JP5421702B2 - Electric energy measuring device and electric energy measuring system - Google Patents

Description

  The present invention relates to an electric energy measuring device and an electric energy measuring system for measuring the electric energy consumed by a load device.

  In recent years, in order to reduce carbon dioxide emissions, which are the main cause of global warming, the amount of power consumed is measured for each electrical device that consumes power, and the amount of power actually consumed by individual electrical devices can be easily Energy saving (power saving) is performed so that it can be grasped. And there exists a thing described in patent document 1 as an electric energy measuring device used for such an application.

Utility Model Registration No. 3123583

  Incidentally, the amount of power consumed by an electrical device varies depending on the environment in which the electrical device is used. For example, when an air conditioner (air conditioner) is taken as an example of an electrical device, the amount of power consumed increases as the temperature rises even if the set temperature of the air conditioner is the same. Alternatively, when an electrical device is a lighting fixture, the illuminance increases as the influence of external light (sunlight) increases even if the amount of power consumed is the same, and wasteful power is consumed by far exceeding the required illuminance. Sometimes.

  In this way, there is a relationship between the power consumption of electrical equipment and the usage environment (temperature, brightness, etc.), so it is accurate to judge the degree of energy saving only by the amount of power measured ignoring the usage environment. Therefore, there is a possibility that appropriate measures for energy saving may not be performed.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a power amount measuring apparatus capable of accurately reporting the relationship between the amount of power consumed by an electrical device and the environment in which the electrical device is used. An object is to provide an electric energy measurement system.

In order to achieve the above object, the invention of claim 1 includes an input current measuring means for measuring an input current to an electric device, an input voltage measuring means for measuring an input voltage to the electric device, and an input current measuring means. Calculation means for calculating the amount of power consumed by the electrical equipment based on the measurement result and the measurement result of the input voltage measurement means, physical quantity measurement means for measuring a physical quantity that serves as an index of the environment in which the electrical equipment is used, The display means for displaying characters and the like, the measured value of the electric energy calculated by the calculating means, and the measured value of the physical quantity measured by the physical quantity measuring means in a period overlapping the measurement period of the electric energy are displayed on the display means in association with each other and control means for the energy measurement value and an output means for outputting periodically to the outside by converting the physical quantity measurement into an electrical signal, the input current measuring means and input voltage measuring means, calculating means Measurements of measurement and input voltage of the input current when the physical quantity measured value has reached the predetermined value or a predetermined range is set in advance, and executes the computation of the amount of power.

According to the first aspect of the present invention, the physical quantity that is an index of the environment in which the electric device is used, for example, the temperature, humidity, illuminance, etc. of the usage environment is measured by the physical quantity measuring means, and the electric energy calculated by the calculating means The control means causes the display means to display the measurement value of the physical quantity measured by the physical quantity measurement means in a period overlapping with the measurement period of the electric energy, so that the display means displays the electric energy consumed by the electrical equipment and the electric power It is possible to provide an electric energy measuring device capable of accurately informing the relationship with the environment in which the device is used. In addition, the power measurement value and the physical quantity measurement value can be remotely monitored, and the data management of the power measurement value and the physical quantity measurement value can be easily performed. Furthermore, the input current measurement means, the input voltage measurement means, and the calculation means It is possible to provide an energy measuring device that can reduce power consumption and save power.

The invention of claim 2 comprises a plurality of types of physical quantity measuring means for measuring physical quantities different from each other in the invention of claim 1 , and the control means is a measured value of each physical quantity measured by the plurality of types of physical quantity measuring means. And a measured value of the electric energy are displayed in association with each other on the display means.

According to a third aspect of the present invention, in the second aspect of the present invention, the output means converts the power amount measurement value and the plurality of types of physical quantity measurement values into electrical signals and outputs the same to the outside.

According to the invention of claim 3 , it is possible to remotely monitor the electric energy measurement value and the plural kinds of physical quantity measurement values.

The invention of claim 4 is the invention of any one of claims 1 to 3 , further comprising a housing that houses at least the calculation means, the display means, the control means, and the physical quantity measurement means.

According to invention of Claim 4 , workability improves.

According to a fifth aspect of the present invention, in any one of the first to third aspects, the first housing that houses at least the computing means, the display means, and the control means, and one or more first housings that house the physical quantity measuring means. And a transmission unit that is housed in each of the first and second housings and wirelessly transmits the physical quantity measurement value via a wireless medium.

