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Understanding the influence of ambience on thermal ageing of natural ester liquid

机译：了解环境对天然酯液体热老化的影响

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摘要

Ambience during thermal ageing of ester liquid has a high impact on corona inception voltage (CIV) under AC and DC voltages. The CIV is high with ester liquid thermally aged in nitrogen ambience and is the least with air aged. CIV is high under negative DC voltage followed by positive DC and AC voltages. CIV reduces with increase in harmonic voltage and the reduction is predominant with harmonic voltages with higher total harmonic distortions. Corona activity radiates ultra-high-frequency (UHF) signal with its dominant frequency at 1 GHz. Phase-resolved partial discharge analysis carried out using UHF signal indicates that corona discharges occur at the peak of the voltage waveform. The magnitude of discharges is less in thermally aged liquid but the number of discharges increases. Fourier transform infrared spectroscopy analysis indicates the formation of carbonaceous particles with thermal ageing. Thermal ageing of ester liquid causes to form new chromophoric moieties causing red shift of absorption band in ultraviolet-visible spectra. Fluorescence spectroscopy traces the characteristic variations due to thermal ageing, which can be adopted for condition monitoring.
机译：酯液热老化过程中的气氛对交流和直流电压下的电晕起始电压（CIV）有很大影响。在氮气氛下热老化的酯液体的CIV高，而空气老化的CIV最小。在负DC电压之后跟随正DC和AC电压，CIV较高。 CIV随着谐波电压的增加而降低，而降低的主要原因是总谐波失真更高的谐波电压。电晕活动辐射其主频为1 GHz的超高频（UHF）信号。使用UHF信号进行的相分辨局部放电分析表明，电晕放电发生在电压波形的峰值处。在热老化的液体中，排出的量较小，但是排出的数量增加。傅里叶变换红外光谱分析表明，随着时间的流逝，碳质颗粒的形成。酯液体的热老化会导致形成新的发色部分，从而导致紫外可见光谱中的吸收带发生红移。荧光光谱跟踪由于热老化引起的特性变化，可将其用于状态监测。

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  • 来源
    《Science, Measurement & Technology, IET》 |2019年第2期|123-130|共8页
  • 作者

    Thakur Soumya; Panigrahi Suraj Kumar; Mishra A. K.; Sarathi Ramanujam;

  • 作者单位

    Indian Inst Technol Madras, