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Analysis and Solutions for Frequent Fuse Tripping in Electromagnetic Voltage Transformers
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Chunli ZHANG1, Hongwen LIU2, Pengxing FANG3, Chenchao CHAI4, Wenqiong ZHANG5
Electric Drive | 2025, 55(7) : 87 - 96
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Electric Drive | 2025, 55(7): 87-96
Analysis and Solutions for Frequent Fuse Tripping in Electromagnetic Voltage Transformers
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Chunli ZHANG1, Hongwen LIU2, Pengxing FANG3, Chenchao CHAI4, Wenqiong ZHANG5
Affiliations
  • 1. Yunnan Electric Power Technology Co.，Ltd.，Kunming 650217，Yunnan，China
  • 2. Electric Power Research Institute of Yunnan Power Grid Co.，Ltd.，Kunming 650217，Yunnan，China
  • 3. Yunnan Power Grid Corporation Lincang Power Supply Bureau，Lincang 677000，Yunnan，China
  • 4. Yunnan Megasun Technology Co.，Ltd.，Kunming 650217，Yunnan，China
  • 5. Kunming KSEC Smart Airport Technology Co.，Ltd.，Kunming 650220，Yunnan，China
Published: 2025-07-20 doi: 10.19457/j.1001-2095.dqcd25555
Outline
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Incidents such as the burning of electromagnetic voltage transformers（PT），damage to primary harmonic suppressors，and fuse tripping occur frequently in low and medium voltage distribution systems due to ferroresonance，severely affecting the safe and stable operation of the system. Therefore，through theoretical analysis and combined with field case studies，it was verified that the saturation current produced by PT saturation due to electromagnetic transient impacts from system single-phase ground faults and circuit breaker operations was the main reason for the frequent fuse tripping. Secondly，the factors influencing the saturation current of PT was analyzed and the capacity of fuses to withstand the PT saturation current was tested. The research indicates that the probability of fuse tripping could be reduced by increasing the PT's DC resistance，choosing cylindrical harmonic suppressors with relatively high knee-point voltages of their volt-ampere characteristics，and increasing the rated current of the fuses. Finally，specific recommendations for the selection of PTs，harmonic suppressors，and fuses were provided，offering reference measures for resolving the issue of frequent fuse tripping in electromagnetic voltage transformers protected by fuses.

electromagnetic voltage transformers  /  fuses  /  frequent tripping
Chunli ZHANG, Hongwen LIU, Pengxing FANG, Chenchao CHAI, Wenqiong ZHANG. Analysis and Solutions for Frequent Fuse Tripping in Electromagnetic Voltage Transformers[J]. Electric Drive, 2025 , 55 (7) : 87 -96 . DOI: 10.19457/j.1001-2095.dqcd25555
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Article Info
doi: 10.19457/j.1001-2095.dqcd25555
  • Receive Date：2023-12-15
  • Online Date：2025-10-29
  • Published：2025-07-20
Article Data
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History
  • Received：2023-12-15
  • Revised：2024-02-18
Affiliations
    1. Yunnan Electric Power Technology Co.，Ltd.，Kunming 650217，Yunnan，China
    2. Electric Power Research Institute of Yunnan Power Grid Co.，Ltd.，Kunming 650217，Yunnan，China
    3. Yunnan Power Grid Corporation Lincang Power Supply Bureau，Lincang 677000，Yunnan，China
    4. Yunnan Megasun Technology Co.，Ltd.，Kunming 650217，Yunnan，China
    5. Kunming KSEC Smart Airport Technology Co.，Ltd.，Kunming 650220，Yunnan，China
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