According to the invention of claim 5 , the physical quantity measuring means can be installed in a place suitable for the measurement of the physical quantity.

In order to achieve the above object, the invention according to claim 6 provides the one or more power amount measuring devices according to any one of claims 1 to 5 and the output from the output means of the power amount measuring device. A display device that receives the electric signal and displays the measured electric energy value and the physical quantity measurement value obtained by inversely converting the electric signal, and the display device includes the measured electric energy value and the measured physical quantity value. It is characterized by displaying the history of the graph as a graph.

According to the invention of claim 6 , it is possible to provide an electric energy measuring system capable of accurately informing the relationship between the electric energy consumed by the electric device and the environment in which the electric device is used, and the consumption of the electric device. The relationship between the electric energy and the environment (physical quantity) can be easily grasped.

  ADVANTAGE OF THE INVENTION According to this invention, the electric energy measuring apparatus and electric power measurement system which can alert | report exactly the relationship between the electric energy consumed with an electric equipment, and the environment where the said electric equipment is used can be provided.

It is a block diagram which shows Embodiment 1 of the electric energy measuring device which concerns on this invention. It is an external appearance perspective view same as the above. 1 is a system configuration diagram showing Embodiment 1 of an electric energy measurement system according to the present invention. It is explanatory drawing same as the above. It is a block diagram which shows Embodiment 2 of the electric energy measuring device which concerns on this invention. It is an external appearance perspective view same as the above. It is a system block diagram which shows Embodiment 2 of the electric energy measuring system which concerns on this invention.

  Hereinafter, a lighting apparatus and an air conditioner (hereinafter, abbreviated as “air conditioner”) will be exemplified as electric devices to describe embodiments of the present invention in detail.

(Embodiment 1)
As shown in FIG. 3, the power amount measurement system of the present embodiment uses a power consumption amount (hereinafter abbreviated as “power amount”) of a lighting fixture (electric device) M1 that is fed from a commercial AC power source AC via a power line Lp1. A power amount measurement device PM1 that measures power consumption amount (hereinafter, abbreviated as a power amount) of an air conditioner (electric device) M2 that is also fed from a commercial AC power supply AC via a power line Lp2. A device PM2 and a personal computer (hereinafter abbreviated as a personal computer) PC that performs data communication with the two power consumption measuring devices PM1 and PM2 and the communication line Ls are configured.

  The two electric energy measuring devices PM1 and PM2 have a common configuration. As shown in FIG. 1, the control unit 1, the voltage input unit 2, the current input unit 3, the display unit 4, the output unit 5, and the communication Unit 6, temperature sensor 7, illuminance sensor 8, flow sensor 9, and power supply unit 10. However, it is not always necessary to provide all of the temperature sensor 7, the illuminance sensor 8, and the flow rate sensor 9, and it is sufficient if at least one of the three types of sensors is provided.

  The voltage input unit 2 steps down the AC voltage applied from the commercial AC power supply AC to the electric device (the lighting fixture M1 or the air conditioner M2) via the power supply line Lp1 or Lp2 to a predetermined level and outputs it to the control unit 1. . The current input unit 3 detects an alternating current (input current) flowing through the power supply line Lp1 or Lp2 by the current sensor CT, converts the secondary current of the current transformer into a voltage signal, and outputs the voltage signal to the control unit 1. Since the voltage input unit 2 and the current input unit 3 are well known in the art, the detailed illustration and description thereof will be omitted.

  The temperature sensor 7 detects the ambient temperature (air temperature) using a thermistor, a thermocouple, and the like, and outputs the detected value (voltage signal) to the control unit 1. The illuminance sensor 8 detects the illuminance of the space (illumination space) illuminated by the lighting fixture M1 using a solar cell, a phototransistor, and the like, and outputs the detected value (voltage signal) to the control unit 1. . The flow sensor 9 has a sensor chip manufactured by MEMS. When there is no flow, the temperature distribution around the heater provided in the sensor chip is symmetrical, and when the flow is received, Since the temperature on the windward side is low, the temperature on the leeward side is high, and the temperature equilibrium state is lost, the flow rate is detected by sensing this temperature difference as the electromotive force difference of the thermopile, and the detected value (voltage signal) is sent to the control unit 1. Output. However, since the temperature sensor 7, the illuminance sensor 8, and the flow rate sensor 9 are well known in the art, detailed configuration and illustration and description of the operation are omitted.

