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

Abstract

To provide an abnormality detection system capable of more diverse detection, a distribution board system, an abnormality detection method and a program.SOLUTION: An abnormality detection system 100 includes a detection unit 33 and an estimation unit 715. The detection unit 33 detects an abnormality of a wiring C11 in a power distribution system 101. The power distribution system 101 supplies the electric power to a load with any one of the multiple phases consisting of a pair of poles out of 3 poles including 3 poles. The estimation unit 715 is configured so as to, when the detection unit 33 detects an occurrence of abnormality, estimate which of the multiple phases is the source of the abnormality based on detection result by the detection unit 33.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure generally relates to an anomaly detection system, a distribution board system, an anomaly detection method, and a program, and more particularly to an anomaly detection system, a distribution board system, an anomaly detection method, and a program for detecting wiring anomalies. [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 an overcurrent protection function and / or an earth leakage protection function. According to the overcurrent protection function, when the main switch or the branch switch detects an overcurrent, the contact unit is forcibly opened. Also, according to the earth leakage protection function, when the main switch or the branch switch detects an earth leakage, the contact unit is forcibly opened. [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] However, in the configuration described in Patent Document 1, the main switch and branch switch only detect predetermined abnormalities such as overcurrent or leakage current, and operate uniformly regardless of the equipment (load) connected to the main switch and branch switch.

[0005] The present disclosure has been made in consideration of the above-mentioned reasons, and aims to provide an anomaly detection system, a distribution board system, an anomaly detection method, and a program capable of more diverse detection. [Means for solving the problem]

[0006] An anomaly detection system according to one aspect of the present disclosure includes a detection unit and an estimation unit. The detection unit detects an anomaly in wiring in a power distribution system. The power distribution system includes three poles, and supplies power to a load through any one of a plurality of phases consisting of a pair of poles among the three poles. When the detection unit detects the occurrence of the anomaly, the estimation unit estimates which of the plurality of phases is the anomaly based on a detection result of the detection unit. Circuit connected to The three poles are a first voltage pole, a second voltage pole, and a neutral pole. The multiple phases include a first phase consisting of the first voltage pole and the neutral pole, a second phase consisting of the second voltage pole and the neutral pole, and a third phase consisting of the first voltage pole and the second voltage pole. The estimation unit estimates the source of the anomaly by distinguishing at least the first phase or the second phase from the third phase. The estimation unit estimates the source of the anomaly when there is a predetermined correlation between the wiring anomaly occurring in the first phase and the wiring anomaly occurring in the second phase. Circuit connected to The predetermined correlation includes an overlap between the occurrence timing of the abnormality in the first phase and the occurrence timing of the abnormality in the second phase. 。

[0007] A distribution board system according to an aspect of the present disclosure includes the abnormality detection system and a plurality of branch breakers, each of which branches at least one of the plurality of phases into a plurality of circuits.

[0008] An anomaly detection method according to an embodiment of the present disclosure includes a detection process and an estimation process. The detection process is a process for detecting an anomaly in wiring in a power distribution system. The power distribution system includes three poles, and supplies power to a load through any one of a plurality of phases each consisting of a pair of the three poles. The estimation process is a process for estimating, when the occurrence of the anomaly is detected, which of the plurality of phases is the anomaly based on a detection result. Circuit connected tois a process for estimating whether one of the three poles is a first voltage pole, a second voltage pole, and a neutral pole. The multiple phases include a first phase consisting of the first voltage pole and the neutral pole, a second phase consisting of the second voltage pole and the neutral pole, and a third phase consisting of the first voltage pole and the second voltage pole. The estimation process estimates the source by distinguishing at least the first phase or the second phase from the third phase. The estimation process estimates the source by distinguishing at least the first phase or the second phase from the third phase when there is a predetermined correlation between the wiring abnormality occurring in the first phase and the wiring abnormality occurring in the second phase. Circuit connected to is estimated to be the source of the abnormality. The predetermined correlation includes an overlap between the occurrence timing of the abnormality in the first phase and the occurrence timing of the abnormality in the second phase. 。

[0009] A program according to one embodiment of the present disclosure is a program for causing one or more processors to execute the anomaly detection method. Effect of the Invention

[0010] The present disclosure has the advantage that a wider variety of detections are possible. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is an explanatory diagram showing a schematic configuration of an anomaly detection system according to a first embodiment and a distribution board system in which the anomaly detection system is used. [Diagram 2] FIG. 2 is an explanatory diagram of the distribution board system as viewed from the front with the lid and cover removed. [Diagram 3] FIG. 3 is a block circuit diagram showing a schematic configuration of a detection unit of the anomaly detection system. [Figure 4] 4A and 4B are explanatory diagrams of the principle of parallel arc generation and the principle of series arc generation, respectively. [Diagram 5]Fig. 5A is a waveform diagram showing an example of a waveform of a current flowing through a wiring when a parallel arc occurs, and Fig. 5B is a waveform diagram showing an example of a waveform of a current flowing through a wiring when a series arc occurs. [Figure 6] FIG. 6 is a flowchart illustrating the operation of the anomaly detection system. [Figure 7] 7A to 7C are schematic explanatory diagrams showing a specific operation example of the anomaly detection system according to the embodiment. [Figure 8] FIG. 8 is a block circuit diagram showing a schematic configuration of a detection unit of the anomaly detection system according to the second embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] (Embodiment 1) (1) Overview An overview of an anomaly detection system 100 according to this embodiment will be described with reference to FIG.

[0013] The anomaly detection system 100 is a system for monitoring the state of wiring C11 of a power distribution system 101. The power distribution system 101 includes a distribution board system 1 and the like, and the distribution board system 1 distributes, for example, power supplied from a power system 20 or the like to a plurality of circuits C1. The wiring C11 is included in the plurality of circuits C1. In other words, each of the plurality of circuits C1 includes the wiring C11.

[0014] In this embodiment, the power distribution system 101 includes at least three poles. As an example, in the case of a single-phase three-wire system, the power distribution system 101 includes three poles, a first voltage pole (L1 pole), a second voltage pole (L2 pole), and a neutral pole (N pole). The power distribution system 101 supplies power to a load in any of a plurality of phases consisting of a pair of poles among the three poles. That is, in the case of a single-phase three-wire system, there are three phases consisting of any pair of poles among the first voltage pole, the second voltage pole, and the neutral pole, namely, the L1-N phase, the L2-N phase, and the L1-L2 phase. The L1-N phase consists of a first voltage pole and a N pole, the L2-N phase consists of a second voltage pole and a N pole, and the L1-L2 phase consists of a first voltage pole and a second voltage pole. The power distribution system 101 supplies power to a load in any of such a plurality of phases.

[0015] In this embodiment, the anomaly detection system 100 is configured to detect an anomaly in the wiring C11 in any of the multiple circuits C1 and perform output according to the detection result. In this way, the anomaly detection system 100 can, for example, notify a user or electrically cut off the circuit C1 when an anomaly occurs in the wiring C11.

[0016] In the present disclosure, the term "wiring abnormality" refers to an abnormality that may occur in the wiring C11 included in the multiple circuits C1, and includes abnormalities such as insulation deterioration or partial disconnection in the wiring C11, for example, if the wiring C11 is a stranded wire, a state in which some of the stranded wires are disconnected. Specifically, the abnormality in the wiring C11 includes, when the wiring C11 is composed of a pair of electric wires (poles), an arc (so-called parallel arc) is generated due to a short circuit between the pair of electric wires. In addition, the abnormality in the wiring C11 includes, when the wiring C11 is composed of a pair of electric wires (poles), an arc (so-called series arc) is generated due to a partial disconnection of one of the pair of electric wires. In addition, for example, a state in which an overcurrent or short-circuit current exceeding a rated current flows in the wiring C11, or a state in which a leakage current occurs in the wiring C11, etc. are also included in the abnormality in the wiring C11. In the present embodiment, as an example, it is assumed that the "wiring abnormality" is at least one of a parallel arc (short circuit) and a series arc (partial disconnection) in the wiring C11.

[0017] In this embodiment, the anomaly detection system 100 is housed in a distribution board cabinet 10 (see FIG. 2) of the distribution board system 1. That is, the anomaly detection system 100 is included in the distribution board system 1. A main breaker 3 and a plurality of branch breakers 4 are housed in the distribution board cabinet 10. In other words, the distribution board system 1 according to this embodiment includes the anomaly detection system 100 and a plurality of branch breakers 4. The plurality of branch breakers 4 are inserted into a plurality of circuits C1, respectively. In this embodiment, the plurality of branch breakers 4 are controlled by a control unit 713 described later. Furthermore, in this embodiment, the plurality of branch breakers 4 branch at least one of a plurality of phases (in the power distribution system 101) into a plurality of circuits C1. As an example, if the power distribution system 101 is a single-phase three-wire system that includes three phases: L1-N phase, L2-N phase, and L1-L2 phase, at least one of these phases (e.g., L1-N phase) is branched into multiple circuits C1 by multiple branch breakers 4.

[0018] 1, the anomaly detection system 100 according to the present embodiment includes a detection unit 33 and an estimation unit 715. The detection unit 33 detects an anomaly in the wiring C11 in the power distribution system 101. The power distribution system 101 supplies power to a load (electrical devices 23, 24, etc.) through any one of a plurality of phases including three poles and each of which is a pair of poles among the three poles. When the detection unit 33 detects the occurrence of an anomaly, the estimation unit 715 estimates which of the plurality of phases is the source of the anomaly based on the detection result of the detection unit 33.

[0019] In the present disclosure, the "origin of anomaly" refers to a location where an anomaly occurs when the detection unit 33 detects an anomaly in the wiring C11. In the present embodiment, the estimation unit 715 estimates which of the multiple phases is the "origin of anomaly", so that the "origin of anomaly" is estimated on a "phase" basis. As an example, in a case where the power distribution system 101 is a single-phase three-wire system including three phases, L1-N phase, L2-N phase, and L1-L2 phase, if an anomaly occurs in the wiring C11 of the L1-N phase, the L1-N phase becomes the "origin of anomaly".

[0020] That is, the anomaly detection system 100 according to the present embodiment includes, in addition to the detection unit 33 that detects an anomaly in the wiring C11, an estimation unit 715 that estimates which of the multiple phases is the source of the anomaly. That is, in the anomaly detection system 100, when an anomaly occurs in the wiring C11, not only the occurrence of the anomaly is detected, but also it is possible to estimate which of the multiple phases included in the power distribution system 101 the anomaly occurs in. Therefore, even when a similar anomaly occurs in the wiring C11, it is possible to take different measures depending on, for example, when the source of the anomaly is the L1-N phase, the L2-N phase, or the L1-L2 phase. In this way, the anomaly detection system 100 has the advantage of being able to detect a wider variety of anomalies.

