KR100207008B1 - Electronic watt hour meter and its integration and tou reservation method - Google Patents

Abstract

The present invention relates to an electronic electricity meter, an integration and a TOU reservation method. Conventionally, when the TOU itself is changed by using a complex TOU, the TOU itself changes, that is, seasonal / daily / applied to the TOU. When the hourly setting is changed, the applied time is set and operated at the time of programming the TOU. Also, the corrected / changed TOU should be raised at the exact time of the application, but it is precisely changed at the time of application by maintaining a single TOU. There is a problem in that accurate measurement of power energy over time is impossible using the modified TOU. Therefore, the present invention uses a TOU structure having a performing TOU and a reserved TOU to reserve the electronic electricity meter before the time of modification and change of the TOU, and the reserved TOU operates at an accurate time of application, thereby real time zone (TARIFF). It is possible to measure the power energy per unit, and the TOU change of each electronic watt-hour meter is applied before the application date and the application is applied exactly at the change date, so that the temporal error and the time-phase power energy error are eliminated.

Description

Electronic electricity meter and its integration and TOU reservation method

The present invention relates to an electronic wattmeter for measuring electrical energy used in factories, houses, buildings, and the like, and in particular, an electronic wattmeter that enables real-time application to a change in a time zone (TARIFF) to be applied and minimizes time and computational errors. It relates to integration and TOU reservation method.

The block configuration of the conventional electronic wattmeter includes a power supply circuit section 11 for supplying power to each required section, as shown in FIG. An input converter 12 which drops down to a predetermined low voltage and a low current of a high voltage and a high current supplied from a power supply side; A power / frequency converter (13) for multiplying the voltage and current transmitted from the input converter (12) to obtain power and converting the power to a frequency proportional to the power; The digital circuit section 14 divides the frequency of the power / frequency converting section 13 at a suitable time period and displays the accumulated amount of used power on the display section 10.

Looking at the prior art configured in this way in detail as follows.

A wattmeter is a device that calculates how much electrical energy supplied from a power supply company is used on a load side. The development of this device has evolved from a mechanical wattmeter to an electronic wattmeter, which requires versatility, light weight, and high precision.

Referring to the conventional electronic watt-hour meter, the power transformer 1 of the power circuit unit 11 receives the AC power from the power supply side and drops the voltage to a predetermined voltage that can be rectified in the power supply circuit 2. DOWN) to apply to the power supply circuit (2).

Accordingly, the power supply circuit 2 supplies the DC power generated by rectifying the voltage dropped voltage to each of the necessary parts.

At this time, the power failure compensator 3 serves to compensate for power failure by using the battery to maintain the weighing data and various setting parameters stored in the volatile memory during power failure.

The instrument transformer 4 and the current transformer 5 of the input converter 12 are converted into a voltage and a current of several volts and output.

For example, 220 volts (V), 30 amps (A), 60 hertz (Hz) electrical energy is input, the ratio of the instrument transformer (4) is M: 1, the ratio of the current transformer (5) is N: In the case of 1, the instrument transformer 4 drops the voltage to M: 1 to make 1 / M volts, and the current transformer 5 detects the current at 1 / N and outputs it to the power / frequency converting unit 13. do.

As a result, the multiplier 6 of the power / frequency converter 13 multiplies the voltage and current signals, and then modulates the pulse width to output the frequency converter 7.

The frequency converter 7 converts a pulse width modulated signal proportional to the power output from the multiplier 6 into a frequency and outputs the frequency to the digital circuit unit 14.

When the divider 8 of the digital circuit unit 14 divides the frequency signal inputted from the frequency converter 7 at regular time intervals and outputs the result to the accumulator 9, the accumulator 9 is shown in FIG. After accumulating pulse data in accordance with a tariff, the display unit 10 displays the accumulated power so that the user can know the amount of accumulated power.

The internal structure of integration in accordance with the time of use (TOC) in the integrator 9 will be described with reference to FIG. 2 as follows.

TOU 61 is represented by 24 season start and season type, which means the season start date, form is month / day as 2 bytes BCD (Binary to Degit), and season type is 62 seasons. One of the varieties. The form is a one-byte BCD (value: 1-4) and each season is used to represent one week.

Each weekday / weekday type 63 shows up to 3 types of weekdays, and weekdays up to 2 types.

Weekday 1 is displayed as 16 hours, weekday 2 as 8 hours, weekday 3 as 8 hours, holiday 1 as 8 hours, holiday 2 as 4 hours, and the start time indicates the start time to apply the time zone. Minute (2 bytes BCD), where time zone meaning is the type of ariff to which each application time applies, and the format is 1 byte ASCII (value: AE).

