Power measurement system, power measurement device, power measurement method and program

Abstract

To make it possible to detect incorrect installation.SOLUTION: A power measuring system 10 includes a voltage input terminal 11A, a voltage measurement unit 12A, a current input terminal 13A, a current measurement unit 14A, an operation unit 15A, and a determination unit 16A. The voltage input terminal 12A is connected to a power line C0A to a load. The voltage measurement unit 12A measures an input voltage input to the voltage input terminal 11A. To the current input terminal 13A, an input signal according to the current value of the input current flowing through the power line C0A is input. The current measurement unit 14A measures the input current based on the input signal input to the current input terminal 13A. The operation unit 15A calculates the power factor of the electric power supplied via the power line C0A based on the input voltage and the measurement result of the input current. The determination unit 16A performs an abnormality determination to determine whether there is an abnormality in the power factor. The determination unit 16A is configured to determine the power factor is abnormal when the power factor is not more than a preset power factor in the abnormality determination.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a power measurement system, a power measurement device, a power measurement method, and a program, and more particularly to a power measurement system, a power measurement device, a power measurement method, and a program that measure power consumed by a load. [Background technology]

[0002] The power measurement system described in Patent Document 1 includes a processing unit and a communication unit. The processing unit calculates the power of the circuit based on the detection result of a current sensor that detects the current flowing through the circuit in accordance with an operation program. The communication unit outputs information related to the detection result of the current sensor or receives input of information related to the detection result of the current sensor. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2020-106311 A Summary of the Invention [Problem to be solved by the invention]

[0004] In a power measurement system such as that described in Patent Document 1, if a current sensor is mistakenly installed in a circuit other than the circuit to be measured, the current flowing in the circuit to be measured cannot be measured correctly, so there has been a demand to detect the incorrect installation.

[0005] The present disclosure has been made in consideration of the above-mentioned reasons, and aims to provide a power measurement system, a power measurement device, a power measurement method, and a program capable of detecting erroneous construction. [Means for solving the problem]

[0006] A power measurement system according to an aspect of the present disclosure includes a voltage input terminal, a voltage measurement unit, a current input terminal, a current measurement unit, a calculation unit, and a judgment unit. The voltage input terminal is connected to a power supply path to a load. The voltage measurement unit measures an input voltage input to the voltage input terminal. An input signal corresponding to a current value of an input current flowing through the power supply path is input to the current input terminal. The current measurement unit measures the input current based on the input signal input to the current input terminal. The calculation unit calculates a power factor of power supplied through the power supply path based on measurement results of the input voltage and the input current. The judgment unit performs an abnormality judgment to judge whether or not there is an abnormality in the power factor. When the power factor becomes equal to or less than a set power factor in the abnormality judgment, the judgment unit judges that the power factor is abnormal. The calculation unit calculates the active power consumed by the load based on the measurement results of the input voltage and the input current. The determination unit, based on history information of the calculation results of the active power, does not perform the abnormality determination if there is history information in which the calculation result of the active power is a value equal to or greater than a set power value, and performs the abnormality determination if there is no history information in which the calculation result of the active power is a value equal to or greater than the set power value. A power measurement system according to an aspect of the present disclosure includes a voltage input terminal, a voltage measurement unit, a current input terminal, a current measurement unit, a calculation unit, and a judgment unit. The voltage input terminal is connected to a power supply path to a load. The voltage measurement unit measures an input voltage input to the voltage input terminal. An input signal corresponding to a current value of an input current flowing through the power supply path is input to the current input terminal. The current measurement unit measures the input current based on the input signal input to the current input terminal. The calculation unit calculates a power factor of power supplied through the power supply path based on the measurement results of the input voltage and the input current. The judgment unit performs an abnormality judgment to judge whether or not there is an abnormality in the power factor. When the power factor becomes equal to or less than a set power factor in the abnormality judgment, the judgment unit judges that the power factor is abnormal. The power supply path includes a plurality of circuits. The current input terminal includes a plurality of terminals respectively corresponding to the plurality of circuits. An input signal corresponding to a current value of an input current flowing through a corresponding circuit among the plurality of circuits is input to each of the plurality of terminals. The current measuring unit measures the input current flowing through a corresponding one of the plurality of circuits based on the input signal input to each of the plurality of terminals. The calculation unit calculates a power factor of the power supplied through each of the plurality of circuits. The power measurement system further includes a setting unit that individually sets whether or not the determination unit performs the abnormality determination for each of the plurality of circuits. A power measurement system according to an aspect of the present disclosure includes a voltage input terminal, a voltage measurement unit, a current input terminal, a current measurement unit, a calculation unit, and a judgment unit. The voltage input terminal is connected to a power supply path to a load. The voltage measurement unit measures an input voltage input to the voltage input terminal. An input signal corresponding to a current value of an input current flowing through the power supply path is input to the current input terminal. The current measurement unit measures the input current based on the input signal input to the current input terminal. The calculation unit calculates a power factor of power supplied through the power supply path based on the measurement results of the input voltage and the input current. The judgment unit performs an abnormality judgment to judge whether or not there is an abnormality in the power factor. In the abnormality judgment, when the power factor becomes equal to or less than a set power factor, the judgment unit judges that the power factor is abnormal. In the abnormality judgment, when the power factor becomes equal to or less than the set power factor for a set time or more, the judgment unit judges that the power factor is abnormal.

[0007] A power measuring device according to one aspect of the present disclosure is a power measuring device provided in the power measuring system, and includes the voltage input terminal, the voltage measuring unit, the current input terminal, the current measuring unit, the calculation unit, and the judgment unit.

[0008] A power measurement method according to an aspect of the present disclosure includes a voltage measurement process, a current measurement process, a calculation process, and a determination process. The voltage measurement process measures an input voltage input to a voltage input terminal connected to a power supply path to a load. The current measurement process measures an input current based on an input signal corresponding to a current value of an input current flowing through the power supply path input to a current input terminal. The calculation process finds a power factor of power supplied through the power supply path based on measurement results of the input voltage and the input current. The determination process performs an abnormality determination to determine whether or not there is an abnormality in the power factor. The determination process determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination. In the calculation process, the active power consumed by the load is calculated based on the measurement results of the input voltage and the input current. In the determination process, based on history information of the calculation results of the active power, if there is history information in which the calculation result of the active power is a value equal to or greater than a set power value, the abnormality determination is not performed, and if there is no history information in which the calculation result of the active power is a value equal to or greater than the set power value, the abnormality determination is performed. A power measurement method according to an aspect of the present disclosure includes a voltage measurement process, a current measurement process, a calculation process, and a judgment process. The voltage measurement process measures an input voltage input to a voltage input terminal connected to a power supply path to a load. The current measurement process measures the input current based on an input signal corresponding to a current value of the input current flowing through the power supply path input to a current input terminal. The calculation process obtains a power factor of power supplied through the power supply path based on the measurement results of the input voltage and the input current. The judgment process performs an abnormality judgment to judge whether or not there is an abnormality in the power factor. The judgment process judges that the power factor is abnormal when the power factor becomes equal to or less than a set power factor in the abnormality judgment. The power supply path includes a plurality of circuits. The current input terminal includes a plurality of terminals respectively corresponding to the plurality of circuits. An input signal corresponding to a current value of the input current flowing through a corresponding circuit among the plurality of circuits is input to each of the plurality of terminals. The current measurement process measures the input current flowing through a corresponding one of the plurality of circuits based on the input signal input to each of the plurality of terminals. The calculation process calculates a power factor of the power supplied through each of the plurality of circuits. The power measurement method further includes a setting process for individually setting whether or not to perform the abnormality determination for each of the plurality of circuits in the determination process. A power measurement method according to an aspect of the present disclosure includes a voltage measurement process, a current measurement process, a calculation process, and a determination process. The voltage measurement process measures an input voltage input to a voltage input terminal connected to a power supply path to a load. The current measurement process measures an input current based on an input signal corresponding to a current value of an input current flowing through the power supply path input to a current input terminal. The calculation process obtains a power factor of power supplied through the power supply path based on measurement results of the input voltage and the input current. The determination process performs an abnormality determination to determine whether or not there is an abnormality in the power factor. The determination process determines that the power factor is abnormal when the power factor becomes equal to or less than a set power factor in the abnormality determination. The determination process determines that the power factor is abnormal when the power factor becomes equal to or less than the set power factor for a set time or more in the abnormality determination.

