Arc detection device, distribution board system and distribution system

Abstract

To provide an arc detection device facilitating specification of arc occurrence locations.SOLUTION: An arc detection device 1 includes a voltage waveform acquisition unit 11, a current waveform acquisition unit 12, and a determination unit 13. The voltage waveform acquisition unit 11 acquires a voltage waveform of a voltage applied to a target circuit 52 between a system power supply 3 and a load device 4. The current waveform acquisition unit 12 acquires a current waveform of a current flowing through the target circuit 52. The determination unit 13 determines an occurrence of an arc on the basis of the voltage waveform and the current waveform. The determination unit 13 determines whether the arc occurrence location is on the system power supply 3 side or on the load device 4 side of the target circuit 52 on the basis of whether the voltage waveform is a sine wave.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to an arc detection device, a distribution board system, and a power distribution system, and more particularly to an arc detection device, a distribution board system, and a power distribution system that detect the occurrence and location of an arc in a circuit between a system power source and a load device. [Background technology]

[0002] In the power distribution path between the system power supply and the load equipment, if there is a loose screw in a terminal, a broken wire in the indoor wiring, etc., an arc discharge may occur. For this reason, for example, in the technology disclosed in Patent Document 1, the arc discharge is detected based on the detection signals of the voltage and the current. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2019-144180 Summary of the Invention [Problem to be solved by the invention]

[0004] However, with the technology disclosed in Patent Document 1, depending on the scale of the power distribution route, it may be difficult to identify the location where the arc is occurring. In other words, with the technology disclosed in Patent Document 1, it may be difficult to identify the cause of the arc.

[0005] The present disclosure aims to provide an arc detection device, a distribution board system, and a power distribution system that make it easy to identify the location of an arc occurrence. [Means for solving the problem]

[0006] An arc detection device according to one aspect of the present disclosure includes a voltage waveform acquisition unit, a current waveform acquisition unit, and a determination unit. The voltage waveform acquisition unit acquires a voltage waveform of a voltage applied to a target circuit between a system power supply and a load device. The current waveform acquisition unit acquires a current waveform of a current flowing through the target circuit. The determination unit determines the occurrence of an arc based on the voltage waveform and the current waveform. The determination unit determines whether the arc has occurred on the system power supply side or the load device side of the target circuit based on whether the voltage waveform is a sine wave.

[0007] A distribution board system according to an aspect of the present disclosure includes the arc detection device and a main breaker, wherein the target circuit is located closer to the load device than an input terminal of the main breaker.

[0008] A power distribution system according to one aspect of the present disclosure includes the arc detection device and a power outlet, wherein the target circuit is disposed closer to the power grid than the outlet's outlet.

[0009] According to another aspect of the present disclosure, there is provided a power distribution system including the arc detection device and a power outlet, wherein the target circuit is disposed between the power outlet and the load device. [Effects of the Invention]

[0010] According to an aspect of the present disclosure, an arc detection device, a distribution board system, and a power distribution system make it easy to identify the location of an arc. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram showing the configuration of an arc detection device according to the first embodiment. [Figure 2] FIG. 2 is a schematic configuration diagram of the distribution board system according to the first embodiment. [Figure 3] FIG. 3 is an external view of the distribution board system. [Figure 4] FIG. 4 is a graph showing a current waveform when an arc is generated. [Figure 5] FIG. 5 is a graph showing a voltage waveform when an arc occurs on the load device side of the target circuit. [Figure 6] FIG. 6 is a graph showing a voltage waveform when an arc occurs on the system power supply side of the target circuit. [Figure 7] FIG. 7 is a flowchart showing the operation of the arc detection device according to the first embodiment. [Figure 8] FIG. 8 is a schematic configuration diagram of a power distribution system according to the fourth embodiment. [Figure 9] FIG. 9 is a schematic configuration diagram of a power distribution system according to the fifth embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0012] Arc detection devices, distribution board systems, and power distribution systems according to embodiments will be described in detail below with reference to the drawings. However, the figures described in the following embodiments are schematic diagrams, and the ratios of the sizes and thicknesses of the components do not necessarily reflect the actual dimensional ratios. Note that the configurations described in the following embodiments are merely examples of the present disclosure. The present disclosure is not limited to the following embodiments, and various modifications are possible depending on the design, etc., as long as the effects of the present disclosure can be achieved.

