JP4729252B2 - Electronic energy meter - Google Patents

Description

  The present invention relates to an electronic watt-hour meter, and more particularly to a multifunction electronic watt-hour meter capable of displaying various measurement information such as a current measurement value and a measurement final value.

  As this type of electronic watt-hour meter, there is known a configuration in which a number of display windows are provided in the watt-hour meter body, and measurement information is displayed cyclically (periodically in a time division manner) on the display window. .

  An example of the display part of this conventional electronic watt-hour meter is shown in FIGS. 6 (a) to 6 (c). FIG. 6A shows a state in which the display unit 100 displays a so-called current measurement value that is currently measured, and FIG. 6B shows that the display unit 100 is confirmed at a predetermined date and time. The state where the so-called measurement fixed value is displayed is shown.

  FIG. 6C shows various data related to the watt hour meter, that is, the current year, the current month, and the current time by operating a setting button (not shown) provided on the electronic watt hour meter. This shows a state in which these various data are displayed on the display unit 100 when setting the measurement display date, and the status display of the current measurement value and the measurement determination value (measurement value to be checked at the time of meter reading).

  The display unit 100 includes a first display window 101 for displaying the total daily power amount, a second display window 102 for displaying the maximum demand power, and power according to the states shown in FIGS. 6 (a) to 6 (c). A third display window 103 for displaying the measured active power amount, a fourth display window 104 for displaying the current or accumulated maximum demand power, a fifth display window 105 for displaying the time limit or power factor (power factor × 100), force measurement invalidity A sixth display window 106 for displaying the electric energy, a seventh display window 107 for displaying the current time or the measured final value, an eighth display window 108 for displaying the operation state of the watt hour meter, and the current measured value and the final measured value A ninth display window 109 for displaying different display modes is provided.

  As described above, the display unit 100 cyclically displays the current measurement value display state (FIG. 6A) and the measurement final value display state (FIG. 6B). 100 is only the one corresponding to the measurement value, and in the current measurement value display state (FIG. 6A), a total of five measurement values are simultaneously displayed, and the measurement final value display state (FIG. 6). In (b)), a total of six measurement values are displayed simultaneously.

  As described above, since the conventional electronic watt hour meter uses a plurality of liquid crystal display panels and liquid crystal drivers, the size is increased and the cost is increased. Since the measurement value and the measurement confirmation value are automatically displayed at the same time, it is difficult to read the measurement information, especially when the watt hour meter is installed in a high place or a closed place, and it is easy to collect information. There was an inferior problem.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide an electronic watt-hour meter having excellent information collection operability.

An electronic watt-hour meter according to the present invention includes a voltage / current measuring means for measuring voltage and current, a display unit for displaying a measurement value based on the voltage value and the current value, and controlling the display unit to measure the measurement A watt hour meter main body provided with a control means for displaying a value and a command supply means for supplying an external command to the control means, and provided separately from the watt hour meter main body, In an electronic watt-hour meter comprising an operation terminal for operating the display state of the display unit via the control unit by wirelessly transmitting to the command supply unit, the display unit is currently measured A first display mode for displaying the measured value by time zone, the time zone classification, the maximum demand power, and the current demand power, and a second display mode for displaying the force measurement active energy and force measurement reactive energy Divided into the first display mode and The first display state in which the second display mode is cyclically displayed, and the measurement confirmation value that is fixed at a predetermined date and time, the power amount by time zone, the time zone classification, the maximum demand power, and the cumulative maximum demand power are displayed. A first display mode is divided into a second display mode for displaying force measurement active energy, force measurement reactive energy, and power factor, and the first display mode and the second display mode are displayed cyclically. Two display states, and switching between the first display state and the second display state is performed based on the command from the operation terminal, and the first display mode of the first display state is changed. The display time is set longer than the display time of the second display mode in the first display state, and the display time of the first display mode in the second display state is longer than the display time of the second display mode in the second display state. Set long and second The display time in the first display mode in the display state is set to be longer than the display time in the first display mode in the first display state, and the display time in the second display mode in the second display state is the first display state in the first display state. It is configured to be set longer than the display time in the two display mode .