[0009] A program according to one aspect of the present disclosure is a program for causing a computer system to execute the power measurement method. Effect of the Invention

[0010] The present disclosure has the advantage that improper installation can be detected. [Brief description of the drawings]

[0011] [Figure 1] FIG. 1 is a block diagram of a power measurement system according to an embodiment. [Diagram 2] FIG. 2 is a block diagram of the power measurement system. [Diagram 3] FIG. 3 is a graph of the input voltage and input current in the above-mentioned power measurement system. [Figure 4] FIG. 4 is a block diagram of the above power measurement system in an incorrect installation state. [Diagram 5] FIG. 5 is a flowchart showing an operation of determining an abnormality in a power factor of the power measuring system according to the embodiment of the present invention. [Figure 6] FIG. 6 is a flowchart showing an operation of determining an abnormality in a power factor of the power measuring system according to the above embodiment. [Figure 7] FIG. 7 is a graph of the input voltage and input current in the above power measurement system. [Figure 8] FIG. 8 is a graph of the power factor in the above-mentioned power measurement system. [Figure 9] FIG. 9 is a graph of the input voltage and input current in the power measurement system of the second modification. [Figure 10] FIG. 10 is a block diagram of a power measurement system according to the third modification. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0012] A 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 embodiment and modified examples described below are merely examples of the present disclosure, and the present disclosure is not limited to the embodiment and modified examples. Other than the embodiment and modified examples, various modifications are possible according to the design, etc., as long as they do not deviate from the technical idea of ​​the present disclosure. In addition, the following embodiments (including modified examples) may be realized in appropriate combination.

[0013] (1) Overview First, an overview of a power measurement system 10 according to this embodiment will be described.

[0014] The power measurement system 10 is used by being disposed in a cabinet of a distribution board in a consumer facility such as a factory or an office, etc. The power measurement system 10 may also be applied to residential facilities such as an apartment building.

[0015] As shown in FIG. 1 and FIG. 2, the power measurement system 10 includes a voltage input terminal 11A, a voltage measurement unit 12A, a current input terminal 13A, a current measurement unit 14A, a calculation unit 15A, and a judgment unit 16A. The voltage input terminal 11A is connected to a power supply line C0A that supplies power to a load. In this embodiment, the power supplied to the load through the power supply line C0A is AC power. The voltage measurement unit 12A measures an input voltage V0A input to the voltage input terminal 11A. The input voltage V0A is an AC voltage applied to the power supply line C0A. An input signal corresponding to a current value of an input current I0A, which is an AC current flowing through the power supply line C0A, is input to the current input terminal 13A. The current measurement unit 14A measures the input current I0A based on the input signal input to the current input terminal 13A. The calculation unit 15A calculates the power factor F0A of the power supplied through the power supply path C0A based on the measurement results of the input voltage V0A and the input current I0A. The judgment unit 16A performs an abnormality judgment to judge whether or not there is an abnormality in the power factor F0A. In the abnormality judgment, the judgment unit 16A judges that the power factor F0A is abnormal when the power factor F0A is equal to or lower than a set power factor Fs0. Note that the "set power factor Fs0" referred to here is a power factor value that is a criterion for the judgment of an abnormality in the power factor F0A by the judgment unit 16A.

[0016] Here, when the wiring to the voltage input terminal 11A and the wiring to the current input terminal 13A are correctly installed, if the load operation is normal, it is assumed that the power factor F0A calculated by the calculation unit 15A varies within a predetermined normal fluctuation range. In the power measurement system 10, the set power factor Fs0 is set to a value lower than the lower limit of the normal fluctuation range, and the judgment unit 16A judges the presence or absence of an abnormality by comparing the power factor F0A calculated by the calculation unit 15A with the set power factor Fs0. If the power factor calculated by the calculation unit 15A is judged to be abnormal, it can be assumed that an incorrect installation such as incorrect wiring to the voltage input terminal 11A and incorrect wiring to the current input terminal 13A has occurred, and therefore the power measurement system 10 can detect the incorrect installation from the judgment result of the abnormality judgment of the power factor F0A.

[0017] (2) Details (2.1) Structure The configuration of a power measurement system 10 according to this embodiment will be described below with reference to FIGS.

[0018] As shown in Fig. 1, the power measurement system 10 of this embodiment includes a basic unit 1A that is a power measurement device. The basic unit 1A can measure the power supplied from a single-phase three-wire distribution board 3A through a power feed line C0A, for example. The basic unit 1A may also measure the power supplied from a three-phase three-wire distribution board.

[0019] Here, the power supply line C0A has a main circuit C1A and branch circuits C2A to C5A that are branched in parallel from the main circuit C1A by, for example, four branch breakers 4A. The main circuit C1A includes a main breaker 5A and an electric path from the power system PsA to the main breaker 5A. Each of the branch circuits C2A to C5A is a circuit to which a load is connected, and includes a branch breaker 4A and an electric path from the main breaker 5A to the branch breaker 4A. In this embodiment, as an example, it is assumed that three loads (loads 22A to 24A) are connected to the branch circuits C2A to C4A, respectively.

[0020] The basic unit 1A, which is a power measuring device, has a voltage input terminal 11A, a current input terminal 13A, and a processing unit 6A. The processing unit 6A includes a voltage measurement unit 12A, a current measurement unit 14A, a calculation unit 15A, and a judgment unit 16A. The processing unit 6A further includes a storage unit 31A.

[0021] 1, the voltage input terminal 11A is electrically connected to, for example, a main circuit C1A of a distribution board 3A. That is, an input voltage V0A applied to the main circuit C1A from a power system PsA is input to the voltage input terminal 11A. Here, the input voltage V0A applied to the main circuit C1A is applied in parallel to each of the branch circuits C2A to C5A via each branch breaker 4A.

[0022] The current input terminal 13A includes, for example, four terminals (terminals 71A to 74A). A current sensor can be connected to each of the terminals 71A to 74A. Here, the current sensor is, for example, a current transformer (CT). The current sensors are attached to the main circuit C1A and the branch circuits C2A to C5A, and input an input signal corresponding to the current value of the input current I0A flowing through the main circuit C1A and the branch circuits C2A to C5A to the terminals 71A to 74A, respectively. In this embodiment, for example, four current sensors (current sensors 81A to 84A) are attached to the main circuit C1A and the branch circuits C2A to C4A, respectively. The current sensors 81A to 84A are connected to the terminals 71A to 74A, respectively. That is, the current sensor 81A inputs an input signal Sig1A corresponding to the current value of the input current I0A (input current I1A) flowing through the main circuit C1A to the terminal 71A. The current sensors 82A-84A input input signals Sig2A-Sig4A corresponding to the input currents I0A (input currents I2A-I4A) flowing through the branch circuits C2A-C4A, respectively, to the terminals 72A-74A. The current sensors 81A-84A are attached in a non-contact state to the main circuit C1A and the branch circuits C2A-C4A, respectively.

