JP2022191005A - Power measuring system, power measuring device, power measuring method, and program - Google Patents

Abstract

To provide a power measuring system capable of detecting erroneous phase wire system setting or erroneous connection point of a voltage input part, a power measuring device, a power measuring method, and a program.SOLUTION: A power measuring system 10 includes a voltage measuring unit 11, a phase wire system setting unit 143, and a phase wire system determination unit 142. The voltage measuring unit 11 measures an input voltage that is applied between multiple voltage input parts 12a, 12b, 12c which are electrically connected to a target circuit EC to be measured as a measured voltage V. The phase wire system setting unit 143 receives setting information from outside and performs phase wire system setting that is a setting of a phase wire system corresponding to the target circuit EC based on the setting information. The phase wire system determination unit 142 determines whether or not the measured voltage V is consistent with the phase wire system setting.SELECTED DRAWING: Figure 1

Description

The present disclosure generally relates to power metering systems, power metering devices, power metering methods, and programs. More specifically, the present disclosure relates to a power measurement system, a power measurement device, a power measurement method, and a program for obtaining power of a target circuit.

Patent Literature 1 discloses a power measurement system including a processing unit and a communication unit. The processing unit adjusts the power of the circuit based on the detection results of the current sensor that detects the current flowing through the circuit and the voltage detection unit that detects the circuit voltage applied to the voltage input unit connected to each phase of the circuit. Obtained according to the operation program.

Japanese Patent Application Laid-Open No. 2020-106311

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

An object of the present disclosure is to provide a power measurement system, a power measurement device, a power measurement method, and a program that can detect an error in the setting of the phase wire system or the connection point of the voltage input unit. .

A power measurement system according to an aspect of the present disclosure includes a voltage measurement unit, a phase line system setting unit, and a phase line system determination unit. The voltage measurement section measures, as a measurement voltage, an input voltage applied between each of a plurality of voltage input sections electrically connected to a circuit to be measured. The phase/wire system setting unit receives setting information from the outside, and performs phase/wire system setting, which is a setting of a phase/wire system corresponding to the target circuit, based on the setting information. The phase and wire system determining unit determines whether or not the measured voltage matches the phase and wire system setting.

A power measuring device according to an aspect of the present disclosure includes the power measuring system described above and a housing. The housing accommodates the power measurement system.

A power measurement method according to an aspect of the present disclosure includes a voltage measurement step, a phase line system setting step, and a voltage determination step. In the voltage measurement step, an input voltage applied between each of a plurality of voltage input units electrically connected to a target circuit to be measured is measured as a measurement voltage. The phase-and-wire system setting step receives setting information from the outside, and sets a phase-and-wire system corresponding to the target circuit based on the setting information. The voltage determination step determines whether the measured voltage matches the phase wire system setting.

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

According to the present disclosure, there is an advantage that it is possible to detect an error in the setting of the phase wire system or the connection point 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 the target circuit of the three-phase three-wire system. FIG. 3 is a block diagram showing the configuration of the same power measuring device connected to a single-phase three-wire target circuit. FIG. 4 is a block diagram showing the configuration of the same power measuring device connected to a single-phase two-wire target circuit. FIG. 5 is a diagram for explaining temporal changes in the measured voltage measured by the voltage measuring unit. FIG. 6 is a diagram for explaining temporal changes in the measured voltage measured by the voltage measuring unit. FIG. 7 is a flow chart showing the determination operation of the phase line system determination unit of the same. FIG. 8 is a flow chart showing the determination operation of the variation determination unit of the same.

(embodiment)
(1) Overview An overview of the power measurement system 10 according to the embodiment will be described below with reference to FIGS. 1 to 5. FIG.

The power measurement system 10 of the embodiment includes a voltage measurement unit 11, a phase line system determining unit 142, and a phase line system setting unit 143, as shown in FIG. The power measurement system 10 is used by being arranged in a cabinet of a distribution board, for example, in a consumer such as a factory or an office. The power measurement system 10 includes 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). ) is to be measured. That is, the target circuit EC1 of the three-phase three-wire system, the target circuit EC2 of the single-phase three-wire system, or the target circuit EC3 of the single-phase two-wire system are a plurality of candidate circuits with different phase and wire systems. The target circuit EC is one of a plurality of candidate circuits.

