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To obtain nanosecond-scale leading edge pulse voltage waveforms fed into high-voltage coaxial cables, a compact capacitive divider has been developed. This capacitive divider senses the differential signals of the pulse voltage, featuring a coaxial structure design that is highly integrated with the high-voltage cable. The sampling electrode forms a high-voltage arm capacitance with the inner conductor of the cable, while the outer conductor of the cable constitutes the low-voltage arm capacitance. The theoretical transformation ratio and frequency response of the capacitive divider have been calculated, and a high-voltage pulse testing platform has been established to calibrate the transformation ratio of the divider. The results indicate that the developed capacitive divider possesses the capability for nanosecond-scale leading edge pulse voltage measurement, meeting the insulation testing requirements for high-voltage coaxial cables under hundreds of kilovolts nanosecond pulse voltage conditions.

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Development of a Capacitive Divider for Nanosecond Pulse Voltage Measurement in Flexible High-Voltage Cables

  • 会议论文

  • 发表日期：

    2025年

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  • Dingfang Ke,
  • Fangfang Wu,
  • Hao Wu,
  • Yibo Gao,
  • Xuyang Zhao,
  • Xue Lin,
  • Shengyi Xie

摘要

To obtain nanosecond-scale leading edge pulse voltage waveforms fed into high-voltage coaxial cables, a compact capacitive divider has been developed. This capacitive divider senses the differential signals of the pulse voltage, featuring a coaxial structure design that is highly integrated with the high-voltage cable. The sampling electrode forms a high-voltage arm capacitance with the inner conductor of the cable, while the outer conductor of the cable constitutes the low-voltage arm capacitance. The theoretical transformation ratio and frequency response of the capacitive divider have been calculated, and a high-voltage pulse testing platform has been established to calibrate the transformation ratio of the divider. The results indicate that the developed capacitive divider possesses the capability for nanosecond-scale leading edge pulse voltage measurement, meeting the insulation testing requirements for high-voltage coaxial cables under hundreds of kilovolts nanosecond pulse voltage conditions.