KR0157646B1 - Maximum demand power returing method of watt hour meter - Google Patents

Abstract

The present invention relates to a method of returning the maximum demand power meter of the power supply and demand multi-function meter, when the user turns on the maximum demand power return switch of the control panel or when 00 00 00 of the scheduled meter reading or 00 00 00 of the metering date The cumulative power amount of the power meter and the accurate power meter for power factor measurement, the cumulative power amount in the power factor measurement time period, the cumulative reactive power amount and the maximum demand power value of the maximum demand power meter are reset to zero.

Description

How to Return the Maximum Demand Power Meter for Power Supply Complex Meter

1 is a block diagram showing the overall configuration of the present invention.

2 is a front view showing the display portions of the present invention.

(a) is a front view showing the current display state.

(b) is the front view which shows the display state of the meter reading day.

3 is a flowchart showing the operation of the present invention.

* Explanation of symbols for main parts of the drawings

2: central control processing unit 6: hardware control processing unit

8: switch control panel

The present invention relates to a method for returning the maximum demand power meter of a power supply complex meter, and more particularly, to a method for returning the maximum demand power meter of a power supply complex meter that resets the measured value of the maximum demand power meter measured in units of 15 minutes. It is about.

Combined power supply meter is used for business or industrial consumer in combination with transformer and transformer for electricity, and it has the functions of all-day power meter, precision power meter for power factor measurement, reactive power meter for power factor measurement, maximum demand power meter and time switch. .

Therefore, it is not necessary to change the display value of the maximum demand power meter indicating the maximum demand power which is the maximum value after the meter reading among the demand power in the demand time period while measuring the demand power for 15 minutes which is the rated demand time.

However, a conventional method for resetting the present demand power and the maximum demand power to zero in a conventional maximum demand power meter or a power supply and demand multi-function multimeter including the same has not been efficiently utilized.

Accordingly, the present invention relates to a method of returning the maximum demand power meter of the power supply-demand composite meter to reset the display of the demand time, current demand power and maximum power manually or automatically.

In order to achieve the above object, the present invention provides a precision power meter for measuring the cumulative power factor of the precision power meter when the user turns on the maximum demand power return switch of the control panel or when it is 00: 00 of the scheduled measurement date or 00: 00 of the measurement confirmation date. The cumulative power, cumulative reactive power, and maximum demand power of the power factor measurement time period are reset to zero.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Effective pulses (WP) due to voltage values proportional to instantaneous power and short circuits by using current and voltage values detected through current transformers (CT) and instrument transformers (PT) not shown in the figure. The effective pulse (WP) and the phase value (PE) are obtained from a power measuring unit (not shown) that calculates an invalid pulse (QP) based on a phase value PE according to a ground fault or a voltage value proportional to the reactive instantaneous power. And an input compensator 11 for receiving an invalid pulse (QP) and compensating for a reduced value and a change caused by noise during signal transmission;

The time setting clock is input from the clock generator 3 while receiving the normal effective pulse WP, the phase value PE, and the invalid pulse QP via the input compensator 1, and thus the amount of active power and invalidity. A central control processor 2 which calculates values for power amount and power factor and outputs a power amount pulse signal, an effective pulse compensation signal and an invalid pulse compensation signal;

Receives an invalid pulse compensation value from the central control processor 2 and outputs an invalid pulse compensation signal to the power measuring unit 4, and a valid pulse compensation value is input from the central control processor 16. A time-effective pulse compensation unit 5 for outputting an effective pulse compensation signal to the measurement unit;

Receiving the time setting clock from the clock generator 7 while receiving the power amount pulse signal from the central control processing unit 2, the clock of the current time and time is performed and the setting / memory switch of the switch operation unit 8 ( A hardware control processor 6 which receives a control signal according to a user's processing operation through SW1), a number conversion switch SW2, a maximum demand power return switch SW3, and outputs various display signals;

Operation of the electricity meter by selectively blinking the corresponding LED of the first display unit 10 while receiving the operation display signal, the reactive power meter operation display signal, the no-measurement display signal, and the power failure display signal of the electricity meter from the hardware control processor 6, respectively. A first display driver 9 for indicating whether a state kwh, an operating state kvarh of a reactive power meter, a non-measured (or reverse flow) state (no-measured), or a power failure state (interruption),