[0023] The processing unit 6A can be realized by, for example, a computer system including one or more processors (microprocessors) and one or more memories. That is, the one or more processors execute one or more programs (applications) stored in one or more memories to function as the processing unit 6A. Here, the programs are pre-recorded in the memory of the processing unit 6A, but they may be provided via a telecommunications line such as the Internet or by being recorded on a non-transitory recording medium such as a memory card.

[0024] Voltage measurement unit 12A measures input voltage V0A input to voltage input terminal 11 A. The measurement result of input voltage V0A by voltage measurement unit 12A is stored in storage unit 31A.

[0025] The current measurement unit 14A measures the input currents I1A-I4A flowing through the main circuit C1A and the branch circuits C2A-C4A corresponding to the terminals 71A-74A, respectively, based on the input signals Sig1A-Sig4A input to the terminals 71A-74A from the current sensors 81A-84A, respectively. The measurement results of the input currents I1A-I4A by the current measurement unit 14A are stored in the memory unit 31A.

[0026] The calculation unit 15A calculates the power factor F0A (power factor F1A) of the power supplied through the main circuit C1A based on the measurement result of the input voltage V0A by the voltage measurement unit 12A and the measurement result of the input current I1A by the current measurement unit 14A. The calculation unit 15A also calculates the power factors F0A (power factors F2A to F4A) of the power supplied to the loads 22A to 24A through the branch circuits C2A to C4A based on the measurement result of the input voltage V0A and the measurement results of the input currents I2A to I4A.

[0027] Specifically, the calculation unit 15A calculates the active power Pe1A supplied through the main circuit C1A and the active powers Pe2A to Pe4A consumed by the loads 22A to 24A, respectively, based on the measurement results of the input voltage V0A and the input currents I1A to I4A. The calculation unit 15A also calculates the apparent power Pa1A supplied through the main circuit C1A and the apparent powers Pa2A to Pa4A supplied to the loads 22A to 24A, respectively, based on the effective value of the input voltage V0A and the effective values ​​of the input currents I1A to I4A. The calculation unit 15A calculates the power factors F1A to F4A, which are values ​​obtained by dividing the active powers Pe1A to Pe4A by the apparent powers Pa1A to Pa4A, respectively, based on the calculation results of the active powers Pe1A to Pe4A and the calculation results of the apparent powers Pa1A to Pa4A. The effective powers Pe1A to Pe4A, apparent powers Pa1A to Pa4A and power factors F1A to F4A calculated by the calculation unit 15A are stored in the storage unit 31A.

[0028] The determination unit 16A performs an abnormality determination to determine whether or not each of the power factors F1A to F4A calculated by the calculation unit 15A is abnormal. When each of the input currents I1A to I4A is equal to or greater than a set current value Is0A, the determination unit 16A performs an abnormality determination for the power factors F1A to F4A. Here, the abnormality determination is a process of determining that the power factors F1A to F4A are abnormal when each of the power factors F1A to F4A is equal to or less than a set power factor Fs0. In detail, the determination unit 16A performs an abnormality determination for each of the power factors F1A to F4B of the power supplied through each of the main circuit C1A and the branch circuits C2A to C4A, for example, when the input currents I1A to I4A flowing through the main circuit C1A and the branch circuits C2A to C4A, respectively, are equal to or greater than a set current value Is0A. The set current value Is0A is set individually corresponding to the input currents I1A to I4A flowing through the main circuit C1A and the branch circuits C2A to C4A. For example, in this embodiment, a plurality of set current values ​​Is0A (set current values ​​Is1A to Is4A) corresponding to the input currents I1A to I4A are set. This configuration has the following advantages, for example. When a load in a non-operating state (standby state) exists among the loads 22A to 24A, the power factor F0A of the power supplied to the non-operating load through the corresponding branch circuit may become smaller than the power factor F0A of the power supplied to the operating load. In this case, if the input current I0A flowing through the branch circuit corresponding to the non-operating load is less than the set current value Is0A, the determination unit 16A does not perform an abnormality determination on the power factor F0A of the power supplied to the non-operating load. This makes it possible to prevent the power factor F0A, which is equal to or less than the set power factor Fs0 due to a cause other than incorrect installation, from being determined to be abnormal by the determination unit 16A. Furthermore, the set current values ​​Is1A to Is4A are set individually corresponding to the input currents I1A to I4A, so that the conditions for whether or not to perform abnormality determination can be set for each of the main circuit C1A and the branch circuits C2A to C4A. Note that the set current values ​​Is1A to Is4A may each be set to a current value calculated by multiplying the rated current value of the main breaker 5A connected to the main circuit C1A and the branch breakers 4A connected to the branch circuits C2A to C4A by a common ratio Rc.In this case, if one common ratio Rc is set, the set current values ​​Is1A to Is4A are automatically calculated and set. For example, as shown in Table 1 below, if the rated current values ​​of the main breaker 5A connected to the main circuit C1A and the branch breaker 4A connected to the branch circuits C2A to C4A are 400A, 250A, 100A, and 50A, respectively, and the common ratio Rc is 20%, the set current values ​​Is1A to Is4A are 80A, 50A, 20A, and 10A, respectively.

[0029] [Table 1]

[0030] 2, the processing unit 6A of the power measurement system 10 further includes a setting unit 30A. The setting unit 30A individually sets whether or not the determination unit 16A will perform an abnormality determination for each of the main circuit C1A and the branch circuits C2A to C4A. The processing unit 6A further includes a storage unit 31A, and the setting result of whether or not the determination of abnormality of the power factors F1A to F4A is performed by the setting unit 30A is stored in the storage unit 31A.

[0031] With this configuration, it is possible to prevent the judgment unit 16A from performing an abnormality judgment on the power factor F0A of the power supplied to, for example, a load on which reactive power control is being performed among the loads 22A to 24A. Here, since an input voltage V0A and an input current I0A with a phase difference Δθ1 of 90° are supplied to the load on which reactive power control is being performed, the power factor F0A defined by cosΔθ1 is 0. Note that, as shown in FIG. 3, when a phase difference Δθ1 of 90° occurs between the input voltage V0A and the input current I0A in a period T1 due to reactive power control, the input current I0A lags behind the input voltage V0A by T1 / 4. Here, by not causing the judgment unit 16A to perform an abnormality judgment on the power factor F0A corresponding to the load on which reactive power control is being performed, it is possible to prevent the power factor F0A, whose value is 0 due to reactive power control, from being judged to be abnormal.

[0032] Note that the voltage measurement unit 12A, current measurement unit 14A, calculation unit 15A, judgment unit 16A, setting unit 30A and memory unit 31A possessed by the processing unit 6A do not represent physical configurations, but rather represent functions realized by the processing unit 6A.

[0033] 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 a socket 17 provided in the basic unit 1A. The basic unit 1A and the display setting unit 9 communicate with each other via wired communication. Note that the basic unit 1A and the display setting unit 9 may also communicate with each other via wireless communication using radio waves as a medium, such as Bluetooth (registered trademark).

[0034] The display setting unit 9 includes a display section 91 and an operation section 92 .

[0035] The display unit 91 is, for example, a display such as a liquid crystal display or an organic EL (Electroluminescence) display. The display unit 91 displays information. The information displayed by the display unit 91 is, for example, information on the active powers Pe1A to Pe4A, the apparent powers Pa1A to Pa4A, and the power factors F1A to F4A calculated by the calculation unit 15A. Furthermore, when it is determined that at least one of the power factors F1A to F4A is abnormal in the abnormality determination of the power factors F1A to F4A, the display unit 91 displays an error message.

