High-precision electrical parameter analyzer

Abstract

The invention relates to a high-precision electrical parameter analyzer, more particularly to an electrical parameter analyzer that is applied to a test / an analysis of an alternating current parameter, calibration on electric energy quality analytical equipment and a scientific research test. The analyzer comprises an analog signal sampler, a three-phase input automatic control circuit, a front end drive circuit, an A / D sampling circuit, an operation control circuit, a display and a host computer. A three-phase detected voltage, a current signal are respectively pass through the analog signal sampler and are input into the three-phase input automatic control circuit; a signal is output by the three-phase input automatic control circuit as well as pass through the front end drive circuit and is transmitted to the A / D sampling circuit; a digital signal is output by the A / D sampling circuit and pass though the operation control circuit; and then, the digital signal is accessed to the display and is displayed by the host computer. According to the invention, various measuring functions can be realized; multiple testing and analyzing functions are realized; the electrical parameter measurement precision is high; harmonic wave analysis precision is high; displayed data are complete; and the analyzer can be operated conveniently.

Description

technical field [0001] The invention relates to an electric parameter analyzer used in alternating current parameter test / analysis, power quality analysis device verification and scientific research test. Background technique [0002] The measurement of AC parameters includes not only the measurement of conventional electrical quantities such as voltage, current, power, and electric energy, but also the analysis of power quality such as harmonic analysis. The measurement of the above-mentioned electrical quantities is very important in various industries, so Accurate measurement of these quantities is critical. [0003] Some domestic instrument manufacturers also have some good multi-functional standard meter products, whose functions and performance cannot meet the requirements of IEC or national standards for multi-functional analytical instruments, and other low-end power quality analysis instruments mostly use ordinary FFT or DFT algorithms. Harmonic analysis and analys...

AI Technical Summary

Problems solved by technology

[0003] Some domestic instrument manufacturers also have some good multi-functional standard meter products, whose functions and performance cannot meet the requirements of IEC or national standards for multi-functional analytical instruments, and other low-end power quality analysis instruments mostly use ordinary FFT or DFT algorithms. Harmonic analysis and analysis, some analyzers use phase-locked loops to achieve frequency tracking close to quasi-synchronous sampling, but the tracking effect has a greater impact on the measured signal, and the analysis accuracy can only meet the needs of ordinary work meters, and cannot be used as a standard, nor can it It meets the needs of enterprise, provincial and municipal metering institutions for value transmission, and can only be used for operation inspection and qualitative analysis. Therefore, in terms of electrical parameter analysis, high-precision analytical instruments are still relatively rare in actual engineering applications, and most domestic enterprises still use foreign instruments. Products from some well-known manufacturers

Foreign countries have great advantages in the development of analytical instruments compared with domestic ones, and their technical level is much ahead of domestic ones. However, although foreign instruments have better performance, they are also very expensive, and after-sales maintenance is very inconvenient and maintenance costs are high. Therefore, the development of A multifunctional electrical parameter analyzer with high accuracy and cost control is very necessary

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