The power measurement system 10 detects the voltage of each phase and the current of each phase of the target circuit EC to obtain the power of the target circuit EC. Here, the "power of the target circuit EC" means the instantaneous value of the power supplied at a certain measurement point of the target circuit EC, and the amount of power supplied at a certain measurement point of the target circuit EC for a predetermined period. means at least one Further, in the present embodiment, the "power" obtained by the power measurement system 10 is active power, but it may be apparent power or reactive power.

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

The phase-and-wire system setting unit 143 receives setting information from the outside, and performs phase-and-wire system setting corresponding to the target circuit EC based on the setting information. The external here indicates the configuration except for the phase wire system setting unit 143 .

The phase and wire system determination unit 142 determines whether or not the measured voltage V matches the phase and wire system setting.

From the above, when the phase-and-wire system determination unit determines that the measured voltage V does not match the phase-and-wire system setting, the phase-and-wire system setting unit performs phase-and-wire system setting based on incorrect setting information, and when the input voltage is connected to an unintended location. Therefore, there is an advantage that it is possible to detect errors in the setting of the phase wire system or in the connection points of the plurality of voltage input sections 12a, 12b, 12c.

(2) Detailed Configuration (2-1) Power Measuring System A detailed configuration of the power measuring system 10 of the present embodiment will be described below with reference to FIGS. 2 to 8. FIG.

The power measurement system 10 of this embodiment includes a basic unit 1 and a display unit 2, as shown in FIG.

(2-1-1) Basic Unit The basic unit of the present embodiment includes, as shown in FIG. 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 of the display unit 2, which will be described later.

(Voltage measurement section)
The voltage measurement unit 11 measures input voltages applied between the plurality of voltage input units 12a, 12b, and 12c electrically connected to each phase of the target circuit EC as measurement voltages Vab, Vbc, and Vca. do. Voltage measurement unit 11 outputs information on measured voltages Vab, Vbc, and Vca to control unit 14 . Measured voltages Vab, Vbc, and Vca are referred to as measured voltages V when they are not distinguished from each other.

More specifically, FIG. 2 is used and demonstrated. 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, voltage measurement section 11 measures the input voltage applied between voltage input section 12b and voltage input section 12c as measurement voltage Vbc. Then, the voltage measuring section 11 measures the input voltage applied between the voltage input section 12c and the voltage input section 12a as the measurement voltage Vca. The voltage measurement section 11 is connected to the control section 14 via a signal line, and outputs a voltage measurement signal S1 including information on the measured voltages Vab, Vbc, and Vca to the control section 14 .

(Signal converter)
The signal converter 13 is connected to a plurality of (four in FIG. 2) current sensors 19 . Each current sensor 19 is a device arranged outside the power measurement system 10 . Each current sensor 19 is, for example, a current transformer (CT: Current Transformer). 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 converter 13 as a detection result. The signal converter 13 converts the current detection signal S2 from each current sensor 19 into a voltage and outputs the voltage to the controller 14 . The signal (voltage) output from the signal converter 13 to the controller 14 is hereinafter referred to as a current measurement signal S3. Although the signal converter 13 of this embodiment is connected to four current sensors 19, the signal converter 13 can be connected to eight current sensors 19 at maximum. However, the maximum number of connections of the current sensors 19 is not limited to eight.

(control part)
The control unit 14 has 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 generation unit 146 .

Control unit 14 preferably comprises a computer system. In the computer system, a processor such as a CPU (Central Processing Unit) or MPU (Micro Processing Unit) reads out and executes a program stored in a memory, thereby implementing some or all of the functions of the control unit 14. be. A computer system has a processor that operates according to a program as a main hardware configuration. Any type of processor can be used as long as it can implement functions by executing a program. The processor is composed of one or more electronic circuits including a semiconductor integrated circuit (IC) or LSI (large scale integration). Although they are called ICs and LSIs here, they may be called system LSIs, VLSIs (Very Large Scale Integrations), or ULSIs (Ultra Large Scale Integrations) depending on the degree of integration. A field programmable gate array (FPGA), which is programmed after the LSI is manufactured, or a reconfigurable logic device capable of reconfiguring the junction relationships inside the LSI or setting up circuit partitions inside the LSI for the same purpose. can be done. A plurality of electronic circuits may be integrated on one chip or may be provided on a plurality of chips. A plurality of chips may be integrated into one device, or may be provided in a plurality of devices.

