JP2005180934A - Electronic wattmeter - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic wattmeter which can deal with a variety of contract menus, which can easily collect information, and in which the collected information is also accurate. <P>SOLUTION: The electronic wattmeter, having a wattmeter body 5, provided with a voltage/current measurement means 1 for measuring voltage and current, and a transmission part 13 for transmitting to the outside the measured value, based on the measured voltage value and the current value, is provided with a display terminal 17 which is separately provided from the wattmeter body 5, which receives the measured value transmitted from the transmission part 13 to perform the conversion into information on the use condition of electric power, and which is constituted so as to be capable of displaying the information. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an electronic watt-hour meter.

  In recent years, revisions to the Energy Conservation Law, etc. have led to the liberalization of electricity retailing, and consumers have diversified contract menus (such as charge menus) for various power supplies from a single power generation company. In addition, there is a strong demand for a multi-functional electronic watt-hour meter that can handle metering (simultaneous same amount service) between a plurality of power generation suppliers.

  As a function required for such an electronic watt-hour meter, the power measured by the watt-hour meter is converted into information on the power usage status, specifically, information on the current power usage status and past usage results. In addition, there is a function capable of analyzing such information by statistical processing.

  However, existing electronic watt-hour meters do not have the functions described above. For example, a different watt-hour meter is used for each contract menu, and each time a new contract menu is introduced, the contract menu includes The development and installation of a watt-hour meter required a large amount of money, such as the need to develop a corresponding watt-hour meter.

  In addition, by simply adding the above-described functions to the watt-hour meter body, it is necessary to go to each place where the watt-hour meter is installed, which not only requires man-hours for collecting information but also lacks information accuracy. It tends to be a thing.

  The present invention has been made in view of the above-described problems, and can be used for various contract menus, can easily collect information, and enables electronic power to collect collected information accurately. The purpose is to provide a meter.

  An electronic watt-hour meter according to the present invention is a power provided with voltage / current measuring means for measuring voltage and current, and a transmitter for transmitting a measured value based on the measured voltage value and current value to the outside. An electronic watt-hour meter including a meter main body, provided separately from the watt-hour meter main body, receives the measurement value transmitted from the transmission unit, and converts it into information on power usage status, In addition, a display terminal configured to be able to display the information is provided.

  According to the electronic watt-hour meter, the measurement value is received and converted into information on the power usage status, and the information is displayed. It is easy to grasp the usage record, and the information is received, converted, and displayed on a display terminal provided apart from the watt hour meter body, so that information can be easily collected and collected. The information will be accurate.

  In the electronic watt-hour meter, the measured value is stored in a writable / rewritable non-volatile memory provided in the watt-hour meter main body, and the non-volatile memory from the watt-hour meter main body at predetermined time intervals. It is preferable that the measurement value is transmitted to the display terminal.

  According to the preferable configuration, the measured value is stored in the nonvolatile memory of the watt hour meter body, and the measured value in the nonvolatile memory is transmitted to the display terminal separated from the watt hour meter body at a predetermined time interval. Since it is configured, it becomes possible to collect measurement values on the display terminal automatically from the watt-hour meter main body and by remote control.

  In the electronic watt-hour meter, the measured value is stored in a rewritable and rewritable nonvolatile memory provided in the watt-hour meter body, and the display terminal is operated to operate the display terminal. It is preferable that the measurement value is configured to be transmitted to the display terminal.

  According to the preferable configuration, the measured value is stored in the nonvolatile memory of the watt hour meter main body, and the measured value in the nonvolatile memory is transmitted to the display terminal by operating the display terminal separated from the watt hour meter main body. Thus, the measurement value can be collected on the display terminal arbitrarily from the watt-hour meter main body and remotely.

  In the electronic watt-hour meter, the display terminal has an information storage unit for storing the received measurement value, and the stored measurement value can be converted into information on a power usage state. It is preferable that it is comprised.

  According to the preferable configuration, the display terminal has an information storage unit that stores the received measurement value, and is configured to be able to convert the stored measurement value into information on the power usage state. When necessary, it is possible to display information on the power usage status on the display terminal as necessary.

  As described above, according to the electronic watt-hour meter according to the present invention, it becomes easy for the consumer to grasp the current power usage status and past usage records, and therefore, it can handle various contract menus. In addition, the information on the power usage status is received and converted by a display terminal provided apart from the watt-hour meter body, so that it is easy to collect information and the collected information is also accurate. It will be a thing.

