Electric power measurement system and distribution board

Abstract

To be capable of detecting false constructions.SOLUTION: A power measurement system 10 comprises a voltage processing unit, a current detector 8A, and a determination part. The voltage processing unit measures input voltage applied to the first trunk line, which is one of the plurality of trunk lines TLA and TLB supplied with power from each of the plurality of power sources PsA and PsB, and transmits or receives a confirmation signal via the first trunk line. The current detector 8A detects the input current flowing in a branch circuit branching from the second trunk line, which is one of the plurality of trunk lines TLA and TLB, and transmits or receives a confirmation signal via the second trunk line. The determination part performs determination processing to determine whether the first trunk line and the second trunk line are the same trunk line by having either the voltage processing section or the current detector 8A transmit a confirmation signal, and whether the one of the voltage processing unit and the current detector 8A that has not had a confirmation signal transmitted receives a confirmation signal or not.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present disclosure relates to a power measurement system and a distribution board, and more particularly, to a power measurement system and a distribution board that calculate power from measurement results of voltage and current.

Background Art

[0002] The power measurement system described in Patent Document 1 includes a processing unit and a communication unit. The processing unit obtains the power of a circuit according to an operation program based on the detection result of a current detector that detects the current flowing through the circuit. The communication unit outputs information regarding the detection result of the current detector or receives an input of information regarding the detection result of the current detector.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In a power measurement system as described in Patent Document 1, if the current detector is erroneously installed in a circuit different from the circuit to be measured, the current flowing through the circuit to be measured cannot be correctly measured. Therefore, there has been a desire to detect such an erroneous installation.

[0005] In view of the above reasons, the present disclosure is made, and an object thereof is to provide a power measurement system and a distribution board capable of detecting an erroneous installation.

Means for Solving the Problems

[0006] A power measurement system according to an aspect of the present disclosure includes a voltage processing unit, a current detector, and a determination unit. The voltage processing unit measures an input voltage applied to a first main line, which is any one of a plurality of main lines supplied with power from each of a plurality of power sources, and transmits or receives a confirmation signal via the first main line. The current detector detects an input current flowing through a branch circuit branched from a second main line, which is any one of the plurality of main lines, and transmits or receives the confirmation signal via the second main line. The determination unit causes either the voltage processing unit or the current detector to transmit the confirmation signal, and determines whether the first main line and the second main line are the same main line by determining whether the one that has not transmitted the confirmation signal among the voltage processing unit and the current detector receives the confirmation signal, thereby performing a determination process.

[0007] A distribution board according to an aspect of the present disclosure includes the power measurement system and a cabinet. The cabinet houses at least the voltage processing unit and the current detector included in the power measurement system.

Advantages of the Invention

[0008] According to the present disclosure, there is an advantage that incorrect installation can be detected.

Brief Description of the Drawings

[0009]

Figure 1

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Figure 10

[0010] The power measurement system 10 according to an embodiment of the present disclosure will be described in detail with reference to the drawings. Note that the embodiments and modifications described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiments and modifications. Even outside these embodiments and modifications, various changes can be made according to the design and the like as long as the technical idea of the present disclosure is not deviated. Further, the following embodiments (including modifications) may be realized in appropriate combinations.

[0011] (1) Overview First, the overview of the power measurement system 10 according to the present embodiment will be described with reference to FIGS. 1 to 3, which are schematic block diagrams. In FIGS. 1 to 3, the lines connecting the blocks indicate the electrical connection relationship between the blocks, and may be different from the actual number of electric wires.

[0012] The power measurement system 10 is disposed and used, for example, in a distribution board 100 in a facility of a consumer such as a factory or an office. Note that the power measurement system 10 may be applied to a residential facility such as an apartment house.

[0013] As shown in FIGS. 1 and 2, the power measurement system 10 includes a voltage processing unit 12A, a current detector 81A, and a determination unit 16A. Note that the voltage processing unit 12A and the current detector 81A are housed in a cabinet 200 included in the distribution board 100.

[0014] The voltage processing unit 12A measures the input voltage applied to the first main line, which is either the main line TLA or the main line TLB that is supplied with power from each of the power supplies PsA and PsB. In other words, the first main line is the main line that is the measurement target of the voltage processing unit 12A among the main lines TLA and TLB. Also, the voltage processing unit 12A transmits or receives a confirmation signal via the first main line. Details of the transmission and reception of the confirmation signal in the power measurement system 10 will be described later in this section.

[0015] The current detector 81A detects the input current flowing through the branch circuit branched from the second main line, which is either the main line TLA or the main line TLB. In other words, the second main line is the main line that is the branch source of the branch circuit that is the detection target of the current detector 81A among the main lines TLA and TLB. Also, the current detector 81A transmits or receives a confirmation signal via the second main line.

[0016] Here, in a state where the power measurement system 10 as shown in FIG. 1 is correctly installed (hereinafter, the normal installation state), the voltage processing unit 12A and the current detector 81A used for power measurement of a certain branch circuit are installed such that the first main line and the second main line are the same main line (for example, the main line TLA). Thereby, the power measurement system 10 can measure the power supplied from the power supply PsA to the load 21A via the branch circuit C1A of the main line TLA.

[0017] Next, an example of a case where the power measurement system 10 is erroneously installed such that the first main line and the second main line are different will be described with reference to FIG. 3.

[0018] In a miswired state as shown in FIG. 3 (hereinafter referred to as a miswired state), the voltage processing unit 12A used for power measurement of the branch circuits C1A to C4A of the main line TLA is installed to measure the input voltage applied to the main line TLA. That is, the first main line is TLA. On the other hand, the current detector 81A used for power measurement of the branch circuit C1A of the main line TLA is, in principle, installed to detect the input current flowing through the branch circuit C1A as shown in FIG. 1, but is erroneously provided to detect the input current flowing through the branch circuit C1B of the main line TLB. That is, in the miswired state, the second main line corresponding to the current detector 81A is the main line TLB.

[0019] In such a miswired state where the first main line and the second main line are different, the power measurement system 10 cannot correctly measure the power supplied from the power supply PsA to the load 21A via the branch circuit C1A of the main line TLA.

[0020] In this embodiment, the determination unit 16 performs a process of detecting such miswiring. Specifically, the determination unit 16 causes either the voltage processing unit 12A or the current detector 81A to transmit a confirmation signal. The determination unit 16 performs a determination process of determining whether the first main line and the second main line are the same main line based on whether the untransmitted one of the voltage processing unit 12A and the current detector 81A receives the confirmation signal. Thereby, the power measurement system 10 can detect miswiring.

[0021] (2) Details (2.1) Configuration Hereinafter, the configuration of the power measurement system 10 of this embodiment will be described with reference to FIGS. 1 and 2. Note that the following description is based on the premise that the power measurement system 10 is in a correctly wired state.

[0022] As shown in FIG. 1, the power measurement system 10 of this embodiment includes a basic unit 1A which is a power measurement device. The basic unit 1A measures the power supplied from the power supply PsA, for example, in a single-phase three-wire system. Note that the basic unit 1A may be configured to measure the power supplied in a three-phase three-wire system.

[0023] Power from the power supply PsA is supplied through the main line TLA. From the main line TLA, branch circuits C1A to C4A branch out in parallel with each other by, for example, four branch breakers 4A. The main line TLA includes a first voltage line L1, a second voltage line L2, and a neutral line LN. In this embodiment, as an example, it is assumed that four loads (loads 21A to 24A) are respectively connected to the branch circuits C1A to C4A.

[0024] The basic unit 1A, which is a power measurement device, has a voltage input terminal 11A, a current input terminal 13A, and a control unit 6A.

[0025] As shown in FIG. 1, the voltage input terminal 11A is electrically connected to the main line TLA. An input voltage applied from the power supply PsA to the main line TLA is input to the voltage input terminal 11A. The input voltage applied to the main line TLA is applied to each of the branch circuits C1A to C4A via each branch breaker 4A. Note that a breaker may be provided on the circuit between the main line TLA and the voltage input terminal 11A.