[0013] (Embodiment 1) (1) Overview The arc detection device 1 (see FIG. 1) is a system that detects the occurrence of an arc in a power distribution path 5 between, for example, a power system 3 and a load device 4. The power system 3 is, for example, an AC power source such as a commercial power source, a solar power generation system, or a grid-connected system. The load device 4 is, for example, a device that operates on AC power, such as a home appliance, an air conditioning system, or a lighting fixture.

[0014] Here, the power distribution path 5 is an electrical facility that receives power from the power system 3 and distributes the power to the load devices 4, and is fixed to a building, for example. As shown in Fig. 2, the power distribution path 5 includes, for example, a main electric circuit 24 for receiving power from the power system 3, a distribution board 2, a plurality of (three in Fig. 2) branch electric circuits 25, and a plurality of (three in Fig. 2) outlets 6.

[0015] The arc detection device 1 determines whether an arc has occurred and whether the arc has occurred on the system power supply 3 side or the load device 4 side of the target circuit 52, based on the voltage waveform and current waveform of the target circuit 52 included in the electrical equipment.

[0016] (2) Composition (2.1) Power distribution route As shown in FIG. 2, the power distribution path 5 includes a main electric line 24, a distribution board 2, a plurality of branch electric lines 25, and a plurality of outlets 6.

[0017] The main electric circuit 24 is an electric circuit that supplies power from the system power supply 3 to the distribution board 2. For example, single-phase three-wire AC power is supplied from the system power supply 3 to the distribution board 2. The main electric circuit 24 includes, for example, three electric wires corresponding to the L1 phase, L2 phase, and N phase, respectively.

[0018] As shown in FIGS. 2 and 3, the distribution board 2 includes a cabinet 20, a main breaker 21, a bus bar 22, and a plurality of branch breakers 23 (three in FIG. 2).

[0019] The cabinet 20 is a housing that houses a main breaker 21, a bus bar 22, and a plurality of branch breakers 23.

[0020] The main breaker 21 is connected between the main electric circuit 24 and the bus bar 22. The main breaker 21 establishes or breaks electrical continuity between the main electric circuit 24 and the bus bar 22 by switching between a closed state and an open state. The main breaker 21 has an input terminal 211 connected to the main electric circuit 24 and an output terminal 212 connected to the bus bar 22. The input terminal 211 includes, for example, three terminals corresponding to the L1 phase, the L2 phase, and the N phase. The output terminal 212 includes, for example, three terminals corresponding to the L1 phase, the L2 phase, and the N phase.

[0021] The bus bar 22 is disposed between the main breaker 21 and the branch breakers 23. More specifically, the bus bar 22 is a conductor that supplies power output from the output terminal 212 of the main breaker 21 to the branch breakers 23. The bus bar 22 includes, for example, three strip-shaped conductors that are arranged parallel to each other and insulated from each other. More specifically, the bus bar 22 includes three conductors that are long in the X direction. The three strip-shaped conductors correspond to, for example, the L1 phase, the L2 phase, and the N phase, respectively.

[0022] The branch breakers 23 are connected between the bus bar 22 and the branch electric circuits 25. The branch breakers 23 are adjacent to the bus bar 22 in the Z direction, for example. The branch breakers 23 correspond one-to-one to the branch electric circuits 25. The branch breakers 23 are switched between a closed state and an open state to establish or block conduction between the bus bar 22 and the branch electric circuit 25 corresponding to the branch breaker 23. The branch breaker 23 has an input terminal 231 connected to the bus bar 22 and an output terminal 232 connected to the branch electric circuit 25 corresponding to the branch breaker 23. The input terminal 231 is connected to two of the three conductors of the bus bar 22. The branch breaker 23 is connected, for example, to a conductor of the bus bar 22 corresponding to either the L1 phase or the L2 phase, and a conductor corresponding to the N phase. The branch breaker 23 is also connected, for example, to a conductor of the bus bar 22 corresponding to the L1 phase and a conductor of the bus bar 22 corresponding to the L2 phase. The output terminal 232 includes, for example, two terminals, which correspond to different phases.

