CN117724031B - High-efficiency calibration method for measuring precision of electronic electric energy meter - Google Patents
High-efficiency calibration method for measuring precision of electronic electric energy meter Download PDFInfo
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Abstract
The invention discloses a high-efficiency calibration method for measuring precision of an electronic electric energy meter, which relates to the technical field of electric energy meter calibration and comprises the steps of outputting a plurality of groups of measuring currents; outputting a detection duration and an actual power supply amount based on the calculation result; supplying power to the electric energy meter based on the detection duration, the measurement current and the rated voltage, and obtaining the reading of the electric energy meter; establishing a bias current scatter diagram based on the measured current and the bias power, wherein the bias current scatter diagram comprises bias current; analyzing and calculating the deviation electric energy in the bias current point group, outputting an accuracy calibration value based on a calculation result, and calibrating the electric energy meter based on the accuracy calibration value; the method and the device are used for solving the problems that the calibration efficiency of the electric energy meter is insufficient and the energy consumption of the calibration is excessive because the power supply time is lack to analyze in the existing electric energy meter calibration technology, so that the long-time continuous power supply is needed before the calibration is completed.
Description
Technical Field
The invention relates to the technical field of electric energy meter calibration, in particular to a high-efficiency calibration method for measuring accuracy of an electronic electric energy meter.
Background
An electronic electric energy meter is a device for measuring and recording electric energy consumption, and uses electronic technology to realize measurement and metering of electric energy; compared with the traditional mechanical electric energy meter, the electronic electric energy meter has higher accuracy, wider measurement range and more functional characteristics; the electronic electric energy meter adopts microelectronic technology, digital circuit and signal processing technology, converts electric energy into voltage or current signals, and obtains accurate electric energy consumption data through accurate sampling, calculation and processing.
The existing improvement for electric energy meter calibration is to generally improve the accuracy of electric energy meter calibration, so that the measurement accuracy of the electric energy meter is higher, for example, in Chinese patent with the invention publication number of CN112946560A, an electric energy meter calibration method, an electric energy meter calibration device, an electric energy meter and an electric energy meter system are disclosed, and the scheme is that a gain curve is obtained through calculation by acquiring standard current and corresponding real-time current, and further calibration parameters are obtained for calibration; other improvements in calibration of electric energy meters are usually used for more accurate calibration of electric energy meters in a large range, and lack of analysis of the power supply time required for calibration of electric energy meters can lead to continuous power supply before calibration is completed, and in practice, the efficiency of calibration can be affected and the waste of energy sources can be increased.
Disclosure of Invention
The invention aims to solve at least one of the technical problems in the prior art to a certain extent, and aims to solve the problems that the calibration efficiency of the electric energy meter is insufficient and the energy consumption is excessive because long-time continuous power supply is required before the calibration is completed due to the fact that the analysis of the power supply time is lacked in the prior art by improving the calibration method of the electronic electric energy meter.
In order to achieve the above purpose, the present invention provides a method for efficiently calibrating measurement accuracy of an electronic electric energy meter, comprising:
Acquiring rated voltage, minimum bit number and calibration current of the electric energy meter, calculating and dividing the calibration current, and outputting a plurality of groups of measurement currents;
Calculating the minimum bit number, the measured current and the rated voltage, and outputting the detection duration and the actual power supply amount based on the calculation result;
Supplying power to the electric energy meter based on the detection duration, the measurement current and the rated voltage, and obtaining the reading of the electric energy meter; calculating and analyzing the readings of the electric energy meter and the actual power supply quantity, and outputting deviation electric energy based on a calculation and analysis result;
establishing a bias current scatter diagram based on the measured current and the bias power, wherein the bias current scatter diagram comprises bias current; calculating a plurality of slopes in the bias current scatter diagram, and marking the dividing slopes; analyzing the dividing slope, and outputting bias current point groups based on an analysis result;
Analyzing and calculating the deviation electric energy in the bias current point group, and outputting an accuracy calibration value based on a calculation result; and calibrating the electric energy meter based on the precision calibration value.
