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Measurement System for Current Transformer Calibration from 50 Hz to 150 kHz Using a Wideband Power Analyzer.

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A new method simplifies current transformer (CT) characterization up to 150 kHz. This wideband calibration system improves accuracy for monitoring grid stability and power quality with renewable energy sources.

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Area of Science:

  • Electrical Engineering
  • Metrology
  • Power Systems

Background:

  • Accurate current transformer (CT) performance is vital for grid stability and power quality.
  • Traditional CT calibration methods are complex and limited in frequency range.
  • Increasing power quality issues necessitate wider frequency characterization.

Purpose of the Study:

  • To develop a simplified and expanded method for CT characterization.
  • To enable direct measurement of CT secondary currents across an extended frequency range.
  • To evaluate factors influencing measurement uncertainty and repeatability.

Main Methods:

  • Developed a calibration system using a sampling ammeter (power analyzer).
  • Enabled direct measurement of unknown and reference CT secondary currents.
  • Evaluated operational conditions like warm-up, grounding, shunt, and cable types.

Main Results:

  • Achieved expanded magnitude ratio uncertainties of 10 ppm (k=2) up to 10 kHz.
  • Attained uncertainties below 120 ppm from 10 kHz to 150 kHz (excluding reference CT uncertainty).
  • Highlighted the importance of minimizing parasitic impedances and maintaining consistent testing conditions.

Conclusions:

  • The developed system simplifies and expands CT calibration capabilities.
  • Provides practical guidance for characterizing CTs in the supraharmonic range.
  • Forms a foundation for future standardization efforts in wideband CT calibration.