[0023] The multiple branch electric circuits 25 are electric circuits that supply power from the distribution board 2 to the multiple outlets 6. Each of the multiple branch electric circuits 25 supplies power to one or more of the multiple outlets 6. Each of the multiple branch electric circuits 25 includes, for example, two electric wires.

[0024] The plurality of outlets 6 can be detachably connected to plugs from electrical devices that are load devices 4. The plurality of outlets 6 are arranged, for example, on the wall of a building.

[0025] (2.2) Arc detection device Arc detection device 1 (see FIGS. 1 and 2) is installed in target circuit 52 between system power supply 3 and load device 4. Arc detection device 1 is disposed in distribution board 2, for example, as shown in FIG. 2. Hereinafter, a system including distribution board 2 and arc detection device 1 will be referred to as distribution board system 8.

[0026] The target circuit 52 is a part of the power distribution path 5, and is, for example, on the load device 4 side of the input terminal 211 of the main breaker 21. More specifically, the target circuit 52 is, for example, between the input terminal 211 and the output terminal 212 of the main breaker 21. Hereinafter, the circuit between the target circuit 52 and the system power supply 3 in the power distribution path 5 will be referred to as an upstream circuit 51. Furthermore, the circuit between the target circuit 52 and the load device 4 in the power distribution path 5 will be referred to as a downstream circuit 53.

[0027] Arc detection device 1 includes voltage waveform acquisition unit 11, current waveform acquisition unit 12, determination unit 13, and notification unit .

[0028] The voltage waveform acquisition unit 11 acquires the voltage waveform of the voltage applied to the target circuit 52. When the target circuit 52 is located between the input terminal 211 and the output terminal 212 of the main breaker 21, the voltage waveform acquisition unit 11 acquires the voltage waveform of the voltage applied to the input terminal 211 of the main breaker 21. The voltage waveform acquisition unit 11 acquires the voltage waveform of the target circuit 52, for example, by acquiring the voltage value of the target circuit 52 at a constant cycle.

[0029] The current waveform acquisition unit 12 acquires the current waveform of the current flowing through the target circuit 52. That is, the current waveform acquisition unit 12 acquires the current waveform of the current passing through the main breaker 21. The current waveform acquisition unit 12 acquires the current value of the target circuit 52 at a constant cycle, for example, to acquire the current waveform of the target circuit 52.

[0030] The determination unit 13 determines whether an arc has occurred based on the voltage waveform acquired by the voltage waveform acquisition unit 11 and the current waveform acquired by the current waveform acquisition unit 12. Furthermore, when an arc has occurred, the determination unit 13 determines whether the arc has occurred on the system power supply 3 side or the load device 4 side of the target circuit 52 based on whether the voltage waveform is a sine wave or not.

[0031] More specifically, the determination unit 13 determines that an arc is occurring if the current waveform is distorted relative to a sine wave. Here, "the current waveform is distorted relative to a sine wave" means that there is a time period during which the current value changes discontinuously. When an arc is occurring, as shown in FIG. 4, a time period T1 occurs during which the absolute value of the current flowing through the power distribution path 5 becomes small, and the current value changes discontinuously at the end of time T1 in the current waveform. For example, the determination unit 13 determines that the current waveform is distorted relative to a sine wave if the absolute value of the time rate of change of the current value is equal to or greater than a threshold value.

[0032] Furthermore, if the voltage waveform is a sine wave when an arc occurs, the determination unit 13 determines that the arc is occurring on the load device 4 side of the target circuit 52. Here, "the voltage waveform is a sine wave" means that a voltage is continuously applied to the target circuit 52 from the system power supply 3. In other words, "the voltage waveform is a sine wave" means that there is no time period during which the voltage value is discontinuous. This is because even if an arc occurs in the downstream circuit 53, if no arc occurs in the upstream circuit 51, there is no time period during which voltage is not applied to the target circuit 52 from the system power supply 3. In other words, if no arc occurs in the upstream circuit 51, as shown in FIG. 5 , the voltage waveform has continuous voltage values ​​before and after time T1. In other words, if a voltage is continuously applied to the target circuit 52 from the system power supply 3, the determination unit 13 determines that the arc is occurring on the load device 4 side of the target circuit 52. Possible locations where an arc may occur in the downstream circuit 53 include, for example, the output terminal 212 of the main breaker 21, the output terminal 232 of the branch breaker 23, the branch circuit 25, the connection point between the branch circuit 25 and the outlet 6, the connection point between the outlet 6 and the load device 4, and inside the load device 4.