Further, obtaining rated voltage, minimum bit number and calibration current of the electric energy meter, calculating and dividing the calibration current, and outputting a plurality of groups of measurement currents comprises:
Obtaining rated voltage, minimum bit number and calibration current of the electric energy meter, wherein the minimum bit number is the minimum range unit of the electric energy meter, and the calibration current comprises basic current and maximum current;
calculating the difference between the maximum current and the basic current, and marking the difference as a partitionable value;
calculating the ratio of the maximum current to the basic current, and marking the ratio as a number ratio;
calculating the quotient of the divisible value divided by the quantity ratio, and marking the quotient as a unit divisible value after upwards rounding the quotient;
dividing the partitionable value according to the unit partition value to obtain a plurality of groups of intervals, calculating the median value of each interval, and marking the median value as the measured current.
Further, calculating the minimum bit number, the measured current and the rated voltage, and outputting the detection duration based on the calculation result includes:
calculating to obtain a detection duration by using a duration calculation formula;
The duration calculation formula is configured as follows: ; JT is the detection duration, K is a constant, lm is the minimum bit number, U is the rated voltage, ii is the ith measurement current, and i is a positive integer.
Further, calculating the minimum number of bits, the measured current, and the rated voltage, and outputting the actual power supply amount based on the calculation result includes:
Calculating to obtain the actual power supply quantity by using an electric energy calculation formula;
The electric energy calculation formula is configured as follows: ; wherein W is the actual power supply quantity,/> To round the symbol up.
Further, based on the detection duration, the measured current, and the rated voltage, powering the electric energy meter, obtaining the electric energy meter reading includes:
The method comprises the steps of connecting an electric energy meter with a standard power supply in a line way, wherein the standard power supply is provided with a parameter setting panel, a timer and a switch; the parameter setting panel can set the voltage and current of the standard power supply; the switch can control the standard power supply to supply power or stop supplying power; the timer can time the power supply time of the standard power supply, and when the timer is reached, the control switch is disconnected, so that the standard power supply stops supplying power;
Setting the voltage as rated voltage, the current as measured current and the timing time of the timer as detection duration in a parameter setting panel;
And closing the switch, controlling the timer to start timing, and acquiring the reading of the electric energy meter when the switch is opened.
Further, the calculating and analyzing the electric energy meter reading and the actual power supply quantity, and outputting the deviation electric energy based on the calculating and analyzing result comprises the following steps:
calculating the difference between the reading of the electric energy meter and the actual power supply quantity, judging whether the calculated result is a negative number, and adding a plus sign before the calculated result when the calculated result is not the negative number, and marking the electric energy meter as deviation electric energy;
and when the power is negative, taking an absolute value of the calculated result, and marking the absolute value as deviation power.
Further, a bias current scatter diagram is established based on the measured current and the bias power, a plurality of slopes in the bias current scatter diagram are calculated, and the mark dividing slope comprises:
Establishing a bias current scatter diagram by taking the measured current as an abscissa and the bias power as an ordinate, and marking the scatter diagram as bias current points;
Starting according to the increasing direction of the abscissa, performing binary linear function fitting on every two adjacent bias current points to obtain a fitting function, obtaining the slope of the fitting function, and marking the slope as an analysis slope; numbering the analysis slopes, wherein the analysis slopes are respectively numbered from the 1st analysis slope to the a-th analysis slope;
Judging whether the analysis slope is zero, and marking the analysis slope as a b-th division slope when the analysis slope is not zero; wherein b is any one of 1 to a which is the same as the analysis slope number;
when the analysis slope is zero, the b-th division slope of the bias current point close to the origin in the two bias current points is obtained, the analysis slope is updated to be the division slope, and the reference sign is the b+1-th division slope.
