Power sensor and power measurement method

Abstract

This invention provides a power sensor and power measurement method that can suppress the occurrence of situations where power values ​​are measured while a probe that does not match the characteristics of the object being measured is connected. [Solution] The power sensor measures the value of power supplied through a power line. The power sensor is equipped with a connection part. A probe that measures the signal necessary for calculating the power value is connected to the connection part. Multiple types of probes are prepared in advance, corresponding to the characteristics of the object to be measured by the probe. The power sensor further includes a reception unit, a determination unit, and a display unit. The reception unit receives characteristic information indicating the characteristics of the object to be measured by the probe from the user before measuring the power. The determination unit determines the above characteristics corresponding to the probe connected to the connection part. The display unit displays a warning screen according to the characteristic information input through the reception unit and the determination result by the determination unit.

Description

Technical Field

[0001] The present invention relates to a power sensor and a power measurement method.

Background Art

[0002] Japanese Patent Application Laid-Open No. 2015-1403 (Patent Document 1) discloses a power measurement device. This power measurement device includes a power measurement unit, a current measurement unit, and a voltage measurement unit. The power measurement unit measures the amount of power supplied to a device or the amount of power supplied from a device from the current measured by the current measurement unit and the voltage measured by the voltage measurement unit.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] For a power sensor that measures the value of power supplied through an electric wire (hereinafter, also referred to as "power value"), for example, a probe that measures a signal necessary for calculating the power value is connected. For example, a plurality of types of probes corresponding to the characteristics of the measurement object by the probe (for example, wiring method of the electric wire, current range or voltage range) are prepared in advance. By measuring the power value in a state where a probe suitable for the characteristics of the measurement object by the probe is connected to the power sensor, a highly accurate measurement result can be obtained. On the other hand, if the power value is measured in a state where a probe not suitable for the characteristics of the measurement object by the probe is connected to the power sensor, a highly accurate measurement result may not necessarily be obtained. Also, in such a case, a failure may occur in the power sensor or the probe. However, a solution to such a problem is not disclosed in the above Patent Document 1.

[0005] The present invention has been made to solve such problems, and its objective is to provide a power sensor and a power measurement method that can suppress the occurrence of situations in which power values ​​are measured when a probe that does not match the characteristics of the object to be measured is connected. [Means for solving the problem]

[0006] A power sensor according to a certain aspect of the present invention measures the value of power supplied through an electric wire. The power sensor includes a connection section. A probe that measures signals necessary for calculating the power value is connected to the connection section. Multiple types of probes are prepared in advance, corresponding to the characteristics of the object to be measured by the probe. The power sensor further includes a reception section, a determination section, and a display section. The reception section receives characteristic information indicating the characteristics of the object to be measured by the probe from the user before measuring the power. The determination section determines the above characteristics corresponding to the probe connected to the connection section. The display section displays a warning screen according to the characteristic information input through the reception section and the determination result by the determination section.

[0007] In this power sensor, a warning screen is displayed according to the characteristic information input through the reception unit and the judgment result from the judgment unit. Therefore, with this power sensor, a warning screen is displayed depending on the situation, which can prevent situations such as power values ​​being measured when a probe that does not match the characteristics of the object being measured is connected to the connection unit.

[0008] In the above-described power sensor, the display unit may display a warning screen if the features indicated by the feature information input through the reception unit differ at least partially from the features determined by the determination unit.

[0009] In this power sensor, a warning screen is displayed if the characteristics indicated by the feature information input through the reception unit differ at least partially from the characteristics determined by the determination unit. Therefore, with this power sensor, the user is notified via the warning screen if a probe that does not match the characteristics of the object being measured is connected to the connection unit, thus preventing situations in which power values ​​are measured while a probe that does not match the characteristics of the object being measured is connected to the connection unit.

[0010] In the above-described power sensor, the above-described features may include the wiring method of the electric wires.

[0011] The above-mentioned power sensor may further include a control unit that controls the measurement of the power value. The control unit may perform a process to start measuring the power value if the features indicated by the feature information input through the reception unit are the same as the features determined by the determination unit. However, if the features indicated by the feature information input through the reception unit are at least partially different from the features determined by the determination unit, the control unit does not need to perform a process to start measuring the power value.

