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Why Should We Test the Wideband Transformation Accuracy of Inductive Current Transformers?

Author

Listed:
  • Ernest Stano

    (Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland)

  • Piotr Kaczmarek

    (Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland)

  • Michal Kaczmarek

    (Institute of Mechatronics and Information Systems, Lodz University of Technology, 90-537 Lodz, Poland)

Abstract

Inductive current transformers are characterized by different transformation accuracies for higher harmonics of distorted primary currents. Therefore, it is highly required to perform the tests of their metrological properties to choose the best unit that ensures the lowest values of current error and phase displacement. This study presents a comparison of two manufactured inductive current transformers. The results indicate that some inductive current transformers may be used to accurately transform distorted currents, enabling proper distortion of power metering and quality evaluation. However, to obtain adequate transformation properties in the wide frequency range, the cross-section of the magnetic core of the inductive current transformer should be oversized. Moreover, it is required to use a permalloy magnetic core instead of the typical transformer steel core. In the analyzed case, the metrological performance depends mainly on its accuracy for transforming the main component of the distorted primary current and self-generation of the low-order higher harmonics. This paper constitutes the starting point to define the limiting values of current error and phase displacement for the future wideband accuracy class extension for inductive CTs.

Suggested Citation

  • Ernest Stano & Piotr Kaczmarek & Michal Kaczmarek, 2022. "Why Should We Test the Wideband Transformation Accuracy of Inductive Current Transformers?," Energies, MDPI, vol. 15(15), pages 1-12, August.
    • Handle: RePEc:gam:jeners:v:15:y:2022:i:15:p:5737-:d:882481
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    References listed on IDEAS

    as
    1. Ernest Stano, 2021. "The Method to Determine the Turns Ratio Correction of the Inductive Current Transformer," Energies, MDPI, vol. 14(24), pages 1-16, December.
    2. Dariusz Brodecki & Ernest Stano & Mateusz Andrychowicz & Piotr Kaczmarek, 2021. "EMC of Wideband Power Sources," Energies, MDPI, vol. 14(5), pages 1-14, March.
    3. Michal Kaczmarek & Ernest Stano, 2021. "Why Should We Test the Wideband Transformation Accuracy of Medium Voltage Inductive Voltage Transformers?," Energies, MDPI, vol. 14(15), pages 1-16, July.
    4. Michal Kaczmarek & Piotr Kaczmarek, 2020. "Comparison of the Wideband Power Sources Used to Supply Step-Up Current Transformers for Generation of Distorted Currents," Energies, MDPI, vol. 13(7), pages 1-15, April.
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    1. Michal Kaczmarek & Ernest Stano, 2023. "New Approach to Evaluate the Transformation Accuracy of Inductive CTs for Distorted Current," Energies, MDPI, vol. 16(7), pages 1-15, March.
    2. Michal Kaczmarek & Ernest Stano, 2023. "Review of Measuring Methods, Setups and Conditions for Evaluation of the Inductive Instrument Transformers Accuracy for Transformation of Distorted Waveforms," Energies, MDPI, vol. 16(11), pages 1-17, May.
    3. Michal Kaczmarek & Piotr Kaczmarek & Ernest Stano, 2022. "The Performance of the High-Current Transformer during Operation in the Wide Frequencies Range," Energies, MDPI, vol. 15(19), pages 1-15, September.
    4. Michal Kaczmarek & Ernest Stano, 2023. "Challenges of Accurate Measurement of Distorted Current and Voltage in the Power Grid by Conventional Instrument Transformers," Energies, MDPI, vol. 16(6), pages 1-17, March.
    5. Michal Kaczmarek & Piotr Kaczmarek & Ernest Stano, 2022. "Evaluation of the Current Shunt Influence on the Determined Wideband Accuracy of Inductive Current Transformers," Energies, MDPI, vol. 15(18), pages 1-12, September.

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