Anomaly detection system, distribution board, anomaly detection method, and program

Abstract

To facilitate detection of a wiring abnormality in wiring.SOLUTION: An abnormality detection system 100 comprises an acquisition unit 711 and a detection unit 712. The acquisition unit 711 acquires voltage information related to a voltage applied to a circuit C1 connected with a panel board 1. The detection unit 712 detects a wiring abnormality in wiring C11 in the circuit C1 on the basis of the voltage information acquired by the acquisition unit 711. The detection unit 712 has a plurality of determination functions including a first determination function and a second determination function. The first determination function is a function to determine occurrence of the wiring abnormality when the voltage information exceeds a threshold. The second determination function is a function to determine whether the wiring abnormality occurs using a determination method different from the first determination function. In the second determination function, the detection unit 712 compares the voltage information with a plurality of thresholds to determine whether the wiring abnormality occurs, and determines whether the wiring abnormality occurs in different conditions for the individual thresholds.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure generally relates to an anomaly detection system, a distribution board, an anomaly detection method, and a program. More specifically, the present disclosure relates to an anomaly detection system, a distribution board, an anomaly detection method, and a program that detect an anomaly in wiring included in a circuit connected to the distribution board. [Background technology]

[0002] Patent Document 1 discloses a distribution board in which a main switch and multiple branch switches are housed as internal devices inside a cabinet. The main switch and the branch switches each have a leakage current protection function. When the leakage current protection function of the main switch and the branch switch detects a leakage current, the contacts are forcibly opened to protect the circuit. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2017-107833 A Summary of the Invention [Problem to be solved by the invention]

[0004] The present disclosure aims to provide an anomaly detection system, a distribution board, an anomaly detection method, and a program that make it easier to detect wiring anomalies in wiring. [Means for solving the problem]

[0005] An anomaly detection system according to an embodiment of the present disclosure includes an acquisition unit and a detection unit. The acquisition unit acquires voltage information related to a voltage applied to a circuit connected to a distribution board. The detection unit detects a wiring anomaly in wiring in the circuit based on the voltage information acquired by the acquisition unit. The detection unit has a plurality of determination functions including a first determination function and a second determination function. The first determination function is a determination function that determines whether the voltage information is First VoltageThe second determination function is a function for determining whether the wiring abnormality has occurred by a determination method different from that of the first determination function. The detection unit detects the wiring abnormality by any one of the plurality of determination functions in response to a predetermined trigger. In the second determination function, the detection unit uses the voltage information and a plurality of Second Voltage The acquiring unit further acquires current information relating to a current flowing through the circuit, the acquiring unit acquiring current information relating to a current flowing through the circuit, and determining whether or not the wiring abnormality has occurred by comparing the wiring abnormality with a threshold value and determining whether or not the wiring abnormality has occurred under a condition that differs for each threshold value. When it is determined that the wiring abnormality has occurred by the determination made by the first determination function or the determination made by the second determination function, the detection unit further determines whether or not a disconnection condition is satisfied. The detection unit detects the voltage information as 3 If the voltage threshold is exceeded and the current information exceeds a first current threshold, the voltage information 3 Voltage threshold value is greater than 4 When the voltage threshold is exceeded, and when the current information exceeds a second current threshold that is greater than the first current threshold, determining that the interruption condition is satisfied, It is determined that the circuit in which the wiring abnormality is detected is to be shut off.

[0006] A distribution board according to one aspect of the present disclosure includes the above-described anomaly detection system and a distribution board cabinet that houses the anomaly detection system.

[0007] An anomaly detection method according to one aspect of the present disclosure includes an acquisition step and a detection step. The acquisition step is a step of acquiring voltage information related to a voltage applied to a circuit connected to a distribution board. The detection step is a step of detecting a wiring anomaly in wiring in the circuit based on the voltage information acquired in the acquisition step. The detection step includes a plurality of determination steps including a first determination step and a second determination step. The first determination step is a step of detecting whether the voltage information is First VoltageThe second determination step is a step of determining whether or not the wiring abnormality has occurred by a determination method different from that of the first determination step. The detection step detects the wiring abnormality in any one of the plurality of determination steps in response to a predetermined trigger. In the second determination step, the voltage information and a plurality of Second Voltage By comparing the wiring abnormality with a threshold value, it is determined whether the wiring abnormality has occurred, and it is determined whether the wiring abnormality has occurred under a condition that differs for each threshold value. In the obtaining step, current information regarding a current flowing through the circuit is further obtained. In the detection step, when it is determined in the first determination step or in the second determination step that the wiring abnormality has occurred, it is further determined whether or not a disconnection condition is satisfied. In the detection step, the voltage information is 3 If the voltage threshold is exceeded and the current information exceeds a first current threshold, the voltage information 3 Voltage threshold value is greater than 4 When the voltage threshold is exceeded, and when the current information exceeds a second current threshold that is greater than the first current threshold, determining that the interruption condition is satisfied, It is determined that the circuit in which the wiring abnormality is detected is to be shut off.

[0008] A program according to an embodiment of the present disclosure causes one or more processors to execute the above-described anomaly detection method. Effect of the Invention

[0009] The present disclosure has an advantage in that wiring abnormalities in wiring can be easily detected. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is an explanatory diagram showing a schematic configuration of an anomaly detection system according to an embodiment of the present disclosure and a distribution board in which the anomaly detection system is used. [Diagram 2] FIG. 2 is an explanatory diagram of the distribution board as viewed from the front with the lid and cover removed. [Diagram 3] FIG. 3 is a diagram illustrating an example of a first determination function of a detection unit of the anomaly detection system. [Figure 4]FIG. 4 is a diagram illustrating an example of a second determination function of the detection unit of the anomaly detection system. [Diagram 5] FIG. 5 is a diagram illustrating an example of a second determination function of the detection unit of the anomaly detection system. [Figure 6] FIG. 6 is a diagram illustrating an example of a second determination function of the detection unit of the anomaly detection system. [Figure 7] FIG. 7 is a correlation diagram between a current flowing through a circuit referenced in a cutoff control unit of the anomaly detection system and a voltage applied to the circuit. [Figure 8] FIG. 8 is a flowchart illustrating the operation of the anomaly detection system. [Figure 9] FIG. 9 is a diagram illustrating another example of the first determination function of the detection unit of the anomaly detection system. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] (1) Overview 1, the anomaly detection system 100 of this embodiment is used to detect a wiring anomaly in a wiring C11 included in a circuit C1 connected to a distribution board 1. The anomaly detection system 100 includes an acquisition unit 711 and a detection unit 712. In this embodiment, the components of the anomaly detection system 100 are included in a monitoring unit 7 (described later) arranged inside the distribution board 1.

[0012] The acquisition unit 711 acquires voltage information related to the voltage applied to the circuit C1 connected to the distribution board 1. The "circuit connected to the distribution board" in the present disclosure may include the main breaker 3, the branch breaker 4, the seismic breaker 5, and the interconnection breaker 6 installed inside the distribution board 1. In addition, the "circuit connected to the distribution board" in the present disclosure may include the outlet 22 or the electric device 24 electrically connected to the secondary side of the branch breaker 4, or the electric device 23 directly and electrically connected to the secondary side of the branch breaker 4. Furthermore, the "circuit connected to the distribution board" in the present disclosure may include the distributed power source 21 electrically connected to the secondary side of the interconnection breaker 6. In the following, when the main breaker 3, the branch breaker 4, the seismic breaker 5, and the interconnection breaker 6 are not particularly distinguished from each other, they are referred to as "switches 2". In this embodiment, the voltage information is information related to the secondary side voltage of the main breaker 3 obtained by measuring the secondary side circuit of the main breaker 3 using a voltage measuring device.

