electric wires W1 of the branch circuits 42 to 48 on the secondary sides of the earth leakage breakers 322 to 327 via connection lines L2 to L7, respectively. Have been. However, if each of the connection lines L2 to L7 can draw at least a part of the current I1 passing through the zero-phase current transformer 32B to the switching unit 20 side, for example, each of the connection lines L2 to L7 is connected to a circuit in the earth leakage breaker 32. Is also good. The first end of the switch 28 is electrically connected to the first electric wire W1 of the branch circuit 48 on the secondary side of the circuit breaker 39 via the connection line L8. The second terminals of the switches 22 to 28 are electrically connected to the first terminals of the resistors R2 to R8, respectively. Further, the second ends of the resistors R2 to R8 are all electrically connected to the third conductive bar (N-phase) 363 to which the second electric wires W2 of the branch circuits 42 to 48 are connected via the common line L9. Have been.

  That is, an electric circuit (hereinafter, a first electric circuit) P <b> 1 composed of the connection line L <b> 1, the first series circuit, and the common line L <b> 9 is connected in parallel with the earth leakage breaker 321. Hereinafter, similarly, an electric circuit (hereinafter, referred to as a second electric circuit) P2 constituted by the connection line L2, the second series circuit, and the common line L9 is connected in parallel with the earth leakage breaker 322. An electric circuit (hereinafter, referred to as a third electric circuit) P3 constituted by the connection line L3, the third series circuit, and the common line L9 is connected in parallel with the earth leakage breaker 323. An electric circuit (hereinafter, referred to as a fourth electric circuit) P4 including the connection line L4, the fourth series circuit, and the common line L9 is connected in parallel with the earth leakage breaker 324. An electric circuit (hereinafter, a fifth electric circuit) P5 constituted by the connection line L5, the fifth series circuit, and the common line L9 is connected in parallel with the earth leakage breaker 325. An electric circuit (hereinafter, referred to as a sixth electric circuit) P6 constituted by the connection line L6, the sixth series circuit, and the common line L9 is connected in parallel with the earth leakage breaker 326. An electric circuit (hereinafter, a seventh electric circuit) P7 constituted by the connection line L7, the seventh series circuit, and the common line L9 is connected in parallel with the earth leakage breaker 327. An electric circuit (hereinafter, referred to as an eighth electric circuit) P8 including the connection line L8, the eighth series circuit, and the common line L9 is connected in parallel with the circuit breaker 39.

  As described above, the first to seventh electric paths P1 to P7 are connected in parallel with the earth leakage breakers 321 to 327, respectively. However, each electric circuit only needs to be connected in parallel with at least the zero-phase current transformer 32B in the earth leakage breaker 32.

  By turning on / off each of the switches 21 to 28, the energized state and the non-energized state of the corresponding one of the first to eighth electric circuits P1 to P8 is switched.

  Therefore, for example, when the switch 21 is turned on, a part of the current I1 flowing through the first electric wire W1 of the branch circuit 41 bypasses the earth leakage breaker 321 (that is, bypasses the zero-phase current transformer 32B) and the first current I1. The current flows through the electric circuit P1, and the first electric circuit P1 is turned on. Therefore, when the first electric circuit P1 is in the energized state, the current I1 flowing through the first electric wire W1 and the current I2 flowing through the second electric wire W2 of the branch circuit 41 are in an unbalanced state (that is, a pseudo leakage state).

  In the present embodiment, the eight first to eighth electric paths P1 to P8 are connected in parallel one-to-one to the earth leakage breakers 321 to 327 and the circuit breaker 39 as described above. The number is not particularly limited. For example, the eighth electric circuit P8 corresponding to the circuit breaker 39 may not be provided.

  In the present embodiment, the switches 21 to 28 are provided one-to-one with respect to the first to eighth electric paths P1 to P8, and the resistors R1 to R8 are also provided one-to-one. However, the number of switches and resistors is not particularly limited as long as the switching between the energized state and the non-energized state of each electric circuit is possible.