[0021] (2) Composition The configurations of the anomaly detection system 100 and the distribution board system 1 according to this embodiment will be described in further detail below.

[0022] (2.1) Premise The distribution board system 1 including the anomaly detection system 100 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 system 1 is installed is not limited to each dwelling unit of a detached house or an apartment building, and may be a non-residential facility (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 system 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] The "circuit" in this disclosure is a circuit including wiring C11 that is the target of abnormality detection by the detection unit 33, and may include, for example, a plurality of branch breakers 4 installed inside the distribution board system 1. The circuit C1 may also include an outlet 22 or an electric device 24 electrically connected to the secondary side of the branch breaker 4, or an electric device 23 directly and electrically connected to the secondary side of the branch breaker 4. Hereinafter, a device having a function of breaking the circuit (circuit C1), such as the branch breaker 4, is also referred to as a "switch 2."

[0025] For example, when a main breaker 3 and a plurality of branch breakers 4 are included in a distribution board cabinet 10 of a distribution board system 1, the power of a main line connected to a secondary terminal T2 of the main breaker 3 is distributed to a plurality of branch circuits in the distribution board system 1. In the present disclosure, a "branch circuit" means an individual circuit C1 that is electrically connected to the main line and is branched into a plurality of circuits in the distribution board system 1. Such a branch circuit includes a branch breaker 4, wiring C11, wiring devices (such as a switch device or a receptacle (outlet)), and electrical devices 23 and 24. The circuit C1 may be a main line connected to the secondary terminal T2 of the main breaker 3, or each of the plurality of branch circuits. In the present embodiment, as an example, a case where each of the plurality of branch circuits is a circuit C1 will be described.

[0026] In addition, the "interruption" of the circuits C1 and the like in this disclosure means to electrically interrupt, that is, to stop the supply of power. For example, a state in which a part of the circuits C1 is interrupted means a state in which the supply of power to the part of the circuits C1 is stopped. Conversely, a state in which the circuits C1 are not interrupted means that the circuits C1 are in a conducting state. The interruption is performed by a switch 2 such as a branch breaker 4. In other words, if the circuit C1 is connected to a power source such as a system power source 20 via the switch 2, it is not interrupted when the switch 2 is on (conducting), and is interrupted when the switch 2 is off (non-conducting).

[0027] (2.2) Overall structure Next, the configurations of the anomaly detection system 100 and the distribution board system 1 according to this embodiment will be described with reference to FIGS. 1, 2, and 3. FIG.

[0028] As described above, the distribution board system 1 according to this embodiment includes the anomaly detection system 100 and a plurality of branch breakers 4. In this embodiment, the distribution board system 1 further includes a distribution board cabinet 10 that houses the plurality of branch breakers 4 and the like. In this embodiment, the anomaly detection system 100 is mainly composed of a monitoring unit 7 and a detection unit 33 housed in the distribution board cabinet 10.

[0029] As shown in FIG. 2, the distribution board cabinet 10 accommodates a main breaker 3, a plurality of branch breakers 4, a seismic breaker 5, a grid-connection breaker 6, a detection unit 33, a monitoring unit 7, a current measuring device 8, and a backup power supply 9 (see FIG. 1). Here, each of the plurality of branch breakers 4 constitutes a switch 2 for switching between energization and cutoff for each of the plurality of circuits C1. It is not essential that the distribution board cabinet 10 accommodates the detection unit 33, the monitoring unit 7, the current measuring device 8, and the backup power supply 9. At least a part of the detection unit 33, the monitoring unit 7, the current measuring device 8, and the backup power supply 9 may be located outside the distribution board cabinet 10. In addition, the main breaker 3, the seismic breaker 5, and the grid-connection breaker 6 are not essential components for the distribution board system 1 equipped with the anomaly detection system 100, and at least one of the main breaker 3, the seismic breaker 5, and the grid-connection breaker 6 may be omitted as appropriate.

[0030] 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, for example.

[0031] 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. 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.

[0032] 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-connected breaker 6, a detection unit 33, 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-connected breaker 6, the detection unit 33, the monitoring unit 7, and the current measuring device 8 are attached to the body 11 directly or via mounting parts or the like. FIG. 2 shows the arrangement of the main breaker 3, the plurality of branch breakers 4, the seismic breaker 5, the grid-connected breaker 6, the detection unit 33, 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.

[0033] 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 the primary side terminal T1 and the secondary side terminal T2. 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 contacts 31. The main breaker 3 may also have a limiter function that opens the contacts 31 when a current that exceeds a predetermined limit value flows.

[0034] As shown in Fig. 2, a single-phase three-wire incoming line CB1 of the system power supply 20 is electrically connected to a primary terminal T1 of the main breaker 3. A conductive bar CB21 (see Fig. 3) of a first voltage pole (L1 pole), a conductive bar CB22 (see Fig. 3) of a second voltage pole (L2 pole), and a conductive bar CB20 (see Fig. 3) of a neutral pole (N pole) in the single-phase three-wire wiring are connected to a secondary terminal T2 of the main breaker 3.

[0035] In this embodiment, the power distribution system 101 is a single-phase three-wire system that includes three poles, a first voltage pole (L1 pole), a second voltage pole (L2 pole), and a neutral pole (N pole), and has conductive bars CB21, CB22, and CB20 for each pole. The power distribution system 101 supplies power to a load (electrical devices 23, 24, etc.) through any one of a plurality of phases consisting of a pair of poles among the three poles.

[0036] That is, in the case of a single-phase three-wire system, there are three phases, namely, a first phase (L1-N phase), a second phase (L2-N phase), and a third phase (L1-L2 phase), each of which is composed of a pair of poles selected from the first voltage pole, the second voltage pole, and the neutral pole. That is, the first phase (L1-N phase) is composed of a first voltage pole and an N pole, the second phase (L2-N phase) is composed of a second voltage pole and an N pole, and the third phase (L1-L2 phase) is composed of a first voltage pole and a second voltage pole. A 100V circuit is connected to each of the first phase (L1-N phase) and the second phase (L2-N phase), and a 200V circuit is connected to the third phase (L1-L2 phase). Each of the conductive bars CB21, CB22, and CB20 is formed into a long plate shape that is long in the left-right direction by a conductive member, and is disposed in the center of the top-bottom direction inside the distribution board cabinet 10, and to the right of the main breaker 3.

[0037] The branch breakers 4 are arranged in a left-right direction on the upper and lower sides of each of the conductive bars CB21, CB22, and CB20. In this embodiment, as shown in Fig. 2, twelve branch breakers 4 are arranged in a left-right direction on the upper side of each of the conductive bars CB21, CB22, and CB20. Ten branch breakers 4 are arranged in a left-right direction on the lower side of each of the conductive bars CB21, CB22, and CB20.

[0038] 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.

[0039] The branch breaker 4 includes a 100V type included in the 100V circuit and a 200V type included in the 200V circuit. A pair of primary side terminals of the 100V branch breaker 4 are electrically connected to one of the conductive bar CB21 of the first voltage pole and the conductive bar CB22 of the second voltage pole, and to the conductive bar CB20 of the neutral pole. As a result, the 100V circuit is classified as the first phase (L1-N phase) or the second phase (L2-N phase). That is, the 100V circuit is included in the first phase or the second phase. A pair of primary side terminals of the 200V branch breaker 4 are electrically connected to the conductive bar CB21 of the first voltage pole and the conductive bar CB22 of the second voltage pole, respectively. As a result, the 200V circuit is classified as the third phase (L1-L2 phase). That is, the 200V circuit is included in the third phase. Further, a corresponding wiring C11 is electrically connected to the secondary terminal of the branch breaker 4. For example, one or more electrical devices 23 such as lighting fixtures and hot water supply equipment, and wiring devices such as outlets 22 (see FIG. 1) and wall switches are connected as loads to the wiring C11 connected to the secondary terminal of each branch breaker 4. Therefore, the distribution board system 1 can supply power to the electrical devices 23 connected to the secondary terminal of the branch breaker 4 via the wiring C11, or the electrical devices 24 (for example, air conditioners or television sets) connected to the outlets 22.

[0040] Moreover, the branch breaker 4 serving as the switch 2 includes a detection unit 202 (see FIG. 1) and a breaker unit 203 (see FIG. 1). The breaker unit 203 is built into the branch breaker 4 and includes a contact electrically connected between a primary side terminal and a secondary side terminal in the branch breaker 4. The breaker unit 203 opens and closes this contact by, for example, electromagnetic drive. The breaker unit 203 electrically separates the secondary side terminal from the primary side terminal in the branch breaker 4 by at least opening the contact. In this way, the breaker unit 203 opens the contact, so that the branch breaker 4 is turned off (non-conductive), and the circuit C1 including this branch breaker 4 is broken. Conversely, the breaker unit 203 electrically connects the primary side terminal and the secondary side terminal in the branch breaker 4 by closing the contact.

[0041] The detection unit 202 detects an abnormal state in which an overcurrent such as a short circuit current or an overload current flows. When the detection unit 202 detects an abnormal state in which an overcurrent flows through the contacts of the interrupter 203, the branch breaker 4 drives the interrupter 203 to open the contacts. In this way, when an abnormal state such as an overcurrent occurs, the branch breaker 4 cuts off the power supply to the secondary side circuit of the branch breaker 4 to protect the circuit. The detection unit 202 may also have a function of detecting a leakage state of the wiring C11 connected to the branch breaker 4. In this case, when the detection unit 202 detects the occurrence of a leakage current, the branch breaker 4 opens the contacts.

[0042] Here, the switch 2 (branch breaker 4) further includes a communication unit 201. The communication unit 201 is configured to be able to communicate with a communication unit 72 (described later) of the monitoring unit 7. In the present disclosure, "capable of communication" means that signals can be exchanged directly or indirectly via a network or a repeater, etc., by an appropriate communication method such as wired communication or wireless communication. That is, the switch 2 (communication unit 201) and the monitoring unit 7 (communication unit 72) can exchange signals with each other. Here, each of the multiple switches 2 is set with a unique address. That is, the communication unit 201 communicates with the monitoring unit 7 using an address (an address stored in a memory, etc.) set in the switch 2.

