The properties of the method of frequency errors correction of input circuits within the range of nonlinear operation

Furmankiewicz, Leszek

doi:10.1109/isncc.2010.5524513

Cited by 1 publication

(3 citation statements)

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“…The correction efficiency depends inter alia on the accurateness of determination of the characteristics of the input stage errors. The results of the research presented in papers [4,5] show, that within the range of non-linear current transformer operation, on the effectiveness of frequency error correction, when measuring RMS value of current and power, determines the effectiveness of errors correction of the fundamental harmonic. This is due to the decisive participation of the fundamental harmonic in power systems.…”

Section: Input Stagesmentioning

confidence: 99%

“…7 and 8 results do not take into account higher harmonics appearing in the secondary current of the current transformer. The influence of higher harmonics on the effectiveness of frequency errors correction of current transformer within the range of non-linear operation was shown in papers [4,5].…”

Section: Input Stagesmentioning

confidence: 99%

“…Very high efficiency of the method was shown with the measurement of the non-sinusoidal power with the use of the transformer input stages applied in the industrial measurement instruments, in the linear range of their operation [3]. Papers [4,5] present the findings of the research which show the efficiency of the method of frequency error correction within the range of the nonlinear operation of the current transformer. The findings of the research prove the reduction of the correction efficiency when the measured signal is included in the range of the non-linear characteristics of the transformer conversion, but they do not disqualify this correction method under such circumstances.…”

Section: Introductionmentioning

confidence: 99%

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Improvement the efficiency of frequency errors correction of current transformer within the range of non-linear operation

Furmankiewicz

2013

International School on Nonsinusoidal Currents and Compensation 2013 (ISNCC 2013)

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The paper concerns the method of the correction of dynamic magnitude and phase errors of input stages, elaborated for linear input stages and tested for measurement current transformers. The method is implemented in the spectral domain in a programmed manner using the FFT algorithm. Correction of signal spectrum is based on frequency characteristics of magnitude and phase errors of input stages, which are determined on the basis of previous measurements. The method may be used for measuring RMS value and power of signals. It is possible to apply the correction method in the non-linear operation of the input stage, however, the correction efficiency may then be reduced. In order to improve the correction efficiency within the range of non-linear operation of the input stage, frequency errors of the a current transformer were identified with poly-harmonic signals. This paper presents the findings of the research of correction of frequency errors of a current transformer with poly-harmonic signals in measurements of the RMS current and power. The applied identification method brought improved efficiency of the correction within the range of non-linear operation of the current transformer.

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Section: Input Stagesmentioning

confidence: 99%

Section: Input Stagesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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