Further, analyzing the division slope, outputting a slope packet based on the analysis result includes:
dividing the slope size into an ordinate by taking the number size as an abscissa, and establishing a slope line graph;
Setting a floating coefficient for each divided slope to obtain a slope interval; when the overlapping part exists in the two slope intervals, marking the two slope intervals as the same interval; calculating the occurrence frequency of each slope interval;
when the occurrence frequency is smaller than or equal to a slope interval of a first frequency, two bias current points corresponding to the slope interval and used for calculating and dividing the slope are obtained, and bias current points, the positions of which are close to the right in a bias current scatter diagram, of the two bias current points are marked as dividing points;
dividing bias current points in the bias current scatter diagram according to dividing points, and outputting bias current point groups.
Further, the precision calibration value includes a grouping calibration value, analyzing and calculating the deviation electric energy in the bias current point grouping, and outputting the precision calibration value based on the calculation result includes:
Acquiring all deviation electric energy in the bias current point group, and judging whether symbols exist before the deviation electric energy; when the plus sign exists, the processing is not performed, and when the plus sign does not exist, the deleting processing is performed on the deviation electric energy;
the average value of the remaining bias power is calculated and marked as a group calibration value.
Further, calibrating the electric energy meter based on the precision calibration value includes:
all bias current points are grouped into a current interval:
Obtaining the measurement current with the minimum value and the maximum value of the current value of the bias current point in the bias current point group; marking the minimum to maximum measured current as a current interval;
and acquiring real-time current of the electric energy meter during actual measurement, judging which group of current intervals the real-time current is positioned in, setting the current interval in which the real-time current is positioned as a current calibration interval, and subtracting a grouping calibration value corresponding to the current calibration interval from a calculation result when calculating the power supply quantity.
The invention has the beneficial effects that: according to the invention, the calibration current of the electric energy meter is obtained, the calibration current is calculated and divided, and a plurality of groups of measurement currents are output; calculating the minimum bit number, the measured current and the rated voltage, and outputting the detection duration and the actual power supply amount based on the calculation result; the method has the advantages that the determined measurement current number can be obtained by dividing the calibration current, then different measurement currents are calculated to obtain the detection duration required by each measurement current, the timer of the standard power supply is set to automatically cut off power when the power supply time reaches the detection duration, the reading of the electric energy meter is stored, the measurement current and the power supply time are reset after the storage is completed, and the acquisition efficiency in the data acquisition process can be improved;
The invention also analyzes the dividing slope by establishing a bias current scatter diagram, outputs slope groups, calculates an accuracy calibration value and calibrates the electric energy meter; the method has the advantages that after the current is divided into different measured currents through the pre-step, whether the errors of the electric energy meter in different current ranges are similar or not can be analyzed according to the dividing slope, and the errors are grouped and the bias current point grouping is output; and calculating the average value of all deviation electric energy in the bias current point group, taking the reciprocal of the average value, and finally multiplying the reciprocal by one in an electric energy calculation formula of the electric energy meter, so that the calibration coefficient adapting to the current can be provided in different current ranges, and the accuracy of calibrating the electric energy meter is improved.
Additional features and advantages of the application will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the application. The objectives and other advantages of the application will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
FIG. 1 is a flow chart of the steps of the method of the present invention.
FIG. 2 is a schematic diagram of a bias current scattergram of the present invention.
