Electronic indicating instrument and setting system for electronic indicating instrument

Abstract

The electronic indicating instrument (3) includes an NFC communication antenna (17) that communicates with a portable terminal (20) equipped with a short-range wireless communication function and receives power by electromagnetic induction from radio waves emitted by the portable terminal (20), a setting value memory unit (12) that stores setting values ​​including a phase line type, a VT ratio, and a CT ratio, an NFC communication control unit (16) that operates using power received by the NFC communication antenna (17) and receives the setting values ​​from the portable terminal (20), and a control device (8) that stores the setting values ​​received by the NFC communication control unit (16) in the setting value memory unit (12).

Description

[Technical field]

[0001] The present disclosure relates to an electronic indicating instrument that indicates a measured electrical quantity and a setting system for the electronic indicating instrument. [Background technology]

[0002] Electronic indicating instruments indicate and display various measured electrical quantities. Electronic indicating instruments are equipped with a display unit that displays the measurement values ​​and settings calculated using the current and voltage input from the electrical circuit.

[0003] Patent Document 1 discloses an indicating instrument having a power supply unit that generates operating power from AC power input to a power supply control terminal, a measurement processing unit that measures and processes a plurality of signals from various sensors, and a display / setting unit that has a function of displaying signals from the measurement processing unit and a function of setting various parameters to the measurement processing unit. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2000-329589 A Summary of the Invention [Problem to be solved by the invention]

[0005] In Patent Document 1, in order to set various parameters in the measurement processing unit, it is necessary to supply operating power from the power supply unit. In a situation where AC power is not supplied to the power supply unit, such as in a factory where an indicating instrument is mounted on a panel and wiring work is performed, it is difficult to pull a power line into this panel, and there is a problem that it is not possible to set various parameters unless a separate dedicated power supply is prepared.

[0006] The present disclosure has been made in consideration of the above, and has an object to provide an electronic indicating instrument that allows setting of various parameters without a power supply. [Means for solving the problem]

[0007] In order to solve the above-mentioned problems and achieve the object, the electronic indicating instrument of the present disclosure includes an antenna unit that communicates with a portable terminal equipped with a short-range wireless communication function and receives power by electromagnetic induction from radio waves emitted by the portable terminal, a setting value storage unit that stores setting values ​​including a phase line system, a VT ratio, and a CT ratio, and an NFC communication control unit that operates using the power received by the antenna unit and receives the setting values ​​from the portable terminal, an NFC communication storage unit that operates using the power received by the antenna unit and stores the setting values ​​received by the NFC communication control unit; Set the value Use it to measure and calculate various electrical quantities A control device. The control device saves the setting values ​​stored in the NFC communication storage unit in the setting value storage unit. Effect of the Invention

[0008] The electronic indicating instrument of the present disclosure has the advantage that it is possible to perform setting work without a power supply. [Brief description of the drawings]

[0009] [Figure 1] A block diagram showing the configuration of an electronic indicating instrument according to the first embodiment. [Diagram 2] FIG. 1 is a table showing main settings of an electronic indicating instrument according to the first embodiment. [Diagram 3] A flowchart showing the operation at the time of starting up the electronic indicating instrument in the first embodiment. [Figure 4] A flowchart showing the operation of the electronic indicating instrument in the first embodiment when changing settings by an operation other than NFC communication. [Diagram 5] A block diagram showing the configuration of an electronic indicating instrument in a second embodiment. [Figure 6] A flowchart showing the operation of an electronic indicating instrument in the second embodiment. [Figure 7] A configuration diagram showing a setting system for an electronic indicating instrument in embodiment 3. [Figure 8] FIG. 13 is a configuration diagram showing a setting system for an electronic indicating instrument according to a fourth embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] An electronic indicating instrument and a setting system for an electronic indicating instrument according to an embodiment will be described in detail below with reference to the drawings.