[0043] In this embodiment, the communication unit 201 and the monitoring unit 7 are capable of bidirectional communication with each other, and both transmission of signals from the communication unit 201 to the monitoring unit 7 and transmission of signals from the monitoring unit 7 to the communication unit 201 are possible.

[0044] Moreover, in this embodiment, the communication unit 201 uses the substrate 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 substrate constitutes 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 substrate can be appropriately wired communication conforming to a communication standard such as RS-485 or a wired LAN (Local Area Network).

[0045] In this manner, in the switch 2 (branch breaker 4) equipped with the communication unit 201 and the cutoff unit 203, it is possible to open and close the contacts of the cutoff unit 203 in response to a control signal received by the communication unit 201. Therefore, the switch 2 (branch breaker 4) can, for example, be remotely controlled to cut off the circuit C1 by causing the cutoff unit 203 to open the contacts, or to energize the circuit C1 by causing the cutoff unit 203 to close the contacts.

[0046] The seismic breaker 5 is arranged below the conductive bars CB21, CB22, and CB20 so as to be aligned in the left-right direction with the branch breaker 4. 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 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.

[0047] 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 bars CB21, CB22, and CB20 electrically connected to the secondary terminal T2 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 interconnection breaker 6 detects the occurrence of a leakage current by the detection function, 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 in this case, the interconnection breaker 6 may be configured to perform a cutoff operation when the interconnection breaker 6 detects an overcurrent.

[0048] The current measuring device 8 is configured to measure the current flowing through the loads (electrical devices 23, 24, etc.) electrically 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 bars CB21, CB22, CB20 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 system 1 is installed.

[0049] 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, for example, the primary side of the main breaker 3 to charge the battery 91. For example, 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, i.e., from the system power supply 20.

[0050] The monitoring unit 7 has a measurement function for measuring at least one of the current and the power of a plurality of branch circuits (circuits C1), and a communication function with a controller 25 arranged outside the distribution board cabinet 10.

[0051] The detection unit 33 detects an abnormality in the wiring C11 in the power distribution system 101. In this embodiment, the detection unit 33 is separate from the monitoring unit 7 and constitutes a unit separate from the monitoring unit 7. The detection unit 33 has a communication function with the monitoring unit 7 and is configured to be able to output (transmit) the detection result to the monitoring unit 7.

[0052] Since the detection unit 33 and the monitoring unit 7 are the main components of the anomaly detection system 100, details of the configuration of the detection unit 33 and the monitoring unit 7 related to the anomaly detection system 100 will be explained in the section “(2.3) Configuration of the anomaly detection system.”

[0053] The controller 25 controls or monitors devices compatible with a Home Energy Management System (HEMS) (hereinafter referred to as HEMS-compatible devices). Here, the HEMS-compatible devices include, for example, smart meters, solar power generation devices, power storage devices, fuel cells, electric vehicles, air conditioners, lighting fixtures, hot water heaters, refrigerators, electric curtains, electric shutters, and television receivers. The HEMS-compatible devices are not limited to these devices. In this embodiment, the electrical devices 23 and 24 are both configured to be able to communicate with the controller 25 as HEMS-compatible devices.

[0054] The monitoring unit 7 is also configured to be able to communicate with a management server 300 outside the facility 500. The monitoring unit 7 is connected to a network 200 such as the Internet directly or indirectly via a router or the like, and is able to communicate with the management server 300 via the network 200. This allows the monitoring unit 7 to communicate not only with the management server 300, but also with an information terminal 400 or the like connected to the network 200. The information terminal 400 is, for example, a mobile terminal such as a smartphone or tablet terminal owned by a resident (user) of the facility 500.

[0055] The communication between the management server 300 or the information terminal 400 and the monitoring unit 7 may be performed, for example, via the controller 25. That is, by connecting the controller 25 to the network 200, the monitoring unit 7 becomes able to communicate with the management server 300 or the information terminal 400 connected to the network 200 via the controller 25.

[0056] In the distribution board system 1 according to this embodiment, the monitoring unit 7 receives from the current measuring device 8 the current value flowing through each of the multiple branch circuits (circuits C1) measured by the current measuring device 8. Furthermore, the monitoring unit 7 receives from the main current measuring device the current value measured by the main current measuring device, which measures the current flowing through the main breaker 3. The monitoring unit 7 converts each of the current measuring device 8 and the current value measured by the main current measuring device into a power value (instantaneous power value). The monitoring unit 7 has a function of calculating data on the amount of power obtained by integrating collected instantaneous power data over a predetermined period of time. Therefore, the controller 25 can control or monitor the HEMS-compatible devices based on the instantaneous power and the amount of power in each of the multiple branch circuits.

[0057] The monitoring unit 7 also has a function (communication function) of communicating with at least one of the solar power generation device, the power storage device, and the power conversion device electrically connected to the electric vehicle. The power conversion device may be configured to perform power conversion for one-way charging from the distribution board system 1 to the electric vehicle, as well as to perform bidirectional power conversion so as to be used for both charging and discharging the storage battery of the electric vehicle.

[0058] The monitoring unit 7 also has a communication function with at least one of a gas meter and a water meter. The communication method between the monitoring unit 7 and the photovoltaic power generation device, the power storage device, and the power conversion device is, for example, wired communication conforming to a communication standard such as RS-485. The communication method between the monitoring unit 7 and the gas meter and the water meter is not limited to wired communication, and may be wireless communication. The monitoring unit 7 may be capable of communicating with, for example, a storage-type hot water supply device.

[0059] (2.3) Configuration of anomaly detection system Next, the configuration of the anomaly detection system 100 will be described with reference to FIGS.

[0060] As already described, in this embodiment, the anomaly detection system 100 mainly includes the detection unit 33 and the monitoring unit 7 housed in the distribution board cabinet 10. Therefore, hereinafter, the anomaly detection system 100 will be described together with the detection unit 33 and the monitoring unit 7.

[0061] First, as shown in FIG. 2, the detection unit 33 is disposed on the right side of the main breaker 3 inside the distribution board cabinet 10. The detection unit 33 is disposed below the conductive bars CB21, CB22, and CB20 so as to be aligned in the left-right direction with the branch breaker 4. As an example, the detection unit 33 has a size and appearance similar to that of the branch breaker 4 or the earthquake-sensitive breaker 5. As shown in FIG. 3, the detection unit 33 is electrically connected to the conductive bar CB21 of the first voltage pole (L1 pole), the conductive bar CB22 of the second voltage pole (L2 pole), and the conductive bar CB20 of the neutral pole (N pole). As a result, the detection unit 33 is electrically connected to a plurality of phases, namely, the first phase (L1-N phase), the second phase (L2-N phase), and the third phase (L1-L2 phase).

[0062] In this embodiment, the detection unit 33 detects an abnormality in the wiring C11 based on voltage information related to voltages V1 and V2 applied to each of the multiple phases. Here, as an example, the detection unit 33 uses the voltage at the secondary terminal T2 of the main breaker 3 as voltage information related to the voltages applied to each of the first phase (L1-N phase), second phase (L2-N phase), and third phase (L1-L2 phase) in the power distribution system 101. As an example, the detection unit 33 detects an abnormality in the wiring C11 using information related to the voltages V1 and V2 between the conductive bars CB21, CB22, and CB20 electrically connected to the secondary terminal T2 of the main breaker 3 as voltage information.

[0063] Specifically, as shown in FIG. 3, the detection unit 33 has detection circuits 331 provided in two or more of the multiple phases. In this embodiment, the detection unit 33 has two detection circuits 331, and the detection circuits 331 are provided for the first and second phases out of the three phases, the first phase (L1-N phase), the second phase (L2-N phase), and the third phase (L1-L2 phase). The detection circuits 331 are inserted between a pair of poles constituting each phase out of the three poles (first voltage pole, second voltage pole, and neutral pole). Here, the detection circuit 331 provided in the first phase (L1-N phase) is inserted between the conductive bar CB21 of the first voltage pole (L1 pole) and the conductive bar CB20 of the neutral pole (N pole). The detection circuit 331 provided in the second phase (L2-N phase) is inserted between the conductive bar CB22 of the second voltage pole (L2 pole) and the conductive bar CB20 of the neutral pole (N pole).

[0064] Each detection circuit 331 includes a CR circuit which is a series circuit of a capacitor 335 and a resistor 334 which is a measured part. That is, the detection circuit 331 has a series circuit of the capacitor 335 and the resistor (measured part) 334 which are electrically connected between a pair of poles (a first voltage pole and a neutral pole, or a second voltage pole and a neutral pole) which constitute each phase. The detection circuit 331 provided in the first phase (L1-N phase) has a series circuit of the capacitor 335 and the resistor (measured part) 334 which are electrically connected between the first voltage pole and the neutral pole which constitute the first phase. The detection circuit 331 provided in the second phase (L2-N phase) has a series circuit of the capacitor 335 and the resistor (measured part) 334 which are electrically connected between the second voltage pole and the neutral pole which constitute the second phase.

[0065] The detection unit 33 further includes a measurement circuit 332 that measures a voltage generated in the resistor 334, and a determination circuit 333 that determines the presence or absence of an abnormality in the wiring C11 based on the measurement result of the measurement circuit 332. In this embodiment, the detection unit 33 includes two measurement circuits 332, and the measurement circuits 332 are connected to the detection circuit 331 provided in the first phase (L1-N phase) and the detection circuit 331 provided in the second phase (L2-N phase). The measurement circuit 332 connected to the detection circuit 331 on the first phase (L1-N phase) side measures a voltage corresponding to the voltage V1 applied to the first phase. The measurement circuit 332 connected to the detection circuit 331 on the second phase (L2-N phase) side measures a voltage corresponding to the voltage V2 applied to the second phase.

[0066] Here, the abnormality of the wiring C11 that is the object of judgment by the judgment circuit 333 is an "arc fault" consisting of at least one of a parallel arc (short circuit) and a series arc (partial disconnection) in the wiring C11. The judgment circuit 333 judges the presence or absence of an abnormality (arc fault) in the wiring C11 by comparing the absolute value of the peak value of the voltage generated between both ends of the resistor 334 with a predetermined threshold value. This threshold value is set to a voltage value that is higher than the peak value (absolute value) of the voltage generated between both ends of the resistor 334 when no arc fault occurs in the circuit C1 and is lower than the peak value (absolute value) of the voltage generated between both ends of the resistor 334 when an arc fault occurs.