Accumulated power amount of the late night time zone to the present through the second display unit 12 by receiving a display signal for the cumulative power meter up to the present (measurement day) of the late night time zone from 22:00 to 08:00 from the hardware control processing unit 6 A second display driver 11 for notifying 6 digits (for example, 6 digits including 2 decimal places, such as 1027.32kwh),

Accumulated power amount from the hardware control processing unit 6 to the present (measurement day) accumulated power amount from the daytime time zone of 08:00 to 18:00 through the third display unit 14 A third display driver 13 for notifying 6 digits (for example, 3028.84 kwh),

Accumulated power amount from the hardware control processing unit 6 to the present (measurement day) accumulated power amount from the evening time of 18:00 to 22:00 through the fourth display unit 16 to the present time of the evening time accumulated power amount A fourth display driver 15 for notifying 6 digits (for example, 3134.26 kwh),

A fifth display that receives the power factor display signal for power factor measurement from the hardware control processor 6 and informs the cumulative amount of power in a specific power factor specific time period by a number of six digits (for example, 0255.81 kwh) through the fifth display unit 18. The driving unit 17,

The power factor measuring reactive power display signal is inputted from the hardware control processor 6, and the sixth display unit 20 informs the cumulative reactive power amount of the countercurrent measurement time period by a six-digit number (for example, 0028.14 kvarh). 6 drive unit 19,

A seventh display driver 21 for receiving a screen display signal from the hardware control processor 6 and indicating whether or not to read the meter while expressing no display or meter reading through the seventh display unit 22;

The hardware control processing unit 6 receives the demand power indication signal for the current demand time in the daytime time range of 08:00 to 18:00, and then, through the eighth display driver 24, reads the daytime An eighth display driver 23 for notifying the demand power for the current demand time period or the cumulative maximum demand power of the meter reading day with four digits;

The maximum demand power of the daytime period from the hardware control processing unit 6 to the present day time period from 08:00 to 18:00 is input through the ninth display unit 26 and the maximum demand power of the daytime period until now is 4 A ninth display driver 25 informed by digits,

The maximum demand power of the evening time after the last meter reading through the 10th display unit 28 by receiving the maximum demand power display signal of the evening time from 18:00 to 22:00 from the hardware control processing unit 6 A tenth display driver 27 notified by a digit;

Receives the demand power display signal for the current demand time of the evening time of 18:00 ~ 22:00 from the hardware control processing unit 6 through the eleventh display unit 30 to the present time of the evening time until the present An eleventh display driver 29 informing a 4-digit number of cumulative maximum demand power of demand power or meter reading date for a demand time period;

A twelfth display for receiving a time display signal or a power factor display signal from the hardware control processor 6 and informing a power factor of 100 minutes or an elapsed time of the current demand time in 15-digit units in two digits through the twelfth display unit 32; The driving unit 31,

The thirteenth signal which receives the time display signal from the hardware control processor 6 and informs the thirteenth display unit 34 of the current hour / minute (12:29) or month / day (10.24) to be read. It is comprised with the display drive parts 33.

The method of returning the maximum demand power meter of the power supply / demand composite meter of the present invention configured as described above uses the current value and the voltage value detected by the current transformer and the instrument transformer, and the effective pulse (WP), the phase value (PE), and the invalid pulse in the power measurement unit. A QP is calculated and the central control processor 2 receiving the input outputs a power amount pulse signal including values for the effective power amount, the reactive power amount and the power factor.

Then, in the hardware control processor 6 receiving the power pulse signal from the central control processor 2, the current demand power, its cumulative value and maximum value for each time zone, as well as the amount of power and reactive power for a specific power factor time period, and the like. First to thirteenth display drivers 9, 11, 13, 15, 17, 19, 21, 23, 25, 27, and 29 Through (31), (33) through the first to third display units (10), (12), (14), (16), (18), (20), (22), (24), (26) ), (28), (30), (32),

The data is stored in the internal memory or an external memory (not shown), indicated by (34).

If you want to know the new power usage or the power usage status while using it, you need to initialize all display values to 0.