[0011] Embodiment 1 An electronic indicating instrument in the first embodiment will be described. FIG. 1 is a block diagram showing the configuration of an electronic indicating instrument 3 in the first embodiment. The electronic indicating instrument 3 has a function of indicating and displaying various measured electrical quantities. As shown in FIG. 1, the electronic indicating instrument 3 includes a voltage measuring circuit 4, a current measuring circuit 5, a power supply circuit 6, a control device 8, an operation unit 21, a communication unit 22, a display unit 23, a display control unit 24, an NFC (Near Field Communication) communication antenna 17, an NFC communication control device 14, and an NFC communication power supply unit 18. An electric circuit 1 to be measured by the electronic indicating instrument 3 is connected to an AC power supply 2. A current transformer (CT) 30 and a voltage transformer (VT) 35 are provided in the electric circuit 1. The current transformer 30 converts the current flowing through the electric circuit 1 into a measurement current. The voltage transformer 35 converts the voltage of the electric circuit 1 into a measurement voltage.

[0012] The voltage measurement circuit 4 measures the line voltage of the electric circuit 1 to be measured using the output of the transformer 35. The current measurement circuit 5 inputs a current signal detected by a current transformer 30 provided on the electric circuit 1. The power supply circuit 6 is connected to an auxiliary power supply 7 and generates an internal power supply 6a for operating the electronic indicating instrument 3. The control device 8 measures and calculates various electric quantities. The operation unit 21 performs setting operations and switching of the display contents of the display unit 23. The communication unit 22 transmits the various electric quantities measured by the control device 8 to other devices via a network such as a field network different from NFC communication. The display control unit 24 controls the display of various electric quantities on the display unit 23. The display unit 23 displays measurement values, setting contents, etc.

[0013] NFC communication is a short-distance wireless communication capable of transmitting power. The NFC communication antenna 17 receives power by electromagnetic induction from radio waves emitted by a mobile terminal 20 such as a smartphone, tablet, or notebook computer. The NFC communication power supply unit 18 generates an NFC communication power supply 19, which is an operating power source for the NFC communication control device 14, from the power received by the NFC communication antenna 17. The NFC communication control device 14 has an NFC communication storage unit 15 and an NFC communication control unit 16. The NFC communication control device 14 operates using the power received by the NFC communication antenna 17, stores setting values ​​including a phase line system, a VT ratio, a CT ratio, and the like, and communicates with the mobile terminal 20.

[0014] The control device 8 includes an A / D (Analog to Digital) conversion circuit 9, a measurement value calculation unit 10, a control unit 11, a set value storage unit 12, and a set value comparison unit 13. The A / D conversion circuit 9 converts an analog voltage signal from the voltage measurement circuit 4 and an analog current signal from the current measurement circuit 5 into a digital voltage signal and a digital current signal, respectively. The measurement value calculation unit 10 calculates electrical quantities such as current, voltage, power, and power energy using the digital voltage signal and digital current signal converted by the A / D conversion circuit 9, a phase line system indicating a power distribution method of the electric circuit 1 to be measured that has been set in advance, and rated information of the transformer 35 and rated information of the current transformer 30. The control unit 11 controls the operation unit 21, the communication unit 22, the display control unit 24, and the NFC communication control device 14. The set value storage unit 12 stores set values ​​including a phase line system, a VT ratio, a CT ratio, and the like. The set value comparison unit 13 compares the set value data stored in the set value storage unit 12 with the set value data stored in the NFC communication control unit 14 to determine whether they match.

[0015] The NFC communication storage unit 15 of the NFC communication control device 14 operates using power received by the NFC communication antenna 17, and stores setting value data received from the mobile terminal 20. The NFC communication control unit 16 operates using power received by the NFC communication antenna 17, and controls communication with the mobile terminal 20 and with the control device 8.

[0016] FIG. 2 is a diagram showing a list of main settings in the electronic indicating instrument 3 in the first embodiment. The main setting items required for measurement include the phase line system indicating the power distribution system of the electric circuit 1, the VT secondary voltage and VT primary voltage which are the rated information of the transformer 35, and the CT secondary current and CT primary current which are the rated information of the current transformer 30. The VT ratio corresponds to the VT secondary voltage and the VT primary voltage, and the CT ratio corresponds to the CT secondary current and the CT primary current. These setting items must be set in advance in the electronic indicating instrument 3. If the setting is not performed or if there is an error in the setting, an error occurs in the calculation in the measurement value calculation unit 10, and correct measurement cannot be performed. There are several other setting items including communication settings with a higher-level device and alarm output.

