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<p>Environmental humidity is one of the important factors affecting corona discharge in transmission lines. Studies have shown that corona loss in transmission lines increases sharply when relative humidity rises. As an important development stage of negative corona discharge in transmission lines, studying the waveform changes under different humidity conditions plays a crucial role in controlling corona discharge in high-voltage direct current transmission lines. The influence of humidity on the corona discharge parameters was calculated using the Wielang approximation, a fluid dynamics model was established, and the negative polarity corona discharge characteristics of the coaxial electrode structure in the air gap under atmospheric pressure were studied, and the Trichel pulse waveforms at different relative humidity were obtained. The electric field intensity and the density distribution characteristics of three types of charged particles (positive ions, electrons and negative ions) in the discharge region at different stages were analyzed and discussed, and the mechanism of variation of the pulse waveform at different relative humidity was presented. Through simulation, it was found that as the relative humidity increased, both the average amplitude and frequency of the discharge pulses increased, and corresponding waveform characteristics appeared in the wire discharge at different relative humidities: When the relative humidity ranged from 0 to 20%, the discharge consistently appeared as typical Trichel pulses. Between 20 and 55% relative humidity, discharge pulses were accompanied by larger base currents. In the 55–65% relative humidity range, pulse amplitudes showed a regular alternating pattern of large and small. For relative humidity values from 65 to 80%, the descending phase of larger amplitude pulses featured continuous smaller amplitude pulse repetitions. Finally, when the relative humidity exceeded 80%, the discharge waveform transformed into a steady current without pulses. These findings offer a theoretical basis for negative corona discharge waveforms in air gap coaxial electrode structures under varying humidities and provide valuable insight into the microscopic physical mechanism of corona discharge in transmission lines.</p>

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Research on the influence of humidity on the Trichel pulse waveform of coaxial electrode negative corona

  • 期刊论文

  • 发表日期：

    2026年5月16日

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  • Yuanqing Liu,
  • Zhengshan Zhong,
  • Xiaotian Zhang,
  • Bin Liu

摘要

Environmental humidity is one of the important factors affecting corona discharge in transmission lines. Studies have shown that corona loss in transmission lines increases sharply when relative humidity rises. As an important development stage of negative corona discharge in transmission lines, studying the waveform changes under different humidity conditions plays a crucial role in controlling corona discharge in high-voltage direct current transmission lines. The influence of humidity on the corona discharge parameters was calculated using the Wielang approximation, a fluid dynamics model was established, and the negative polarity corona discharge characteristics of the coaxial electrode structure in the air gap under atmospheric pressure were studied, and the Trichel pulse waveforms at different relative humidity were obtained. The electric field intensity and the density distribution characteristics of three types of charged particles (positive ions, electrons and negative ions) in the discharge region at different stages were analyzed and discussed, and the mechanism of variation of the pulse waveform at different relative humidity was presented. Through simulation, it was found that as the relative humidity increased, both the average amplitude and frequency of the discharge pulses increased, and corresponding waveform characteristics appeared in the wire discharge at different relative humidities: When the relative humidity ranged from 0 to 20%, the discharge consistently appeared as typical Trichel pulses. Between 20 and 55% relative humidity, discharge pulses were accompanied by larger base currents. In the 55–65% relative humidity range, pulse amplitudes showed a regular alternating pattern of large and small. For relative humidity values from 65 to 80%, the descending phase of larger amplitude pulses featured continuous smaller amplitude pulse repetitions. Finally, when the relative humidity exceeded 80%, the discharge waveform transformed into a steady current without pulses. These findings offer a theoretical basis for negative corona discharge waveforms in air gap coaxial electrode structures under varying humidities and provide valuable insight into the microscopic physical mechanism of corona discharge in transmission lines.