According to the electronic watt-hour meter, the display unit divides the current measured value currently measured into two display modes and displays them cyclically, and the measurement determined at a predetermined date and time. Since it is configured to take the second display state in which the determined value is divided into two display modes and displayed cyclically, the measurement information can be displayed in an easily visible state. Moreover, since it is configured to switch between the first display state and the second display state based on a command from the operation terminal separated from the watt-hour meter main body, measurement information can be collected arbitrarily by remote operation. Will be able to.

In addition , by operating the operation terminal, in normal times, from the measurement value group consisting of power consumption by time zone, time zone classification, maximum demand power, and current demand power, force measurement active power amount and force measurement reactive power amount Each measured value group can be displayed in one display mode. On the other hand, at the time of meter reading, a measured value group consisting of hourly power consumption, time zone classification, maximum demand power, and cumulative maximum demand power And the measurement value group including the force measurement active power amount, the force measurement reactive power amount, and the power factor can be displayed in one display mode.
In the electronic watt-hour meter, each first display mode in the first display state and the second display state is preferably displayed longer than the second display mode.
In the electronic watt-hour meter, it is preferable that the second display state is displayed longer than the first display state.

  In the electronic watt-hour meter, the current measurement value, the measurement final value, and various data related to the watt-hour meter are stored in a rewritable and rewritable nonvolatile memory provided in the watt-hour meter body, It is preferable that the current measurement value, the measurement fixed value, and various data are set and corrected by operating the operation terminal.

  According to the above preferred configuration, by operating the operation terminal, it is possible to remotely set and correct the current measurement value, measurement confirmation value, and various data, and the measurement information is written and rewritten. Therefore, the setting and correction of various data can be performed safely, easily and reliably as compared with the case where a key provided on the watt hour meter is operated.

  In the electronic watt-hour meter, the watt-hour meter main body is provided with a transmission unit that transmits the current measurement value, measurement final value, and various data to the operation terminal by operating the operation terminal, The operation terminal stores the received current measurement value, measurement final value, and various data, and can supply the stored current measurement value, measurement final value, and various data to an external electronic device. It is preferable to be configured.

According to the preferable configuration, by operating the operation terminal, the measurement information stored in the watt hour meter main body can be stored in the operation terminal by remote operation, and the stored measurement information and the like can be stored. For example, it can be supplied to an external computer.
In the electronic watt-hour meter, the display unit includes first to ninth display windows, and the first display window includes the first time display mode in the first display state and the first time display mode. The force measurement active power amount in the second display mode, or the time-based power amount in the first display mode in the second display state and the force measurement active power amount in the second display mode are displayed, and the second display window The maximum power demand in the first display mode in the first display state or the maximum power demand in the first display mode in the second display state is displayed, and the third display window is the first display mode in the first display state. The time zone division in the first display mode in the second display state or the time zone division in the second display state is displayed, and the fourth display window displays the force measurement reactive energy or the second display in the second display mode in the first display state. Force measurement reactive energy in the second display mode in the state The fifth display window displays the current demand power in the first display mode in the first display state or the cumulative maximum demand power in the first display mode in the second display state, and the sixth display window The time period in the first display mode in the first display state or the power factor in the second display mode in the second display state is displayed, and the seventh display window is a watt hour meter in the first display mode in the first display state The operation state of the watt hour meter in the second display mode or the operation state of the watt hour meter in the first display mode and the operation state of the watt hour meter in the second display mode are displayed. The eighth display window displays that the measurement confirmation value is being displayed in the second display state, and the ninth display window displays the current time in the first display state or the measurement confirmation date in the second display state. It is preferable.

  As described above, according to the electronic watt-hour meter according to the present invention, measurement information can be displayed in an easily visible state, so that reading of the measurement information is facilitated, and the measurement information is remotely transmitted. Since it can be arbitrarily collected by operation, it is excellent in operability of information collection.

  Hereinafter, an embodiment of an electronic watt-hour meter according to the present invention will be described with reference to the drawings. FIG. 1 is a block diagram of the electronic watt-hour meter of this embodiment. The electronic watt-hour meter includes a voltage / current measuring means 1 for measuring voltage and current, a display unit 4 for displaying a measurement value based on the voltage value and the current value, and controlling the display unit 4 to measure the measurement. A watt-hour meter main body 5 provided with a CPU (Central Processing Unit) (control means) 3 for displaying a value and a command supply means 8 for supplying an external command to the control means 3 is provided. In the electronic watt-hour meter shown in FIG. 1, it is converted into a measurement pulse proportional to the power value obtained by calculating the voltage value and the current value measured by the voltage / current measuring means 1 and supplied to the CPU 3. A W / F converter 2 is provided.