[0012] In this power sensor, if the features indicated by the feature information input through the reception unit differ at least partially from the features determined by the determination unit, the process of starting power value measurement is not executed. Therefore, this power sensor makes it possible to avoid situations where power values ​​are measured when a probe that does not match the features of the object being measured is connected to the connection unit.

[0013] In the above-described power sensor, the connection portion may include a first connection portion and a second connection portion, and the probe may include a voltage probe that measures a signal relating to the voltage applied to the wire and a current probe that measures a signal relating to the current generated in the wire, and the voltage probe may be connected to the first connection portion and the current probe may be connected to the second connection portion.

[0014] A power measurement method according to another aspect of the present invention measures the value of power supplied through an electric wire. The power measurement method includes connecting a probe that measures signals necessary for calculating the value of power. Multiple types of probes are prepared in advance, corresponding to the characteristics of the object to be measured by the probe. The power measurement method further includes receiving characteristic information indicating the characteristics of the object to be measured by the probe from a user before measuring the power, determining the characteristics corresponding to the connected probe, and displaying a warning screen according to the determination result regarding the characteristics corresponding to the connected probe and the input characteristic information.

[0015] In this power measurement method, a warning screen is displayed according to the judgment result regarding the above-mentioned characteristics corresponding to the connected probe, and according to the input characteristic information. Therefore, with this power measurement method, a warning screen is displayed depending on the situation, so for example, it is possible to suppress situations in which power values ​​are measured when a probe that does not match the characteristics of the object being measured is connected. [Effects of the Invention]

[0016] According to the present invention, it is possible to provide a power sensor and a power measurement method that can suppress the occurrence of situations in which power values ​​are measured when a probe that does not match the characteristics of the object to be measured is connected. [Brief explanation of the drawing]

[0017] [Figure 1] This diagram schematically illustrates a power measurement system including a power sensor. [Figure 2] This is a block diagram schematically showing the electrical configuration of a power sensor. [Figure 3] This diagram schematically shows the first set of ID tables. [Figure 4] This diagram schematically shows the second set of ID tables. [Figure 5] This diagram shows a portion of the circuit formed between each probe and the power sensor when the current probe and voltage probe are connected to the power sensor. [Figure 6] It is a flowchart showing the procedure of the check operation for each probe connected to the power sensor. [Figure 7] It is a diagram schematically showing an example of a warning screen. [Figure 8] It is a diagram schematically showing the second ID table in other embodiments.

Embodiments for Carrying Out the Invention

[0018] Hereinafter, embodiments according to one aspect of the present invention (hereinafter also referred to as "the present embodiment") will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and their descriptions are not repeated. Also, for ease of understanding, each drawing is schematically drawn with appropriate omissions or exaggerations of the subject.

[0019] [1. Configuration of Power Measurement System] FIG. 1 is a diagram schematically showing a power measurement system 10 including a power sensor 100 according to the present embodiment. Referring to FIG. 1, the power measurement system 10 is configured to measure the value of the power (power value) supplied through an electric wire. The power measurement system 10 includes a power sensor 100, and the power sensor 100 is provided with a first connection portion 150 and a second connection portion 160.

[0020] A current probe 200 is connected to the first connection portion 150. A plug 210 is provided at one end of the current probe 200, and a fixing portion 220 is provided at the other end of the current probe 200. The plug 210 and the fixing portion 220 are connected to each other via a cable. In a state where the plug 210 is connected to the first connection portion 150 and the fixing portion 220 is fixed to the electric wire, a signal related to the current generated in the electric wire (hereinafter also referred to as "current signal") is detected, and the detected current signal is input to the power sensor 100.

[0021] A voltage probe 300 is connected to the second connection part 160. A plug 310 is provided at one end of the voltage probe 300, and a fixing part 320 is provided at the other end of the voltage probe 300. The plug 310 and the fixing part 320 are connected to each other via a cable. With the plug 310 connected to the second connection part 160 and the fixing part 320 fixed to the wire, a signal related to the voltage applied to the wire (hereinafter also referred to as the "voltage signal") is detected, and the detected voltage signal is input to the power sensor 100.