[0026] The current input terminal 13A includes, for example, four terminals (terminals 71A to 74A). A current detector 8A can be connected to each of the terminals 71A to 74A via an output line L3. Here, the side of the output line L3 for connecting the current detector is branched, and two current detectors 8A can be connected. That is, each of the terminals 71A to 74A can connect two current detectors 8A.

[0027] The current detector 8A is, for example, a current transformer (CT). In a normal construction state, four current detectors 8A (current detectors 81A to 84A) are respectively attached to the branch circuits C1A to C4A branching from the main line TLA. That is, the second main line, which is the main line where the branch circuits to be detected by the current detectors 81A to 84A branch off, is the main line TLA.

[0028] Current detectors 81A and 82A installed in branch circuits C1A and C2A respectively are connected to terminal 71A via output line L3. Current detectors 83A and 84A installed in branch circuits C3A and C4A respectively are connected to terminal 72A via output line L3.

[0029] Hereinafter, as an example, the current detector 81A attached to the branch circuit C1A will be described. Since the current detectors 82A to 84A also have the same configuration as the current detector 81A, the description will be omitted here for simplicity.

[0030] As shown in FIGS. 4 and 5, the current detector 81A includes a main body portion 40, a lead wire 41, and a holding portion 42.

[0031] The main body portion 40 houses a current detection portion 50 (see FIG. 2) for detecting current therein. The main body portion 40 has a main body lower portion 401 and a main body upper portion 402. The main body lower portion 401 is formed, for example, in a rectangular box shape. The main body upper portion 402 is formed in a rectangular box shape whose length in one direction (hereinafter referred to as direction DR1) in FIG. 4 is shorter than that of the main body lower portion 401. The main body upper portion 402 has an opening portion 403 that opens downward. The cross section of the opening portion 403 perpendicular to the direction DR1 is, for example, U-shaped. Further, the main body upper portion 402 has a fitting portion 405 that fits with the fitting protrusion 404 provided on the main body lower portion 401.

[0032] The current detector 81A is attached to the covered electric wire to be measured such that the direction DR1 substantially coincides with the axial direction of the covered electric wire to be measured. Specifically, with the covered electric wire to be measured accommodated in the opening 403 such that the direction DR1 substantially coincides with the axial direction of the covered electric wire to be measured, the fitting projection 404 of the lower body 401 and the fitting portion 405 of the upper body 402 are fitted together, whereby the current detector 81A is attached to the covered electric wire to be measured. In the present embodiment, the current detector 81A is attached to the covered electric wire L01 among the covered electric wires L01 and L02 included in the branch circuit C1A. That is, the current detector 81A is attached to the covered electric wire L01 such that the direction DR1 substantially coincides with the axial direction of the covered electric wire L01. The covered electric wires L01 and L02 are covered electric wires that are electrically connected to the first voltage line L1 and the neutral line LN (see FIG. 1) of the main line TLA that supplies power in a single-phase three-wire system, respectively. Note that the covered electric wire L01 may be electrically connected to the second voltage line L2.

[0033] The current detection unit 50 accommodated in the main body 40 outputs, to the terminal 71A, an input signal that is a current signal corresponding to the input current flowing through the covered electric wire L01 via the lead wire 41 extending from the inside to the outside of the lower body 401 and the output line L3 connected to the lead wire 41. Note that since well-known techniques are used for the detection of the input current by the current detection unit 50 and the input of the input signal, detailed description thereof is omitted here.

[0034] The coated wire L02 without the current detector 81A attached is held by the holding part 42. The holding part 42 is, for example, a part having a shape with a part of a cylinder missing with the direction DR1 as the axial direction, and is fixed to the side surface of the lower part 401 of the main body by a fixing member such as a screw. Note that the holding part 42 may be formed continuously with the lower part 401 of the main body. The holding part 42 holds the coated wire L02 so that the axial direction of the coated wire L02 substantially coincides with the axial direction DR1 of the holding part 42. That is, the axial direction of the part accommodated in the opening 403 of the coated wire L01 and the axial direction of the part held by the holding part 42 of the coated wire L02 are both the direction DR1 and are parallel to each other. Here, the "parallel" mentioned here is not limited to a completely parallel state, but also includes a state deviated by about several degrees from the parallel state.

[0035] The current detector 81A further has a signal receiving part 51 that receives a confirmation signal SA transmitted from a signal output part 122A provided in a control part 6A described later via a main line TLA. Here, the confirmation signal SA from the signal output part 122A is an alternating voltage signal applied between the first voltage line L1 and the neutral line LN and between the second voltage line L2 and the neutral line LN. The confirmation signal SA applied between the first voltage line L1 and the neutral line LN and the confirmation signal SA applied between the second voltage line L2 and the neutral line LN are applied simultaneously, for example. Also, the confirmation signal SA applied between the first voltage line L1 and the neutral line LN and the confirmation signal SA applied between the second voltage line L2 and the neutral line LN may be transmitted in a time-division manner. That is, the confirmation signal SA is applied between the coated wire L01 and the coated wire L02. Note that the confirmation signal may be a pulse voltage signal.

[0036] As shown in FIG. 5, the signal receiving unit 51 includes a capacitor Cp (such as a single-layer ceramic capacitor) having two flat plate electrodes P1 and P2 that are parallel to each other and have the same area. In FIG. 5, the components of the signal receiving unit 51 other than the capacitor Cp are not shown. The signal receiving unit 51 is provided inside the lower part 401 of the main body such that the two flat plate electrodes P1 and P2 face the covered wire L01 and the covered wire L02, respectively. Here, the capacitor Cp is arranged such that the shortest distance D1 between the flat plate electrode P1 and the covered wire L01 is equal to the shortest distance D2 between the flat plate electrode P2 and the covered wire L02.

[0037] The signal receiving unit 51 outputs a response signal RA corresponding to the received confirmation signal SA to the terminal 71A via the output line L3. The reception operation of the confirmation signal SA and the input operation of the response signal RA by the signal receiving unit 51 will be described in detail in “(2.2) Operation Explanation of the Determination Process”.

[0038] The control unit 6A can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. That is, by one or more processors executing one or more programs (applications) stored in one or more memories, it functions as the control unit 6A. The program is recorded in advance in the memory of the control unit 6A here, but may be provided by being recorded through an electric communication line such as the Internet or on a non-temporary recording medium such as a memory card.

[0039] The control unit 6A includes a voltage processing unit 12A having a voltage measurement unit 121A and a signal output unit 122A, a current measurement unit 14A, a signal processing unit 60A, a power calculation unit 15A, a determination unit 16, and a storage unit 30A. In FIG. 2, the voltage processing unit 12A, the voltage measurement unit 121A and the signal output unit 122A included in the voltage processing unit 12A, the current measurement unit 14A, the signal processing unit 60A, the power calculation unit 15A, and the determination unit 16 do not show a physical configuration, but show the functions realized by the control unit 6A.

[0040] The voltage measurement unit 121A measures the input voltage input from the main line TLA to the voltage input terminal 11A. That is, the first main line that is the measurement target of the voltage measurement unit 121A is the main line TLA. The measurement result of the input voltage by the voltage measurement unit 121A is stored in the storage unit 30A.

[0041] The signal output unit 122A transmits (outputs) the confirmation signal SA via the voltage input terminal 11A and the main line TLA which is the first main line. Here, the confirmation signal SA is, for example, a voltage signal. Further, the confirmation signal SA includes identification information (for example, a frequency unique to the transmission source of the confirmation signal SA) for identifying the voltage processing unit 12A including the signal output unit 122A which is the transmission source. The confirmation signal SA which is a voltage signal transmitted from the signal output unit 122A is received by the current detectors 81A to 84A provided in each of the branch circuits C1A to C4A branched from the main line TLA as described above.

[0042] The current measurement unit 14A measures the input current flowing through each of the branch circuits C1A to C4A based on the input signals input from the current detectors 81A and 82A to the terminal 71A and the input signals input from the current detectors 83A and 84A to the terminal 72A. The measurement result of the input current by the current measurement unit 14A is stored in the storage unit 30A.