  The voltage / current measuring means 1 converts the input current from 1S, 1L, and 3S, 3L in the power metering circuit (three-phase three-wire distribution line) into a minute current and supplies it to the W / F converter 2 A pair of current transformers 1a, 1a, and a noise filter 1b for preventing surge voltage or the like from entering the (effective) voltage from P1, P2, P3 in the power metering circuit (three-phase three-wire distribution line) There is provided a step-down circuit 1c that converts the input voltage that has passed through the noise filter 1b into a value suitable for the arithmetic operation of the W / F converter 2. Connected to the noise filter 1b is a power supply circuit 21 that steps down and rectifies the input voltage and supplies it to the CPU 3 and each circuit.

  The W / F converter 2 is connected to a crystal oscillation circuit 2b that supplies a reference clock signal for calculation and a reference voltage circuit 2c that supplies a reference voltage for calculation. Further, a crystal oscillation circuit 3b for supplying a reference clock signal for control, a reset circuit, and a time zone division selection jumper 3d are connected, and further, a measurement for outputting a measurement pulse supplied from the W / F converter 2 to the outside. A pulse output circuit 22 is connected.

  The W / F converter 2 and the control means 3 control the W / F converter 2 with the signal line 3a for supplying the measurement pulse converted by the W / F converter 2 to the control means 3, and the control means 3, The signal line 2a for supplying a signal for reading the measurement pulse (measurement information) from the / F converter 2 is connected.

  The command supply means 8 has an infrared light receiver 8a that receives an infrared pulse transmitted from the outside, demodulates it into received data, and supplies it to the CPU 3.

  The display unit 4 includes a liquid crystal display plate 9 for displaying measurement information and a liquid crystal driver 11 for driving the liquid crystal display plate 9, and the liquid crystal driver 11 is connected to the CPU 3 so as to be controllable. ing.

  The display unit 4 is controlled by the CPU 3 to divide the current measurement value currently measured into two display modes and display them cyclically, and the measurement determined at a predetermined date and time. It is configured to take a second display state in which the determined value is divided into two display modes and displayed cyclically. Specifically, in the first display state, the display unit 4 includes a first display mode for displaying a current measurement value, a power amount for each time zone, a time zone classification, a maximum demand power, and a current demand power, It divides into the 2nd display mode which displays active electric energy and force measurement reactive electric energy, and displays it cyclically, and in the said 2nd display state, a measurement fixed value is divided into electric energy according to time zone, time zone classification, It is divided into a first display mode that displays maximum demand power and cumulative maximum demand power, and a second display mode that displays force measurement active energy, force measurement reactive energy, and power factor, and displays them cyclically. It is configured as follows. Here, the electric energy for each time zone is divided into four time zones, and in both the first display state and the second display state, daytime 1 (first time zone), daytime 2 (second time zone) ), The electric energy for each time zone at night (third time zone) and peak (fourth time zone) is cyclically displayed.

  In addition, the electronic watt-hour meter of the present embodiment is controlled by the CPU 3, so that the first data group that requires frequent setting and correction in the operation of the watt-hour meter, that is, the return to the maximum demand power, The date (year / month / day) / time (hour / minute), measurement confirmation date, instrument ID number, composite metamorphic ratio, screen display time interval, and simultaneous measurement mode return are displayed on the liquid crystal display plate 9 of the display unit 4, and The first data group is configured to be in a state where setting and correction are possible (hereinafter referred to as a setting state).

  In FIG. 2 (a), the display unit 4 of the electronic watt-hour meter of the present embodiment shows that the current measured value is a power amount by time zone, a time zone classification, a maximum demand power, and a current current value in the first display state. The state in the 1st display mode which displays demand electric power, a time limit, the present time, and the operation state of a watt-hour meter is shown. Referring to FIG. 2A, in the first display mode of the first display state, the first display window 51, the third display window 53, the second display window 52, and the fifth provided on the liquid crystal display panel 9. In the display window 55, the sixth display window 56, the seventh display window 57, and the ninth display window 59, the power amount by time zone, the time zone classification, the maximum demand power, the current demand power, the power factor, and the watt hour meter are respectively displayed. The operating status and current time are displayed.

