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To effectively assess grounding grid faults without excavation, a non-contact, rapid evaluation technique is essential. Transient electromagnetic detection methods exhibit remarkable adaptability in this regard. To enhance system performance, this study proposes a unipolar transient electromagnetic transmission circuit topology based on clamp circuitry. This topology integrates energy storage inductors with clamp circuits, reducing the rise and fall times of emitted currents, improving rise time linearity, and achieving symmetric rise and fall edges. This enables the generation of ideal symmetric trapezoidal current transmission waveforms, thereby increasing waveform utilization and sampling rates. The paper thoroughly examines and analyzes the operational principles of the proposed unipolar transient electromagnetic transmission circuit topology, validating its functionality through simulation analysis and experimental verification. Results indicate the feasibility of the proposed topology, based on inductive energy storage and voltage clamping, to significantly enhance the operational performance of transient electromagnetic detection systems.

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Design on Unipolar Symmetrical Trapezoidal Pulsed Current Transmission Circuit for Grounding Grid Fault Detection in Substations

  • 会议论文

  • 发表日期：

    2025年

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  • Ruobing He,
  • Zhen Li,
  • Linkun Yuan,
  • Jinglai Li,
  • Jiaxin Chen,
  • Longjie Li

摘要

To effectively assess grounding grid faults without excavation, a non-contact, rapid evaluation technique is essential. Transient electromagnetic detection methods exhibit remarkable adaptability in this regard. To enhance system performance, this study proposes a unipolar transient electromagnetic transmission circuit topology based on clamp circuitry. This topology integrates energy storage inductors with clamp circuits, reducing the rise and fall times of emitted currents, improving rise time linearity, and achieving symmetric rise and fall edges. This enables the generation of ideal symmetric trapezoidal current transmission waveforms, thereby increasing waveform utilization and sampling rates. The paper thoroughly examines and analyzes the operational principles of the proposed unipolar transient electromagnetic transmission circuit topology, validating its functionality through simulation analysis and experimental verification. Results indicate the feasibility of the proposed topology, based on inductive energy storage and voltage clamping, to significantly enhance the operational performance of transient electromagnetic detection systems.