[0017] Generally, the electronic indicating instrument 3 is set using an operation unit 21 mounted on the front of the electronic indicating instrument 3. The operation unit 21 has a push button structure, and the contents set by operating the buttons on the operation unit 21 are registered in the set value storage unit 12 via the control unit 11 and the set value comparison unit 13. Similarly, it is also possible to set the contents from a higher-level device via the communication unit 22.

[0018] The electronic indicating instrument 3 is driven by an internal power supply 6a for the electronic indicating instrument 3, which is generated by a power supply circuit 6 connected to an auxiliary power supply 7. Therefore, when setting is performed from the operation unit 21 or the communication unit 22, the auxiliary power supply 7 for the electronic indicating instrument 3 is required in either case.

[0019] As shown in Fig. 1, the electronic indicating instrument 3 is equipped with an NFC communication antenna 17 for NFC communication, which is a type of short-range wireless communication function. The NFC communication antenna 17 is an antenna used for NFC communication with a mobile terminal 20. The mobile terminal 20 also has a built-in NFC communication antenna, and NFC communication can be performed between the electronic indicating instrument 3 and the mobile terminal 20 by using the NFC communication function.

[0020] In the electronic indicating instrument 3, the settings can be changed using NFC communication even when the auxiliary power supply 7 is not connected. An application dedicated to setting the electronic indicating instrument 3 is installed in advance on the mobile terminal 20, and the main body settings of the electronic indicating instrument 3, such as the phase line type, the rating information of the current transformer 30, and the rating information of the transformer 35, are performed within the application. After completing the settings within the application, the mobile terminal 20 is brought close to the NFC communication antenna 17 of the electronic indicating instrument 3, whereby the setting values ​​set in the application are transmitted to the NFC communication memory unit 15 via the NFC communication control unit 16 and stored.

[0021] 3 is a flowchart showing the operation at the time of start-up of the electronic indicating instrument 3 in embodiment 1. In step S101, the setting values ​​stored in the setting value storage unit 12 are read, and the NFC communication control unit 16 reads the setting values ​​stored in the NFC communication storage unit 15.

[0022] In the next step S102, the set value comparison unit 13 compares the set value in the set value storage unit 12 with the set value in the NFC communication storage unit 15. If the comparison results in a match and the set value has not been changed, the procedure proceeds to step S104. If the comparison results in a mismatch and the set value has been changed, the procedure proceeds to step S103.

[0023] In step S103, control unit 11 reflects the setting value of NFC communication storage unit 15 in the setting value storage unit 12, and proceeds to step S104. In step S104, control unit 11 adopts the setting value of setting value storage unit 12 as the setting value for performing measurement calculation again. In step S105, control unit 11 causes measurement value calculation unit 10 to perform measurement calculation processing using the setting value adopted in step S104, and causes display unit 23 to display the result of the measurement calculation processing.

[0024] The electronic indicating instrument 3 is designed to periodically perform the process shown in Fig. 3 on the assumption that settings are changed through NFC communication not only at startup but also in a normal powered state. If the process shown in Fig. 3 is not periodically performed, when settings are changed through NFC communication, the NFC communication control unit 16 may instruct the control unit 11 and the set value comparison unit 13 to perform the process shown in Fig. 3.

[0025] In the electronic indicating instrument 3, in addition to changing settings via NFC communication, settings can also be changed from the operation unit 21 or communication unit 22 mounted on the front of the main body. Figure 4 is a flowchart showing the operation of the electronic indicating instrument 3 in embodiment 1 when changing settings through an operation other than NFC communication. When changing settings through a method other than NFC communication, the internal power supply 6a of the electronic indicating instrument 3 must be supplied, so settings cannot be changed when the power is off.

[0026] As shown in FIG. 4, in step S201, it is determined whether or not a setting change has been made from the operation unit 21 or the communication unit 22. If a setting change has been made, the procedure proceeds to step S202, and if a setting change has not been made, the procedure proceeds to step S207. In step S202, in order to prevent a setting change through NFC communication during the setting change, the control unit 11 notifies the NFC communication control unit 16 that a setting change is being made. In the next step S203, the NFC communication control unit 16, which has received the notification from the control unit 11 that a setting change is being made, transitions to a state in which the NFC communication from the mobile terminal 20 is blocked. As a result, even if a request for NFC communication is made from the mobile terminal 20 during the setting change from the operation unit 21 or the communication unit 22, the NFC communication control unit 16 does not respond.