  In FIG. 2 (b), the display unit 4 of the electronic watt-hour meter displays the current measurement value, the force measurement active energy amount and the force measurement reactive energy amount, the current time and the energy meter in the first display state. The state in the second display mode for displaying the operation state is shown. Referring to FIG. 2B, in the second display mode of the first display state, the first display window 51, the fourth display window 54, the seventh display window 57, and the 9 display window 59 displays force measurement active energy, force measurement reactive energy, operation state of watt hour meter, and current time, respectively.

  FIG. 3 (a) shows that the display unit 4 of the electronic watt-hour meter is in the second display state, the amount of power by time zone, the time zone classification, the maximum demand power, and the cumulative maximum demand power, which are measurement final values. And the state in the first display mode for displaying the measurement confirmation date and the operation state of the watt hour meter. Referring to FIG. 3A, in the first display mode of the second display state, “meter reading” indicating that the measurement confirmation value is being displayed on the eighth display window 58 provided on the liquid crystal display panel 9. In addition to the display, the first display window 51, the third display window 53, the second display window 52, the fifth display window 55, the seventh display window 57, and the ninth display window 59 provided on the liquid crystal display panel 9. In addition, the power amount by time zone, the time zone classification, the maximum demand power, the cumulative maximum demand power, the operation state of the watt hour meter, and the measurement confirmation date are displayed.

  In FIG. 3 (b), the display unit 4 of the electronic watt-hour meter displays the force measurement active power, force measurement reactive power, and power factor, which are measurement fixed values, in the second display state. The state in the 2nd display mode which displays a day and the operation state of a watt-hour meter is shown. Referring to FIG. 3B, in the second display mode of the second display state, “meter reading” indicating that the measurement confirmation value is being displayed on the eighth display window 58 provided on the liquid crystal display panel 9. In addition to the display, force measurement is effective in the first display window 51, the fourth display window 54, the sixth display window 56, the seventh display window 57, and the ninth display window 59 provided on the liquid crystal display panel 9. The power amount, force measurement reactive power amount, power factor, watt-hour meter operating state, and measurement confirmation date are displayed.

  FIG. 4 shows a state in which the display unit 4 of the electronic watt-hour meter displays the current year, current month, current time, and measurement confirmation date in the set state. Referring to FIG. 4, in the set state, current year is set in second display window 52, fifth display window 55, ninth display window 59, and sixth display window 56 provided on liquid crystal display panel 9. The current month, date, time, and confirmation date are displayed.

  In the electronic watt-hour meter of this embodiment, an electrically erasable and programmable read only memory (nonvolatile memory) 12 that is electrically writable and rewritable is connected to the CPU 3. The EEPROM 12 is controlled by the CPU 3 so that the current measurement value and the measurement final value calculated by the CPU 3 based on the measurement pulse and various data related to the watt hour meter can be stored and read. The current measurement value and measurement final value are saved (sampled) at the time of power failure and measurement finalization.

  The various data includes the first data group and the second data group (instrument specific information) necessary for management of the watt-hour meter, that is, manufacturer name, model, year of manufacture, serial number, number of instructions, multiplier. Rate, type approval number, supply voltage method, capacity, valid time, customer management information, and instrument ID number.

  The electronic watt-hour meter of the present embodiment is provided separately from the watt-hour meter main body 5, and transmits an input command to the command supply means 8 by an infrared pulse so that the display unit 4 can be connected via the CPU 3. The display state is operated, the CPU 3 is operated, the current weighing value, the weighing final value, and the various data are transmitted from the transmitting unit 13 described later, and the current weighing value, the weighing final value, and the various data are received. And an external terminal (operation terminal) 7 is provided. Specifically, the external terminal 7 includes a keyboard unit 10 for manually inputting various commands for operating the watt hour meter body 5 and the external terminal 7 itself, and a display unit 15 for displaying the commands on the screen. A pulse signal conversion unit (not shown) that converts the command into a pulse signal; a phototransistor that converts the pulse signal into an infrared pulse and transmits it to the command supply means 8; An infrared pickup 14 is provided. Further, the external terminal 7 has a memory (not shown) for storing the received current measured value, measured final value, and various data, and the current measured value, final measured value stored in the memory, and An interface device (not shown) for supplying various data to an electronic device such as an external computer is provided.

