CN111896909B - Electric energy meter error correction method and device - Google Patents
Electric energy meter error correction method and device Download PDFInfo
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- CN111896909B CN111896909B CN202010686306.2A CN202010686306A CN111896909B CN 111896909 B CN111896909 B CN 111896909B CN 202010686306 A CN202010686306 A CN 202010686306A CN 111896909 B CN111896909 B CN 111896909B
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- 238000012937 correction Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 13
- 238000005259 measurement Methods 0.000 claims abstract description 14
- 238000012795 verification Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/04—Testing or calibrating of apparatus covered by the other groups of this subclass of instruments for measuring time integral of power or current
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R35/00—Testing or calibrating of apparatus covered by the other groups of this subclass
- G01R35/005—Calibrating; Standards or reference devices, e.g. voltage or resistance standards, "golden" references
- G01R35/007—Standards or reference devices, e.g. voltage or resistance standards, "golden references"
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- General Physics & Mathematics (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention provides an error correction method of an electric energy meter, which comprises the following steps: setting the load power factor of the electric energy meter calibrating device to be 1.0, and applying standard voltage and standard current to a standard meter; obtaining measurement voltage U of standard meter and measurement voltage U of electric energy meter C Calculate the voltage ratio difference B U And according to the voltage of the corrected electric energy meter; according to the measuring current I of the standard meter and the measuring current I of the electric energy meter C Calculating the current ratio difference B I The method comprises the steps of carrying out a first treatment on the surface of the Calculating a relative error r of the electric energy meter and the standard meter; step 5, according to the relative error r and the current ratio difference B of the electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b; and 6, according to the current of the corrected electric energy meter, enabling the measured current of the corrected electric energy meter to be equal to the measured current I of the standard meter.
Description
Technical Field
The invention relates to the field of instrument correction, in particular to an electric energy meter error correction method and device.
Background
Although the voltage-current correction is very accurate compared to the standard table, the error is still large. Designers insist that the voltage and current are accurate, the error is accurate, no more methods and data are provided, the work falls into the dead space, and the explanation of the reason is difficult. Later, the workers observe the field operation, and find that the actual operation steps are to correct the voltage and the current according to a standard table, then finely adjust the current by experience, the error is lower when the current is positive, the error is higher when the current is negative, and the operation is repeated for a plurality of times.
In order to solve the above problems, an ideal technical solution is always sought.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art, and provides an error correction method and device for an electric energy meter, which can correct the error to an ideal range only once.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: an error correction method for an electric energy meter comprises the following steps:
step 1, setting the load power factor of an electric energy meter calibrating device to be 1.0, and applying standard voltage and standard current to a standard meter; the voltage loop of the standard meter is connected with the voltage loop of the electric energy meter in parallel, and the current loop of the standard meter is connected with the current loop of the electric energy meter in series;
step 2, obtaining the measurement voltage U of the standard meter and the measurement voltage U of the electric energy meter C Calculate the voltage ratio difference B U WhereinAnd according to U C (1+B U ) Correcting the voltage of the electric energy meter so that the measured voltage of the corrected electric energy meter is equal to the measured voltage U of the standard meter;
step 3, according to the measuring current I of the standard meter and the measuring current I of the electric energy meter C Calculating the current ratio difference B I Wherein
Step 4, calculating the relative error r of the electric energy meter and the standard meter, wherein,
step 5, according to the relative error r and the current ratio difference B of the electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b, wherein,r / representing an ideal error correction value;
step 6, according to I C (1+B I +b) correcting the current of the electric energy meter so that the measured current of the corrected electric energy meter is equal to the measured current I of the standard meter.
Based on the above, in step 5, r / =0, at this time, the current ratio difference compensation coefficient
Based on the above, before step 1 is performed, correction of the dc voltage of the electric energy meter is performed first;
and (3) after the step (6), setting the load power factor of the electric energy meter calibrating device to be 0.5, and correcting the phase of the electric energy meter.