[0036] The operation unit 92 includes, for example, a plurality of buttons and receives operation inputs from a user of the power measurement system 10.

[0037] 1 and 2, the power measurement system 10 also includes a heterogeneous system unit 1B connected to the basic unit 1A. The heterogeneous system unit 1B has a connection section 18, and an expansion connection section 19 included in the basic unit 1A is connected to the connection section 18. The basic unit 1A and the heterogeneous system unit 1B communicate with each other, for example, by wired communication. Note that the basic unit 1A and the heterogeneous system unit 1B may also communicate with each other, for example, by wireless communication using radio waves as a medium, such as Bluetooth (registered trademark).

[0038] The heterogeneous system unit 1B is a power measuring device and can measure, for example, the power supplied from a three-phase three-wire distribution board 3B through a power feed line C0B. The heterogeneous system unit 1B may also measure the power supplied from a single-phase three-wire distribution board.

[0039] Here, the power supply line C0B has a main circuit C1B and branch circuits C2B to C5B that are branched in parallel from the main circuit C1B by, for example, four branch breakers 4B. The main circuit C1B includes a main breaker 5B and an electric path from the power system PsB to the main breaker 5B. Each of the branch circuits C2B to C5B is a circuit to which a load is connected, and includes a branch breaker 4B and an electric path from the main breaker 5B to the branch breaker 4B. In this embodiment, as an example, it is assumed that one load (load 22B) is connected to the branch circuit C2B.

[0040] The heterogeneous system unit 1B has a voltage input terminal 11B, a current input terminal 13B, and a processing unit 6B. The processing unit 6B has a voltage measurement unit 12B, a current measurement unit 14B, a calculation unit 15B, a judgment unit 16B, a setting unit 30B, and a storage unit 31B. Here, the voltage input terminal 11B, the current input terminal 13B, the voltage measurement unit 12B, the current measurement unit 14B, the calculation unit 15B, the judgment unit 16B, and the setting unit 30B of the heterogeneous system unit 1B have functions in common with the voltage input terminal 11A, the current input terminal 13A, the voltage measurement unit 12A, the current measurement unit 14A, the calculation unit 15A, the judgment unit 16A, and the setting unit 30A of the basic unit 1A. Therefore, in the following description of each part of the heterogeneous system unit 1B, the description of the functions in common with each part of the basic unit 1A will be appropriately simplified.

[0041] 1, the voltage input terminal 11B is electrically connected to, for example, a main circuit C1B of a distribution board 3B. An input voltage V0B applied to the main circuit C1B is applied to each of the branch circuits C2B to C5B via each branch breaker 4B.

[0042] The current input terminal 13B includes, for example, four terminals 71B to 74B. A current sensor can be connected to each of the terminals 71B to 74B. In this embodiment, for example, two current sensors (current sensors 81B and 82B) are attached to the main circuits C1B and C2B. The current sensors 81B and 82B are connected to the terminals 71B and 72B, respectively.

[0043] Voltage measurement unit 12B measures input voltage V0B input to voltage input terminal 11B. The measurement result of input voltage V0B by voltage measurement unit 12B is stored in storage unit 31B.

[0044] The current measurement unit 14B measures the input currents I0B (input currents I1B and I2B) flowing through the main circuit C1B and the branch circuit C2B, respectively, based on the input signals Sig1B and Sig2B input from the current sensors 81B and 82B to the terminals 71B and 72B, respectively. The measurement results of the input currents I1B and I2B by the current measurement unit 14B are stored in the memory unit 31B.

[0045] The calculation unit 15B calculates the active power Pe1B, apparent power Pa1B, and power factor F1B of the power supplied through the main circuit C1B based on the measurement results of the input voltage V0B by the voltage measurement unit 12B and the measurement results of the input current I1B by the current measurement unit 14B. The calculation unit 15B also calculates the active power Pe2B, apparent power Pa2B, and power factor F2B of the power supplied to the load 22B through the branch circuit C2B based on the measurement results of the input voltage V0B and the input current I2B. The active powers Pe1B-Pe2B, apparent powers Pa1B-Pa2B, and power factors F1B-F2B calculated by the calculation unit 15B are stored in the memory unit 31B.

[0046] Information on the active powers Pe1B to Pe2B, the apparent powers Pa1B to Pa2B, and the power factors F1B to F2B is displayed on the display section 91 of the display setting unit 9 connected to the basic unit 1A.

[0047] The determination unit 16B performs an abnormality determination for the power factors F1B to F2B calculated by the calculation unit 15B. When the determination unit 16B determines that at least one of the power factors F1B and F2B is abnormal, an error message is displayed on the display unit 91 of the display setting unit 9.

[0048] (2.2) Example 1 of power factor abnormality detection An operation example 1 of determining an abnormality in a power factor in the power measurement system 10 of this embodiment will be described with reference to FIGS. 1-2, FIG. 4, and the flowchart of FIG. 5, and FIGS.

[0049] In the following, a case will be described in which the current sensor 82B, which should be connected to the terminal 72B of the heterogeneous system unit 1B as shown in Fig. 1, is connected to the terminal 72A of the basic unit 1A as shown in Fig. 4 due to erroneous installation. In this case, it is assumed that the current sensor 82A, which should be connected to the terminal 72A of the basic unit 1A, is connected to the terminal 72B of the heterogeneous system unit 1B. Here, the operation of the basic unit 1A will be described, and the operation of the heterogeneous system unit 1B will not be described.

[0050] First, the basic unit 1A measures the input voltage and input current as electrical characteristics (ST1).

[0051] In detail, the voltage measurement unit 12A measures the input voltage V0A, and the current measurement unit 14A measures the input current I1A flowing through the main circuit C1A, the input current I2B flowing through the branch circuit C2B, the input current I3A flowing through the branch circuit C3A, and the input current I4A flowing through the branch circuit C4A based on the signals Sig1A to Sig4A input to the input terminals 71A to 74A. Here, due to an incorrect installation of the power measurement system 10, the input current I2B flowing through the branch circuit C2B is measured instead of the input power I2A flowing through the branch circuit C2A that should be measured by the current measurement unit 14A.

[0052] The calculation unit 15A calculates active power Pe1A, active power Pe3A, active power Pe4A, apparent power Pa1A, apparent power Pa3A, and apparent power Pa4A based on the measurement results of the input voltage V0A, the input current I1A, the input current I3A, and the input current I4A. The calculation unit 15A also calculates active power Pe2D and apparent power Pa2D from the input voltage V0A and the input current I2B.

[0053] Next, the calculation unit 15A calculates power factors F1A, F3A and F4A from the active powers Pe1A, Pe3A, Pe4A, apparent powers Pa1A, Pa3A and Pa4A. The calculation unit 15A also calculates power factor F2D from the active powers Pe2D and apparent powers Pa2D.

[0054] Next, the judgment unit 16A judges the power factors F1A, F2D, F3A, and F4A for abnormality. Below, the abnormality judgment for the power factor F2D calculated from the input voltage V0A and the input current I2B corresponding to different distribution boards due to incorrect installation will be described. Note that the flow of abnormality judgment is the same for the power factors F1A, F3A, and F4A.

[0055] The determination unit 16A performs an abnormality determination for the power factor F2D when the following two conditions are satisfied.

