KR19980076985A - Digital integrated power meter and its control method - Google Patents

Abstract

The present invention relates to a digital integrated power meter and a control method thereof.

The present invention enables the cumulative calculation of the current power consumption of the power consumer, and at the same time can display the total calculated power consumption and the current power consumption, and perform the automatic meter reading function and discount and premium rate setting function at the power supply source. In order to be able to be, the voltage and current detection unit for detecting the voltage and the current applied to the power line connecting the power supply terminal and the load side terminal and converting into digital data; A timer for outputting time information; A display unit which displays the current amount of power used and the total amount of power used; A memory configured to store the current amount of power used and the total amount of used power by data; A condition setting unit for setting the current amount of power and the total amount of used power to be discounted and surcharged for any condition to which discount and premium efficiency are applied; And calculating a current power consumption using the voltage and current values detected by the voltage and current detection unit and time information from the timer, and accumulating the total power usage and the current power usage stored in the memory. A digital integrated power meter including an arithmetic and control unit for storing a total power consumption and a current power usage in the memory and controlling the current power usage and the accumulated total power usage to be displayed on the display unit.

Description

Digital integrated power meter and its control method

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital integrated power meter and a control method thereof. More specifically, the integrated power meter can be integrated in different calculation methods in accordance with arbitrary setting conditions such as time zones and seasons. The present invention relates to a digital integrated power meter and a control method thereof.

In general, a power supply system must secure a large amount of reserve power in order to be able to supply the enormous amount of power used during the day during the day (human activity time). In addition, the amount of reserve power to be secured is increasing due to the increase in power consumption due to the recent increase in population and the trend of large-sized industry. This results in the need for additional power plants, which adds enormous construction costs. In order to solve the above problems, it is recommended to use the off-season power of the late night, and correspondingly, it provides a benefit such as discounting the power bill.

However, in order to use the midnight electric power with discount benefits, the electric power customer must install a separate midnight electric power meter and perform extra internal and external work so that the midnight electric power can be supplied. It adds to the economic burden nationally and personally. Thus, it is almost practically impossible for a power consumer to have a separate midnight power meter.

Meanwhile, as shown in FIG. 1, the analog-type integrated power meter includes a voltage coil 1, a current coil 2, a rotating plate 3 made of aluminum, a braking magnet 4, and a metering device. And the display unit 5).

Here, the rotating plate (3) is installed between the magnetic pole (w) wound around the voltage coil (1) and the current coil (2), the upper magnetic pole and the load (for example, electric light, electric heater or motor, etc.) The magnets are magnetized by the voltage coils 1 connected in parallel, and the lower electrode is configured to be magnetized by the current coils 2 connected in series with the load.

As described above, since the current coil 2 is connected in series with the load side, its phase is the same as the phase of the voltage V applied to the load side, but the voltage coil 1 has a large impedance because of the large number of wound turns, and thus the voltage ( When V) is supplied, the voltage flux ψ _P has a phase delayed approximately 90 ° from the voltage. In addition, the load current I flows through the voltage coil 1 so that the current magnetic flux ψ _C has the same phase as the load current I. Therefore, a moving magnetic field corresponding to the phase difference β is generated between the voltage magnetic flux ψ _P and the current magnetic flux ψ _C , and correspondingly to the rotating plate 3 penetrating with ψ _C , ψ _P , -ψ _C. A driving torque Td proportional to ψ _P ψ _C Sinβ is generated and the rotating plate is rotated in the direction of the arrow.

This relationship is expressed by Equation 1 as follows.

[Equation 1]

ψ _P ∝ V, ψ _C ∝ I

β = 90 °-φ (where φ is the power factor angle of the load)

Therefore, the drive torque Td is proportional to the load power VIcosφ. That is, the rotational force of the rotating plate 3 is proportional to the product of the current I and the voltage V.

