CN102928812A - Calibration method and device for electric energy meter - Google Patents
Calibration method and device for electric energy meter Download PDFInfo
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- CN102928812A CN102928812A CN2012104784305A CN201210478430A CN102928812A CN 102928812 A CN102928812 A CN 102928812A CN 2012104784305 A CN2012104784305 A CN 2012104784305A CN 201210478430 A CN201210478430 A CN 201210478430A CN 102928812 A CN102928812 A CN 102928812A
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Abstract
The invention discloses a calibration method for an electric energy meter. The calibration method comprises the following steps: setting a meter calibration task parameter and a meter calibration error threshold of the electric energy meter; monitoring calibration information in the calibration process of the electric energy meter; acquiring the meter calibration error of the electric energy meter according to the calibration information; re-calibrating the electric energy meter if the meter calibration error is larger than the meter calibration error threshold; and completing meter calibration if the meter calibration error is smaller than or equal to the meter calibration error threshold. The invention also discloses a calibration device for the electric energy meter. The calibration method and the calibration device for the electric energy meter, which are disclosed by the invention, can promptly discover errors caused in the meter calibration process through monitoring the meter calibration process, thereby realizing accurate calibration of the electric energy meter.
Description
Technical field
The present invention relates to the electric energy instrument field, relate in particular to a kind of calibration steps and device of electric energy meter.
Background technology
The chip measuring accuracy of nowadays electric energy meter employing is more and more higher, the parameter that relates to is also more and more, and existing electric energy meter calibration steps mainly is to the calibration of a little typicalness parameters such as gain G AIN calibration, imbalance Offset calibration and phase place Phase calibration etc.These calibration stepss, all be some the typicalness parameter settings according to common computation chip, many other parameters do not relate to, there is the precision disappearance in existing method to the conversion of 16 system numbers of mixed decimal position in addition, bigger error, totally bring formula calculating metering result into and can produce skew, affect precision.In addition, the calibration process is complicated, also should have initialization and reset function in the inaccurate situation of calibration.
Therefore, how to guarantee that the electric energy meter front electric energy metrical that dispatches from the factory is accurate, improving the electric energy meter measuring accuracy is technical issues that need to address.
Summary of the invention
In view of this, the embodiment of the invention provides a kind of calibration steps and device of electric energy meter, and the viewing location that solves naked-eye stereoscopic display is fixed the problem of narrow viewing angle; The efficient that the manual alignment error of ammeter brings is not high, the problem that precision is not high.
For addressing the above problem, the technical scheme that the embodiment of the invention provides is as follows:
On the one hand, the invention provides a kind of calibration steps of electric energy meter, may further comprise the steps: calibration task parameters and calibration error threshold that described electric energy meter is set; Monitor the calibration information in the electric energy meter calibration process; Obtain the calibration error of electric energy meter according to calibration information; If the calibration error greater than the calibration error threshold, is then recalibrated electric energy meter; If the calibration error less than or equal to the calibration error threshold, is then finished the calibration process.
On the other hand, the invention provides the calibrating installation of electric energy meter, comprising: performance element, be used for carrying out the calibration of electric energy meter, and resetting and initialization before recalibrating; Monitoring unit is for the calibration information of monitoring described electric energy meter calibration process; Computing unit is used for the calibration error according to described calibration information acquisition electric energy meter, and the calibration error threshold of described electric energy meter is set, and recalibrates electric energy meter if described calibration error, then feeds back to described performance element greater than described calibration error threshold; If described calibration error less than or equal to described calibration error threshold, then feeds back to described performance element and finishes the calibration process.
Can find out, adopt calibration steps and the device of electric energy meter of the present invention, in the calibration process, some traditional calibration processes have been changed, optimize testing sequence, and adopted the multiprecision arithmetic of some errors of calculation, shortened the calibration time, improve the calibration precision, guaranteed the ammeter measurement accuracy.By monitoring the calibration process of electric energy meter, in time obtain the error in the calibration process, guaranteed the accuracy of calibration; In addition, after the calibration failure, by resetting and initialization, also protected electric energy meter.