In addition, after the meter reading, the display values up to this point should be stored and some of the values used as cancer should be displayed.

Therefore, when the user turns on the maximum demand power return switch SW3 of the switch operating section 8 (step 40), the hardware control processing section 6 that recognizes the second display returns the current display screen as shown in FIG. While changing to the display screen of the meter reading as shown in (b) (step 41), the cumulative power amount of the day time zone to the present of the second display unit 12 indicating the precision power amount, and the cumulative power amount of the day time zone to the present day of the third display unit 14 , Cumulative power amount of the evening time zone to the present time of the fourth display unit 16, cumulative power amount of the power factor measurement time zone to the present time of the fifth display unit 18, cumulative power amount of the power factor measurement time zone to the present time of the sixth display unit 20, The cumulative reactive power amount of the power factor measurement time to the present time of the 6th display part 20, the maximum demand electric power amount in the daytime period to the present after the last meter reading of the 9th display part 26, and the present time after the last meter reading of the 10th display part 28 Maximum demand in the evening Is stored in the memory (step 42), the weekly time zone demand power amount for the current demand time of the eighth display unit 24, the maximum demand power amount in the day time zone to the present after the last reading of the ninth display unit 26, and the tenth display unit ( 28 the maximum power demand in the evening time after the last meter reading and the demand power in the evening time with respect to the hanging time of the eleventh display unit 30 are the eighth display driver 23, the ninth display driver 25, and the tenth power. The display driver 27 is reset to zero through the display driver 27 and the eleventh display driver 29 (step 43).

The thirteenth display section 34 stores the month and day of the manual return execution day as shown in (b) of FIG. 2 (step 44) and stores it in the memory (step 45).

On the other hand, it is checked whether or not it is the moment when it becomes 00:00 of the predetermined scheduled meter reading date (the egg determination date) (step 46), and if it is corrected, the display screen of the meter reading is changed as in the case of the manual return (step 47), and the second to the second 6 Accumulated power amount of the late night time zone, day time and evening time, the accumulated power amount and the cumulative reactive power amount of the power factor measurement time period up to the present of the display unit 12, 14, 16, 18, and 20 After the last reading of the ninth and tenth display sections 26 and 28, the maximum demand power of the daytime and evening time zones up to the present time is stored in the memory (step 48), and the eighth to eleventh display sections 24, ( The display values 26, 28 and 30 are reset to 0 (step 49), and the thirteenth display section 34 stores the month and day of the meter reading date (step 50) and stores it in the memory ( Step 51).

Therefore, according to the method of returning the maximum demand power meter of the power supply and demand multi-function meter of the present invention, when the meter reading date or the measurement confirmation date is 00:00 or when the user turns on the maximum demand power return switch SW3 of the switch control unit 8, Accumulated power amount and maximum power amount up to are stored in memory, and the accumulated maximum demand power and maximum demand power corresponding to the current demand power are reset to 0 so that the new values can be known again and the date of the reading is memorized. However, the contents of the power usage can be easily known.

Claims (1)

In the method of returning the maximum demand power meter of the power supply / demand system, the central processing unit 2 recognizes a state in which the user turns on the maximum demand power return switch SW3 or checks whether the current time is 00:00 of the meter reading date. Changing the display of the screen to meter reading on the seventh display unit 22 while receiving the display signal of the screen from the hardware control processing unit 6 in the central processing unit 2, and the hardware control processing unit in the central processing unit 2 (6) from the second to the sixth display unit (12) (14) (16) (18) (20) to the present time of the late night time cumulative power, day time time cumulative power, evening time cumulative power, power factor measurement time cumulative power And storing the power consumption of the power factor measurement time zone as well as the cumulative reactive power of the ninth and tenth display units 26 and 28, and storing the maximum demand power in the daytime and evening time in the memory. Resetting the weekly demand power, the maximum demand power of the day time zone, the maximum demand power of the evening time band and the evening demand power of the eighth to eleventh display units 26 and 28 through the hardware control processor 6 to zero. And, by the central processing unit 2, storing the month, day of manual recovery or the month and day of the meter reading date in which the user has turned on the maximum demand power return switch SW3. The method of returning the maximum demand power meter of a complex instrument.