[0022] In the power sensor 100, the power value is measured based on the current signal input via the current probe 200 and the voltage signal input via the voltage probe 300. For example, the current value is calculated based on the current signal, and the voltage value is calculated based on the voltage signal. The power value is calculated by multiplying the current value and the voltage value. Once the power value is calculated, information indicating the measurement result of the power value is displayed on the power sensor 100's display 140 (described later).

[0023] In the power measurement system 10, there are, for example, "three-wire" and "two-wire" wiring systems for which current can be measured. The "three-wire" system includes three-phase three-wire and single-phase three-wire systems, and the "two-wire" system includes single-phase two-wire systems. In addition, there are, for example, 100A, 200A, 400A, and 600A for which current can be measured. The power measurement system 10 is equipped with a current probe group 20, which includes multiple current probes 200 corresponding to the characteristics of the object to be measured (for example, wiring system and current range). The characteristics of the object to be measured are represented, for example, by a combination of one or more parameters that constitute the characteristics. The wiring system and current range are examples of parameters. In this example, there are eight combinations of wiring systems (2 patterns) and current ranges (4 patterns), and the current probe group 20 includes current probes 200 for each combination. That is, the current probe group 20 includes eight types of current probes 200.

[0024] Furthermore, in the power measurement system 10, there are, for example, "three-wire" and "two-wire" wiring methods for measuring voltage. Also, there is, for example, a measurable voltage range of 100-400V. In the power measurement system 10, a voltage probe group 30 is prepared, and the voltage probe group 30 includes multiple voltage probes 300 according to the characteristics of the object to be measured (for example, wiring method and voltage range). The characteristics of the object to be measured are represented, for example, by a combination of one or more parameters that constitute the characteristics. The wiring method and voltage range are examples of parameters. In this example, there are two combinations of wiring methods (2 patterns) and voltage ranges (1 pattern), and the voltage probe group 30 includes voltage probes 300 for each combination. That is, the voltage probe group 30 includes two types of voltage probes 300.

[0025] When a current probe 200 that matches the characteristics of the object being measured is connected to the first connection part 150, a current signal is detected, resulting in highly accurate detection results for the current signal. Similarly, when a voltage probe 300 that matches the characteristics of the object being measured is connected to the second connection part 160, a voltage signal is detected, resulting in highly accurate detection results for the voltage signal. By obtaining highly accurate detection results for both the current signal and the voltage signal, highly accurate measurement results for the power value can be obtained. On the other hand, if a probe that does not match the characteristics of the object being measured (current probe 200 or voltage probe 300) is connected to the power sensor 100 and the power value is measured, highly accurate measurement results cannot necessarily be obtained. Furthermore, in such cases, a malfunction may occur in the power sensor 100 or each probe.

[0026] In the power sensor 100 according to this embodiment, measures are taken to prevent power value measurement from being performed when a probe that does not match the characteristics of the object to be measured is connected to the first connection part 150 or the second connection part 160. The configuration and operation of the power sensor 100 will be described in detail below.

[0027] [2. Power Sensor Configuration] Figure 2 is a schematic block diagram showing the electrical configuration of the power sensor 100. As shown in Figure 2, the power sensor 100 includes a control unit 110, an operating unit 130, a display 140, a first connection unit 150, and a second connection unit 160.

[0028] The control unit 110 includes a CPU (Central Processing Unit), RAM (Random Access Memory), and ROM (Read Only Memory), and is configured to control each component according to information processing. The operation unit 130 is configured to receive input from the user. The operation unit 130 is composed of, for example, a touch panel and some or all of various switches. The display 140 is configured to display images. The display 140 is composed of, for example, a liquid crystal monitor or an organic EL (Electro Luminescence) monitor.