[0013] The detection unit 712 detects a wiring abnormality in the wiring C11 in the circuit C1 based on the voltage information acquired by the acquisition unit 711. In this disclosure, the "wiring abnormality" may include abnormalities such as insulation deterioration or partial disconnection in the wiring C11 included in the circuit C1. In this disclosure, the "partial disconnection" refers to a state in which the wiring is on the verge of disconnection, and specifically, if the wiring C11 is a stranded wire, it is a state in which some of the multiple strands that make up the stranded wire are disconnected.

[0014] For example, when the wiring C11 is composed of a pair of electric wires, the wiring abnormality may include an arc (so-called parallel arc) that occurs due to a short circuit between the pair of electric wires. A parallel arc may occur, for example, when the wiring C11 gets caught on an edge of an object (e.g., furniture, etc.) in the facility 500, damaging the coating, or when the wiring C11 is pinched by a metal member such as a staple. A parallel arc may also occur, for example, when an overcurrent flows through the wiring C11, melting the coating, or when an animal bites the wiring C11. A parallel arc may also occur when the wiring C11 deteriorates due to continued exposure to ultraviolet rays for a long period of time.

[0015] Furthermore, the wiring abnormality may include, for example, when the wiring C11 is composed of a pair of electric wires, an arc (so-called series arc) may occur due to a partial disconnection of one of the pair of electric wires. A series arc may occur, for example, when the wiring C11 is repeatedly bent or pulled with excessive force.

[0016] The detection unit 712 has a plurality of determination functions including a first determination function and a second determination function.

[0017] The first determination function is a function for determining that a wiring abnormality has occurred when the voltage information exceeds a threshold value Th1 (see FIG. 3). In this embodiment, in the first determination function, the detection unit 712 determines whether or not a wiring abnormality has occurred in the wiring C11 depending on whether or not a voltage value related to the secondary voltage of the main breaker 3 exceeds the threshold value Th1.

[0018] The second determination function is a function for determining whether or not a wiring abnormality has occurred by a determination method different from that of the first determination function. That is, in the second determination function, the detection unit 712 determines whether or not a wiring abnormality has occurred in the wiring C11 by a method other than the method of comparing the secondary side voltage of the main breaker 3 with the threshold value Th1.

[0019] Then, the detection unit 712 detects a wiring abnormality by any one of the plurality of determination functions in response to a predetermined trigger. As an example, the "predetermined trigger" in the present disclosure is the reception of a predetermined operation input by a user of the distribution board 1 in the monitoring unit 7. For example, the detection unit 712 detects a wiring abnormality in the wiring C11 by any one of the first and second determination functions in response to the predetermined operation input by the user.

[0020] As described above, in this embodiment, the detection unit 712 has a plurality of determination functions including the second determination function in addition to the first determination function. Therefore, even if the detection unit 712 cannot determine the occurrence of a wiring abnormality in the wiring C11 using the first determination function, there is a possibility that the detection unit 712 can determine the occurrence of a wiring abnormality in the wiring C11 using the second determination function. Therefore, this embodiment has an advantage that it is easier to detect a wiring abnormality in the wiring C11 compared to an aspect in which whether or not a wiring abnormality in the wiring C11 has occurred is determined using only a single function (here, the first determination function).

[0021] (2)Details Hereinafter, the anomaly detection system 100 of the present embodiment and the distribution board 1 including the anomaly detection system 100 will be described in detail with reference to FIGS. 1 and 2. FIG.

[0022] The distribution board cabinet 10 (see FIG. 2) of the distribution board 1 is installed and used in a facility 500 such as a dwelling unit of a detached house or an apartment building. The facility 500 in which the distribution board 1 is installed is not limited to each dwelling unit of a detached house or an apartment building, and may be installed in a non-residential building (for example, a factory, a commercial building, an office building, a hospital, a school, etc.).

[0023] In the following description, unless otherwise specified, the X-axis direction in FIG. 2 is defined as the left-right direction, and the Z-axis direction is defined as the up-down direction. In addition, the directions perpendicular to the X-axis direction and the Z-axis direction are defined as the front-rear direction. Furthermore, the positive direction in the X-axis direction is defined as the right side, and the positive direction in the Z-axis direction is defined as the top side. However, these directions are merely examples, and are not intended to limit the directions in which the distribution board cabinet 10 and the distribution board 1 are used. In addition, the arrows indicating the various directions in the drawings are merely shown for the purpose of explanation and do not have any substance.

[0024] (2.1) Distribution Board First, the distribution board 1 will be described. As shown in FIG. 1, the distribution board 1 includes an abnormality detection system 100 and a distribution board cabinet 10 that houses the abnormality detection system 100. As shown in FIG. 2, the distribution board cabinet 10 houses a main breaker 3, a plurality of switches 2, a monitoring unit 7, a current measuring device 8, and a backup power supply 9 (see FIG. 1). Here, the switches 2 include a plurality of branch breakers 4, a seismic sensor breaker 5, and a grid-connection breaker 6. It is not essential that the distribution board cabinet 10 houses the monitoring unit 7, the current measuring device 8, and the backup power supply 9, and at least a part of the monitoring unit 7, the current measuring device 8, and the backup power supply 9 may be outside the distribution board cabinet 10.

[0025] The distribution board cabinet 10 includes a box-shaped body 11 (see FIG. 2) with an opening on the front, and a cover that closes the opening of the body 11. The cover is not shown in FIG. 2. The distribution board cabinet 10 is attached to a member that constitutes a building, such as a wall 110 (see FIG. 2) of a building. The distribution board cabinet 10 may be attached in a state where it is partially or entirely embedded in a mounting hole provided in the wall 110. The distribution board cabinet 10 is provided at a height position that is out of reach of a child of average height, but can be operated by an adult of average height.

[0026] Moreover, the distribution board cabinet 10 further includes a lid that covers the front surface of the cover when the distribution board cabinet 10 is attached to the wall 110. The lid is attached to the cover in a state in which it can move between a closed position and an open position. The closed position is a position in which it covers the front surface of the cover. The open position is a position in which it does not cover at least a portion of the front surface of the cover. Note that it is sufficient for the lid to cover a portion of the front surface of the cover when the cover is viewed from a certain direction, and in this embodiment, the lid in the closed position covers substantially the entire front surface of the cover when the cover is viewed from the front.

[0027] As shown in FIG. 2, the distribution board cabinet 10 contains a main breaker 3, a plurality of branch breakers 4, a seismic breaker 5, a grid-connection breaker 6, a monitoring unit 7, and a current measuring device 8. The main breaker 3, the plurality of branch breakers 4, the seismic breaker 5, the grid-connection breaker 6, the monitoring unit 7, and the current measuring device 8 are attached to the body 11 directly or via mounting parts. FIG. 2 shows the arrangement of the main breaker 3, the plurality of branch breakers 4, the seismic breaker 5, the grid-connection breaker 6, the monitoring unit 7, and the current measuring device 8 inside the distribution board cabinet 10, but these arrangements are only examples and can be changed as appropriate. In addition, the backup power source 9 is not shown in FIG. 2, but the backup power source 9 may be arranged at an appropriate position inside the distribution board cabinet 10.