On the other hand, the control plate To is generated in the rotating plate 3 in proportion to the rotational speed by the braking magnet 4. Therefore, the rotating plate 3 rotates in a state where the drive torque Td and the control torque To are in equilibrium. Therefore, the rotation speed n per unit time of the rotating plate 3 is proportional to the load power p (p = kn; where 'k' is a proportional coefficient). Since the metering device measures the number N of rotation of the rotating plate 3 within a predetermined period, the amount of power W during the period can be expressed by the following equation (2).

[Equation 2]

W = KN

Here, K is the amount of power (KWh / Rev) when the rotating plate 3 rotates once. Therefore, by installing a gear device between the rotating plate 3 and the metering device and the display unit 5, the dial of the display unit 5 is rotated at a rotation speed shifted from the rotation speed of the rotating plate 3 to display the amount of power used by the user. It was made.

By the way, according to the conventional analog integrated power meter as described above, the following problems occur.

(1) Since the rotating plate 3 is rotated by the phase difference between the voltage coil 1 and the current coil 2, it is mechanically configured to display the amount of integrated power, and thus its volume is large. Therefore, the installation space is limited.

(2) Electric power consumers who want to receive discounts using midnight electric power should carry out indoor entrance work and extension work of outdoor ships, and separate electric power meter for midnight electric power should be installed. In other cases, the country is burdened with additional expenses.

Therefore, the present invention is to solve the above problems, the first object of the present invention is to calculate the power consumption digitally by the program, there is no need for a separate installation work and the installation space of small size To provide a digital integrated power meter.

In addition, a second object of the present invention is to provide a digital integrated power meter that accommodates daytime power and midnight power at the same time as a single power supply line, and can integrate different power consumption for each power.

In addition, a third object of the present invention is to provide a digital integrated power meter having a separate display unit to display the daytime power consumption and the midnight power consumption by using one integrated power meter.

In addition, a fourth object of the present invention is to provide a digital integrated power meter capable of simultaneously displaying the daytime power consumption and the midnight power consumption on one display unit.

In addition, a fifth object of the present invention is to provide a digital integrated power meter that enables to perform a remote meter reading function at the power supply, and at the same time to remotely set a separate usage fee for each power use time and season.

In addition, a sixth object of the present invention is to provide a control method of a digital integrated power meter for achieving the first to fifth objects described above.

1 is a front view illustrating a general analog integrated power meter;

2 is a schematic internal block diagram of a digital integrated power meter according to the present invention;

3 and 4 are flowcharts illustrating operations of the operation control unit illustrated in FIG. 2.

<Description of the symbols used in the main parts of the drawing>

6: transformer 7: first analog / digital (A / D) converter

8: Current transformer 9: Second analog / digital (A / D) converter

10: operation control unit 11: power amount display unit

12: integrated power display unit 13: power drive unit

14: memory 15: timer

16: midnight power setting unit 17: communication processing unit

A feature of the present invention for achieving the above object is a voltage and current detection unit for detecting the voltage and current applied to the power line connecting the power supply terminal and the load side terminal and converting into digital data; A timer for outputting time information; A display unit which displays the current amount of power used and the total amount of power used; A memory configured to store the current amount of power used and the total amount of used power by data; A condition setting unit for setting the current amount of power and the total amount of used power to be discounted and surcharged for any condition to which discount and premium efficiency are applied; And calculating a current power consumption using the voltage and current values detected by the voltage and current detection unit and time information from the timer, and accumulating the total power usage and the current power usage stored in the memory. And a computing control unit for storing a total power consumption and a current power usage in the memory, and controlling the display to display the current power usage and the accumulated total power usage on the display unit.

In the above aspect of the present invention, the voltage and current detection unit, the transformer for electrically insulating between the power supply line and the operation control unit, and converts and detects the voltage level applied to the power supply line to a predetermined ratio; A first analog / digital converter for digitizing the voltage value converted by the transformer and outputting the digital value to the operation control unit; A current transformer which electrically insulates the power supply line from the operation control unit and converts and detects a current level flowing through the power supply line to a predetermined ratio; And a second analog / digital converter for digitizing the current value converted by the current transformer and outputting the digitized current to the operation control unit.

