JP7629357B2 - Power measurement system, power measurement device, power measurement method, and program - Google Patents

Description

The present disclosure generally relates to a power measurement system, a power measurement device, a power measurement method, and a program. More specifically, the present disclosure relates to a power measurement system, a power measurement device, a power measurement method, and a program for determining the power of a target circuit.

Patent Document 1 discloses a power measurement system that includes a processing unit and a communication unit. The processing unit determines the power of the circuit according to an operating program based on the detection results of a current sensor that detects the current flowing through the circuit and a voltage detection unit that detects the circuit voltage applied to a voltage input unit connected to each phase of the circuit.

JP 2020-106311 A

The power measurement system described in Patent Document 1 calculates power according to the phase and wire setting corresponding to the connected circuit (target circuit). However, there may be cases where the phase and wire setting is correct but the connection point of the voltage input unit is incorrect, or where the connection point of the voltage input unit is correct but the phase and wire setting is incorrect. In such cases, there is a problem in that it is not possible to detect errors in the phase and wire setting and the connection point of the voltage input unit.

The purpose of this disclosure is to provide a power measurement system, power measurement device, power measurement method, and program that can detect errors in the phase wire settings or the connection points of the voltage input section.

A power measurement system according to an aspect of the present disclosure includes a voltage measurement unit, a phase and wire system setting unit, and a phase and wire system determination unit. The voltage measurement unit measures, as a measurement voltage, an input voltage applied between a plurality of voltage input units electrically connected to a target circuit that is a measurement target. The phase and wire system setting unit receives setting information from an external device, and performs a phase and wire system setting, which is a setting of a phase and wire system corresponding to the target circuit, based on the setting information. The phase and wire system determination unit determines whether or not the measurement voltage is consistent with the phase and wire system setting. The target circuit is one of a plurality of candidate circuits each having a different phase and wire system. The power measurement system further includes a storage unit that stores, as a plurality of determination conditions, information about the input voltage associated with each of the phase and wire systems of the plurality of candidate circuits. The phase and wire system determination unit determines whether or not the measurement voltage is consistent with the phase and wire system setting based on a determination condition corresponding to the phase and wire system set in the phase and wire system setting among the plurality of determination conditions. The target circuit has a multi-wire electrical circuit. The voltage measurement unit measures each of the plurality of input voltages in the multi-wire electric circuit as the measurement voltage, and the plurality of determination conditions are conditions related to a phase difference between each of the plurality of input voltages.
A power measurement system according to an aspect of the present disclosure includes a voltage measurement unit, a phase wire setting unit, a phase wire determination unit, a correction information creation unit, and a presentation unit. The voltage measurement unit measures, as a measurement voltage, an input voltage applied between a plurality of voltage input units electrically connected to a target circuit that is a measurement target. The phase wire setting unit receives setting information from an external source, and performs a phase wire setting, which is a setting of a phase wire corresponding to the target circuit, based on the setting information. The phase wire determination unit determines whether or not the measured voltage is consistent with the phase wire setting. When the phase wire determination unit determines that the measured voltage is not consistent with the phase wire setting, the correction information creation unit creates correction information indicating a means for eliminating a cause of the inconsistency between the input voltage and the phase wire setting. The presentation unit presents the correction information.
A power measurement system according to an aspect of the present disclosure includes a voltage measurement unit, a phase line setting unit, a phase line determination unit, and a fluctuation determination unit. The voltage measurement unit measures, as a measurement voltage, an input voltage applied between a plurality of voltage input units electrically connected to a target circuit that is a measurement target. The phase line setting unit receives setting information from an external device, and performs a phase line setting, which is a setting of a phase line corresponding to the target circuit, based on the setting information. The phase line determination unit determines whether the measured voltage is consistent with the phase line setting. The fluctuation determination unit determines whether the input voltage is abnormal based on a result of comparing the measured voltage with a normal range corresponding to the phase line set in the phase line setting. The fluctuation determination unit determines that the input voltage is abnormal when the measured voltage remains outside the normal range for a predetermined time.

An electric power measuring device according to one aspect of the present disclosure includes the electric power measuring system described above and a housing. The housing houses the electric power measuring system.

A power measurement method according to an aspect of the present disclosure includes a voltage measurement step, a phase and wire setting step, and a voltage determination step. The voltage measurement step measures, as a measurement voltage, an input voltage applied between a plurality of voltage input units electrically connected to a target circuit that is a measurement target. The phase and wire setting step receives setting information from an external device, and performs a phase and wire setting that is a setting of a phase and wire setting corresponding to the target circuit based on the setting information. The voltage determination step determines whether or not the measurement voltage is consistent with the phase and wire setting. The target circuit is one of a plurality of candidate circuits each having a different phase and wire setting. The power measurement method further includes a storage step of storing, as a plurality of determination conditions, information on the input voltage associated with each of the phase and wire settings of the plurality of candidate circuits. The voltage determination step determines whether or not the measurement voltage is consistent with the phase and wire setting based on a determination condition corresponding to the phase and wire setting set in the phase and wire setting among the plurality of determination conditions. The target circuit has a multi-wire circuit. The voltage measurement step measures, as the measurement voltage, each of the plurality of input voltages in the multi-wire circuit. The plurality of determination conditions are conditions related to phase differences between the plurality of input voltages.
A power measurement method according to one aspect of the present disclosure includes a voltage measurement step, a phase and wire setting step, a voltage determination step, a correction information creation step, and a presentation step. The voltage measurement step measures, as a measurement voltage, an input voltage applied between a plurality of voltage input units electrically connected to a target circuit that is a measurement target. The phase and wire setting step receives setting information from an external device, and performs a phase and wire setting that is a setting of a phase and wire setting corresponding to the target circuit based on the setting information. The voltage determination step determines whether or not the measured voltage is consistent with the phase and wire setting. The correction information creation step creates correction information indicating a means for eliminating a cause of the inconsistency between the input voltage and the phase and wire setting when it is determined in the voltage determination step that the measured voltage is not consistent with the phase and wire setting. The presentation step presents the correction information.
A power measurement method according to an aspect of the present disclosure includes a voltage measurement step, a phase and wire setting step, a voltage determination step, and a fluctuation determination step. The voltage measurement step measures, as a measurement voltage, an input voltage applied between a plurality of voltage input units electrically connected to a target circuit that is a measurement target. The phase and wire setting step receives setting information from an external device, and performs a phase and wire setting, which is a setting of a phase and wire setting corresponding to the target circuit, based on the setting information. The voltage determination step determines whether or not the measured voltage is consistent with the phase and wire setting. The fluctuation determination step determines whether or not the input voltage is abnormal based on a result of comparing the measured voltage with a normal range corresponding to the phase and wire setting set in the phase and wire setting. The fluctuation determination step determines that the input voltage is abnormal if the measured voltage continues to deviate from the normal range for a predetermined time.

