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Abnormal states in the secondary circuits of metering current transformers not only cause economic losses to power grid enterprises, but may also lead to safety accidents. To achieve accurate online monitoring of secondary circuit status, a secondary circuit state monitoring method based on 10 kHz impedance characteristics has been proposed through theoretical studies of equivalent circuits under different states. This method employs a 10 kHz impedance measurement technique using micro-transformer coupling and vector voltage-current analysis, and a dedicated current transformer circuit monitoring device has been developed. Experimental results demonstrate that the developed device can accurately identify normal connections, secondary terminal short-circuits, secondary open-circuits, and primary bypass states under full operating conditions, including current transformer ratios of 30/5–2000/5.

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Research on Current Transformer Secondary Circuit Status Monitoring Technology Based on Heterogeneous Frequency Excitation Response

  • 会议论文

  • 发表日期：

    2026年

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  • Liu Junjie,
  • Liu Jian,
  • Wang Jian,
  • Yi Shuhui,
  • Huang Junjun,
  • Liu Tong

摘要

Abnormal states in the secondary circuits of metering current transformers not only cause economic losses to power grid enterprises, but may also lead to safety accidents. To achieve accurate online monitoring of secondary circuit status, a secondary circuit state monitoring method based on 10 kHz impedance characteristics has been proposed through theoretical studies of equivalent circuits under different states. This method employs a 10 kHz impedance measurement technique using micro-transformer coupling and vector voltage-current analysis, and a dedicated current transformer circuit monitoring device has been developed. Experimental results demonstrate that the developed device can accurately identify normal connections, secondary terminal short-circuits, secondary open-circuits, and primary bypass states under full operating conditions, including current transformer ratios of 30/5–2000/5.