[0033] On the other hand, if the voltage waveform is not a sine wave when an arc occurs, the determination unit 13 determines that the arc is occurring on the system power supply 3 side of the target circuit 52. Here, "the voltage waveform is not a sine wave" means that there is a time when the voltage value changes discontinuously. When an arc occurs in the upstream circuit 51, the absolute value of the voltage applied to the target circuit 52 also becomes small at time T1, as shown in FIG. 6. In other words, if the voltage applied to the target circuit 52 is not a sine wave, the determination unit 13 determines that the arc is occurring on the system power supply 3 side of the target circuit 52. Possible locations of the arc in the upstream circuit 51 include, for example, the main circuit 24 or the input terminal 211 of the main breaker 21.

[0034] For example, when the determination unit 13 detects the occurrence of an arc, it shuts off one of the main breaker 21 and the multiple branch breakers 23 that can cut off the power supply to the target circuit 52. More specifically, when the determination unit 13 detects the occurrence of an arc, it transitions the main breaker 21 to an open state.

[0035] When the determination unit 13 detects the occurrence of an arc, the notification unit 14 notifies the user. The notification unit 14 includes, for example, a light-emitting element. When the determination unit 13 detects an arc, the notification unit 14 causes the light-emitting element to emit light. At this time, the notification unit 14 changes the light-emitting mode depending on whether the arc occurs in the upstream circuit 51 or the downstream circuit 53. For example, the notification unit 14 blinks the light-emitting element when the arc occurs in the upstream circuit 51, and continuously lights the light-emitting element when the arc occurs in the downstream circuit 53. The notification unit 14 also includes, for example, a speaker, and notifies the user of the occurrence of an arc by an alarm sound or a message when an arc occurs. At this time, the notification unit 14 changes the content of the alarm sound or message depending on whether the arc occurs in the upstream circuit 51 or the downstream circuit 53.

[0036] The arc detection device 1 is, for example, a computer having a processor. More specifically, the arc detection device 1 is configured by, for example, a computer system having a CPU (Central Processing Unit) and a memory. The computer system realizes the functions of the voltage waveform acquisition unit 11, the current waveform acquisition unit 12, the determination unit 13, and the notification unit 14 of the arc detection device 1 by executing a program stored in the memory by the CPU. The program may be pre-recorded in the memory of the computer system, may be provided by being recorded on a recording medium such as a memory card, or may be provided via a telecommunications line such as the Internet.

[0037] (3) Operation FIG. 7 is a flowchart showing the operation of the arc detection device 1 according to the first embodiment.

[0038] The current waveform acquisition unit 12 of the arc detection device 1 acquires the current waveform of the target circuit 52 (step S1).

[0039] Next, determination unit 13 of arc detection device 1 determines whether an arc has occurred based on the current waveform (step S2). For example, determination unit 13 determines that an arc has occurred if the current waveform is distorted relative to a sine wave.

[0040] When the determining unit 13 determines that no arc is occurring (No in step S2), the arc detecting device 1 returns to step S1 and performs the operation.

[0041] On the other hand, in the arc detection device 1, when the determination unit 13 determines that an arc has occurred (Yes in step S2), the voltage waveform acquisition unit 11 acquires the voltage waveform of the target circuit 52 (step S3).

[0042] Next, the determining unit 13 of the arc detecting device 1 determines whether the voltage waveform is a sine wave or not (step S4).

[0043] If the voltage waveform is not a sine wave (No in step S4), the determination unit 13 determines (step S5) that the arc has occurred on the side of the system power supply 3. As described above, if an arc has occurred in the upstream circuit 51, the waveform of the voltage applied to the target circuit 52 is no longer a sine wave.