A program according to one aspect of the present disclosure is a program for causing a computer system to execute the above-described power measurement method.

The present disclosure has the advantage of being able to detect errors in the phase and wire settings or the connection points of the voltage input section.

FIG. 1 is an explanatory diagram showing a schematic configuration of a power measuring device according to an embodiment. FIG. 2 is a block diagram showing the configuration of the power measuring device connected to a three-phase, three-wire target circuit. FIG. 3 is a block diagram showing the configuration of the power measuring device connected to a single-phase three-wire target circuit. FIG. 4 is a block diagram showing the configuration of the power measuring device connected to a single-phase two-wire target circuit. FIG. 5 is a diagram illustrating a change over time in a measured voltage measured by the voltage measuring unit of the above embodiment. FIG. 6 is a diagram illustrating a change over time in a measured voltage measured by the voltage measuring unit of the above embodiment. FIG. 7 is a flowchart showing the determination operation of the phase line determination unit of the above embodiment. FIG. 8 is a flowchart showing the determination operation of the fluctuation determination unit of the above embodiment.

(Embodiment)
(1) Overview Hereinafter, an overview of a power measurement system 10 according to an embodiment will be described with reference to FIGS. 1 to 5. FIG.

As shown in FIG. 1, the power measurement system 10 of the embodiment includes a voltage measurement unit 11, a phase wire type determination unit 142, and a phase wire type setting unit 143. The power measurement system 10 is used by being placed in a distribution board cabinet at a consumer such as a factory or an office. The power measurement system 10 measures a three-phase three-wire target circuit EC1 (see FIG. 2), a single-phase three-wire target circuit EC2 (see FIG. 3), or a single-phase two-wire target circuit EC3 (see FIG. 4). That is, the three-phase three-wire target circuit EC1, the single-phase three-wire target circuit EC2, and the single-phase two-wire target circuit EC3 are multiple candidate circuits each having a different phase wire type. The target circuit EC is any one of the multiple candidate circuits.

The power measurement system 10 detects the voltage and current of each phase of the target circuit EC to determine the power of the target circuit EC. Here, "power of the target circuit EC" means at least one of the instantaneous value of power supplied at a certain measurement point of the target circuit EC and the amount of power supplied in a specified period of time at a certain measurement point of the target circuit EC. In this embodiment, the "power" determined by the power measurement system 10 is active power, but it may also be apparent power or reactive power.

The voltage measurement unit 11 measures the input voltage applied to multiple voltage input units 12a, 12b, and 12c that are electrically connected to the target circuit EC that is the measurement target, as a measurement voltage V. The multiple voltage input units 12a, 12b, and 12c are terminals that are connected to the voltage lines of the target circuit EC. For example, a person who installs a power measurement system in the target circuit EC (hereinafter referred to as the installer) connects the multiple voltage input units 12a, 12b, and 12c to the voltage lines of the target circuit EC.

The phase and wire setting unit 143 receives setting information from the outside and performs phase and wire setting, which is the setting of the phase and wire corresponding to the target circuit EC, based on the setting information. Here, the outside refers to the configuration excluding the phase and wire setting unit 143.

The phase and wire system determination unit 142 determines whether the measured voltage V is consistent with the phase and wire system setting.

From the above, when the phase wire determination unit determines that the measured voltage V is not consistent with the phase wire setting, it is possible that the phase wire setting unit has set the phase wire setting based on incorrect setting information, or that the input voltage has been connected to an unintended location. Therefore, there is an advantage in that it is possible to detect errors in the phase wire setting or in the connection points of the multiple voltage input units 12a, 12b, and 12c.

(2) Detailed Configuration (2-1) Power Measurement System Hereinafter, a detailed configuration of the power measurement system 10 of the present embodiment will be described with reference to FIGS.

As shown in FIG. 2, the power measurement system 10 of this embodiment includes a base unit 1 and a display unit 2.

2, the basic unit of this embodiment includes a voltage measurement unit 11, a plurality of voltage input units 12a, 12b, and 12c, a signal conversion unit 13, a control unit 14, an external communication unit 15, a connection unit 16, a notification unit 17, and a connector CN1. The connector CN1 is connected to a connector CN2 (described later) of the display unit 2.

(Voltage measurement section)
The voltage measurement unit 11 measures the input voltages applied between a plurality of voltage input units 12a, 12b, and 12c electrically connected to the respective phases of the target circuit EC as measurement voltages Vab, Vbc, and Vca. The voltage measurement unit 11 outputs information on the measurement voltages Vab, Vbc, and Vca to the control unit 14. When there is no need to distinguish between the measurement voltages Vab, Vbc, and Vca, they are referred to as measurement voltages V.

A more specific explanation will be given with reference to FIG. 2. The voltage measurement unit 11 measures the input voltage applied between the voltage input unit 12a and the voltage input unit 12b as the measurement voltage Vab. Similarly, the voltage measurement unit 11 measures the input voltage applied between the voltage input unit 12b and the voltage input unit 12c as the measurement voltage Vbc. The voltage measurement unit 11 then measures the input voltage applied between the voltage input unit 12c and the voltage input unit 12a as the measurement voltage Vca. The voltage measurement unit 11 is connected to the control unit 14 via a signal line, and outputs a voltage measurement signal S1 including information on the measurement voltages Vab, Vbc, and Vca to the control unit 14.