FIG. 3 is a schematic diagram of a slope line graph of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In embodiment 1, referring to fig. 1, the present invention provides a method for calibrating measurement accuracy of an electronic electric energy meter, comprising:
Step S1, obtaining rated voltage, minimum bit number and calibration current of an electric energy meter, calculating and dividing the calibration current, and outputting a plurality of groups of measurement currents; step S1 further comprises the following sub-steps:
Step S101, obtaining rated voltage, minimum bit number and calibration current of an electric energy meter, wherein the minimum bit number is the minimum range unit of the electric energy meter, and the calibration current comprises basic current and maximum current;
it should be noted that, the basic current is the current of the ammeter start metering, the smaller the basic current is, the higher the sensitivity of the ammeter is, and the minimum value of the measured current should not be smaller than the basic current; the maximum current is the maximum current value which can be passed by the electric energy meter under the requirement of being capable of meeting accurate measurement, and the measured current is not more than the maximum current;
Step S102, calculating the difference value between the maximum current and the basic current, and marking the difference value as a partitionable value;
Step S103, calculating the ratio of the maximum current to the basic current, and marking the ratio as a number ratio;
step S104, calculating a quotient of the divisible value divided by the quantity ratio, and marking the quotient as a unit divisible value after upwards rounding;
step S105, dividing the divisible value according to the unit divisible value to obtain a plurality of groups of intervals, calculating the median value of each interval, and marking the median value as a measurement current;
it should be noted that, in the implementation, if further detailed analysis is desired to be performed on the measured current, the quotient of the divisible value and the number ratio of two times or other times is calculated when the unit division value is calculated, and then the unit division value is obtained after the quotient is rounded up, and the specific multiple is determined by a professional implementation personnel;
in addition, the obtained measuring currents are not suitable for more than 20 groups, and when the obtained measuring currents are exceeded, as each group of measuring currents are separately detected on the electric energy meter, the more the number of groups is, the more time is needed, the calibration efficiency and the calibration precision are comprehensively considered, and the measuring currents are not suitable for more than 20 groups;
Step S2, calculating the minimum bit number, the measured current and the rated voltage, and outputting the detection duration and the actual power supply amount based on the calculation result; step S2 further comprises the following sub-steps:
step S201, calculating to obtain a detection duration by using a duration calculation formula;
the time length calculation formula is configured as follows: ; JT is the detection duration, K is a constant, lm is the minimum bit number, U is the rated voltage, ii is the ith measurement current, and i is a positive integer;
In the specific implementation, K is set to 10000, specifically 10X 1000W/h; kxLm represents the electric energy required to be measured to obtain 10 times of the minimum bit number; u x Ii represents the power supplied, for example, when U is 220V and Ii is 5A, U x Ii represents the power supplied is 1100W, and when the minimum bit number is 0.01, JT is 163s, which means that 324s is needed for the electric energy meter to record the actual power supply quantity of 0.1 degree under the parameter range of 220V and 5A; at the moment, if the error coefficient of the electric energy meter is 0.1, the reading of the electric energy meter is 0.11;
If the rated voltage is 220V and the measured electric currents are 5a,10A,15a and 20A, respectively, the calculated JTs correspond to: 327.28s,163.64s,109.1s,81.82s;
It should be noted that, K is set to 10000, which is a value obtained by comprehensively considering the calibration efficiency and the calibration accuracy, but the requirement on the other side can be increased under the condition of losing the requirement on the one side; for example, when higher calibration efficiency is required, the K setting needs to be reduced to achieve the effect of reducing the detection duration, and the specific reduction value is determined by the required precision; similarly, when higher accuracy is required, K needs to be increased;
step S202, calculating to obtain the actual power supply quantity by using a power calculation formula;
the electric energy calculation formula is configured as follows: ; wherein W is the actual power supply quantity;
it should be noted that, when the electronic electric energy meter is used for metering, the pulse constant is usually calculated so as to obtain metering, but in practical application, the current and the voltage in the circuit of the electric energy meter are changed at any moment, and the electric energy calculation formula is only used for calculating the actual power supply amount in the step and is not applicable to other application scenes;
In order to adapt to the precision of the timers of different standard power supply configurations, the value of the JT needs to be rounded up, and if the measured current is larger, the measured current may be additionally measured to be a minimum unit reading, so that an actual power supply amount formula needs to be checked;