[0044] On the other hand, if the voltage waveform is a sine wave (Yes in step S4), the determination unit 13 determines that the arc has occurred on the load device 4 side (step S6). As described above, when an arc has occurred in the downstream circuit 53, the waveform of the voltage applied to the target circuit 52 remains a sine wave.

[0045] After step S5 or S6, the notification unit 14 of the arc detection device 1 notifies the user (step S7). The notification unit 14 notifies the user of the occurrence of an arc by, for example, light, sound, or light and sound.

[0046] (4) Effects The arc detection device 1 according to the first embodiment includes a voltage waveform acquisition unit 11, a current waveform acquisition unit 12, and a determination unit 13. The voltage waveform acquisition unit 11 acquires the voltage waveform of a voltage applied to a target circuit 52 between a system power supply 3 and a load device 4. The current waveform acquisition unit 12 acquires the current waveform of a current flowing through the target circuit 52. The determination unit 13 determines the occurrence of an arc based on the voltage waveform and the current waveform. The determination unit 13 determines whether the location of the arc is on the system power supply 3 side or the load device 4 side of the target circuit 52 based on whether the voltage waveform is a sine wave. As a result, the arc detection device 1 according to the first embodiment makes it easy to identify the location of the arc.

[0047] Furthermore, in the arc detection device 1 according to the first embodiment, when the voltage waveform is a sine wave, the determination unit 13 determines that the location of the arc is on the load device 4 side of the target circuit 52. When the voltage waveform is not a sine wave, the determination unit 13 determines that the location of the arc is on the system power supply 3 side of the target circuit 52. This allows the arc detection device 1 to identify whether the location of the arc is upstream or downstream of the target circuit 52. This makes it easy to identify the location of the arc, and enables early detection of installation defects or failures in the power distribution path 5, such as loose screws or broken wires.

[0048] Moreover, the distribution board system 8 according to the first embodiment includes the arc detection device 1 and the main breaker 21. The target circuit 52 is located closer to the load device 4 than the input terminal 211 of the main breaker 21. This allows the distribution board system 8 to determine whether the power distribution path 5 is improperly installed or has a malfunction.

[0049] Furthermore, in the distribution board system 8 according to the first embodiment, the target circuit 52 is arranged between the input terminal 211 of the main breaker 21 and the output terminal 212 of the main breaker 21. This makes it possible for the distribution board system 8 to distinguish between improper installation or failure of the main breaker 21 and improper installation or failure inside the distribution board 2 or in the branch electric circuit 25.

[0050] (Embodiment 2) (1) Composition In a distribution board system 8 according to the second embodiment, a target circuit 52 is arranged between an input terminal 231 and an output terminal 232 of a branch breaker 23. A voltage waveform acquisition unit 11 of the arc detection device 1 acquires a voltage waveform of a voltage applied to the branch breaker 23, which is the target circuit 52. A current waveform acquisition unit 12 of the arc detection device 1 acquires a current waveform of a current flowing through the branch breaker 23, which is the target circuit 52. The upstream circuit 51 includes a main electric circuit 24, a trunk breaker 21, and a bus bar 22. The downstream circuit 53 includes a branch electric circuit 25 and an outlet 6.

[0051] In the arc detection device 1 according to the second embodiment, for example, the occurrence of an arc at the input terminal 211 or the output terminal 212 of the main breaker 21 is determined as the occurrence of an arc on the system power supply 3 side of the branch breaker 23 which is the target circuit 52. In addition, in the arc detection device 1 according to the second embodiment, for example, the occurrence of an arc at the output terminal 232 of the branch breaker 23 or the outlet 6 is determined as the occurrence of an arc on the load device 4 side of the branch breaker 23 which is the target circuit 52.

[0052] (2) Effects The distribution board system 8 according to the second embodiment includes a branch breaker 23. The target circuit 52 is arranged between an input terminal 231 of the branch breaker 23 and an output terminal 232 of the branch breaker 23. This makes it possible for the distribution board system 8 to distinguish between improper installation or failure within the distribution board 2 and improper installation or failure of the branch electric circuit 25 and the outlet 6.