  Furthermore, in the present embodiment, the connection lines L1 to L8 are electrically connected to the first electric wires W1 of the branch circuits 41 to 48, respectively. May be connected to each other. In this case, if each of the connection lines L1 to L7 can draw at least a part of the current I2 before passing through the zero-phase current transformer 32B to the switching unit 20 side, for example, the connection lines L1 to L7 are connected to the circuit in the earth leakage breaker 32. It may be.

  The control unit 12 controls the switching unit 20 so as to switch between the energized state and the non-energized state for each of the first to eighth electric circuits P1 to P8.

  When the second receiving unit 16 receives the sensor signal S1 from the seismic sensor 2, the control unit 12 outputs the “specific branch circuit 4” of the branch circuits 41 to 48 based on the second data in the storage unit 14. Is switched from the non-energized state to the energized state.

  Specifically, upon receiving the sensor signal S1, the control unit 12 refers to the second data in the storage unit 14 and extracts the identification information of the earth leakage breaker 32 for which “1” is set as the determination value. . In the present embodiment, the branch circuit 4 having the earth leakage breaker 32 in which “1” is set as the determination value in the second data corresponds to the “specific branch circuit 4”.

  Further, the control unit 12 specifies a switch corresponding to the extracted identification information of the earth leakage breaker 32 among the switches 21 to 28. Here, the storage unit 14 stores a table in which the identification information of the earth leakage breaker 32 and the identification information of the switches 21 to 28 are associated in advance. The control unit 12 refers to the table in the storage unit 14 and specifies a switch corresponding to the extracted identification information of the earth leakage breaker 32. Hereinafter, the “leakage breaker 32 having the extracted identification information” is also simply referred to as “specific leakage breaker 32”.

  The control unit 12 controls the switching unit 20 so as to turn on the specified switch or the plurality of switches, whereby the electric circuit connected to the one or the plurality of specific branch circuits 4 is switched to the energized state. As a result, one or a plurality of specific earth leakage breakers 32 detects a simulated earth leakage state and shuts off the circuit. Hereinafter, the process of “switching to the energized state and performing circuit interruption” is also referred to as “first process”.

  When receiving the sensor signal S1, the control unit 12 may output the identification information of the specific earth leakage breaker 32 to the outside instead of the “first processing”. Hereinafter, the process of “outputting identification information to the outside” is also referred to as “second process”. In this case, it is preferable that the identification information is output to a device provided outside the shutoff control device 10 through the communication unit 17 and is notified to the surroundings by the device. This means that the identification information is notified from an external device to, for example, a resident of the customer facility 200 without immediately shutting down the circuit of the specific earth leakage breaker 32 in consideration of convenience. In the present embodiment, as shown in FIG. 2, the identification information is output to the display terminal 9 having a function of displaying a message or the like via the communication unit 17.

  Further, the control unit 12 may simultaneously perform both the “first processing” and the “second processing” for the specific earth leakage breaker 32. That is, when the control unit 12 receives the sensor signal S1, for example, the switch 21 is turned on to cause the earth leakage breaker 321 to perform circuit interruption, and at the same time, the identification information of the earth leakage breaker 321 is output to the display terminal 9. Is also good. Thereby, the resident of the customer facility 200 can recognize through the display terminal 9 that the earth leakage breaker 321 has performed the circuit interruption.

  Regarding which one of the “first processing”, “second processing”, and “both first processing and second processing” is executed for each of the earth leakage breakers 32, It is preferable that the setting can be individually made in advance by the operation unit 18. Further, the shutoff control system 1 includes a human sensor (not shown), and the control unit 12 executes any processing based on a signal received from the human sensor indicating the presence or absence of a resident of the customer facility 200. It may be configured to automatically determine whether to do so. For example, when a signal indicating absence is received from the human sensor, the control unit 12 may collectively perform only the “first processing” on all the specific earth leakage breakers 32.