(Signal conversion section)
The signal conversion unit 13 is connected to a plurality of current sensors 19 (four in FIG. 2). Each current sensor 19 is a device disposed outside the power measurement system 10. Each current sensor 19 is, for example, a current transformer (CT). Each current sensor 19 detects a current flowing through the circuit EC1 and outputs a current detection signal S2, which is a current signal, to the signal conversion unit 13 as a detection result. The signal conversion unit 13 converts the current detection signal S2 from each current sensor 19 into a voltage and outputs it to the control unit 14. Hereinafter, the signal (voltage) output from the signal conversion unit 13 to the control unit 14 is referred to as a current measurement signal S3. Note that, although the signal conversion unit 13 of this embodiment is connected to four current sensors 19, the signal conversion unit 13 can be connected to a maximum of eight current sensors 19. However, the maximum number of current sensors 19 connected is not limited to eight.

(Control Unit)
The control unit 14 includes a processing unit 141 , a phase wire system determination unit 142 , a phase wire system setting unit 143 , a storage unit 144 , a fluctuation determination unit 145 , and a correction information creation unit 146 .

The control unit 14 is preferably equipped with a computer system. In the computer system, a processor such as a CPU (Central Processing Unit) or an MPU (Micro Processing Unit) reads and executes a program stored in a memory, thereby realizing some or all of the functions of the control unit 14. The computer system has a processor that operates according to a program as its main hardware configuration. The type of processor is not important as long as it can realize the function by executing the program. The processor is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or an LSI (large scale integration). Here, it is called an IC or an LSI, but the name changes depending on the degree of integration, and it may be called a system LSI, a VLSI (Very Large Scale Integration), or an ULSI (Ultra Large Scale Integration). A field programmable gate array (FPGA) that is programmed after the LSI is manufactured, or a reconfigurable logic device that can reconfigure the connection relationship inside the LSI or set up the circuit partition inside the LSI, can also be used for the same purpose. Multiple electronic circuits may be integrated into one chip or provided on multiple chips. The multiple chips may be integrated into one device, or may be provided in multiple devices.

(Phase and wire setting section)
The phase and wire system setting unit 143 of this embodiment receives setting information input by the installer, and performs phase and wire system setting, which is setting of the phase and wire system corresponding to the target circuit EC, based on the setting information. As shown in FIG. 2, the basic unit 1 further has an input unit 18 into which the installer inputs the setting information. In this embodiment, as an example, the input unit 18 is a dip switch. In this case, each of the phase and wire systems of the multiple candidate circuits is associated with a combination of dip switch positions. Therefore, the installer can input the setting information by selecting the dip switch position associated with the target circuit EC to be measured from among the multiple candidate circuits. The input unit 18 outputs the setting information input by the installer to the phase and wire system setting unit 143.

In addition, when the target circuit EC is either a three-phase three-wire system or a single-phase two-wire system, the phase and wire system setting unit 143 further sets whether the target circuit EC is a 100V system or a 200V system based on the setting information.

(Memory unit)
The storage unit 144 stores information about input voltages associated with each of the phase line systems of the multiple candidate circuits as multiple judgment conditions C1. The multiple judgment conditions C1 in this embodiment are conditions related to the magnitude of the measured voltage V. The storage unit 144 is, for example, a Read Only Memory (ROM), a Random Access Memory (RAM), or an Electrically Erasable Programmable Read Only Memory (EEPROM). In this embodiment, the storage unit 144 functions as a memory for the control unit 14. In other words, the storage unit 144 further stores a program (operation program) for operating the control unit 14.

The following describes in detail the judgment condition C1 for each phase and line system of the target circuit EC.

When the measurement target is a three-phase, three-wire target circuit EC1, each of the multiple voltage input units 12a, 12b, and 12c is electrically connected to each of the three phases (R phase, S phase, and T phase) of the target circuit EC1, as shown in Fig. 2. Since an input voltage of equal effective value is applied between each phase in the three-phase, three-wire target circuit EC1, the judgment condition C1 can be expressed by the following formula (1).
Vab=Vbc=Vca...... Formula (1)

When the measurement target is a single-phase three-wire target circuit EC2, as shown in Fig. 3, each of the multiple voltage input units 12a, 12b is electrically connected to each of two voltage lines (R phase, T phase) of the target circuit EC2. Meanwhile, the voltage input unit 12c is electrically connected to the neutral line (N phase) of the target circuit EC2. In the single-phase three-wire target circuit EC2, the effective values of the voltage between the R phase and the N phase and the voltage between the T phase and the N phase are equal, and the voltage between the T phase and the N phase is in the opposite phase to the voltage between the R phase and the N phase, so that the judgment condition C1 can be expressed by the following formula (2).
Vbc = Vca and Vbc + Vca = Vab ... (2)

When the measurement target is a single-phase two-wire target circuit EC3, as shown in FIG. 4, the voltage input unit 12a is electrically connected to the voltage line (R phase) of the target circuit EC3. On the other hand, the voltage input unit 12b is electrically connected to the neutral line (N phase) of the target circuit EC3. The voltage input unit 12c is not connected to the target circuit EC3. The judgment condition C1 is that Vab is within the range of the rated voltage of the voltage input unit 12a. For example, the upper limit of the rated voltage of the voltage input unit 12a is determined based on the maximum expected input voltage. Similarly, the lower limit of the rated voltage of the voltage input unit 12a is determined based on the minimum expected input voltage. Specifically, the upper limit of the rated voltage of the voltage input unit 12a is 264V, which is 10% increased from the effective value of the maximum expected input voltage of 240V. The lower limit of the rated voltage of the voltage input unit 12a is 85V, which is 15% decreased from the effective value of the minimum expected input voltage of 100V.

(Phase/wire type determination section)
The phase and wire system determination unit 142 determines whether the measured voltage V is consistent with the phase and wire system setting based on the determination condition C1 corresponding to the phase and wire system set in the phase and wire system setting among the multiple determination conditions C1. More specifically, the phase and wire system determination unit 142 selects the determination condition C1 corresponding to the phase and wire system set in the phase and wire system setting from the multiple determination conditions C1, and performs a consistency determination that the measured voltage V is consistent with the phase and wire system setting if the effective value of the measured voltage V satisfies the determination condition C1. The control unit 14 then outputs the result of the consistency determination to the notification unit 17, which will be described later. On the other hand, if the measured voltage V does not satisfy the determination condition C1, a non-consistency determination is performed that the measured voltage V is not consistent with the phase and wire system setting. The control unit 14 then outputs the result of the non-consistency determination to the notification unit 17.