(Phase and wire system setting section)
The phase-and-wire system setting unit 143 of the present embodiment receives setting information input by the installer, and performs phase-and-wire system setting corresponding to the target circuit EC based on the setting information. As shown in FIG. 2, the basic unit 1 further has an input section 18 through which the installer inputs setting information. As an example in this embodiment, the input unit 18 is a DIP switch. In this case, each of the phase wire systems of a plurality of candidate circuits is associated with a combination of DIP switch positions. Therefore, the installer can input the setting information by selecting the position of the DIP switch linked to the target circuit EC, which is the target of measurement, from among the plurality of candidate circuits. The input unit 18 outputs the setting information input by the installer to the phase 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 sets whether the target circuit EC is a 100V system or a 200V system. Further setting based on information.

(storage unit)
The storage unit 144 stores, as a plurality of determination conditions C1, information related to input voltages associated with the respective phase wire systems of the plurality of candidate circuits. A plurality of determination conditions C1 in this embodiment are conditions related to the magnitude of the measured voltage V. FIG. The storage unit 144 is, for example, a ROM (Read Only Memory), a RAM (Random Access Memory), or an EEPROM (Electrically Erasable Programmable Read Only Memory). Further, 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 determination condition C1 for each phase line system of the target circuit EC will be specifically described below.

When the object to be measured is a three-phase, three-wire object circuit EC1, as shown in FIG. T phase). In the three-phase, three-wire target circuit EC1, equal effective input voltages are applied between the phases, so the determination condition C1 can be expressed by the following equation (1).
Vab=Vbc=Vca ………… (1) Formula

When the object to be measured is a single-phase three-wire target circuit EC2, as shown in FIG. are electrically connected to each of the On the other hand, the voltage input section 12c is electrically connected to the neutral line (N phase) of the target circuit EC2. In the target circuit EC2 of the single-phase three-wire system, the voltage between the R phase and the N phase and the voltage between the T phase and the N phase have the same effective value, and the voltage between the T phase and the N phase is , R phase and N phase, the determination condition C1 can be expressed by the following equation (2).
Vbc=Vca and Vbc+Vca=Vab (2) Formula

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

(Phase and wire type determination unit)
The phase-and-wire system determination unit 142 determines whether or not the measured voltage V matches 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 plurality of determination conditions C1. judge. 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 among the plurality of determination conditions C1, and determines the effective value of the measured voltage V. If the condition C1 is satisfied, it is determined that the measured voltage V matches the phase and wire system setting. Then, the control unit 14 outputs the result of matching 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, it is determined that the measured voltage V does not match the phase and wire system setting. Then, the control unit 14 outputs the result of non-matching determination to the notification unit 17 .

(Correction Information Creation Department)
When the phase and wire system determination unit 142 determines that the measured voltage V does not match the phase and wire system setting, the correction information creating unit 146 presents means for eliminating the cause of the mismatch between the input voltage and the phase and wire system setting. Create remediation information. The correction information is, for example, information that prompts the installer to reconfirm whether the connection points of the plurality of voltage input units 12a, 12b, and 12c or the setting information input by the input unit 18 is correct.

(Processing part)
A 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 section 14 via the signal conversion section 13 as the current measurement signal S3. The control unit 14 A/D converts the voltage measurement signal S1 and the current measurement signal S3. The processing unit 141 obtains the power of the circuit EC. The processing unit 141 corrects, for example, the error in the voltage measurement signal S1 and the error in the current measurement signal S3. As a specific example, the processing unit 141 corrects an error in the voltage measurement signal S1 by multiplying the voltage measurement signal S1 by the correction coefficient stored in the storage unit 144 . The processing unit 141 multiplies the current measurement signal S3 by another correction coefficient stored in the storage unit 144 to correct the error of the current measurement signal S3. Each correction factor is determined by comparing a theoretical value and a measured value when the power metering system 10 is manufactured. The processing unit 141 calculates the power of the target circuit EC by multiplying the corrected voltage measurement signal S1 and the corrected current measurement signal S3. Since a maximum of eight current sensors 19 can be connected to the basic unit 1, when the object to be measured is the target circuit EC1 of the three-phase three-wire system or the target circuit EC2 of the single-phase three-wire system, the processing unit 141 can obtain power at a maximum of four measurement points. On the other hand, when the object to be measured is the single-phase two-wire object circuit EC3, the processing unit 141 can obtain power at a maximum of eight measurement points. The control unit 14 outputs to the display unit 2 a communication signal S4 including information about the power value of the target circuit EC.

