JP3133118B2 - Power meter control method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates] The current measured object, electrostatic
Relates to a power meter for measuring a power parameter based on pressure ,
Speaking in detail further, A to obtain an average value within a predetermined time period
The present invention relates to a method for controlling a wattmeter having a verge function .

[0002]

BACKGROUND OF THE INVENTION power meter, detects <br/> the current and voltage of the object to be measured, these detection signals digitally converted sampled power parameter based on the data (voltage effective
With values, current effective value, active power, reactive power, not only measures and calculates the power factor), the measured current for each predetermined period, voltage, an averaging function of calculating an average value of such power
There are things that are .

The averaging function is, as shown in FIG.
The average is set from the average start time set by the operator.
Multiple within the average time range until the storage stop
Divided into average intervals, and each average
Simple data values sampled at intervals
, And divide the sum by the number of samples to
This function calculates the average value.

This average function is used to measure the average daily power consumption as shown in the graph of FIG.
You. That is, set the average time to 24 hours,
If you set the average interval to 1 hour, 1 hour
When the power value by the sampling data is added to each
Both calculation dividing the number of sampling is performed, 1:00
The average value of the power consumption for each interval is obtained.

[0005] The average value is graphed and displayed.
The details of the hourly power consumption of the day
It is possible to know the average value of the power consumption of the day.

[0006]

By the way, the conventional electric power
In total, as indicated by the shaded portion in FIG. 8, for example during the averaging operation, the sampled data is set Les
The next average interface
Error display during data display
LED is turned on, for example.
Light indication is limited to the average interval time
Is often overlooked.

At the end of each average interval,
Or at the end of the average time, as shown in FIG.
The average value is printed, but there is no input as described above.
If the average is incorrect and inaccurate,
For Warazu not specifically been like is attached mark, Ri divided whether the input over any average interval occurs
Hateful. To check this, set each printed data
Must match the upper limit of the range.

As another method, sampling data is set.
When exceeding the fixed range, an input over error
There is a method to terminate the measurement by
And the data collected so far will be wasted
Is not preferred.

[0009] The present invention has been made in order to solve the above-mentioned problems.
The goal was to make the average interval
During the middle and after the average time,
You can easily find out if there was an input over
Also, measure even if there is an input over
And the average value to be displayed should be a guide
To ensure that data is used without wasting
To provide a control method for a power meter.

[0010]

In order to achieve the above object, the present invention takes an input from an input section as an analog signal.
The A / D converter converts the current and voltage of the measured
Converted into digital data by sampling intervals, the CPU
Based on the above data, the active power and
Calculate power parameters including active power, and
Put within the predetermined time period by averaging function of the CPU
Calculate the average value of the above power parameters and calculate them.
Results In the control method of the power meter to be displayed on the display unit, and on
Note that the CPU has an
The level value is set, and the CPU
If the over level value is exceeded,
Change the data value to the above over-level value and the above average value
Continuing the calculation and exceeding the above data
After the specified period elapses, the
The above flag is set when displaying the result.
When the display is a display,
If the display blinks, the display is a printer
It is characterized in that in such a case, an overmark is attached and printing is performed.

As an example, the upper limit value of the set range of the input section
Is 150V, the CPU gives 15% of 102%
3.0 V is set as the over-level value. Input data
Data is, for example, 156.5V and the resolution of A / D conversion
When accurate digital conversion is not possible
However, according to the present invention, the input data is 153.0.
The average value calculation is continued as V. This average is
Although it is a guideline that includes a degree error,
It's much better than being cut off. Ma
In addition, the blinking display and overmark
Easily check if input has been exceeded at intervals
You can know.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A power meter to which the control method of the present invention is applied has, for example, as shown in FIG. 3, a three-channel input unit 1 for inputting current and voltage signals of a device under test as analog signals . A / D for sampling and digitally converting currents and voltages from the input units 1, 2, and 3 and the input units 1, 2, and 3
Conversion units 4, 5, 6, a memory unit 7 for storing these digitally converted data, and one of power parameters based on the data fetched into the memory unit 7, for example,
Thereby calculating the active power, CP for calculating the average value for each A <br/> Beret di interval Ri by the averaging function
U8, and a display unit 9 and a printer unit 10 for displaying and printing the calculated average value. What
In addition to the active power, the power parameters
Value, effective current, reactive power, and power factor.

[0013] A / D converter 4, 5, 6, the memory unit 7, the display unit 9 and the printer unit 1 0 is connected to the bus 11 of the CPU 8, are controlled by the CPU 8. Therefore <br/>, etc. CPU8 control program is stored in the memory unit 7.

Next, a method of controlling a wattmeter according to the present invention will be described with reference to the flowcharts of FIGS. 1 and 2, a time chart of FIG. 4, and a printing state diagram of FIG.

[0015] The operation panel (not shown) of the power meter
In measuring the daily power consumption on the surface, for example, as shown in FIG. 7, the average time becomes 24 hours,
Average interval set to 1 hour
And Also, the setting range of each of the input units 1 to 3 is 150 V
The CPU 8 has 102% of 153.0 V
It has been set as the bar level value.

First, in order to calculate the power of the measured object,
The current and voltage signals taken from the input units 1, 2, 3 are A
/ D conversion unit 4,5,6
The digitally converted data is
(Step ST1).

Next, data is over-leveled by the CPU 8.
It is determined whether or not the threshold value (153.0 V) is exceeded.
(Step ST2). Data exceeds the over-level value
If not, see step ST3 binary, this sampled data to the data obtained by adding to the addition process namely previous data is added.