(Corrective Information Creation Department)
When the phase and wire determination unit 142 determines that the measured voltage V does not match the phase and wire setting, the correction information creation unit 146 creates correction information indicating a means for eliminating the cause of the inconsistency between the input voltage and the phase and wire setting. The correction information is, for example, information that prompts the installer to recheck whether the connection points of the multiple voltage input units 12a, 12b, and 12c or the setting information inputted by the input unit 18 are correct.

(Processing section)
The voltage measurement signal S1 from the voltage measurement unit 11 is input to the control unit 14 via a signal line. Also, the current detection signal S2 from the current sensor 19 is input to the control unit 14 as a current measurement signal S3 via the signal conversion unit 13. The control unit 14 performs A/D conversion on the voltage measurement signal S1 and the current measurement signal S3. The processing unit 141 obtains the power of the circuit EC. For example, the processing unit 141 corrects the error of the voltage measurement signal S1 and the error of the current measurement signal S3. As a specific example, the processing unit 141 corrects the error of the voltage measurement signal S1 by multiplying the voltage measurement signal S1 by a correction coefficient stored in the storage unit 144. The processing unit 141 corrects the error of the current measurement signal S3 by multiplying the current measurement signal S3 by another correction coefficient stored in the storage unit 144. Each correction coefficient is determined by comparing a theoretical value with a measured value when the power measurement system 10 is manufactured. The processing unit 141 calculates the power of the target circuit EC by multiplying the corrected voltage measurement signal S1 by the corrected current measurement signal S3. Since up to eight current sensors 19 can be connected to the basic unit 1, when the measurement target is a three-phase three-wire target circuit EC1 or a single-phase three-wire target circuit EC2, the processing unit 141 can determine the power at up to four measurement points. On the other hand, when the measurement target is a single-phase two-wire target circuit EC3, the processing unit 141 can determine the power at up to eight measurement points. The control unit 14 outputs a communication signal S4 including information regarding the value of the power of the target circuit EC to the display unit 2.

(Fluctuation determination unit)
The fluctuation determination unit 145 determines whether the input voltage is abnormal based on the result of comparing the measured voltage V with the normal range C2 corresponding to the phase line system set in the phase line system setting. In this embodiment, the fluctuation determination unit 145 determines that the input voltage is abnormal if the measured voltage V is out of the normal range C2 for a predetermined time Tp set in advance. That is, if the measured voltage V does not return to the normal range C2 within the predetermined time Tp, the fluctuation determination unit 145 performs an abnormality determination that the input voltage is abnormal. Then, the control unit 14 outputs the result of the abnormality determination to the notification unit 17. On the other hand, if the measured voltage V returns to the normal range C2 within the predetermined time Tp, the fluctuation determination unit 145 performs a normal determination that the input voltage is normal, and continues the determination operation of whether the input voltage is abnormal. Note that the voltage measurement unit 11 measures the input voltage applied between the multiple voltage input units 12a, 12b, and 12c electrically connected to each phase of the target circuit EC as the measured voltage V at regular time intervals.

As shown in FIG. 5, if the measured voltage V falls outside the normal range C2 at time T1a, and the measured voltage V continues to fall outside the normal range C2 at time T1b, a predetermined time Tp after time T1a, the fluctuation determination unit 145 performs an abnormality determination at time T1b. More specifically, if the measured voltage V exceeds the upper limit of the normal range C2 at time T1a, and the measured voltage V continues to exceed the upper limit of the normal range C2 at time T1b, a predetermined time Tp after time T1a, as shown in FIG. 5, the fluctuation determination unit 145 performs an abnormality determination at time T1b. The normal range C2 is defined based on the rated voltage of the voltage input unit.

On the other hand, as shown in FIG. 6, if the measured voltage V falls out of the normal range C2 at time T2a and returns to the normal range C2 at time T2c when a predetermined time Tp has not elapsed since time T2a, the fluctuation determination unit 145 makes a normal determination at time T2c. More specifically, if the measured voltage V falls below the lower limit of the normal range C2 at time T2a and exceeds the lower limit of the normal range C2 at time T2c when a predetermined time Tp has not elapsed since time T2a, the fluctuation determination unit 145 makes a normal determination at time T2c. Note that time T2b shown in FIG. 6 is the time when a predetermined time Tp has elapsed since time T2a.

Next, the normal range C2 will be explained in detail for each phase wiring system of the target circuit EC.

When the measurement target is a three-phase, three-wire target circuit EC1, the target circuit EC1 is either a 100 V system or a 200 V system. Therefore, when the target circuit EC1 is a 100 V system, the normal range C2 is expressed by the following formula (3), for example.
Vab = 100V ± 10% and Vbc = 100V ± 10% and Vca = 100V ± 10% ……… (3)

Therefore, if at least one of the measured voltages Vab, Vbc, and Vca remains outside the range expressed by formula (3) for a predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal.

On the other hand, when the target circuit EC1 is a 200V system, as an example, the normal range C2 is expressed by the following formula (4).
Vab = 200V ± 10% and Vbc = 200V ± 10% and Vca = 200V ± 10% ……… (4)

Therefore, if at least one of the measured voltages Vab, Vbc, and Vca remains outside the range expressed by equation (4) for a predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal.

When the measurement target is a single-phase three-wire target circuit EC2, a voltage of effective value of 100 V is applied between the R phase and the N phase, and between the T phase and the N phase. Therefore, as an example, the normal range C2 is expressed by the following formula (5).
Vbc = 100V ± 10% and Vca = 100V ± 10% ……… (5)

Therefore, if at least one of the measured voltages Vbc and Vca remains outside the range expressed by equation (5) for a predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal.

When the measurement target is a single-phase, two-wire target circuit EC3, the target circuit EC3 is either a 100V system or a 200V system. Therefore, when the target circuit EC3 is a 100V system, as an example, the normal range C2 is expressed by the above formula (3), as in the case where the measurement target is a three-phase, three-wire target circuit EC1. Therefore, when at least one of the measurement voltages Vab, Vbc, and Vca continues to fall outside the range expressed by formula (3) for a preset predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal.

On the other hand, when the target circuit EC3 is a 200V system, the normal range C2 is expressed by the above formula (4), as in the case where the measurement target is a three-phase, three-wire target circuit EC1, for example. Therefore, if at least one of the measurement voltages Vab, Vbc, and Vca remains outside the range expressed by formula (4) for a predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal.