[0056] The first condition is that the power factor F2A of the power supplied to the load 22A, which is the measurement target of the basic unit 1A, is set as the target for performing the abnormality determination by the setting unit 30A. Specifically, the first condition is that the load 22A of the branch circuit C2A corresponding to the terminal 72A is not the target of the reactive power control, for example (ST2: No).

[0057] The second condition is that the input current I2B is equal to or greater than a set current value Is2A that is set corresponding to the input current I2A (ST3: Yes).

[0058] The determination unit 16A performs an abnormality determination for the power factor F2D when the power factor F2D and the input current I2B satisfy a first condition and a second condition.

[0059] When the power factor F2D is equal to or lower than the set power factor Fs0 for the set time T2 or longer (ST4: Yes), the determination unit 16A determines that the power factor F2D is abnormal (ST5).

[0060] Here, the power factor F2D is the cosine (cosΔθ2) of the phase difference Δθ2 between the input voltage V0A and the input current I2B. The input voltage V0A is the voltage applied to the load 22A connected to the distribution board 3A. On the other hand, the input current I2B is the current to be detected by the current sensor 82B connected to the terminal 72A due to incorrect installation, and is the current supplied to the load 22B connected to the distribution board 3B. Therefore, the phase difference Δθ2 may be larger than the phase difference Δθ3 between the input voltage V0A and the input current I2A corresponding to the terminal 72A when the power measurement system 10 is correctly installed. For example, as shown in FIG. 7, when Δθ3 is 10°, the input current I2A lags behind the input voltage V0A by Δθ3 / 360°·T1=T1 / 36 (T1 is the period of the input current V0A and the input current I2A). On the other hand, when Δθ2 is 60°, the input current I2B lags the input voltage V0A by Δθ2 / 360°·T1=T1 / 6. In other words, the power factor F2D may be smaller than the power factor F2A, which is the cosine of the phase difference Δθ3 (cosΔθ3).

[0061] When the determination unit 16A determines that the power factor F2D is abnormal, the display unit 91 provided in the display setting unit 9 displays an error display (ST6). The error display includes, for example, text. The error display may also include an illustration. This allows the user of the power measurement system 10 to recognize the possibility that the power measurement system 10 is improperly installed (miswiring). Furthermore, when the determination unit 16A determines that the power factor F2D is abnormal, the display setting unit 9 may output a sound from a speaker or the like notifying the user of the power measurement system 10 of the error state, and the user of the power measurement system 10 can recognize the possibility that the power measurement system 10 is improperly installed (miswiring) by the sound.

[0062] In this embodiment, when the operation unit 92 receives an operation input from the user of the power measurement system 10 to stop the error display while the display unit 91 is displaying an error display (ST7: Yes), the display unit 91 stops the error display (ST8). This makes it possible to stop the error display after, for example, reconnecting the wiring in the power measurement system 10 correctly.

[0063] (2.3) Example 2 of power factor abnormality detection An operation example 2 of determining an abnormality in the power factor in the power measurement system 10 of this embodiment will be described with reference to Figs. 1 and 2 and the flowcharts of Figs. 5, 6, and 8. Here, the operation of the basic unit 1A will be described, and the operation of the heterogeneous system unit 1B will be omitted. In addition, in the operation example 2, the explanation of the parts common to the operation example 1 will be appropriately simplified.

[0064] In the second operational example, it is assumed that the power measurement system 10 is properly wired as shown in FIG.

[0065] First, the basic unit 1A measures the electrical characteristics, that is, the input voltage V0A, the input currents I1A to I4A, and the power factors F1A to F4A (ST1).

[0066] Next, the determination unit 16A performs abnormality determination for the power factors F1A to F4A. In the following, the abnormality determination for the power factor F2A will be described as an example.

[0067] When the power factor F2A is not subject to reactive power control (ST2: No) and the input current I2A is equal to or greater than the set current value Is2A (ST3: Yes), the determination unit 16A performs an abnormality determination for the power factor F2A.

[0068] When the power factor F2A is equal to or lower than the set power factor Fs0 for the set time T2 or more (ST4: Yes), the judgment unit 16A judges that the power factor F2A is abnormal (ST5). As a result, as shown in Fig. 8, when the power factor F2A is temporarily equal to or lower than the set power factor Fs0 due to a cause other than incorrect installation and the power factor F2A returns to a value higher than the set power factor Fs0 in a time shorter than the set time T2, the power factor F2A is not judged to be abnormal.

[0069] When the determination unit 16A determines that the power factor F2A is abnormal, the display unit 91 displays an error message (ST6).

[0070] At this time, if the user of the power measurement system 10 determines that the value of the power factor F2A is within the operationally acceptable range, the user can operate the operation unit 92 (ST7: Yes) while the display unit 91 is displaying the error message to stop the error message from being displayed on the display unit 91 (ST8).

[0071] Next, the determination of an abnormality in the power factor F2A after the error display has stopped will be described with reference to FIG.

[0072] The basic unit 1A measures the electrical characteristics (ST21).

[0073] Here, when the input power V0A, input current I2A, and power factor F2A, which are the power characteristics, are the same as when the previous error display was displayed (ST22: Yes), the judgment unit 16A does not judge the power factor F2A to be abnormal. This prevents the error display from being displayed on the display unit 91 again when the power factor F2A becomes a value that the user of the power measurement system 10 allowed at the time of the previous error when the input power V0A value and the input current I2A value are the same as when the power factor was determined to be abnormal last time. Note that, for example, even if the value of the power factor F2A is the same as that at the time of the previous error, if at least one of the input power V0A value and the input current I2A value is different from that at the time of the previous error (ST22: No), it is preferable to perform the processing from ST23 onwards, since there is a possibility that the power factor F2A has become equal to or lower than the set power factor Fs0 due to a cause different from that at the time of the previous error. Here, ST23 to ST29 are the same as ST2 to ST8, and therefore a description thereof will be omitted.

[0074] If the determining section 16A determines that the power factor F2A is not abnormal, the basic unit 1A continues to measure the electrical characteristics of the circuit to be measured (branch circuit C2A).

[0075] (3) Modifications Below, modifications of the above embodiment will be described. However, components common to the above embodiment will be given the same reference numerals and their description will be omitted as appropriate. In addition, each configuration of the modifications described below can be applied in appropriate combination with each configuration described in the above embodiment.

[0076] (3.1) Variation 1 In this modification 1, the judgment unit 16A differs from the above-described embodiment in that it determines whether or not to perform an abnormality judgment of the power factors F1A to F4A based on history information of the calculation results of the active powers Pe1A to Pe4A stored in the memory unit 31A.

[0077] Specifically, when there is history information showing a value equal to or greater than the set power value in the calculation results of each of the active powers Pe1A to Pe4A, an abnormality determination is not performed for the power factor corresponding to the active power among the active powers Pe1A to Pe4A that is equal to or greater than the set power value. Also, when there is no history information showing a value equal to or greater than the set power value in the calculation results of each of the active powers Pe1A to Pe4A, an abnormality determination is performed for the power factor corresponding to the active power that is not equal to or greater than the set power value among the active powers Pe1A to Pe4A. The set power value is set to, for example, the minimum value of the active power required for normal operation of the loads 22A to 24A.

[0078] With this configuration, the power factor corresponding to the load with the history of being supplied with active power equal to or greater than the set power value is considered to have been measured in a normal installation state. In other words, the judgment unit 16A does not perform an abnormality judgment for the power factor corresponding to the load with the history of being supplied with active power equal to or greater than the set power value, since no power factor abnormality occurs due to incorrect installation. On the other hand, the power factor corresponding to the load with no history of being supplied with active power equal to or greater than the set power value is considered to be possibly not measured normally due to incorrect installation, and the judgment unit 16A performs an abnormality judgment for the power factor corresponding to the load with no history of being supplied with active power equal to or greater than the set power value. Here, the state with no history of being supplied with active power equal to or greater than the set power value is, for example, the initial installation of the power measurement system 10, so this configuration has the advantage of being able to detect incorrect installation at the initial installation.