The display unit may include a power amount display unit that displays the current amount of power used by the operation control unit; And an integrated power amount display unit for displaying a new total power amount by accumulating the current power amount and the total power amount stored in the memory.

The power amount display unit may include a first power consumption to which a discount and a premium rate are applied according to a condition set by the condition setting unit, and a second power consumption to which a discount and premium rate according to a condition set by the condition setting unit is not applied. A separate display element may be included to display each separately.

The power amount display unit may include the first power consumption to which the discount and premium rate is applied according to the condition set by the condition setting unit, and the second power to which the discount and premium rate according to the condition set by the condition setting unit is not applied. It is also possible to collectively add up the usage amounts so that they can be simultaneously displayed on one display element.

The memory is preferably a nonvolatile memory in which data stored at the time of power failure is not lost.

The condition setting unit may be configured to control the operation control unit by dividing the day time zone and the late night time zone.

In addition, mutual communication between a power supply destination and the operation control unit may be performed, and the discount rate received from the power supply destination by transmitting the current power consumption amount and the total power consumption data stored in the memory to the power supply destination. And a communication processing unit receiving control data corresponding to an arbitrary condition to be set in the condition setting unit and providing the control data to the operation control unit.

The display unit may separately display the daytime meter reading state and the nighttime meter reading state according to a control signal received from the power supply source through the communication processor.

On the other hand, another feature of the present invention is a control method of a digital integrated power meter, in which power consumption is integrated by applying different discounts and premium rates according to arbitrary conditions: a voltage value from a power line between a power supply terminal and a load side terminal. Detecting an overcurrent value and detecting a use time from a timer; If the current power usage condition meets any of the above conditions, the current power usage condition is calculated by applying the discount and the premium rate to the detected voltage value, current value, and usage time. A second step of calculating a current amount of power using the detected voltage value, current value, and usage time if the condition is not met; A third step of storing the calculated current power amount in a memory and updating and storing the total power amount by accumulating the total power amount stored in the memory and the current power amount; And a fourth step of displaying the renewed and stored total used power amount and the current used power amount on a display device.

In another aspect of the present invention, the arbitrary conditions may be set for each time zone that can distinguish the day time zone and the late night time zone.

In the fourth step, the current power consumption and the updated total power usage may be displayed separately on separate display devices.

Further, in the fourth step, in displaying the current amount of power used, the current amount of power applied with the discount and the premium rate and the current amount of power not applied with the discount and the premium rate are separately displayed on a separate display device. You can also display them individually.

In addition, a fifth step of arbitrarily changing the discount and premium rate and the arbitrary conditions by using a communication line at the power supply, and storing the changed discount and premium rate and the arbitrary conditions; And a sixth step of transmitting the stored current used power amount and the updated total used power amount data to the power supply to perform an automatic meter reading function.

Hereinafter, preferred embodiments of a digital integrated power meter and a control method thereof according to the present invention will be described in detail with reference to the accompanying drawings.

2 shows a schematic internal structure diagram of a digital integrated power meter according to the present invention.

2, a transformer 6 for detecting a drive voltage in an integrated power meter from a power supply line connecting the power supply terminals L1 and L2 to the load side terminals L3 and L4, and the transformer 6 A first analog / digital converting unit (first A / D converting unit) 7 for converting an analog driving voltage into a digital driving voltage, and a current transformer for converting current levels supplied to the load sides L3 and L4. (8), a second analog / digital converter (second A / D converter) 9 for converting the analog current detected by the current transformer 8 into a digital form, and a first analog / digital converter. It is operated by the driving voltage applied from the converter 7 and calculates the daytime and midnight power using the detected current applied from the second analog / digital converter 9, processes the communication signal, and performs automatic meter reading. The operation control unit 10 performing the processing function and the current amount of power used are listed. In order to display the total amount of power in which the current amount of power used and the conventional amount of power used are accumulated on the integrated amount display 12, the amount of power driver 13 for controlling the driving state of the integrated amount of power display 12. ), A memory 14 having stored therein a power amount calculation program and storing data representing a conventional amount of power used and a current amount of used power, a timer 15 for outputting time information, and time information applied from the timer 15. And a late night power setting unit 16 for controlling the amount of power calculation in the daytime and late night hours, and a communication processing unit 17 for performing various types of communication with the power supply destination.