Step S3, supplying power to the electric energy meter based on the detection duration, the measurement current and the rated voltage, and obtaining the reading of the electric energy meter; calculating and analyzing the readings of the electric energy meter and the actual power supply quantity, and outputting deviation electric energy based on a calculation and analysis result; step S3 further comprises the following sub-steps:
Step S301, connecting an electric energy meter with a standard power supply in a line way, wherein the standard power supply is provided with a parameter setting panel, a timer and a switch; the parameter setting panel can set the voltage and current of the standard power supply; the switch can control the standard power supply to supply power or stop supplying power; the timer can time the power supply time of the standard power supply, and when the timer is reached, the control switch is disconnected, so that the standard power supply stops supplying power;
step S302, setting the voltage as rated voltage, the current as measured current and the timing time of a timer as detection duration in a parameter setting panel;
step S303, the switch is closed, the timer is controlled to start timing, and when the switch is opened, the reading of the electric energy meter is obtained;
After the reading of the electric energy meter is obtained, the reading of the electric energy meter is zeroed, and meanwhile, the current of the standard power supply and the timing time of the timer are reset; after the setting is completed, a switch is started to carry out measurement steps under different measurement currents;
step S304, calculating the difference between the reading of the electric energy meter and the actual power supply quantity, judging whether the calculated result is negative, and adding a plus sign before the calculated result when the calculated result is not negative, and marking the electric energy as deviation electric energy;
step S305, when the number is negative, taking an absolute value of the calculation result, and marking the absolute value as deviation electric energy;
It should be noted that, whether the difference is negative is to perform the distinguishing process in the subsequent step; the specific processing method and purpose are described in the subsequent steps;
referring to fig. 2 and 3, each circular area in fig. 2 is a deflection point;
S4, a bias current scatter diagram is established based on the measured current and the bias power, wherein the bias current scatter diagram comprises bias current; calculating a plurality of slopes in the bias current scatter diagram, and marking the dividing slopes; analyzing the dividing slope, and outputting bias current point groups based on an analysis result; step S4 further comprises the sub-steps of:
Step S401, a bias current scatter diagram is established by taking the measured current as an abscissa and the bias power as an ordinate, and the scatter in the diagram is marked as a bias current point;
Step S402, starting according to the increasing direction of the abscissa, performing binary primary function fitting on every two adjacent bias current points to obtain a fitting function, and obtaining the slope of the fitting function, wherein the slope is marked as an analysis slope; numbering the analysis slopes, wherein the analysis slopes are respectively numbered from the 1 st analysis slope to the a-th analysis slope;
Step S403, judging whether the analysis slope is zero, and marking the analysis slope as a b-th division slope when the analysis slope is not zero; wherein b is any one of 1 to a which is the same as the analysis slope number;
When marking the analysis slope, b is increased by 1 each time from 1, and finally reaches a;
Step S404, when the analysis slope is zero, obtaining the b-th division slope of the bias current point close to the origin point in the two bias current points, updating the analysis slope to the division slope, and marking the division slope as b+1;
It should be noted that, because the electronic electric energy meter calculates the pulse constant to realize measurement, other parameters in the circuit change due to different current values during calculation, so that in a certain current value range, the error coefficients have slight differences, so that the dividing slopes are not completely the same;
And when the two measuring currents are completely identical, the error coefficients are identical, the same calibration coefficient can be used for calibration, therefore, the analysis slope is updated to be a division slope, and three bias current points corresponding to the two division slopes are divided into the same group in the subsequent grouping step;
Step S405, dividing the slope size into ordinate with the number size as the abscissa, and establishing a slope line diagram;
Step S406, setting a floating coefficient for each divided slope to obtain a slope interval; when the overlapping part exists in the two slope intervals, marking the two slope intervals as the same interval; calculating the occurrence frequency of each slope interval;
In specific implementation, the floating coefficient is set to be 0.1 times of the partition slope, and the slope interval is obtained by multiplying the partition slope by 0.9 as the interval left end point and multiplying the partition slope by 1.1 as the interval right end point; the floating coefficient is set in relation to the dividing slope, for example, in the case of 5A to 10A measured current grouping, the error coefficient of the electric energy meter gradually rises from 0.05 to 0.06, and when the measured current is more than 10A and enters the second gear error coefficient of the electric energy meter, the error coefficient is 0.07, so that obvious difference exists between the dividing slope of 9A and 10A and the dividing slope of 10A and 11A, and the difference can be intuitively judged by comparing the difference with the dividing slope of 8A and 9A;