  The communication unit 17 is connected to the network 7 such as the Internet via a router, for example. The communication unit 17 has a function of transmitting an output (identification information of the earth leakage breaker 32) from the control unit 12 to the display terminal 9 via the network 7. The display terminal 9 does not directly display the identification information (for example, circuit numbers 1, 2, 3,...) Of the earth leakage breaker 32, but, for example, a name corresponding to the earth leakage breaker 32 registered in advance. It is desirable to display "power outlet in living room", "air conditioner", "TV", and the like.

  As described above, the control unit 12 does not have a transmission function for transmitting a control signal or the like to the circuit breaker 32 of the branch circuit 4 unlike the related art. Further, the circuit breaker 32 of the branch circuit 4 also has no receiving function for receiving a control signal from the control unit 12. Therefore, cost reduction and size reduction can be achieved as compared with the conventional technology.

  Further, instead of some of the earth leakage breakers 321 to 327, for example, a remote control breaker having a control signal receiving function may be installed. In this case, the cutoff control device 10 needs to have a function of transmitting a control signal for opening a contact to the branch circuit 4 having the remote control breaker instead of generating a leakage state in a simulated manner. However, by installing at least one earth leakage breaker 32 in each of the branch circuits 41 to 48, it is possible to reduce the cost and the size of the distribution board 3 as a whole as compared with the related art.

  The shutdown control device 10 of the present embodiment has, for example, a microcomputer (microcomputer) as a main component, and realizes various functions by executing a program recorded in a memory of the microcomputer by a CPU (Central Processing Unit). . The program may be recorded in a memory of a microcomputer in advance, may be provided by being recorded in a recording medium such as a memory card, or may be provided through an electric communication line.

  Furthermore, at least a part of the functions of the cutoff control device 10 (for example, the function of the generation unit 11) may be realized by a computer that is distributed and exists like a cloud (cloud computing).

  Further, the function of the cutoff control device 10 of the present embodiment may be realized by a HEMS (Home Energy Management System) controller provided outside the distribution board 3.

(1.2.3) Explanation of normal operation of cutoff control device Next, a normal operation of cutoff control device 10 will be described with reference to the flowchart of FIG. The “normal operation” means an operation when the second receiving unit 16 does not receive the sensor signal S1 from the seismic sensor 2.

  First, when the first receiving unit 15 receives a measurement result in the predetermined period T1 from the measurement unit 6 (step ST1), the generation unit 11 uses the measurement result to generate all the data corresponding to the plurality of current sensors 31 respectively. Is generated (step ST2). Further, the generation unit 11 repeatedly generates the first data in which the identification information of the earth leakage breaker 32 is associated with the first information for the total number of pieces of the identification information of the earth leakage breaker 32 acquired from the measurement unit 6.

  Then, the determination unit 13 determines whether the first information in each first data, that is, the current value in the predetermined period T1 is equal to or more than a predetermined reference value (step ST3). When the current value is equal to or more than the predetermined reference value (step ST3: YES), the determination unit 13 determines that the earth leakage breaker 32 should perform the tripping of the tripping mechanism (should perform the circuit interruption) and performs the second operation. "1" is set to the determination value as the information (step ST4). On the other hand, when the current value is less than the predetermined reference value (step ST3: NO), the determination unit 13 determines that the circuit should not be interrupted, and sets “0” as the determination value as the second information. (Step ST5). This determination process (step ST3) is repeatedly performed for each first data.

  Then, the determination value (second information) in which “1” or “0” is set is stored in the storage unit 14 as second data in association with the identification information of the earth leakage breaker 32 (step ST6). . Thereafter, the process returns to the beginning, and after a lapse of a predetermined time (for example, 24 hours), the first receiving unit 15 receives the measurement result in the predetermined period T1 from the measurement unit 6 again (step ST1).

