Aging analyses of transformer oil based on optical properties of LIF spectroscopy

IF 4.3 2区 化学 Q1 SPECTROSCOPY
Zahra Zare , Parviz Parvin , Amir Jafargholi , Ahmad Reza Rabbani , S. Zahra Mortazavi
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Abstract

Here, the real time pyrolysis characteristics, the degradation degree and the aging time of the transformer oil have been investigated using laser induced fluorescence (LIF) spectroscopy. The signal elevation up to four-fold and the lucid red shift up to 10 nm are obtained against those of fresh oil. The fluorescence signal and the corresponding spectral shift are demonstrated to follow a linear correlation in terms of aging time. It mainly arises from the gradual alteration of the fluorescence properties of the transformer oil’s aromatic rings during steady operation of the power transformer. In fact, the degraded oil undergoes the transition from mono cyclic aromatic rings to poly cyclic ones as well as the abundant poly cyclic rings with the aging time. Moreover, the fluorescence parameters obviously elucidate the real time competence of LIF to assess various degrees of oil degradation via steady sampling in the operational power transformers. Furthermore, the empirical findings are supported by FTIR, TGA and UV-PL accompanying the fluid mechanical/chemical routine tests. FTIR spectra and TG analyses, alongside the other characteristic measurements strongly indicate the increasing population of aromatic hydrocarbons, and the elevation of the activation energy in terms of aging time.

Abstract Image

基于LIF光谱光学特性的变压器油老化分析
本文利用激光诱导荧光(LIF)光谱技术研究了变压器油的实时热解特性、降解程度和老化时间。与新鲜油相比,信号提升高达4倍,红移高达10 nm。荧光信号和相应的光谱位移被证明在老化时间方面遵循线性相关。它主要是由于电力变压器在稳定运行过程中,变压器油芳香环的荧光性质逐渐发生变化。实际上,随着老化时间的延长,降解油经历了由单环芳烃环向多环芳烃环过渡的过程,并逐渐形成丰富的多环芳烃环。此外,荧光参数清楚地阐明了LIF在运行中的电力变压器中通过稳定采样来评估不同程度油降解的实时能力。此外,结合流体力学/化学常规测试,FTIR、TGA和UV-PL也支持了实证研究结果。FTIR光谱和热重分析以及其他特征测量强烈表明芳烃的数量增加,并且随着老化时间的推移活化能升高。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
8.40
自引率
11.40%
发文量
1364
审稿时长
40 days
期刊介绍: Spectrochimica Acta, Part A: Molecular and Biomolecular Spectroscopy (SAA) is an interdisciplinary journal which spans from basic to applied aspects of optical spectroscopy in chemistry, medicine, biology, and materials science. The journal publishes original scientific papers that feature high-quality spectroscopic data and analysis. From the broad range of optical spectroscopies, the emphasis is on electronic, vibrational or rotational spectra of molecules, rather than on spectroscopy based on magnetic moments. Criteria for publication in SAA are novelty, uniqueness, and outstanding quality. Routine applications of spectroscopic techniques and computational methods are not appropriate. Topics of particular interest of Spectrochimica Acta Part A include, but are not limited to: Spectroscopy and dynamics of bioanalytical, biomedical, environmental, and atmospheric sciences, Novel experimental techniques or instrumentation for molecular spectroscopy, Novel theoretical and computational methods, Novel applications in photochemistry and photobiology, Novel interpretational approaches as well as advances in data analysis based on electronic or vibrational spectroscopy.
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