[0028] The main breaker 3 is disposed inside the distribution board cabinet 10 at a position slightly to the left of the center in the left-right direction. The position of the main breaker 3 inside the distribution board cabinet 10 may be another position, such as, for example, to the right of the center. The main breaker 3 has a contact 31 (see FIG. 1) electrically connected between a primary terminal and a secondary terminal. The main breaker 3 has an operating lever on the front side for turning the contact 31 on or off. The main breaker 3 also has a detection unit 32 (see FIG. 1) for detecting an abnormal state in which, for example, a leakage current flows through the contact 31. When the detection unit 32 detects an abnormal state in which a leakage current flows through the contact 31, the main breaker 3 opens the contact 31. In this way, the main breaker 3 cuts off the power supply to the secondary side circuit of the main breaker 3 to protect the circuit. When the detection unit 32 detects an overcurrent such as a short circuit current or an overload current, the main breaker 3 opens the contact 31. Furthermore, the detection unit 32 of the main breaker 3 has a function of detecting an open-phase state of the neutral wire in a single-phase three-wire system. When the detection unit 32 detects an open-phase state of the neutral wire, the main breaker 3 opens the contact 31. The main breaker 3 may also have a limiter function that opens the contact 31 when a current that exceeds a predetermined limit value flows.

[0029] A conductive bar of a first voltage pole (L1 phase), a conductive bar of a second voltage pole (L2 phase), and a conductive bar of a neutral pole (N phase) in the single-phase three-wire wiring are connected to the secondary terminal of the main breaker 3. Each conductive bar is formed into a long plate shape that is long in the left-right direction from a conductive member, and is disposed in the distribution board cabinet 10 at a position to the right of the main breaker 3 in the center in the up-down direction.

[0030] The branch breakers 4 are arranged in a left-right line on the upper and lower sides of each conductive bar. In this embodiment, as shown in Fig. 2, 12 branch breakers 4 are arranged in a left-right line on the upper side of each conductive bar. Also, 11 branch breakers 4 are arranged in a left-right line on the lower side of each conductive bar.

[0031] Each branch breaker 4 has a pair of primary terminals and a pair of secondary terminals. Each branch breaker 4 has contacts that are electrically connected between the primary terminals and the secondary terminals. An operating lever is provided on the front surface of each branch breaker 4 for turning on and off the contacts built into each branch breaker 4.

[0032] The branch breaker 4 is available for 100V and 200V. A pair of primary side terminals of the 100V branch breaker 4 is electrically connected to one of the conductive bars of the first voltage pole and the conductive bar of the second voltage pole, and to the conductive bar of the neutral pole. A pair of primary side terminals of the 200V branch breaker 4 is electrically connected to the conductive bar of the first voltage pole and the conductive bar of the second voltage pole, respectively. In addition, a corresponding wiring C11 is electrically connected to the secondary side terminal of the branch breaker 4. For example, one or more electrical appliances 23 such as lighting equipment and hot water supply equipment, wiring appliances such as a socket 22 (see FIG. 1) or a wall switch are connected to the wiring C11 connected to the secondary side terminal of each branch breaker 4 as loads. Therefore, the distribution board 1 can supply power to the electrical appliance 23 connected to the secondary side terminal of the branch breaker 4 via the wiring C11, or the electrical appliance 24 (for example, an air conditioner or a television receiver) connected to the socket 22.

[0033] The branch breaker 4 also includes a detection unit 41 (see FIG. 1) that detects an abnormal state in which an overcurrent, such as a short circuit current or an overload current, flows through contacts built into the branch breaker 4. When the detection unit 41 detects an abnormal state in which an overcurrent flows through the contacts, the branch breaker 4 opens the contacts. This causes the branch breaker 4 to cut off the power supply to the circuit on the secondary side of the branch breaker 4, protecting the circuit. The detection unit 41 also has a function of detecting a leakage state in the wiring C11 connected to the branch breaker 4. When the detection unit 41 detects the occurrence of a leakage current, the branch breaker 4 opens the contacts.

[0034] The seismic breaker 5 is arranged below the conductive bar so as to be aligned with the branch breaker 4 in the left-right direction. The seismic breaker 5 has a seismic sensor 51 that detects vibrations applied to the distribution board cabinet 10. When the seismic sensor 51 detects vibrations exceeding a predetermined reference value (for example, earthquake motion of seismic intensity 5), the seismic breaker 5 performs a cut-off operation to cut off the circuit. The seismic breaker 5 generates a pseudo earth leakage state by, for example, electrically connecting the first voltage pole or the second voltage pole and the neutral pole via an impedance element with a relatively low resistance. When the seismic breaker 5 generates a pseudo earth leakage state, the detection unit 32 of the main breaker 3 detects the pseudo earth leakage state generated by the seismic breaker 5, and the main breaker 3 opens the contact 31. As a result, when vibrations exceeding the reference value are applied to the distribution board cabinet 10 due to an earthquake or the like, the power supply to the circuit connected to the secondary side of the main breaker 3 can be cut off.

[0035] A distributed power source 21 provided in the facility 500 is connected to the interconnection breaker 6. The interconnection breaker 6 is electrically connected between the conductive bar electrically connected to the secondary terminal of the main breaker 3 and the distributed power source 21. When the contact of the interconnection breaker 6 is turned on, the distributed power source 21 is connected to the system power source 20 and can supply power to the load. On the other hand, when the contact of the interconnection breaker 6 is turned off, the distributed power source 21 is disconnected from the system power source 20. The interconnection breaker 6 has a detection function for detecting, for example, the occurrence of a leakage current. When the detection function of the interconnection breaker 6 detects the occurrence of a leakage current, the interconnection breaker 6 performs a cutoff operation and disconnects the distributed power source 21 from the system power source 20. The interconnection breaker 6 may have a detection function for detecting an overcurrent such as a short circuit current, and may be configured to perform a cutoff operation when the detection function of the interconnection breaker 6 detects an overcurrent.

[0036] The current measuring device 8 is configured to measure the current flowing through the loads (electrical devices 23, 24, etc.) connected to each of the multiple branch breakers 4. The current measuring device 8 has, for example, a substrate and multiple coils. The substrate is a plate-like shape that is long in the left-right direction. Multiple holes are formed in the substrate. Terminals extending from the conductive bar and connected to the primary terminals of the branch breakers 4 are inserted into each of the multiple holes. The coils are, for example, Rogowski coils, and are formed around the holes in the substrate. In this embodiment, the current measuring device 8 measures the current flowing through each of the multiple branch breakers 4 and the interconnection breaker 6. Here, the current measuring device 8 (current sensor) is shared with a sensor used in an energy management system that manages the energy used in the facility 500 in which the distribution board 1 is installed. The current measuring device 8 is not limited to an aspect having a Rogowski coil, and may have, for example, a sensor such as a current transformer, a Hall element, a magnetic resistance element such as a GMR (Giant Magnetic Resistances) element, or a shunt resistor.

[0037] The backup power supply 9 includes a battery 91, which is a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery, and a charging circuit that charges the battery 91. The charging circuit of the backup power supply 9 receives power from the primary side of the main breaker 3 and charges the battery 91. When the system power supply 20 experiences a power outage, the backup power supply 9 supplies power to the monitoring unit 7 and the like using the battery 91 as a power source. Therefore, even when the system power supply 20 experiences a power outage, the monitoring unit 7 can operate by receiving power from the backup power supply 9. When the system power supply 20 is normal, the monitoring unit 7 operates by receiving power from the primary side of the main breaker 3 (system power supply 20).

[0038] Here, the switch 2 further includes a communication unit 201. The communication unit 201 is configured to be able to communicate with a first communication unit 72 (described later) of the monitoring unit 7. The communication unit 201 transmits and receives signals to and from the monitoring unit 7 directly or indirectly via a network, a repeater, or the like, by an appropriate communication method such as wired communication or wireless communication. Here, each of the multiple switches 2 is set with a unique address. In other words, the communication unit 201 communicates with the monitoring unit 7 by using the address set in the switch 2 (an address stored in a memory, or the like).