(fluctuation determination unit)
The variation 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 and wire system set in the phase and wire system setting. The variation determination unit 145 of the present embodiment determines that the input voltage is abnormal when the measured voltage V remains out of the normal range C2 for a predetermined time Tp. That is, when the measured voltage V does not return to the normal range C2 within the predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal. The control unit 14 then outputs the result of the abnormality determination to the notification unit 17 . On the other hand, when the measured voltage V returns to the normal range C2 within the predetermined time Tp, the fluctuation determination unit 145 determines that the input voltage is normal, and determines whether the input voltage is abnormal. continue. Note that the voltage measurement unit 11 measures the input voltage applied between each of the plurality of voltage input units 12a, 12b, and 12c electrically connected to each phase of the target circuit EC at regular time intervals. Measured as voltage V.

As shown in FIG. 5, at time T1a, the measured voltage V deviates from the normal range C2, and at time T1b after the lapse of a predetermined time Tp from time T1a, the measured voltage V continues to deviate from the normal range C2. In this case, the fluctuation determination unit 145 performs abnormality determination at time T1b. More specifically, the measured voltage V exceeds the upper limit of the normal range C2 at time T1a, and the state in which the measured voltage V exceeds the upper limit of the normal range C2 continues at time T1b after a predetermined time Tp has elapsed from time T1a. If so, the fluctuation determination unit 145 performs abnormality determination at time T1b. The normal range C2 is defined based on the rated voltage of the voltage input section.

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

Next, the normal range C2 will be specifically described for each phase line system of the target circuit EC.

If the object to be measured is a 3-phase, 3-wire circuit under test EC1, the circuit under test EC1 is either a 100V system or a 200V system. Therefore, when the target circuit EC1 is of the 100V system, as an example, the normal range C2 is expressed by the following equation (3).
Vab=100V±10% and Vbc=100V±10% and Vca=100V±10% ………… Equation (3)

Therefore, when at least one of the measured voltages Vab, Vbc, and Vca continues to be out of the range represented by the formula (3) for a predetermined time period Tp, the fluctuation determination unit 145 determines that the input voltage is determined to be abnormal.

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

Therefore, when at least one of the measured voltages Vab, Vbc, and Vca continues to be out of the range represented by the formula (4) for a predetermined time period Tp, the fluctuation determination unit 145 determines that the input voltage is determined to be abnormal.

When the object to be measured is a single-phase three-wire object circuit EC2, a voltage with an 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 represented by the following formula (5).
Vbc=100V±10% and Vca=100V±10% ………… Equation (5)

Therefore, when at least one of the measured voltages Vbc and Vca is out of the range represented by the formula (5) for a predetermined time period Tp, the fluctuation determination unit 145 determines that the input voltage is abnormal. Determine that there is.

When the object to be measured is a single-phase two-wire system object circuit EC3, the object 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 equation (3), similarly to the case where the target circuit EC1 is a three-phase, three-wire system. Therefore, when at least one of the measured voltages Vab, Vbc, and Vca continues to be out of the range represented by the formula (3) for a predetermined time period Tp, the fluctuation determination unit 145 determines that the input voltage is determined to be abnormal.

On the other hand, when the target circuit EC3 is of the 200V system, for example, the normal range C2 is expressed by the above equation (4) in the same way as when the target circuit EC1 of the 3-phase, 3-wire system is measured. Therefore, when at least one of the measured voltages Vab, Vbc, and Vca continues to be out of the range represented by the formula (4) for a predetermined time period Tp, the fluctuation determination unit 145 determines that the input voltage is determined to be abnormal.