[0027] In the next step S204, after the setting from the operation unit 21 or the communication unit 22, the changed setting contents are reflected (stored) in the setting value storage unit 12 and the NFC communication storage unit 15, and the process proceeds to the next step S205. In step S205, since the setting change is complete, the control unit 11 notifies the NFC communication control unit 16 of the end of the setting change.

[0028] In the next step S206, since NFC communication control unit 16 has received a notification from control unit 11 that the setting change has been completed, it cancels the state in which communication from mobile terminal 20 is blocked, and the procedure proceeds to step S207. In step S207, control unit 11 causes measurement and calculation processing based on the changed settings to be performed, and causes display unit 23 to display the result of the measurement and calculation processing.

[0029] In the setting using the NFC communication function, power is supplied from the mobile terminal 20. During NFC communication, a magnetic field is generated from the mobile terminal 20 to the NFC communication antenna 17, which is converted into the NFC communication power supply 19 by the NFC communication power supply unit 18 and supplied to the NFC communication control device 14. The NFC communication control device 14 can be driven by either the internal power supply 6a or the NFC communication power supply 19. Therefore, the NFC communication control device 14 can be driven by the internal power supply 6a during operation of the electronic indicating instrument 3 in which the auxiliary power supply 7 is applied, and can be driven by the NFC communication power supply 19 during NFC communication. This makes it possible to perform setting by NFC communication even when there is no input from the auxiliary power supply 7 of the electronic indicating instrument 3, unlike when setting is performed from the operation unit 21 and communication unit 22.

[0030] Next, the reading of the setting value by the mobile terminal 20 will be described. The mobile terminal 20 can also read the setting value stored in the main body of the electronic indicating instrument 3 by using an application for the electronic indicating instrument 3. As in the case of changing the setting, by bringing the mobile terminal 20 close to the main body of the electronic indicating instrument 3, the NFC communication signal transmitted from the mobile terminal 20 is transmitted to the NFC communication control unit 16 via the NFC communication antenna 17. The NFC communication control unit 16 responds to the communication contents contained in the received NFC communication signal, acquires the current setting value data from the NFC communication storage unit 15, and transmits it to the mobile terminal 20 via the NFC communication antenna 17. By outputting the setting value data received by the mobile terminal 20 on the screen of the mobile terminal 20, the user can check the setting information of the electronic indicating instrument 3 on the mobile terminal 20 without operating the operation unit 21 of the main body of the electronic indicating instrument 3. The read setting contents can also be saved as electronic data in the mobile terminal 20, and can be used as a record of the setting contents of the electronic indicating instrument 3 that were previously set.

[0031] Furthermore, when a setting change is made by NFC communication using the mobile terminal 20, the setting is reflected immediately if the electronic indicating instrument 3 is running. When the setting is reflected, information including the phase line setting information, which is part of the setting contents, the VT secondary voltage and VT primary voltage, which are rated information of the transformer 35, and the CT secondary current and CT primary current, which are rated information of the current transformer 30, are displayed on the display unit 23. This notifies the user that the setting has been changed successfully.

[0032] According to the first embodiment, the electronic indicating instrument 3 includes an NFC communication antenna 17 that communicates with a mobile terminal 20 equipped with a short-range wireless communication function and receives power by electromagnetic induction from radio waves emitted by the mobile terminal 20, a set value storage unit 12 that stores set values ​​including a phase line system, a VT ratio, and a CT ratio, an NFC communication control unit 16 that operates with the power received by the NFC communication antenna 17 and receives set values ​​from the mobile terminal 20, an NFC communication storage unit 15 that operates with the power received by the NFC communication antenna 17 and stores the set values ​​received by the NFC communication control unit 16, and a control device 8 that stores the set values ​​stored in the NFC communication storage unit 15 in the set value storage unit 12, so that the set values ​​can be set without supplying power to the electronic indicating instrument 3. Also, the set values ​​can be set without using a setting code table, making the setting work more efficient.