(External Communications Department)
The external communication unit 15 has a function of communicating with an external device. The external device is a device other than the display unit 2. In the present embodiment, as an example, the external device is a controller configured to control or monitor a device compatible with a Home Energy Management System (HEMS) (hereinafter, referred to as a HEMS-compatible device). The controller is a device disposed outside the power measurement system 10. The HEMS-compatible device includes, for example, a smart meter, a solar power generation device, a power storage device, a fuel cell, an electric vehicle, an air conditioner, a lighting fixture, a hot water supply device, a refrigerator, or a television set. The external communication unit 15 can transmit information on the power value of the target circuit EC to the controller.

The communication method between the external communication unit 15 and the controller is wireless communication using radio waves as a medium, conforming to a communication standard such as a 920 MHz specific low-power radio station (a radio station that does not require a license), Wi-Fi (registered trademark), or Bluetooth (registered trademark). The communication method between the external communication unit 15 and the controller may be wired communication conforming to a communication standard such as a wired LAN (Local Area Network). The communication protocol for communication between the external communication unit 15 and the controller is, for example, RS-485, Ethernet (registered trademark), ECHONET Lite (registered trademark), etc.

(Connection)
A storage medium is connected to the connection unit 16. In the present embodiment, as an example, the storage medium is an SD card. That is, the connection unit 16 is a slot for the SD card. When the SD card is connected to the connection unit 16, it becomes possible to communicate with the control unit 14. That is, the connection unit 16 can store information on the power value of the circuit EC1 in the storage medium (SD card) connected to the connection unit 16.

(Notification Department)
The notification unit 17 notifies the outside of at least one of the determination results of the phase line determination unit 142 and the fluctuation determination unit 145. In the present embodiment, as an example, the notification unit 17 has an audio device such as a speaker. The notification unit 17 may audibly present at least one of the determination results of the phase line determination unit 142 and the fluctuation determination unit 145 by generating a sound in the surroundings. The sound is, for example, a beep sound that is repeatedly played.

(2-1-2) Display Unit The display unit 2 has a presentation unit 21, an operation unit 22, and a connector CN2, as shown in Fig. 2. The connector CN2 is connected to the connector CN1 of the basic unit. The display unit 2 is capable of communication via the connector CN2.

(Presentation section)
The presentation unit 21 presents the correction information created by the correction information creation unit 146. More specifically, the control unit 14 outputs the correction information created by the correction information creation unit 146 to the presentation unit 21 via the connector CN1, and the presentation unit 21 presents the correction information received from the control unit 14. The presentation unit 21 is, for example, a display such as a liquid crystal display or an organic EL (Electroluminescence) display.

The presentation unit 21 may have audio equipment such as a speaker, and may present the correction information as auditory information in addition to visual information.

The presentation unit 21 further presents information such as, for example, the judgment result of at least one of the phase line judgment unit 142 and the fluctuation judgment unit 145, the power value of the target circuit EC, the effective voltage value based on the voltage measurement signal S1, and the effective current value based on the current measurement signal S3.

(Operation section)
The operation unit 22 includes, for example, a plurality of buttons. The operation unit 22 accepts setting operations related to the power measurement system 10. When a person who wants to check the power value of the target circuit EC (for example, an installer or a person who manages a consumer) performs a setting operation on the operation unit 22, for example, the content presented on the presentation unit 21 is changed.

(2-2) Power Measuring Device The power measuring device of this embodiment includes the above-described power measuring system 10 and a housing 3, as shown in FIG.

The housing 3 is box-shaped and houses the power measurement system 10.

(2-3) Power Measurement Method The power measurement method of this embodiment includes a voltage measurement step, a phase and wire system setting step, and a voltage determination step.

The voltage measurement step measures the input voltage applied between each of the multiple voltage input units 12a, 12b, and 12c electrically connected to the target circuit EC that is the measurement target as a measurement voltage V. The phase and wire setting step receives setting information from the outside, and performs phase and wire setting, which is setting of the phase and wire corresponding to the target circuit EC, based on the setting information.

The voltage determination step determines whether the measured voltage V is consistent with the phase and wire system setting. This will be explained in more detail. The power measurement method of this embodiment further includes a storage step. The storage step stores information about the input voltages associated with each of the phase and wire systems of the multiple candidate circuits as multiple determination conditions C1. Then, the phase and wire system setting step determines whether the measured voltage V is consistent with the phase and wire system setting based on the determination condition C1 corresponding to the phase and wire system set in the phase and wire system setting among the multiple determination conditions C1.

The power measurement method of this embodiment further includes a fluctuation determination step. The fluctuation determination step determines whether the input voltage is abnormal or not based on the result of comparing the measured voltage V with the normal range C2 corresponding to the phase wire system set in the phase wire system setting. More specifically, the fluctuation determination unit determines that the input voltage is abnormal when the measured voltage V falls outside the normal range for a predetermined time Tp that has been set in advance.

The power measurement method of this embodiment further includes a notification step. The notification step notifies the outside of at least one of the determination results of the phase/wire type determination step and the fluctuation determination step.

The power measurement method of this embodiment further includes a current detection step and a current calculation step. The current detection step detects the current flowing through the target circuit EC. The current calculation step calculates the power of the target circuit EC based on the measured voltage V and the current.

(3) Operation (3-1) Determination Operation of Phase Wire System Determining Unit The determination operation of the phase wire system determining unit 142 will be described below with reference to FIG.

First, the voltage measurement unit 11 measures the input voltage applied between each of the multiple voltage input units 12a, 12b, and 12c that are electrically connected to each phase of the target circuit EC as a measurement voltage V (S11), and outputs a voltage measurement signal S1 including information on the measurement voltage V to the control unit 14. Then, the phase line setting unit 143 receives the setting information input by the installer, and performs phase line setting, which is the setting of the phase line corresponding to the target circuit EC, based on the setting information (S12). After that, the phase line determination unit 142 determines whether the measured voltage V is consistent with the phase line setting based on the determination condition C1 corresponding to the phase line setting among the multiple determination conditions C1 (S13).

If the measured voltage V satisfies the judgment condition C1 corresponding to the phase and wire system set in the phase and wire system setting (S13: YES), the phase and wire system judgment unit 142 performs a consistency judgment that the measured voltage V is consistent with the phase and wire system setting (S14). The control unit 14 outputs the result of the consistency judgment to the notification unit 17, and the notification unit 17 notifies the outside of the result of the consistency judgment (S15).