  In addition, by operating the external terminal 7 (inputting a necessary command to the keyboard unit 10 of the external terminal 7), the current metered value, the measured final value, and the various data are input to the watt-hour meter body 5. A transmission unit 13 for transmitting to the external terminal 7 is provided. Specifically, the transmission unit 13 is connected to the CPU 3, and the current measurement value, measurement determination value, and various data that are data to be transmitted are stored in the EEPROM 12 or the RAM (not shown) incorporated in the CPU 3 via the CPU 3. A logic circuit unit 13a that receives the modulation pulse as a modulation pulse, and an infrared LED 13b that converts the modulation pulse into an infrared pulse and transmits the infrared pulse to the infrared pickup 14 of the external terminal 7. The infrared LED 13b and the infrared pickup 14 form a so-called photocoupler. The watt-hour meter body 5 and the external terminal 7 are connected by a circuit that transmits a signal according to a change in current, and can communicate with each other. It has become.

  Hereinafter, the operation of the electronic watt-hour meter of this embodiment will be described. In the W / F converter 2 of the watt-hour meter body 5, the voltage value and the current value measured by the voltage / current measuring means 1 are converted into a measurement pulse proportional to the electric energy obtained by calculation, and the measurement pulse is converted into a measurement pulse. The signal is supplied to the CPU 3 through the signal line 3a. The CPU 3 supplies the measurement pulse to the measurement pulse output circuit 22 according to a program stored therein, and controls the measurement pulse output circuit 22 to output it to the outside, while the liquid crystal driver 11 of the display unit 4 And the liquid crystal display panel 9 is driven to display measurement information based on the measurement pulse.

  The display unit 4 is normally in the first display state, and the current measurement value based on the voltage value and the current value steadily measured by the voltage / current measurement means 1 is the process S1 and process of FIG. In S2, each is divided into the first display mode and the second display mode and displayed cyclically. Specifically, a process of maintaining the first display mode for 20 seconds (process S1 in FIG. 5) and a process of maintaining the second display mode for 10 seconds (process S2 of FIG. 5) are cyclically repeated. Yes. In the first display mode, the time zone measurement values are divided into the four time zones described above, and are cyclically displayed on the first display window 51 at intervals of 5 seconds.

In this first display state, when YES is determined in the determination step S3 of FIG. 5, that is, at the time of meter reading, the keyboard unit 10 of the external terminal 7 displays the measurement final value instead of displaying the current measurement value. When a command (hereinafter referred to as a measurement confirmation value display command) is input, the display unit 4 switches from the first display state to the second display state, and the measurement confirmation value display command is transmitted to the external terminal. 7 is converted into a pulse signal by the pulse signal conversion unit of the external terminal 7, and the pulse signal is converted into an infrared pulse by the infrared pickup 14 and transmitted. The light is received by the light receiver 8a, demodulated into received data, and supplied to the CPU 3.

  Thereafter, based on the weighing confirmation value display command, the CPU 3 reads the weighing confirmation value stored in advance from the EEPROM 12, and the liquid crystal display panel 9 is controlled via the liquid crystal driver 11, so that the process S5 in FIG. In step S <b> 6, the read measurement confirmation value is cyclically displayed on the liquid crystal display panel 9. Specifically, the process of maintaining the first display mode for 40 seconds (process S5 in FIG. 5) and the process of maintaining the second display mode for 20 seconds (process S6 of FIG. 5) are cyclically repeated. Yes. In the first display mode, the time zone measurement values are divided into the four time zones described above and are cyclically displayed on the first display window 51 at intervals of 10 seconds.

Then, unless a cancel command for canceling the measurement fixed value display state is input to the keyboard unit 10 of the external terminal 7, NO is determined in the determination step S7 of FIG. 5, and the second display state is continued. On the other hand, if the release command is input to the keyboard portion 10 of the external terminal 7 or if YES is determined in step S7 of FIG. 5 after a predetermined time has elapsed, the first display state is set. Return.

On the other hand, if NO is determined in the determination step S3 of FIG. 5, that is, if a measurement confirmation value display command is not input to the keyboard unit 10 of the external terminal 7, the first display state is restored.

