CN102928812B - The calibration steps of electric energy meter and device - Google Patents
The calibration steps of electric energy meter and device Download PDFInfo
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Abstract
The invention discloses a kind of calibration steps of electric energy meter, comprise the following steps: calibration task parameters and calibration error threshold that described electric energy meter is set; Monitor the calibration information in electric energy meter calibration process; The calibration error of electric energy meter is obtained according to calibration information; If calibration error is greater than calibration error threshold, then recalibrate electric energy meter; If calibration error is less than or equal to calibration error threshold, then complete calibration process.The invention also discloses a kind of calibrating installation of electric energy meter.The calibration steps of electric energy meter disclosed in this invention and device, by monitoring calibration process, the error occurred in Timeliness coverage calibration process, achieves the accurate calibration of electric energy meter.
Description
Technical Field
The invention relates to the field of electric energy instruments, in particular to a method and a device for calibrating an electric energy meter.
Background
Nowadays, the electric energy meter adopts increasingly high chip metering accuracy and increasingly more parameters are involved, and the existing electric energy meter calibration method mainly calibrates some typical parameters such as: GAIN calibration, Offset calibration, and Phase calibration, etc. The calibration methods are all set according to some typical parameters of a common metering chip, many other parameters are not involved, and in addition, the existing method has the defects of precision loss and large error in the conversion of 16-system numbers with decimal places, and the metering result calculated by a general substitution formula can generate offset to influence the precision. In addition, the calibration process is complex, and the calibration device also has the functions of initialization and reset under the condition of inaccurate calibration.
Therefore, how to ensure accurate electric energy metering before the electric energy meter leaves the factory and improve the metering precision of the electric energy meter is a technical problem to be solved.
Disclosure of Invention
In view of this, embodiments of the present invention provide a calibration method and apparatus for an electric energy meter, which solve the problems of fixed viewing position and narrow viewing angle of a naked eye stereoscopic display; the efficiency that manual adjustment error of ammeter brought is not high, the not high problem of precision.
In order to solve the above problems, the technical solutions provided by the embodiments of the present invention are as follows:
in one aspect, the invention provides a calibration method for an electric energy meter, which 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; obtaining a calibration error of the electric energy meter according to the calibration information; if the meter calibration error is larger than the meter calibration error threshold, recalibrating the electric energy meter; and if the meter calibration error is less than or equal to the meter calibration error threshold, completing the meter calibration process.
In another aspect, the present invention provides a calibration apparatus for an electric energy meter, including: the execution unit is used for executing calibration of the electric energy meter and resetting and initialization before recalibration; the monitoring unit is used for monitoring calibration information in the calibration process of the electric energy meter; the calculation unit is used for obtaining a meter calibration error of the electric energy meter according to the calibration information, setting a meter calibration error threshold of the electric energy meter, and feeding back the meter calibration error to the execution unit to recalibrate the electric energy meter if the meter calibration error is larger than the meter calibration error threshold; and if the meter calibration error is less than or equal to the meter calibration error threshold, feeding back to the execution unit to finish the meter calibration process.
The calibration method and the calibration device for the electric energy meter change some traditional meter calibration processes in the meter calibration process, optimize the test sequence, adopt some high-precision algorithms for calculating errors, shorten the meter calibration time, improve the meter calibration precision and ensure the metering accuracy of the electric energy meter. By monitoring the calibration process of the electric energy meter, the error in the meter calibration process is obtained in time, and the meter calibration accuracy is ensured; in addition, after the meter calibration fails, the electric energy meter is protected through resetting and initialization.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a flow chart of a method of calibrating an electric energy meter according to the present invention;
fig. 2 is a schematic diagram of a calibration device of the electric energy meter of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Fig. 1 is a flowchart of a calibration method of an electric energy meter. And S100, setting a meter calibration error threshold of the electric energy meter. The method specifically comprises the following steps: setting basic parameters of voltmeter calibration, including phenotype, rated voltage, phase line, pulse constant, meter calibration voltage, meter calibration current, noise current, open-phase current and the like, and setting meter calibration error thresholds allowed by the basic parameters.
And S102, calibrating the electric energy meter and starting the electric energy meter calibration process.