  Here, in the related art, it is determined whether or not each cutoff switch should be cut off after receiving a sensor signal from the seismic sensor. That is, the cutoff switch is selected by comparing the current value of the current flowing in the circuit at the moment when the earthquake occurs with the predetermined current value. However, as shown in FIG. 3, for example, depending on the type of the electric load 8, even when the current value exceeds a predetermined current value in a normal operation, the current value is not increased when the sensor signal S1 is output from the seismic sensor. May be accidentally low. In the related art, there is a fear that the power supply to the electric load 8 is not stopped.

  On the other hand, unlike the related art, the cutoff control device 10 of the present embodiment uses the measurement result in the predetermined period T1 when the sensor signal S1 is not received, and the earth leakage breaker 32 A determination is made as to whether or not to shut off. That is, the processing of steps ST1 to ST6 described above is not performed with the reception of the sensor signal S1 as a trigger, but is performed periodically regardless of whether or not an earthquake has occurred. Therefore, as shown in FIG. 3, even when the sensor value S1 is output, the leakage current breaker 32 that should cut off the circuit can be provided with higher accuracy even for the electric load 8 whose current value may be accidentally reduced. Can be selected.

  In particular, in the present embodiment, since the first information is the current effective value (integrated value) for the predetermined period T1, the accuracy of the determination process (step ST3) can be further improved. Further, even when the storage unit 14 stores the first information for a long period of time (for example, one week) due to the fact that the data amount of the current effective value is relatively small, the storage unit 14 does not need a large-capacity storage unit. Thus, the cost of the storage unit 14 can be reduced.

(1.2.4) Description of Operation of Interruption Control Apparatus When Earthquake Occurs Next, operation of the interruption control apparatus 10 when an earthquake occurs will be described with reference to the flowchart in FIG.

  In the following description of the operation, as an example, regarding the second data in the storage unit 14, “1” is set as the determination value of the leakage breakers 321 to 324, and “0” is set as the determination value of the leakage breakers 325 to 327. Is set. In addition, since the circuit breaker 39 for wiring is not an earth leakage breaker, "0" is set to the determination value unconditionally as described above.

  First, when the seismic sensor 2 detects an earthquake of a predetermined seismic intensity (for example, seismic intensity 5) or more, or when an emergency earthquake early warning of the Meteorological Agency is received, the second receiving unit 16 of the shutoff control device 10 The sensor signal S1 is received (step ST11). Then, the control unit 12 reads the determination value (second information) in the second data stored in the storage unit 14 with the reception of the sensor signal S1 as a trigger, and sets “1” as the determination value. Data of the earth leakage breakers 321 to 324 is extracted (step ST12).

  Then, control unit 12 determines which of “first processing” and “second processing” is to be performed on each of leakage breakers 321 to 324 (step ST13). Although not shown in the flowchart of FIG. 5, “execute both the first process and the second process” may be included as one of the options.

  For example, when determining the leakage breakers 321 to 323 among the leakage breakers 321 to 324 as targets of the “first processing”, the control unit 12 refers to the table in the storage unit 14 and The switches 21 to 23 corresponding to H.323 are specified. Then, the control unit 12 controls the switching unit 20 to turn on the specific switches 21 to 23 (step ST14). As a result, the first to third electric circuits P1 to P3 connected to the specific branch circuits 41 to 43 are switched to the energized state. The earth leakage breakers 321 to 323 detect the earth leakage state generated simulated by the above-mentioned energized state, and shut off the specific branch circuits 41 to 43 in order to stop the power supply to the electric loads 81 to 83, respectively. (Step ST15).

  Note that the control unit 12 turns off the specific switches 21 to 23 and turns the first to third electric circuits P1 to P3 back to the original non-energized state when a predetermined time has elapsed after turning on the specific switches 21 to 23. .

  Further, for example, when the control unit 12 determines to execute the “second processing” for the leakage breaker 324 among the leakage breakers 321 to 324, the identification information of the leakage breaker 324 is displayed via the communication unit 17. It transmits to terminal 9 (step ST16). After the occurrence of the earthquake, the resident of the customer facility 200 determines, through a message or the like displayed on the display terminal 9, that the cutoff control device 10 has determined that it is desirable to stop the power supply (although the power supply has not been stopped). The circuit 44 can be grasped. The resident of the customer facility 200 that has confirmed the message may take appropriate action based on his / her own judgment (for example, turn off the power of the electric device 84 connected to the corresponding branch circuit 44).