Referring to FIG. 3, a process of actually measuring the above-described TOU by applying the above-described TOU is first checked whether the time of the RTC (Real Time Clock) of the electronic electricity meter is changed (S1).

As a result of the check, if there is no change in time, the accumulated pulse value is accumulated in the current time period (Triff) (S9), and if there is a change, it is checked whether the daily change of the RTC occurs in the same way (S2).

If there is a day change in step S2, check whether the same as the season start date of the TOU (S3).

If it is the same as the season start date in step S3, select the season type to which the season change is applied (S4), and select the weekday / weekday type corresponding to the current day of the RTC from the selected season type 12 (S5). A time zone corresponding to the current time is selected from the weekday / weekday type (S7).

After step S7, the current pulse value is accumulated (S8), the accumulated pulse value is accumulated in the current time zone (TARIFF) (S9), and step S1 is repeatedly performed.

Through the same process as described above, it is possible to measure each time zone (TARIFF).

However, in the prior art as described above, the electronic electricity meter performs the integration for each time zone (TARIFF) using a complex TOU, but if the TOU itself changes, that is, the seasonal / daily / hourly setting applied to the TOU is changed. In this case, there is a problem that the applied time is set and operated at the time of programming the TOU, and the corrected / modified TOU must raise the correct TOU at the time of application, but by maintaining a single TOU, the corrected TOU is changed. There is a problem that it is impossible to accurately measure the power energy over time.

Accordingly, an object of the present invention for solving the conventional problems as described above is to reserve in the electronic electricity meter before the time of applying the TOU when modifying and changing the time of use (TOU), the reserved TOU is operated at the correct application time The present invention provides an electronic electricity meter that enables measurement of power energy for each time zone (TARIFF) in real time.

1 is a block diagram of a conventional electronic electricity meter.

FIG. 2 is a structure diagram of a time of use (TOU) in FIG. 1; FIG.

3 is an integration flowchart of a conventional electronic wattmeter.

4 is a structure of the time of use (TOU) of the present invention.

5 is a flowchart illustrating an operation of accumulating and TOU reservation of the electronic watt-hour meter of the present invention.

6 is a circuit diagram of the electronic watt-hour meter of the present invention.

FIG. 7 is a block diagram illustrating functional units of CFI oil in FIG. 6.

* Explanation of symbols for main parts of the drawings

24: oscillation unit 25: power calculation unit

27: CPI 28: LCD

29: communication port 31: RAM

40: current signal converter 50: voltage converter

The integration and TOU reservation method of the electronic watt-hour meter of the present invention for achieving the above object, as shown in Figure 5, the first step of checking whether the time change of the Real Time Clock (RTC); A second step of checking whether a change in the RTC occurs in the same manner if there is a time change in the first step; A third step of checking whether the current is the same as the scheduled execution date if the day change has occurred in the second step and replacing the performed TOU with the reserved TOU if it is identical and checking if it is the same as the season start date of the performed TOU if it is not identical; A fourth step of selecting a corresponding season type and a corresponding day of the season type, and selecting a weekday / weekday type corresponding to the current day of the RTC if the season start date of the TOU performed in the third step is the same; The fifth step of calculating the amount of power by selecting the time zone (TARIFF) corresponding to the current time in the weekday / week type selected in the fourth step, and then accumulate the current accumulated cumulative pulse value.

The configuration of the electronic watt-hour meter of the present invention for performing the method consisting of the above steps comprises: a power supply (1) for supplying direct current (DC) power to each of the necessary parts, as shown in FIG. A current signal converter 40 for converting and outputting a small voltage signal proportional to the current flowing in each phase of the supply side L1, L2, L3; A voltage converter (50) for outputting a minute voltage signal proportional to the voltage of each phase of the supply side (L1, L2, L3); The power is calculated by multiplying the current and the voltage of each phase supplied from the current signal converter 40 and the voltage converter 50, and the energy used in the three phases is calculated by adding the calculated power of each phase and calculating the power. A power calculator 25 for outputting a pulse signal having an arbitrary frequency proportional to the energy applied thereto; An oscillator 24 for providing a clock for the operation of the internal circuits of the power calculator 25; CPI 27 for recognizing the signal received from the power calculation unit 25 and controlling the LCD 28 to display the amount of power used; A ROM 30 for storing program data; A RAM 31 for storing data related to the metered power amount; A signal output unit 32 for outputting a signal when necessary in the CPI 27; The oscillation unit 33 is attached to the CPI 27 so as to serve as a master clock inside the CPI 27. Reference numeral 29 in the above description is a communication port.