the floating coefficient is set for calculating the step of intuitively judging and obtaining the dividing points through data-supported operation;
when the occurrence frequency is smaller than or equal to a slope interval of a first frequency, two bias current points corresponding to the slope interval and used for calculating and dividing the slope are obtained, and bias current points, the positions of which are close to the right in a bias current scatter diagram, of the two bias current points are marked as dividing points;
In practice, the first frequency is set to 0.1; setting the first frequency and determining the total slope interval number, wherein the maximum first frequency is not more than 0.1 when the total slope interval number is larger, and the maximum first frequency is not more than 0.33 when the total slope interval number is smaller, because the first frequency is properly increased; for example, if there is a different slope interval when the total slope interval number is 5, the first frequency is set to 0.2; when there are only three slope intervals, there is a different slope interval, at which the first frequency is set to 0.33;
the specific setting value is in the range of 0.1 to 0.34 and is determined by the specific application scene;
Step S407, dividing bias current points in the bias current scatter diagram according to dividing points, and outputting bias current point groups;
S5, analyzing and calculating the deviation electric energy in the bias current point group, outputting an accuracy calibration value based on a calculation result, and calibrating the electric energy meter based on the accuracy calibration value; step S5 further comprises the sub-steps of:
Step S501, obtaining all deviation electric energy in bias current point groups, and judging whether symbols exist before the deviation electric energy; when the plus sign exists, the processing is not performed, and when the plus sign does not exist, the deleting processing is performed on the deviation electric energy;
It should be noted that, the error coefficient is determined by the calculation mode of the electric energy meter measurement, so that the electric energy meter reading is larger than the actual power supply amount for a while and smaller than the actual power supply amount for a while; in the step, the default is positive at the same time, and when the deviation electric energy with negative number appears, the abnormal data of the deviation electric energy, which is caused by errors, can be judged, and the abnormal data is deleted;
Step S502, calculating an average value of residual deviation electric energy, and marking the average value as a grouping calibration value;
Step S503, grouping all bias current points into a current interval:
Obtaining the measurement current with the minimum value and the maximum value of the current value of the bias current point in the bias current point group; marking the minimum to maximum measured current as a current interval;
Step S504, obtaining real-time current when the electric energy meter actually measures, judging which group of current intervals the real-time current is located in, setting the current interval in which the real-time current is located as a current calibration interval, and subtracting a grouping calibration value corresponding to the current calibration interval from a calculation result when calculating the power supply quantity.
Embodiment 2 is different from embodiment 1 in that when the normal positive and negative values of the deviation power are changed from positive to negative values according to different error coefficients, deletion processing is required for different deviation powers, specifically:
Acquiring all deviation electric energy in the bias current point group, and judging whether symbols exist before the deviation electric energy; when the plus sign exists, deleting the deviation electric energy, and when the plus sign does not exist, not processing;
the average value of the remaining bias power is calculated and marked as a group calibration value.
Embodiment 3 is different from embodiment 1 in that, when calculating the average value of the remaining deviation electric energy, if the deviation electric energy shows a variation trend similar to an equal ratio, and the calculation result is calibrated by addition and subtraction, the calibration result is not accurate enough, so the embodiment provides a method for calibrating by multiplication and division, specifically:
Calculating the average value of the residual deviation electric energy, taking the reciprocal of the average value, and marking the reciprocal as the average reciprocal;
all bias current points are grouped into a current interval:
Obtaining the measurement current with the minimum value and the maximum value of the current value of the bias current point in the bias current point group; marking the minimum to maximum measured current as a current interval;
Acquiring real-time current of the electric energy meter during actual measurement, judging which group of current intervals the real-time current is located in, and when the first power supply quantity is obtained through calculation, subtracting the average reciprocal of the current intervals from the first power supply quantity, and marking as being applied to measurement; calculating the ratio of the metering to the first power supply quantity, and marking the ratio as a grouping calibration value;
when the electric energy meter is controlled to measure by using a formula, the grouping calibration value corresponding to the real-time current is multiplied in the formula.