  As described above, unlike the related art, the cutoff control device 10 of the present embodiment does not perform the process of determining whether to cut off the circuit when an earthquake occurs. That is, when an earthquake occurs, the cutoff control device 10 only switches between the energized state and the non-energized state of each electric circuit or transmits the identification information based on the determination value (second information) stored in advance. .

(1.3) Effects According to the shutoff control device 10 of the present embodiment described above, unlike the related art, the control unit 12 needs to have a transmission function for transmitting a control signal or the like to the breaker 32. In addition, the circuit breaker 32 does not need to have a receiving function for receiving a control signal from the control unit 12. Therefore, cost reduction and size reduction can be achieved as compared with the conventional technology.

  Further, it is not necessary to stop the power supply immediately, and the earth leakage breaker 32 is not installed in the branch circuit 4 to which the electric load 8 (lighting equipment, refrigerator, etc.) is connected which would be inconvenient if stopped. The power supply to the electric load 8 can be continued. In other words, if a person (for example, a constructor) grasps such a branch circuit 4 in advance, a normal circuit breaker (without a zero-phase current transformer) is installed instead of the earth leakage breaker 32. Only when a specific event occurs, power supply to this kind of electric load 8 can be continued. Therefore, the convenience for the user can be improved.

  Further, according to the cutoff control system 1 according to the present embodiment, the earthquake can be detected by the seismic sensor 2, and when an earthquake occurs, a pseudo-leakage state is generated so that the distribution board 3 (branch). It is possible to cause the earth leakage breaker 32 to perform a breaking operation, and to stop power supply in the branch circuit 4 unit. In addition, since each branch circuit 4 has the earth leakage breaker 32, a normal earth leakage can be detected for each branch circuit 4 in addition to the earth leakage simulated when an earthquake occurs. In addition, by providing the cutoff control device 10, the convenience of the user can be improved, and the cost can be reduced and the size can be reduced.

  Further, according to the distribution board 3 according to the present embodiment, it is provided as a distribution board for the cutoff control system 1 which can improve the convenience of the user and can reduce the cost and the size. can do.

(1.4) Modification 1
Hereinafter, a first modification of the shutoff control system 1 according to the first embodiment will be described with reference to FIGS. 6A and 6B.

  In the first embodiment (hereinafter, referred to as a basic example), the first information is the current effective value (integrated value). On the other hand, this modified example is different from the basic example of the first embodiment in that the first information is the power factor.

  FIG. 6A shows a waveform diagram of current and voltage in a case where the electric load 8 is a lighting device that has an LED (Light-Emitting diode) as a light source and is capable of dimming lighting control. As can be seen from FIG. 6A, the electric load 8 of this type has a relatively large phase difference between the voltage and the current because the current (waveform C2) is later than the voltage (waveform C1). Therefore, when the electric load 8 is a lighting fixture or the like, the power factor measured by the corresponding branch circuit 4 is expected to be low.

  On the other hand, FIG. 6B shows a waveform diagram of current and voltage when the electric load 8 is an electric heater (for example, including an electric heater, an electric iron, an electric stove, and the like). As can be seen from FIG. 6B, in this type of electric load 8, the current (waveform C4) hardly lags the voltage (waveform C3) (substantially coincides in FIG. 6B), and the phase difference between the voltage and the current is small. Very small. Therefore, when the electric load 8 is an electric heater, the power factor measured by the corresponding branch circuit 4 is expected to be high.

  By the way, when an electric heater such as an electric heater is overturned due to, for example, an earthquake, a fire may occur. In recent years, electric loads that have the function of automatically turning off the power when a fall has become widespread, but this can be prevented by taking into account that surrounding objects may fall on the electric heater or the curtain may come into contact with it. In some cases, it cannot be done. Therefore, in the event of an earthquake, it is desired to cause the earth leakage breaker 32 corresponding to the branch circuit 4 to which the electric heater is connected to cut off the circuit in order to stop the power supply to the electric heater.