In the first display state, if YES is determined in the determination step S4 of FIG. 5, that is, a setting command is input to the keyboard unit 10 of the external terminal 7 to set the electronic watt-hour meter to the setting state described above. When the electronic watt hour meter is set, the electronic watt-hour meter enters the set state (step S8 in FIG. 5), the setting command is displayed on the display unit 15 of the external terminal 7, and the pulse signal conversion unit of the external terminal 7 performs a pulse. The pulse signal is converted into an infrared pulse by the infrared pickup 14 and transmitted by the infrared pickup 14, received by the infrared receiver 8 a of the wattmeter body 5, demodulated into received data, and supplied to the CPU 3.

In this setting state, the first data group can be set and corrected by inputting a necessary command to the keyboard unit 10 of the external terminal 7. In the setting state shown in FIG. 4, the current year displayed in the second display window 52, the current date displayed in the fifth display window 55, and the current time displayed in the ninth display window 59. Can be set and corrected.

Then, unless a cancel command for canceling the setting state is input to the keyboard unit 10 of the external terminal 7, it is determined NO in the determination step S9 of FIG. 5, and the setting state continues. On the other hand, if the release command is input to the keyboard portion 10 of the external terminal 7 or if YES is determined in step S9 in FIG. 5 after a predetermined time has elapsed, the first display state is set. Return.

On the other hand, if NO is determined in the determination step S4 of FIG. 5, that is, if no setting command is input to the keyboard unit 10 of the external terminal 7, the first display state is restored.

For example, at the time of meter reading of the electronic watt-hour meter, at the time of verification or replacement, the current measured value and the measured final value stored in the EEPROM 12 of the electronic watt-hour meter and the second data group (instrument specific information) ) (Hereinafter referred to as management information), the external terminal 7 is operated to input a necessary command to the keyboard unit 10 to respond to the command from the external terminal 7 to the command supply means 8. The infrared pulse is transmitted, and the CPU 3 is operated based on the command, and the management information converted into the infrared pulse is transmitted from the transmission unit 13 of the watt hour meter body 5 to the infrared pickup 14 of the external terminal 7. Then, the received management information is temporarily stored in the memory of the external terminal 7, and then the stored management information is supplied to the computer by connecting the external terminal 7 to an external computer or the like. Thus, for example, information necessary for management of the electronic watt-hour meter can be collected accurately and easily compared to the case where management information is collected by operating a key provided on the watt-hour meter body. .

  As described above, according to the electronic watt-hour meter of the present embodiment, the display unit 4 divides the current measured value currently measured into two display modes (first display mode and second display mode). The first display state to be displayed cyclically and the measurement confirmation value to be confirmed at a predetermined date and time are divided into two display modes (first display mode and second display mode) and displayed second cyclically. Since it is configured to display the display state, it is possible to display the measurement information consisting of the current measurement value and the measurement final value in an easily viewable state, which facilitates reading of the measurement information. Since the first display state and the second display state are switched on the basis of a command from the external terminal 7 separated from the watt hour meter body 5, the measurement information can be transferred by remote control. Since it is possible to collect, and is excellent in operability of information collection.

  In addition, this invention is not limited to the said embodiment, In the range which this invention intends, implementation of a various form is possible. For example, in the above embodiment, the liquid crystal display plate 9 is used for the display unit 4, but other organic EL display plates can also be used. In addition, the watt-hour meter body 5 and the external terminal 7 communicate with each other via infrared pulses, but other radios can also be used.

  Further, in the first display state, the current measurement value is displayed in the first display mode for displaying the power amount by time zone, the time zone classification, the maximum demand power, and the current demand power, the force measurement active power amount and the force measurement invalidity. The second display mode is divided into the second display mode for displaying the electric energy, and in the second display state, the measurement final value is displayed as the first electric energy for each time zone, the time zone classification, the maximum demand power, and the accumulated maximum demand power. The display mode is divided into the second display mode that displays force measurement active energy, force measurement reactive energy, and power factor, but the measured value displayed in the first display mode and the second display mode is However, the method is not limited to the dividing method, and can be changed as necessary.

FIG. 1 is a block diagram of an electronic watt-hour meter according to an embodiment of the present invention. Fig.2 (a) is a top view which shows the state in which the display part of the electronic watt-hour meter exists in the 1st display mode of a 1st display state, FIG.2 (b) is the electronic watt-hour meter. It is a top view which shows the state in which the display part is in the 2nd display mode of a 1st display state. FIG. 3A is a plan view showing a state in which the display unit of the electronic watt-hour meter is in the first display mode of the second display state, and FIG. 3B is the electronic watt-hour meter. It is a top view which shows the state in which the display part is in the 2nd display mode of a 2nd display state. FIG. 4 is a plan view showing a state of the display unit when the electronic watt-hour meter is in a set state. FIG. 5 is a flowchart of the display process of the liquid crystal display panel of the electronic watt-hour meter. FIG. 6A is a plan view showing a state in which the display unit of the conventional electronic watt-hour meter is currently displaying a measured value, and FIG. 6B is a plan view of the electronic watt-hour meter. FIG. 6C is a plan view showing a state of the display unit when the electronic watt-hour meter is in a set state. FIG. .