  The display unit 4 includes a liquid crystal display (LCD) and a drive circuit for the liquid crystal display, and the electric energy and temperature of the electric device (the lighting fixture M1 or the air conditioner M2) based on an instruction from the control unit 1 as will be described later. (Atmospheric temperature), illuminance, and / or flow rate are displayed on a liquid crystal display. The output unit 5 outputs the electric energy calculated by the control unit 1 and the detection values of the various sensors 7 to 9 as pulse signals as will be described later. The communication unit 6 performs data communication with the personal computer PC via the signal line Ls by general-purpose serial communication (for example, RS485). The power supply unit 10 converts the AC voltage supplied from the commercial AC power source AC into a DC voltage, and creates operating power sources for the units 1 to 9. Since the display unit 4, the output unit 5, the communication unit 6, and the power supply unit 10 are well known in the art, the detailed illustration and description thereof will be omitted.

  The control unit 1 includes a CPU, a memory, an A / D converter, and the like, and an input voltage value received from the voltage input unit 2 and an input received from the current input unit 3 by executing a program stored in the memory by the CPU. Electric energy calculation processing for calculating the electric energy of the electric device (lighting device M1 or air conditioner M2) based on the current value, the detected value (voltage signal) received from the temperature sensor 7, the illuminance sensor 8, and the flow sensor 9 is the temperature and illuminance. , A physical quantity measurement process for converting to a flow rate, a display process for displaying the power quantity obtained in the power quantity calculation process and a physical quantity obtained in the physical quantity measurement process (temperature, illuminance, and flow rate) on the display unit 4; Pulse signal output processing to be output as a pulse signal from the output unit 5, data for performing the data communication with the personal computer PC by the communication unit 6 and transmitting the power amount, the physical amount, etc. Shin processing is performed and the like.

  FIG. 2 shows an external view of the electric energy measuring devices PM1 and PM2. The housing 30 of the electric energy measuring devices PM1 and PM2 is made of a synthetic resin molded product having a substantially convex side shape when viewed from the left-right direction, and each part 1-10 formed by mounting various electronic components on a printed wiring board is provided inside. Stored. The display surface (display surface of the liquid crystal display) 4a of the display unit 4 is exposed on the front surface of the central projecting part 31 of the housing 30, and an output unit is provided on the upper stage part 32 positioned above the central projecting part 31. 5 and signal terminals (not shown) of the communication unit 6 are exposed, and the lower base unit 33 located below the central projecting unit 31 is connected to the voltage input unit 2, the current input unit 3, and the power supply unit 10. An input terminal (not shown) is exposed.

  Here, in the display process of the control unit 1, the temperature sensor 7, the illuminance sensor 8, or the flow sensor during a period that overlaps the electric energy calculated in the electric energy calculation process (unit: kilowatt hour [kWh]) and the electric energy measurement period. The physical quantities (temperature, illuminance, flow rate) detected (measured) in 9 are associated with each other (arranged in the vertical direction) and displayed on the display unit 4. For example, in the electric energy measuring device PM2 that measures the electric energy of the air conditioner M2, the electric energy and temperature (air temperature) measured and measured in the same period on the display surface 4a of the display unit 4 as shown in FIG. Displayed side by side in the vertical direction at the same time. Therefore, by looking at the display surface 4a of the display unit 4, the relationship between the temperature and the amount of power of the air conditioner M2 can be confirmed at a glance. However, in the illustrated example, only the temperature is displayed at the same time as the amount of power. However, the temperature and flow rate may be displayed at the same time as the amount of power. In the power amount measuring device PM2 that measures the power amount of the lighting fixture M1, Not only the electric energy and illuminance, but also the electric energy, illuminance, and temperature may be displayed in the vertical direction on the display surface 4 a of the display unit 4.