  Therefore, in the present modification, the generator 11 of the cutoff control device 10 calculates the power factor (first information) using the measurement result in the predetermined period T1, that is, using the voltage value in addition to the current value. The determination unit 13 of the cutoff control device 10 determines whether the plurality of branch circuits 4 are based on whether the power factor (first information) is within a predetermined range (for example, within a range of 0.8 to 0.9). Are to be shut down when a particular event (such as an earthquake) occurs. Specifically, when the power factor is within a predetermined range, it is determined that the tripping mechanism of the earth leakage breaker 32 should be tripped, and the determination value is set to, for example, “1”. If it is out of the range, it is determined that the trip should not be performed, and the determination value is set to, for example, “0”.

  In this case, at a predetermined time (for example, midnight every day), the measuring unit 6 applies the voltage value in addition to the current value for the predetermined period T1 (the latest one week) to the current sensor 31 (or the earth leakage). This is transmitted to the first receiving unit 15 of the cutoff control device 10 together with the identification information of the circuit breaker 32).

  Note that other components and operations are the same as those in the basic example of the first embodiment, and a description thereof will not be repeated.

  According to the configuration of the first modification described above, when the electric load 8 is an electric heater, the selection accuracy of the specific branch circuit 4 to be cut off can be further improved. In particular, in the basic example of the first embodiment, the branch circuit 48 to which the electric load 88 such as a lighting fixture is connected is not provided with the earth leakage breaker and the current sensor in advance in order to exclude from the target of the power supply stop. . However, in the present modified example, even if the earth leakage breaker and the current sensor are installed in the branch circuit 48, there is a high possibility that the branch circuit 48 is excluded from the target of the power supply stop in the determination processing by the determination unit 13. .

  Note that the determination unit 13 of the cutoff control device 10 uses each of the effective current value (integrated value) of the basic example and the power factor of the modified example 1 as the first information, It may be configured to determine whether or not to be shut off when an (e.g., earthquake) occurs. In this case, the accuracy of selecting a specific branch circuit 4 to be cut off can be further improved.

(1.5) Modification 2
Hereinafter, a second modification of the shutoff control system 1 of the first embodiment will be described.

  In the basic example and the first modification of the first embodiment, the cutoff control device 10 acquires the measurement result of the current sensor 31 in the predetermined period T1 via the measurement unit 6. That is, the measurement result in the predetermined period T1 was stored in the storage unit 60 of the measurement unit 6.

  On the other hand, in the present modification, the cutoff control device 10 is directly electrically connected to the first sensor unit 37 and the second sensor unit 38, and the storage unit 14 stores the measurement result in the predetermined period T1. Note that other components and operations are the same as those in the basic example or the first modification of the first embodiment, and thus description thereof is omitted.

  According to the configuration of Modification 2 described above, the number of components as the entire cutoff control system 1 can be reduced, and the wiring in the cabinet 33 of the distribution board 3 can be simplified.

(Embodiment 2)
(2.1) Overall Configuration Hereinafter, a shutoff control system 1 according to the second embodiment will be described with reference to FIGS. 7, 8A, and 8B. Note that the same components as those of the first embodiment are denoted by the same reference numerals, and description thereof will not be repeated.

  The cutoff control device 10A of the present embodiment is different from the cutoff control device 10 of the first embodiment in that the first information is the characteristic amount of the current waveform. Further, the determination unit 13 of the present embodiment estimates the type of the electric load 8 connected to the plurality of branch circuits 4 based on the characteristic amount of the current waveform, and determines each of the plurality of branch circuits 4 based on the estimation result. This is different from the determination unit 13 of the first embodiment in that it is determined whether or not to be shut off when a specific event occurs. That is, the determination unit 13 of the present embodiment includes an estimation unit 130 as shown in FIG.