In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media having computer-usable program code embodied therein. The storage medium may be implemented by any type of volatile or non-volatile Memory device or combination thereof, such as static random access Memory (Static Random Access Memory, SRAM), electrically erasable Programmable Read-Only Memory (ELECTRICALLY ERASABLE PROGRAMMABLE READ-Only Memory, EEPROM), erasable Programmable Read-Only Memory (Erasable Programmable Read Only Memory, EPROM), programmable Read-Only Memory (PROM), read-Only Memory (ROM), magnetic Memory, flash Memory, magnetic disk, or optical disk. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
Claims (8)
1. The high-efficiency calibration method for the measurement precision of the electronic electric energy meter is characterized by comprising the following steps of:
Obtaining rated voltage, minimum bit number and calibration current of the electric energy meter, wherein the minimum bit number is the minimum measuring range unit of the electric energy meter, calculating and dividing the calibration current, and outputting a plurality of groups of measurement currents;
Calculating the minimum bit number, the measured current and the rated voltage, and outputting the detection duration and the actual power supply amount based on the calculation result;
Supplying power to the electric energy meter based on the detection duration, the measurement current and the rated voltage, and obtaining the reading of the electric energy meter; calculating and analyzing the readings of the electric energy meter and the actual power supply quantity, and outputting deviation electric energy based on a calculation and analysis result;
establishing a bias current scatter diagram based on the measured current and the bias power, wherein the bias current scatter diagram comprises bias current; calculating a plurality of slopes in the bias current scatter diagram, and marking the dividing slopes; analyzing the dividing slope, and outputting bias current point groups based on an analysis result;
Establishing a bias current scatter diagram based on the measured current and the bias power, calculating a plurality of slopes in the bias current scatter diagram, and marking the slopes includes:
Establishing a bias current scatter diagram by taking the measured current as an abscissa and the bias power as an ordinate, and marking the scatter diagram as bias current points;
Starting according to the increasing direction of the abscissa, performing binary linear function fitting on every two adjacent bias current points to obtain a fitting function, obtaining the slope of the fitting function, and marking the slope as an analysis slope; numbering the analysis slopes, wherein the analysis slopes are respectively numbered from the 1st analysis slope to the a-th analysis slope;
Judging whether the analysis slope is zero, and marking the analysis slope as a b-th division slope when the analysis slope is not zero; wherein b is any one of 1 to a which is the same as the analysis slope number;
When the analysis slope is zero, a b-th division slope of a bias current point close to the origin in the two bias current points is obtained, the analysis slope is updated to be a division slope, and the reference sign is b+1-th division slope;
analyzing the dividing slope and outputting the slope group based on the analysis result comprises:
dividing the slope size into an ordinate by taking the number size as an abscissa, and establishing a slope line graph;
Setting a floating coefficient for each divided slope to obtain a slope interval; when the overlapping part exists in the two slope intervals, marking the two slope intervals as the same interval; calculating the occurrence frequency of each slope interval;
when the occurrence frequency is smaller than or equal to a slope interval of a first frequency, two bias current points corresponding to the slope interval and used for calculating and dividing the slope are obtained, and bias current points, the positions of which are close to the right in a bias current scatter diagram, of the two bias current points are marked as dividing points;
Dividing bias current points in the bias current scatter diagram according to dividing points, and outputting bias current point groups;
And analyzing and calculating the deviation electric energy in the bias current point group, outputting an accuracy calibration value based on a calculation result, and calibrating the electric energy meter based on the accuracy calibration value.