(external communication section)
The external communication unit 15 has a function of communicating with an external device. An external device is a device other than the display unit 2 . As an example in this embodiment, the external device is a controller configured to control or monitor a device compatible with HEMS (Home Energy Management System) (hereinafter referred to as HEMS compatible device). A controller is a device arranged outside the power measurement system 10 . HEMS-compatible devices include, for example, smart meters, solar power generation devices, power storage devices, fuel cells, electric vehicles, air conditioners, lighting fixtures, water heaters, refrigerators, television receivers, and the like. 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, for example, a 920 MHz band specified low-power radio station (radio station that does not require a license), Wi-Fi (registered trademark), or Bluetooth (registered trademark). It is a standard-compliant wireless communication using radio waves as a medium. A 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). Communication protocols for communication between the external communication unit 15 and the controller are, for example, RS-485, Ethernet (registered trademark), ECHONETLite (registered trademark), and the like.

(connection part)
A storage medium is connected to the connection unit 16 . As an example in this embodiment, the storage medium is an SD card. That is, the connection section 16 is a slot for an SD card. The SD card becomes communicable with the control unit 14 when connected to the connection unit 16 . That is, the connection unit 16 can store information on the power value of the circuit EC1 in a storage medium (SD card) connected to the connection unit 16. FIG.

(notification section)
The notification unit 17 notifies the determination result of at least one of the phase line system determination unit 142 and the fluctuation determination unit 145 to the outside. In this embodiment, as an example, the notification unit 17 has an audio device such as a speaker. The notification unit 17 may audibly present the determination result of at least one of the phase line system determination unit 142 and the variation determination unit 145 by emitting a sound to the surroundings. The sound is, for example, a repeatedly reproduced beep sound.

(2-1-2) Display Unit As shown in FIG. 2, the display unit 2 has a presentation section 21, an operation section 22, and a connector CN2. The connector CN2 is connected to the connector CN1 of the basic unit. The display unit 2 can communicate via the connector CN2.

(presentation part)
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.

In addition, the presentation unit 21 may have an audio device such as a speaker, and may present the correction information as auditory information together with the visual information.

In addition, the presentation unit 21, for example, determines the determination result of at least one of the phase and wire system determination unit 142 and the fluctuation determination unit 145, the power value of the target circuit EC, the voltage effective value based on the voltage measurement signal S1, and the current measurement signal. Information such as current rms based on S3 is also presented.

(operation part)
The operation unit 22 includes, for example, multiple buttons. The operation unit 22 receives setting operations regarding 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. be.

(2-2) Power Measuring Device As shown in FIG. 1, the power measuring device of this embodiment includes the power measuring system 10 and the housing 3 described above.

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

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

In the voltage measurement step, the input voltage applied between each of the plurality of voltage input sections 12a, 12b, and 12c electrically connected to the target circuit EC to be measured is measured as the measurement voltage V. FIG. The phase and wire system setting step receives setting information from the outside, and performs phase and wire system setting, which is a phase and wire system setting corresponding to the target circuit EC, based on the setting information.

The voltage determination step determines whether the measured voltage V matches the phase and wire system setting. A more detailed description will be given. The power measurement method of this embodiment further includes a storage step. The storing step stores, as a plurality of determination conditions C1, information regarding input voltages associated with each of the phase wire systems of the plurality of candidate circuits. The phase and wire system setting step determines whether or not the measured voltage V matches the phase and wire system setting based on the judgment condition C1 corresponding to the phase and wire system set in the phase and wire system setting among the plurality of judgment conditions C1. judge.

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

The power measurement method of this embodiment further includes a notification step. The notification step notifies the outside of at least one determination result of the phase and wire system determination step and the variation determination step.

Moreover, the power measurement method of the present 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. Then, 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 and Wire System Determining Section The determination operation of the phase and wire system determining section 142 will be described below with reference to FIG.

First, the voltage measurement unit 11 measures the input voltage applied between each of the plurality of voltage input units 12a, 12b, and 12c electrically connected to each phase of the target circuit EC as the measurement voltage V ( S 11 ), a voltage measurement signal S 1 containing information on the measured voltage V is output to the control section 14 . Then, the phase/wire system setting unit 143 receives the setting information input by the installer, and sets the phase/wire system corresponding to the target circuit EC based on the setting information (S12). After that, the phase-and-wire system determining unit 142 determines whether or not the measured voltage V matches 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 plurality of determination conditions C1. (S13).

When the measured voltage V satisfies the determination condition C1 corresponding to the phase and wire system set in the phase and wire system setting (S13: YES), the phase and wire system determination unit 142 determines that the measured voltage V matches the phase and wire system setting. Matching determination is performed (S14). The control unit 14 outputs the result of the matching determination to the notification unit 17, and the notification unit 17 notifies the result of the matching determination to the outside (S15).

