Fast calibration method of single-phase electric energy meter

Abstract

The invention relates to a fast calibration method of a single-phase electric energy meter. According to the fast calibration method, the gain initial value of a power gain correction register of a metering chip of a calibrated meter is preset so as to be fast positioned to a target error value, only a 100%Ib-point 0.5-induction error point is debugged; apparent power deviation and active power deviation are simultaneously obtained at the error point; 100%Ib-point 1.0-resistance gain correction is performed through utilizing the apparent power deviation; 100%Ib-point 0.5-induction phase correction is performed through utilizing the active power deviation; and a 100%Ib-point 0.5-induction error value which has been obtained through calculation is directly utilized to perform 5%Ib-point 1.0-resistance small signal correction, and therefore, too long debugging time of small signals can be avoided. The fast calibration method has the advantages of fast error target value positioning, high meter calibration efficiency and significantly-improved accuracy.

Description

technical field [0001] The invention relates to the technical field of electric energy metering, in particular to a fast meter calibration method for a single-phase electric energy meter. Background technique [0002] All electric energy meters need to undergo error calibration before they can be formally connected to the grid for measurement. Therefore, for manufacturers of mass-produced electric meters, meter adjustment takes a large part of the time, and the accuracy of meter adjustment also directly affects the quality of meters. . [0003] The current conventional single-phase meter calibration process is as follows: [0004] (1) The host computer controls the program-controlled power source to provide 100% rated voltage Un and 100% calibration current Ib to the meter to be calibrated and the standard meter at the same time, and the power factor PF=1.0. After the meter output error value, the host computer reads back Calculate the error value and calculate the gain va...

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Problems solved by technology

[0009] 2. The above meter calibration process needs to wait for the error value of the meter calibration station to be stable before outputting the error value before writing the calculated value into the metering chip to be calibrated, and the next debugging step can only be performed after the next error readback is correct. The process takes a long time

[0010] 3. Since the frequency of the pulse signal output by the electric energy meter is proportional to the size of the measured power, under the action of the small signal current in step (3), the measured power is very small and the pulse speed is very slow, so that the step (3) The pulse measurement process is very long, and in the case where the user has high requirements for accuracy, for example, when it is necessary to pass the test of 2% Ib point resistance 1.0, the waiting time will be longer. Weak, very susceptible to interference from the surrounding environment, resulting in inaccurate calibration results; currently, although there is a problem of slow pulses for small signal current debugging in step (3), directly read the power register value of the metering chip to be calibrated method, but at least 20 times of reading and averaging are required, the efficiency is still low, and the stability of the small current power value is poor, and there are errors caused by the jump of the table body, resulting in low calibration accuracy

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