[0043] The signal processing unit 60A detects the identification information included in the confirmation signal SA corresponding to the response signal RA based on the response signal RA input from the current detectors 81A and 82A to the terminal 71A and the response signal RA input from the current detectors 83A and 84A to the terminal 72A.

[0044] The power calculation unit 15A calculates the active power consumed by each of the loads 21A to 24A and the apparent power supplied to each of the loads 21A to 24A based on the measurement results of the input voltage measured by the voltage measurement unit 121A and the input current measured by the current measurement unit 14A.

[0045] The determination unit 16 performs a determination process. Since the determination process includes a process by communication between the basic unit 1A and a heterogeneous system unit 1B described later, it will be described after the heterogeneous system unit 1B is described in this section.

[0046] The basic unit 1A further includes an external communication unit 31 that transmits the determination result of the determination process by the determination unit 16 to the external device 90. Here, the external device 90 with which the external communication unit 31 communicates is an information terminal such as a smartphone, a tablet terminal, a wearable terminal, or a personal computer.

[0047] The external communication unit 31 is a communication module controlled by the control unit 6A. Specifically, the external communication unit 31 is a communication module configured to perform short-range wireless communication with the external device 90 by a communication method compliant with, for example, the BLE (Bluetooth (Registered Trademark) Low Energy) standard. "BLE" is a name for the low power consumption specification in the specification of Bluetooth (Registered Trademark), which is a wireless PAN (Personal Area Network) technology. Note that the communication method of the external communication unit 31 is not limited to BLE, and may be a communication method compliant with communication standards such as ZigBee (Registered Trademark), a specific low power wireless station in the 920 MHz band (a wireless station that does not require a license), or Wi-Fi (Registered Trademark) as long as it is a communication method that does not require a license for a wireless station. In addition, the external communication unit 31 may be a communication module that performs wired communication with the external device 90 via a communication cable.

[0048] Also, as shown in FIGS. 1 and 2, the power measurement system 10 further includes a display setting unit 9 connected to the basic unit 1A. The display setting unit 9 is connected to the insertion port 17 provided in the basic unit 1A. The basic unit 1A and the display setting unit 9 communicate with each other by wired communication. Note that the basic unit 1A and the display setting unit 9 may communicate with each other by wireless communication.

[0049] The display setting unit 9 includes an input unit 91 and a display unit 92.

[0050] The input unit 91 receives input from the user of the power measurement system 10. When the input unit 91 receives input from the user, the determination unit 16 performs a determination process. The input unit 91 includes, for example, a plurality of buttons, and in this case, "input" indicates the pressing operation of the plurality of buttons. Note that the input unit 91 may receive the user's input from an external device 90 such as a smartphone via, for example, the external communication unit 31.

[0051] The display unit 92 is a display such as a liquid crystal display or an organic EL (Electroluminescence) display. The display unit 92 displays the determination result of the determination process by the determination unit 16. Note that the display unit 92 may display, for example, the calculation results of the active power and the apparent power by the power calculation unit 15A and the power calculation unit 15B provided in the different system unit 1B described later.

[0052] As shown in FIGS. 1 and 2, the power measurement system 10 includes a different system unit 1B connected to the basic unit 1A. The different system unit 1B has a connection unit 18, and the additional connection unit 19 provided in the basic unit 1A is connected to the connection unit 18. The basic unit 1A and the different system unit 1B communicate with each other, for example, by wired communication. Note that the basic unit 1A and the different system unit 1B may communicate with each other by wireless communication.

[0053] The different system unit 1B is a power measurement device, and measures the power supplied from the power source PsB in, for example, a three-phase three-wire system. Note that the different system unit 1B may be configured to measure the power supplied in a single-phase three-wire system.

[0054] The power from the power source PsB is supplied through the main line TLB. From the main line TLB, branch circuits C1B to C4B are branched in parallel with each other by, for example, four branch breakers 4B. The main line TLB includes the R-phase wire Tr, the S-phase wire Ts, and the T-phase wire Tt. In the present embodiment, as an example, a case where one load (load 21B) is connected to the branch circuit C1B is assumed.

[0055] The heterogeneous system unit 1B includes a voltage input terminal 11B, a current input terminal 13B, and a control unit 6B.

[0056] As shown in FIG. 1, the voltage input terminal 11B is electrically connected to the main line TLB. An input voltage applied from the power supply PsB to the main line TLB is input to the voltage input terminal 11B. The input voltage applied to the main line TLB is applied to each of the branch circuits C1B to C4A via each branch breaker 4B. Note that a breaker may be provided on the circuit between the main line TLB and the voltage input terminal 11B.

[0057] The current input terminal 13B includes, for example, four terminals (terminals 71B to 74B). A current detector 8B can be connected to each of the terminals 71B to 74B via an output line L3.

[0058] In the present embodiment, one current detector 8B (current detector 81B) is attached to the branch circuit C1B branched from the main line TLB. That is, the branch source of the branch circuit to be detected by the current detector 81B is the main line TLB, and the main line TLB is the second main line.

[0059] The current detector 81B is connected to the terminal 71B via the output line L3.

[0060] As shown in FIGS. 1, 2, and 6, the current detector 81B includes current detectors 81C and 82C having the same configuration as the current detector 8A. The current detectors 81C and 82C are connected to the terminal 71B via the output line L3. That is, the current detector 81B is connected to the terminal 71B via the output line L3.

[0061] As shown in FIG. 6, the current detectors 81C and 82C are attached to the covered wires L11 and L13 among the covered wires L11 to L13 included in the branch circuit C1B. The covered wire L12 is held by the holding portion 42 of the current detector 81C. Here, the covered wires L11 to L13 are covered conductors that are electrically connected to the R-phase wire Tr, the S-phase wire Ts, and the T-phase wire Tt (see FIG. 1) of the main line TLB that supplies power in a three-phase three-wire system, respectively.

[0062] Each current detection unit 50 (see FIG. 2) of the current detectors 81C and 82C outputs an input signal corresponding to the input current flowing through the covered wire L11 and the covered wire L13 to the terminal 71B via the output line L3.

[0063] The signal receiving unit 51 (see FIG. 2) of the current detector 81C receives the confirmation signal SB transmitted from the signal output unit 122B provided in the control unit 6B described later via the main line TLB. Here, the confirmation signal SB from the signal output unit 122B is an alternating current signal applied between the R-phase wire Tr and the S-phase wire Ts. That is, the confirmation signal SB is applied between the covered wire L11 and the covered wire L12. Further, the signal receiving unit 51 of the current detector 81C outputs a response signal RB, which is an alternating voltage signal corresponding to the received confirmation signal SB, to the terminal 71B via the output line L3.

[0064] The control unit 6B can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. That is, by one or more processors executing one or more programs (applications) stored in one or more memories, it functions as the control unit 6B. The program is recorded in advance in the memory of the control unit 6B here, but may be provided by being recorded through an electrical communication line such as the Internet or on a non-transitory recording medium such as a memory card.

[0065] The control unit 6B includes a voltage processing unit 12B having a voltage measurement unit 121B and a signal output unit 122B, a current measurement unit 14B, a signal processing unit 60B, a power calculation unit 15B, and a storage unit 30B.

[0066] The voltage measurement unit 121B measures the input voltage input from the main line TLB to the voltage input terminal 11B. That is, the first main line that is the measurement target of the voltage measurement unit 121B is the main line TLB. The measurement result of the input voltage by the voltage measurement unit 121B is stored in the storage unit 30B.

[0067] The signal output unit 122B transmits a confirmation signal SB, which is a voltage signal, via the voltage input terminal 11B and the main line TLB, which is the first main line. The confirmation signal SB includes identification information (for example, a frequency unique to the voltage processing unit 12B) for identifying the voltage processing unit 12B, which is the transmission source. The confirmation signal SB transmitted from the signal output unit 122B is received by the current detector 81B provided in the branch circuit C1B.

[0068] The current measurement unit 14B measures the input current flowing through the branch circuit C1B based on the input signal input from the current detector 81B to the terminal 71B. The measurement result of the input current by the current measurement unit 14B is stored in the storage unit 30B.

