Relevance extension Hibert phase-shifting electronic transformer calibrator traceability method and correlation extension Hibert phase-shifting electronic transformer calibrator traceability system

Abstract

The invention relates to a correlation extension Hibert phase shift electronic transformer calibrator traceability method and system, and the method comprises the steps: outputting two paths of identical analog signals and comparison signals through standard power source voltage, and outputting the analog signals to an analog input port of an electronic transformer calibrator; the comparison signal is subjected to standard A / D and protocol conversion to form a digital standard signal, and the digital standard signal is sent to a digital input port; carrying out time sequence weighting correlation degree waveform matching endpoint continuation on a digital sampling signal obtained after standard A / D sampling on the comparison signal, adding a Nuttall window to continuation data, and further carrying out Hilbert transform phase shift to determine a phase differential; and determining the measurement error of the electronic transformer calibrator based on the differential signal and the indication error of the electronic transformer calibrator. On the premise of Hilbert transform phase shift and on the basis of the characteristics of a signal source, a method for combining time sequence weighted correlation degree waveform matching endpoint continuation and a Nuttall window function is provided, the endpoint effect is overcome, and therefore the adding precision of the phase differential is improved.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of traceability testing of electronic transformer calibrator, in particular to a method and system for tracing the origin of electronic transformer calibrator by extension of correlation degree and Hibert phase-shifting. Background technique [0002] Electronic transformer is a new demand brought forward by the development of digitalization, networking and intelligence of the power grid. It has superior sensing performance and insulation performance, and is widely used in smart substations. As an important equipment in the measurement assurance system, its traceability system directly Affect operational reliability and measurement accuracy. [0003] At present, the traceability method of the electronic transformer calibrator is based on the traceability method of the traditional transformer calibrator, both of which use the principle of differential measurement, but the working prin...

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Problems solved by technology

The micro-difference method has become mature in the traceability of the traditional transformer calibrator, and has met the requirements through the evaluation of uncertainty. However, there are few studies on the traceability of the electronic transformer calibrator with the micro-difference method. It is proposed to continue to use the traditional transformer calibrator verification device, combined with the 3458A digital multimeter and clock synchronization device, and use the analog differential method to measure the difference to trace the source of the electronic transformer calibrator

However, the hardware of the analog differential method is complex, susceptible to time drift and temperature drift, and its stability is poor, which leads to the problem of large uncertainty introduced by the traceability method and unreliable traceability results

The document "Design of Quantitative Source Traceability Scheme for Electronic Transformer Calibrator Overall Inspection Device" (Lei Ming, Guo Diao, Yan Lieqi, etc. for electronic technology) proposes a method for digital differential source traceability, but does not add any traceability to the differential In-depth research on specific methods and characteristics, and no feasible method to improve the accuracy of differential addition, so the traceability of this method is not perfect enough

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