Then, the current sensor 19 detects the current flowing through the circuit EC1 (S16) and outputs the detection result as a current detection signal S2 to the signal conversion unit 13. The signal conversion unit 13 converts the current detection signal S2 from each current sensor 19 into a voltage and outputs a current measurement signal S3 to the processing unit 141. The processing unit 141 calculates the power of the target circuit EC by multiplying the corrected voltage measurement signal S1 by the corrected current measurement signal S3 (S17), and outputs a signal including information about the power value of the target circuit EC to the presentation unit 21 via the connectors CN1 and CN2. The presentation unit 21 presents the power value of the target circuit EC (S18).

On the other hand, if the measured voltage V does not satisfy the judgment condition C1 corresponding to the phase wire system set in the phase wire system setting (S13: NO), the phase wire system judgment unit 142 makes a non-matching judgment that the measured voltage V is not consistent with the phase wire system setting (S19). The control unit 14 outputs the result of the non-matching judgment to the notification unit 17, and the notification unit 17 notifies the result of the non-matching judgment to the outside (S1A). Thereafter, the correction information creation unit 146 creates correction information indicating a means for eliminating the cause of the non-matching between the input voltage and the phase wire system setting (S1B). The control unit 14 outputs the correction information created by the correction information creation unit 146 to the presentation unit 21 via the connector CN1, and the presentation unit 21 presents the correction information received from the control unit 14 (S1C).

(3-2) Determination Operation of Fluctuation Determining Unit The determination operation of the fluctuation determining unit 145 of this embodiment will be described below with reference to FIG.

First, the voltage measurement unit 11 measures the input voltage applied between each of the multiple voltage input units 12a, 12b, and 12c that are electrically connected to each phase of the target circuit EC as a measurement voltage V (S21), and outputs a voltage measurement signal S1 including information on the measurement voltage V to the control unit 14. Then, the fluctuation determination unit 145 determines whether the measurement voltage V is outside the normal range C2 corresponding to the phase line type set in the phase line type setting (S22).

If the measured voltage V is not outside the normal range C2 (S22: NO), that is, if the measured voltage V is within the normal range C2, the voltage measurement unit 11 again measures the input voltage as the measured voltage V (S21).

If the measured voltage V is outside the normal range C2 (S22: YES), i.e., if the measured voltage V is not within the normal range C2, the fluctuation determination unit 145 determines whether the state in which the measured voltage V is outside the normal range C2 continues for a predetermined time Tp (S23).

If the measured voltage V does not remain outside the normal range C2 for a preset time Tp (S23: NO), i.e., if the measured voltage V returns to the normal range C2 within the preset time Tp, the fluctuation determination unit 145 determines that the input voltage is normal (S26). After that, the voltage measurement unit 11 again measures the input voltage as the measured voltage V (S21).

If the measured voltage V remains outside the normal range C2 for a preset time Tp (S23: NO), i.e., if the measured voltage V does not return to the normal range C2 within the preset time Tp, the fluctuation determination unit 145 performs an abnormality determination that the input voltage is abnormal (S24). The control unit 14 outputs the result of the abnormality determination to the notification unit 17, and the notification unit 17 notifies the outside of the result of the abnormality determination (S25).

(4) Modifications The above-described embodiment is merely one of various embodiments of the present disclosure. The above-described embodiment can be modified in various ways depending on the design, etc., as long as the object of the present disclosure can be achieved. The following modifications may be realized in appropriate combination. In addition, a function equivalent to the power measurement method may be embodied in a power measurement method, a computer program, or a recording medium on which a program is recorded, etc.

The program according to one embodiment is a program for causing a computer system to execute the above-mentioned power measurement method.

The multiple judgment conditions C1 in this embodiment are conditions related to the magnitude of the measured voltage V, but may also be conditions related to the phase difference between the multiple input voltages. A more detailed explanation will be given. The target circuit EC has a multi-wire circuit, and the voltage measurement unit 11 measures each of the multiple input voltages in the multi-wire circuit as the measured voltage V. In the above case, the multiple judgment conditions C1 may also be conditions related to the phase difference between the multiple input voltages. Note that the target circuit EC having a multi-wire circuit is, for example, a three-phase three-wire target circuit EC1 or a single-phase three-wire target circuit EC2.

Specifically, when the target circuit EC is a three-phase three-wire target circuit EC1, the phase difference between the voltages applied between the phases is 120°. Therefore, the phase and wire determination unit 142 can determine whether the measured voltage V is consistent with the phase and wire setting based on the determination condition C1 related to the phase difference between each of the multiple input voltages.

In addition, when the target circuit EC is a single-phase three-wire target circuit EC2, the voltage between the T phase and the N phase is in the opposite phase to the voltage between the R phase and the N phase. Therefore, the phase wire determination unit 142 can determine whether the measured voltage V is consistent with the phase wire setting based on the determination condition C1 related to the phase difference between each of the multiple input voltages.

The phase and wire system setting unit 143 of this embodiment sets whether the target circuit EC is a 100V system or a 200V system based on the setting information when the target circuit EC is either a three-phase three-wire system or a single-phase two-wire system. However, the control unit 14 may have an automatic determination unit that automatically determines whether the target circuit EC is a 100V system or a 200V system when the target circuit EC is either a three-phase three-wire system or a single-phase two-wire system.

The basic unit 1 of this embodiment may have an expansion connection part CN3 for connecting to an expansion unit or a different system unit. The expansion unit calculates the power of the target circuit EC based on the current flowing at a point in the target circuit EC other than the current sensor 19 and the measured voltage V measured by the basic unit 1. The different system unit calculates the power of a circuit other than the target circuit EC and outputs the calculation result to the display unit 2 via the basic unit 1.

Whether or not the power measurement system 10 of this embodiment includes a fluctuation determination unit 145 is optional. If the power measurement system 10 does not include a fluctuation determination unit 145, the notification unit 17 notifies the outside of the determination result of the phase line type determination unit 142.

In this embodiment, the basic unit 1 is equipped with the notification unit 17, but the display unit 2 may also be equipped with the notification unit 17.

The notification unit 17 of this embodiment may have a light-emitting element. The notification unit 17 may visually present the determination result of at least one of the phase line determination unit 142 and the fluctuation determination unit 145 by emitting light. The light-emitting element is, for example, an LED (Light Emitting Diode). Note that the notification unit 17 may have both an audio device and a light-emitting element.