[0069] The signal processing unit 60B detects the identification information included in the confirmation signal SB corresponding to the response signal RB based on the response signal RB input from the current detector 81B to the terminal 71B.

[0070] The power calculation unit 15B calculates the active power consumed by the load 21B and the apparent power supplied to the load 21B based on the measurement results of the input voltage measured by the voltage measurement unit 121B and the input current measured by the current measurement unit 14B.

[0071] Here, the determination process performed by the determination unit 16 included in the control unit 6A described above will be described.

[0072] First, as described above, the power measurement system 10 includes voltage processing units 12A and 12B, and current detectors 81A to 84A, 81B. The voltage measurement units 121A of the voltage processing unit 12A and the voltage measurement unit 121B of the voltage processing unit 12B measure the input voltages applied to the two first main lines (main lines TLA and TLB), respectively. The current detectors 81A to 84A, 81B detect the input currents flowing through the five branch circuits corresponding to each of them, respectively. The five branch circuits branch from the second main lines corresponding to each of them. In this embodiment, the second main line from which each of the five branch circuits branches is either the main line TLA or the main line TLB. For example, in the normal construction state as shown in FIG. 1, the second main lines from which the four branch circuits corresponding to the current detectors 81A to 84A branch are both the main line TLA, and the second main line from which the one branch circuit corresponding to the current detector 81B branches is the main line TLB.

[0073] Here, in the determination process, the determination unit 16 determines whether the first main line, which is the main line to be measured by the voltage measurement unit 121A, and the second main line, which is the branch source of each of the four branch circuits to be detected by the current detectors 81A to 84A, are the same main line. The determination unit 16 causes the signal output unit 122A to transmit a confirmation signal SA via the first main line, and checks whether each of the current detectors 81A to 84A receives the confirmation signal SA via the second main line.

[0074] Further, in the determination process, the determination unit 16 determines whether the first main line, which is the main line to be measured by the voltage measurement unit 121B, and the second main line, which is the branch source of the branch circuit to be detected by the current detector 81B, are the same main line. The determination unit 16 causes the signal output unit 122B to transmit the confirmation signal SB to the first main line, and checks whether the current detector 81B receives the confirmation signal SB via the second main line. In other words, in the determination process, the determination unit 16 causes the signal output units 122A and 122B to transmit the confirmation signals SA and SB respectively, and checks whether the current detectors 81A to 84A receive the confirmation signal SA, and whether the current detector 81C included in the current detector 81B receives the confirmation signal SB. Thereby, among the two first main lines (main lines TLA and TLB in this embodiment) that are the measurement targets of the voltage measurement units 121A and 121B respectively, and the second main lines that are the branch sources of the five branch circuits where the current detectors 81A to 84A and 81B are installed respectively, a combination of the first main line and the second main line that are the same main line is obtained.

[0075] (2.2) Operation Explanation of Determination Process The operation of the determination process by the determination unit 16 included in the power measurement system 10 of this embodiment will be described based on FIGS. 1 to 3 and FIG. 7 which is a flowchart.

[0076] First, the user of the power measurement system 10 presses one or more buttons provided in the input unit 91 of the display setting unit 9 to shift the electric measurement system 10 to the test mode (ST1).

[0077] When the power measurement system 10 shifts to the test mode, the determination unit 16 causes the signal output units 122A and 122B to transmit the confirmation signals SA and SB via the first main line (ST2). Specifically, the determination unit 16 causes the signal output unit 122A to transmit the confirmation signal SA via the voltage input terminal 11A and the main line TLA which is the first main line, and causes the signal output unit 122B to transmit the confirmation signal SB via the voltage input terminal 11B and the main line TLB which is the first main line. The transmission of the confirmation signal SA by the signal output unit 122A and the transmission of the confirmation signal SB by the signal output unit 122B are executed, for example, at the same timing. Here, as described above, the confirmation signal SA is an AC voltage signal applied between the first voltage line L1 of the main line TLA and the neutral line LN, and between the second voltage line L2 and the neutral line LN. The confirmation signal SA is a voltage signal having a frequency fa unique to the voltage processing unit 12A provided in the signal output unit 122A which is the transmission source. Also, as described above, the confirmation signal SB is an AC voltage signal applied between the wire Tr of the R phase and the wire Ts of the S phase of the main line TLB. The confirmation signal SB is a voltage signal having a frequency fb unique to the voltage processing unit 12B provided in the signal output unit 122B which is the transmission source. Note that the frequency fa and the frequency fb are frequencies sufficiently higher than the commercial power supply frequency (50 Hz or 60 Hz) of the input voltage supplied from the power supplies PsA and PsB.

[0078] Hereinafter, the determination operation will be described by dividing it into the case where the power measurement system 10 is in a normal construction state as shown in FIG. 1 and the case where it is in a misconstruction state as shown in FIG. 3.

[0079] First, the case where the power measurement system 10 is in a normal construction state will be described.

[0080] The confirmation signal SA transmitted from the signal output unit 122A is applied to each of the branch circuits C1A to C4A branched from the main line TLA, and the confirmation signal SB transmitted from the signal output unit 122B is applied to the branch circuit C1B branched from the main line TLB. Then, the confirmation signal SA is received by each of the current detectors 81A to 84A, and the confirmation signal SB is received by the current detector 81C included in the current detector 81B. That is, the confirmation signal SA is received by each of the current detectors 81A to 84A via the main line TLA which is the second main line, and the confirmation signal SB is received by the current detector 81C via the main line TLB which is the second main line (ST3).

[0081] Here, the reception operation of the confirmation signal by the current detector will be described taking the current detector 81A as an example. When the confirmation signal SA is applied to the branch circuit C1A, an AC voltage with a frequency fa is applied between the covered wire L01 connected to the first voltage line L1 of the main line TLA and the covered wire L02 connected to the neutral line LN of the main line TLA. At this time, as shown in FIG. 5, since the flat electrode P1 of the capacitor Cp included in the signal reception unit 51 and the covered wire L01 face each other with a space therebetween, they have a parasitic capacitance. Also, since the flat electrode P2 of the capacitor Cp and the covered wire L02 face each other with a space therebetween, they have a parasitic capacitance. As a result, polarization occurs between the flat electrode P1 and the covered wire L01 and between the flat electrode P2 and the covered wire L02, and a response signal RA which is an AC voltage signal having a frequency of the frequency fa and a phase the same as that of the confirmation signal SA is generated between the flat electrode P1 and the flat electrode P2. That is, the current detector 81A receives the confirmation signal SA and converts it into the response signal RA.

[0082] The signal reception unit 51 transmits (inputs) the response signal RA to the terminal 71A via the output line L3 (ST4). Similarly, the signal reception unit 51 included in the current detector 82A transmits the response signal RA to the terminal 71A, and the signal reception units 51 included in the current detectors 83A and 84A transmit the response signal RA to the terminal 72A. Also, the signal reception unit 51 included in the current detector 81C transmits the response signal RB to the terminal 71B. Here, the response signal RB is an AC voltage signal having a frequency of the frequency fb and a phase the same as that of the confirmation signal SB.

[0083] The signal processing unit 60A analyzes the frequency of the response signal RA input to each of the terminals 71A and 72A (ST5). The signal processing unit 60B analyzes the frequency of the response signal RB input to the terminal 71B (ST5).

[0084] The determination unit 16 determines whether the frequency of the response signal RA input to each of the terminals 71A and 72A analyzed by the signal processing unit 60A matches the frequency of the confirmation signal SA output by the signal output unit 122A (ST6). Further, the determination unit 16 determines whether the frequency of the response signal RB input to the terminal 71B analyzed by the signal processing unit 60B matches the frequency of the confirmation signal SB output by the signal output unit 122B (ST6).

