Laser Journal, Volume. 45, Issue 12, 200(2024)

Investigation of FOCT measurement error induced by vibration on delay line ring

LIU Yong1... LIU Bin1, HUANG Junchang1,2, HUANG Yongxi1, HU Kunfang1, LU Shufeng3, LIU Jia4,5, and WU Chongqing45 |Show fewer author(s)
Author Affiliations
  • 1China Electric Power Research Institute Wuhan branch, Wuhan 430074, China
  • 2Huazhong University of Science and Technology, Wuhan 430074, China
  • 3State Grid Jiangsu Electric Power Co. Ltd., Nanjing 210000, China
  • 4Nanjing Henggao photoelectric Research Institute Co., LTD, Nanjing 210046, China
  • 5Beijing Jiaotong University Tangshan Research Institute, Tangshan Hebei 063004, China
  • show less

    Fiber-optic current transformer (FOCT) is an important primary equipment in UHVDC transmission system. FOCT based on PZT modulation is a widely used modulation mode, in which the polarization-maintaining fiber delay ring is the most sensitive to vibration, that is one of the main errors of FOCT under vibration. In this paper, the influence of vibration on FOCT error is analyzed on mechanical and optical characteristics. It is pointed out that the external vibration will produce an additional modulation superimposed on PZT modulation, which will change the harmonic ratio of the output signal and introducing an error. Both theoretical analysis and experimental results show that the mechanical resonance characteristics of the fiber delay ring have a significant influence on the error. The resonance curve and calculation formula for multiple resonant points are obtained, and the error for different frequencies, different accelerations and different measured currents are given. The theoretical analysis is basically consistent with the experiment.

    Tools

    Get Citation

    Copy Citation Text

    LIU Yong, LIU Bin, HUANG Junchang, HUANG Yongxi, HU Kunfang, LU Shufeng, LIU Jia, WU Chongqing. Investigation of FOCT measurement error induced by vibration on delay line ring[J]. Laser Journal, 2024, 45(12): 200

    Download Citation

    EndNote(RIS)BibTexPlain Text
    Save article for my favorites
    Paper Information

    Category:

    Received: Feb. 17, 2024

    Accepted: Mar. 10, 2025

    Published Online: Mar. 10, 2025

    The Author Email:

    DOI:10.14016/j.cnki.jgzz.2024.12.200

    Topics