And step S104, monitoring calibration information in the calibration process of the electric energy meter. The method specifically comprises the following steps: setting a calibration protocol, wherein a transmission byte comprises an initial bit, a data bit, an even check bit and a stop bit, each byte comprises 8-bit binary codes, 11 bits including the initial bit (0), the even check bit and the stop bit (1) are added during transmission, the data bit is 8 bits, the least significant bit is transmitted first during transmission, and the more significant bit is transmitted later. And reading calibration information in the calibration process of the electric energy meter according to the transmission direction of the transmission bytes. The baud rate of byte transmission is 1200BPS-9600BPS, and the communication baud rate refers to the baud rate of communication between the electric meter and the outside. The interface can be 485 interface or 232 interface and other interfaces, which are determined by the hardware of the electric meter
And step S106, obtaining a calibration error of the electric energy meter according to the calibration information. The method specifically comprises the following steps: calibrating the electric energy meter item by item according to the meter calibration task parameters; and acquiring meter calibration errors of the electric energy meter item by item according to the meter calibration task parameters and the calibration information.
And step S108, comparing whether the meter calibration error is larger than a meter calibration error threshold.
If the meter calibration error is larger than the meter calibration error threshold, resetting and initializing the electric energy meter, returning to the step S102, and recalibrating the electric energy meter;
and if the meter calibration error is less than or equal to the meter calibration error threshold, calibrating the parameters of the electric energy meter, and completing the meter calibration process in step S110. And (5) finishing the meter calibration process, and automatically reading the pulse relative unit quantity and other parameters by the electric energy meter.
Calibrating parameters of the electric energy meter includes: the formula for calculating the a-phase voltage adjustment coefficient is G2 ═ 2 Λ 15[ (I2(1+ G1/2 Λ 15)/I1) -1], where G2 is the a-phase voltage adjustment coefficient, I1 is the effective value of the current a-phase current, G1 is the current a-phase current adjustment coefficient, I2 is the actual value of the desired a-phase current, and G2 is the calculated a-phase voltage adjustment coefficient. When the computer is used for setting, only the expected A-phase current value needs to be input, the computer calculates G2 according to the effective value of the current A-phase current, the value of the A-phase current adjustment coefficient and the expected current value of the electric energy meter, and G2 is in a 2-byte signed binary complement form. In the present embodiment, the single-phase table corrects the a phase, the three-phase table corrects the a phase and the C phase for the three-phase three-wire, and the three-phase table corrects the a phase, the B phase and the C phase for the three-phase four-wire, and the formula for calculating the voltage adjustment coefficients of the B phase and the C phase in the three-phase table is the same as the formula for calculating the voltage adjustment coefficients of the a phase.
The calculation formula of the A-phase main area angular difference compensation coefficient is Wherein,the phase main area angular difference compensation coefficient, err is the calibration error of the electric energy meter,and compensating the coefficient for the angular difference of the main area of the current phase A. When the computer is used for setting, only the error read out from the current standard table needs to be input, and the computer calculates the compensation coefficient of the angular difference of the main area of the current A phase according to the angular difference of the current A phaseIn the 2-byte signed two's complement form. In the present embodiment, the single-phase table corrects the a phase, the three-phase table corrects the a phase and the C phase for the three-phase three-wire, and the three-phase table corrects the a phase, the B phase and the C phase for the three-phase four-wire, and the calculation formula of the main area angular difference compensation coefficient of the B phase and the C phase in the three-phase table is the same as the calculation formula of the main area angular difference compensation coefficient of the a phase.
Fig. 2 is a schematic diagram of a calibration device of the electric energy meter 2. The calibration device 1 of the electric energy meter comprises an execution unit 13, a monitoring unit 11 and a calculation unit 12.
And the execution unit 13 is used for executing calibration of the electric energy meter according to preset electric meter precision and an error threshold, executing calibration of the electric energy meter 2 through resetting and initialization before recalibration, and resetting and initialization before recalibration. The method is particularly used for setting a calibration protocol, and setting transmission bytes comprising 11 bits including a start bit, a data bit, an even check bit and a stop bit, wherein the data bit is 8 bits, and the least significant bit is transmitted first and the higher significant bit is transmitted later during transmission. The method is also used for setting the electric energy meter calibration task parameters and modifying the electric energy meter calibration task parameters when the type 2 of the electric energy meter is replaced.
And the monitoring unit 11 is used for monitoring calibration information in the calibration process of the electric energy meter 2. The listening unit 11 is a monitor started by a program, and is specifically configured to read calibration information in the calibration process of the electric energy meter 2 according to the transmission direction of the calibration byte. In addition, the monitoring unit 11 can also directly read the input error data of the standard table, and if the error exceeds the limit, the data is fed back to the execution unit for processing
The calculating unit 12 is configured to obtain a meter calibration error of the electric energy meter according to the calibration information, set a meter calibration error threshold of the electric energy meter, and feed back the meter calibration error to the executing unit 13 to recalibrate the electric energy meter 2 if the meter calibration error is greater than the meter calibration error threshold; if the meter calibration error is less than or equal to the meter calibration error threshold, the data is fed back to the execution unit 13 to complete the meter calibration process. The calculating unit 12 is further configured to, in the process that the executing unit 13 executes the calibration of the electric energy meter 2 item by item, obtain a meter calibration error of the electric energy meter item by item according to the meter calibration task parameter and the calibration information.