[0085] Here, as described above, the frequencies of the confirmation signal SA and the response signal RA are the frequency fa. Therefore, the determination unit 16 determines that the frequency of the response signal RA input to each of the terminals 71A and 72A matches the frequency of the confirmation signal SA output by the signal output unit 122A (ST6: Yes). In other words, the determination unit 16 determines that the current detectors 81A and 82A connected to the terminal 71A and the current detectors 83A and 84A connected to the terminal 72A have received the confirmation signal SA. From this result, the determination unit 16 determines that the first main line (main line TLA) involved in the transmission of the confirmation signal SA and the second main line (main line TLA) involved in the reception of the confirmation signal SA are the same main line (ST7).

[0086] Also, the frequencies of both the confirmation signal SB and the response signal RB are the frequency fb. Therefore, the determination unit 16 determines that the frequency of the response signal RB input to the terminal 71B matches the frequency of the confirmation signal SB output by the signal output unit 122B (ST6: Yes). In other words, the determination unit 16 determines that the current detector 81C of the current detector 81B connected to the terminal 71B has received the confirmation signal SB. From this result, the determination unit 16 determines that the first main line (main line TLB) involved in the transmission of the confirmation signal SB and the second main line (main line TLB) involved in the reception of the confirmation signal SB are the same main line (ST7).

[0087] When the determination unit 16 has completed the determination of the match and mismatch between the first main line and the second main line, it causes the display unit 92 to display the determination result in the determination process (ST9). Note that the determination result displayed on the display unit 92 may include, in addition to the match or mismatch between the first main line and the second main line, the presence or absence of construction errors in the power measurement system 10 estimated from the determination result of the match or mismatch between the first main line and the second main line. By checking the determination result displayed on the display unit 92, the user of the power measurement system 10 can confirm that the current detectors 81A and 82A connected to the terminal 71A and the current detectors 83A and 84A connected to the terminal 72A are installed in the branch circuit branched from the main line TLA. In addition, the user can confirm that the current detector 81C of the current detector 81B connected to the terminal 71B is installed in the branch circuit branched from the main line TLB. That is, the user can confirm that there is a low possibility of construction errors occurring in the power measurement system 10.

[0088] Next, the case where the power measurement system 10 is in a misconstruction state as shown in FIG. 3 will be described. In the misconstruction state, unlike the normal construction state, the current detector 81C of the current detector 81B connected to the terminal 71B is attached to the covered wire L01 of the branch circuit C1A. Also, the covered wire L02 of the branch circuit C1A is held by the holding portion 42 of the current detector 81C. The current detector 82C of the current detector 81B connected to the terminal 71B is attached to the covered wire L01 of the branch circuit C2A. Also, the covered wire L02 of the branch circuit C2A is held by the holding portion 42 of the current detector 82C. In addition, the current detectors 81A and 82A connected to the terminal 71A are respectively installed on the covered wires L11 and L13 of the branch circuit C1B. Also, the covered wire L12 of the branch circuit C1B is held by the holding portion 42 of the current detector 81A.

[0089] The confirmation signal SA transmitted from the signal output unit 122A is applied to the branch circuits C1A to C4A branched from the main line TLA, respectively, and the confirmation signal SB transmitted from the signal output unit 122B is applied to the branch circuit C1B branched from the main line TLB. Here, the confirmation signal SA is received by each of the current detectors 81C, 82C, 83A, and 84A, and the confirmation signal SB is received by the current detector 81A. That is, the confirmation signal SA is received by the current detectors 81C, 82C, 83A, and 84A via the main line TLA which is the second main line, and the confirmation signal SB is received by the current detector 81A via the main line TLB which is the second main line (ST3).

[0090] The signal receiving unit 51 included in each of the current detectors 81C and 82C transmits a response signal RA corresponding to the confirmation signal SA to the terminal 71B, and the signal receiving unit 51 included in each of the current detectors 83A and 84A transmits the response signal RA to the terminal 72A (ST4). Also, the signal receiving unit 51 included in the current detector 81A transmits a response signal RB corresponding to the confirmation signal SB to the terminal 71A (ST4).

[0091] The signal processing unit 60A analyzes the frequencies of the response signal RB input to the terminal 71A and the response signal RA input to the terminal 72A (ST5). The signal processing unit 60B analyzes the frequency of the response signal RA input to the terminal 71B (ST5).

[0092] The determination unit 16 determines whether or not the frequency of the response signal RB input to the terminal 71A analyzed by the signal processing unit 60A matches the frequency of the confirmation signal SA output by the signal output unit 122A (ST6).

[0093] Also, the determination unit 16 determines whether or not the frequency of the response signal RA input to the terminal 72A analyzed by the signal processing unit 60A matches the frequency of the confirmation signal SA output by the signal output unit 122A (ST6).

[0094] Also, the determination unit 16 determines whether or not the frequency of the response signal RA input to the terminal 71B analyzed by the signal processing unit 60B matches the frequency of the confirmation signal SB output by the signal output unit 122B (ST6).

[0095] Here, as described above, the frequency of the confirmation signal SA and the frequency of the response signal RA are the frequency fa, and the frequency of the confirmation signal SB and the frequency of the response signal RB are the frequency fb.

[0096] Therefore, the determination unit 16 determines that the frequency of the response signal RB input to the terminal 71A does not match the frequency of the confirmation signal SA output by the signal output unit 122A (ST6: No). In other words, the determination unit 16 determines that the current detectors 81A and 82A connected to the terminal 71A have not received the confirmation signal SA. From this result, the determination unit 16 determines that the first main line (main line TLA) intervening in the transmission of the confirmation signal SA and the second main line (main line TLB) intervening in the reception of the confirmation signal SB in the current detectors 81A and 82A connected to the terminal 71A are not the same main line (ST8).

[0097] The determination unit 16 also determines that the frequency of the response signal RA input to the terminal 72A matches the frequency of the confirmation signal SA output by the signal output unit 122A (ST6: Yes). In other words, the determination unit 16 determines that the current detectors 83A and 84A connected to the terminal 72A have received the confirmation signal SA. From this result, the determination unit 16 determines that the first main line (main line TLA) intervening in the transmission of the confirmation signal SA and the second main line (main line TLA) intervening in the reception of the confirmation signal SA in the current detectors 83A and 84A connected to the terminal 72A are the same main line (ST7).

[0098] The determination unit 16 also determines that the frequency of the response signal RA input to the terminal 71B does not match the frequency of the confirmation signal SB output by the signal output unit 122B (ST6: No). In other words, the determination unit 16 determines that the current detectors 81C and 82C connected to the terminal 71B have not received the confirmation signal SB. From this result, the determination unit 16 determines that the first main line (main line TLB) intervening in the transmission of the confirmation signal SB and the second main line (main line TLA) intervening in the reception of the confirmation signal SA in the current detectors 81C and 82C connected to the terminal 71B are not the same main line (ST8).

[0099] When the determination unit 16 has completed the determination of the matching and non-matching of the first main line and the second main line, it causes the display unit 92 to display the determination result in the determination process (ST9). By checking the determination result displayed on the display unit 92, the user of the power measurement system 10 can confirm that the current detectors 81A and 82A connected to the terminal 71A are not installed in the branch circuit branched from the main line TLA, and the current detectors 81C and 82C connected to the terminal 71B are not installed in the branch circuit branched from the main line TLB. That is, the user can confirm that there may be incorrect construction in the power measurement system 10.

[0100] (3) Modification example Hereinafter, a modification example of the above embodiment will be described. However, the same reference numerals are given to the components common to the above embodiment, and the description thereof will be omitted as appropriate. In addition, each configuration of the modification example described below can be applied in appropriate combination with each configuration described in the above embodiment.

[0101] (3.1) Modification example 1 This modification example 1 is different from the above embodiment in that, in the determination operation, the transmission of the confirmation signal by the signal output unit 122A and the transmission of the confirmation signal by the signal output unit 122B are executed in a time-sharing manner. That is, in this modification example 1, the determination unit 16 causes the signal output unit 122A included in the voltage processing unit 12A and the signal output unit 122B included in the voltage processing unit 12B to transmit confirmation signals to each of them in a time-sharing manner in the determination process, and checks whether each of the current detectors 81A to 84A, 81B (81C, 82C) receives the confirmation signal. Thereby, among the two first main lines (main lines TLA and TLB) that are the measurement objects of the voltage measurement units 121A and 121B, respectively, and the five second main lines that are the main lines of the branch circuits where the current detectors 81A to 84A, 81B (81C, 82C) are installed, a combination of the first main line and the second main line that are the same main line is obtained. Thereby, the determination unit 16 obtains a combination of the voltage measurement unit and the current detector connected to the same main line from the plurality of voltage measurement units 121A and 121B and the plurality of current detectors 81A to 84A, 81B (81C, 82C).