  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 measured value based on the voltage value and the current value, specifically, a currently measured current value and a predetermined date and time. A display unit 4 for displaying a measured final value to be determined, a CPU (Central Processing Unit) 3 for controlling the display unit 4 to display the measured value, and a command from the outside for the CPU 3 The watt-hour meter main body 5 provided with the command supply means 8 which supplies to 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. A crystal oscillation circuit 3b for supplying a reference clock signal for use, a reset circuit 3c, and a time zone segment selection jumper 3d are connected, and a measurement pulse for outputting a measurement pulse supplied from the W / F converter 2 to the outside An output circuit 22 is connected.

  The W / F converter 2 and the CPU 3 control the W / F converter 2 by the signal line 3 a for supplying the measurement pulse converted by the W / F converter 2 to the CPU 3, and the CPU 3 controls the W / F converter 2. It is connected to a signal line 2a that supplies a signal for reading out a pulse.

  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 configured to display the measurement value, that is, the current measurement value and the measurement confirmation value, by being controlled by the CPU 3. Specifically, the current measured value includes a power amount for each time zone, a time zone classification, a maximum demand power, a current demand power, a force measurement active power amount, and a force measurement reactive power amount. It includes power by band, time zone classification, maximum demand power, cumulative maximum demand power, force measurement active power amount, force measurement reactive power amount, and power factor.

  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.

  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 measurement value calculated by the CPU 3 based on the measurement pulse can be stored and read out. Is saved (sampled).

  The electronic watt-hour meter of the present embodiment receives an infrared pulse transmitted from the outside, and an infrared pickup 14 composed of a phototransistor that transmits an infrared pulse to the infrared receiver 8a of the command supply means 8. A repeater 16 is provided which is electrically connected to the infrared pickup 14 and wirelessly transmits / receives data corresponding to the infrared pulse to / from the outside.

  The watt-hour meter main body 5 is provided with a transmitter 13 for transmitting a measured value based on the voltage value and the current value measured by the voltage / current measuring means 1 to the outside. Specifically, the transmission unit 13 is connected to the CPU 3 and receives a current measurement value and a measurement final value, which are data to be transmitted, as modulation pulses from the EEPROM 12 via the CPU 3, and the modulation pulse is transmitted to an infrared ray. And an infrared LED 13b that converts the pulse into an infrared pickup 14 and transmits it to the infrared pickup 14. A so-called photocoupler is formed by the infrared LED 13b and the infrared pickup 14, and the watt-hour meter body 5 and the infrared pickup 14 are connected by a circuit that transmits a signal according to a change in current, and can communicate with each other. It has become.

  The electronic watt-hour meter of the present embodiment is provided separately from the watt-hour meter main body 5, receives the measured value transmitted from the transmitter 13 and converts it into information on the usage status of power, A display terminal 17 configured to display the information is provided. A block diagram of the display terminal 17 is shown in FIG. The display terminal 17 shown in FIG. 2 receives the measurement value transmitted by the weak radio from the display unit 31 that displays information on the usage state of power and the repeater 16 of the watt hour meter body 5, and A receiving unit 32 that transmits a command by weak radio, an operation input unit 34 that manually inputs a command and various data for operating the watt-hour meter body 5 and the display terminal 17 itself, and a measurement received by the receiving unit 32 An information storage unit (memory) 35 that stores data related to values (hereinafter referred to as measurement data), and the measurement data is extracted from the information storage unit 35, and the measurement data is calculated and converted into information about the usage status of power. An information control unit 33 that controls the reception unit 32 and the operation input unit 34 as well as the display unit 31, the reception unit 32, the information control unit 33, the operation input unit 34, And a power supply unit 36 supplies driving power to the micro-information storage unit 35.

  Hereinafter, the operation of the electronic watt-hour meter of this embodiment will be described. The W / F converter 2 of the watt-hour meter body 5 converts the voltage value and current value measured by the voltage / current measuring means 1 into a measurement pulse proportional to the amount of power obtained by calculating the 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.

  In this state, the measured value in the EEPROM 12 is transmitted from the watt-hour meter body 5 to the display terminal 17 at predetermined time intervals. Specifically, the EEPROM 12 is controlled by the CPU 3, and the current measurement value and the measurement confirmation value stored in the EEPROM 12 at the time of power failure and measurement determination are transmitted to the transmission unit 13 via the CPU 3 as modulation pulses at predetermined time intervals. Then, the modulation pulse is converted into an infrared pulse by the logic circuit unit 13 a of the transmission unit 13 and transmitted from the infrared LED 13 b to the infrared pickup 14. Next, the infrared pulse sent from the infrared pickup 14 to the repeater 16 is converted into weak radio by the repeater 16 and transmitted to the display terminal 17.