The operation of the present invention having the configuration as described above will be described with reference to FIGS. 3 and 4 as follows.

The transformer 6 transforms the voltage to a predetermined level in order to detect a voltage applied on the line between the power supply side terminals L1 and L2 and the load side terminals L3 and L4. At this time, the transformer 6 serves to electrically insulate between the line and the digital integrated power meter. The transformed voltage is used as a data for calculating the amount of power and used as driving power for driving the internal components of the digital integrated power meter. The voltage value transformed by the transformer 6 is converted into digital data through the first analog-to-digital converter 7 and supplied to the operation control unit 10 (S1).

In addition, the current transformer 8 converts the current to a predetermined level in order to detect a current flowing on the line between the power supply side terminals L1 and L2 and the load side terminals L3 and L4. At this time, the current transformer 8 serves to electrically insulate between the line and the digital integrated power meter. This current flow is used as a data for calculating the amount of power. The current value flown by the current transformer 8 is converted into digital data through the second analog-to-digital converter 9 and supplied to the operation control unit 10 (S2).

The operation control unit 10 performs power value calculation, power amount calculation, midnight power calculation, communication signal processing, and automatic meter reading processing. In addition, the digital voltage and current data are received from the first and second analog-to-digital converters 7 and 9 to calculate the current power consumption and the integrated total power consumption according to the power calculation program stored in the memory 14. (S3, S4). The current power consumption and the total power consumption calculated in this way are displayed on the power display 11 and the integrated power display 12, respectively (S5).

In addition, the arithmetic and control unit 10 converts the result calculated on the basis of the electric power calculation formula based on the current use power and the use time into a digital pulse signal, and then outputs it to the electric power drive unit 13. The electric power driving unit 13 operates the integrated power display unit 12 according to the digital pulse signal applied from the operation control unit 10 to display the total electric power used.

On the other hand, in the above-described power amount calculation process, the power amount accumulation calculation method is adopted by the memory 14. That is, the current power consumption is output as a digital pulse signal by the power calculation program based on the calculated power and the usage time, and this output pulse is summed up with the conventional power usage data stored in the memory 14 and the total power consumption. The data is calculated. The total power consumption data thus calculated is stored in the memory 14 again. Here, the memory 14 preferably employs a nonvolatile memory so that the corresponding data is not lost even during a power failure. However, in addition to the method using the memory 14 shown in FIG. 2, the mechanical cumulative calculation method currently employed in the analog integrated power meter may be applied.

On the other hand, the midnight power setting unit 16 controls the operation control unit 10 to distinguish between the daytime and the late night time zone according to the time information applied from the timer 15, and to perform a power calculation program suitable for the divided time zones. .

That is, referring to FIG. 4, the power calculation formula is described in more detail. When the power calculation program is executed (S6), the operation controller 10 detects the current time using the time information output from the timer 15. (S7). In addition, the operation controller 10 compares the late night time information set in the late night power setting unit 16 with the current time information from the timer 15 to determine whether the current time is a late night time zone or a day time zone (S8). . If it is determined in step 8 (S8) that the current time is not the late-night time zone, the operation control unit 10 calculates the current amount of power used according to the power calculation program of 'power x use time' (S9).

If it is determined in step 8 (S8) that the current time is a midnight time zone, the operation control unit 10 calculates the current power consumption according to the power calculation program of 'power x use time x (1-discount)' ( S10).