[0067] Here, since the detection circuit 331 connected in parallel to the circuit C1 between a pair of poles constituting each phase is composed of a CR circuit, which is a series circuit of a capacitor 335 and a resistor 334, the impedance of the detection circuit 331 decreases as the frequency increases. When no arc fault occurs in the circuit C1 and an AC current having a frequency similar to that of the system power supply 20 (for example, 50 or 60 Hz) flows through the circuit C1, the cutoff frequency of the CR circuit is set so that almost no current flows through the detection circuit 331.

[0068] When no arc fault occurs in the circuit C1, a relatively low-frequency AC current (approximately the same frequency as the frequency of the system power supply 20) flows through the circuit C1. Therefore, almost no current flows through the detection circuit 331, and the peak value (absolute value) of the voltage across the resistor 334 measured by the measurement circuit 332 is lower than the threshold value, so that the determination circuit 333 determines that no arc fault occurs in the circuit C1.

[0069] On the other hand, when an arc fault occurs in the circuit C1, a high-frequency current flows between the pair of poles to which the circuit C1 is connected, and therefore a high-frequency current flows in the detection circuit 331. Therefore, the peak value (absolute value) of the voltage across the resistor 334 measured by the measurement circuit 332 becomes equal to or greater than the threshold value, and the determination circuit 333 determines that an arc fault has occurred in the circuit C1.

[0070] The determination circuit 333 determines that an arc fault has occurred when the peak value (absolute value) of the voltage across resistor 334 measured by measurement circuit 332 becomes equal to or greater than a threshold value, but the present invention is not limited to this configuration. For example, the determination circuit 333 may determine that an arc fault has occurred when a state in which the peak value (absolute value) of the voltage across resistor 334 becomes equal to or greater than the threshold value occurs a predetermined number of times or more within a predetermined time. This reduces the possibility that the determination circuit 333 will erroneously detect an arc fault when the peak value (absolute value) of the voltage across resistor 334 becomes equal to or greater than the threshold value due to noise or the like.

[0071] In this embodiment, as described above, the detection unit 33 has two detection circuits 331 and two measurement circuits 332 corresponding to two phases, the first phase (L1-N phase) and the second phase (L2-N phase). Therefore, the determination circuit 333 can determine the presence or absence of an abnormality (arc fault) in the wiring C11 in any circuit C1 included in the first phase from the measurement value (voltage across the resistor 334) of the measurement circuit 332 connected to the detection circuit 331 on the first phase side. On the other hand, the determination circuit 333 can determine the presence or absence of an abnormality (arc fault) in the wiring C11 in any circuit C1 included in the second phase from the measurement value (voltage across the resistor 334) of the measurement circuit 332 connected to the detection circuit 331 on the second phase side. Therefore, the determination circuit 333 can determine the presence or absence of an abnormality (arc fault) in the wiring C11 for the two phases, the first phase and the second phase, individually.

[0072] Thus, in this embodiment, the detection unit 33 can detect at least the occurrence of an arc (arc fault) as an abnormality in the wiring C11. Specifically, the detection unit 33 can determine whether or not an arc is occurring 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 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 33 can determine whether or not an arc is occurring in the wiring C11 of the circuit C1.

[0073] As already mentioned, there are two types of arcs that can occur in the wiring C11: a parallel arc and a series arc. Parallel arcs and series arcs will be briefly described below with reference to Figures 4A to 5B. Figures 5A and 5B show examples of current waveforms that flow through the wiring C11 when a parallel arc and a series arc occur, respectively, with the horizontal axis representing time and the vertical axis representing current.

[0074] A parallel arc may occur, for example, as shown in FIG. 4A, when the conductors of a pair of electric wires C10 constituting the wiring C11 come into contact with each other and short circuit. A dotted arrow I1 in FIG. 4A typically represents a path of a current flowing through the wiring C11 when a parallel arc occurs. The magnitude of the current flowing through the wiring C11 when a parallel arc occurs is, for example, several tens [A] to several hundreds [A]. A parallel arc may occur, for example, when the wiring C11 is caught on an edge of an object (such as furniture) in the facility 500, causing damage to the coating C12, 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, causing the coating C12 to melt, or when an animal bites the wiring C11, causing damage to the coating C12. A parallel arc may also occur when the insulation of the coating C12 deteriorates due to the wiring C11 being continuously exposed to ultraviolet rays for a long period of time.

[0075] 5A shows an example of a waveform of a current flowing through the wiring C11 when a parallel arc occurs. As shown in FIG. 5A, when a parallel arc occurs, a pulse current flows intermittently through the wiring C11. In other words, when a parallel arc occurs, the waveform of the current flowing through the wiring C11 includes a unique pattern associated with the occurrence of a parallel arc.

[0076] A series arc may occur, for example, as shown in FIG. 4B, when one of a pair of electric wires C10 constituting the wiring C11 is partially broken. A dotted arrow I2 in FIG. 4B typically represents a path of a current flowing through the wiring C11 when a series arc occurs. The magnitude of the current flowing through the wiring C11 when a series arc occurs is several [A] to 30 [A]. Therefore, the magnitude of the current flowing through the wiring C11 when a series arc occurs may be smaller than the magnitude of the current flowing through a load (e.g., electrical devices 23, 24) connected to the wiring C11 during normal operation when no abnormality occurs. A series arc may occur, for example, when the wiring C11 is repeatedly bent or when the wiring C11 is pulled with excessive force.

[0077] Fig. 5B shows an example of a waveform of a current flowing through the wiring C11 when a series arc occurs. As shown in Fig. 5B, when a series arc occurs, a current flows through the wiring C11 in which a high-frequency component specific to a series arc is superimposed on a current supplied to a load (e.g., electrical devices 23, 24). In other words, the current flowing through the wiring C11 when a series arc occurs may include a high-frequency component specific to a series arc as shown in Fig. 5B.

[0078] Here, the detection unit 33 detects an abnormality based on a monitoring target consisting of one or more physical quantities related to the circuit C1. That is, in this embodiment, as described above, the detection unit 33 detects an abnormality in the wiring C11 based on voltage information related to the voltage applied to each of the multiple phases. Since the voltage applied to each phase is a physical quantity related to the circuit C1, in this embodiment, the voltages applied to at least the multiple circuits C1 are included in the monitoring target. In addition, the detection unit 33 can detect an abnormality in the wiring C11 based on the monitoring target by monitoring not only the voltage but also one or more physical quantities related to the circuit C1.

[0079] Other than voltage, physical quantities that can be monitored include, for example, current, temperature, color, sound, odor, or deformation. That is, when an abnormality such as the above-mentioned arc (parallel arc or series arc) occurs in the wiring C11 of the circuit C1, some characteristics may appear in physical quantities other than voltage. As an example, in a circuit C1 in which this type of abnormality in the wiring C11 occurs, the waveform of the current flowing through the wiring C11 may include a unique pattern associated with the occurrence of the abnormality. Also, in a circuit C1 in which this type of abnormality in the wiring C11 occurs, for example, due to heat generation or the like of the wiring C11, the wiring C11 may include unique characteristics in temperature change, color change (discoloration), sound (vibration sound, etc.), odor, deformation, etc.

[0080] Therefore, the detection unit 33 may detect an abnormality based on a monitoring target consisting of a physical quantity other than voltage, together with or instead of voltage, using the output of, for example, a temperature sensor, an image sensor, an odor sensor, or other physical quantity sensor. In this way, the physical quantity to be monitored used by the detection unit 33 may include not only voltage, but also physical quantities other than voltage, such as current, temperature, color, sound, odor, or deformation.

[0081] Furthermore, in this embodiment, the detection unit 33 determines that an abnormality has occurred in the wiring C11 only when the state in which the monitored object exhibits an abnormality as described above continues for a certain detection time. In other words, if the state in which the monitored object, such as the current flowing through the circuit C1, exhibits an abnormality is resolved before the detection time is reached, the detection unit 33 does not determine that an abnormality has occurred in the wiring C11. As a result, the detection unit 33 is less likely to erroneously determine that an abnormality has occurred in the wiring C11 when, for example, a state in which the monitored object exhibits an abnormality occurs for only an instant due to the influence of noise or the like, thereby improving the detection accuracy of an abnormality in the wiring C11.

[0082] Next, regarding the placement of the monitoring unit 7, the monitoring unit 7 is placed, for example, inside the distribution board cabinet 10 on the left side of the main breaker 3 (see FIG. 2). The monitoring unit 7 operates by receiving power from the primary side of the main breaker 3, so it can operate even if the main breaker 3 performs a cutoff operation. 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.

[0083] The monitoring unit 7 is electrically connected to a current measuring device 8. Furthermore, a main current measuring device that measures the current flowing through the main breaker 3 is electrically connected to the monitoring unit 7. The monitoring unit 7 has a function (measurement function) of calculating a power value based on the current value measured by the current measuring device 8 and the main current measuring device. Since the current measuring device 8 measures the current flowing through each of the multiple branch circuits, the monitoring unit 7 measures at least one of the current and power of each branch circuit based on the current value measured by the current measuring device 8.

[0084] As described above, the monitoring unit 7 has a function (communication function) of communicating with the controller 25 configured to control or monitor the HEMS-compatible devices. In this embodiment, as described above, the electric devices 23 and 24 are both configured as HEMS-compatible devices and capable of communicating with the controller 25. That is, the electric devices 23 and 24 are both targets of control or monitoring by the controller 25.

[0085] The communication method between the monitoring unit 7 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 monitoring unit 7 and the controller 25 may be wired communication conforming to a communication standard such as a wired LAN. The communication protocol in the communication between the monitoring unit 7 and the controller 25 is, for example, Ethernet (registered trademark), ECHONET Lite (registered trademark), or the like. As with the communication method between the monitoring unit 7 and the controller 25, an appropriate communication method can be adopted for the communication method between the controller 25 and the HEMS-compatible devices (including the electrical devices 23 and 24). As described above, the monitoring unit 7 can indirectly communicate with the HEMS-compatible devices (the electrical devices 23 and 24) via the controller 25.

[0086] In this embodiment, bidirectional communication is possible between the monitoring unit 7 and the controller 25, and between the monitoring unit 7 and the management server 300 or the information terminal 400. Therefore, for example, a signal can be transmitted from the monitoring unit 7 to the HEMS-compatible device via the controller 25, and conversely, a signal can be transmitted from the HEMS-compatible device to the monitoring unit 7 via the controller 25.

[0087] As described above, the monitoring unit 7 can also communicate with the management server 300 or the information terminal 400 via the network 200. Bidirectional communication is also possible between the monitoring unit 7 and the management server 300 or the information terminal 400.