And, the CPI 27, as shown in Figure 7, the TOU setting unit 271 for storing the current TOU and the reservation TOU data input through the communication port 29 in the RAM 31; A reservation confirmation unit (272) for reading data from the RAM (31) and checking whether or not it is a scheduled reservation; A TOU changing unit 273 for performing a task for changing or newly setting a TOU; The pulse accumulator 274 calculates and accumulates pulses for each TOU.

Referring to the operation and effect of the present invention configured as described in detail as follows.

In Fig. 6, when the supply side supplies power to the load side through L1, L2, and L3, the power supply 1 receives AC power and converts it into DC power to supply each necessary component.

At this time, the primary side (8, 10, 12) of the first current transformer to the third current transformer (2 to 4) of the current signal conversion unit 40, if the current is supplied from each phase of the supply side L3, L2, L1 secondary side ( 9, 11 and 13 are induced with a voltage of a few mV to several hundred mV proportional to the current flowing on the primary side and output to the terminal resistors 20 to 22.

The voltage induced in the termination resistors 20 to 22 is input to the current signal input terminals IRP and IRN (ISP and ISN) ITP and ITN of the power calculator 25.

At this time, the input resistors 14, 16 and 18 of the first to third resistor voltage dividers 5 to 7 of the voltage converter 50 are connected to the supply side LL3, L2 and L1, and the termination resistors 15, 17 and 19 are provided. Is common to the supply side N, and detects a small voltage from the supply side and supplies it to the voltage signal input terminals V3, V2, and V1 of the power calculation unit 25.

As described above, the power calculator 25 receiving the current signal and the voltage signal receives the clock for the operation of the internal circuits from the oscillator 24.

Therefore, the power calculation unit 25 receives the current signal from the current signal converter 40 and the three-phase voltage from the voltage converter 50 to multiply each phase to calculate the power, these three phases Sum the powers to find the energy used in the three phases.

When a pulse signal having an arbitrary frequency proportional to the energy thus obtained is output to the CPI 27, the CPI 27 controls the LCD 28 to be displayed to a customer.

In the present invention, the time of use (TOU) structure is divided into a performance TOU64 and a reservation TOU65, as shown in FIG.

TOU 64 performed in the above is a TOU identification number 66a having an 8-byte (ASCII) structure, a current TOU (61a) consisting of a season start and a season type, a current season type (62a), and a current weekday / weekday type (63a). The reservation TOU 65 is reserved in the same structure as the TOU identification number (66b), the reservation TOU (61b), the reservation season type (62b), and the reservation week / weekday type (63b). It further includes a scheduled execution date 67 having time for the contents to be applied.

The scheduled execution date is composed of three bytes to represent the year, month, and day, and is in the form of a BCD.

Referring to FIG. 5, a process for enabling real-time application according to a change in a time zone (TARIFF) that is actually measured or applied by applying the above-described TOU is described. First, CPI 27 is an RTC (Real Time Clock) of an electronic electricity meter. It is checked whether the time is changed (S11).

As a result of the check, if there is no time change, the process proceeds to step S20 and the accumulated pulse value is accumulated in the current tariff (S20), and if there is a change, it is checked whether the daily change of the RTC occurs in the same way. (S12).

If there is a day change in step S12 it is checked whether or not the same as the scheduled execution date (S13).

If it is not the same as the scheduled execution date in step S13, it is checked whether the same as the season start date of the TOU (S14).

If it is the same as the season start date in step S14, select the season type to which the season change is applied (S15), and select the weekday / weekday type corresponding to the current day of the RTC from the selected season type 12 (S16). A time zone corresponding to the current time is selected from the weekday / weekday types (S17), and the selected time zone is applied (S18).

As in step S18, the current pulse value is accumulated by applying the time zone (S19), the accumulated pulse value is accumulated in the current time zone (TARIFF) (S20), and the step S11 is repeatedly performed.

Through the same process as described above, it is possible to measure each time zone (TARIFF).

When the TOU is changed and the reserved TOU is input through the communication port 29 of FIG. 6 while repeating the above operation, the TOU is received by the TOU setting unit 271 of the CPI 27 and stored in the RAM 31.

Then, the TOU change unit 273 changes the reserved TOU stored in the RAM 31.