[0102] Next, the determination operation in this Modification 1 will be described with reference to FIG. 8 which is a flowchart. Note that the description of operations common to the embodiment will be omitted. Also, in the following description, the case where the power measurement system 10 is in an incorrect construction state as shown in FIG. 3 will be described.

[0103] When the electric power measurement system 10 shifts to the test mode (ST11), the determination unit 16 causes the signal output unit 122A to transmit a first confirmation signal, which is an AC voltage signal having predetermined identification information (amplitude, frequency), via the voltage input terminal 11A and the main line TLA which is the first main line (ST12).

[0104] The first confirmation signal is received by the current detectors 81C, 82C, 83A, 84A via the main line TLA which is the second main line (ST13).

[0105] The signal reception units 51 each included in the current detectors 81C, 82C transmit a first response signal corresponding to the first confirmation signal to the terminal 71B (ST14), and the first response signal is received by the signal processing unit 60B via the terminal 71B. The signal reception units 51 each included in the current detectors 83A, 84A transmit the first response signal to the terminal 72A (ST14), and the first response signal is received by the signal processing unit 60A via the terminal 72A.

[0106] The determination unit 16 determines whether the signal processing unit 60A has received the first response signal via the terminals 71A, 72A (ST15).

[0107] Here, the determination unit 16 determines that the signal processing unit 60A has received the first response signal via the terminal 72A (ST15: Yes). In other words, the determination unit 16 determines that the current detectors 83A, 84A connected to the terminal 72A have received the first confirmation signal. From this result, the determination unit 16 determines that the second main line (main line TLA) where the branch circuits (branch circuits C3A, C4A) to which the current detectors 83A, 84A connected to the terminal 72A are installed branch is the same as the first main line (main line TLA) intervening in the transmission of the first confirmation signal (ST16).

[0108] Also, when the determination unit 16 does not receive the first response signal within a predetermined time after the first confirmation signal is transmitted, the signal processing unit 60A determines that the first response signal has not been received via the terminal 71A (ST15: No). In other words, the determination unit 16 determines that the current detectors 81A and 82A connected to the terminal 71A have not received the first confirmation signal. From this result, the determination unit 16 determines that the second main line (main line TLB) where the branch circuit (branch circuit C1B) in which the current detectors 81A and 82A connected to the terminal 71A are installed branches is not the same as the first main line (main line TLA) involved in the transmission of the first confirmation signal (ST17).

[0109] When the confirmation of the reception of the first response signal is completed, the determination unit 16 causes the signal output unit 122B to transmit a second confirmation signal, which is an alternating voltage signal having the same identification information as the first confirmation signal, via the voltage input terminal 11B and the main line TLB, which is the first main line (ST18). That is, the determination unit 16 causes the first confirmation signal and the second confirmation signal to be transmitted in a time-division manner. Note that the identification information of the second confirmation signal may be different from the identification information of the first confirmation signal. Also, the second confirmation signal may be transmitted when a predetermined time has elapsed after the first confirmation signal is transmitted.

[0110] The second confirmation signal is received by the current detectors 81A and 82A via the main line TLB, which is the second main line (ST19).

[0111] The signal reception unit 51 included in each of the current detectors 81A and 82A transmits a second response signal corresponding to the second confirmation signal to the terminal 71A (ST20), and the second response signal is received by the signal processing unit 60A via the terminal 71A.

[0112] The determination unit 16 determines whether the signal processing unit 60B has received the second response signal via the terminal 71B (ST21). Here, when the determination unit 16 does not receive the second response signal within a predetermined time after the second confirmation signal is transmitted, it determines that the signal processing unit 60B has not received the second response signal via the terminal 71B (ST21: No). In other words, the determination unit 16 determines that the current detectors 81C and 82C connected to the terminal 71B have not received the second confirmation signal. From this result, the determination unit 16 determines that the second main line (main line TLA) where the branch circuits (branch circuits C1A and C2A) in which the current detectors 81C and 82C connected to the terminal 71B are installed branch, and the first main line (main line TLB) intervening in the transmission of the second confirmation signal are not the same (ST23).

[0113] When the confirmation of the reception of the second response signal is completed, the determination unit 16 causes the display unit 92 to display the determination result in the determination process (ST24). By checking the determination result displayed on the display unit 92, the user of the power measurement system 10 can confirm that the current detectors 81A and 82A connected to the terminal 71A are not installed in the branch circuit branching from the main line TLA, and the current detectors 81C and 82C connected to the terminal 71B are not installed in the branch circuit branching from the main line TLB. That is, the user can confirm that there may be a construction error in the power measurement system 10.

[0114] (3.2) Modification Example 2 This modification example 2 is different from the above-described embodiment and modification example 1 in that the confirmation signals transmitted from the signal output units 122A and 122B are alternating current signals in the determination operation.

[0115] For example, the signal output unit 122A transmits (outputs) a confirmation signal SA1 that is an alternating current signal via the voltage input terminal 11A and the main line TLA that is the first main line. The confirmation signal SA1 has a frequency fa1 unique to the voltage processing unit 12A including the signal output unit 122A as the transmission source. Note that the frequency fa1 is a frequency sufficiently higher than the commercial power supply frequency (50 Hz or 60 Hz) of the input voltage supplied from the power supply PsA.

[0116] In the normal construction state as shown in FIG. 1, the confirmation signal SA1 transmitted from the signal output unit 122A is received by the current detectors 81A to 84A provided in each of the branch circuits C1A to C4A. Specifically, the confirmation signal SA1 is received by the current detection units 50 each of the current detectors 81A to 84A has.

[0117] For example, the current detection unit 50 of the current detector 81A outputs a response signal RA1, which is a current signal corresponding to the confirmation signal SA1, to the terminal 71A. The response signal RA1 has the same frequency fa1 as the confirmation signal SA1. Here, the current detection unit 50 of the current detector 81A also inputs an input signal, which is a current signal corresponding to the input current flowing through the branch circuit C1A by the input voltage applied to the main line TLA, to the terminal 71A. That is, the response signal RA1 is superimposed on the input signal corresponding to the input current flowing through the branch circuit C1A and input to the terminal 71A.

[0118] The signal processing unit 60A filters the current signal in which the response signal RA1 is superimposed on the input signal corresponding to the input current flowing through the branch circuit C1A by frequency bands and extracts the response signal RA1. Then, the signal processing unit 60A analyzes the frequency fa1 included in the response signal RA1.

[0119] Note that by setting the loads 21A to 24A to the standby state and transmitting, via the main line TLA, the confirmation signal SA1, which is a larger alternating current signal, from the signal output unit 122A, the possibility of malfunction of the loads 21A to 24A can be reduced while enabling the signal processing unit 60A to detect the response signal RA1 with higher accuracy. In this case, when the user of the power measurement system 10 shifts the electric measurement system 10 to the test mode, a message prompting the loads 21A to 24A to be in the standby state may be displayed on the display unit 92.

[0120] (3.3) Modified Example 3 This Modification Example 3 differs from the above-described Embodiment, Modification Example 1, and Modification Example 2 in the following points. That is, in this Modification Example 3, the determination unit 16 causes the current detectors 81A to 84A to transmit the first to fourth confirmation signals via the second main line, and determines whether the first main line and the second main line are the same main line based on whether the voltage measurement unit 121A included in the voltage processing unit 12A receives the first to fourth confirmation signals via the first main line. Further, the determination unit 16 causes the current detectors 81C and 82C included in the current detector 81B to transmit the fifth and sixth confirmation signals via the second main line, and determines whether the first main line and the second main line are the same main line based on whether the voltage measurement unit 121B included in the voltage processing unit 12B receives the fifth and sixth confirmation signals via the first main line. Note that the first to sixth confirmation signals may have the same identification information (for example, frequency) or may have different identification information from each other.