[0039] In this embodiment, the communication unit 201 and the monitoring unit 7 are capable of bidirectional communication with each other, and both signals can be transmitted from the communication unit 201 to the monitoring unit 7 and signals can be transmitted from the monitoring unit 7 to the communication unit 201.

[0040] Moreover, in this embodiment, the communication unit 201 uses the board of the current measuring device 8 as at least a part of the communication path between the communication unit 201 and the monitoring unit 7. In other words, the conductive layer of the board configures a part of the communication path between the communication unit 201 and the monitoring unit 7. The communication method between the communication unit 201 and the board can be appropriately wired communication conforming to a communication standard such as RS-485 or wired LAN.

[0041] (2.2) Anomaly Detection System Next, the anomaly detection system 100 will be described with reference to Fig. 1. In this embodiment, as already described, the components of the anomaly detection system 100 are included in the monitoring unit 7, and therefore, hereinafter, the anomaly detection system 100 will be described together with the description of the monitoring unit 7.

[0042] The monitoring unit 7 is disposed inside the distribution board cabinet 10 on the left side of the main breaker 3. The monitoring unit 7 operates by receiving power from the primary side of the main breaker 3, so it can operate even when the main breaker 3 performs a cutoff operation. Note that in the event of a power outage in the system power supply 20, the monitoring unit 7 receives power from the backup power supply 9, so it can operate even when the system power supply 20 is out of power.

[0043] More specifically, the monitoring unit 7 of this embodiment includes a control unit 71, a first communication unit 72, a second communication unit 73, and a storage unit 74.

[0044] The first communication unit 72 communicates with the controller 25 and the like installed in the facility 500. The controller 25 controls or monitors devices compatible with a Home Energy Management System (HEMS) (hereinafter referred to as HEMS-compatible devices). That is, the controller 25 can acquire instantaneous power and power amounts of each of a plurality of loads (electrical devices 23, 24, etc.) connected to a plurality of branch breakers 4 by communicating with the monitoring unit 7, and can control or monitor the HEMS-compatible devices. The controller 25 is disposed outside the distribution board cabinet 10. Here, the HEMS-compatible devices include, for example, a smart meter, a solar power generation device, a power storage device, a fuel cell, an electric vehicle, an air conditioner, a lighting device, a hot water supply device, a refrigerator, or a television receiver. Note that the HEMS-compatible devices are not limited to these devices.

[0045] The communication method between the first communication unit 72 and the controller 25 is wireless communication using radio waves as a medium, conforming to a communication standard such as a specific low-power radio station (a radio station not requiring a license) in the 920 MHz band, Wi-Fi (registered trademark), or Bluetooth (registered trademark). The communication method between the first communication unit 72 and the controller 25 may be wired communication conforming to a communication standard such as a wired LAN (Local Area Network). The communication protocol used in the communication between the first communication unit 72 and the controller 25 is, for example, Ethernet (registered trademark), ECHONET Lite (registered trademark), or the like.

[0046] As already described, the first communication unit 72 communicates with the communication unit 201 of each switch 2 using a part of the conductive layer of the substrate of the current measuring device 8.

[0047] The second communication unit 73 has a communication function for communicating with the management server 300 and the information terminal 400 via a wide area network 200 such as the Internet. Here, the information terminal 400 is, for example, a terminal carried by a user of the distribution board 1, such as a smartphone or a tablet computer. The information terminal 400 may also be, for example, a desktop or laptop personal computer.

[0048] The storage unit 74 includes, for example, an electrically rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) and a volatile memory such as a RAM (Random Access Memory). The storage unit 74 stores the detection result of the detection unit 712 when a wiring abnormality occurs in the wiring C11.

[0049] The control unit 71 includes, for example, a computer system. The computer system is mainly composed of a processor and a memory as hardware. The function of the control unit 71 is realized by the processor executing a program recorded in the memory of the computer system. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunication line, or may be recorded and provided on a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system.

[0050] The control unit 71 includes the functions of an acquisition unit 711, a detection unit 712, an output unit 713, and a cutoff control unit 714.

[0051] The acquisition unit 711 measures the power passing through at least one of the main breaker 3 and the branch breaker 4 in the distribution board 1. The monitoring unit 7 of this embodiment is electrically connected to a main current measurement device that measures the current flowing through the main breaker 3, and a current measurement device 8. Here, the main current measurement device is equipped with a current sensor consisting of, for example, a current transformer (CT). The acquisition unit 711 receives the current value flowing through each of the multiple branch breakers 4 and the interconnection breaker 6 measured by the current measurement device 8 from the current measurement device 8. In other words, the acquisition unit 711 acquires current information related to the current flowing through each of the multiple circuits C1 connected to the distribution board 1. Furthermore, the acquisition unit 711 receives the current value measured by the main current measurement device from the main current measurement device. The acquisition unit 711 converts each of the current values ​​measured by the current measurement device 8 and the main current measurement device into a power value (instantaneous power value). The acquisition unit 711 also has a function of calculating data on the amount of power obtained by integrating the collected instantaneous power data over a predetermined period of time.

[0052] Furthermore, in this embodiment, the acquisition unit 711 receives from the voltage measurement device the voltage values ​​of the line voltage between the first voltage pole and neutral pole, the line voltage between the second voltage pole and neutral pole, and the line voltage between the first voltage pole and second voltage pole, which are measured by the voltage measurement device in the circuit on the secondary side of the main breaker 3. In other words, the acquisition unit 711 acquires voltage information on the voltage applied to the circuit C1 connected to the distribution board 1 (the voltage value of the voltage applied between the two poles in the circuit on the secondary side of the main breaker 3).

[0053] The detection unit 712 detects a wiring abnormality in the wiring C11 included in the circuit C1 connected to the distribution board 1. The detection unit 712 detects a wiring abnormality in the wiring C11 included in any of the circuits C1, based on voltage information related to the voltage applied to the circuit C1 acquired by the acquisition unit 711. The detection result related to the wiring abnormality in the wiring C11 detected by the detection unit 712 is stored in the storage unit 74.

[0054] In this embodiment, the detection unit 712 can detect the occurrence of an arc as a wiring abnormality in the wiring C11. Specifically, the detection unit 712 can determine whether or not an arc has occurred in the wiring C11 by using a technology similar to that of an arc fault circuit interrupter (AFCI). That is, the arc fault circuit interrupter can use an electronic circuit to recognize current characteristics and voltage characteristics specific to an arc occurring in the wiring C11 and detect an arc occurring in the wiring C11. Using a similar principle, the detection unit 712 can determine whether or not an arc has occurred in the wiring C11.

[0055] Here, in this embodiment, the detection unit 712 has a plurality of determination functions including a first determination function and a second determination function. Then, the detection unit 712 detects a wiring abnormality by any one of the plurality of determination functions in response to an operation input by a user as a predetermined trigger. In this embodiment, for example, the user can operate an operation unit (for example, a DIP switch) provided in the monitoring unit 7 to switch the determination function used by the detection unit 712.

[0056] In the first determination function, the detection unit 712 compares the voltage information acquired by the acquisition unit 711 with a threshold value Th1 (see FIG. 3). When the voltage information exceeds the threshold value Th1, the detection unit 712 determines that an arc has occurred in the wiring C11, that is, that a wiring abnormality has occurred in the wiring C11. For example, a CR circuit in which a capacitor and a resistor are connected in series is connected in parallel to an electric path connecting the first voltage pole and the second voltage pole, an electric path connecting the first voltage pole and the neutral pole, and an electric path connecting the second voltage pole and the neutral pole. When the voltage value of the voltage applied to both ends of the resistor for each of these CR circuits exceeds the threshold value Th1, the detection unit 712 determines that an arc has occurred in the wiring C11 connected to the corresponding CR circuit, that is, that a wiring abnormality has occurred in the wiring C11. In other words, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11 when high-frequency noise due to the occurrence of an arc occurs in these electric paths. Hereinafter, unless otherwise specified, the above voltage value is referred to as "voltage information".