(2.2) Configuration of Cutoff Control Device Hereinafter, the configuration of the cutoff control device 10A of the present embodiment will be specifically described.

  The generation unit 11 of the cutoff control device 10A generates first information using the measurement result received by the first reception unit 15. Then, in the present embodiment, the first information is the characteristic amount of the current waveform. That is, the generation unit 11 calculates the characteristic amount of the current waveform using the current (measurement result) for the predetermined period T1. Specifically, the generation unit 11 first decomposes (Fourier transforms) the current waveform in the predetermined period T1 into frequency components.

  Here, FIG. 8A is an example of a graph showing the relationship between frequency and current amplitude, obtained by decomposing a current waveform into a frequency component in a lighting fixture in which the electric load 8 has an LED and is capable of dimming lighting control. is there. FIG. 8B shows the relationship between the frequency and the amplitude of the current obtained by the electric load 8 decomposing the current waveform in an electric heater (including an electric heater, an electric iron, an electric stove, etc.) into frequency components. It is an example of a graph. From FIGS. 8A and 8B, it can be seen that the magnitude (amplitude) of the current value of the second-order or higher harmonic component (on the right side of the dotted line in the figure) differs significantly between the lighting fixture and the electric heater.

  From this viewpoint, the generation unit 11 calculates, for example, the total value of the magnitudes (amplitudes) of the current values of the second or higher harmonic components as the first information. Then, the generation unit 11 generates first data in which the total value as the first information is associated with the identification information of the earth leakage breaker 32.

  The determination unit 13 performs a process of determining whether each of the plurality of branch circuits 4 should be shut off when a specific event (for example, an earthquake) occurs based on the first information (“determination process”).

  Specifically, first, the estimating unit 130 of the determining unit 13 sets the type of the electric load 8 connected to the branch circuit 4 to the first type when the total value in the predetermined period is equal to or more than the predetermined threshold. presume. Further, the estimating unit 130 of the determining unit 13 estimates the type of the electric load 8 connected to the branch circuit 4 as the second type when the total value in the predetermined period is less than the predetermined threshold.

  In the present embodiment, the first type of electric load 8 corresponds to a lighting fixture, and the second type of electric load 8 corresponds to an electric heater. However, the threshold value is not limited to two types (the first type and the second type), and the threshold value may be set in a plurality of stages so that three or more types of electric loads can be estimated.

  Here, the storage unit 14 of the present embodiment stores in advance a table indicating a determination value corresponding to the first type of electrical load 8 and a determination value corresponding to the second type of electrical load 8. In the table of the present embodiment, “0” indicating that the tripping mechanism of the earth leakage breaker 32 should not be tripped is set to the determination value of the first type electric load 8 (lighting fixture), The determination value of the second type of electric load 8 (electric heater) is set to “1” indicating that tripping should be performed. The change of the determination value in the table can be set, for example, through the operation unit 18.

  Then, when the estimation result of the estimation unit 130 is “first type”, the determination unit 13 determines the determination value “0” corresponding to “first type” in the table stored in the storage unit 14. Is set to the determination value (second information) of the earth leakage breaker 32. When the estimation result of the estimation unit 130 is “second type”, the determination unit 13 determines the determination value “1” corresponding to “second type” in the table stored in the storage unit 14. Is set to the determination value (second information) of the earth leakage breaker 32. The determination unit 13 generates second data in which the identification information of the earth leakage breaker 32 is associated with the second information that is the determination value.

  Note that other components and operations are the same as those in the first embodiment, and a description thereof will not be repeated.

(2.3) Effects According to the shutoff control device 10A of the present embodiment described above, the accuracy of selecting a specific branch circuit 4 to be shutoff can be further improved. In particular, in the basic example of the first embodiment, the branch circuit 48 to which the electric load 88 such as a lighting fixture is connected is not provided with the earth leakage breaker and the current sensor in advance in order to exclude the branch circuit from the target of the power supply stop. However, in the present embodiment, even if the earth leakage breaker and the current sensor are installed in the branch circuit 48, there is a high possibility that the branch circuit 48 is excluded from the target of the power supply stop by the estimation of the estimating unit 130.