[0033] In addition, the device is equipped with a communication unit 22 and an operation unit 21 that can set a setting value, and when a setting value is set in the setting value memory unit 12 by the communication unit 22 or the operation unit 21, the control unit 11 also reflects the setting value in the NFC communication memory unit 15 and makes it possible to transmit the setting value to the mobile terminal 20, so that the setting value can also be confirmed on the mobile terminal 20.

[0034] Embodiment 2 In the first embodiment, only setting values ​​were handled by NFC communication, but in the second embodiment, measurement values ​​such as power amounts can also be acquired by NFC communication from the mobile terminal 20. Figure 5 is a block diagram showing the configuration of an electronic indicating instrument 3A in the second embodiment.

[0035] As shown in FIG. 5, the electronic indicating instrument 3A is provided with a power failure detection unit 25. Other configurations are the same as those in the first embodiment, so duplicated explanations will be omitted. The power failure detection unit 25 receives a digital signal of the line voltage of the electric circuit 1 converted by the A / D conversion circuit 9. The power failure detection unit 25 detects a power failure of the electric circuit 1 based on the digital signal of the line voltage, and outputs a power failure detection signal to the control unit 11. Note that the power failure detection of the electric circuit 1 is not limited to being performed using the A / D conversion circuit 9. The power failure detection of the electric circuit 1 may be performed by the power supply circuit 6, and the detection signal may be input to the control unit 11.

[0036] Next, an operation that enables transmission of a measurement value by NFC communication will be described. Fig. 6 is a flow chart showing the operation of the electronic indicating instrument 3A in the second embodiment. As shown in Fig. 6, in step S301, the power outage detection unit 25 constantly monitors the digital signal of the line voltage of the electric circuit 1 converted by the A / D conversion circuit 9, and detects whether or not a power outage has occurred. If a power outage is detected, the procedure proceeds to step S302, and if a power outage is not detected, power outage detection continues.

[0037] In step S302, the control unit 11 receives a power outage detection signal from the power outage detection unit 25, reads the latest measurement value from the set value storage unit 12, and transmits it to the NFC communication control unit 16. The control unit 11 also instructs the NFC communication control unit 16 to store the transmitted measurement value in the NFC communication storage unit 15. In the next step S303, the NFC communication control unit 16, which has received an instruction from the control unit 11, stores the received measurement value in the NFC communication storage unit 15, and ends the process.

[0038] When a power outage occurs in this way, the latest measurement value is stored in the NFC communication storage unit 15, so that even during a power outage, the mobile terminal 20 can read the measurement value immediately before the power outage from the electronic indicating instrument 3A and display the measurement value on the display unit of the mobile terminal 20. Note that the measurement values ​​are stored in the NFC communication storage unit 15 during a power outage, including electrical quantities such as current, voltage, power, and power energy, as well as maximum values ​​of current, voltage, and power. Furthermore, the maximum values ​​of current, voltage, and power are not instantaneous values ​​and are not constantly updated, so they may be stored in the NFC communication storage unit 15 when the maximum values ​​are updated.

[0039] According to embodiment 2, the electronic indicating instrument 3A has a power outage detection unit 25, and when a power outage is detected, the measurement value is stored in the NFC communication memory unit 15. Therefore, even when power is not supplied to the electronic indicating instrument 3A, the measurement value can be read from the mobile terminal 20 via NFC communication, which allows power supply.

[0040] In addition, a common method for checking measurement values ​​when the power is off, such as during a power outage, is to operate the device by supplying power from a large-capacity capacitor or an external battery, but this method requires the mounting of power supply components such as components or connectors, which raises concerns about the tightness of component mounting area and increased material costs. In the second embodiment, even when power is not being supplied to the electronic indicating instrument 3A, measurement values ​​can be read by NFC communication that can supply power, which makes it possible to simplify the insulation design on the internal board and reduce material costs by eliminating the need for component mounting.