[0029] As described above, the first connection section 150 is configured to which the current probe 200 is connected. The current signal detected by the current probe 200 is input to the control unit 110 via the first connection section 150. As described above, the second connection section 160 is configured to which the voltage probe 300 is connected. The voltage signal detected by the voltage probe 300 is input to the control unit 110 via the second connection section 160.

[0030] The storage unit 120 is, for example, an auxiliary storage device such as a hard disk drive or a solid-state drive. The storage unit 120 stores, for example, a control program 122, a first ID (identification) table group 123, and a second ID table group 124. The various functions of the power sensor 100 are realized when the control program 122 is executed by the CPU of the control unit 110.

[0031] In the power sensor 100, before measuring the power value, information indicating the characteristics of the object to be measured (hereinafter also referred to as "characteristic information") is input by the user via the operation unit 130. For example, the user inputs information regarding the wiring method, current range, and voltage range of the wire to be measured via the operation unit 130 before measuring the power value. As will be described in detail later, a first ID is assigned to each of the current probe 200 and voltage probe 300 connected to the power sensor 100 according to the input content. The power sensor 100 also has a function (hereinafter also referred to as "determination function") that determines which characteristic application of the object to be measured each of the connected current probe 200 and voltage probe 300 is for. A second ID is assigned to each of the current probe 200 and voltage probe 300 connected to the power sensor 100 according to the determination result. In the power sensor 100, by comparing the first ID and second ID assigned to the current probe 200 and the voltage probe 300, respectively, it is determined whether a probe matching the characteristics of the object to be measured is connected to the first connection part 150 and the second connection part 160.

[0032] Figure 3 is a schematic diagram of the first ID table group 123. As shown in Figure 3, the first ID table group 123 includes the first ID table T11 and the first ID table T12. In the first ID table T11, the wiring method, current range, and first ID are managed in association with each other. In the power sensor 100, the first ID is assigned to the current probe 200 connected to the first connection part 150 based on the input content regarding the characteristic information and the first ID table T11. For example, if "three-wire" is input as the wiring method and "200A" is input as the current range, "2" is assigned as the first ID to the current probe 200 connected to the first connection part 150.

[0033] In the first ID table T12, the wiring method, voltage range, and first ID are managed in association with each other. In the power sensor 100, the first ID is assigned to the voltage probe 300 connected to the second connection part 160 based on the input content regarding the characteristic information and the first ID table T12. For example, if "three-wire" is input as the wiring method and "100V" is input as the voltage range, then "0" is assigned as the first ID to the voltage probe 300 connected to the second connection part 160.

[0034] Figure 4 is a schematic diagram of the second ID table group 124. As shown in Figure 4, the second ID table group 124 includes the second ID table T21 and the second ID table T22. In the second ID table T21, the wiring method, current range, identification resistance, input voltage, and second ID are managed in correspondence with each other.

[0035] Figure 5 shows a portion of the circuit formed between each probe and the power sensor 100 when the current probe 200 and voltage probe 300 are connected to the power sensor 100. Referring to Figure 5, an identification resistor RE2 is included in each probe connected to the power sensor 100. Each type of probe contains an identification resistor RE2 with a different resistance value than other types of probes. In the power measurement system 10, each of the eight types of current probes 200 and the two types of voltage probes 300 contains an identification resistor RE2 with a different resistance value than other types of probes. Components other than the identification resistor RE2 are included in the power sensor 100.

[0036] A resistor RE1 and an identification resistor RE2 are provided between the power supply VA1 and the ground. An operation unit 130 and a control unit 110 are connected between the resistor RE1 and the identification resistor RE2. The on and off states of the determination function are switched by the operation unit 130. When the determination function is in the on state, the connection between the power supply VA1 and the connection point P1 is in a conductive state. On the other hand, when the determination function is in the off state, the connection between the power supply VA1 and the connection point P1 is in a non-conductive state. When the determination function is in the on state, the voltage across the identification resistor RE2 is input to the control unit 110. Since the resistance value of the identification resistor RE2 is different for each type of probe as described above, the control unit 110 can determine the type of probe connected to the power sensor 100 based on the input voltage (hereinafter also referred to as "input voltage").