[0079] The determination unit 16B included in the heterogeneous system unit 1B may have a similar function.

[0080] (3.2) Variation 2 In the present modified example 2, the error display displayed by the display unit 91 includes content indicating the cause of the abnormality of the power factor F0A, which is different from the above embodiment and modified example 1. Here, the cause of the abnormality of the power factor F0A is estimated by the judgment unit 16A. More specifically, when the judgment unit 16A judges that the power factor F4A is abnormal, for example, in the abnormality judgment of the power factor F0A, it estimates the cause of the abnormality of the power factor F4A based on the phase difference Δθ4 between the phase of the input voltage V0A and the phase of the input current I4A, which is defined in the range of 0° to 180°.

[0081] For example, when Δθ4=90°, the determining unit 16A determines that the cause of the abnormality in the power factor F4A is that reactive power control is being performed on the load 24A to which the input current I4A is supplied.

[0082] When Δθ4=180°, the judgment unit 16A judges that at least one of the input voltage V0A and the input current I4A is measured with the wrong polarity. In this case, as shown in FIG 9, the input current I4A lags behind the input voltage V0A by T1 / 2.

[0083] If 0°<Δθ4<90° or 90°<Δθ4<180°, the determination unit 16A determines that the cause of the abnormality in the power factor F4A is incorrect installation (miswiring).

[0084] The determination unit 16B included in the heterogeneous system unit 1B may have a similar function.

[0085] (3.3) Variation 3 In the present modified example 3, the power measurement system 10 differs from the above-described embodiment, modified example 1, and modified example 2 in that an add-on unit 1C is provided as shown in FIG.

[0086] The extension unit 1C is a current measuring device, and measures the current flowing through the power supply line C0A of the distribution board 3A.

[0087] The extension unit 1C includes a current input terminal 13C, a current measuring section 14C, a connection section 40, and a connection section 41.

[0088] The connection part 40 is connected to the extension connection part 19 of the basic unit 1A. The connection part 41 is connected to the connection part 18 of the heterogeneous system unit 1B.

[0089] The current input terminal 13C includes, for example, four terminals (terminals 71C to 74C). A current sensor can be connected to each of the terminals 71C to 74C. In the present modified example 3, as shown in FIG. 10, for example, five current sensors (current sensors 81A to 85A) are attached to the main circuit C1A and the branch circuits C2A to C5A, respectively. The loads 22A to 25A are connected to the branch circuits C2A to C5A, respectively. Here, the current sensors 81A to 84A are connected to the terminals 71A to 74A of the basic unit 1A, respectively. The current sensor 85A is connected to the terminal 71C of the current input terminal 13C of the extension unit 1C.

[0090] The current measurement unit 14C measures the input current I5A flowing through the main circuit C5A based on the input signal Sig5A input from the current sensor 85A to the terminal 71C. The measurement result of the input current I5A by the current measurement unit 14C is stored in the memory unit 31A.

[0091] The calculation unit 15A calculates the power factor F5A of the power supplied to the load 25A through the branch circuit C5A, based on the measurement results of the input voltage V0A and the measurement results of the input current I5A.

[0092] In the present modified example 3, by providing the extension unit 1C, the basic unit 1A can increase the number of circuits capable of measuring power.

[0093] (3.4) Other Modifications Other variations of the embodiment will be listed below. The following variations may be implemented in appropriate combination.

[0094] The same functions as those of the power measurement system 10 may be embodied in a power measurement method, a computer program, or a non-transitory recording medium on which a program is recorded.

[0095] The transportation control method according to the embodiment includes a voltage measurement process, a current measurement process, a calculation process, and a judgment process. The voltage measurement process measures an input voltage V0A input to a voltage input terminal 11A connected to a power supply line C0A to a load. The current measurement process measures an input current I0A based on an input signal corresponding to a current value of the input current I0A flowing through the power supply line C0A input to a current input terminal 13A. The calculation process obtains a power factor of the power supplied through the power supply line C0A based on the measurement results of the input voltage V0A and the input current I0A. The judgment process performs an abnormality judgment to judge whether or not there is an abnormality in the power factor. The judgment process judges that the power factor is abnormal when the power factor becomes equal to or less than a set power factor Fs0 in the abnormality judgment. Moreover, the (computer) program according to the embodiment is a program for causing a computer system to execute the above-mentioned power measurement method.

[0096] The power measurement system 10 in the present disclosure includes a computer system. The computer system is mainly composed of a processor and a memory as hardware. The processor executes a program recorded in the memory of the computer system to realize the function of the power measurement system 10 in the present disclosure. The program may be pre-recorded in the memory of the computer system, provided through an electric communication line, or provided by recording it in a non-transitory recording medium such as a memory card, an optical disk, or a hard disk drive that can be read by the computer system. The processor of the computer system is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or a large-scale integrated circuit (LSI). The integrated circuits such as IC or LSI referred to here are called by different names depending on the degree of integration, and include integrated circuits called system LSI, VLSI (Very Large Scale Integration), or ULSI (Ultra Large Scale Integration). Furthermore, a field-programmable gate array (FPGA) that is programmed after the manufacture of the LSI, or a logic device that can reconfigure the connection relationship inside the LSI or the circuit partition inside the LSI, can also be adopted as a processor. The electronic circuits may be integrated in one chip or distributed among multiple chips. The chips may be integrated in one device or distributed among multiple devices. The computer system referred to here includes a microcontroller having one or more processors and one or more memories. Thus, the microcontroller is also composed of one or more electronic circuits including a semiconductor integrated circuit or a large-scale integrated circuit.

[0097] In the above embodiment, the display unit 91 is provided in the display setting unit 9 of the basic unit 1A. However, the basic unit 1A and the heterogeneous system unit 1B may each have a display unit 91.

[0098] (4) Summary As described above, the power measurement system (10) according to the first aspect includes a voltage input terminal (11A), a voltage measurement unit (12A), a current input terminal (13A), a current measurement unit (14A), a calculation unit (15A), and a determination unit (16A). The voltage input terminal (11A) is connected to a power supply path (C0A) to a load. The voltage measurement unit (12A) measures an input voltage (V0A) input to the voltage input terminal (11A). An input signal corresponding to a current value of an input current (I0A) flowing through the power supply path (C0A) is input to the current input terminal (13A). The current measurement unit (14A) measures the input current (I0A) based on the input signal input to the current input terminal (13A). The calculation unit (15A) calculates the power factor (F0A) of the power supplied through the power supply line (C0A) based on the measurement results of the input voltage (V0A) and the input current (I0A). The judgment unit (16A) performs an abnormality judgment to judge whether or not there is an abnormality in the power factor (F0A). When the power factor (F0A) becomes equal to or lower than a set power factor (Fs0) in the abnormality judgment, the judgment unit (16A) judges that the power factor (F0A) is abnormal.

[0099] According to this embodiment, improper installation of the power measurement system (10) can be detected from the power factor (F0A) of the power.

[0100] In the power measurement system (10) according to the second aspect, in the first aspect, the calculation unit (15A) determines the active power consumed by the load based on the measurement results of the input voltage (V0A) and the input current (I0A).