[0053] (Embodiment 3) (1) Composition In a distribution board system 8 according to the third embodiment, the bus bar 22 of the distribution board 2 is the target circuit 52. A voltage waveform acquisition unit 11 of the arc detection device 1 acquires a voltage waveform of a voltage applied to the bus bar 22, which is the target circuit 52. A current waveform acquisition unit 12 of the arc detection device 1 acquires a current waveform of a current flowing through the bus bar 22, which is the target circuit 52. The upstream circuit 51 includes a main electric circuit 24 and a main breaker 21. The downstream circuit 53 includes a branch breaker 23, a branch electric circuit 25, and an outlet 6.

[0054] In the arc detection device 1 according to the third embodiment, for example, the occurrence of an arc at the input terminal 211 or the output terminal 212 of the main breaker 21 is determined as the occurrence of an arc on the system power supply 3 side of the bus bar 22 which is the target circuit 52. In addition, in the arc detection device 1 according to the third embodiment, for example, the occurrence of an arc at the branch breaker 23 or the outlet 6 is determined as the occurrence of an arc on the load device 4 side of the bus bar 22 which is the target circuit 52.

[0055] (2) Effects The distribution board system 8 according to the third embodiment includes a branch breaker 23 and a bus bar 22. The bus bar 22 is arranged between the main breaker 21 and the branch breaker 23. The target circuit 52 is the bus bar 22. This makes it possible for the distribution board system 8 to distinguish between improper installation or a failure of the main breaker 21 and improper installation or a failure of the branch breaker 23 or the branch circuit 25.

[0056] (Embodiment 4) (1) Composition In the arc detection device 1 according to the fourth embodiment, as shown in Fig. 8 , a target circuit 52 is arranged on the power distribution path 5 closer to the system power supply 3 than the outlet 61 of the outlet 6. More specifically, the target circuit 52 is an internal circuit of the outlet 6. The arc detection device 1 according to the fourth embodiment is, for example, built into the outlet 6. Hereinafter, a system including the outlet 6 and the arc detection device 1 will be referred to as a power distribution system 9.

[0057] The voltage waveform acquisition unit 11 of the arc detection device 1 acquires the voltage waveform of the voltage applied to the internal circuit of the outlet 6, which is the target circuit 52. The current waveform acquisition unit 12 of the arc detection device 1 acquires the current waveform of the current flowing through the internal circuit of the outlet 6, which is the target circuit 52. The upstream circuit 51 includes the main electric circuit 24, the distribution board 2, and the branch electric circuit 25. The downstream circuit 53 includes the load device 4.

[0058] In the arc detection device 1 according to the fourth embodiment, for example, the occurrence of an arc in the distribution board 2, the branch electric circuit 25, or the connection point between the branch electric circuit 25 and the outlet 6 is determined as the occurrence of an arc on the system power supply 3 side of the outlet 6, which is the target circuit 52. In addition, in the arc detection device 1 according to the fourth embodiment, for example, the occurrence of an arc in the outlet 61 of the outlet 6 or in the load device 4 is determined as the occurrence of an arc on the load device 4 side of the outlet 6, which is the target circuit 52.

[0059] (2) Effects A power distribution system 9 according to the fourth embodiment includes an arc detection device 1 and an outlet 6. A target circuit 52 is arranged on the system power supply 3 side of the outlet 61. This makes it possible for the power distribution system 9 to distinguish between improper installation or a malfunction on the distribution board 2 side of the outlet 61 and a malfunction on the load device 4 side of the outlet 61.

[0060] (Embodiment 5) (1) Composition A power distribution system 9a according to the fifth embodiment includes a wiring device 7 and an arc detection device 1. The wiring device 7 is connected between an outlet 6 and a load device 4. The wiring device 7 is, for example, an extension cord, a power strip, or an adapter.

[0061] The arc detection device 1 according to the fifth embodiment is built into, for example, a wiring fixture 7. In the arc detection device 1 according to the fifth embodiment, the wiring between the outlet 6 and the load device 4 in the wiring fixture 7 is set as a target circuit 52.