[0037] Referring again to FIG. 4, in the power sensor 100, a second ID is assigned to the current probe 200 connected to the first connection portion 150 based on the input voltage through the circuit formed by the current probe 200 and the power sensor 100 and the second ID table T21. For example, when V4 - a4 < input voltage < V4 + a4, "3" is assigned to the current probe 200 as the second ID.

[0038] In the second ID table T22, the wiring method, the identification resistor, the input voltage, and the second ID are managed in association with each other. In the power sensor 100, a second ID is assigned to the voltage probe 300 connected to the second connection portion 160 based on the input voltage through the circuit formed by the voltage probe 300 and the power sensor 100 and the second ID table T22. For example, when V10 - a10 < input voltage < V10 + a10, "1" is assigned to the voltage probe 300 as the second ID.

[0039] [3. Check operation regarding connected probes] Figure 6 is a flowchart showing the procedure for checking each probe connected to the power sensor 100. The process shown in this flowchart is executed by the control unit 110 with the current probe 200 and voltage probe 300 connected to the first connection part 150 and the second connection part 160, respectively.

[0040] Referring to Figure 6, the control unit 110 determines whether or not the user has completed inputting the feature information via the operation unit 130 (step S100). If it is determined that the input of the feature information is not complete (NO in step S100), the control unit 110 waits until the input of the feature information is complete.

[0041] On the other hand, when it is determined that the input of feature information is complete (YES in step S100), the control unit 110 assigns a first ID to each probe based on the input content related to the feature information and the first ID table group 123 (step S110). Specifically, the control unit 110 assigns a first ID to the current probe 200 connected to the first connection unit 150 based on the input content related to the wiring method and current range and the first ID table T11. The control unit 110 also assigns a first ID to the voltage probe 300 connected to the second connection unit 160 based on the input content related to the wiring method and voltage range and the first ID table T12.

[0042] The control unit 110 measures the input voltage through each circuit formed by each probe and the power sensor 100 (step S120). Specifically, the control unit 110 measures the input voltage through the circuit formed by the current probe 200 and the power sensor 100, and the input voltage through the circuit formed by the voltage probe 300 and the power sensor 100.

[0043] The control unit 110 assigns a second ID to each probe based on the input voltage through each circuit formed by each probe and the power sensor 100 and the second ID table group 124 (step S130). Specifically, the control unit 110 assigns a second ID to the current probe 200 connected to the first connection unit 150 based on the input voltage through the circuit formed by the current probe 200 and the power sensor 100 and the second ID table T21. The control unit 110 also assigns a second ID to the voltage probe 300 connected to the second connection unit 160 based on the input voltage through the circuit formed by the voltage probe 300 and the power sensor 100 and the second ID table T22.

[0044] The control unit 110 determines whether the assigned first ID and second ID for each probe match (step S140). Specifically, the control unit 110 determines whether the assigned first ID and second ID for the current probe 200 match, and whether the assigned first ID and second ID for the voltage probe 300 match. If it is determined that the first ID and second ID match for each probe (YES in step S140), the control unit 110 executes a process to start measuring the power value (step S150). On the other hand, if it is determined that the assigned first ID and second ID do not match for any of the probes (NO in step S140), the control unit 110 does not execute a process to start measuring the power value, but controls the display 140 to display a warning screen (step S160).

[0045] Figure 7 is a schematic diagram showing an example of a warning screen. Referring to Figure 7, the display 140 shows a warning screen. On this warning screen, for each probe, the input characteristic information and the judgment result regarding the characteristics corresponding to the connected probe are displayed. In this example, information about the voltage probe 300 is displayed as information IF1, and information about the current probe 200 is displayed as information IF2.

[0046] For both the voltage probe 300 and the current probe 200, "2W" indicates a two-wire wiring system, and "3W" indicates a three-wire wiring system. For the current probe 200, "1" indicates a current range of 100A, "2" indicates a current range of 200A, "4" indicates a current range of 400A, and "6" indicates a current range of 600A.