(summary)
As described above, the power measurement system (10) according to the first aspect includes a voltage measurement unit (11), a phase and wire system setting unit (143), and a phase and wire system determination unit (142). The voltage measurement unit (11) measures, as a measured voltage (V), an input voltage applied between each of a plurality of voltage input units (12a, 12b, 12c) electrically connected to a target circuit (EC) that is a measurement target. The phase and wire system setting unit (143) receives setting information from the outside, and performs a phase and wire system setting, which is a setting of a phase and wire system corresponding to the target circuit (EC), based on the setting information. The phase and wire system determination unit (142) determines whether or not the measured voltage (V) is consistent with the phase and wire system setting.

This aspect has the advantage that it is possible to detect errors in the phase and wire settings or in the connection points of multiple voltage input sections (12a, 12b, 12c).

In the power measurement system (10) according to the second aspect, in the first aspect, the target circuit (EC) is one of a plurality of candidate circuits each having a different phase wire system. The power measurement system (10) according to the second aspect further includes a storage unit (144) that stores information on the input voltages associated with each of the phase wire systems of the plurality of candidate circuits as a plurality of judgment conditions (C1). The phase wire system judgment unit (142) judges whether the measured voltage (V) is consistent with the phase wire system setting based on the judgment condition (C1) corresponding to the phase wire system set in the phase wire system setting among the plurality of judgment conditions (C1).

This aspect has the advantage that it is possible to detect errors in the setting of the phase wire system or in the connection points of multiple voltage input units (12a, 12b, 12c) based on a judgment formula corresponding to the phase wire system.

In the power measurement system (10) according to the third aspect, in the second aspect, the multiple judgment conditions (C1) are conditions related to the magnitude of the measured voltage (V).

This aspect has the advantage that it is possible to detect errors in the phase and wire settings or in the connection points of multiple voltage input sections (12a, 12b, 12c) based on the magnitude of the measured voltage (V).

In the power measurement system (10) according to the fourth aspect, in the second aspect, the target circuit (EC) has a multi-wire electrical circuit. The voltage measurement unit (11) measures each of the multiple input voltages in the multi-wire electrical circuit as a measurement voltage (V). The multiple judgment conditions (C1) are conditions related to the phase difference between each of the multiple input voltages.

This aspect has the advantage that it is possible to detect errors in the phase line settings or the connection points of the multiple voltage input sections (12a, 12b, 12c) based on the phase differences between the multiple input voltages.

The power measurement system (10) according to the fifth aspect is any one of the first to fourth aspects, and further includes a fluctuation determination unit (145). The fluctuation determination unit (145) determines whether the input voltage is abnormal or not based on the result of comparing the measured voltage (V) with the normal range (C2) corresponding to the phase line system set in the phase line system setting.

This has the advantage of being able to determine whether the input voltage is abnormal.

In the power measurement system (10) according to the sixth aspect, in the fifth aspect, the fluctuation determination unit (145) determines that the input voltage is abnormal if the measured voltage (V) remains outside the normal range (C2) for a predetermined period of time.

This aspect has the advantage that, when a temporary input voltage fluctuation occurs due to a load change or the like, an abnormality determination is not performed, and it is possible to accurately determine whether the input voltage is abnormal or not.

The seventh aspect of the power measurement system (10) in any one of the first to fourth aspects further includes a notification unit (17) that notifies the outside of the determination result of the phase line determination unit (142).

This aspect has the advantage of preventing the phase wire system or the connection points of the multiple voltage input units (12a, 12b, 12c) from being operated in an incorrect state.

The power measurement system (10) according to the eighth aspect is the fifth or sixth aspect, and further includes a notification unit (17) that notifies the outside of the determination result of at least one of the phase line determination unit (142) and the fluctuation determination unit (145).

This aspect has the advantage of preventing operation with incorrect phase and wire settings or incorrect connection points for multiple voltage input units (12a, 12b, 12c) and with abnormal input voltages.

The power measurement system (10) according to the ninth aspect is any one of the first to eighth aspects, and further includes a correction information creation unit (146) and a presentation unit (21). When the phase wire determination unit (142) determines that the measured voltage (V) is not consistent with the phase wire setting, the correction information creation unit (146) creates correction information indicating a means for eliminating the cause of the inconsistency between the input voltage and the phase wire setting. The presentation unit (21) presents the correction information.

This aspect has the advantage that the installer can address errors in the phase and wire settings or the connection points of the multiple voltage input sections (12a, 12b, 12c) based on the correction information.

The power measurement system (10) according to the tenth aspect is any one of the first to ninth aspects, and further includes a current sensor and a processing unit (141). The current sensor detects a current flowing through the target circuit (EC). The processing unit (141) calculates the power of the target circuit (EC) based on the measured voltage (V) and the current.

This has the advantage of preventing the installer from measuring unintended power.

The power measurement device (100) according to the eleventh aspect includes a power measurement system (10) according to any one of the first to tenth aspects and a housing (3) that houses the power measurement system (10).

This aspect has the advantage of being able to provide a power measurement device (100) that has the above-mentioned effects of the power measurement system (10).

The power measurement method according to the twelfth aspect includes a power measurement step, a phase and wire setting step, and a voltage measurement step. In the power measurement step, an input voltage applied between each of a plurality of voltage input units (12a, 12b, 12c) electrically connected to a target circuit (EC) that is the measurement target is measured as a measurement voltage (V). In the phase and wire setting step, setting information is received from the outside, and a phase and wire setting that is a setting of the phase and wire corresponding to the target circuit (EC) is performed based on the setting information. In the voltage determination step, it is determined whether or not the measurement voltage (V) is consistent with the phase and wire setting.

This aspect has the advantage that it is possible to detect errors in the phase and wire settings or the connection points of multiple voltage input sections (12a, 12b, 12c) without using a dedicated power measurement system (10).

The program according to the thirteenth aspect causes a computer system to execute the power measurement method according to the twelfth aspect.

This aspect has the advantage that it is possible to detect errors in the phase and wire settings or in the connection points of multiple voltage input sections (12a, 12b, 12c) without using a dedicated power measurement system (10).