Description of drawings
In order to be illustrated more clearly in the embodiment of the invention or technical scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use among the embodiment, apparently, accompanying drawing in the following describes only is some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the process flow diagram of the calibration steps of electric energy meter of the present invention;
Fig. 2 is the schematic diagram of the calibrating installation of electric energy meter of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the invention, the technical scheme in the embodiment of the invention is carried out clear, complete description, obviously, described embodiment only is the present invention's part embodiment, rather than whole embodiment.Based on the embodiment among the present invention, those of ordinary skills belong to the scope of protection of the invention not making the every other embodiment that obtains under the creative work prerequisite.
Be illustrated in figure 1 as the process flow diagram of the calibration steps of electric energy meter.Step S100 arranges the calibration error threshold of electric energy meter.Be specially: the basic parameter of voltmeter calibration is set, comprises phenotype, rated voltage, phase line, meter constant, calibration voltage, calibration electric current, noise current and broken phase current etc., and the calibration error threshold that these basic parameters allow is set.
Step S102, the calibration electric energy meter starts the electric energy meter calibration process.
Step S104 monitors the calibration information in the electric energy meter calibration process.Be specially: calibration protocol is set, the transmission byte comprises start bit, data bit, even parity bit and position of rest, wherein, every byte contains 8 binary codes, add totally 11 of start bits (0), even parity bit, a position of rest (1) during transmission, data bit is 8, passes first least significant bit (LSB) during transmission, the high-order significance bit of rear biography.According to the direction of transfer of transmission byte, the calibration information in the reading power meters calibration process.The baud rate of byte transmission is that 1200BPS-9600BPS is adjustable, and this communication baud rate refers to the baud rate of ammeter and extraneous communication.Interface can be that 485 interfaces also can be 232 interfaces and other interface, is specifically determined by ammeter hardware
Step S106 is according to the calibration error of calibration information acquisition electric energy meter.Be specially: calibrate item by item electric energy meter according to the calibration task parameters; According to calibration task parameters and calibration information, obtain item by item the calibration error of electric energy meter.
Step S108, whether contrast calibration error is greater than the calibration error threshold.
If the calibration error greater than the calibration error threshold, then resets and initialization to electric energy meter, return step S102, recalibrate electric energy meter;
If the calibration error less than or equal to the calibration error threshold, is then calibrated the parameter of electric energy meter, at step S110, finish the calibration process.The calibration process finishes, and electric energy meter reads pulsion phase automatically to single amount and other parameters.
The parameter of calibration electric energy meter comprises: the computing formula that the A phase voltage is adjusted coefficient is G2=2 ∧ 15[(I2 (1+G1/2 ∧ 15)/I1)-1], wherein, G2 is that the A phase voltage is adjusted coefficient, I1 is current A phase current effective value, G1 is that current A phase current is adjusted coefficient, I2 is the A phase current actual value of expectation, and G2 is that required A phase voltage is adjusted coefficient.Only need input the A phase current values of expectation when arranging with computer, computer will be adjusted coefficient value and expect that current value calculates G2 according to electric energy meter A phase current effective value, A phase current at that time, and G2 is that 2 bytes have symbol two's complement form.In the present embodiment, single-phase meter school A phase, three-phase meter school A phase and the C phase of phase three-wire three, the three-phase meter school A phase of three-phase and four-line, B phase and C phase, the computing formula of the voltage regulation factor of the computing formula of B phase and the voltage regulation factor of C phase and described A phase is identical in the described three-phase meter.
