High-precision three-phase power meter and metering method thereof

Abstract

The invention relates to a high-precision three-phase power meter and a metering method thereof. The high-precision three-phase power meter comprises a three phase voltage input circuits, a three phase current input circuits, an optical coupling isolation circuit, a serial-parallel data conversion circuit, a micro-processing unit, a sampling time sequence control circuit connected with the micro-processing unit, a keyboard unit and a display unit, wherein the three phase voltage input circuits and the three phase current input circuits are respectively connected with the micro-processing unit through the optical coupling isolation circuit and the serial-parallel data conversion circuit. Each phase of the voltage input circuits comprises current input terminals, an active compensation transformer, a stored program control transmittal circuit and an analog-digital (AD) conversion circuit. The current input terminals, the active compensation transformer, the stored program control transmittal circuit and the AD conversion circuit are sequentially connected, the sampling time sequence control circuit is connected with the AD conversion circuit, and the stored program control transmittal circuit is connected with the micro-processing unit. A point by point processing method is used as the metering method to simplify a main loop module. The high-precision three-phase power meter and the metering method thereof is high in sampling point number, strong in real-time measurement ability, little in interference, good linearity and stability in current sampling, and thus measuring precision is greatly improved.

Description

technical field [0001] The invention relates to a three-phase electric energy meter, in particular to a high-precision three-phase electric energy meter with high sampling points, strong real-time measurement performance and high measurement accuracy and a measurement method thereof. Background technique [0002] At present, the accuracy of the three-phase electric energy meters used in China is below 0.02, and the accuracy is not very high. At present, the current transformer used in the three-phase electric energy meter is a passive compensation transformer, and the stability and linearity of current sampling are not good enough; Poor, this is determined by the way the sampling is calculated. The sampling calculation method of the traditional three-phase electric energy meter is as follows: the sampling timing pulse is generated according to the captured frequency and the number of sampling points; according to the sampling timing, the sampling point data of the six signa...

AI Technical Summary

Problems solved by technology

[0004] The invention mainly solves the technical problems that the original three-phase electric energy meter has insufficient sampling points, relatively poor real-time measurement performance, and insufficient measurement accuracy; it provides a high-precision three-phase electric energy meter and its measurement method, which has high sampling points and real-time measurement Strong, high measurement accuracy, the accuracy can reach within 0.01%

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