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Corona Discharge Characteristics under Variable Frequency and Pressure Environments.

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This study investigates how low-pressure and high-frequency conditions affect corona discharge in electrical systems for more electric aircrafts (MEAs) and all-electric aircrafts (AEAs). Findings aid in designing more reliable aircraft insulation systems.

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Area of Science:

  • Electrical Engineering
  • Aerospace Engineering
  • Materials Science

Background:

  • More electric aircrafts (MEAs) and all-electric aircrafts (AEAs) utilize higher electrical power, necessitating increased distribution voltages.
  • Higher voltages and harsh aircraft environments (low pressure, high frequency) increase risks of partial discharges and insulation breakdown.
  • Understanding corona discharge is crucial for preventing arc tracking and insulation degradation in aircraft wiring.

Purpose of the Study:

  • To experimentally analyze the impact of low-pressure and high-frequency environments on visual corona discharge voltage.
  • To determine the corona extinction voltage under conditions relevant to aircraft applications.
  • To evaluate a low-cost CMOS imaging sensor for detecting and quantifying corona discharges.

Main Methods:

  • A rod-to-plane electrode configuration was used for testing.
  • Experiments were conducted within pressure ranges of 20-100 kPa and frequency ranges of 50-1000 Hz.
  • A high-resolution CMOS imaging sensor and leakage current analysis with an oscilloscope were employed to detect discharges.

Main Results:

  • The study experimentally determined corona extinction voltage under simulated aircraft conditions.
  • A low-cost CMOS imaging sensor effectively located discharge points and measured discharge intensity.
  • Corroboration of sensor data was achieved through leakage current analysis.

Conclusions:

  • The experimental data provides valuable insights into insulation system design for MEAs and AEAs.
  • The findings highlight the risks associated with increased voltage, high frequencies, and low pressures on insulation.
  • The developed imaging technique offers a simple, cost-effective, and sensitive method for analyzing electrical discharges in aircraft systems.