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Solid Insulation Partial Discharge Detection of Low-Intensity Noise Fiber Laser Based on Polarized Light Demodulation

Author

Listed:
  • Zhenpeng Zhang

    (China Electric Power Research Institute, Wuhan 430074, China)

  • Zhengbo Liang

    (China Electric Power Research Institute, Wuhan 430074, China)

  • Junping Hou

    (China Electric Power Research Institute, Wuhan 430074, China)

  • Li Chen

    (China Electric Power Research Institute, Wuhan 430074, China)

  • Lin Tang

    (China Electric Power Research Institute, Wuhan 430074, China)

  • Mingzhong Xu

    (China Electric Power Research Institute, Wuhan 430074, China)

Abstract

The distributed feedback fiber (DFB) laser has been extensively researched for the purpose of detecting partial discharges in power equipment. DFB is demodulated using an unbalanced interferometer, which is not only structurally complex but also prone to introducing significant noise when the fiber distance is long. In order to address this issue, this paper presents the design of a low-noise demodulation system. The theoretical model of external optical feedback noise is described in this study. The relationship between this noise and the DFB linewidth is established by introducing the external optical feedback coefficient C. The theoretical results demonstrate that the system noise is minimized when C is approximately 30. A low-noise partial discharge detection system combined with a polarization optical demodulation method is developed. The experimental results confirmed the local discharge detection capability of the system in solid insulation and significantly reduced the system noise. This result promotes wider application and promotion of DFB lasers.

Suggested Citation

  • Zhenpeng Zhang & Zhengbo Liang & Junping Hou & Li Chen & Lin Tang & Mingzhong Xu, 2025. "Solid Insulation Partial Discharge Detection of Low-Intensity Noise Fiber Laser Based on Polarized Light Demodulation," Energies, MDPI, vol. 18(4), pages 1-14, February.
    • Handle: RePEc:gam:jeners:v:18:y:2025:i:4:p:955-:d:1592945
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