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The widespread use of high-voltage equipment such as Gas Insulated Switchgear (GIS) in power systems has led to the emergence of VFTO (Very Fast Transient Overvoltages, VFTO) during switching operations. VFTO poses a significant risk to the insulation integrity of power equipment. Traditional lightning impulse voltage generators, with their relatively long front times, can no longer meet the insulation testing requirements for VFTO pulses in modern power equipment, resulting in a general lack of experimental research capabilities. This paper designs and develops a fast pulse source system centered on a fast Marx generator, utilizing a compact Marx pulse source with a rise time in the tens of nanoseconds and a peak voltage reaching 1 MV. The system can simulate VFTO pulses to assess the insulation performance of power equipment such as high-voltage cables. It effectively prevents potential hazards caused by VFTO, including flashover failures in disc insulators, false fault reports, or malfunctions of relay protection devices, thereby ensuring the operational safety of transmission and distribution networks.

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Development of Nanosecond Pulse Source for VFTO Research and Assessment Testing

  • 会议论文

  • 发表日期：

    2025年

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

摘要

The widespread use of high-voltage equipment such as Gas Insulated Switchgear (GIS) in power systems has led to the emergence of VFTO (Very Fast Transient Overvoltages, VFTO) during switching operations. VFTO poses a significant risk to the insulation integrity of power equipment. Traditional lightning impulse voltage generators, with their relatively long front times, can no longer meet the insulation testing requirements for VFTO pulses in modern power equipment, resulting in a general lack of experimental research capabilities. This paper designs and develops a fast pulse source system centered on a fast Marx generator, utilizing a compact Marx pulse source with a rise time in the tens of nanoseconds and a peak voltage reaching 1 MV. The system can simulate VFTO pulses to assess the insulation performance of power equipment such as high-voltage cables. It effectively prevents potential hazards caused by VFTO, including flashover failures in disc insulators, false fault reports, or malfunctions of relay protection devices, thereby ensuring the operational safety of transmission and distribution networks.