The computing formula of A phase main areas angular difference penalty coefficient is
Wherein,
Phase main areas angular difference penalty coefficient, err are the calibration error of electric energy meter,
Be current A phase main areas angular difference penalty coefficient.Only need input the error of reading on the current standard scale when arranging with computer, computer will according to current A phase main areas angular difference penalty coefficient, calculate
Be that 2 bytes have symbol two's complement form.In the present embodiment, single-phase meter school A phase, three-phase meter school A phase and the C phase of phase three-wire three, the three-phase meter school A phase of three-phase and four-line, B phase and C phase, the computing formula of the main areas angular difference penalty coefficient of the computing formula of B phase and the main areas angular difference penalty coefficient of C phase and described A phase is identical in the described three-phase meter.
Be illustrated in figure 2 as the schematic diagram of the calibrating installation of electric energy meter 2.The calibrating installation 1 of this electric energy meter comprises performance element 13, monitoring unit 11 and computing unit 12.
The calibration steps of electric energy meter of the present invention and device in the calibration process, have changed some traditional calibration processes, optimize testing sequence, and adopted the multiprecision arithmetic of some errors of calculation, shortened the calibration time, improve the calibration precision, guaranteed the ammeter measurement accuracy.By monitoring the calibration process of electric energy meter, in time obtain the error in the calibration process, guaranteed the accuracy of calibration; In addition, after the calibration failure, by resetting and initialization, also protected electric energy meter.
The professional can also further should be able to recognize, unit and the algorithm steps of each example of describing in conjunction with embodiment disclosed herein, can realize with electronic hardware, computer software or the combination of the two, for the interchangeability of hardware and software clearly is described, composition and the step of each example described in general manner according to function in the above description.These functions are carried out with hardware or software mode actually, depend on application-specific and the design constraint of technical scheme.The professional and technical personnel can specifically should be used for realizing described function with distinct methods to each, but this realization should not thought the scope that exceeds the embodiment of the invention.
The method of describing in conjunction with embodiment disclosed herein or the step of algorithm can directly use the software module of hardware, processor execution, and perhaps the combination of the two is implemented.
To the above-mentioned explanation of the disclosed embodiments, make this area professional and technical personnel can realize or use the embodiment of the invention.Multiple modification to these embodiment will be apparent concerning those skilled in the art, and General Principle as defined herein can in the situation of the spirit or scope that do not break away from the embodiment of the invention, realize in other embodiments.Therefore, the embodiment of the invention will can not be restricted to these embodiment shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
It below only is the preferred embodiment of the embodiment of the invention; not in order to limit the embodiment of the invention; all within the spirit and principle of the embodiment of the invention, any modification of doing, be equal to replacement, improvement etc., all should be included within the protection domain of the embodiment of the invention.
Claims (10)
1. the calibration steps of an electric energy meter is characterized in that, may further comprise the steps:
Calibration task parameters and the calibration error threshold of described electric energy meter are set;
Monitor the calibration information in the described electric energy meter calibration process;
Obtain the calibration error of electric energy meter according to described calibration information;
If described calibration error then resets and initialization to electric energy meter greater than described calibration error threshold, recalibrate electric energy meter;
If described calibration error is less than or equal to described calibration error threshold, the parameter of then calibrating described electric energy meter is finished the calibration process.
2. the calibration steps of electric energy meter according to claim 1 is characterized in that, the calibration information in the described electric energy meter calibration process of described monitoring comprises:
Calibration protocol is set, and the transmission byte comprises start bit, data bit, even parity bit and position of rest;
According to the direction of transfer of described transmission byte, read the calibration information in the described electric energy meter calibration process.
3. the calibration steps of electric energy meter according to claim 1 is characterized in that, described calibration error according to described calibration information acquisition electric energy meter comprises:
Calibrate item by item described electric energy meter according to described calibration task parameters;
According to described calibration task parameters and described calibration information, obtain item by item the calibration error of described electric energy meter.