[0062] The voltage waveform acquisition unit 11 of the arc detection device 1 acquires the voltage waveform of the voltage applied to the wiring fixture 7, which is the target circuit 52. The current waveform acquisition unit 12 of the arc detection device 1 acquires the current waveform of the current flowing through the wiring fixture 7, which is the target circuit 52. The upstream circuit 51 includes the main electric circuit 24, the distribution board 2, the branch electric circuit 25, and the outlet 6. The downstream circuit 53 includes the load device 4.

[0063] In the arc detection device 1 according to the fifth embodiment, for example, the occurrence of an arc in the distribution board 2, the branch circuit 25, or the outlet 6 is determined as the occurrence of an arc on the system power supply 3 side of the wiring fixture 7 which is the target circuit 52. In addition, in the arc detection device 1 according to the fourth embodiment, for example, the occurrence of an arc in the load device 4 is determined as the occurrence of an arc on the load device 4 side of the wiring fixture 7 which is the target circuit 52.

[0064] (2) Effects A power distribution system 9a according to the fifth embodiment includes an arc detection device 1 and an outlet 6. A target circuit 52 is disposed between the outlet 6 and a load device 4. This allows the power distribution system 9 to distinguish between poor installation or a malfunction on the distribution board 2 side of the outlet 61 and a malfunction on the load device 4 side of the outlet 61.

[0065] (Other Modifications of the Embodiment) (1) In the arc detection devices 1 according to the first to fifth embodiments, only one target circuit 52 is provided, but the arc detection device 1 may acquire voltage waveforms and current waveforms of multiple target circuits 52. For example, the arc detection device 1 may set the main breaker 21 and each of the multiple branch breakers 23 as the target circuits 52, and detect the occurrence of an arc on the system power supply 3 side of the main breaker 21, the bus bar 22, and the load device 4 side of the multiple branch breakers 23. This makes it easier to identify the location of an arc when it occurs.

[0066] (2) A plurality of arc detectors 1 according to the first to fifth embodiments may be provided on one power distribution line 5. This makes it easier to identify the location of an arc when an arc occurs.

[0067] (3) When the determination unit 13 determines that an arc has occurred, the arc detection device 1 according to the first to fifth embodiments may operate a breaker that can cut off the power supply to the target circuit 52. The arc detection device 1 may perform either one of cutting off the power supply to the target circuit 52 or notifying the user, or may perform both.

[0068] (4) In the arc detection devices 1 according to the first to fifth embodiments, the determination unit 13 detects the occurrence of an arc based on the current waveform, and then determines the location of the arc based on the voltage waveform. However, for example, the determination unit 13 may detect the occurrence of an arc based on both the current waveform and the voltage waveform, and then determine the location of the arc based on the voltage waveform.

[0069] (Aspect) An arc detection device (1) according to a first aspect includes a voltage waveform acquisition unit (11), a current waveform acquisition unit (12), and a determination unit (13). The voltage waveform acquisition unit (11) acquires a voltage waveform of a voltage applied to a target circuit (52) between a system power supply (3) and a load device (4). The current waveform acquisition unit (12) acquires a current waveform of a current flowing through the target circuit (52). The determination unit (13) determines the occurrence of an arc based on the voltage waveform and the current waveform. The determination unit (13) determines whether the location of the arc is on the system power supply (3) side or the load device (4) side of the target circuit (52) based on whether the voltage waveform is a sine wave.

[0070] According to the arc detection device (1) of the above aspect, it is easy to identify the location where the arc occurs.

[0071] In the arc detection device (1) according to the second aspect, the determination unit (13) determines that the location of the arc is on the load device (4) side of the target circuit (52) when the voltage waveform is a sine wave, and determines that the location of the arc is on the system power supply (3) side of the target circuit (52) when the voltage waveform is not a sine wave.

[0072] The arc detection device 1 according to the above aspect can identify whether the arc is occurring upstream or downstream of the target circuit 52. This facilitates identifying the location of the arc, enabling early detection of installation defects such as loose screws and broken wires, as well as faults.

[0073] A distribution board system (8) according to a third aspect includes the arc detection device (1) according to the first or second aspect and a main breaker (21). A target circuit (52) is located closer to a load device (4) than an input terminal (211) of the main breaker (21).

[0074] According to the distribution board system (8) of the above aspect, it is possible to determine improper installation or a malfunction in the distribution board system (8).