[0057] In the second determination function, the detection unit 712 determines whether an arc has occurred in the wiring C11, that is, whether a wiring abnormality has occurred in the wiring C11, by a determination method different from that of the first determination function. The second determination functions are listed below. In this embodiment, the multiple determination functions of the detection unit 712 may include all of the second determination functions listed below, or may include only some of the second determination functions. In other words, it is sufficient for the detection unit 712 to have at least a first determination function and one second determination function as the multiple determination functions.

[0058] In the second determination function, the detection unit 712 may determine whether or not a wiring abnormality has occurred by comparing the voltage information with a plurality of threshold values ​​Th2. For example, as shown in Fig. 4, the detection unit 712 compares the voltage information acquired by the acquisition unit 711 with a plurality of (here, three) threshold values ​​Th2. The three threshold values ​​Th2 are, in order from the smallest, a "first threshold value Th21", a "second threshold value Th22", and a "third threshold value Th23".

[0059] The detection unit 712 determines that a wiring abnormality has occurred in the wiring C11 according to different threshold values ​​Th2. For example, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11 when the number of times that the voltage information exceeds the first threshold value Th21 exceeds five times in a predetermined time. For example, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11 when the number of times that the voltage information exceeds the second threshold value Th22 exceeds two times in a predetermined time. For example, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11 when the voltage information exceeds the third threshold value Th23 even once.

[0060] In the second determination function, the detection unit 712 may determine whether or not a wiring abnormality has occurred by comparing the voltage information with a threshold value Th2 different from the threshold value Th1 of the first determination function. For example, the detection unit 712 compares the voltage information acquired by the acquisition unit 711 with a threshold value Th2 as shown in FIG. 4. The threshold value Th2 may be any one of the first threshold value Th21 to the third threshold value Th23 as long as it is different from the threshold value Th1 of the first determination function, or may be a threshold value different from these threshold values. Then, when the voltage information exceeds the threshold value Th2, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11.

[0061] In the second determination function, the detection unit 712 may determine whether a wiring abnormality has occurred based on whether the number of times the threshold value Th1 of the first determination function has been exceeded exceeds a predetermined number of times in a predetermined time. For example, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11 when the number of times the voltage information has exceeded the threshold value Th1 exceeds a predetermined number of times during a determination period (predetermined time) T1 (see FIG. 3).

[0062] Here, the determination period T1 for determining whether or not a wiring abnormality has occurred may be variable. The determination period T1 can be appropriately set by, for example, the user operating the monitoring unit 7. For example, as shown in FIG. 6, the detection unit 712 may determine whether or not a wiring abnormality has occurred in the wiring C11 in a determination period T2 that is an even longer determination period T1. In this embodiment, even if the number of times that the voltage information has exceeded the threshold value Th1 does not reach a predetermined number in the determination period T1, if the number of times that the voltage information has exceeded the threshold value Th1 reaches a predetermined number in the determination period T2, the detection unit 712 can determine that a wiring abnormality has occurred in the wiring C11.

[0063] In the second determination function, the detection unit 712 may determine whether a wiring abnormality has occurred based on whether an integrated value of the voltage information has exceeded a predetermined integrated value Th3. For example, as shown in FIG. 5, the detection unit 712 compares the integrated value of the voltage information acquired by the acquisition unit 711 with a predetermined integrated value Th3. In the example shown in FIG. 5, the instantaneous value of the voltage information is indicated by a solid line, and the integrated value of the voltage information is indicated by a dashed dotted line. The integrated value of the voltage information is obtained by inputting the voltage information to an integrating circuit using an operational amplifier such as an op-amp. Then, when the integrated value of the voltage information exceeds the predetermined integrated value Th3, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11.

[0064] The output unit 713 performs output according to the detection result by the detection unit 712. In this embodiment, the output unit 713 executes a process of presenting the detection result regarding the wiring abnormality at least when a wiring abnormality occurs in the wiring C11. For example, the output unit 713 visually presents the detection result to the user by displaying a character string and / or an image on a display device (e.g., a liquid crystal display, etc.) equipped in the monitoring unit 7 or a display device connected to the monitoring unit 7. Also, for example, the output unit 713 visually presents the detection result to the user by turning on a light source including a solid-state light-emitting element such as an LED (Light Emitting Diode) equipped in the monitoring unit 7. Also, for example, the output unit 713 audibly presents the detection result to the user by outputting a voice message from a speaker equipped in the monitoring unit 7 or a speaker connected to the monitoring unit 7.

[0065] Furthermore, the output unit 713 transmits the detection result of the detection unit 712 to the information terminal 400 of the user via the second communication unit 73. As an example, when the detection unit 712 detects a wiring abnormality in the wiring C11, the output unit 713 transmits a signal including the detection result to the information terminal 400 via the second communication unit 73. The user can know the detection result of the detection unit 712 by operating the information terminal 400, for example, viewing an email or starting an application for the monitoring system 100 installed in the information terminal 400.

[0066] The cutoff control unit 714 outputs a control signal for controlling the circuit C1 to the circuit C1. That is, the cutoff control unit 714 can control each of the multiple circuits C1. In the present disclosure, "control of the circuit C1" may include cutting off the power supply to the circuit C1, restoring the circuit C1, and limiting the current flowing through the circuit C1. As an example, the cutoff control unit 714 can cut off the power supply to the circuit C1 including the branch breaker 4 by outputting a control signal to the branch breaker 4 to open the contacts built into the branch breaker 4.

[0067] In this embodiment, when a first cutoff condition is satisfied, for example, when the detection unit 712 detects a wiring abnormality in the wiring C11, the cutoff control unit 714 outputs a control signal to the circuit C1 including the wiring C11 in which the wiring abnormality is detected, to cut off the power supply to the circuit C1. If an arc occurs in the wiring C11, an electric fire or the like may occur due to the arc. Therefore, in this embodiment, when a wiring abnormality in the wiring C11 is detected, the power supply to the circuit C1 is cut off, thereby making it possible to prevent an electric fire from occurring.

[0068] In this embodiment, the cutoff control unit 714 can also output a control signal to the circuit C1 including the wiring C11 in which a wiring abnormality has been detected when a second cutoff condition described below is satisfied. The user can select whether to adopt the first cutoff condition or the second cutoff condition by operating an operation unit provided in the monitoring unit 7, for example.

[0069] When determining whether the second shutoff condition is satisfied, the detection unit 712 refers to not only the voltage information but also the current information. That is, the acquisition unit 711 further acquires current information related to the current flowing through the circuit C1. Then, the detection unit 712 determines whether or not to shut off the circuit C1 in which a wiring abnormality is detected, based on the voltage information and the current information. Specifically, the detection unit 712 determines whether or not a wiring abnormality has occurred in the wiring C11, based on the voltage information. Then, when the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11, if the current information exceeds a threshold current, the detection unit 712 determines that the second shutoff condition is satisfied. Then, the shutoff control unit 714 outputs a control signal to the circuit C1 including the wiring C11 in which the wiring abnormality has been detected. That is, when the detection unit 712 detects a wiring abnormality and the current flowing through the circuit C1 in which the wiring abnormality has been detected exceeds a threshold current, the shutoff control unit 714 shuts off the branch breaker 4 to which the circuit C1 is connected.