The invention also provides an error correction device of the electric energy meter, which comprises an electric energy meter verification device and a standard meter, wherein the electric energy meter verification device comprises a voltage and current output module, a voltage ratio difference calculation module, a current ratio difference compensation coefficient calculation module and a correction module,
the voltage and current output module is connected with the standard meter and is used for applying standard voltage and standard current to the standard meter when the load power factor is 1.0 or 0.5;
the voltage loop of the standard meter is connected in parallel with the voltage loop of the at least one electric energy meter, and the current loop of the standard meter is connected in series with the current loop of the at least one electric energy meter;
the voltage ratio difference calculation module is used forObtaining the measurement voltage U of the standard meter and the measurement voltage U of each electric energy meter C Calculating the voltage ratio difference B of each electric energy meter U Wherein
The current ratio difference calculation module is used for measuring the current I according to the standard meter and measuring the current I of each electric energy meter C Calculating the current ratio difference B of each electric energy meter I Wherein
The current ratio difference compensation coefficient calculation module is used for calculating the relative error r of each electric energy meter and the standard meter, and calculating the current ratio difference B according to the relative error r of each electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b of each electric energy meter, wherein,r/represents an ideal error correction value;
the correction module is used for calculating the voltage ratio difference, the current ratio difference and the current ratio difference compensation coefficient according to the measured voltage U of each electric energy meter C Voltage ratio difference B U And formula U C (1+B U ) Calculating a compensation voltage, outputting the compensation voltage to a corresponding electric energy meter, and correcting the voltage of the electric energy meter; for measuring current I from each electric energy meter C Current ratio difference B I Current ratio difference compensation coefficient b and formula I C (1+B I And b) calculating the compensation current, outputting the compensation current to the corresponding electric energy meter, and correcting the electric energy meter current.
Compared with the prior art, the invention has outstanding substantive characteristics and remarkable progress, and in particular, the invention corrects the current ratio difference according to the relative error value of the electric energy meter, thereby correcting the relative error of the electric energy meter to an ideal range only once with high correction efficiency; meanwhile, the correction device can also correct a plurality of electric energy meters at the same time, so that the labor cost and the time cost are saved.
Drawings
FIG. 1 is a flow chart of the correction method according to the present invention.
Fig. 2 is a schematic block diagram of a correction device according to the present invention.
Detailed Description
The technical scheme of the invention is further described in detail through the following specific embodiments.
As shown in fig. 1, the error correction method of the electric energy meter comprises the following steps:
step 1, setting the load power factor of an electric energy meter calibrating device to be 1.0, and applying standard voltage and standard current to a standard meter; the voltage loop of the standard meter is connected with the voltage loop of the electric energy meter in parallel, and the current loop of the standard meter is connected with the current loop of the electric energy meter in series;
step 2, obtaining the measurement voltage U of the standard meter and the measurement voltage U of the electric energy meter C Calculate the voltage ratio difference B U WhereinAnd according to U C (1+B U ) Correcting the voltage of the electric energy meter so that the measured voltage of the corrected electric energy meter is equal to the measured voltage U of the standard meter;
step 3, according to the measuring current I of the standard meter and the measuring current I of the electric energy meter C Calculating the current ratio difference B I Wherein
Step 4, calculating the relative error r of the electric energy meter and the standard meter, wherein,
step 5, according to the relative error r and the current ratio difference B of the electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b, wherein,r / representing an ideal error correction value;
step 6, according to I C (1+B I +b) correcting the current of the electric energy meter so that the measured current of the corrected electric energy meter is equal to the measured current I of the standard meter.
Specifically, if the error is to be corrected to 0 at one time, the ideal error correction value r in step 5 is set / Preset to 0, r / =0, at this time, the current ratio difference compensation coefficient
Specifically, before the step 1 is performed, the direct current voltage of the electric energy meter is corrected;
after the step 6 is carried out, setting the load power factor of the electric energy meter calibrating device to be 0.5, and correcting the phase of the electric energy meter;
through the steps, the relative error of the electric energy meter detection device is corrected to be 0.
The invention also provides an error correction device of the electric energy meter, as shown in figure 2, comprising an electric energy meter verification device and a standard meter, wherein the electric energy meter verification device comprises a voltage and current output module, a voltage comparison difference calculation module, a current comparison difference compensation coefficient calculation module and a correction module,
the voltage and current output module is connected with the standard meter and is used for applying standard voltage and standard current to the standard meter when the load power factor is 1.0 or 0.5;
the voltage loop of the standard meter is connected in parallel with the voltage loop of the at least one electric energy meter, and the current loop of the standard meter is connected in series with the current loop of the at least one electric energy meter;
the voltage ratio difference calculation module is used for obtaining the measurement voltage U of the standard meter and the measurement voltage U of each electric energy meter C Calculating the voltage ratio difference B of each electric energy meter U Wherein
The current ratio difference calculation module is used for measuring the current I according to the standard meter and measuring the current I of each electric energy meter C Calculating the current ratio difference B of each electric energy meter I Wherein
The current ratio difference compensation coefficient calculation module is used for calculating the relative error r of each electric energy meter and the standard meter, and calculating the current ratio difference B according to the relative error r of each electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b of each electric energy meter, wherein,r / representing an ideal error correction value;
the correction module is used for calculating the voltage ratio difference, the current ratio difference and the current ratio difference compensation coefficient according to the measured voltage U of each electric energy meter C Voltage ratio difference B U And formula U C (1+B U ) Calculating a compensation voltage, outputting the compensation voltage to a corresponding electric energy meter, and correcting the voltage of the electric energy meter; for measuring current I from each electric energy meter C Current ratio difference B I Current ratio difference compensation coefficient b and formula I C (1+B I And b) calculating the compensation current, outputting the compensation current to the corresponding electric energy meter, and correcting the electric energy meter current.