  Further, when the control unit 1 executes the pulse signal output process and outputs the pulse signal from the output unit 5, the number of pulses of the pulse signal is counted by a counter (not shown), and the count value is calculated based on the power amount or the physical amount (temperature, (Illuminance, flow rate) and the converted numerical value can be displayed to remotely monitor the electric energy and physical quantity. Here, if the control unit 1 periodically outputs a pulse signal from the output unit 5, there is an advantage that data management of the electric energy and the physical quantity can be easily performed outside. Alternatively, when the physical quantity becomes a predetermined value or a predetermined range set in advance, for example, when the temperature (air temperature) detected by the temperature sensor 7 is 26 ° C. or more, the power amount measuring device PM2 corresponds to the power amount and the temperature. A pulse signal may be output from the output unit 5. Furthermore, when the electric energy reaches a predetermined value or a predetermined range, the electric energy measuring devices PM1 and PM2 output a pulse signal corresponding to the electric energy and the physical quantity (temperature, illuminance, flow rate) from the output unit 5. It doesn't matter.

  Here, since the air conditioner M2 is air-cooled or heated when the air temperature is higher or lower than room temperature, it is not necessary to measure the amount of electric power when the air-conditioner does not require air-conditioning or heating. Therefore, in the control unit 1 of the electric energy measuring device PM2, when the temperature (air temperature) detected by the temperature sensor 7 reaches a predetermined value (for example, 30 ° C. or more or less than 10 ° C.), the voltage input unit 2 and the current input unit 3 is operated to execute the electric energy calculation process, and the voltage input unit 2 and the current input unit 3 are not operated when the air conditioner M2 is not operated (for example, the temperature is in the range of 10 ° C. or more and less than 30 ° C.). Moreover, by not executing the power amount calculation process, it is possible to reduce the power consumption of the power amount measuring device PM2 and to save power.

  By the way, in the electric energy measuring system of this embodiment, the electric energy of the electric equipment (the lighting fixture M1 and the air conditioner M2) measured by the individual electric energy measuring devices PM1 and PM2 is transmitted to the personal computer PC via the signal line Ls. Can do. If the data processing software installed on the PC is used, the history of the power and physical quantities (temperature, illuminance, flow) received from each of the power measuring devices PM1 and PM2 is displayed as a graph on the monitor. can do. For example, as shown in FIG. 4, if the electric energy is displayed as a bar graph (see the solid line A in FIG. 4) and the temperature is displayed as a line graph (see the solid line B in FIG. 4), the temperature and the electric energy of the air conditioner M2 It becomes possible to easily grasp the relationship.

  As described above, according to the present embodiment, a physical quantity serving as an index of an environment in which an electric device (such as the lighting fixture M1 or the air conditioner M2) is used, for example, temperature, illuminance, flow rate, etc. Sensor 7, illuminance sensor 8, flow sensor 9, etc.) and measured by the physical quantity measuring means in a period that overlaps the measured value of the electric energy calculated by the calculating means (control unit 1) and the measurement period of the electric energy. Since the control unit 1 which is a control unit correlates with the measured value (temperature, illuminance, flow rate, etc.) of the physical quantity displayed on the display unit (display unit 4), the amount of power consumed by the electric device and the electric device used It is possible to accurately inform the relationship with the environment.

(Embodiment 2)
As shown in FIG. 7, the present embodiment is characterized in that the electric energy measuring device is composed of parent devices PM1 ′, PM2 ′ and sensor slave devices PS1, PS2, PS3.

  As shown in FIG. 5, the parent devices PM1 ′ and PM2 ′ of the electric energy measuring device replace the temperature sensor 7, the illuminance sensor 8, and the flow sensor 9 of the electric energy measuring devices PM1 and PM2 according to the first embodiment. It has. However, since the control unit 1, the voltage input unit 2, the current input unit 3, the display unit 4, the output unit 5, the communication unit 6, and the power supply unit 10 are the same as those of the power amount measurement devices PM1 and PM2 in the first embodiment, details The detailed explanation is omitted.

  The wireless communication unit 11 performs data communication using radio waves as a wireless medium. For example, the “radio station of a low-power data communication system” defined in Article 6, Paragraph 4, Item 4 of the Radio Law Enforcement Regulations In accordance with the above, radio signals using radio waves as a medium are transmitted and received. However, since the detailed configuration of the wireless communication unit 11 is well known in the art, illustration and description thereof are omitted.