DESCRIPTION OF SYMBOLS 1 Shut-off control system 2 Seismic sensor 3 Distribution board 4, 41-48 Branch circuit 10, 10A Shut-off control device 11 Generation part 12 Control part 13 Judgment part 14 Storage part 20 Switching part 31 Current sensor 32, 321-327 Leakage cutoff Container 33 Cabinet 36 Conductor (Main circuit)
P1 to P8 First to eighth electric circuits (electric circuits)
S1 Sensor signal (signal)
T1 Predetermined period W1 First wire W2 Second wire

Claims (9)

A switching unit configured to be able to switch between a conducting state and a non-conducting state of an electric circuit electrically connected to each of the plurality of branch circuits; and controlling the switching unit to switch to the conducting state or the non-conducting state. A control unit;
With
Each of the plurality of branch circuits has at least a first electric wire and a second electric wire, and an earth leakage breaker that cuts off a circuit when detecting an imbalance in current between the first electric wire and the second electric wire,
The electric circuit is connected in parallel with at least a zero-phase current transformer in the earth leakage breaker,
The switching unit is configured to allow a part of a current flowing through one of the first electric wire and the second electric wire to bypass the zero-phase current transformer and flow through the electric circuit during the energized state of the electric circuit. Composed,
The control unit is configured to, upon receiving a signal indicating the occurrence of a specific event, switch the electric circuit connected to a specific branch circuit of the plurality of branch circuits from the non-energized state to the energized state. A shutoff control device characterized by controlling the following. A generation unit configured to generate first information using a measurement result in a predetermined period of a plurality of current sensors that respectively measure currents flowing through the plurality of branch circuits;
A determining unit that determines whether or not each of the plurality of branch circuits should be interrupted when the specific event occurs, based on the first information, in order to determine the specific branch circuit;
A storage unit that stores second information that is a determination result of the determination unit;
Further comprising
When the control unit receives the signal indicating the occurrence of the specific event, the control unit de-energizes the electric circuit connected to the specific branch circuit to be interrupted based on the second information in the storage unit. The shutoff control device according to claim 1, wherein the switching unit is controlled so as to switch from a state to the energized state. The shutoff control device according to claim 2, wherein the second information in the storage unit is updated every time a predetermined time elapses. The cutoff control device according to claim 2, wherein the first information is a current effective value. The first information is a power factor,
The determination unit determines whether or not each of the plurality of branch circuits should be interrupted when the specific event occurs, based on whether or not the power factor is within a predetermined range. The shutoff control device according to any one of claims 2 to 4. The first information is a characteristic amount of a current waveform,
The determining unit estimates a type of an electric load connected to the plurality of branch circuits based on the characteristic amount of the current waveform, and based on the estimation result, each of the plurality of branch circuits generates the specific event. To determine if it should be interrupted ,
The characteristic amount of the current waveform is a total value of magnitudes of current values of second-order or higher harmonic components in the predetermined period. Shut-off control device. The leakage breaker of the specific branch circuit, when detecting an imbalance in current between the first electric wire and the second electric wire caused by switching to the energized state, interrupts the circuit and stops power supply. The shutoff control device according to any one of claims 1 to 6, wherein: An interruption control device according to any one of claims 1 to 7,
A seismic sensor,
A distribution board that includes a plurality of earth leakage breakers and distributes power from a power line serving as a main circuit to the plurality of branch circuits.
With
Each of the plurality of earth leakage breakers performs the circuit interruption,
The specific event is an earthquake,
When the seismic sensor detects an earthquake, the seismic sensor transmits the signal indicating occurrence of the earthquake to the shutoff control device. Used in the shut-off control system according to claim 8,
The distribution board further includes a cabinet that houses the plurality of earth leakage breakers.

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