[0070] An example of control based on the second cutoff condition by the cutoff control unit 714 will be described below with reference to Fig. 7. In the example shown in Fig. 7, the detection unit 712 determines whether the second cutoff condition is satisfied based on a comparison between the voltage information and two voltage thresholds Th41 and Th42, and a comparison between the current information and two current thresholds Th51 and Th52. Specifically, the detection unit 712 determines that the voltage information is equal to or lower than the voltage threshold Th41 and the current information is equal to or lower than the current threshold Th51 (see the blank area in Fig. 7).

[0071] On the other hand, when the voltage information exceeds the voltage threshold Th42 or the current information exceeds the current threshold Th52 (see the shaded area in FIG. 7), the detection unit 712 determines that the second cutoff condition is satisfied. Also, when the voltage information exceeds the voltage threshold Th41 and the current information exceeds the current threshold Th51 (see the shaded area in FIG. 7), the detection unit 712 determines that the second cutoff condition is satisfied. In other words, when the second cutoff condition is satisfied, the detection unit 712 determines that there is a risk of an electrical fire occurring.

[0072] In other cases (see the dotted regions in FIG. 7), the detection unit 712 causes the output unit 713 to present information to alert the user in addition to the detection result regarding the wiring abnormality. That is, in this case, the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11, but the risk of an electrical fire occurring is relatively low. In this case, the cutoff control unit 714 does not cut off the power supply to the circuit C1, so it is easy to maintain the power supply to the circuit C1, for example, lighting equipment, refrigerators, wine cellars, life-saving devices, and the like, for which it is undesirable for the power supply to be cut off.

[0073] Furthermore, in this embodiment, when the shutoff control unit 714 restores the shutoff circuit C1 and there are multiple target circuits C1, the shutoff control unit 714 restores the circuit C1 from the shutoff state as follows. That is, the shutoff control unit 714 restores the circuit C1 in which the current flowing or the power passing therethrough is smaller than a predetermined value from the shutoff state. For example, the shutoff control unit 714 restores the circuit C1 in which the current information acquired by the acquisition unit 711 is smaller than a predetermined value. In this way, in this embodiment, the shutoff control unit 714 preferentially restores from the shutoff state the circuit C1 in which the risk of a wiring abnormality in the wiring C11 occurring again is relatively low.

[0074] In this embodiment, even if the main breaker 3 performs a cutoff operation, power is supplied to the monitoring unit 7 from the primary side of the main breaker 3. Therefore, the control unit 71 can operate when the system power supply 20 is not in a power outage. Furthermore, power is supplied to the monitoring unit 7 from the backup power supply 9 when the system power supply 20 is in a power outage. Therefore, the control unit 71 can operate even when the system power supply 20 is in a power outage. Note that, although the backup power supply 9 is provided outside the monitoring unit 7 in this embodiment, the backup power supply 9 may be built into the monitoring unit 7.

[0075] (3) Operation The operation of the anomaly detection system 100 of this embodiment will be described below with reference to Fig. 8. In the following, it is assumed that the detection unit 712 has, as a plurality of determination functions, a first determination function and one of the plurality of second determination functions described in "(2.2) Anomaly Detection System". In the following, it is also assumed that the cutoff control unit 714 cuts off the power supply to the circuit C1 when the first cutoff condition is satisfied.

[0076] First, the acquisition unit 711 periodically acquires voltage information by periodically receiving a measurement value from a voltage measurement device (S1). The period for acquiring the voltage information is, for example, several ms. The process S1 corresponds to an acquisition step ST1 described later.

[0077] Next, when the first judgment function is employed (S2: Yes), if the first judgment condition is satisfied (S3: Yes), the detection unit 712 judges that a wiring abnormality has occurred in the wiring C11 (S5). The first judgment condition is that the voltage information exceeds the threshold value Th1. On the other hand, when the second judgment function is employed (S4: Yes), if the second judgment condition is satisfied (S4: Yes), the detection unit 712 judges that a wiring abnormality has occurred in the wiring C11 (S5). The second judgment condition here is that the number of times that the voltage information has exceeded the threshold value Th1 exceeds a predetermined number of times. The process S3 corresponds to a first judgment step ST31 of a detection step ST2 described later, the process S4 corresponds to a second judgment step ST32 of a detection step ST2 described later, and the process S5 is included in a detection step ST2 described later.

[0078] When the detection unit 712 detects the occurrence of a wiring abnormality in the wiring C11, the cutoff control unit 714 outputs a control signal to the circuit C1 including the wiring C11 in which the wiring abnormality has been detected, thereby cutting off the power supply to the circuit C1 (S6). Then, the output unit 713 executes a process of presenting the detection result regarding the wiring abnormality in the wiring C11 (S7).

[0079] As described above, in this embodiment, the detection unit 712 has a plurality of determination functions including the second determination function in addition to the first determination function. Therefore, even if the first determination function is not able to determine the occurrence of a wiring abnormality in the wiring C11, the second determination function may be able to determine the occurrence of a wiring abnormality in the wiring C11. For example, even if the high-frequency component accompanying the occurrence of an arc superimposed on the voltage applied to the circuit C1 is so small that it cannot be determined by the first determination function, the second determination function may be able to determine it. Also, for example, even if the voltage applied to the circuit C1 is so noise-mixed that it cannot be determined by the first determination function, the second determination function may be able to determine it.

[0080] Therefore, the present embodiment has an advantage that it is easier to detect a wiring abnormality in the wiring C11, compared to a mode in which it is determined whether or not a wiring abnormality in the wiring C11 has occurred by only a single function (here, the first determination function).

[0081] (4) Variations The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. In addition, functions equivalent to the anomaly detection system 100 may be embodied in an anomaly detection method, a (computer) program, or a non-transitory recording medium on which a program is recorded, etc.

[0082] The anomaly detection method according to one embodiment includes an acquisition step ST1 and a detection step ST2. The acquisition step ST1 is a step of acquiring voltage information related to a voltage applied to a circuit C1 connected to a distribution board 1. The detection step ST2 is a step of detecting a wiring anomaly of the wiring C11 in the circuit C1 based on the voltage information acquired in the acquisition step ST1. The detection step ST2 includes a plurality of determination steps including a first determination step ST31 and a second determination step ST32. The first determination step ST31 is a step of determining that a wiring anomaly has occurred when the voltage information exceeds a threshold value Th1. The second determination step ST32 is a step of determining whether or not a wiring anomaly has occurred by a determination method different from that of the first determination step ST31. The detection step ST2 detects a wiring anomaly in any one of the plurality of determination steps in response to a predetermined trigger. In addition, the program according to one embodiment causes one or more processors to execute the above anomaly detection method.

[0083] Modifications of the above-described embodiment are listed below. The modifications described below can be applied in appropriate combination.

[0084] The anomaly detection system 100 in the present disclosure includes a computer system, for example, in the detection unit 712. The computer system is mainly composed of a processor and a memory as hardware. The processor executes a program recorded in the memory of the computer system to realize the function of the anomaly detection system 100 in the present disclosure. The program may be pre-recorded in the memory of the computer system, provided through an electric communication line, or provided by recording it in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits such as IC or LSI referred to here are called by different names depending on the degree of integration, and include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Furthermore, a field-programmable gate array (FPGA) that is programmed after the manufacture of the LSI, or a logic device that can reconfigure the connection relationship inside the LSI or reconfigure the circuit partition inside the LSI, can also be adopted as a processor. The electronic circuits may be integrated in one chip or distributed among multiple chips. The chips may be integrated in one device or distributed among multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Thus, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0085] Furthermore, it is not essential for the anomaly detection system 100 that multiple functions are concentrated in one housing (monitoring unit 7), and the components of the anomaly detection system 100 may be distributed across multiple housings. Furthermore, at least a portion of the functions of the anomaly detection system 100, such as the detection unit 712, may be realized by, for example, the cloud (cloud computing), etc. Conversely, as in the above-described embodiment, all of the functions of the anomaly detection system 100 may be concentrated in one housing (monitoring unit 7).