[0101] According to this aspect, it is possible to measure the active power consumed by the load.

[0102] In the power measurement system (10) according to the third aspect, in the second aspect, the determination unit (16A) does not perform an abnormality determination based on the history information of the calculation result of the active power when there is history information in which the calculation result of the active power is a value equal to or greater than the set power value. The determination unit (16A) performs an abnormality determination based on the history information of the calculation result of the active power when there is no history information in which the calculation result of the active power is a value equal to or greater than the set power value.

[0103] According to this aspect, it is possible to detect erroneous installation of the power measurement system (10) at the initial installation stage when there is no history information showing that the calculation result of the active power is equal to or greater than the set power value.

[0104] In the power measurement system (10) according to a fourth aspect, in any one of the first to third aspects, the determination section (16A) performs an abnormality determination when the input current (I0A) is equal to or greater than a set current value (Is0A).

[0105] According to this embodiment, it is possible to prevent the power factor (F0A) of the power supplied to the load in the non-operating state from being determined to be abnormal.

[0106] In a power measurement system (10) according to a fifth aspect, in any one of the first to fourth aspects, the power supply path (C0A) includes a plurality of circuits. The current input terminal (13A) includes a plurality of terminals corresponding to the plurality of circuits, respectively. An input signal according to a current value of an input current (I0A) flowing through a corresponding circuit among the plurality of circuits is input to each of the plurality of terminals. The current measurement unit (14A) measures the input current (I0A) flowing through a corresponding circuit among the plurality of circuits, based on the input signal input to each of the plurality of terminals. The calculation unit (15A) obtains a power factor (F0A) of the power supplied through each of the plurality of circuits. When the input current (I0A) flowing through each of the plurality of circuits is equal to or greater than a set current value (Is0A), the determination unit (16A) individually performs an abnormality determination of the power factor (F0A) of the power supplied through each of the plurality of circuits. The set current value (Is0A) is individually set corresponding to the input current (I0A) flowing through each of the plurality of circuits.

[0107] According to this embodiment, the conditions for determining whether the power factor (F0A) is abnormal can be set individually for each of the multiple circuits.

[0108] In a power measurement system (10) according to a sixth aspect, in any one of the first to fifth aspects, the power supply path (C0A) includes a plurality of circuits. The current input terminal (13A) includes a plurality of terminals respectively corresponding to the plurality of circuits. An input signal according to a current value of an input current (I0A) flowing through a corresponding circuit among the plurality of circuits is input to each of the plurality of terminals. The current measurement unit (14A) measures the input current (I0A) flowing through a corresponding circuit among the plurality of circuits based on the input signal input to each of the plurality of terminals. The calculation unit (15A) calculates a power factor (F0A) of power supplied through each of the plurality of circuits. The determination unit (16A) further includes a setting unit (30A) that individually sets whether or not to perform an abnormality determination for each of the plurality of circuits.

[0109] According to this embodiment, whether or not to perform the power factor (F0A) abnormality determination can be set individually for each of the multiple circuits.

[0110] In a power measurement system (10) according to a seventh aspect, in any of the first to sixth aspects, the judgment unit (16A) judges in the abnormality judgment that the power factor (F0A) is abnormal if the power factor (F0A) for a set time (T2) or longer becomes equal to or lower than a set power factor (Fs0).

[0111] According to this embodiment, it is possible to prevent the determining section (16A) from determining that a temporary decrease in the power factor (F0A) is abnormal.

[0112] In a power measurement system (10) according to an eighth aspect, in any of the first to seventh aspects, when the judgment unit (16A) judges that the power factor (F0A) is abnormal in the abnormality judgment, the judgment unit (16A) estimates a cause of the abnormality in the power factor (F0A) based on the phase difference (Δθ1) between the phase of the input voltage (V0A) and the phase of the input current (I0A).

[0113] According to this embodiment, it becomes easier for a user of the power measurement system (10) to investigate the cause of an abnormality in the power factor (F0A).

[0114] The power measurement system (10) according to a ninth aspect is any of the first to eighth aspects, and further includes a display unit (91) and an operation unit (92). The display unit (91) displays an error message when the power factor (F0A) is determined to be abnormal in the abnormality determination. The operation unit (92) accepts an operation input by a user. When the operation unit (92) accepts an operation input by a user to stop the error display while the display unit (91) is displaying the error message, the display unit (91) stops the error display.

[0115] According to this embodiment, the error display on the display unit (91) can be stopped at the user's discretion.

[0116] In the power measurement system (10) according to the tenth aspect, in the ninth aspect, the judgment unit (16A) does not perform an abnormality judgment if, after the error display stops, at least one of the input voltage (V0A), the input current (I0A), and the power factor (F0A) has the same value as when the error display was displayed.

[0117] According to this aspect, a power factor (F0A) that was previously determined to be abnormal but that is determined by the user to be no problem can be excluded from the abnormality determination.

[0118] An electric power metering device according to an eleventh aspect is provided in the electric power metering system (10) according to any one of the first to tenth aspects. The electric power metering device includes a voltage input terminal (11A), a voltage measuring unit (12A), a current input terminal (13A), a current measuring unit (14A), a calculation unit (15A), and a determination unit (16A).

[0119] According to this embodiment, improper installation of the power measurement system (10) can be detected from the power factor (F0A) of the power.

[0120] A power measurement method according to a twelfth aspect includes a voltage measurement process, a current measurement process, a calculation process, and a determination process. The voltage measurement process measures an input voltage (V0A) input to a voltage input terminal (11A) connected to a power supply line (C0A) to a load. The current measurement process measures an input current (I0A) based on an input signal corresponding to a current value of an input current (I0A) flowing through the power supply line (C0A) input to a current input terminal (13A). The calculation process obtains a power factor (F0A) of power supplied through the power supply line (C0A) based on the measurement results of the input voltage (V0A) and the input current (I0A). The determination process performs an abnormality determination to determine whether or not there is an abnormality in the power factor (F0A). The determination process determines that the power factor (F0A) is abnormal when the power factor (F0A) is equal to or lower than a set power factor (Fs0) in the abnormality determination.

[0121] According to this embodiment, improper installation of the power measurement system (10) can be detected from the power factor (F0A) of the power.

[0122] A program according to a thirteenth aspect is a program for causing a computer system to execute the power measurement method according to the twelfth aspect.

[0123] According to this embodiment, improper installation of the power measurement system (10) can be detected from the power factor (F0A) of the power.

[0124] The second to tenth aspects are not essential components of the power measurement system (10) and may be omitted as appropriate. [Explanation of symbols]

[0125] 10 Power measurement system 91 Display section 92 Operation section 11A voltage input terminal 12A voltage measurement section 13A current input terminal 14A Current measurement section 15A calculation section 16A Judgment section C0A feed line I0A Input current Is0A Set current value F0A Power Factor Fs0 Set power factor T2 setting time V0A Input voltage Δθ1 Phase difference

Claims

1. A voltage input terminal connected to a power supply path to a load; a voltage measurement unit that measures an input voltage input to the voltage input terminal; a current input terminal to which an input signal corresponding to a current value of an input current flowing through the power supply path is input; a current measuring unit that measures the input current based on the input signal input to the current input terminal; a calculation unit that calculates a power factor of the power supplied through the power supply path based on the measurement results of the input voltage and the input current; a determination unit that performs an abnormality determination to determine whether or not the power factor is abnormal, The determination unit determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination, The calculation unit calculates an active power consumed by the load based on the measurement results of the input voltage and the input current, The determination unit, based on history information of the calculation result of the active power, If there is history information in which the calculation result of the effective power is equal to or greater than a set power value, the abnormality determination is not performed, When there is no history information in which the calculation result of the effective power is equal to or greater than the set power value, the abnormality determination is performed. Power measurement system.