[0018] Subsequently, in the case where it is determined whether one hour of A beret di interval has elapsed is determined (step ST4), not the average interval has elapsed, stearyl
The data addition process of steps ST1 to ST3 is repeated, and the added data is stored in the memory unit 7.

[0019] However, as shown in FIG. 4, during a predetermined averaging interval, when the sampled data exceeds the over-level value (when a words input over), the determination of the data-over performed in step ST2 is the program proceeds to step ST5, the over level value instead of the value of the input over (153.0V) is employed, the over level value is added to the data obtained by adding up <br/> previous Rutotomoni, its input
An over flag is set in the force over data (step ST6).

Subsequently, when an average interval of one hour elapses, an average value of power in the average interval is calculated based on the data added up to that time.
And stored in the memory unit 7 (step ST7).

Thereafter, the average value stored in the memory unit 7 is calculated.
Display data and print data are output.
The average value is displayed on the printer unit 9 and the printer unit 10 (step
ST8). Next, 24 hours of average time has passed
It is determined whether or not the average time has elapsed
If not, the process returns to step ST1 to return to each of the above steps.
Is repeated. 24 hours average time
In this case, the value stored in the memory unit 7,
The print data and display data of the total
It is output (step ST10).

Incidentally, in the above step ST8,
If the output of the print data is performed proceeds to the subroutine of FIG. 2, whether over flag by C PU8 is set or not is determined (step ST11), O over bar <br/> Furagu is set data for over mark printing is outputted when you're (step ST12), this
At the same time, the print data of the average value is output (step ST13).

[0023] In this way, the data output of the average value that put the previous average interval ends (step ST14), the over flag is reset (step ST15). Therefore, if an input over occurs during the current average interval, the over flag can be set again.

FIG . 5 shows an example of printing by the printer unit 10.
According to this, the output of the print data of the average value and the over mark, the current in each channel, voltage, power, are printed electric power mean value, and, in part that exceeds the over level value, for example ">" An overmark (indicated by an arrow A in the figure) is printed.

[0025] Thus, for the subject having the power meter, current object to be measured, voltage, it is possible to know the average value of the power, also, its display value by over mark ">"
It can be determined that it is a guide .

Further, in the above step ST8 but the display data is also output, whether in the same manner as described above over flag is set or not is determined (step ST1
6), when the O Bafuragu is set, for example, the electric power mean value is displayed blinking (step ST17),
Normal display, for example, the normal electric power mean value is displayed lit when o Bafuragu is not set (step ST18).

Subsequently, when the over flag is set , the over flag is reset (step ST19), and the subroutine shown in FIG. 2 ends.

In this case, as shown in FIG. 4, during the current average interval, the average value of the power and the like in the previous average interval is displayed, and the over-level value is included in the data sampled in the same average interval. If there is any data that exceeds, the average value will be illuminated and displayed.
It is possible to determine whether or not there is data exceeding the over-level value in the previous data, so that input over is not missed.

[0029]

As described above, according to the present invention,
The input data exceeds the set range over-level value.
The over-level value as the input data value.
Input can cause over-input during average operation.
Even if the average value calculation continues,
Data is not censored, especially when measuring for long periods of time.
You don't have to waste time.

In addition, an over-fla
The average value after the average interval
Is displayed and printed based on the over flag.
Te, flashing displays the average value, also with the over-mark
And prints out
You can easily know where you are and the average
You can also see that it is a guide.

[Brief description of the drawings]

FIG. 1 is a schematic flowchart illustrating a control method applied to a power meter according to an embodiment of the present invention.

FIG. 2 is a schematic flowchart illustrating a control method applied to a power meter according to an embodiment of the present invention.

FIG. 3 is a schematic block diagram of a power meter of the present invention.

FIG. 4 is a schematic time chart illustrating an example of the present invention and illustrating a control method applied to a power meter.

FIG. 5 is a schematic diagram illustrating an average value printed by an average function of a wattmeter according to an embodiment of the present invention.

FIG. 6 is a schematic time chart illustrating an average function of the power meter.

FIG. 7 is a schematic graph illustrating an application example of an average function of a conventional power meter.

FIG. 8 is a schematic graph illustrating an application example of an average function in a conventional power meter.

FIG. 9 is a schematic printing state diagram of an average value by an average function of a conventional wattmeter.

[Explanation of symbols]

 1, 2, 3 Input unit 4, 5, 6 A / D conversion unit 7 Memory unit 8 CPU 9 Display unit 10 Printer unit 11 Bus A Overmark

Claims (1)

(57) [Claims] 1. An analog signal taken from an input section
The A / D converter converts the current and voltage of the measured
Converted into digital data by sampling intervals, the CPU
Based on the above data, the active power and
Calculate power parameters including active power, and
Put within the predetermined time period by averaging function of the CPU
Calculate the average value of the above power parameters and calculate them.
In the method of controlling a wattmeter for displaying a result on a display unit, the CPU may be configured to exceed a set range of the input unit.
-Level value is set, and the CPU
Exceeds the above over-level value,
-Change the data value to the above over-level value and
Continue the value calculation and overwrite the over data
Set the bar flag and perform the above calculation after the predetermined period
The above flag is set when displaying the result
The display is a display when
In this case, the display flashes and the display is a printer.
A method for controlling a wattmeter, wherein an overmark is printed when the power meter is turned on.