Then, the weak radio is received by the reception unit 32 of the display terminal 17, and measurement data corresponding to the current measurement value and the measurement confirmation value is stored in the information storage unit 35. The measurement data stored in the information storage unit 35 is sent to the information control unit 33 at predetermined time intervals, and the information control unit 33 calculates and converts it into information on the power usage status and displays it on the display unit 31. Is done. Specifically, the measurement data is graphed over time within a given period, or the ratio of the previous day and today, the previous month and this month, the previous year and this year's power consumption and electricity charges is calculated based on the measurement data. For example, information useful in the management of electrical energy usage required by the Energy Conservation Law (for example, comparison with the target value of maximum power, conversion of power consumption to CO ₂ (carbon dioxide) emissions) ) And displayed on the display unit 31.

  As described above, according to the electronic watt-hour meter of the present embodiment, since it is configured to receive the measured value and convert it into information on the usage state of the power, the consumer uses the current power It becomes easy to grasp the usage status and past usage record of the product, and it becomes possible to deal with various contract menus. In addition, since the information on the usage status of power is received, converted, and displayed on the display terminal 17 provided apart from the watt hour meter body 5, the information can be easily collected and collected. Information is also accurate.

  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.

  In the electronic watt hour meter of the above embodiment, the display terminal 17 is configured to transmit the measured value in the EEPROM 12 from the watt hour meter body 5 at predetermined time intervals. However, the electronic watt hour meter of the present invention is It is not limited to this, You may comprise so that the measurement value in the EEPROM 12 may be transmitted to the display terminal 17 by operating the display terminal 17.

  Specifically, when an instruction for transmitting an infrared pulse corresponding to the measurement value is input from the watt-hour meter body 5 to the operation input unit 34 of the display terminal 17, the instruction is relayed via the reception unit 32. 16 is transmitted to the infrared pickup 14 from the repeater 16, and an infrared pulse corresponding to the command is received by the command supply means 8. Then, the CPU 3 is operated based on the command, and the current measurement value and the measurement confirmation value stored in the EEPROM 12 at the time of power failure and measurement confirmation are transmitted to the transmission unit 13 via the CPU 3 as modulation pulses at predetermined time intervals. . Next, the modulation pulse is converted into an infrared pulse by the logic circuit unit 13a of the transmission unit 13 and transmitted from the infrared LED 13b to the infrared pickup 14, and the infrared pulse transmitted from the infrared pickup 14 to the repeater 16 is relayed. It is converted into weak radio by the device 16 and transmitted to the display terminal 17. In the same manner as in the above embodiment, the information control unit 33 of the display terminal 17 converts the information into information related to the power usage status, that is, the information is processed into information useful for managing the usage status of electric energy, and the display unit 31 Will be displayed.

  Moreover, in the electronic watt-hour meter of the said embodiment, although the display terminal 17 and the repeater 16 were communicated by radio | wireless, it is also possible to communicate using a conductive wire.

FIG. 1 is a block diagram of an electronic watt-hour meter according to an embodiment of the present invention. FIG. 2 is a block diagram of a display terminal of the electronic watt-hour meter.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Voltage / current measuring means, 5 ... Electricity meter main body, 8 ... Command supply means, 17 ... Display terminal

Claims (4)

An electronic watt-hour meter comprising a watt-hour meter body provided with a voltage / current measuring means for measuring voltage and current and a transmitter for transmitting a measured value based on the measured voltage value and current value to the outside There,
Provided separately from the watt-hour meter main body, configured to receive the measured value transmitted from the transmission unit, convert the measured value into information related to power usage, and display the information. An electronic watt-hour meter comprising a display terminal. The measured value is stored in a writable and rewritable nonvolatile memory provided in the watt hour meter body,
The electronic watt-hour meter according to claim 1, wherein the metric value in a nonvolatile memory is transmitted from the watt-hour meter main body to the display terminal at predetermined time intervals. The measured value is stored in a writable and rewritable nonvolatile memory provided in the watt hour meter body,
The electronic watt-hour meter according to claim 1, wherein the measured value in the nonvolatile memory is transmitted to the display terminal by operating the display terminal.   The said display terminal has an information storage part which memorize | stores the received said measured value, and it is comprised so that the stored said measured value can be converted into the information regarding the usage condition of electric power. Electronic watt-hour meter according to any one of the above.