After that, the current sensor 19 detects the current flowing through the circuit EC1 (S16), and outputs the detection result to the signal converter 13 as the current detection signal S2. The signal converter 13 converts the current detection signal S2 from each current sensor 19 into a voltage and outputs the current measurement signal S3 to the processor 141 . The processing unit 141 calculates the power of the target circuit EC by multiplying the corrected voltage measurement signal S1 and the corrected current measurement signal S3 (S17), and outputs the power to the target circuit EC via the connector CN1 and the connector CN2. A signal including information on the value of the EC power is output to the presentation unit 21 . 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 determination condition C1 corresponding to the phase and wire system set in the phase and wire system setting (S13: NO), the phase and wire system determination unit 142 determines that the measured voltage V does not meet the phase and wire system setting. A non-matching determination is made to indicate that there is no matching (S19). The control unit 14 outputs the result of the non-matching determination to the notification unit 17, and the notification unit 17 notifies the result of the non-matching determination to the outside (S1A). After that, the correction information creation unit 146 creates correction information indicating means for eliminating the cause of mismatch 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 Determination Section The determination operation of the variation determination section 145 of the present embodiment will be described below with reference to FIG.

First, the voltage measurement unit 11 measures the input voltage applied between each of the plurality of voltage input units 12a, 12b, and 12c electrically connected to each phase of the target circuit EC as the measurement voltage V ( S21), and outputs a voltage measurement signal S1 including information on the measured voltage V to the control unit 14. FIG. Then, the variation determination unit 145 determines whether or not the measured voltage V is outside the normal range C2 corresponding to the phase and wire system set in the phase and wire system 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 measuring unit 11 measures the input voltage again as the measured voltage V (S21 ).

If the measured voltage V is outside the normal range C2 (S22: YES), that is, if the measured voltage V is not within the normal range C2, the fluctuation determination unit 145 determines that the measured voltage V is out of the normal range C2. It is determined whether or not it continues over a preset predetermined time Tp (S23).

If the state in which the measured voltage V is out of the normal range C2 does not continue for a predetermined time Tp (S23: NO), that is, if the measured voltage V returns to the normal range C2 within the predetermined time Tp, The fluctuation determination unit 145 determines that the input voltage is normal (S26). After that, the voltage measurement unit 11 measures the input voltage as the measurement voltage V again (S21).

When the measured voltage V remains out of the normal range C2 for a predetermined time Tp (S23: NO), that is, when the measured voltage V does not return to the normal range C2 within the predetermined time Tp, The fluctuation determination unit 145 determines 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 result of the abnormality determination to the outside (S25).

(4) Modifications The above-described embodiment is just one of various embodiments of the present disclosure. The above-described embodiments can be modified in various ways according to design and the like as long as the object of the present disclosure can be achieved. The following modified examples may be implemented in combination as appropriate. Also, a function equivalent to the power measurement method may be embodied by a power measurement method, a computer program, or a recording medium recording the program.

A program according to one embodiment is a program for causing a computer system to execute the power measurement method described above.

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

Specifically, when the target circuit EC is a 3-phase, 3-wire target circuit EC1, the phase difference between the voltages applied between the phases is 120°. Therefore, the phase-and-wire system determination unit 142 can determine whether or not the measured voltage V matches the phase-and-wire system setting based on the determination condition C1 regarding the phase difference between each of the plurality of input voltages.

Further, 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 the opposite phase of the voltage between the R-phase and the N-phase. Therefore, the phase-and-wire system determination unit 142 can determine whether or not the measured voltage V matches the phase-and-wire system setting based on the determination condition C1 regarding the phase difference between each of the plurality of input voltages.

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

The basic unit 1 of the present embodiment may have an expansion connection section CN3 that connects with an expansion unit or a heterogeneous system unit. The extension unit calculates the power of the target circuit EC based on the current flowing in the target circuit EC at a location different from the current sensor 19 and the measured voltage V measured by the basic unit 1 . The heterogeneous system unit calculates the power of a circuit different from the target circuit EC and outputs the calculation result to the display unit 2 via the basic unit 1 .

It is optional whether or not the power measurement system 10 of the present embodiment includes the fluctuation determination unit 145 . If the power measurement system 10 does not include the fluctuation determination unit 145, the notification unit 17 notifies the determination result of the phase line system determination unit 142 to the outside.