  As shown in FIG. 5, the sensor slave units PS1, PS2, and PS3 include a control unit 20, a wireless communication unit 21, a temperature sensor 22, an illuminance sensor 23, a flow rate sensor 24, a display unit 25, and a battery power supply unit 26. However, it is not always necessary to provide all of the temperature sensor 22, the illuminance sensor 23, and the flow rate sensor 24, and it is sufficient if at least one of the three types of sensors is provided. Further, the temperature sensor 22, the illuminance sensor 23, and the flow sensor 24 are all the same as the temperature sensor 7, the illuminance sensor 8, and the flow sensor 9 in the first embodiment, and thus the description thereof is omitted.

  The wireless communication unit 21 performs data communication using radio waves as a wireless medium in the same manner as the wireless communication units 11 of the parent devices PM1 ′ and PM2 ′. For example, the Radio Law Enforcement Regulations Article 6 Paragraph 4 Paragraph 4 In accordance with the “radio station for low-power data communication system” defined in the “No.”, radio signals using radio waves as a medium are transmitted and received. However, since the detailed configuration of the wireless communication unit 21 is well known in the art, illustration and description thereof are omitted.

  The display unit 25 includes a liquid crystal display (LCD) and a driving circuit for the liquid crystal display, and a temperature (temperature) detected by the temperature sensor 22 based on an instruction from the control unit 20 and an illuminance sensor 23 as described later. At least one physical quantity of the illuminance to be detected and the flow rate detected by the flow sensor 24 is displayed on the liquid crystal display. The battery power supply unit 26 stabilizes the DC voltage supplied from the primary battery or the secondary battery and supplies operating power to the units 20 to 25. The display unit 25 and the battery power source unit 26 are well known in the art, and thus detailed illustration and description thereof will be omitted.

  The control unit 20 includes a CPU, a memory, an A / D converter, and the like, and a detection value (voltage) received from the temperature sensor 22, the illuminance sensor 23, and the flow sensor 24 by executing a program stored in the memory by the CPU. Signal) is converted into temperature, illuminance, and flow rate, the physical quantity (temperature, illuminance, and flow rate) obtained by the physical quantity measurement process is displayed on the display unit 25, and the physical quantity is wirelessly transmitted by the wireless communication unit 21. Thus, data communication processing to be transmitted to the parent devices PM1 ′ and PM2 ′ is performed.

  FIG. 6 shows an external view of the sensor slave units PS1, PS2, and PS3. The housing (second housing) 40 of the sensor slave unit PSm (m = 1, 2, 3) is made of a synthetic resin molded product having a flat rectangular box shape, and various parts formed by mounting various electronic components on a printed wiring board. 20 to 26 are housed inside. A display surface (display surface of the liquid crystal display) 25 a of the display unit 25 is exposed on the front surface of the housing 40.

  Here, in the display process of the control unit 20, among physical quantities (temperature, illuminance, flow rate) detected (measured) by the temperature sensor 22, the illuminance sensor 23, or the flow sensor 24, for example, as shown in FIG. The illuminance is displayed in the vertical direction on the display surface 25a of the display unit 25 at the same time.

  Next, the operation of this embodiment will be described.

  The control unit 1 of the parent devices PM1 ′ and PM2 ′ performs data calculation of physical quantities (temperature, illuminance, flow rate) detected by the sensor slave unit PSm using wireless communication by the wireless communication unit 11 while executing power amount calculation processing. Collect from each sensor slave unit PSm. Here, the data transmitted by each sensor slave unit PSm includes not only the detection value of the physical quantity but also the time (time stamp) when the detection value is detected. Therefore, in the display process of the control unit 1, the physical quantity (temperature, illuminance, flow rate) of the data in which the electric energy calculated in the electric energy calculation process (unit: kilowatt hour [kWh]) and the measurement period of the electric energy overlap with the time stamp. Are displayed on the display unit 4 in the vertical direction. Here, the control unit 1 of the master units PM1 ′ and PM2 ′ may periodically acquire physical quantity data from each sensor slave unit PSm, and the power amount becomes a predetermined value or a predetermined range set in advance. Sometimes, physical quantity data may be acquired from each sensor slave unit PSm. Alternatively, when the physical quantity becomes a predetermined value or a predetermined range set in advance, for example, when the temperature (air temperature) detected by the temperature sensor 22 is 26 ° C. or higher, the control unit 20 of the sensor slave unit PSm performs physical quantity data. May be transmitted to the parent devices PM1 ′ and PM2 ′ by wireless communication.