[0121] Hereinafter, the determination operation in this Modification Example 3 will be described with reference to FIG. 9 which is a flowchart. In the following description, a case where the power measurement system 10 is in a misconstruction state as shown in FIG. 3 will be described.

[0122] In this Modification Example 3, as shown in FIG. 10, the voltage processing units 12A and 12B may not each include the signal output units 122A and 122B. Further, each of the current detectors 81A to 84A has a signal output unit 123A, and each of the current detectors 81C and 82C included in the current detector 81B has a signal output unit 123B. The signal output units 123A and 123B include, for example, coils through which current flows.

[0123] When the electric power measurement system 10 shifts to the test mode (ST31), the determination unit 16 causes the signal output unit 123A included in the current detector 81A to transmit the first confirmation signal via the second main line (main line TLB in FIG. 3) (ST32). As an example, the signal output unit 123A converts a magnetic field generated by passing an alternating current through a coil included in the signal output unit 123A into the first confirmation signal and transmits it.

[0124] The determination unit 16 determines whether the voltage measurement unit 121A included in the voltage processing unit 12A has received a first confirmation signal via the first main line (TLA) that is the measurement target of the voltage measurement unit 121A (ST33). Here, the first confirmation signal is transmitted to the voltage measurement unit 121B via the main line TLB. Therefore, when the determination unit 16 does not receive the first confirmation signal within a predetermined time after the first confirmation signal is transmitted, the determination unit 16 determines that the voltage measurement unit 121A has not received the first confirmation signal via the first main line (main line TLA) (ST33: No). From this result, the determination unit 16 determines that the first main line (main line TLA) that is the measurement target of the voltage measurement unit 121A is not the same as the second main line (main line TLB) intervening in the transmission of the first confirmation signal (ST35).

[0125] When the confirmation of the reception of the first confirmation signal is completed, the determination unit 16 causes the signal output unit 123A included in the current detector 82A to transmit a second confirmation signal via the second main line (main line TLB in FIG. 3) (ST32). Note that the confirmation operation of the reception of the second confirmation signal and the third to sixth confirmation signals described later is the same as the reception confirmation operation of the first confirmation signal, and thus is not shown in FIG. 9 which is a flowchart.

[0126] The determination unit 16 determines whether the voltage measurement unit 121A included in the voltage processing unit 12A has received a second confirmation signal via the first main line (TLA) that is the measurement target of the voltage measurement unit 121A. Here, the second confirmation signal is transmitted to the voltage measurement unit 121B via the main line TLB. Therefore, when the determination unit 16 does not receive the second confirmation signal within a predetermined time after the second confirmation signal is transmitted, the determination unit 16 determines that the voltage measurement unit 121A has not received the second confirmation signal via the first main line (main line TLA). From this result, the determination unit 16 determines that the first main line (main line TLA) that is the measurement target of the voltage measurement unit 121A is not the same as the second main line (main line TLB) intervening in the transmission of the second confirmation signal.

[0127] When the confirmation of the reception of the second confirmation signal is completed, the determination unit 16 causes the signal output unit 123A included in the current detector 83A to transmit a third confirmation signal via the second main line (main line TLA in FIG. 3).

[0128] The determination unit 16 determines whether the voltage measurement unit 121A included in the voltage processing unit 12A has received a third confirmation signal via the first main line (TLA), which is the measurement target of the voltage measurement unit 121A. Here, the third confirmation signal is transmitted to the voltage measurement unit 121A via the main line TLA. Therefore, the determination unit 16 determines that the voltage measurement unit 121A has received the third confirmation signal via the first main line (main line TLA). From this result, the determination unit 16 determines that the first main line (main line TLA), which is the measurement target of the voltage measurement unit 121A, and the second main line (main line TLA) involved in the transmission of the third confirmation signal are the same.

[0129] When the confirmation of the reception of the third confirmation signal is completed, the determination unit 16 causes the signal output unit 123A included in the current detector 84A to transmit a fourth confirmation signal via the second main line (main line TLA in FIG. 3).

[0130] The determination unit 16 determines whether the voltage measurement unit 121A included in the voltage processing unit 12A has received a fourth confirmation signal via the first main line (TLA), which is the measurement target of the voltage measurement unit 121A. Here, the fourth confirmation signal is transmitted to the voltage measurement unit 121A via the main line TLA. Therefore, the determination unit 16 determines that the voltage measurement unit 121A has received the fourth confirmation signal via the first main line (main line TLA). From this result, the determination unit 16 determines that the first main line (main line TLA), which is the measurement target of the voltage measurement unit 121A, and the second main line (main line TLA) involved in the transmission of the fourth confirmation signal are the same.

[0131] When the confirmation of the reception of the fourth confirmation signal is completed, the determination unit 16 causes the signal output unit 123B included in the current detector 81C to transmit a fifth confirmation signal via the second main line (main line TLA in FIG. 3).

[0132] The determination unit 16 determines whether the voltage measurement unit 121B included in the voltage processing unit 12B has received the fifth confirmation signal via the first main line (TLB) that is the measurement target of the voltage measurement unit 121B. Here, the fifth confirmation signal is transmitted to the voltage measurement unit 121A via the main line TLA. Therefore, when the determination unit 16 does not receive the fifth confirmation signal within a predetermined time after the fifth confirmation signal is transmitted, the determination unit 16 determines that the voltage measurement unit 121B has not received the fifth confirmation signal via the first main line (main line TLB). From this result, the determination unit 16 determines that the first main line (main line TLB) that is the measurement target of the voltage measurement unit 121B is not the same as the second main line (main line TLA) involved in the transmission of the fifth confirmation signal.

[0133] When the confirmation of the reception of the fifth confirmation signal is completed, the determination unit 16 causes the signal output unit 123B included in the current detector 82C to transmit a sixth confirmation signal via the second main line (main line TLA in FIG. 3).

[0134] The determination unit 16 determines whether the voltage measurement unit 121B included in the voltage processing unit 12B has received the sixth confirmation signal via the first main line (TLB) that is the measurement target of the voltage measurement unit 121B. Here, the sixth confirmation signal is transmitted to the voltage measurement unit 121A via the main line TLA. Therefore, when the determination unit 16 does not receive the sixth confirmation signal within a predetermined time after the sixth confirmation signal is transmitted, the determination unit 16 determines that the voltage measurement unit 121B has not received the sixth confirmation signal via the first main line (main line TLB). From this result, the determination unit 16 determines that the first main line (main line TLB) that is the measurement target of the voltage measurement unit 121B is not the same as the second main line (main line TLA) involved in the transmission of the sixth confirmation signal.

[0135] When the determination unit 16 finishes confirming the reception of the sixth confirmation signal, it causes the display unit 92 to display the determination result in the determination process (ST33). By checking the determination result displayed on the display unit 92, the user of the power measurement system 10 can confirm that the current detectors 81A and 82A connected to the terminal 71A are not installed in the branch circuit branched from the main line TLA, and the current detectors 81C and 82C connected to the terminal 71B are not installed in the branch circuit branched from the main line TLB. That is, the user can confirm that there may be a construction error in the power measurement system 10.

[0136] (3.4) Other Modification Examples Hereinafter, other modification examples of the embodiment will be listed. The following modification examples may be realized in appropriate combination.

[0137] The power measurement system 10 may further include an audio notification unit that notifies the determination result of the determination process by the determination unit 16 by voice. The audio notification unit is provided in, for example, the display setting unit 9.