4. electric energy meter calibration steps according to claim 1, it is characterized in that, the parameter of the described electric energy meter of described calibration comprises: the computing formula that the A phase voltage is adjusted coefficient is G2=2 ∧ 15[(I2 (1+G1/2 ∧ 15)/I1)-1], wherein, G2 is that the A phase voltage is adjusted coefficient, and I1 is current A phase current effective value, and G1 is that current A phase current is adjusted coefficient, I2 is the A phase current actual value of expectation, and G2 is that required A phase voltage is adjusted coefficient; Wherein, single-phase meter school A phase, three-phase meter school A phase and the C phase of phase three-wire three, the three-phase meter school A phase of three-phase and four-line, B phase and C phase, the computing formula of the voltage regulation factor of the computing formula of B phase and the voltage regulation factor of C phase and described A phase is identical in the described three-phase meter.
5. electric energy meter calibration steps according to claim 1, it is characterized in that, the parameter of the described electric energy meter of described calibration comprises: the computing formula of A phase main areas angular difference penalty coefficient is φ 2=φ 1+ (err/1.732/0.017578), wherein, φ 2 is A phase main areas angular difference penalty coefficient, err is the calibration error of electric energy meter, and φ 1 is current A phase main areas angular difference penalty coefficient; Single-phase meter school A phase, three-phase meter school A phase and the C phase of phase three-wire three, the three-phase meter school A phase of three-phase and four-line, B phase and C phase, the computing formula of the main areas angular difference penalty coefficient of the computing formula of B phase and the main areas angular difference penalty coefficient of C phase and described A phase is identical in the described three-phase meter.
6. the calibrating installation of an electric energy meter is characterized in that, comprising:
Performance element is used for carrying out the calibration of electric energy meter according to the ammeter precision that sets in advance and error threshold, and recalibrates front resetting and initialization;
Monitoring unit, the calibration information for monitoring described electric energy meter calibration process reads standard scale error originated from input data, if error transfinites, will feed back to performance element and process;
Computing unit is used for the calibration error according to described calibration information acquisition electric energy meter, and the calibration error threshold of described electric energy meter is set, and recalibrates electric energy meter if described calibration error, then feeds back to described performance element greater than described calibration error threshold; If described calibration error less than or equal to described calibration error threshold, then feeds back to described performance element and finishes the calibration process.
7. the calibrating installation of electric energy meter according to claim 6 is characterized in that, described monitoring unit is the audiomonitor by program start.
8. the calibrating installation of electric energy meter according to claim 6 is characterized in that:
Described performance element specifically is used for the calibration byte is set, and described calibration byte comprises start bit, data, even parity bit and position of rest;
Described monitoring unit specifically is used for the direction of transfer according to described calibration byte, reads calibration information and correlated error information in the described electric energy meter calibration process.
9. the calibrating installation of electric energy meter according to claim 6 is characterized in that:
Described performance element specifically is used for arranging described electric energy meter calibrating task parameters;
Described computing unit specifically is used for carrying out item by item at described performance element the calibration process of described electric energy meter, according to described calibration task parameters and described calibration information, obtains item by item the calibration error of described electric energy meter.
10. the calibrating installation of electric energy meter according to claim 9 is characterized in that, described performance element specifically is used for revising the electric energy meter calibrating task parameters when changing the electric energy meter type.
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| CN103278794A (en) * | 2013-05-23 | 2013-09-04 | 广州供电局有限公司 | Intelligent centralized control method, device and system of electric energy meter on-site calibration instrument |
| CN103487782A (en) * | 2013-07-16 | 2014-01-01 | 深圳市航天泰瑞捷电子有限公司 | Electric meter calibrating method and automatic calibrating system |
| CN103558579A (en) * | 2013-11-06 | 2014-02-05 | 国网安徽省电力公司淮南供电公司 | Electric energy meter calibration device |
| CN104466591A (en) * | 2014-11-26 | 2015-03-25 | 上海斐讯数据通信技术有限公司 | Calibration method and device for intelligent outlet |
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