2. A voltage input terminal connected to a power supply path to a load; a voltage measurement unit that measures an input voltage input to the voltage input terminal; a current input terminal to which an input signal corresponding to a current value of an input current flowing through the power supply path is input; a current measuring unit that measures the input current based on the input signal input to the current input terminal; a calculation unit that calculates a power factor of the power supplied through the power supply path based on the measurement results of the input voltage and the input current; a determination unit that performs an abnormality determination to determine whether or not the power factor is abnormal, The determination unit determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination, The power supply path includes a plurality of circuits, the current input terminal includes a plurality of terminals respectively corresponding to the plurality of circuits; an input signal corresponding to a current value of an input current flowing through a corresponding one of the plurality of circuits is input to each of the plurality of terminals; the current measurement unit measures the input current flowing through a corresponding circuit among the plurality of circuits based on the input signal input to each of the plurality of terminals; The calculation unit calculates a power factor of power supplied through each of the plurality of circuits, The determination unit may further include a setting unit that individually sets whether or not the abnormality determination is to be performed for each of the plurality of circuits. Power measurement system.

3. A voltage input terminal connected to a power supply path to a load; a voltage measurement unit that measures an input voltage input to the voltage input terminal; a current input terminal to which an input signal corresponding to a current value of an input current flowing through the power supply path is input; a current measuring unit that measures the input current based on the input signal input to the current input terminal; a calculation unit that calculates a power factor of the power supplied through the power supply path based on the measurement results of the input voltage and the input current; a determination unit that performs an abnormality determination to determine whether or not the power factor is abnormal, The determination unit determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination, The determination unit determines that the power factor is abnormal when the power factor is equal to or lower than the set power factor for a set time or longer in the abnormality determination. Power measurement system.

4. The calculation unit calculates an active power consumed by the load based on the measurement results of the input voltage and the input current. The power measurement system according to claim 2 or 3.

5. The determination unit, based on history information of the calculation results of the active power, If there is history information in which the calculation result of the effective power is equal to or greater than a set power value, the abnormality determination is not performed, When there is no history information in which the calculation result of the effective power is equal to or greater than the set power value, the abnormality determination is performed. The power measurement system according to claim 4 .

6. The determination unit performs the abnormality determination when the input current is equal to or greater than a set current value. The power measurement system according to any one of claims 1 to 5.

7. The power supply path includes a plurality of circuits, the current input terminal includes a plurality of terminals respectively corresponding to the plurality of circuits; an input signal corresponding to a current value of an input current flowing through a corresponding one of the plurality of circuits is input to each of the plurality of terminals; the current measurement unit measures the input current flowing through a corresponding circuit among the plurality of circuits based on the input signal input to each of the plurality of terminals; The calculation unit calculates a power factor of power supplied through each of the plurality of circuits, The determination unit performs the abnormality determination individually on the power factor of the power supplied through each of the plurality of circuits when the input current flowing through each of the plurality of circuits is equal to or greater than a set current value that is individually set corresponding to the input current flowing through each of the plurality of circuits. The power measurement system according to any one of claims 1 to 6.

8. The power supply path includes a plurality of circuits, the current input terminal includes a plurality of terminals respectively corresponding to the plurality of circuits; an input signal corresponding to a current value of an input current flowing through a corresponding one of the plurality of circuits is input to each of the plurality of terminals; the current measurement unit measures the input current flowing through a corresponding circuit among the plurality of circuits based on the input signal input to each of the plurality of terminals; The calculation unit calculates a power factor of power supplied through each of the plurality of circuits, The determination unit may further include a setting unit that individually sets whether or not the abnormality determination is to be performed for each of the plurality of circuits. The power measurement system according to claim 1 .

9. The determination unit determines that the power factor is abnormal when the power factor is equal to or lower than the set power factor for a set time or longer in the abnormality determination.

3. The power measurement system according to claim 1 or 2.

10. When it is determined that the power factor is abnormal in the abnormality determination, the determination unit estimates a cause of the power factor abnormality based on a phase difference between the phase of the input voltage and the phase of the input current. The power measurement system according to any one of claims 1 to 9.

11. A display unit that displays an error message when the power factor is determined to be abnormal in the abnormality determination. An operation unit that accepts an operation input by a user, When the operation unit receives an operation input from the user for stopping the error display while the display unit is displaying the error display, the display unit stops the error display. The power measurement system according to any one of claims 1 to 10.

12. The judgment unit does not perform the abnormality judgment if at least one of the input voltage, the input current, and the power factor is the same value as when the error display is displayed after the error display is stopped. The power measurement system of claim 11.

13. A power measurement device provided in the power measurement system according to any one of claims 1 to 12, The voltage input terminal, the voltage measurement unit, the current input terminal, the current measurement unit, the calculation unit, and the determination unit. Power measuring equipment.

14. A voltage measurement process for measuring an input voltage input to a voltage input terminal connected to a power supply path to a load; a current measurement process for measuring an input current based on an input signal corresponding to a current value of the input current flowing through the power supply path and input to a current input terminal; A calculation process for calculating a power factor of the power supplied through the power supply path based on the measurement results of the input voltage and the input current; A determination process for performing an abnormality determination for determining whether or not the power factor is abnormal, The determination process determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination, The calculation process calculates an active power consumed by the load based on the measurement results of the input voltage and the input current; In the determination process, based on history information of the calculation results of the active power, If there is history information in which the calculation result of the effective power is equal to or greater than a set power value, the abnormality determination is not performed, When there is no history information in which the calculation result of the effective power is equal to or greater than the set power value, the abnormality determination is performed. Power measurement methods.

15. A voltage measurement process for measuring an input voltage input to a voltage input terminal connected to a power supply path to a load; a current measurement process for measuring an input current based on an input signal corresponding to a current value of the input current flowing through the power supply path and input to a current input terminal; A calculation process for calculating a power factor of the power supplied through the power supply path based on the measurement results of the input voltage and the input current; A determination process for performing an abnormality determination for determining whether or not the power factor is abnormal, The determination process determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination, The power supply path includes a plurality of circuits, the current input terminal includes a plurality of terminals respectively corresponding to the plurality of circuits; an input signal corresponding to a current value of an input current flowing through a corresponding one of the plurality of circuits is input to each of the plurality of terminals; the current measurement process measures the input current flowing through a corresponding circuit among the plurality of circuits based on the input signal input to each of the plurality of terminals; The calculation process includes calculating a power factor of the power supplied through each of the plurality of circuits; The method further includes a setting process for individually setting whether or not the abnormality determination is to be performed for each of the plurality of circuits in the determination process. Power measurement methods.

16. A voltage measurement process for measuring an input voltage input to a voltage input terminal connected to a power supply path to a load; a current measurement process for measuring an input current based on an input signal corresponding to a current value of the input current flowing through the power supply path and input to a current input terminal; A calculation process for calculating a power factor of the power supplied through the power supply path based on the measurement results of the input voltage and the input current; A determination process for performing an abnormality determination for determining whether or not the power factor is abnormal, The determination process determines that the power factor is abnormal when the power factor is equal to or lower than a set power factor in the abnormality determination, In the determination process, when the power factor is equal to or lower than the set power factor for a set time or longer in the abnormality determination, the power factor is determined to be abnormal. Power measurement methods.

17. A method for causing a computer system to execute the power measurement method according to any one of claims 14 to 16. program.

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