The power consumption data calculated differently according to the current time is output as pulse signals having different frequencies from each other by the operation controller 10, and the electric power driver 13 receives pulse signals of different frequencies applied from the operation controller 10. It is also possible to control the display value of the integrated power amount display section 12 by controlling the current value calculation formula output from the current transformer 8. In this case, the power amount driver 13 may be designed to operate in proportion to each frequency of the pulse signal output from the operation controller 10.

That is, the amount of power used in the daytime and the amount of power used in the late night are collectively displayed on the power amount display unit 11, and a built-in timer 15 with high precision, such as a crystal oscillator, is used to distinguish between day and night time. The amount of power to be used was calculated by substituting a discount rate (for example, 30%, 50%, etc.) using the late night power setting unit 16, which is a discount rate setting device for a late night, to integrate the power amount. Here, the amount of power used in the daytime and the amount of power used in the middle of the night may be displayed on a separate power amount display unit 11, in which case the built-in timer to count the time even if the power supply is cut off from the outside to prepare for power failure desirable.

Therefore, when there are no loads in the load side terminals L3 and L4 (when no electricity is used), current is not induced in the current transformer 8, so that only the timer 15 for day and night is driven. Subsequently, when the power receiver puts a load such as an electric light, a heater, a motor, or the like on the load terminals L3 and L4, a current corresponding to the corresponding load value is induced in the current transformer 8, and the second analog-to-digital converter 9 is turned off. By converting the digital current data through the applied to the operation control unit 10, the amount of power used is counted, the total amount of power used is integrated. At this time, the driving power of the integrated power meter is minimal.

Next, the automatic meter reading method according to the present invention will be described. In accordance with the power calculation program within the operation control unit 10, the year is set by seasons, time zones, periods, and the like so as to automatically read by the set contents. At this time, the communication processing unit 17 is connected to the power supply destination through the communication line to detect the total power consumption and the current power consumption data stored in the memory 14 in accordance with a unique command from the power supply source to output to the power supply destination. In addition, the power amount calculation program and the late night increase rate programmed in the operation control unit 10 may be arbitrarily controlled by the power supply. In this case, the day and night metering status may be separately displayed on the integrated power meter installed in the customer from the power supply source. Therefore, the power supplier can automatically read the current power consumption and the total power consumption from the digital integrated power meter installed in the power consumer, and the discount rate can be arbitrarily changed and set.

As a result, according to the present invention as described above, the following effects occur.

(1) Miniaturization is possible by employing an integrated circuit that processes signals digitally, thereby not being constrained by the installation space.

(2) Since one day integrated electricity meter can check different daytime power consumption and midnight power consumption at the same time, it is not necessary to separate the work to supply the midnight power, thereby eliminating the burden of expenses.

(3) By displaying the daytime power consumption and the midnight power consumption separately on the power display of the digital integrated power meter, each power consumption can be easily identified.

(4) As the unique command is input through the communication line at the power supply source, the digital integrated power meter outputs information on the current power consumption and total power consumption to the power supply, so that the remote meter reading can be easily performed.

(5) Since the communication processing unit of the power supply destination and the digital integrated power meter is configured to communicate via mutual communication lines, the discount rate can be easily changed and set according to an arbitrary condition such as time period, period, etc. at the power supply destination. It is convenient.

(6) Since electric power consumers can effectively use the late-night power provided with discount benefits, they can stimulate the psychology of the electric power consumers who want to obtain the discount benefits of the late-night electric power, and voluntarily inspire energy conservation.