[0047] In both Information IF1 and Information IF2, the value on the left indicates the input feature information, and the value on the right indicates the judgment result regarding the feature corresponding to the connected probe. For the voltage probe 300, the input feature information is "two-wire," while the judgment result is "three-wire." For the current probe 200, the input feature information is "100A" and "two-wire," and the judgment result is "100A" and "two-wire." Information IF3 indicates whether the input feature information and the judgment result match. "OK" indicates a match, and "NG" indicates a mismatch. For the voltage probe 300, "NG" is displayed because the input feature information and the judgment result do not match. On the other hand, for the current probe 200, "OK" is displayed because the input feature information and the judgment result match. By referring to this warning screen, the user can recognize that the wrong voltage probe 300 is connected to the second connection part 160.

[0048] [4. Features] As described above, in the power sensor 100 according to this embodiment, a warning screen is displayed according to the characteristic information input through the operation unit 130 and the determination result by the control unit 110. Therefore, with the power sensor 100, a warning screen is displayed according to the situation, so for example, it is possible to suppress the occurrence of a situation in which a power value is measured when a probe that does not match the characteristics of the object to be measured is connected to the first connection unit 150 or the second connection unit 160.

[0049] Furthermore, in the power sensor 100 according to this embodiment, a warning screen is displayed if the features indicated by the feature information input through the operation unit 130 differ at least partially from the features determined by the control unit 110. Therefore, with the power sensor 100, the user is notified via the warning screen if a probe that does not match the features of the object to be measured is connected to the first connection unit 150 or the second connection unit 160, thereby suppressing the occurrence of situations where power values ​​are measured while a probe that does not match the features of the object to be measured is connected to the first connection unit 150 or the second connection unit 160.

[0050] Furthermore, in the power sensor 100 according to this embodiment, if the features indicated by the feature information input through the operation unit 130 and the features determined by the control unit 110 differ at least partially, the process of starting the measurement of the power value is not executed. Therefore, the power sensor 100 makes it possible to avoid situations in which the power value is measured while a probe that does not match the features of the object to be measured is connected to the first connection unit 150 or the second connection unit 160.

[0051] [5. Other Embodiments] The concept of the above embodiment is not limited to the embodiment described above. Below, an example of another embodiment to which the concept of the above embodiment can be applied will be described.

[0052] <5-1> In the above embodiment, a second ID was associated with each input voltage corresponding to each type of current probe 200 in the second ID table T21. However, second IDs may also be associated with input voltages other than those corresponding to each type of current probe 200. For example, a second ID may be associated with input voltages close to the voltage value of the power supply VA1 (Open state) and input voltages close to 0V (Short state). Furthermore, a second ID may also be associated with input voltages of other voltage values ​​(Fault state).

[0053] Figure 8 is a schematic diagram showing the second ID table T21A in another embodiment. As shown in Figure 8, in the second ID table T21A, a second ID is associated with each of the Open state, Short state, and fault state. In this case, the control unit 110 can determine which type of current probe 200 is connected, or whether it is in an Open state, Short state, or fault state, based on the input voltage through the circuit formed by the current probe 200 and the power sensor 100. These determination results may be displayed on the display 140, for example, in a warning screen.

[0054] <5-2> In the above embodiment, a warning screen was displayed on the display 140 if the first ID and second ID did not match in either the current probe 200 or the voltage probe 300. On the other hand, if the first ID and second ID matched in both the current probe 200 and the voltage probe 300, no screen was displayed on the display 140, and power measurement was started. However, if the first ID and second ID matched in both the current probe 200 and the voltage probe 300, a screen indicating that there were no problems with each connected probe may be displayed on the display 140.

[0055] <5-3> In the above embodiment, each voltage probe 300 corresponds to a voltage range of 100-400V, and the first ID and second ID were not associated with each voltage range. However, it is not necessary for each voltage probe 300 to correspond to a voltage range of 100-400V. In this case, the first ID and second ID may be associated with each voltage range in the first ID table T12 and the second ID table T22, respectively.

