JP3642185B2 - Separate electronic energy meter - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a separation-type electronic watt-hour meter that measures the amount of electric power whose electric power unit price varies depending on the usage hours of electric power. At present, a part of the information is provided to consumers as information on power management. The time zone type or demand time limit is output to the consumer as a time zone identification signal or time signal.
[0002]
[Prior art]
FIG. 4 is a block diagram of a conventional electronic watt-hour meter, display device, and power management system. In the figure, 1 is an electronic watt-hour meter, 1a is a voltage / current input terminal from the power metering circuit, 11 is a power proportional to the amount of power by calculating the voltage and current input to the voltage / current input terminal 1a. An electric energy calculation unit that generates an amount pulse train, 12 is a clock unit, 13 is a demand time period generation unit that generates a demand time period required for measuring the maximum demand power within a predetermined time period (for example, 30 minutes) from the clock unit 12, and 14 An arithmetic processing unit that inputs the power amount pulse train from the power amount calculation unit 11 and the time information from the demand time period generation unit 13 and calculates and measures the power amount and the maximum demand power in the demand time period from the demand time period generation unit 13 , 15 is a display unit that displays the amount of electric power and the maximum demand power calculated by the arithmetic processing unit 14, 16 is a measurement data output unit that outputs various measurement data measured by the arithmetic processing unit 14 to the outside, and 1b is measurement data Out The weighing data signal output from the section 16 is an output terminal for connection to an external. 1 c is a pulse train terminal for taking out a pulse train of the electric energy calculation unit 11.
[0003]
Reference numeral 2 denotes a display device that displays the weighing data output from the electronic watt-hour meter 1 by time zone. 2a is an input terminal, 21 is a measurement data input unit for receiving measurement data from the electronic watt-hour meter 1 input from the input terminal 2a, 22 is a calendar clock for measuring time, and 23 is a predetermined supply and demand calendar. Accordingly, a time zone information storage unit for storing the measurement time zone according to day of the week, time, etc., 24 is a time zone switching unit for discriminating the measurement time zone from the current date / time information of the calendar clock unit 22, and 25 is time zone switching. Based on the time zone information from the unit 24, the weighing data input via the weighing data input unit 21 is distributed to the corresponding time zone and the weighing unit by time zone, 26 is the power amount by time zone and the time A display unit for displaying measurement data such as the maximum demand power for each band, 27 is a time zone identification signal output unit for outputting the current time zone information from the time zone switching unit 24 in a format that can be identified, and 28 is a calendar. A timed signal output unit for outputting the Zehnder clock unit 22 timed signal demand timed (e.g. 30 minutes) to the outside. 2b is a time zone identification signal output terminal, and 2c is a time limit signal output terminal.
[0004]
Reference numeral 3 denotes a power management device of a consumer such as a demand controller, a power factor adjustment device, and a daily power report creation device. The electronic watt-hour meter 1 and the display device 2 are owned by an electric power company, the electric energy pulse train generated by the electric energy calculator 11, the current time zone information from the time zone switching unit 24, and the timed signal output unit. The demand time signal from 28 is lent to a consumer and used as an information source for the power management device 3 of the consumer.
[0005]
Next, the operation will be described. In the electronic watt-hour meter 1, the measuring unit 11 multiplies the voltage / current of the power-receiving metering circuit to convert it into a pulse train proportional to the power amount, and measures the power amount (total daily power amount) in a single time zone. The power measurement value is displayed on the display unit 15. In the measurement of the maximum demand power, for example, the demand time generation unit 13 generates a demand time pulse by setting the demand time as the demand time from the clock unit 12 as the demand time (**: 00:00) and 30 minutes (**: 30). 30 minutes) and the maximum demand power value is displayed on the display unit 15. The power amount pulse train is transmitted to the power management device 3 via the signal line, and the power measurement value and the maximum demand power value displayed on the display unit 15 are input from the measurement data output unit 16 to the measurement data of the display device 2. Is transmitted to the unit 21.
