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The magnetic flux of potential transformer (PT) will shift under the condition of DC magnetic bias, resulting in the iron core working in the non-linear zone and the measurement error of PT increasing sharply. In order to overcome the problem of insufficient ability to resist DC magnetic bias of traditional PT, the open magnetic circuit PT (OMC-PT) with ‘T-shaped’ core structure is proposed. The anti-DC magnetic bias principle of the PT with open magnetic circuit is analyzed, and the parameters of the 25 kV PT for electric railway are designed. Based on the finite element method, the magnetic field distribution characteristic and the secondary voltage waveforms of the transformer under different DC bias voltages are calculated. The ratio error and phase error of the PT are obtained by using the three-parameter sine curve fitting algorithm. This research can provide reference for the design of anti-DC magnetic bias PT.

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Simulation Study on Transfer Characteristic of Potential Transformer with Open Magnetic Circuit Under DC Magnetic Bias

  • 会议论文

  • 发表日期：

    2026年

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  • Jian Wang,
  • Jian Liu,
  • Junjie Liu,
  • Junjun Huang,
  • Shuhui Yi,
  • Hao Liu,
  • Genrong Wang,
  • Ming Li

摘要

The magnetic flux of potential transformer (PT) will shift under the condition of DC magnetic bias, resulting in the iron core working in the non-linear zone and the measurement error of PT increasing sharply. In order to overcome the problem of insufficient ability to resist DC magnetic bias of traditional PT, the open magnetic circuit PT (OMC-PT) with ‘T-shaped’ core structure is proposed. The anti-DC magnetic bias principle of the PT with open magnetic circuit is analyzed, and the parameters of the 25 kV PT for electric railway are designed. Based on the finite element method, the magnetic field distribution characteristic and the secondary voltage waveforms of the transformer under different DC bias voltages are calculated. The ratio error and phase error of the PT are obtained by using the three-parameter sine curve fitting algorithm. This research can provide reference for the design of anti-DC magnetic bias PT.