[0041] Embodiment 3 In the third embodiment, the camera function of the mobile terminal 20 is used to read the two-dimensional codes of the current transformer 30 and the voltage transformer 35, and the rating information of the current transformer 30 and the voltage transformer 35 is imported into the mobile terminal 20. The rating information of the current transformer 30 and the voltage transformer 35 used in combination with the electronic indicating instruments 3, 3A must be confirmed before setting up. The current transformer 30 and the voltage transformer 35 to be used have a two-dimensional code that stores the rating information printed on them, and by reading the two-dimensional code with the camera function of the mobile terminal 20, the rating information of the current transformer 30 and the voltage transformer 35 can be reflected in the setting application of the mobile terminal 20. This makes it possible to prevent mistakes in setting up the current transformer 30 and the voltage transformer 35 and to shorten the time required for the setting up.

[0042] FIG. 7 is a configuration diagram showing a setting system for an electronic indicating instrument in the third embodiment. As shown in FIG. 7, the setting system for an electronic indicating instrument in the third embodiment includes the electronic indicating instrument 3, 3A described in the first and second embodiments, and a mobile terminal 20. The mobile terminal 20 includes a camera 20a, a display unit 20c, a control unit 20b, an NFC communication control unit 20d, and an NFC antenna 20e. The NFC communication control unit 20d is capable of transmitting power. In the third embodiment, the rating information of the transformer 35 and the rating information 30a of the current transformer 30 connected to the electronic indicating instrument 3, 3A are photographed and recognized by the camera 20a of the mobile terminal 20, and the rating information of the transformer 35 and the rating information 30a of the current transformer 30 recognized for the electronic indicating instrument 3, 3A are set by the NFC communication control unit 20d of the mobile terminal 20. In FIG. 7, only the current transformer 30 of the current transformer 30 and the voltage transformer 35 is illustrated.

[0043] The rating information 30a may be converted into a two-dimensional code and affixed to the transformer 35 and the current transformer 30, or the text information written on the rating plate may be photographed by the camera 20a and then digitized by the control unit 20b of the mobile terminal through character recognition.

[0044] According to embodiment 3, the rated information 30a of the transformer 35 and current transformer 30 connected to the electronic indicating instruments 3, 3A is photographed and recognized by the camera 20a of the mobile terminal 20, and the rated information is set for the electronic indicating instruments 3, 3A by the NFC communication control unit 20d of the mobile terminal 20, so that the setting work for the electronic indicating instruments 3, 3A can be performed efficiently and without errors.

[0045] Embodiment 4 In the third embodiment, the rating information is affixed to the transformer 35 and the current transformer 30 as a two-dimensional code or a rating nameplate, whereas in the fourth embodiment, unique identification information is displayed on the transformer 35 and the current transformer 30. The mobile terminal 20 reads this unique identification information and queries a server via the network to obtain the rating information of the transformer 35 and the rating information of the current transformer 30 from the unique identification information.

[0046] Fig. 8 is a configuration diagram showing a setting system for an electronic indicating instrument in the fourth embodiment. As shown in Fig. 8, the setting system for an electronic indicating instrument in the fourth embodiment includes the electronic indicating instrument 3, 3A described in the first and second embodiments, a mobile terminal 20, and a server 40. The mobile terminal 20 includes a camera 20a, a display unit 20c, a control unit 20b, an NFC communication control unit 20d, an NFC antenna 20e, and a network communication unit 20f. The NFC communication control unit 20d is capable of transmitting power. The network communication unit 20f is provided to obtain the rating information of the transformer 35 and the rating information of the current transformer 30 from the server 40 via the network 50.

[0047] The server 40 stores VT, CT rating information 40a including the correspondence between the individual identification information of various transformers and the rating information of various transformers, and the correspondence between the unique identification information of various current transformers and the rating information of various current transformers. In the fourth embodiment, the unique identification information of the transformer 35 and the unique identification information 30b of the current transformer 30 connected to the electronic indicating instrument 3, 3A are photographed and recognized by the camera 20a of the mobile terminal 20, and the recognized unique identification information of the transformer 35 and the unique identification information 30b of the current transformer 30 are used to obtain the rating information of the transformer 35 and the rating information of the current transformer 30 corresponding to the recognized unique identification information of the transformer 35 and the unique identification information 30b of the current transformer 30 from the server 40 via the network 50. Then, the NFC communication control unit 20d of the mobile terminal 20 sets the obtained rating information of the transformer 35 and the rating information 30a of the current transformer 30 to the electronic indicating instrument 3, 3A. Of the current transformer 30 and the voltage transformer 35, only the current transformer 30 is shown in FIG.