Finally, it should be noted that the above-mentioned embodiments are only for illustrating the technical scheme of the present invention and are not limiting; while the invention has been described in detail with reference to the preferred embodiments, those skilled in the art will appreciate that: modifications may be made to the specific embodiments of the present invention or equivalents may be substituted for part of the technical features thereof; without departing from the spirit of the invention, it is intended to cover the scope of the invention as claimed.
Claims (4)
1. The error correction method for the electric energy meter is characterized by comprising the following steps of:
step 1, setting the load power factor of an electric energy meter calibrating device to be 1.0, and applying standard voltage and standard current to a standard meter; the voltage loop of the standard meter is connected with the voltage loop of the electric energy meter in parallel, and the current loop of the standard meter is connected with the current loop of the electric energy meter in series;
step 2, obtaining the measurement voltage U of the standard meter and the measurement voltage U of the electric energy meter C Calculate the voltage ratio difference B U WhereinAnd according to U C (1+B U ) Correcting the voltage of the electric energy meter so that the measured voltage of the corrected electric energy meter is equal to the measured voltage U of the standard meter;
step 3, according to the measuring current I of the standard meter and the measuring current I of the electric energy meter C Calculating the current ratio difference B I Wherein
Step 4, calculating the relative error r of the electric energy meter and the standard meter, wherein,
step 5, according to the relative error r and the current ratio difference B of the electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b, wherein,r / representing an ideal error correction value;
step 6, according to I C (1+B I +b) correcting the current of the electric energy meter so that the measured current of the corrected electric energy meter is equal to the measured current I of the standard meter.
2. The method for correcting errors of an electric energy meter according to claim 1, wherein: in step 5, r / =0, at this time, currentCompensation coefficient of ratio difference
3. The method for correcting errors of an electric energy meter according to claim 1, wherein:
before the step 1 is carried out, correcting the direct current voltage of the electric energy meter;
and (3) after the step (6), setting the load power factor of the electric energy meter calibrating device to be 0.5, and correcting the phase of the electric energy meter.
4. An electric energy meter error correction device which is characterized in that: comprises an electric energy meter calibrating device and a standard meter, wherein the electric energy meter calibrating device comprises a voltage and current output module, a voltage ratio difference calculation module, a current ratio difference compensation coefficient calculation module and a correction module,
the voltage and current output module is connected with the standard meter and is used for applying standard voltage and standard current to the standard meter when the load power factor is 1.0 or 0.5;
the voltage loop of the standard meter is connected in parallel with the voltage loop of the at least one electric energy meter, and the current loop of the standard meter is connected in series with the current loop of the at least one electric energy meter;
the voltage ratio difference calculation module is used for obtaining the measurement voltage U of the standard meter and the measurement voltage U of each electric energy meter C Calculating the voltage ratio difference B of each electric energy meter U Wherein
The current ratio difference calculation module is used for measuring the current I according to the standard meter and measuring the current I of each electric energy meter C Calculating the current ratio difference B of each electric energy meter I Wherein
The current ratio difference compensation coefficient calculation module is used for calculating the relative error r of each electric energy meter and the standard meter, and calculating the current ratio difference B according to the relative error r of each electric energy meter and the standard meter I Calculating a current ratio difference compensation coefficient b of each electric energy meter, wherein,r / representing an ideal error correction value;
the correction module is used for calculating the voltage ratio difference, the current ratio difference and the current ratio difference compensation coefficient according to the measured voltage U of each electric energy meter C Voltage ratio difference B U And formula U C (1+B U ) Calculating a compensation voltage, outputting the compensation voltage to a corresponding electric energy meter, and correcting the voltage of the electric energy meter; for measuring current I from each electric energy meter C Current ratio difference B I Current ratio difference compensation coefficient b and formula I C (1+B I And b) calculating the compensation current, outputting the compensation current to the corresponding electric energy meter, and correcting the electric energy meter current.
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| CN114545072B (en) * | 2021-12-27 | 2022-11-08 | 杭州明特科技有限公司 | Reactive power compensation method, electric energy meter and computer readable storage medium |
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