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VACUUM ›› 2026, Vol. 63 ›› Issue (1): 54-60.doi: 10.13385/j.cnki.vacuum.2026.01.09

• Measurement and Control • Previous Articles     Next Articles

Monitoring Method of Vacuum Degree of High-voltage Power Circuit Breaker Based on Laser Induced Plasma

WANG Jinshan1, WANG Jiawei1, ZHANG Yongxi1, XU Chao1, ZHAN Chunming2   

  1. 1. State Grid Xinjiang Electric Power Co., Ltd. Kuitun Power Supply Company, Kuitun 833200, China;
    2. Shenyang Vacuum Technology Institute Co., Ltd., Shenyang 110042, China
  • Received:2025-03-05 Online:2026-01-25 Published:2026-02-02

Abstract: Traditional indirect measurement methods of vacuum degree may introduce additional errors due to the coupling of multiple physical processes, resulting in low accuracy of the vacuum degree measurement. Thus, a vacuum monitoring method for high-voltage power circuit breakers based on laser-induced plasma is proposed. Firstly, by using ultrafast laser-induced breakdown spectroscopy technology, high-energy laser pulses are focused on the gap area of the circuit breaker contacts to bombard the shielding cover of the high-voltage power circuit breaker, thereby the laser plasma is induced. Subsequently, characteristic parameters of the plasma such as radial emissivity, temperature, and feather length are extracted. Finally, the relationship between three characteristic parameters and vacuum degree is obtained through experiments. The results show that this method can effectively extract plasma radial emissivity, temperature, and feather length characteristic parameters, and accurately monitor the vacuum degree of circuit breakers.

Key words: laser induction, plasma, high-voltage power, circuit breaker, vacuum degree monitoring, Abel inverse transformation

CLC Number:  TP391

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