[0048] According to embodiment 4, the unique identification information of the transformer 35 and the unique identification information 30b of the current transformer 30 connected to the electronic indicating instrument 3, 3A are photographed by the camera 20a of the mobile terminal 20, the rating information of the transformer 35 and the rating information of the current transformer 30 are obtained from the server 40, and the obtained rating information is set in the electronic indicating instrument 3, 3A by the NFC communication control unit 20d, so that the setting work of the electronic indicating instrument 3, 3A can be performed efficiently and without error.

[0049] The configurations shown in the above embodiments are examples of the contents of the present disclosure, and may be combined with other known technologies, and parts of the configurations may be omitted or modified without departing from the gist of the present disclosure. [Explanation of symbols]

[0050] 1 Electric circuit, 2 AC power supply, 3, 3A electronic indicator, 4 Voltage measurement circuit, 5 Current measurement circuit, 6 Power supply circuit, 6a Internal power supply, 7 Auxiliary power supply, 8 Control device, 9 A / D conversion circuit, 10 Measurement value calculation unit, 11, 20b Control unit, 12 Setting value memory unit, 13 Setting value comparison unit, 14 NFC communication control device, 15 NFC communication memory unit, 16, 20d NFC communication control unit, 17 NFC communication antenna, 18 NFC communication power supply unit, 19 NFC communication power supply, 20 Mobile terminal, 20a Camera, 20c, 23 Display unit, 20e NFC antenna, 20f Network communication unit, 21 Operation unit, 22 Communication unit, 24 Display control unit, 25 Power outage detection unit, 30 Current transformer, 30a Rating information, 30b Unique identification information, 35 Transformer, 40 Server, 40a VT,CT rating information, 50 network.

Claims

1. an antenna unit that communicates with a mobile terminal having a short-range wireless communication function and receives power by electromagnetic induction from radio waves emitted by the mobile terminal; a set value storage unit that stores set values ​​including a phase / wire system, a VT ratio, and a CT ratio; an NFC communication control unit that operates using power received by the antenna unit and receives the setting value from the portable terminal; a control device that stores the setting value received by the NFC communication control unit in the setting value storage unit. An electronic indicating instrument characterized by:

2. an NFC communication storage unit that operates using power received by the antenna unit and stores the setting value received by the NFC communication control unit, The control device saves the setting value stored in the NFC communication storage unit in the setting value storage unit.

2. An electronic indicating instrument according to claim 1.

3. When the control device is powered on and started up, the control device compares the setting value stored in the NFC communication storage unit with the setting value stored in the setting value storage unit, and if the comparison result is a mismatch, stores the setting value stored in the NFC communication storage unit in the setting value storage unit.

3. An electronic indicating instrument according to claim 2.

4. a setting unit that sets the setting value by communication other than the short-range wireless communication or by manual setting, When the setting unit sets the setting value in the setting value storage unit, the control device also stores the setting value in the NFC communication storage unit.

3. An electronic indicating instrument according to claim 2.

5. a measuring unit that measures an amount of electricity using the set value, the NFC communication storage unit stores the amount of electricity measured by the measurement unit in addition to the set value; The NFC communication control unit transmits the amount of electricity to the mobile terminal during communication with the mobile terminal.

3. An electronic indicating instrument according to claim 2.

6. An electronic indicating instrument according to any one of claims 1 to 5; a mobile terminal having a camera and an NFC communication control device capable of transmitting power, the mobile terminal photographing and recognizing rated information of a transformer and a current transformer connected to the electronic indicating instrument with the camera and setting the rated information in the electronic indicating instrument using the NFC communication control device; A setting system for an electronic indicating instrument, comprising:

7. An electronic indicating instrument according to any one of claims 1 to 5; a mobile terminal having a camera, an NFC communication control device capable of transmitting power, and a network communication device for communicating with a server that stores correspondence between unique identification information of voltage and current transformers and rating information of voltage and current transformers, the mobile terminal photographing the unique identification information written on the voltage and current transformers with the camera, acquiring the rating information corresponding to the unique identification information from the server, and setting the rating information in the electronic indicating instrument using the NFC communication control device; A setting system for an electronic indicating instrument, comprising:

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