[0088] More specifically, the monitoring unit 7 includes an information processing unit 71, a communication unit 72, a presentation unit 73, and a storage unit 74, as shown in FIG.

[0089] The information processing unit 71 includes, for example, a computer system. The computer system is mainly composed of one or more processors and one or more memories as hardware. The functions of the information processing unit 71 are realized by the one or more processors executing a program recorded in one or more memories of the computer system. The program may be recorded in advance 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 is readable by the computer system.

[0090] The information processing unit 71 includes the functions of a measurement unit 711 , an acquisition unit 712 , a control unit 713 , a notification unit 714 , and an estimation unit 715 .

[0091] The measurement unit 711 measures the power passing through at least one of the main breaker 3 and the branch breaker 4 in the distribution board system 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 measurement 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. Furthermore, the measurement unit 711 receives the current value measured by the main current measurement device (i.e., the current value flowing through the main line) from the main current measurement device. The measurement 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). In addition, the measurement unit 711 has a function of calculating power amount data obtained by integrating the collected instantaneous power data over a predetermined period of time.

[0092] The acquisition unit 712 acquires the detection result of the detection unit 33. That is, since the detection unit 33 is separate from the monitoring unit 7, the acquisition unit 712 of the monitoring unit 7 acquires the detection result output (transmitted) from the detection unit 33. In this embodiment, since the detection unit 33 has a communication function with the monitoring unit 7, the acquisition unit 712 acquires the detection result transmitted from the determination circuit 333 of the detection unit 33 through communication. As a result, the monitoring unit 7 can acquire the detection result of an abnormality (arc fault) in the wiring C11 in the power distribution system 101 from the detection unit 33.

[0093] In addition, as an example in the present embodiment, the detection result of the detection unit 33 acquired by the acquisition unit 712 is transmitted from the notification unit 714 to the information terminal 400. Furthermore, the detection result of the detection unit 33 acquired by the acquisition unit 712 is written in the storage unit 74 by the notification unit 714.

[0094] The control unit 713 controls each of the multiple switches 2 (branch breakers 4). In this embodiment, the control unit 713 cuts off the power supply when the detection unit 33 detects the occurrence of an abnormality. The control unit 713 performs the cutoff based on an estimation result of the estimation unit 715 described later. For example, the control unit 713 cuts off the power supply to the circuit C1 including the switch 2 by cutting off the switch 2 (branch breaker 4) based on the estimation result of the estimation unit 715.

[0095] In the present embodiment, as an example, when controlling the circuit C1, the control unit 713 outputs a control signal for controlling the circuit C1 to the circuit C1. This allows the control unit 713 to control each of the multiple circuits C1. In the present disclosure, "control of the circuit C1" may include cutting off and restoring the power supply to the circuit C1, limiting the current flowing through the circuit C1, and controlling the electric devices 23 and 24 included in the circuit C1.

[0096] As an example, the control unit 713 controls each of the multiple switches 2 by transmitting a control signal to the communication unit 201 of the switch 2 according to the detection result of the detection unit 33, and switches between energization and cut-off of each of the multiple circuits C1. That is, the control unit 713 outputs a control signal to the switch 2 (communication unit 201) included in any of the circuits C1 to open the contacts (cut-off unit 203) built into the switch 2, and can cut off the power supply to the circuit C1. The control unit 713 also outputs a control signal to the electric devices 23, 24 included in any of the circuits C1 directly or via the controller 25, and can control the electric devices 23, 24.

[0097] The notification unit 714 notifies the user. The notification unit 714 notifies when the detection unit 33 detects the occurrence of an abnormality. The notification unit 714 notifies based on the estimation result of the estimation unit 715 described later. Here, as an example, when notifying the detection result of the detection unit 33, the notification unit 714 transmits the detection result of the detection unit 33 to the information terminal 400, so that the information terminal 400 presents the detection result to the user. As a result, the information terminal 400 that receives the detection result of the detection unit 33 can notify (notify) the detection result to the user. As an example, when the detection unit 33 detects an abnormality in the wiring C11, the notification unit 714 transmits a signal including the detection result to the information terminal 400. The user can know the detection result of the detection unit 33 by operating the information terminal 400, for example, by viewing an email or starting an application for the abnormality detection system 100 installed in the information terminal 400. However, the manner of notification by notification unit 714 is not limited to this.

[0098] That is, the notification unit 714 may notify in various ways, for example, by transmitting to the information terminal 400 (see FIG. 1), displaying (including emitting light), outputting sound (including voice), recording (writing) to a non-temporary recording medium, and printing (printing out). For example, the notification unit 714 may visually present the detection result to the user by displaying a character string and / or an image on the presentation unit 73 such as a display device (for example, a liquid crystal display, etc.) provided in the monitoring unit 7, or a display device connected to the monitoring unit 7. In this case, the presentation unit 73 may include a solid-state light-emitting element such as an LED (Light Emitting Diode) provided in the monitoring unit 7. The notification unit 714 may also audibly present the detection result to the user by outputting sound (including voice and alarm sound, etc.) from the presentation unit 73 such as a speaker provided in the monitoring unit 7, or a speaker connected to the monitoring unit 7. In addition, the notification unit 714 may output the detection result of the detection unit 33 by, for example, recording (writing) in the storage unit 74, printing (printing out), or the like.

[0099] In this embodiment, the notification unit 714 executes a process of including detailed information indicating the details of the abnormality in the detection result when an abnormality occurs at least in the wiring C11 and presenting the information. The detailed information may include, for example, type information indicating the type of the abnormality in the wiring C11 and source information regarding the source of the abnormality in the wiring C11. The type information here includes at least two types, a parallel arc and a series arc. The source information here is an estimation result of the estimation unit 715, and includes, for example, information identifying a phase in which the abnormality has occurred among the multiple phases. In other words, the estimation unit 715 estimates which of the multiple phases is the "source of the abnormality," and therefore the source information represents the "source of the abnormality" estimated on a "phase" basis.

[0100] Furthermore, the detailed information may include device information about devices included in the circuit C1 and time information about the time of the abnormality in the wiring C11. The device information here includes information such as the type and number of devices (e.g., electrical devices 23, 24) included in the circuit C1 in which the abnormality occurred. The time information here includes information indicating the timing (time) of the occurrence of the abnormality in the wiring C11 and the duration from the occurrence to the end of the abnormality in the wiring C11.

[0101] Furthermore, the detailed information may include history information regarding the operation history of at least one of the detection unit 33 and the control unit 713. The history information here includes information on the time when the detection unit 33 operated (detected an abnormality) and / or the time when the control unit 713 operated (controlled the switch 2).

[0102] The estimation unit 715 estimates the source of the abnormality. That is, when the detection unit 33 detects the occurrence of an abnormality, the estimation unit 715 estimates which of the multiple phases is the source of the abnormality based on the detection result of the detection unit 33. In short, when an abnormality occurs in the wiring C11 of any one of the multiple phases, the estimation unit 715 estimates which of the multiple phases is the source of the abnormality. That is, the estimation unit 715 identifies the phase estimated to be the source of the abnormality from among the multiple phases.

[0103] In the present disclosure, "estimation" means to determine (decide) by force, and is not limited to a decision made by a person after much deliberation, but generally includes any decision made based on a certain fact. Therefore, for example, when input information is input to a computer system, if the computer system performs a calculation based on the input information and outputs some information as output information, the output information is "estimated" by the computer system. In other words, the estimation unit 715 inputs the detection result of the detection unit 33, and identifies the phase that is the source of the anomaly based on this detection result, thereby estimating the source of the anomaly.

[0104] In this embodiment, as described above, the power distribution system 101 is a single-phase three-wire system, and therefore the three poles included in the power distribution system 101 are a first voltage pole (L1 pole), a second voltage pole (L2 pole), and a neutral pole (N pole). The multiple phases included in the power distribution system 101 include a first phase (L1-N phase) consisting of the first voltage pole and the neutral pole, a second phase (L2-N phase) consisting of the second voltage pole and the neutral pole, and a third phase (L1-L2 phase) consisting of the first voltage pole and the second voltage pole. Therefore, the estimation unit 715 estimates the source by distinguishing at least the first phase or the second phase from the third phase. In other words, the estimation unit 715 at least distinguishes between a case where the first phase or the second phase is the source of the abnormality and a case where the third phase is the source of the abnormality.

[0105] In this embodiment, as described above, the determination circuit 333 of the detection unit 33 determines the presence or absence of an abnormality in the wiring C11 for the two phases, the first phase and the second phase, individually. Therefore, the estimation unit 715 not only distinguishes between the first or second phase and the third phase, but also distinguishes between the first phase and the second phase to estimate the source of the abnormality. As a result, in this embodiment, it is possible to distinguish between three phases and estimate the source of the abnormality. In other words, the estimation unit 715 distinguishes between a case where the first phase is the source of the abnormality, a case where the second phase is the source of the abnormality, and a case where the third phase is the source of the abnormality.

[0106] The estimation unit 715 also estimates the source of the anomaly based on the correlation between the anomalies in the first and second phases. That is, the estimation unit 715 estimates that the third phase is the source of the anomaly when there is a predetermined correlation between the anomaly of the wiring C11 that occurred in the first phase and the anomaly of the wiring C11 that occurred in the second phase. Here, the "predetermined correlation" includes the overlap of the timing of the anomaly occurrence in the first phase and the timing of the anomaly occurrence in the second phase. In the present disclosure, the "overlap" of the timing of the anomaly occurrence includes the case where the periods during which the anomaly occurs completely match and the case where only a part of the periods during which the anomaly occurs overlap. In the latter case, for example, when an anomaly occurs in the first phase first and an anomaly occurs in the second phase while the anomaly in the first phase continues, the timing of the anomaly occurrence in the first phase and the timing of the anomaly occurrence in the second phase overlap.

[0107] The communication unit 72 communicates with the controller 25 and the like installed in the facility 500. As described above, the controller 25 controls or monitors the HEMS-compatible devices. That is, by communicating with the monitoring unit 7, the controller 25 can acquire the instantaneous power and the amount of power in each of the multiple loads (electrical devices 23, 24, etc.) connected to the multiple branch breakers 4, and can control or monitor the HEMS-compatible devices.