In this embodiment, the base unit 1 has the notification section 17 , but the display unit 2 may have the notification section 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 system determination unit 142 and the variation 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 the acoustic device and the light emitting element.

(summary)
As described above, the power measurement system (10) according to the first aspect includes a voltage measurement section (11), a phase line system setting section (143), and a phase line system determination section (142). . A voltage measurement unit (11) converts an input voltage applied between each of a plurality of voltage input units (12a, 12b, 12c) electrically connected to a target circuit (EC) to be measured into a measurement voltage (V ). A phase-and-wire system setting unit (143) receives setting information from the outside, and performs phase-and-wire system setting corresponding to the target circuit (EC) based on the setting information. A phase and wire system determination unit (142) determines whether or not the measured voltage (V) matches the phase and wire system setting.

According to this aspect, there is an advantage that it is possible to detect an error in the setting of the phase wire system or in the connection points of the plurality of voltage input units (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 with different phase wire systems. The power measurement system (10) according to the second aspect further includes a storage unit (144) that stores, as a plurality of determination conditions (C1), information regarding input voltages associated with each of the phase wire systems of the plurality of candidate circuits. Prepare. A phase-and-wire system determination unit (142) determines whether the measured voltage (V) is determined according to the phase-and-wire system based on the determination condition (C1) corresponding to the phase-and-wire system set in the phase-and-wire system setting among the plurality of determination conditions (C1). Determines whether or not it matches the setting.

According to this aspect, there is an advantage that it is possible to detect an error in the setting of the phase wire system or the connection points of the plurality of voltage input units (12a, 12b, 12c) based on the determination formula corresponding to the phase wire system. be.

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

According to this aspect, there is an advantage that it is possible to detect an error in the setting of the phase wire system or the connection points of the plurality of voltage input units (12a, 12b, 12c) based on the magnitude of the measured voltage (V). be.

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

According to this aspect, based on the phase difference between each of the plurality of input voltages, it is possible to detect an error in the setting of the phase wire system or the connection points of the plurality of voltage input units (12a, 12b, 12c). There are advantages.

A power measurement system (10) according to a fifth aspect, in any one of the first to fourth aspects, further comprises a fluctuation determining section (145). A 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 and wire system set in the phase and wire system setting. judge.

According to this aspect, there is an advantage that it is possible to determine whether or not the input voltage is abnormal.

In the power measurement system (10) according to the sixth aspect, in the fifth aspect, the fluctuation determination section (145) determines that the measured voltage (V) is out of the normal range (C2) for a preset predetermined time. , it is determined that the input voltage is abnormal.

According to this aspect, there is an advantage that it is possible to accurately determine whether or not the input voltage is abnormal without performing an abnormality determination when a temporary input voltage variation occurs due to a load variation or the like.

A power measurement system (10) according to a seventh aspect, in any one of the first to fourth aspects, further comprises a notification unit (17) for notifying the outside of the determination result of the phase line system determination unit (142). .

According to this aspect, there is an advantage that it is possible to prevent operation with an incorrect phase wire system setting or connection points of the plurality of voltage input units (12a, 12b, 12c).

In the power measurement system (10) according to the eighth aspect, in the fifth or sixth aspect, the determination result of at least one of the phase line system determination unit (142) and the fluctuation determination unit (145) is output to the outside. A notification unit (17) for notification is further provided.

According to this aspect, it is possible to prevent operation in a state in which the phase wire system is set incorrectly or the connection points of the plurality of voltage input units (12a, 12b, 12c) are incorrect, and in a state in which the input voltage is abnormal. has the advantage of being able to

A power measurement system (10) according to a ninth aspect, in any one of the first to eighth aspects, further comprises a correction information creation section (146) and a presentation section (21). A correction information creation unit (146) eliminates the cause of inconsistency between the input voltage and the phase and wire system setting when the phase and wire system determination unit (142) determines that the measured voltage (V) does not match the phase and wire system setting. Create remediation information that indicates the steps to take. A presentation unit (21) presents correction information.

According to this aspect, there is an advantage that the installer can deal with errors in the setting of the phase wire system or the connection points of the plurality of voltage input units (12a, 12b, 12c) based on the correction information.