2. The method for efficiently calibrating measurement accuracy of an electronic electric energy meter according to claim 1, wherein obtaining a rated voltage, a minimum bit number and a calibration current of the electric energy meter, calculating and dividing the calibration current, and outputting a plurality of groups of measurement currents comprises:
Obtaining rated voltage, minimum bit number and calibration current of the electric energy meter, wherein the calibration current comprises basic current and maximum current;
calculating the difference between the maximum current and the basic current, and marking the difference as a partitionable value;
calculating the ratio of the maximum current to the basic current, and marking the ratio as a number ratio;
calculating the quotient of the divisible value divided by the quantity ratio, and marking the quotient as a unit divisible value after upwards rounding the quotient;
dividing the partitionable value according to the unit partition value to obtain a plurality of groups of intervals, calculating the median value of each interval, and marking the median value as the measured current.
3. The method for efficiently calibrating measurement accuracy of an electronic electric energy meter according to claim 2, wherein calculating the minimum number of bits, the measured current, and the rated voltage, and outputting the detection time based on the calculation result comprises:
calculating to obtain a detection duration by using a duration calculation formula;
The duration calculation formula is configured as follows: ; JT is the detection duration, K is a constant, lm is the minimum bit number, U is the rated voltage, ii is the ith measurement current, and i is a positive integer.
4. The method for efficiently calibrating measurement accuracy of an electronic power meter according to claim 3, wherein calculating a minimum number of bits, a measured current, and a rated voltage, and outputting an actual power supply amount based on a calculation result comprises:
Calculating to obtain the actual power supply quantity by using an electric energy calculation formula;
The electric energy calculation formula is configured as follows: ; wherein W is the actual power supply quantity,/> To round the symbol up.
5. The method for efficient calibration of measurement accuracy of an electronic power meter of claim 4, wherein powering the power meter based on the detection duration, the measurement current, and the rated voltage, the obtaining the power meter reading comprises:
The method comprises the steps of connecting an electric energy meter with a standard power supply in a line way, wherein the standard power supply is provided with a parameter setting panel, a timer and a switch; the parameter setting panel can set the voltage and current of the standard power supply; the switch can control the standard power supply to supply power or stop supplying power; the timer can time the power supply time of the standard power supply, and when the timer is reached, the control switch is disconnected, so that the standard power supply stops supplying power;
Setting the voltage as rated voltage, the current as measured current and the timing time of the timer as detection duration in a parameter setting panel;
And closing the switch, controlling the timer to start timing, and acquiring the reading of the electric energy meter when the switch is opened.
6. The method for efficient calibration of measurement accuracy of an electronic power meter according to claim 5, wherein the steps of calculating and analyzing the power meter reading and the actual power supply amount, and outputting the deviation power based on the calculation and analysis result comprise:
calculating the difference between the reading of the electric energy meter and the actual power supply quantity, judging whether the calculated result is a negative number, and adding a plus sign before the calculated result when the calculated result is not the negative number, and marking the electric energy meter as deviation electric energy;
and when the power is negative, taking an absolute value of the calculated result, and marking the absolute value as deviation power.
7. The method of claim 6, wherein the precision calibration values comprise grouping calibration values, analyzing and calculating the deviation electric energy in the bias current point group, and outputting the precision calibration values based on the calculation result comprises:
Acquiring all deviation electric energy in the bias current point group, and judging whether symbols exist before the deviation electric energy; when the plus sign exists, the processing is not performed, and when the plus sign does not exist, the deleting processing is performed on the deviation electric energy;
the average value of the remaining bias power is calculated and marked as a group calibration value.
8. The method for efficiently calibrating measurement accuracy of an electronic power meter according to claim 7, wherein calibrating the power meter based on the accuracy calibration value comprises:
all bias current points are grouped into a current interval:
Obtaining the measurement current with the minimum value and the maximum value of the current value of the bias current point in the bias current point group; marking the minimum to maximum measured current as a current interval;
and acquiring real-time current of the electric energy meter during actual measurement, judging which group of current intervals the real-time current is positioned in, setting the current interval in which the real-time current is positioned as a current calibration interval, and subtracting a grouping calibration value corresponding to the current calibration interval from a calculation result when calculating the power supply quantity.
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