Transformer calibrator verification method and system based on Kaiser window FFT filtering

Abstract

The invention provides a transformer calibrator verification method and a transformer calibrator verification system based on Kaiser window FFT filtering. The transformer calibrator verification method and the transformer calibrator verification system adopt automatic verification software of an upper computer and mainly achieve the functions of automatically verifying a transformer calibrator according to national metrological verification regulations, automatically recording test data, being capable of printing all records and a verification certificate required by the regulations, calculating a ratio difference value and an angular difference value according to a set measuring point output signal, and comparing calculation results, thereby ensuring the verification precision and verification efficiency; a Kaiser window FFT filtering algorithm is adopted for extracting fundamental waves, a main influencing factor for extracting differential value signal fundamental wave components ischannel leakage caused by frequency fluctuations, and leakage is reduced by increasing data sampling points, namely, reducing the width of a main lobe of a rectangular window; and since the filteringalgorithm based on fundamental wave has good adaptability to frequency fluctuations, real-time tracking of frequency can be realized, and the precision of fundamental wave extraction can be greatly improved.

Description

technical field [0001] The present application relates to the technical field of verification of a transformer calibrator, in particular to a method and system for calibrating a transformer calibrator based on Kaiser window FFT filtering. Background technique [0002] Metering devices in modern power systems are constantly improving, and the verification of these modern metering devices has become more stringent. For the verification work of the transformer calibrator in the metering system, there are mainly the following two problems: on the one hand, the efficiency of the traditional manual verification can no longer meet the requirements of modern equipment verification, and the testing personnel begin to be unable to do what they want; on the other hand, the existing Standard metrological traceability devices and metrological traceability technologies can no longer meet and meet the verification needs of modern measuring instruments and equipment. Therefore, the verific...

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Problems solved by technology

[0005] This application provides a method and system for calibrating a transformer calibrator based on Kaiser window FFT filtering to solve the problem of manual verification by using the complete inspection device of a transformer calibrator in the prior art, resulting in inaccurate verification results. Accurate, and in the output signal of the signal source of the whole inspection device of the transformer calibrator and the extraction of the fundamental component of the signal, the technical problems of frequency fluctuation and DC offset contained in the signal are ignored

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