Claims (14)

A voltage and current detection unit for detecting and converting a voltage and a current applied to a power line connecting the power supply terminal and the load terminal to digital data; A timer for outputting time information; A display unit which displays the current amount of power used and the total amount of power used; A memory configured to store the current amount of power used and the total amount of used power by data; A condition setting unit for setting the current amount of power and the total amount of used power to be discounted and surcharged for any condition to which discount and premium efficiency are applied; And The current amount of power used is calculated using the voltage and current values detected by the voltage and current detector and the time information from the timer, and the total amount of power used and the current amount of power stored in the memory are accumulated to calculate a new total amount. And an operation controller configured to store the amount of used power and the current amount of used power in the memory, and to control the display to display the current amount of used power and the accumulated total power used on the display. The method according to claim 1, wherein the voltage and current detection unit, A transformer that electrically insulates the power supply line from the operation control unit and converts and detects a voltage level applied to the power supply line by a predetermined ratio; A first analog / digital converter for digitizing the voltage value converted by the transformer and outputting the digital value to the operation control unit; A current transformer which electrically insulates the power supply line from the operation control unit and converts and detects a current level flowing through the power supply line to a predetermined ratio; And And a second analog / digital converter for digitizing the current value converted by the current transformer and outputting the digitized current. The method of claim 1, wherein the display unit, A power amount display unit displaying the current amount of power used by the calculation control unit; And And a total power amount display unit for displaying a new total power amount accumulated by calculating the current power amount and the total power amount stored in the memory. The method according to claim 3, wherein the power amount display unit, The first power consumption to which the discount and the premium rate are applied according to the condition set by the condition setting unit and the second power consumption to which the discount and the premium rate according to the condition set by the condition setting unit are not displayed can be displayed separately. Digital integrated power meter including a separate display element. The method according to claim 3, wherein the power amount display unit, The first power consumption to which the discount and the premium rate are applied according to the condition set by the condition setting unit and the second power consumption to which the discount and the premium rate according to the condition set by the condition setting unit are not collectively added together. Digital integrated power meter, characterized in that to display on one display element at the same time. The method of claim 1, wherein the memory, Digital integrated power meter, characterized in that the stored data is not lost even in the event of power failure. The method according to claim 1, wherein the condition setting unit, Digital integrated power meter, characterized in that to control the operation controller by dividing the day time zone and the night time zone. The method according to claim 1, The communication between the power supply source and the operation control unit may be performed, and the data of the current power consumption and the total power consumption stored in the memory are transmitted to the power supply, and the discount rate received from the power supply and the And a communication processing unit receiving control data corresponding to an arbitrary condition to be set in the condition setting unit and providing the operation data to the operation control unit. The method of claim 8, wherein the display unit, And a day meter reading state and a midnight meter reading state according to a control signal received from the power supply unit through the communication processor. In a control method of a digital integrated power meter, in which power consumption is integrated by applying different discounts and premium rates according to arbitrary conditions: A first step of detecting a voltage value and a current value from a power supply line between the power supply side terminal and the load side terminal, and detecting a use time from a timer; If the current power usage condition meets any of the above conditions, the current power usage condition is calculated by applying the discount and the premium rate to the detected voltage value, current value, and usage time. A second step of calculating a current amount of power using the detected voltage value, current value, and usage time if the condition is not met; A third step of storing the calculated current power amount in a memory and updating and storing the total power amount by accumulating the total power amount stored in the memory and the current power amount; And And a fourth step of displaying the renewed and stored total used power amount and the current used power amount on a display device. The method according to claim 10, wherein the arbitrary conditions, The control method of the digital integrated power meter, characterized in that it is set for each time zone to distinguish the day time zone and the night time zone. The method of claim 10, wherein the fourth step, And controlling the current power consumption and the updated total power consumption to be displayed separately on separate display devices. The method of claim 10, wherein the fourth step, In displaying the current power consumption, the current power consumption to which the discount and premium rate is applied, and the current power consumption to which the discount and premium rate is not applied are individually displayed on separate display devices. Digital integrated power meter control method. The method according to claim 10, A fifth step of arbitrarily changing a discount and a premium rate and the arbitrary condition using a communication line at a power supply, and storing the changed discount and premium rate and the arbitrary condition; And And a sixth step of transmitting the stored current power consumption and the updated total power consumption data to the power supply to perform an automatic meter reading function.