[0138] The power measurement system 10 in the present disclosure includes a computer system. The computer system mainly consists of a processor and a memory as hardware. By the processor executing a program recorded in the memory of the computer system, the functions as the power measurement system 10 in the present disclosure are realized. The program may be pre-recorded in the memory of the computer system, may be provided through a telecommunication line, or may be provided by being recorded on a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system. 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). Here, integrated circuits such as the IC or LSI are called differently 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, for an FPGA (Field-Programmable Gate Array) that is programmed after the manufacture of the LSI, or a logic device capable of reconfiguring the bonding relationship inside the LSI or reconfiguring the circuit section inside the LSI, it can also be adopted as a processor. The one or more electronic circuits may be integrated on one chip, or may be provided dispersedly on a plurality of chips. The plurality of chips may be integrated in one device, or may be provided dispersedly in a plurality of devices. The computer system here includes a microcontroller having one or more processors and one or more memories. Therefore, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0139] (4) Summary As described above, the power measurement system (10) according to the first aspect includes a voltage processing unit (12A), a current detector (8A), and a determination unit (16). The voltage processing unit (12A) measures an input voltage applied to a first main line, which is any one of a plurality of main lines (TLA, TLB) supplied with power from each of a plurality of power supplies (PsA, PsB), and transmits or receives a confirmation signal via the first main line. The current detector (8A) detects an input current flowing through a branch circuit branched from a second main line, which is any one of the plurality of main lines (TLA, TLB), and transmits or receives a confirmation signal via the second main line. The determination unit (16) causes either the voltage processing unit (12A) or the current detector (8A) to transmit a confirmation signal, and performs a determination process of determining whether the first main line and the second main line are the same main line based on whether the one that has not been caused to transmit the confirmation signal among the voltage processing unit (12A) and the current detector (8A) receives the confirmation signal.

[0140] According to this aspect, by checking whether the first main line and the second main line are the same main line, it is possible to detect incorrect installation of the power measurement system (10).

[0141] In the power measurement system (10) according to the second aspect, in the first aspect, the confirmation signal is a voltage signal.

[0142] According to this aspect, it is possible to reduce a decrease in the intensity of the confirmation signal due to circuit branching.

[0143] In the power measurement system (10) according to the third aspect, in the second aspect, at least one of the voltage processing unit (12A) and the current detector (8A) has a signal receiving unit (51) that receives a voltage signal.

[0144] According to this aspect, it is possible to receive the confirmation signal, which is a voltage signal, with high precision.

[0145] In the power measurement system (10) according to the fourth aspect, in the first aspect, the confirmation signal is a current signal.

[0146] According to this aspect, in the current detector (8A), a confirmation signal can be detected by the input current detection mechanism, and the structure of the current detector (8A) can be simplified.

[0147] In the power measurement system (10) according to the fifth aspect, in any of the first to fourth aspects, the confirmation signal includes identification information for identifying the voltage processing unit (12A) or the current detector (8A) which is the transmission source.

[0148] According to this aspect, the voltage processing unit (12A) or the current detector (8A) which is the transmission source of the received confirmation signal can be specified.

[0149] The power measurement system (10) according to the sixth aspect includes, in any of the first to fifth aspects, a plurality of voltage processing units (12A, 12B) and a plurality of current detectors (8A, 8B). The plurality of voltage processing units (12A, 12B) measure the input voltage applied to each of a plurality of first main lines which are any of the plurality of main lines (TLA, TLB). The plurality of current detectors (8A, 8B) detect the input current flowing through a plurality of branch circuits branched from each of a plurality of second main lines which are any of the plurality of main lines (TLA, TLB). In the determination process, the determination unit (16) causes any one of each of the plurality of voltage processing units (12A, 12B) and each of the plurality of current detectors (8A, 8B) to transmit a confirmation signal in a time-division manner. The determination unit (16) determines a combination of a first main line and a second main line which are the same main line among the plurality of first main lines and the plurality of second main lines according to whether the party that has not transmitted the confirmation signal among each of the plurality of voltage processing units (12A, 12B) and each of the plurality of current detectors (8A, 8B) receives the confirmation signal.

[0150] According to this aspect, it is possible to detect incorrect installation of the power measurement system (10) without adding identification information to the confirmation signal for the voltage processing unit (12A, 12B) or the current detector (8A, 8B) which is the transmission source.

[0151] In the power measurement system (10) according to the seventh aspect, in any of the first to sixth aspects, an input unit (91) for receiving an input from a user is further provided. The determination unit (16) performs a determination process according to the input.

[0152] According to this aspect, the user can cause the determination unit (16) to perform a determination process at an arbitrary timing.

[0153] The power measurement system (10) according to the eighth aspect further includes a display unit (92) for displaying the determination result of the determination process by the determination unit (16) in any of the first to seventh aspects.

[0154] According to this aspect, the user can easily confirm the determination result of the determination process.

[0155] The power measurement system (10) according to the ninth aspect further includes an external communication unit (31) for transmitting the determination result of the determination process by the determination unit (16) to an external device (90) in any of the first to eighth aspects.

[0156] According to this aspect, the determination result of the determination process can be confirmed in the external device (90).

[0157] In the distribution board (100) according to the tenth aspect, it has the power measurement system (10) of any of the first to ninth aspects, and a cabinet (200) that houses at least the voltage processing unit (12A) and the current detector (8A) included in the power measurement system (10).

[0158] According to this aspect, a distribution board (100) capable of detecting incorrect installation of the power measurement system (10) can be provided.

[0159] Note that the second to ninth aspects are not essential configurations of the power measurement system (10) and can be omitted as appropriate.

Explanation of Reference Numerals

[0160] 10 Power measurement system 16 Determination Unit 31 External Communication Unit 51 Signal Reception Unit 90 External Device 91 Input Unit 92 Display Unit 100 Distribution Board 200 Cabinet 12A Voltage Processing Unit 12B Voltage Processing Unit 8A Current Detector 8B Current Detector PsA Power Supply PsB Power Supply TLA Trunk TLB Trunk

Claims

1. A voltage processing unit that measures an input voltage applied to a first main line, which is any one of a plurality of main lines supplied with power from each of a plurality of power sources, and transmits or receives a confirmation signal via the first main line; A current detector that detects an input current flowing through a branch circuit branched from a second main line, which is any one of the plurality of main lines, and transmits or receives the confirmation signal via the second main line; A determination unit that causes either the voltage processing unit or the current detector to transmit the confirmation signal, and determines whether the first main line and the second main line are the same main line based on whether the one that has not been caused to transmit the confirmation signal among the voltage processing unit and the current detector receives the confirmation signal. A power measurement system.

2. The confirmation signal is a voltage signal. The power measurement system according to Claim 1.

3. At least one of the voltage processing unit and the current detector has a signal receiving unit that receives the voltage signal. The power measurement system according to Claim 2.

4. The confirmation signal is a current signal. The power measurement system according to Claim 1.

5. The confirmation signal includes identification information for identifying the voltage processing unit or the current detector that is the transmission source. The power measurement system according to any one of Claims 1 to 4.

6. A plurality of the voltage processing units that measure the input voltage applied to each of a plurality of the first main lines, which are any one of the plurality of main lines; A plurality of the current detectors that detect an input current flowing through a plurality of branch circuits branched from each of a plurality of the second main lines, which are any one of the plurality of main lines, and In the determination process, the determination unit causes any one of each of the plurality of voltage processing units and each of the plurality of current detectors to transmit the confirmation signal in a time-division manner, and determines whether the one that has not been caused to transmit the confirmation signal among each of the plurality of voltage processing units and each of the plurality of current detectors receives the confirmation signal, thereby obtaining a combination of the first main line and the second main line that are the same main line among the plurality of first main lines and the plurality of second main lines. The power measurement system according to any one of Claims 1 to 5.

7. Further comprising an input unit that receives an input from a user, and The determination unit performs the determination process according to the input. The power measurement system according to any one of Claims 1 to 6.

8. Further having a display unit that displays a determination result of the determination process by the determination unit. The power measurement system according to any one of claims 1 to 7.

9. Further comprising an external communication unit that transmits the determination result of the determination process by the determination unit to an external device The power measurement system according to any one of claims 1 to 8.

10. The power measurement system according to any one of claims 1 to 9, and A cabinet that houses at least the voltage processing unit and the current detector included in the power measurement system. Distribution board.

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