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Voltage / current measuring means, 3 ... CPU (control means), 4 ... Display part, 5 ... Electricity meter main body, 7 ... External terminal (operation terminal), 8 ... Command supply means, 9 ... Display board (liquid crystal display) Board)

Claims (4)

A voltage / current measuring means for measuring voltage and current; a display section for displaying a measured value based on the voltage value and the current value; a control means for controlling the display section to display the measured value; A watt-hour meter main body provided with a command supply means for supplying a command to the control means, and provided separately from the watt-hour meter main body, and transmitting the input command to the command supply means by wireless In an electronic watt-hour meter comprising an operation terminal for operating the display state of the display unit via the control means, the display unit displays the current measured value currently measured, the electric energy for each time zone, and the time The first display mode and the first display mode are divided into a first display mode for displaying the band classification, the maximum demand power, and the current demand power, and a second display mode for displaying the force measurement active power amount and the force measurement reactive power amount. Cyclic 2 display mode A first display state to be displayed; a measurement confirmation value to be confirmed at a predetermined date and time; a first display mode for displaying a power amount by time zone, a time zone classification, a maximum demand power, and a cumulative maximum demand power; A second display mode in which the first display mode and the second display mode are cyclically displayed is divided by dividing the active power amount, the force measurement reactive power amount, and the power factor into the second display mode. In addition, the first display state and the second display state are switched based on the command from the operation terminal, and the display time of the first display mode of the first display state is the first display state. The display time is set longer than the display time of the second display mode, the display time of the first display mode in the second display state is set longer than the display time of the second display mode in the second display state, and the second Display of the first display mode of the display state The interval is set longer than the display time of the first display mode in the first display state, and the display time of the second display mode in the second display state is longer than the display time of the second display mode in the first display state. An electronic watt-hour meter configured to be set . Various data related to the current measurement value, the measurement confirmation value, and the watt hour meter are stored in a writable and rewritable nonvolatile memory provided in the watt hour meter body,
2. The electronic watt-hour meter according to claim 1, wherein the current metric value, the metric determination value, and various data are set and corrected in the nonvolatile memory by operating the operation terminal. . The power meter main body is provided with a transmission unit that transmits the current measurement value, measurement confirmation value, and various data to the operation terminal by operating the operation terminal,
The operation terminal may store the received current measurement value, measurement final value, and various data, and supply the stored current measurement value, measurement final value, and various data to an external electronic device. The electronic watt-hour meter according to claim 2, which is configured as follows. The display unit includes first to ninth display windows, and the first display window is a time-based power amount in the first display mode and a force measurement active power amount in the second display mode in the first display state or The time-based power amount in the first display mode in the second display state and the force measurement active power amount in the second display mode are displayed, and the second display window is the maximum in the first display mode in the first display state. The amount of power for demand or the maximum power demand in the first display mode in the second display state is displayed, and the third display window is in the time zone section in the first display mode in the first display state or in the second display state. The time zone classification in the first display mode is displayed, and the fourth display window is the force measurement reactive energy in the second display mode in the first display state or the force measurement invalid in the second display mode in the second display state. The amount of power is displayed, and the fifth display window is the first display Displays maximum accumulated consumed electric power in the first display mode in the current consumed electric power or the second display state in the first display mode in state, the sixth display window, in the first display mode in the first display state The power factor in the second display mode in the timed or second display state is displayed, and the seventh display window displays the power meter operating state in the first display mode in the first display state and the power in the second display mode. The operation state of the watt hour meter in the first display mode and the operation state of the watt hour meter in the second display mode in the operation state of the meter or the second display state are displayed, and the eighth display window is in the second display state. The measurement final value is displayed during the display, and the ninth display window displays the current time in the first display state or the measurement confirmation date in the second display state. The electronic watt-hour meter as described.