Development of a compensation algorithm for a measurement current transformer

Kang, Yong-Cheol; Zheng, Taiying; Kim, Y.-H.; Lee, B.-E.; So, S. H.; Crossley, P.A.

doi:10.1049/iet-gtd.2010.0174

Cited by 12 publications

(6 citation statements)

References 10 publications

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“…Some techniques to improve performance of VTs and CTs are present in scientific literature. Some of them, [29]- [31], are based on additional analog hardware, whereas some others, [32]- [33], are based on digital signal processing. On the other hand, those methods were not focused on increasing the accuracy performance in harmonic measurements.…”

Section: Introductionmentioning

confidence: 99%

Compensation of Nonlinearity of Voltage and Current Instrument Transformers

Cataliotti

Cosentino

Crotti

et al. 2019

IEEE Trans. Instrum. Meas.

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This paper aims at characterizing and improving the metrological performances of Current (CT) and Voltage Instrument Transformers (VT) in harmonic measurements in power system. A theoretical analysis is carried out to demonstrate that, due to the iron core non linearity, CT and VT output signal is distorted even when the input signal is a pure sinusoidal. Starting from this analysis, a new method for CT and VT characterization and compensation is proposed. In a first step, they are characterized in sinusoidal conditions and the harmonic phasors of the distorted output are measured; in the second step, these phasors are used to compensate the harmonic phasors measured in normal operating conditions, which are typically distorted. The proposed characterization and compensation techniques are called SINDICOMP (SINusoidal characterization for DIstortion COMPensation). Several experimental tests, using high accuracy calibration setups, have been performed to verify the proposed methods. The experimental results showed that the SINDICOMP technique assures a significant improvement of CT and VT metrological performances in harmonic measurements.

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Section: Introductionmentioning

confidence: 99%

Compensation of Nonlinearity of Voltage and Current Instrument Transformers

Cataliotti

Cosentino

Crotti

et al. 2019

IEEE Trans. Instrum. Meas.

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“…However, there is a limitation to reduce the number of required curves, because the hysteresis curves have quite different shapes, from 80% of the rated voltage to 120% of the rated voltage. For CT compensation, the exciting current was decomposed into the core-loss current and magnetizing currents and the λ-im curve was used to estimate the latter, instead of the hysteresis curve [6]. This contributes to significantly reduce the number of curves required for compensation because the λ-im curves have very similar patterns over the wide region of the current.…”

Section: Proposed Compensation Scheme Of a Measurement Vtmentioning

confidence: 99%

“…This contributes to significantly reduce the number of curves required for compensation because the λ-im curves have very similar patterns over the wide region of the current. Afterwards, we will describe the proposed compensation scheme for a measurement VT to improve the accuracy, which uses the λ-im curve instead of the hysteresis curve as in [6]. Figure 1 shows an equivalent circuit of an iron-cored VT.…”

Section: Proposed Compensation Scheme Of a Measurement Vtmentioning

confidence: 99%

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Development of a Compensation Scheme for a Measurement Voltage Transformer Using the Hysteresis Characteristics of a Core

Lee

Park²,

Hur

et al. 2015

Energies

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This paper describes the design, evaluation, and implementation of a compensation scheme for a measurement voltage transformer (VT) using the hysteresis characteristics of the core. The error of a VT is caused by the primary winding voltage and secondary winding voltage. The latter depends on the secondary current, whereas the former depends on the primary current, which is an aggregate of the exciting and secondary currents. The secondary current is obtained directly from the secondary voltage and is used to obtain the voltage across the secondary winding. For the primary current, the exciting current is decomposed into two components: core-loss and magnetizing currents. The magnetizing current is obtained by the flux-magnetizing current curve instead of the hysteresis loop to minimize the required loops for compensation. The core-loss current is obtained by dividing the primary induced voltage by the core-loss resistance. Finally, the estimated voltages across the primary and secondary windings are added to the measured secondary voltage for compensation. The scheme can significantly improve the accuracy of a VT. The results of the performance of compensator are shown in the experimental test. The accuracy of the measurement VT improves from 1.0C class to 0.1C class. The scheme can help to

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“…All mentioned external factors conditioning the rms values of the self-generated higher harmonics by the inductive CT into the secondary current must be considered to ensure effective compensation. None of the methods proposed in the papers [11][12][13][14][15] provides this. The nonlinear mathematical models can be used to compensate the measured value [16].…”

Section: Introductionmentioning

confidence: 99%

Nonlinearity of Magnetic Core in Evaluation of Current and Phase Errors of Transformation of Higher Harmonics of Distorted Current by Inductive Current Transformers

Kaczmarek

Stano

2020

IEEE Access

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The novelty of the paper contributes to the increase of the reliability of the methods used for evaluation of the inductive CTs accuracy of transformation of the distorted current. The results of performed analyses shows that the values of current and phase errors of transformation of the low order higher harmonics by inductive CT depends significantly from the phase angle between transformed higher harmonics of the distorted primary current and the self-generated higher harmonics of the secondary current. Moreover, higher harmonics of the distorted primary current may increase the peak value of the magnetic flux density in the magnetic core. Then the impact of the self-generated low order harmonics resulting from the nonlinearity of the magnetic core on values of current and phase errors of transformation of the higher harmonics of the distorted primary current is increased. Proposed evaluation procedure enables determination of the maximum values of current and phase errors of transformation of the higher harmonics of the distorted primary current. It is essential to determine the accuracy class. In such approach the impact of the secondary current's distortion caused by the nonlinearity of the magnetic core and the influence of the harmonic distortion on the peak value of the magnetic flux density are considered. Therefore, transformation accuracy of tested CT is ensured for specified range and type of the load of the secondary winding, rms values of primary current and its distortion. INDEX TERMS inductive current transformer, nonlinearity of magnetic core, transformation accuracy, distorted current, power quality, composite error, current and phase errors at harmonics.

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Development of a compensation algorithm for a measurement current transformer

Cited by 12 publications

References 10 publications

Compensation of Nonlinearity of Voltage and Current Instrument Transformers

Compensation of Nonlinearity of Voltage and Current Instrument Transformers

Development of a Compensation Scheme for a Measurement Voltage Transformer Using the Hysteresis Characteristics of a Core

Nonlinearity of Magnetic Core in Evaluation of Current and Phase Errors of Transformation of Higher Harmonics of Distorted Current by Inductive Current Transformers

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