[0108] The communication unit 72 is also configured to be able to communicate with the detection unit 33 and the current measuring device 8. Furthermore, as already described, the communication unit 72 communicates with the communication unit 201 of each switch 2 (branch breaker 4) by using, for example, a part of the conductive layer of the substrate of the current measuring device 8. That is, the communication unit 72 has a communication function with the current measuring device 8 and the switch 2 (branch breaker 4) in addition to a communication function with the controller 25. The communication unit 72 may have separate communication modules for communication with the controller 25 and for communication with the current measuring device 8 and the switch 2, for example.

[0109] As already mentioned, the presentation unit 73 is a device, such as a display device or speaker, provided in the monitoring unit 7, that presents the detection result to the user visually or audibly.

[0110] The storage unit 74 includes, for example, an electrically rewritable non-volatile memory such as an EEPROM (Electrically Erasable Programmable Read-Only Memory) or a volatile memory such as a RAM (Random Access Memory). The storage unit 74 has at least a function of storing the detection result of the detection unit 33.

[0111] (3) Operation Hereinafter, the operation of the anomaly detection system 100 according to this embodiment will be described with reference to FIGS. 6 to 7C.

[0112] (3.1) Overall Operation FIG. 6 is a flowchart showing an example of the overall operation of the anomaly detection system 100, that is, an example of an anomaly detection method using the anomaly detection system 100.

[0113] First, the anomaly detection system 100 executes a detection process for detecting an anomaly in the wiring C11 in the power distribution system 101 by the detection unit 33, and judges whether or not there is an anomaly in the wiring C11 in the power distribution system 101 (S1). Specifically, for example, when a series arc occurs in the wiring C11 in the power distribution system 101, the detection unit 33 detects the occurrence of an anomaly (series arc) in the wiring C11 based on voltage information related to the voltage applied to each of the multiple phases. The voltage information is acquired by a detection circuit 331 provided in two or more phases (first phase and second phase) of the multiple phases. If there is no anomaly in the process S1 (S1: No), the anomaly detection system 100 repeatedly executes the detection process (S1) for detecting an anomaly in the wiring C11 by the detection unit 33.

[0114] On the other hand, if there is an abnormality in the wiring C11 (S1: Yes), the abnormality detection system 100 determines whether or not there is a predetermined correlation between the first phase (L1-N phase) and the second phase (L2-N phase) based on the detection result of the detection unit 33 by the estimation unit 715 (S2). In this embodiment, as described above, the detection unit 33 determines whether or not there is an abnormality in the wiring C11 for the two phases, the first phase and the second phase, individually by the determination circuit 333. Therefore, the estimation unit 715 determines whether or not there is a correlation between the detection result for the first phase and the detection result for the second phase by the detection unit 33. At this time, if the timing of occurrence of the abnormality in the first phase and the timing of occurrence of the abnormality in the second phase overlap, the estimation unit 715 estimates that there is a predetermined correlation between the first phase and the second phase. If there is a predetermined correlation between the abnormality in the wiring C11 that occurred in the first phase and the abnormality in the wiring C11 that occurred in the second phase (S2: Yes), the estimation unit 715 estimates that the abnormality originated in the third phase (S3).

[0115] In process S2, if there is no predetermined correlation between the abnormality of the wiring C11 that occurred in the first phase and the abnormality of the wiring C11 that occurred in the second phase (S2: No), the abnormality detection system 100 determines the presence or absence of an abnormality in the first phase (L1-N phase) by the estimation unit 715 (S5). At this time, the estimation unit 715 makes a determination based on the detection result for the first phase by the detection unit 33, and if there is an abnormality in the first phase (S5: Yes), it estimates that the first phase is the source of the abnormality (S6). On the other hand, if there is no abnormality in the first phase (S5: No), the estimation unit 715 estimates that the second phase is the source of the abnormality (S8).

[0116] Through the processes S2, S3, S5, S6, and S8 described above, the estimation unit 715 distinguishes between the first phase, the second phase, and the third phase and estimates the source of the abnormality.

[0117] Furthermore, in this embodiment, when the detection unit 33 detects the occurrence of an abnormality, the control unit 713 cuts off the power supply based on the estimation result of the estimation unit 715. As an example, when any of the multiple phases is estimated to be the source of the abnormality, the anomaly detection system 100 cuts off the circuit C1 only for the phase estimated to be the source of the abnormality. In other words, the anomaly detection system 100 cuts off only the circuit C1 included in the phase estimated to be the source of the abnormality, and does not cut off the circuits C1 included in phases other than the phase estimated to be the source of the abnormality.

[0118] Specifically, when it is estimated that the third phase is the source (S3), the control unit 713 executes a process of cutting off the circuit C1 included in the third phase (L1-L2 phase) as a "cutoff target" (S4). At this time, the control unit 713 outputs a control signal to the switch 2 (branch breaker 4) included in the circuit C1 that is the "cutoff target", thereby opening the contact (cutoff unit 203) built in the switch 2, and cutting off the power supply to the circuit C1. As a result, all the circuits C1 included in the third phase are cut off as "cutoff targets". Similarly, when it is estimated that the first phase is the source (S6), the control unit 713 executes a process of cutting off the circuit C1 included in the first phase (L1-N phase) as a "cutoff target" (S7). When it is estimated that the second phase is the source (S8), the control unit 713 executes a process of cutting off the circuit C1 included in the second phase (L2-N phase) as a "cutoff target" (S9).

[0119] Thereafter, the anomaly detection system 100 notifies the user through the notification unit 714 (S10). That is, the notification unit 714 notifies the user when the detection unit 33 detects the occurrence of an anomaly. At this time, as an example, the notification unit 714 transmits the detection result of the detection unit 33 to the information terminal 400, thereby presenting the detection result to the user from the information terminal 400. Moreover, the notification unit 714 notifies the user of detailed information indicating the details of the anomaly by including it in the detection result. The detailed information includes information identifying the phase in which the anomaly occurred among the multiple phases estimated by the estimation unit 715 as source information. That is, the notification unit 714 notifies the user based on the estimation result of the estimation unit 715.

[0120] The anomaly detection system 100 repeatedly executes the series of steps S1 to S10 described above. The flowchart in Fig. 6 is merely one example of the operation of the anomaly detection system 100, and steps may be omitted or added as appropriate, and the order of steps may be changed as appropriate.

[0121] (3.2) Specific operation example Next, a specific operation example of the anomaly detection system 100 according to this embodiment will be described with reference to Fig. 7A to Fig. 7C. In Fig. 7A to Fig. 7C, the branch breakers 4 in the OFF (disconnected) state are shaded (dotted) to distinguish them from the branch breakers 4 in the ON (energized) state.

[0122] Here, the abnormality detection system 100 detects the presence or absence of an abnormality in the wiring C11 for a plurality of circuits C101-C108 (each corresponding to the circuit C1), and an example is taken of a case where an abnormality occurs in the wiring C11 of any of the circuits C1. Furthermore, among the plurality of circuits C101-C108, the circuits C101-C103 are all 100V circuits included in the first phase (L1-N phase), and are electrically connected to the conductive bar CB21 of the first voltage pole and the conductive bar CB20 of the neutral pole. Among the plurality of circuits C101-C108, the circuits C105-C107 are all 100V circuits included in the second phase (L2-N phase), and are electrically connected to the conductive bar CB22 of the second voltage pole and the conductive bar CB20 of the neutral pole. Of the multiple circuits C101 to C108, circuits C104 and C108 are both 200V circuits included in the third phase (L1-L2 phase) and are electrically connected to a conductive bar CB21 of the first voltage pole and a conductive bar CB22 of the second voltage pole.

[0123] FIG. 7A illustrates a case where an abnormality occurs in the wiring C11 of the circuit C107 included in the second phase (L2-N phase). In the example of FIG. 7A, the detection unit 33 determines whether or not there is an abnormality in the wiring C11 for two phases, the first phase and the second phase, individually in the determination circuit 333, and determines that there is no abnormality in the wiring C11 for the first phase and that there is an abnormality in the wiring C11 for the second phase. Therefore, the estimation unit 715 determines that there is no predetermined correlation between the first phase and the second phase and that there is no abnormality in the first phase, so that it estimates that the second phase is the source of the abnormality. As a result, the control unit 713 cuts off the circuits C105 to C107 included in the second phase as "targets to be cut off". Therefore, as shown in FIG. 7A, only the circuits C105 to C107 of the second phase estimated to be the source of the abnormality are cut off, and a state in which the other circuits C101 to C104 and C108 are energized is established.

[0124] FIG. 7B illustrates a case where an abnormality occurs in the wiring C11 of the circuit C101 included in the first phase (L1-N phase). In the example of FIG. 7B, the detection unit 33 determines whether or not there is an abnormality in the wiring C11 for two phases, the first phase and the second phase, individually in the determination circuit 333, and determines that there is an abnormality in the wiring C11 for the first phase and that there is no abnormality in the wiring C11 for the second phase. Therefore, the estimation unit 715 determines that there is no predetermined correlation between the first phase and the second phase and that there is an abnormality in the first phase, so that it is estimated that the first phase is the source of the abnormality. As a result, the control unit 713 cuts off the circuits C105 to C107 included in the second phase as "targets to be cut off". Therefore, as shown in FIG. 7B, only the circuits C101 to C103 of the first phase, which are estimated to be the source of the abnormality, are cut off, and a state in which the other circuits C104 to C108 are energized is established.

[0125] FIG. 7C illustrates a case where an abnormality occurs in the wiring C11 of the circuit C108 included in the third phase (L1-L2 phase). In the example of FIG. 7C, the detection unit 33 determines whether or not there is an abnormality in the wiring C11 for two phases, the first phase and the second phase, individually in the determination circuit 333, and determines that there is an abnormality in the wiring C11 for the first phase and that there is an abnormality in the wiring C11 for the second phase. Therefore, the estimation unit 715 determines that there is a predetermined correlation between the first phase and the second phase, and therefore estimates that the third phase is the source of the abnormality. As a result, the control unit 713 cuts off the circuits C104 and C108 included in the third phase as "targets to be cut off". Therefore, as shown in FIG. 7C, only the circuits C104 and C108 of the third phase estimated to be the source of the abnormality are cut off, and a state in which the other circuits C101 to C103, C105 to C107 are energized is established.

[0126] (4) Variations The first embodiment is merely one of various embodiments of the present disclosure. Various modifications of the first embodiment are possible depending on the design and the like, as long as the object of the present disclosure can be achieved. Each figure described in the present disclosure is a schematic diagram, and the ratio of the size and thickness of each component in each figure does not necessarily reflect the actual dimensional ratio. In addition, the same function as the anomaly detection system 100 according to the first embodiment may be embodied in an anomaly detection method, a (computer) program, or a non-transitory recording medium on which a program is recorded, or the like.