REFERENCE SIGNS LIST 100 Power measuring device 10 Power measuring system 11 Voltage measuring unit 12a, 12b, 12c Voltage input unit 141 Processing unit 142 Phase and wire type determination unit 143 Phase and wire type setting unit 144 Storage unit 145 Fluctuation determination unit 146 Correction information creation unit 17 Notification unit 21 Presentation unit 3 Housing V (Vab, Vbc, Vca) Measured voltage EC Target circuit C1 Determination condition C2 Normal range

Claims (13)

a voltage measurement unit that measures, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units that are electrically connected to a target circuit that is a measurement target;
a phase and wire system setting unit that receives setting information from an external device and performs a phase and wire system setting that is a setting of a phase and wire system corresponding to the target circuit based on the setting information;
a phase and wire system determination unit that determines whether the measured voltage is consistent with the phase and wire system setting ,
the target circuit is any one of a plurality of candidate circuits each having a different phase wiring system;
a storage unit configured to store information about the input voltages associated with each of the phase and line systems of the plurality of candidate circuits as a plurality of determination conditions;
the phase and wire system determination unit determines whether or not the measured voltage is consistent with the phase and wire system setting based on a determination condition corresponding to the phase and wire system set in the phase and wire system setting among the plurality of determination conditions;
The target circuit has a multi-wire circuit,
The voltage measurement unit measures each of the plurality of input voltages in the multi-wire electrical circuit as the measurement voltage;
The plurality of determination conditions are conditions related to a phase difference between each of the plurality of input voltages.
1. A power measurement system comprising: a voltage measurement unit that measures, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units that are electrically connected to a target circuit that is a measurement target;
a phase and wire system setting unit that receives setting information from an external device and performs a phase and wire system setting that is a setting of a phase and wire system corresponding to the target circuit based on the setting information;
a phase and wire system determination unit that determines whether the measured voltage is consistent with the phase and wire system setting;
a correction information creation unit that creates correction information indicating a means for eliminating a cause of the inconsistency between the input voltage and the phase and wire system setting when the phase and wire system determination unit determines that the measured voltage does not match the phase and wire system setting;
A presentation unit that presents the correction information.
1. A power measurement system comprising: a voltage measurement unit that measures, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units that are electrically connected to a target circuit that is a measurement target;
a phase and wire system setting unit that receives setting information from an external device and performs a phase and wire system setting that is a setting of a phase and wire system corresponding to the target circuit based on the setting information;
a phase and wire system determination unit that determines whether the measured voltage is consistent with the phase and wire system setting ;
a fluctuation determination unit that determines whether the input voltage is abnormal based on a result of comparing the measured voltage with a normal range corresponding to the phase and wire system set in the phase and wire system setting,
The fluctuation determination unit determines that the input voltage is abnormal when the measured voltage continues to be outside the normal range for a predetermined time period.
1. A power measurement system comprising: the target circuit is any one of a plurality of candidate circuits each having a different phase wiring system;
a storage unit configured to store information about the input voltages associated with each of the phase and line systems of the plurality of candidate circuits as a plurality of determination conditions;
The phase and wire system determination unit determines whether or not the measured voltage is consistent with the phase and wire system setting based on a determination condition corresponding to the phase and wire system set in the phase and wire system setting among the plurality of determination conditions.
4. The power measurement system according to claim 2 or 3 . The plurality of determination conditions are conditions related to the magnitude of the measured voltage.
5. The power measurement system according to claim 4. The phase/wire type determination unit may further include a notification unit that notifies an external device of a result of the determination.
3. The power measurement system according to claim 1, wherein the power measurement system is a power measurement system. The power supply device further includes a notification unit that notifies an external device of a determination result of at least one of the phase/wire determination unit and the fluctuation determination unit.
4. The power measurement system according to claim 3. a current sensor for detecting a current flowing through the target circuit;
a processing unit that calculates the power of the target circuit based on the measured voltage and the current.
8. The power measurement system according to claim 1, wherein the power measurement system is a power measurement system for measuring a power supply voltage. A power measurement system according to any one of claims 1 to 8,
A housing that houses the power measurement system.
1. An electric power measuring device comprising: a voltage measuring step of measuring, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units electrically connected to a target circuit that is a measurement target;
a phase and wire system setting step of receiving setting information from an external device and setting a phase and wire system corresponding to the target circuit based on the setting information;
a voltage determination step of determining whether the measured voltage is consistent with the phase and wire system setting;
the target circuit is any one of a plurality of candidate circuits each having a different phase wiring system;
a storage step of storing information about the input voltages associated with each of the phase and line systems of the plurality of candidate circuits as a plurality of determination conditions;
the voltage determination step determines whether or not the measured voltage is consistent with the phase and wire system setting based on a determination condition corresponding to a phase and wire system set in the phase and wire system setting among the plurality of determination conditions;
The target circuit has a multi-wire circuit,
The voltage measuring step measures each of the plurality of input voltages in the multi-wire electrical circuit as the measurement voltage;
The plurality of determination conditions are conditions related to a phase difference between each of the plurality of input voltages.
2. A power measurement method comprising: a voltage measuring step of measuring, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units electrically connected to a target circuit that is a measurement target;
a phase and wire system setting step of receiving setting information from an external device and setting a phase and wire system corresponding to the target circuit based on the setting information;
a voltage determination step of determining whether the measured voltage is consistent with the phase and wire system setting;
a correction information creating step of creating correction information indicating a means for eliminating a cause of the inconsistency between the input voltage and the phase and wire system setting when it is determined in the voltage determining step that the measured voltage does not match the phase and wire system setting;
and a presentation step of presenting the correction information.
2. A power measurement method comprising: a voltage measuring step of measuring, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units electrically connected to a target circuit that is a measurement target;
a phase and wire system setting step of receiving setting information from an external device and setting a phase and wire system corresponding to the target circuit based on the setting information;
a voltage determination step of determining whether the measured voltage is consistent with the phase and wire system setting;
and a fluctuation determination step of determining whether or not the input voltage is abnormal based on a result of comparing the measured voltage with a normal range corresponding to the phase and wire system set in the phase and wire system setting,
The fluctuation determination step determines that the input voltage is abnormal if the measured voltage continues to be out of the normal range for a predetermined time period.
2. A power measurement method comprising: In the computer system,
To execute the power measurement method according to any one of claims 10 to 12 ,
program.

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