  Here, since the air conditioner M2 is air-cooled or heated when the air temperature is higher or lower than room temperature, it is not necessary to measure the amount of electric power when the air-conditioner does not require air-conditioning or heating. Therefore, in the control unit 1 of the master unit PM2 ′, when the temperature (air temperature) data received from the temperature sensor 22 by wireless communication becomes a predetermined value (for example, 30 ° C. or more or less than 10 ° C.), the voltage input unit 2, The power input calculation process is executed by operating the current input unit 3, and the voltage input unit 2 and the current input unit 3 are not operated when the temperature (air temperature) data received from the temperature sensor 22 by wireless communication is other than a predetermined value. Further, by not executing the power amount calculation process, it is possible to reduce the power consumption of the parent device PM2 ′ and to save power.

  As described above, according to the present embodiment, the parent devices PM1 ′ and PM2 ′ that measure the amount of electric power of the electric devices (such as the lighting fixture M1 and the air conditioner M2), and the physical quantities that are indicators of the environment in which the electric devices are used, For example, an electric energy measuring device is configured with a sensor slave unit PSm provided with physical quantity measuring means (temperature sensor 22, illuminance sensor 23, flow rate sensor 24, etc.) for measuring temperature, illuminance, flow rate, etc. of the use environment, Since the physical quantities measured by the machine PSm are transmitted to the parent devices PM1 ′ and PM2 ′ by wireless communication, the physical quantity measuring means (temperature sensor 22, illuminance sensor 23, flow sensor 24, etc.) are suitable for measuring each physical quantity. There is an advantage that it can be easily installed in a place.

  In the first and second embodiments, temperature (air temperature), illuminance, and flow rate are exemplified as physical quantities serving as an index of the environment in which the electric device is used. However, the present invention is not limited to these, and other types depending on the type of electric device. Physical quantities such as humidity and carbon dioxide concentration may be measured.

PM1, PM2 Electric energy measuring device 1 Control unit (calculation means, control means)
2 Voltage input section (input voltage measuring means)
3 Current input (input current measuring means)
4 Display section (display means)
7 Temperature sensor (physical quantity measuring means)
8 Illuminance sensor (physical quantity measuring means)
9 Flow sensor (physical quantity measuring means)

Claims (6)

An input current measuring means for measuring an input current to the electric equipment, an input voltage measuring means for measuring an input voltage to the electric equipment, an electric equipment based on a measurement result of the input current measuring means and a measurement result of the input voltage measuring means Calculated by the computing means, the physical quantity measuring means for measuring the physical quantity that is an indicator of the environment in which the electrical equipment is used, the display means for displaying numbers and characters, and the computing means. Control means for associating and displaying on the display means the measurement value of the electric energy and the measurement value of the physical quantity measured by the physical quantity measurement means in a period overlapping with the measurement period of the electric energy; and the electric energy measurement value and the physical quantity measurement value the and output means into an electric signal and outputs periodically to the outside, the input current measuring means and input voltage measuring means, calculating means, a predetermined value Wakashi the physical quantity measurement value is set in advance The measurement of the measurement and the input voltage of the input current when a predetermined range, electric energy measuring apparatus and executes the computation of the amount of power. Provided with a plurality of types of physical quantity measuring means for measuring different physical quantities, and the control means displays the measured value of each physical quantity and the measured value of the electric energy in association with each other measured by the plurality of types of physical quantity measuring means and displays them on the display means energy measurement apparatus according to claim 1, wherein the cause. 3. The electric energy measuring apparatus according to claim 2, wherein the output means converts the electric energy measurement values and the plural types of physical quantity measurement values into electric signals and outputs them to the outside . The electric energy measuring apparatus according to any one of claims 1 to 3, further comprising a housing that houses at least a computing unit, a display unit, a control unit, and a physical quantity measuring unit . A first housing that houses at least the computing means, the display means, and the control means; one or more second housings that house the physical quantity measuring means; and the first and second housings that are housed in a wireless medium, respectively. The electric energy measuring device according to claim 1, further comprising: a transmission unit that wirelessly transmits the physical quantity measurement value . It is obtained by receiving the electrical signal output from one or a plurality of the energy measuring devices according to any one of claims 1 to 5 and an output unit of the energy measuring device and inversely converting the electrical signals. A display device for displaying the measured electric energy value and the measured physical quantity value,
The display device displays the power measurement value and the history of the physical quantity measurement in a graph and displays the graph .

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