[0127] The anomaly detection method according to one embodiment includes a detection process (corresponding to "S1" in FIG. 6) and an estimation process (corresponding to "S2", "S3", "S5", "S6", and "S8" in FIG. 6). The detection process is a process for detecting an anomaly in wiring in the power distribution system 101. The power distribution system 101 supplies power to a load through any one of a plurality of phases, each of which includes three poles and is composed of a pair of poles among the three poles. The estimation process is a process for estimating, when an anomaly is detected, which of the plurality of phases is the source of the anomaly, based on the detection result. The program according to one embodiment is a program for causing one or more processors to execute the above anomaly detection method.

[0128] Below, we will list some modified examples of the embodiment 1. The modified examples explained below can be applied in appropriate combinations.

[0129] The anomaly detection system 100 in the present disclosure includes a computer system in, for example, the information processing unit 71. 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 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.

[0130] Furthermore, it is not essential for the anomaly detection system 100 that at least a portion of the functions of the anomaly detection system 100 are concentrated in one housing, and the components of the anomaly detection system 100 may be distributed across multiple housings. For example, the estimation unit 715 may be provided in a housing separate from the control unit 713. Furthermore, the functions of the control unit 713 or the estimation unit 715, etc. may be provided in a device separate from the monitoring unit 7, such as a server. Furthermore, at least a portion of the functions of the anomaly detection system 100, for example, the function of the estimation unit 715, may be realized by cloud (cloud computing) or the like.

[0131] Conversely, at least some of the functions distributed among multiple devices in the first embodiment may be integrated into one housing. For example, the detection unit 33 may be integrated with the monitoring unit 7, in which case the functions of the monitoring unit 7 and the detection unit 33 are integrated into one housing. Also, the detection unit 33 may be integrated with the main breaker 3, for example, in which case the functions of the main breaker 3 and the detection unit 33 are integrated into one housing.

[0132] Furthermore, the anomaly detection system 100 may have a function of changing a target item related to the detection unit 33. The "target item" in the present disclosure is an item such as various parameters, algorithms, operation timing, or content related to the detection unit 33. For example, the target item includes a sensitivity (including a threshold value for the determination) related to the determination of whether or not an abnormality has occurred in the wiring C11 in the detection unit 33, or a determination algorithm. Therefore, by changing such target items, the anomaly detection system 100 can change, for example, in what case the wiring C11 is determined to be abnormal. In other words, by changing the target item, for example, it is possible to adjust the determination criteria for determining that the wiring C11 is abnormal when a characteristic appears in the voltage information.

[0133] Furthermore, the voltage information used by the detection unit 33 to detect an abnormality in the wiring C11 may be information about the voltage applied to each of the multiple phases, and is not limited to information about the voltage at the secondary terminal T2 (between the conductive bars CB21, CB22, CB20) of the main breaker 3. For example, the detection unit 33 may detect an abnormality in the wiring C11 using information about the voltage at the primary terminal T1 of the main breaker 3 or the voltage at the primary terminal of any one of the branch breakers 4 as voltage information.

[0134] In the first embodiment, the detection unit 33 determines that an arc has occurred in the wiring C11 when the voltage applied to the circuit C1 exceeds a threshold value, but this is not limited to the example. For example, the detection unit 33 may determine that an arc has occurred in the wiring C11 when the number of times that the voltage applied to both ends of the resistor included in the detection circuit 331 (CR circuit) exceeds a threshold value (i.e., the number of times high-frequency noise occurs per certain time) exceeds a set value.

[0135] Furthermore, the circuit C1 including the wiring C11 that is the target of abnormality detection by the detection unit 33 is not limited to a branch circuit including the branch breaker 4. For example, the circuit C1 including the interconnection breaker 6 and the distributed power source 21 may include the wiring C11 that is the target of abnormality detection by the detection unit 33. In this circuit C1, the wiring C11 between the interconnection breaker 6 and the distributed power source 21 is the target of abnormality detection by the detection unit 33, and the interconnection breaker 6 becomes the switch 2 having the function of cutting off the circuit C1. Furthermore, the circuit C1 including the seismic breaker 5 may include the wiring C11 that is the target of abnormality detection by the detection unit 33, and in this case, the seismic breaker 5 becomes the switch 2 having the function of cutting off the circuit C1. Furthermore, the circuit C1 including the main breaker 3 may include the wiring C11 that is the target of abnormality detection by the detection unit 33.

[0136] Furthermore, when the detection unit 33 detects the occurrence of an abnormality, the control unit 713 cuts off the circuit C1 only for the phase estimated to be the source of the abnormality, but this is not limited to the example. For example, when the detection unit 33 detects the occurrence of an abnormality, the control unit 713 may cut off all the circuits C1, or may not cut off only any of the circuits C1.

[0137] Furthermore, the notification unit 714 may transmit the detection result of the detection unit 33 to the external system 600. Specifically, the notification unit 714 may transmit the detection result to the controller 25 (external system 600) via the communication unit 72. Furthermore, the notification unit 714 may transmit the detection result to the cloud via the network 200. In this embodiment, the external system 600 can use, for example, the detection result collected as big data to study the tendency of abnormalities occurring in the wiring C11 or measures against the abnormalities.

[0138] Furthermore, when an abnormality occurs, the notification unit 714 may notify recovery information including a procedure for recovering from the abnormality in the wiring C11. As an example, when an arc occurs in any of the wirings C11, the notification unit 714 may present, as recovery information, contact information for an electrical contractor and a message urging the electrical contractor to contact the electrical contractor. The "contact information" here may include, for example, a telephone number, an email address, or a uniform resource locator (URL) of the electrical contractor's website if the electrical contractor has a website.

[0139] Furthermore, the estimation unit 715 may estimate the source of the wiring C11 by using, for example, a classifier that has been trained by machine learning. The classifier may be capable of performing re-learning while the anomaly detection system 100 is in use.

[0140] 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 estimation unit 715 is realized by implementing the trained neural network in an integrated circuit such as an Application Specific Integrated Circuit (ASIC) or a Field-Programmable Gate Array (FPGA).

[0141] Furthermore, the current measuring device 8 is not limited to a mode having a Rogowski coil, and may be a mode having 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.

[0142] Further, in the first embodiment, the backup power supply 9 is provided outside the monitoring unit 7, but the configuration is not limited to this, and the backup power supply 9 may be built into the monitoring unit 7.

[0143] Also, the power distribution system 101 only needs to include three poles such as a first voltage pole, a second voltage pole, and a neutral pole, and is not limited to a single-phase three-wire system, but may be, for example, a three-phase four-wire system including four poles. Furthermore, the power distribution system 101 may be, for example, a three-phase three-wire system.

[0144] In the first embodiment, the detection unit 33 has the detection circuits 331 provided in two phases, the first phase and the second phase, i.e., two detection circuits 331, but is not limited to this example. For example, the detection unit 33 may have the detection circuits 331 provided in three phases, the first phase, the second phase, and the third phase, i.e., three detection circuits 331. Conversely, the detection circuit 331 may be only one provided in any one of the multiple phases.

[0145] Furthermore, the estimation unit 715 only needs to distinguish between a case where the first phase or the second phase is the source of the anomaly and a case where the third phase is the source of the anomaly, and is not required to distinguish between the first phase and the second phase to estimate the source of the anomaly. In other words, the estimation unit 715 does not need to distinguish between a case where the first phase is the source of the anomaly and a case where the second phase is the source of the anomaly.

[0146] (Embodiment 2) 8, an anomaly detection system 100A according to this embodiment differs from the anomaly detection system 100 according to embodiment 1 in the configuration of a detection unit 33. Hereinafter, common reference symbols will be used for configurations similar to those of embodiment 1, and descriptions thereof will be omitted as appropriate.

[0147] In this embodiment, the detection unit 33 detects an abnormality in the wiring C11 based on a current instead of the voltage information. Specifically, the detection unit 33 has a current detection unit 336 consisting of, for example, a current transformer instead of the detection circuit 331 described in the first embodiment. The measurement circuit 332 measures the current from the output of the current detection unit 336. In this embodiment, a pair of current detection units 336 are attached to the conductive bar CB21 of the first voltage pole (L1 pole) and the conductive bar CB22 of the second voltage pole (L2 pole). This allows the detection unit 33 to measure each of the current flowing through the first voltage pole and the current flowing through the second voltage pole with the pair of current detection units 336. Then, the detection unit 33 can determine the presence or absence of an abnormality (arc fault) in the wiring C11 based on the current for each of the first and second phases individually with the determination circuit 333. That is, the current detection unit 336 corresponds to a detection circuit provided in two or more phases (here, the first phase and the second phase) of the multiple phases.

[0148] Furthermore, in this embodiment, when an abnormality occurs in the wiring C11 at both the first voltage pole (L1 pole) and the second voltage pole (L2 pole), the estimation unit 715 estimates that the source of the abnormality is the third phase (L1-L2 phase). As described above, the detection unit 33 measures each of the current flowing through the first voltage pole and the current flowing through the second voltage pole. Therefore, when it is determined that an abnormality occurs in the wiring C11 at both the current flowing through the first voltage pole and the current flowing through the second voltage pole, the estimation unit 715 estimates that the source of the abnormality is the third phase.

[0149] In addition, in embodiment 2, the detection unit 33 detects an abnormality in the wiring C11 based only on the current, but this configuration is not limited to this, and the detection unit 33 may detect an abnormality in the wiring C11 based on voltage information in addition to the current.

[0150] The monitoring unit 7 also acquires the current value measured by the current measuring device 8. Therefore, the detection section 33 is provided in the monitoring unit 7, and is also capable of detecting an abnormality in the wiring C11 included in each of the multiple circuits C1 based on the current flowing through each of the multiple circuits C1. In other words, the monitoring unit 7 can also use the current value used in the measurement function (the function of measuring at least one of the current and power of the multiple branch circuits) for the detection section 33 to detect an abnormality in the wiring C11.

[0151] Furthermore, the detection unit 33 may detect an abnormality in the wiring C11 based on the current on the primary terminal T1 side of the main breaker 3, instead of the current on the secondary terminal T2 side of the main breaker 3. In this case, the current detection unit 336 is attached to the service wire CB1 of the first voltage pole and the service wire CB1 of the second voltage pole, instead of the conductive bar CB21 of the first voltage pole and the conductive bar CB22 of the second voltage pole.