[0086] In the above-described embodiment, the monitoring unit 7 may not include the second communication unit 73. In other words, the anomaly detection system 100 may not have a communication function for communicating with the management server 300 and the information terminal 400 via a wide area network 200 such as the Internet. In this embodiment, the detection result of the detection unit 712 is presented to the user only by the distribution board 1.

[0087] In the above-described embodiment, the monitoring unit 7 does not need to include the output unit 713. In other words, the anomaly detection system 100 does not need to have a function of presenting the detection result of the detection unit 712.

[0088] In the above-described embodiment, two CR circuits may be connected in parallel to one electric path. In this embodiment, one CR circuit includes a capacitor having a frequency characteristic different from the frequency characteristic of the impedance of the capacitor included in the other CR circuit. Then, the detection unit 712 may determine, using the second determination function, that an arc has occurred in the wiring C11 when the voltage applied to both ends of the resistors in both of the two CR circuits exceeds a threshold value. In this embodiment, the frequency characteristic of the impedance of the capacitor included in each of the two CR circuits may be the same.

[0089] In the above-described embodiment, the detection unit 712 may hold a peak value of the voltage information and compare the held peak value with a threshold value Th1 or the like to determine whether or not a wiring abnormality has occurred in the wiring C11, as shown in Fig. 9, for example. In the example shown in Fig. 9, the instantaneous value of the voltage information is represented by a solid line, and the peak value held by the peak hold circuit is represented by a dashed dotted line. The peak value of the voltage information is held by inputting the voltage information to a peak hold circuit that uses an operational amplifier such as an operational amplifier.

[0090] In the above embodiment, when the detection unit 712 determines by the first determination function that a wiring abnormality has occurred in the wiring C11, the detection unit 712 may further automatically determine by the second determination function whether or not a wiring abnormality has occurred in the wiring C11. That is, the detection unit 712 may detect a wiring abnormality by the second determination function when the voltage information satisfies a predetermined condition as a predetermined trigger. Here, the predetermined trigger is, for example, the first determination function determining that a wiring abnormality has occurred in the wiring C11, but may be another trigger. For example, the predetermined trigger may be the time during which the voltage information exceeds the threshold value Th1 elapses for a predetermined time.

[0091] In the above embodiment, when the detection unit 712 determines that a wiring abnormality has occurred in the wiring C11, the tripping control unit 714 trips the corresponding branch breaker 4, but this is not limited to the above. For example, when the detection unit 712 detects a wiring abnormality, the tripping control unit 714 may trip the main breaker 3.

[0092] In the above-described embodiment, the thresholds Th1, Th2 and the determination periods T1, T2 may be variable in each of the first and second determination functions. That is, the thresholds Th1, Th2 and the determination periods T1, T2 may be appropriately set by, for example, the user operating the monitoring unit 7.

[0093] In the above-described embodiment, the detection unit 712 may detect a wiring abnormality in the wiring C11 by using, for example, a classifier that has been trained by machine learning. As an example, if the classifier has a second determination function, the classifier takes voltage information as input data and outputs the presence or absence of a wiring abnormality in the wiring C11. Note that the classifier may be capable of executing re-learning while the anomaly detection system 100 is in use.

[0094] The classifier may include a linear classifier such as a Support Vector Machine (SVM), a classifier using a neural network, or a classifier generated by deep learning using a multi-layer neural network. When the classifier is a classifier using a trained neural network, the trained neural network may include a Convolutional Neural Network (CNN) or a Bayesian Neural Network (BNN), for example. In this case, the detection unit 712 is realized by implementing a trained neural network in an integrated circuit such as an Application Specific Integrated Circuit (ASIC) or a Field-Programmable Gate Array (FPGA).

[0095] (summary) As described above, the anomaly detection system (100) according to the first aspect includes an acquisition unit (711) and a detection unit (712). The acquisition unit (711) acquires voltage information related to a voltage applied to a circuit (C1) connected to a distribution board (1). The detection unit (712) detects a wiring anomaly in the wiring (C11) in the circuit (C1) based on the voltage information acquired by the acquisition unit (711). The detection unit (712) has a plurality of determination functions including a first determination function and a second determination function. The first determination function is a function for determining that a wiring anomaly has occurred when the voltage information exceeds a threshold value (Th1). The second determination function is a function for determining whether or not a wiring anomaly has occurred by a determination method different from that of the first determination function. The detection unit (712) detects a wiring anomaly by any one of the plurality of determination functions in response to a predetermined trigger.

[0096] This embodiment has the advantage that wiring abnormalities in the wiring (C11) can be easily detected.

[0097] In the anomaly detection system (100) according to the second aspect, in the first aspect, the second determination function determines whether or not a wiring anomaly has occurred by comparing the voltage information with a plurality of thresholds (Th2).

[0098] According to this aspect, there is an advantage that it is possible to expect improvement in the accuracy of detecting wiring abnormalities in the wiring (C11) compared to the first determination function.

[0099] In the anomaly detection system (100) according to the third aspect, in the first or second aspect, in the second determination function, the detection unit (712) determines whether or not a wiring anomaly has occurred by comparing the voltage information with a threshold value (Th2) different from the threshold value (Th1) of the first determination function.

[0100] According to this aspect, there is an advantage that it is possible to expect improvement in the accuracy of detecting wiring abnormalities in the wiring (C11) compared to the first determination function.

[0101] In the anomaly detection system (100) according to the fourth aspect, in any of the first to third aspects, in the second judgment function, the detection unit (712) judges whether or not a wiring anomaly has occurred based on whether or not the number of times that the threshold value (Th1) of the first judgment function is exceeded exceeds a predetermined number of times within a predetermined time.

[0102] According to this aspect, there is an advantage that it is possible to expect improvement in the accuracy of detecting wiring abnormalities in the wiring (C11) compared to the first determination function.

[0103] In the anomaly detection system (100) according to the fifth aspect, the determination period (T1) for determining whether or not a wiring anomaly has occurred in the fourth aspect is variable.

[0104] According to this aspect, there is an advantage that it is possible to expect improvement in the accuracy of detecting wiring abnormalities in the wiring (C11) compared to the first determination function.

[0105] In the anomaly detection system (100) according to the sixth aspect, in any of the first to fifth aspects, in the second determination function, the detection unit (712) determines whether or not a wiring anomaly has occurred based on whether or not an integrated value of the voltage information has exceeded a predetermined integrated value (Th3).

[0106] According to this aspect, there is an advantage that it is possible to expect improvement in the accuracy of detecting wiring abnormalities in the wiring (C11) compared to the first determination function.

[0107] In the anomaly detection system (100) according to the seventh aspect, in any of the first to sixth aspects, the detection unit (712) detects a wiring anomaly using a second determination function when voltage information satisfies a predetermined condition as a predetermined trigger.

[0108] According to this aspect, there is an advantage that the user can utilize the second determination function without manually switching to the second determination function.

[0109] In the anomaly detection system (100) according to an eighth aspect, in any one of the first to seventh aspects, the acquisition unit (711) further acquires current information related to a current flowing through the circuit (C1). The detection unit (712) determines whether or not to shut off the circuit (C1) in which a wiring anomaly is detected, based on the voltage information and the current information.

[0110] This embodiment has the advantage that it is easier to maintain the power supply to the circuit (C1) to which it is undesirable for the power supply to be interrupted, compared to a case in which the circuit (C1) in which a wiring abnormality is detected is immediately shut off when a wiring abnormality in the wiring (C11) is detected.