[0006]
In the display device 2, for example, a time signal is output to the hourly metering unit 25 with the time of the current hour (**: 00:00) and 30 minutes (**: 30) as the time limit, and the time point is output to the electronic watt-hour meter 1. The data request of the electric energy value or the maximum demand electric power value is made. The electric power measurement value received by the measurement data input unit 21 is identified as a measurement value between the previous time period and the current time period according to a predetermined supply and demand calendar, and is calculated as a measurement value between the previous time period and the current time period. The maximum demand power value is distributed and measured and displayed on the display unit 26.
Further, the time zone information from the time zone switching unit 24 is provided to the outside via the time zone identification signal output unit 27. The timed pulse generated by the timed signal output unit 28 is provided to the outside via the output terminal 10.
[0007]
[Problems to be solved by the invention]
In the conventional configuration as described above, the weighing data displayed on the display unit 15 of the electronic watt-hour meter 1 and the display device 2 are transferred by passing the weighing data between the electronic watt-hour meter 1 and the display device 2. Although the values displayed on the display unit 26 match, the time signal or time zone identification signal provided to the consumer is generated independently from the calendar clock 22 of the display device 2, so that the clock of the electronic watt-hour meter 1 It was not possible to have consistency (synchronization) with the timekeeping.
[0008]
For this reason, when the consumer manages the power consumption by time zone and the maximum demand power by time zone using the time signal or time zone identification signal output from the display device 2, the timing or time zone of the demand time limit The display data of the display device 2 and the measured value in the consumer's power management device 3 did not always match due to the shift of the switching timing.
As a result, there was a problem that the trading instrument was distrustful and caused trouble.
[0009]
The present invention has been made in order to solve the above-described problems, and completes the temporal coincidence (synchronization) of the time signal and the time zone identification signal provided to the electronic watt-hour meter 1, the display device 2, and the customer. It is an object of the present invention to provide a separation-type electronic watt-hour meter that allows the consumer side to achieve accurate power management.
[0010]
[Means for Solving the Problems]
The separation-type electronic watt-hour meter according to the present invention includes a time zone switching information storage unit that stores time zone switching information corresponding to a supply and demand calendar in a display device, and a calendar clock that performs timekeeping, from the current time of the calendar clock. Means for specifying in advance the time zone type at the time when an arbitrary time is advanced from the time zone switching information storage unit, and the time zone identification signal specified in advance in synchronization with the demand timed pulse signal from the electronic watt-hour meter Means for outputting to the outside.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a block diagram of an electronic watt-hour meter, a display device, and a power management system according to Embodiment 1 of the present invention. In the figure, reference numerals 1a to 1c, 2a to 2c, 3, 11 to 16, and 21 to 28 are the same as those described above for the conventional apparatus. 10 is an electronic watt-hour meter, 10d is a time signal output terminal, and 17 is a time signal output unit. Reference numeral 20 denotes a display device, 20d denotes a time signal input terminal, and 29 denotes a time zone synchronization unit. The clock unit 12 and the calendar clock 22 are compensated for power failure.
[0012]
The display device 20 measures the amount of electric power with a different unit price for each power usage time zone from the current time by the calendar clock 22 in accordance with a supply and demand calendar predetermined in the time zone information storage unit 23. A demand time limit pulse signal for measuring the amount of power used within a predetermined time (demand time limit 30 minutes) is generated by the demand time limit generation unit 13 of the electronic watt-hour meter 10 and is sent from the time limit signal output unit 17 to the time limit signal output terminal 10d. , And input to the time zone synchronization unit 29. The time zone synchronization unit 29 synchronizes the time zone switching command and the demand timed pulse signal in the calendar clock 22 by the method described later, and provides it to the power management equipment 3 of the external consumer via the time zone identification signal output unit 27. To do. Further, a demand timed pulse signal from the electronic watt-hour meter 10 is also provided from the timed signal output unit 28 to the external power management device 3.