[0152] Further, the current detection unit 336 is not limited to a current transformer, and may have a sensor such as a Hall element, a magnetic resistance element such as a GMR (Giant Magnetic Resistance) element, or a shunt resistor.

[0153] The various configurations (including modified examples) described in the second embodiment can be adopted in appropriate combination with the various configurations (including modified examples) described in the first embodiment.

[0154] (summary) As described above, the anomaly detection system (100, 100A) according to the first aspect includes the detection unit (33) and the estimation unit (715). The detection unit (33) detects an anomaly in the wiring (C11) in the power distribution system (101). The power distribution system (101) supplies power to a load through any one of a plurality of phases including three poles and each of which is a pair of poles among the three poles. When the detection unit (33) detects the occurrence of an anomaly, the estimation unit (715) estimates, based on a detection result of the detection unit (33), which of the plurality of phases is a source of the anomaly.

[0155] According to this aspect, when an abnormality occurs in the wiring (C11), not only is the occurrence of the abnormality detected, but also it is possible to estimate in which of the multiple phases included in the power distribution system (101) the abnormality occurs. Therefore, even when a similar abnormality occurs in the wiring (C11), it is possible to take different measures depending on, for example, when the source of the abnormality is the L1-N phase, the L2-N phase, or the L1-L2 phase. In this way, the abnormality detection system (100, 100A) has the advantage of being able to detect a wider variety of abnormalities.

[0156] In the anomaly detection system (100, 100A) according to the second embodiment, the detection unit (33) in the first embodiment has detection circuits (331) provided in two or more phases of the multiple phases.

[0157] According to this embodiment, the detection circuits (331) provided in two or more phases can easily detect abnormalities in the wiring (C11) in two or more phases.

[0158] In the anomaly detection system (100, 100A) according to the third aspect, in the first or second aspect, the three poles are a first voltage pole (L1 pole), a second voltage pole (L2 pole), and a neutral pole (N pole). The multiple phases include a first phase (L1-N phase) consisting of the first voltage pole (L1 pole) and the neutral pole (N pole), a second phase (L2-N phase) consisting of the second voltage pole (L2 pole) and the neutral pole (N pole), and a third phase (L1-L2 phase) consisting of the first voltage pole (L1 pole) and the second voltage pole (L2 pole). The estimation unit (715) estimates the source by distinguishing at least the first phase (L1-N phase) or the second phase (L2-N phase) from the third phase (L1-L2 phase).

[0159] According to this aspect, in a single-phase three-wire power distribution system (101), it is possible to distinguish at least the first phase (L1-N phase) or the second phase (L2-N phase) from the third phase (L1-L2 phase) as the source of an abnormality.

[0160] In the anomaly detection system (100, 100A) according to the fourth aspect, in the third aspect, the estimation unit (715) estimates that the third phase (L1-L2 phase) is the source of the anomaly in the following cases: That is, the estimation unit (715) estimates that the third phase (L1-L2 phase) is the source of the anomaly in the wiring (C11) when there is a predetermined correlation between an anomaly in the wiring (C11) that occurs in the first phase (L1-N phase) and an anomaly in the wiring (C11) that occurs in the second phase (L2-N phase).

[0161] According to this embodiment, it is possible to estimate that the third phase (L1-L2 phase) is the source of the abnormality without determining whether or not there is an abnormality in the wiring (C11) for the third phase (L1-L2 phase).

[0162] In the anomaly detection system (100, 100A) according to the fifth aspect, in the fourth aspect, the predetermined correlation includes an overlap between the timing of an anomaly occurring in the first phase (L1-N phase) and the timing of an anomaly occurring in the second phase (L2-N phase).

[0163] According to this embodiment, it is possible to estimate that the third phase (L1-L2 phase) is the source of the abnormality without determining whether or not there is an abnormality in the wiring (C11) for the third phase (L1-L2 phase).

[0164] In the anomaly detection system (100, 100A) according to the sixth aspect, in the third aspect, the estimation unit (715) estimates that the third phase (L1-L2 phase) is the source of an abnormality when an abnormality occurs in the wiring (C11) in both the first voltage pole (L1) and the second voltage pole (L2).

[0165] According to this embodiment, it is possible to estimate that the third phase (L1-L2 phase) is the source of the abnormality without determining whether or not there is an abnormality in the wiring (C11) for the third phase (L1-L2 phase).

[0166] The anomaly detection system (100, 100A) according to a seventh aspect is in any one of the first to sixth aspects, and further includes a notification unit (714) that issues a notification when the occurrence of an anomaly is detected by the detection unit (33). The notification unit (714) issues a notification based on a result of estimation by the estimation unit (715).

[0167] According to this embodiment, the estimation result of the estimation unit (715) can be notified to the user.

[0168] The anomaly detection system (100, 100A) according to an eighth aspect is the anomaly detection system according to any one of the first to seventh aspects, further including a control unit (713) that cuts off the power supply when the occurrence of an anomaly is detected by the detection unit (33). The control unit (713) cuts off the power supply based on the estimation result of the estimation unit (715).

[0169] According to this embodiment, automatic shutoff according to the estimation result of the estimation unit (715) is possible.

[0170] In the anomaly detection system (100, 100A) according to a ninth aspect, in any one of the first to eighth aspects, the detection unit (33) detects an anomaly in the wiring (C11) based on voltage information related to the voltage applied to each of a plurality of phases.

[0171] According to this embodiment, even when it is difficult to detect an abnormality from the current, it is possible to detect an abnormality in the wiring (C11).

[0172] A distribution board system (1) according to a tenth aspect includes an abnormality detection system (100, 100A) according to any one of the first to ninth aspects, and a plurality of branch breakers (4). The plurality of branch breakers (4) branch at least one phase of a plurality of phases into a plurality of circuits (C1).

[0173] This embodiment has the advantage that a wider variety of abnormalities can be detected.

[0174] An anomaly detection method according to an eleventh aspect includes a detection process and an estimation process. The detection process is a process for detecting an anomaly in a wiring (C11) in a power distribution system (101). The power distribution system (101) supplies power to a load through any one of a plurality of phases including three poles and each of which is a pair of poles among the three poles. The estimation process is a process for estimating, when an occurrence of an anomaly is detected, which of the plurality of phases is a source of the anomaly based on a detection result.

[0175] This embodiment has the advantage that a wider variety of abnormalities can be detected.

[0176] A program according to a twelfth aspect is a program for causing one or more processors to execute the anomaly detection method according to the eleventh aspect.

[0177] This embodiment has the advantage that a wider variety of abnormalities can be detected.

[0178] Not limited to the above-mentioned aspects, various configurations (including modified examples) of the anomaly detection system (100, 100A) according to the first and second embodiments can be embodied in the anomaly detection method or program.

[0179] The configurations according to the second to ninth aspects are not essential components of the anomaly detection system (100, 100A) and can be omitted as appropriate. [Explanation of symbols]

[0180] 1 Distribution Board System 4-branch breaker 33 Detection unit 100,100A Anomaly Detection System 101 Power Distribution System 331 Detection circuit 713 Control Unit 714 Information Department 715 Estimation Department C1 circuit C11 Wiring

Claims

1. A detection unit that detects an abnormality in wiring in a power distribution system that supplies power to a load through any one of a plurality of phases including three poles and a pair of the three poles; an estimation unit that estimates, when the detection unit detects the occurrence of the abnormality, which of the plurality of phases is connected to a circuit that is a source of the abnormality, based on a detection result of the detection unit; The three poles are a first voltage pole, a second voltage pole, and a neutral pole, the plurality of phases include a first phase consisting of the first voltage pole and the neutral pole, a second phase consisting of the second voltage pole and the neutral pole, and a third phase consisting of the first voltage pole and the second voltage pole; The estimation unit is estimating the source by distinguishing at least the first phase or the second phase from the third phase; When there is a predetermined correlation between the wiring abnormality occurring in the first phase and the wiring abnormality occurring in the second phase, it is estimated that the abnormality originates from a circuit connected to the third phase; The predetermined correlation includes an overlap between an occurrence timing of the abnormality in the first phase and an occurrence timing of the abnormality in the second phase. Anomaly detection system.

2. Further comprising an alarm unit that issues an alarm when the occurrence of the abnormality is detected by the detection unit, The notification unit is A notification is made based on the estimation result of the estimation unit. presenting type information indicating a type of the abnormality and source information regarding a source of the abnormality; The type information includes at least two types of a parallel arc and a series arc. The anomaly detection system according to claim 1 .

3. The detection unit has detection circuits provided in two or more phases among the plurality of phases. The anomaly detection system according to claim 1 or 2.

4. Further comprising a control unit that cuts off the power supply when the occurrence of the abnormality is detected by the detection unit, The control unit performs blocking based on the estimation result of the estimation unit. The anomaly detection system according to any one of claims 1 to 3.

5. The detection unit detects an abnormality in the wiring based on voltage information regarding a voltage applied to each of the plurality of phases. The anomaly detection system according to any one of claims 1 to 4.

6. An anomaly detection system according to any one of claims 1 to 5, and a plurality of branch breakers for branching at least one of the plurality of phases into a plurality of circuits. Distribution board system.

7. A detection process for detecting an abnormality in wiring in a power distribution system that supplies power to a load in any one of a plurality of phases including three poles and a pair of the three poles; and an estimation process for estimating, when the occurrence of the abnormality is detected, which of the phases is connected to a circuit that is a source of the abnormality, based on a detection result; The three poles are a first voltage pole, a second voltage pole, and a neutral pole, the plurality of phases include a first phase consisting of the first voltage pole and the neutral pole, a second phase consisting of the second voltage pole and the neutral pole, and a third phase consisting of the first voltage pole and the second voltage pole; In the estimation process, estimating the source by distinguishing at least the first phase or the second phase from the third phase; When there is a predetermined correlation between the wiring abnormality occurring in the first phase and the wiring abnormality occurring in the second phase, it is estimated that the abnormality originates from a circuit connected to the third phase; The predetermined correlation includes an overlap between an occurrence timing of the abnormality in the first phase and an occurrence timing of the abnormality in the second phase. Anomaly detection methods.

8. Further comprising a notification process for notifying when the occurrence of the abnormality is detected, In the notification process, A notification is made based on the estimation result in the estimation process. presenting type information indicating a type of the abnormality and source information regarding a source of the abnormality; The type information includes at least two types of a parallel arc and a series arc. The anomaly detection method according to claim 7.

9. A program for causing one or more processors to execute the anomaly detection method described in claim 7 or 8.

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