[0111] The anomaly detection system (100) according to the ninth aspect is the same as the eighth aspect, and further includes a tripping control unit (714). When the detection unit (712) detects a wiring anomaly and the current flowing through the circuit (C1) in which the wiring anomaly is detected exceeds a threshold current, the tripping control unit (714) trips the branch breaker (4) to which the circuit (C1) is connected.

[0112] This embodiment has the advantage that it is easier to maintain the power supply to the circuit (C1) to which it is undesirable for the power supply to be interrupted, compared to a case in which the circuit (C1) in which a wiring abnormality is detected is immediately shut off when a wiring abnormality in the wiring (C11) is detected.

[0113] The anomaly detection system (100) according to the tenth aspect is the same as the eighth aspect, and further includes a tripping control unit (714). When the detection unit (712) detects a wiring anomaly, the tripping control unit (714) trips the main breaker (3).

[0114] According to this embodiment, there is an advantage that improved safety can be expected by cutting off the power supply to all circuits (C1) compared to a case in which the power supply to at least one circuit (C1) is maintained.

[0115] In the anomaly detection system (100) according to the eleventh aspect, in the ninth or tenth aspect, the cutoff control unit (714) restores from the cutoff state the circuit (C1) in which the current flowing or the power passing therethrough is smaller than a predetermined value.

[0116] According to this embodiment, it is possible to resume the power supply to the circuit (C1) which has a relatively low risk of occurrence of wiring abnormality in the wiring (C11), and therefore there is an advantage that it is expected to improve convenience.

[0117] A distribution board (1) according to a twelfth aspect includes an abnormality detection system (100) according to any one of the first to eleventh aspects, and a distribution board cabinet (10) that houses the abnormality detection system (100).

[0118] This embodiment has the advantage that wiring abnormalities in the wiring (C11) can be easily detected.

[0119] The anomaly detection method according to the thirteenth aspect includes an acquisition step (ST1) and a detection step (ST2). The acquisition step (ST1) is a step of acquiring voltage information related to a voltage applied to a circuit (C1) connected to a distribution board (1). The detection step (ST2) is a step of detecting a wiring anomaly of a wiring (C11) in the circuit (C1) based on the voltage information acquired in the acquisition step (ST1). The detection step (ST2) includes a plurality of determination steps including a first determination step (ST31) and a second determination step (ST32). The first determination step (ST31) is a step of determining that a wiring anomaly has occurred when the voltage information exceeds a threshold value (Th1). The second determination step (ST32) is a step of determining whether or not a wiring anomaly has occurred by a determination method different from that of the first determination step (ST31). The detection step (ST2) detects a wiring anomaly in any one of the plurality of determination steps in response to a predetermined trigger.

[0120] This embodiment has the advantage that wiring abnormalities in the wiring (C11) can be easily detected.

[0121] A program according to a fourteenth aspect causes one or more processors to execute the anomaly detection method according to the thirteenth aspect.

[0122] This embodiment has the advantage that wiring abnormalities in the wiring (C11) can be easily detected.

[0123] The configurations according to the second to eleventh aspects are not essential for the anomaly detection system (100) and can be omitted as appropriate. [Explanation of symbols]

[0124] 100 Anomaly Detection System 1 Distribution board 10 Distribution cabinet 3 Main breaker 711 Acquisition Department 712 Detection unit 714 Shutdown control section C1 circuit C11 Wiring ST1 Acquisition step ST2 Detection step ST31 First judgment step ST32 Second judgment step T1, T2 Judgment period Th1, Th2 thresholds Th3 Predetermined integrated value

Claims

1. an acquisition unit that acquires voltage information related to a voltage applied to a circuit connected to the distribution board; a detection unit that detects a wiring abnormality in a wiring in the circuit based on the voltage information acquired by the acquisition unit, The detection unit is a first determination function for determining that the wiring abnormality has occurred when the voltage information exceeds a first voltage threshold; a second determination function that determines whether or not the wiring abnormality has occurred by a determination method different from the first determination function, Detecting the wiring abnormality by any one of the plurality of determination functions in response to a predetermined trigger; In the second determination function, the detection unit determines whether or not the wiring abnormality has occurred by comparing the voltage information with a plurality of second voltage thresholds, and determines whether or not the wiring abnormality has occurred under different conditions for each threshold; The acquisition unit further acquires current information related to a current flowing through the circuit, The detection unit is When it is determined that the wiring abnormality has occurred by the determination in the first determination function or the determination in the second determination function, it is further determined whether or not a disconnection condition is satisfied; when the voltage information exceeds a third voltage threshold and the current information exceeds a first current threshold, when the voltage information exceeds a fourth voltage threshold that is greater than the third voltage threshold, and when the current information exceeds a second current threshold that is greater than the first current threshold, it is determined that the shut-off condition is satisfied, and it is determined to shut off the circuit in which the wiring abnormality has been detected. Anomaly detection system.

2. In the second determination function, the detection unit determines whether or not the wiring abnormality has occurred based on whether or not the number of times each threshold included in the plurality of second voltage thresholds of the second determination function is exceeded exceeds a predetermined number of times in a predetermined time. The anomaly detection system according to claim 1 .

3. The predetermined time for determining whether or not the wiring abnormality has occurred is variable. The anomaly detection system according to claim 2 .

4. In the second determination function, the detection unit determines whether or not the wiring abnormality has occurred based on whether or not an integrated value of the voltage information exceeds a predetermined integrated value. The anomaly detection system according to any one of claims 1 to 3.

5. When the voltage information satisfies a predetermined condition as the predetermined trigger, the detection unit detects the wiring abnormality using the second determination function. The anomaly detection system according to any one of claims 1 to 4.

6. Further comprising a shutoff control unit that shuts off a branch breaker to which the circuit is connected when the detection unit determines that the circuit is to be shut off. The anomaly detection system according to any one of claims 1 to 5.

7. Further comprising a cutoff control unit that cuts off a main breaker when the detection unit determines that the circuit is to be cut off. The anomaly detection system according to any one of claims 1 to 5.

8. The cutoff control unit restores the circuit in which the current flowing or the power passing therethrough is less than a predetermined value from the cutoff state.

8. The anomaly detection system according to claim 6 or 7.

9. An anomaly detection system according to any one of claims 1 to 8, A distribution board cabinet that houses the anomaly detection system. Distribution board.

10. An acquisition step of acquiring voltage information regarding a voltage applied to a circuit connected to a distribution board; a detection step of detecting a wiring abnormality in the wiring in the circuit based on the voltage information acquired in the acquisition step, The detection step includes: a first determination step of determining that the wiring abnormality has occurred when the voltage information exceeds a first voltage threshold; a second determination step of determining whether or not the wiring abnormality has occurred by a determination method different from that of the first determination step, Detecting the wiring abnormality in any one of the plurality of determination steps in response to a predetermined trigger; In the second determination step, the voltage information is compared with a plurality of second voltage thresholds to determine whether or not the wiring abnormality has occurred, and whether or not the wiring abnormality has occurred is determined under different conditions for each threshold; The acquiring step further includes acquiring current information related to a current flowing through the circuit; In the detection step, When it is determined in the first determination step or the second determination step that the wiring abnormality has occurred, it is further determined whether or not a disconnection condition is satisfied; when the voltage information exceeds a third voltage threshold and the current information exceeds a first current threshold, when the voltage information exceeds a fourth voltage threshold that is greater than the third voltage threshold, and when the current information exceeds a second current threshold that is greater than the first current threshold, it is determined that the shut-off condition is satisfied, and it is determined to shut off the circuit in which the wiring abnormality has been detected. Anomaly detection methods.

11. To one or more processors: Executing the anomaly detection method according to claim 10, program.

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