[0013]
FIG. 2 is a flowchart for explaining the synchronization of the time zone switching command of the time zone synchronization unit and the demand timed pulse signal in the present invention. One demand timed pulse signal is input to the time zone synchronization unit 29 every 30 minutes, and supply / demand calendar information in the time zone information storage unit 23 is input from the calendar clock 22. The time zone synchronization unit 29 searches the time zone of the supply and demand calendar in the time zone information storage unit 23 at a time (a time one minute earlier) obtained by adding a certain time (for example, 1 minute) to the current date / time of the calendar clock 22. To prepare for output of the time zone identification signal corresponding to the time. In synchronization with a demand timed pulse signal input by a latch circuit, for example, a time zone switching command to the time zone switching unit 24 and a time zone identification signal are output to the outside via the time zone identification signal output unit 27. Is done. Further, the demand timed pulse signal is branched and simultaneously output from the timed signal output unit 28 to the outside.
[0014]
FIG. 3 is a timing chart for explaining the synchronization of the time zone switching command of the time zone synchronization unit and the demand timed pulse signal in the present invention.
As an example of the supply and demand calendar of the time zone switching information storage unit 23,
(1) The second time zone is from 08:00 to 09:00,
(2) 09:00 to 11:00 in the fourth time zone,
(3) It is a timing chart in the case where 10:00 to 12:00 is the fifth time zone demand time limit being 30 minutes and the time zone identification preceding time is 1 minute. From the watt-hour meter 20, the demand timed pulse signal is **: 30 or **: 30 every 30 minutes, 08:30, 09: 0, 09:30,. . . It will be sent at 11:00. On the other hand, the time zone synchronizer switches from the second time zone to the fourth time zone at 08:59 in order to specify search time switching one minute ahead of the current time. Switch from time zone 4 to time zone 5.
By latching to the time zone type specified in advance at the rising timing of the input demand timed pulse signal, only the corresponding time zone output is turned on, the other time zone outputs are turned off, and the time zone that identifies the time zone An identification signal is output.
[0015]
【The invention's effect】
As described above, the time zone identification signal can be synchronized with the demand time period pulse signal output from the watt hour meter, and the demand time period of the watt hour meter, the time zone switching process of the display device, the time zone provided to the consumer All of the identification signal and the timed signal output can obtain temporal consistency.
[Brief description of the drawings]
FIG. 1 is a block diagram of an electronic watt-hour meter, a display device, and a power management system according to Embodiment 1 of the present invention.
FIG. 2 is a flowchart for explaining synchronization of a time zone switching command and a demand timed pulse signal of a time zone synchronization unit according to the present invention.
FIG. 3 is a timing chart illustrating the synchronization of a time zone switching command and a demand timed pulse signal of a time zone synchronization unit in the present invention.
FIG. 4 is a block diagram of a conventional electronic watt-hour meter, display device, and power management system.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1,10 Electronic watt-hour meter, 2,20 Display apparatus, 3 Power management apparatus 11 Electric energy calculation part, 12 Clock part, 13 Demand time generation part 14 Operation processing part, 15 Display part, 17 Time signal output part 22 Calendar Clock, 23 time zone information storage unit 24 time zone switching unit, 25 time zone measurement unit, 26 display unit 27 time zone identification signal output unit, 28 time signal output unit 29 time zone synchronization unit

Claims (1)

It consists of an electronic watt-hour meter that combines the measurement of the amount of power in a single time zone and the measurement of maximum demand power, and a display device that sorts and displays each time zone based on the measurement data obtained by the electronic watt-hour meter. In a separate electronic watt-hour meter,
The electronic energy meter is a timed signal output unit that outputs a demand timed pulse signal synchronized with a demand timed required for maximum demand power measurement,
The display device includes a time zone switching information storage unit that stores time zone switching information corresponding to a supply and demand calendar, and a calendar clock that performs timekeeping,
Means for specifying in advance from the time zone switching information storage unit the time zone type at which an arbitrary time is advanced from the current time of the calendar clock;
A separation-type electronic watt-hour meter comprising means for outputting the preceding designated time zone identification signal to the outside in synchronization with a demand timed pulse signal from the electronic watt-hour meter.

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