According to the calibration method and device for the electric energy meter, in the meter calibration process, some traditional meter calibration processes are changed, the test sequence is optimized, some high-precision algorithms for calculating errors are adopted, the meter calibration time is shortened, the meter calibration precision is improved, and the metering accuracy of the electric energy meter is ensured. By monitoring the calibration process of the electric energy meter, the error in the meter calibration process is obtained in time, and the meter calibration accuracy is ensured; in addition, after the meter calibration fails, the electric energy meter is protected through resetting and initialization.
Those of skill would further appreciate that the various illustrative components and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present embodiments.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present embodiments. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention shall be included in the scope of the present invention.
Claims (8)
1. A calibration method of an electric energy meter is characterized by comprising 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, including: setting a calibration protocol, wherein a transmission byte comprises a start bit, a data bit, an even check bit and a stop bit; reading calibration information in the electric energy meter calibration process according to the transmission direction of the transmission bytes;
obtaining a calibration error of the electric energy meter according to the calibration information;
if the meter calibration error is larger than the meter calibration error threshold, resetting and initializing the electric energy meter, and recalibrating the electric energy meter;
and if the meter calibration error is less than or equal to the meter calibration error threshold, calibrating the parameters of the electric energy meter, and completing the meter calibration process.
2. The method for calibrating an electric energy meter according to claim 1, wherein the obtaining a calibration error of the electric energy meter according to the calibration information comprises:
calibrating the electric energy meter item by item according to the meter calibration task parameters;
and acquiring meter calibration errors of the electric energy meter item by item according to the meter calibration task parameters and the calibration information.
3. The method of claim 1, wherein calibrating the parameters of the power meter comprises: the calculation formula of the A phase voltage adjustment coefficient is G2 = 2^15[ (I2(1+ G1/2^15)/I1) -1], wherein G2 is the A phase voltage adjustment coefficient, I1 is the effective value of the current A phase current, G1 is the current A phase current adjustment coefficient, I2 is the actual value of the expected A phase current, and G2 is the solved A phase voltage adjustment coefficient; the calculation formula of the voltage adjustment coefficients of the phase B and the phase C in the three-phase table is the same as that of the voltage adjustment coefficient of the phase A.
4. The method of claim 1, wherein calibrating the parameters of the power meter comprises: the calculation formula of the A-phase main area angular difference compensation coefficient is phi 2 = phi 1+ (err/1.732/0.017578), wherein phi 2 is the A-phase main area angular difference compensation coefficient, err is a calibration error of the electric energy meter, and phi 1 is the current A-phase main area angular difference compensation coefficient; the method comprises the steps that A phases are calibrated through a single-phase meter, three-phase meters of three-phase three lines are used for calibrating A phases and C phases, three-phase meters of three-phase four lines are used for calibrating A phases, B phases and C phases, and a calculation formula of main area angular difference compensation coefficients of the B phases and the C phases in the three-phase meters is the same as that of the main area angular difference compensation coefficients of the A phases.
5. A calibration device for an electric energy meter, comprising:
the execution unit is used for executing calibration of the electric energy meter according to preset electric meter precision and an error threshold, setting meter calibration task parameters of the electric energy meter, and resetting and initializing before recalibration;
the monitoring unit is used for monitoring calibration information in the electric energy meter calibration process, reading input error data of the standard meter, and feeding back the input error data to the execution unit for processing if the error exceeds the limit;
the calculation unit is used for acquiring meter calibration errors of the electric energy meter item by item according to the meter calibration task parameters and the calibration information in the calibration process of the electric energy meter item by the execution unit, setting a meter calibration error threshold of the electric energy meter, and feeding back the electric energy meter to the execution unit for recalibrating the electric energy meter if the meter calibration errors are larger than the meter calibration error threshold; and if the meter calibration error is less than or equal to the meter calibration error threshold, feeding back to the execution unit to finish the meter calibration process.
6. The calibration device of the electric energy meter according to claim 5, wherein the monitoring unit is a monitor started by a program.
7. Calibration device for electric energy meters according to claim 5, characterized in that:
the execution unit is specifically configured to set a calibration byte, where the calibration byte includes a start bit, data, an even parity bit, and a stop bit;
the monitoring unit is specifically configured to read calibration information and related error information in the calibration process of the electric energy meter according to the transmission direction of the calibration bytes.
8. The calibration device of the electric energy meter according to claim 5, wherein the execution unit is specifically configured to modify the calibration task parameters of the electric energy meter when the type of the electric energy meter is replaced.
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