[0056] <5-4> In the above embodiment, the first ID and second ID are associated with each current range in the first ID table T11 and the second ID table T21, respectively. However, if, for example, each current probe 200 corresponds to a current range of 100-600A, it is not necessarily required that the first ID and second ID be associated with each current range.

[0057] <5-5> In the above embodiment, no particular distinction was made between a three-phase three-wire system and a single-phase three-wire system with respect to the wiring method. However, different first IDs and second IDs may be assigned to the three-phase three-wire system and the single-phase three-wire system, and the current probe 200 and voltage probe 300 for the three-phase three-wire system and the current probe 200 and voltage probe 300 for the single-phase three-wire system may be distinguished from each other.

[0058] Embodiments of the present invention have been described illustratively above. That is, a detailed description and accompanying drawings have been disclosed for illustrative purposes. Therefore, some of the components described in the detailed description and accompanying drawings may not be essential for solving the problem. Consequently, the mere fact that these non-essential components are described in the detailed description and accompanying drawings does not mean that they should be immediately assumed to be essential.

[0059] Furthermore, the above embodiments are merely illustrative in every respect of the present invention. The above embodiments can be improved or modified in various ways within the scope of the present invention. For example, at least a part of the configuration of one embodiment may be combined with at least a part of the configuration of any other embodiment. In other words, in carrying out the present invention, specific configurations can be appropriately adopted depending on the embodiment. [Explanation of Symbols]

[0060] 10 Power measurement system, 20 Current probe group, 30 Voltage probe group, 100 Power sensor, 110 Control unit (microcontroller), 120 Memory unit, 122 Control program, 123 First ID table group, 124 Second ID table group, 130 Operation unit, 140 Display, 150 First connection unit, 160 Second connection unit, 200 Current probe, 210, 310 Plug, 220, 320 Fixing unit, 300 Voltage probe, IF1, IF2, IF3 Information, P1 Connection point, RE1 Resistor, RE2 Identification resistor, VA1 Power supply, T11, T12 First ID table, T21, T21A, T22 Second ID table.

Claims

1. A power sensor that measures the value of power supplied through an electric wire, It includes a connection section to which a probe is connected that measures the signal necessary for calculating the value of the aforementioned power, Multiple types of probes are prepared in advance, corresponding to the characteristics of the object to be measured by the aforementioned probe. A reception unit that receives input of characteristic information indicating the aforementioned characteristics from the user before measuring the aforementioned power, A determination unit for determining the characteristics corresponding to the probe connected to the connection part, A power sensor further comprising a display unit that displays a warning screen according to the characteristic information input through the reception unit and the determination result by the determination unit.

2. The power sensor according to claim 1, wherein the display unit displays the warning screen when the features indicated by the feature information input through the reception unit differ at least partially from the features determined by the determination unit.

3. The power sensor according to claim 1 or claim 2, wherein the aforementioned feature includes the wiring method for the electric wires.

4. The system further includes a control unit that controls the measurement of the power value, The control unit, If the characteristic information input through the reception unit is identical to the characteristic determined by the determination unit, the process of starting the measurement of the power value is executed. The power sensor according to claim 1 or 2, wherein if the features indicated by the feature information input through the reception unit differ at least partially from the features determined by the determination unit, the process of starting the measurement of the power value is not executed.

5. The aforementioned connection includes a first connection and a second connection, The probe includes a voltage probe that measures a signal relating to the voltage applied to the wire and a current probe that measures a signal relating to the current occurring in the wire. The voltage probe is connected to the first connection part. The power sensor according to claim 1 or claim 2, wherein the current probe is connected to the second connection portion.

6. A power measurement method for measuring the value of power supplied through an electric wire, This includes connecting a probe that measures the signal necessary for calculating the value of the aforementioned power, Multiple types of probes are prepared in advance, corresponding to the characteristics of the object to be measured by the aforementioned probe. Before measuring the aforementioned power, the system accepts input of characteristic information indicating the aforementioned characteristics from the user, Determining the characteristics corresponding to the connected probe, A power measurement method further comprising determining the characteristics corresponding to the connected probe, and displaying a warning screen in accordance with the input characteristic information.

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