Electric energy meter self-calibration method based on chip built-in RC oscillator

Abstract

The invention belongs to the technical field of electric energy meter calibration, particularly relates to an electric energy meter self-calibration method based on a chip built-in RC oscillator. Theprovided electric energy meter self-calibration method aims to solve the problem that precise self-calibration cannot be achieved, and comprises the steps of: S1, testing a chip to obtain a deviationproportion value; S2, installing the chip in an electric energy meter; S3, placing the electric energy meter on a calibration table; S4, providing high-precision standard rated power by the calibration table, and comparing the pulse interval time of the standard rated power with the pulse interval time of the current power; S5, multiplying an error value by the deviation proportion value to obtainan actual power pulse error value; S6, dividing an actual power value by the actual power pulse error value to obtain rated power of which the current power is standard; S7, displaying a power errorproportion value on an error device; and S8, checking the reading of the error device, and verifying whether self-calibration is successful or not. According to the electric energy meter self-calibration method, the problems of frequency deviation and discreteness of the RC oscillator in the chip are solved, and precise self-calibration can be realized.

Description

technical field [0001] The invention relates to the technical field of electric energy meter calibration, in particular to a self-calibration method of an electric energy meter based on a chip built-in RC oscillator. Background technique [0002] Electric energy meter is an instrument used to measure electric energy, also known as watt-hour meter, fire meter, kilowatt-hour meter, and refers to an instrument that measures various electrical quantities. When using the electric energy meter, it should be noted that in the case of low voltage (not more than 500 volts) and small current (tens of amps), the electric energy meter can be directly connected to the circuit for measurement; in the case of high voltage or large current, the electric energy meter It cannot be directly connected to the line, and it needs to be used with a voltage transformer or a current transformer. Electric energy meters can be divided into DC electric energy meters and AC electric energy meters accord...

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Problems solved by technology

[0003] The electric energy meter needs to be calibrated before production. Most of the existing single-phase or three-phase ordinary electric energy meters are calibrated by the electric energy meter calibration table to provide accurate rated power. The standard power meter sends standard power pulses. Each calibration table The error device of the meter position compares the pulse of the standard meter with the pulse of the electric energy meter of the meter position, and calculates the pulse interval error. The error is reduced to within the specified range, and the self-calibration of the energy meter cannot be realized; the calibration part of the existing single-phase or three-phase ordinary energy meter adopts the method of integrating the RC oscillator in the chip to realize the self-calibration of the energy meter, but the RC integrated in the chip Oscillators have frequency deviation and discrete problems, which cannot realize accurate self-calibration of energy meters

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