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Lightning Current Measurement Method Using Rogowski Coil Based on Integral Circuit with Low-Frequency Attenuation

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|August 10, 2024
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Summary

This study introduces a new Rogowski coil method to accurately measure lightning currents on transmission lines. The technique effectively corrects low-frequency distortion, improving waveform restoration for critical electrical infrastructure monitoring.

Keywords:
Rogowski coilintegral correctionlightning current measurementlow-frequency attenuation feedback networklow-frequency distortion

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Area of Science:

  • Electrical Engineering
  • Electromagnetics
  • Measurement Science

Background:

  • Rogowski coils are used for lightning current measurement on transmission lines.
  • Low-frequency distortion is a significant challenge in these measurements, affecting accuracy.
  • Existing methods struggle to correct for this distortion effectively.

Purpose of the Study:

  • To develop and validate a novel Rogowski coil-based measurement method for lightning currents.
  • To address and correct low-frequency distortion inherent in Rogowski coil measurements.
  • To improve the accuracy and reliability of lightning current waveform restoration.

Main Methods:

  • Analysis of low-frequency distortion causes in Rogowski coil measurements using frequency domain analysis.
  • Design of an optimized integration circuit with low-frequency attenuation feedback for distortion correction.
  • Incorporation of a high-pass filtering and voltage-divided sampling circuit to enhance system performance.
  • Selection of components and operational amplifiers (op-amps) to expand measurement bandwidth.

Main Results:

  • The proposed method effectively corrects low-frequency distortion in lightning current measurements.
  • The lower measurement frequency limit was successfully extended down to 20 Hz.
  • Accurate restoration of the measured lightning current waveform was achieved.
  • Reduced impact of low-frequency noise and op-amp DC bias on the integration circuit.

Conclusions:

  • The developed Rogowski coil measurement method with low-frequency attenuation feedback significantly improves lightning current measurement accuracy.
  • This technique provides a reliable solution for overcoming low-frequency distortion challenges in transmission line monitoring.
  • The enhanced measurement system offers precise waveform restoration, crucial for power system protection and analysis.