[0075] In the distribution board system (8) according to the fourth aspect, in the third aspect, the target circuit (52) is arranged between the input terminal (211) of the main breaker (21) and the output terminal (212) of the main breaker (21).

[0076] According to the distribution board system (8) of the above aspect, it is possible to distinguish between improper installation or failure of the main breaker (21) and improper installation or failure inside the distribution board or in the branch electric circuit.

[0077] The distribution board system (8) according to a fifth aspect is the third aspect, further including a branch breaker (23). The target circuit (52) is arranged between an input terminal (231) of the branch breaker (23) and an output terminal (232) of the branch breaker (23).

[0078] According to the distribution board system (8) of the above aspect, it is possible to distinguish and determine improper installation or failure inside the distribution board from improper installation or failure of the branch electric circuits and the outlets.

[0079] The distribution board system (8) according to a sixth aspect is the third aspect, further including a branch breaker (23) and a bus bar (22). The bus bar (22) is arranged between the main breaker (21) and the branch breaker (23). The target circuit (52) is the bus bar (22).

[0080] According to the distribution board system (8) of the above aspect, it is possible to distinguish between improper installation or failure of the main breaker (21) and improper installation or failure of the branch breaker (23) or the branch electric circuit.

[0081] A power distribution system (9) according to a seventh aspect includes the arc detection device (1) according to the first or second aspect and a socket (6). A target circuit (52) is arranged on the system power supply (3) side of a socket (61) of the socket (6).

[0082] According to the power distribution system (9) of the above aspect, it is possible to distinguish and determine improper installation or a malfunction on the distribution board side of the outlet (61) from a malfunction on the load device (4) side of the outlet (61).

[0083] A power distribution system (9a) according to an eighth aspect includes the arc detection device (1) according to the first or second aspect and a socket (6). A target circuit (52) is disposed between the socket (6) and a load device (4).

[0084] According to the power distribution system (9a) of the above aspect, it is possible to distinguish and determine improper installation or a malfunction on the distribution board (2) side of the outlet (6) from a malfunction on the load device (4) side of the outlet (6). [Explanation of symbols]

[0085] 1 Arc detection device 11 Voltage waveform acquisition section 12 Current waveform acquisition section 13 Judgment section 3 grid power supply 4 Load equipment 52 Target circuit 21 Main breaker 211 Input terminal 212 Output terminal 22 Busbar 23 Branch breaker 231 Input terminal 232 Output terminal 9, 9a Power Distribution System 6 power outlets 61 Outlet

Claims

1. a voltage waveform acquisition unit that acquires a voltage waveform of a voltage applied to a target circuit between the system power supply and the load device; a current waveform acquisition unit that acquires a current waveform of a current flowing through the target circuit; a determination unit that determines whether an arc has occurred based on the voltage waveform and the current waveform, the determination unit determines whether the arc has occurred on the system power supply side or the load device side of the target circuit based on whether the voltage waveform is a sine wave or not. Arc detection device.

2. The determination unit If the voltage waveform is a sine wave, it is determined that the arc has occurred on the load device side of the target circuit; If the voltage waveform is not a sine wave, it is determined that the arc has occurred on the system power supply side of the target circuit. The arc detection device of claim 1 .

3. The arc detection device according to claim 1 or 2; a main breaker; The target circuit is located closer to the load device than the input terminal of the main breaker. Distribution board system.

4. The target circuit is disposed between the input terminal of the main breaker and the output terminal of the main breaker. The distribution board system according to claim 3 .

5. Further provided with a branch breaker, The target circuit is arranged between an input terminal of the branch breaker and an output terminal of the branch breaker. The distribution board system according to claim 3 .

6. A branch breaker; a bus bar disposed between the main breaker and the branch breaker; Further provided with The target circuit is the bus bar. The distribution board system according to claim 3 .

7. The arc detection device according to claim 1 or 2; an electrical outlet; the target circuit is arranged closer to the power supply system than the outlet. Power distribution system.

8. The arc detection device according to claim 1 or 2; an electrical outlet; the target circuit is disposed between the outlet and the load device; Power distribution system.

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