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Conducting a three-phase short circuit test on an unloaded synchronous machine helps understand its impact on the system. The AC fault current's oscillogram, with the DC offset removed, reveals that the waveform amplitude decreases from an initially high value to a steady-state level for one phase of the machine.
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Non-Contact Current Measurement for Three-Phase Rectangular Busbars Using TMR Sensors.

Huafeng Su1, Haojun Li1, Weihao Liang1

  • 1Dongguan Power Supply Bureau of Guangdong Power Grid Co., Ltd., Dongguan 523120, China.

Sensors (Basel, Switzerland)
|January 23, 2024
PubMed
Summary
This summary is machine-generated.

This study introduces a non-contact current measurement method using tunneling magneto-resistance (TMR) sensors for three-phase busbars. The system achieves high accuracy with less than 2.5% RMS error and 1° phase error, enabling reliable power monitoring.

Keywords:
TMR sensorsdistribution cabinetnon-contact current measurementonline calibrationrectangular busbars

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Area of Science:

  • Electrical Engineering
  • Sensor Technology
  • Power Systems

Background:

  • Accurate current measurement is crucial for power system monitoring and control.
  • Existing non-contact methods often face limitations in dynamic range, bandwidth, or installation complexity.
  • Three-phase rectangular busbars require specialized non-contact sensing solutions.

Purpose of the Study:

  • To develop and validate a novel non-contact current measurement method for three-phase rectangular busbars.
  • To utilize the advantages of tunneling magneto-resistance (TMR) sensors for enhanced measurement performance.
  • To achieve accurate and reliable online calibration of the current sensor system.

Main Methods:

  • A non-contact current sensor array using three TMR sensors was designed and positioned near busbars.
  • A thyristor-controlled resistive load was employed for generating identifiable calibration currents.
  • A robust method was developed to extract voltage components from TMR sensor signals for calibration.
  • A complete measurement system integrating the TMR sensor, calibrator, and data acquisition was implemented.

Main Results:

  • The developed system demonstrated a relative RMS error of less than 2.5% and a phase error of less than 1° compared to a commercial probe.
  • Nonlinearity error of the TMR-based current sensor was found to be better than 0.8%.
  • The proposed online calibration method proved effective in establishing accurate current-to-magnetic field relationships.

Conclusions:

  • The proposed non-contact current measurement method using TMR sensors is accurate and reliable for three-phase rectangular busbars.
  • The system's performance, including low error margins and effective online calibration, makes it suitable for practical power distribution applications.
  • TMR sensors offer a viable solution for non-contact current sensing due to their favorable characteristics.