In the changed state, in the flowchart of FIG. 5, the TOU reservation confirmation unit 272 confirms whether the same as the scheduled execution date after the day change in step S13, and if the same is the case, replaces the performed TOU with the reserved TOU as in steps S21 to S23. .

After the replacement operation is completed, select a season type to which the current season change is applied (S15), and select a weekday / weekday type corresponding to the current day of the RTC from the selected season type 12 (S16), and then apply the weekday / weekly type to be applied. A time zone corresponding to the current time is selected from among (S17), and the selected time zone is applied (S18).

As in step S18, the current pulse value is accumulated by applying the time zone (S19), and the accumulated pulse value is accumulated by the pulse integration unit 274 in the current time zone (TARIFF) (S20). If the data is stored in the LCD 28 and displayed on the LCD 28, the integrated pulse value is read from the RAM 31 and recognized, and then the LCD 28 is controlled and displayed.

As a result, when the TOU is modified and changed, a reservation is made to the electronic electricity meter before the time point of application, and the reserved TOU is operated at the correct time of application, thereby enabling power energy measurement for each time zone (TARIFF) in real time.

In addition, since the TOU change of each electronic watt-hour meter is applied before the application time point and applied correctly at the time point of change, the temporal error and the time-phase power energy error can be eliminated.

As described above, the present invention doubles the execution TOU and the reservation TOT structure for TOU reservation in the totalizer, and replaces the reserved TOU values with the execution TOU values on the execution reservation date, and the replaced TOUs are corrected at the correct application time. By operating, it is possible to measure power energy at each time zone in real time, and has an effect of eliminating temporal error and power energy error at each time zone.

Claims (8)

A power supply for supplying direct current (DC) power to each required part; A current signal converter for converting and outputting a minute voltage signal proportional to the current flowing in each phase of the supply side L1, L2, L3; A voltage converter which outputs a minute voltage signal proportional to the voltage of each phase of the supply side L1, L2, L3; The power is calculated by multiplying the current and the voltage of each phase supplied from the current signal converter and the voltage converter, and calculating the energy used in the three phases by summing the calculated powers of the respective phases, which is proportional to the calculated energy. A power calculator for outputting a pulse signal having a frequency of; An oscillator for providing a clock for the operation of the internal circuits of the power calculator; CPI for integrating the signal received from the power calculation unit in the current time zone (TARIFF) by using the TOU and display the accumulated power amount on the LCD; A ROM for storing program data; RAM for storing data related to the measured amount of power; A signal output unit for outputting a signal if necessary in the CPI; And an oscillation unit attached to the CPI to serve as a master clock inside the CPI. The system of claim 1, wherein the CPI comprises: a TOU setting unit configured to store data of a current TOU and a reserved TOU input through a communication port in a RAM; A reservation confirmation unit which reads data from the RAM and checks whether a reservation is to be performed; A TOU change unit for performing a task for changing or newly setting a TOU; Electronic watt-hour meter comprising a pulse integrator that accumulates and calculates pulses per TOU. The electronic power meter according to claim 1, wherein the current signal converter comprises a predetermined current transformer for converting the current of each phase into a minute voltage. The electronic watt-hour meter of claim 1, wherein the voltage converter comprises a predetermined resistor voltage divider comprising an input resistor for receiving each phase voltage and a termination resistor for outputting the received voltage. The electronic electricity meter according to claim 1, wherein the time of use (TOU) comprises a performing TOU for performing the TOU and a reserved TOU for reserving the TOU. The electronic watt-hour meter according to claim 5, wherein the performing TOU comprises a TOU identification number, a current TOU, a current season type, and a current weekday / weekly type. The electronic power meter of claim 5, wherein the reservation TOU comprises a TOU identification number, a reservation TOU, a reservation season type, a reservation weekday / weekday type, and an execution reservation date. A first step of checking whether the RTC changes in time; A second step of checking whether a change in the RTC occurs in the same manner if there is a time change in the first step; A third step of checking whether the current is the same as the scheduled execution date if the day change has occurred in the second step and replacing the performed TOU with the reserved TOU if it is identical and checking if it is the same as the season start date of the performed TOU if it is not identical; A fourth step of selecting a corresponding season type and a corresponding day of the season type, and selecting a weekday / weekday type corresponding to the current day of the RTC if the season start date of the TOU performed in the third step is the same; And a fifth step of calculating the amount of power by selecting a time zone (TARIFF) corresponding to the current time in the weekday / weekday type selected in the fourth step, and then integrating the currently accumulated pulse value in the time zone selected above. How to accumulate electronic electricity meters and reserve TOUs.

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