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A Novel Method to Directly Analyze Dissolved Acetic Acid in Transformer Oil without Extraction Using Raman Spectroscopy

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  • Fu Wan

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Lingling Du

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China
    Chengdu Power Supply Company of State Grid, Chengdu 610041, China)

  • Weigen Chen

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Pinyi Wang

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Jianxin Wang

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

  • Haiyang Shi

    (State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China)

Abstract

Analyzing the concentration of low molecular acids dissolved in oil is vital in the oil-paper insulation aging diagnostic procedure of power transformers. The existing methods cannot distinguish between different acid types and their strengths. In this study, an improved solution Raman detection platform is fabricated. The direct measurement of dissolved acetic acid, a kind of low molecular acids, is observed in transformer oil without extraction. The Raman shift line of oil-dissolved acetic acid at 891 cm −1 corresponding to H–C–H symmetrical swing and O–H swing modes is taken as its characteristic value. Taking Raman shift line of pure oil at 932 cm −1 as an internal standard, a linear regression curve for quantitative analysis is obtained with a slope of 0.19. The best platform parameter of accumulation number is 300, which is determined by Allan deviation analysis. The current concentration detection limit and accuracy for oil-dissolved acetic acid are obtained at about 0.68 mg/mL and 91.66%, separately. The results show that Raman spectroscopy could be a useful alternative method for evaluation insulation aging state of an operating power transformer in the future.

Suggested Citation

  • Fu Wan & Lingling Du & Weigen Chen & Pinyi Wang & Jianxin Wang & Haiyang Shi, 2017. "A Novel Method to Directly Analyze Dissolved Acetic Acid in Transformer Oil without Extraction Using Raman Spectroscopy," Energies, MDPI, vol. 10(7), pages 1-12, July.
    • Handle: RePEc:gam:jeners:v:10:y:2017:i:7:p:967-:d:104228
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    References listed on IDEAS

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    1. Janvier Sylvestre N’cho & Issouf Fofana & Yazid Hadjadj & Abderrahmane Beroual, 2016. "Review of Physicochemical-Based Diagnostic Techniques for Assessing Insulation Condition in Aged Transformers," Energies, MDPI, vol. 9(5), pages 1-29, May.
    2. Jian Feng Li & Yi Fan Huang & Yong Ding & Zhi Lin Yang & Song Bo Li & Xiao Shun Zhou & Feng Ru Fan & Wei Zhang & Zhi You Zhou & De Yin Wu & Bin Ren & Zhong Lin Wang & Zhong Qun Tian, 2010. "Shell-isolated nanoparticle-enhanced Raman spectroscopy," Nature, Nature, vol. 464(7287), pages 392-395, March.
    3. Johannes Kiefer, 2015. "Recent Advances in the Characterization of Gaseous and Liquid Fuels by Vibrational Spectroscopy," Energies, MDPI, vol. 8(4), pages 1-33, April.
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    Cited by:

    1. Kakou D. Kouassi & Issouf Fofana & Ladji Cissé & Yazid Hadjadj & Kouba M. Lucia Yapi & K. Ambroise Diby, 2018. "Impact of Low Molecular Weight Acids on Oil Impregnated Paper Insulation Degradation," Energies, MDPI, vol. 11(6), pages 1-13, June.

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