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

According to this aspect, there is an advantage that it is possible to prevent the installer from measuring the power unintended.

A power measuring device (100) according to an eleventh aspect includes the power measuring system (10) according to any one of the first to tenth aspects, and a housing (3) housing the power measuring system (10). Prepare.

According to this aspect, there is an advantage that the power measuring device (100) having the above effects of the power measuring system (10) can be provided.

A power measurement method according to a twelfth aspect includes a power measurement step, a phase line system setting step, and a voltage measurement step. In the power measurement step, the input voltage applied between each of the plurality of voltage input units (12a, 12b, 12c) electrically connected to the target circuit (EC) to be measured is measured as the measurement voltage (V). do. The phase-and-wire system setting step receives setting information from the outside, and performs phase-and-wire system setting corresponding to the target circuit (EC) based on the setting information. The voltage determination step determines whether the measured voltage (V) matches the phase wire system setting.

According to this aspect, it is possible to detect an error in the setting of the phase wire system or the connection points of the plurality of voltage input units (12a, 12b, 12c) without using a dedicated power measurement system (10). There is an advantage.

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

According to this aspect, it is possible to detect an error in the setting of the phase wire system or the connection points of the plurality of voltage input units (12a, 12b, 12c) without using a dedicated power measurement system (10). There is an advantage.

REFERENCE SIGNS LIST 100 power measuring device 10 power measuring system 11 voltage measurement unit 12a, 12b, 12c voltage input unit 141 processing unit 142 phase and wire system determination unit 143 phase and wire system setting unit 144 storage unit 145 fluctuation determination unit 146 correction information creation unit 17 notification unit 21 Presentation Unit 3 Case V (Vab, Vbc, Vca) Measured Voltage EC Target Circuit C1 Judgment 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 electrically connected to a circuit to be measured;
a phase and wire system setting unit that receives setting information from the outside and performs phase and wire system setting, which is a phase and wire system setting corresponding to the target circuit, based on the setting information;
A power measurement system, comprising: a phase-and-wire system determination unit that determines whether or not the measured voltage matches the phase-and-wire system setting. The target circuit is one of a plurality of candidate circuits with different phase wire systems,
further comprising a storage unit that stores information about the input voltage associated with each of the phase wire systems of the plurality of candidate circuits as a plurality of determination conditions;
The phase and wire system determination unit determines whether the measured voltage matches 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 electric power measurement system according to claim 1, characterized by: The power measurement system according to claim 2, wherein the plurality of determination conditions are conditions related to the magnitude of the measured voltage. The target circuit has a multi-wire electric circuit,
The voltage measurement unit measures each of the plurality of input voltages in the multi-wire electric circuit as the measurement voltage,
The electric power measurement system according to claim 2, wherein the plurality of determination conditions are conditions regarding phase differences between the plurality of input voltages. further comprising a variation 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 power measurement system according to any one of claims 1 to 4. 6. The variation determination unit determines that the input voltage is abnormal when the measured voltage continues to be out of the normal range for a predetermined time. A power metering system as described. The electric power measurement system according to any one of claims 1 to 4, further comprising a notification unit that notifies the determination result of the phase line system determination unit to the outside. The electric power measurement system according to claim 5 or 6, further comprising a notification unit that notifies the outside of at least one of the determination result of the phase line system determination unit and the fluctuation determination unit. When the phase and wire system determination unit determines that the measured voltage does not match the phase and wire system setting, corrective information is created that indicates means for eliminating the cause of the mismatch between the input voltage and the phase and wire system setting. a correction information creation department that
The power measurement system according to any one of claims 1 to 8, further comprising a presentation unit that presents the correction information. a current sensor that detects current flowing through the target circuit;
The power measurement system according to any one of claims 1 to 9, further comprising a processing unit that calculates power of the target circuit based on the measured voltage and the current. A power measurement system according to any one of claims 1 to 10;
A power measuring device comprising: a housing that houses the power measuring system. a voltage measurement step of measuring, as a measurement voltage, an input voltage applied between each of a plurality of voltage input units electrically connected to a circuit to be measured;
a phase and wire system setting step of receiving setting information from the outside and setting a phase and wire system corresponding to the target circuit based on the setting information;
and a voltage determination step of determining whether the measured voltage matches the phase line system setting. to the computer system,
For executing the power measurement method according to claim 12,
program.

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