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VACUUM ›› 2026, Vol. 63 ›› Issue (4): 58-64.doi: 10.13385/j.cnki.vacuum.2026.04.09

• Measurement and Control • Previous Articles     Next Articles

Multi Source State Recognition Method for on-Load Tap Changer Based on Vacuum Arc Extinguishing Characteristics

YU Yifan, LIANG Qiongxin, CHEN Weiqing   

  1. State Grid Linhai Power Supply Company, Taizhou 317000, China
  • Received:2025-08-18 Published:2026-07-27

Abstract: A safety state identification method based on the vacuum degree arc energy coupling model is proposed to address the problem of transformer oil carbonization caused by sealing failure of vacuum arc extinguishing chamber. By analyzing the diffusion characteristics of metal vapor in the vacuum arc extinguishing chamber (pressure≤10-4 Pa), a synergistic criterion for ultraviolet radiation, vibration signals, and acetylene growth rate is established. According to the Markov constraint conditions of the transformer vacuum on-load tap changer, the average resistance in the topology circuit of the tap changer is defined, and the electrical stress equation of the tap changer is solved to complete the electrical stress analysis of the transformer vacuum on-load tap changer. Using the electrical stress equation, the transient impulse component and sensitive frequency band component of the tap changer are extracted, and the electrical stress equation of the tap changer is derived to solve the safe state threshold of the switch operation and achieve the identification of the safe state of the transformer vacuum on-load tap changer operation. The results show that effectively determining the real-time voltage regulation status of transformer vacuum on-load tap changers based on vibration signals and power signals is beneficial for ensuring the accuracy of switch operation status recognition results.

Key words: arc extinguishing chamber, CuCr50 alloy contact, electrical stress, OLTC, state recognition

CLC Number:  TP311

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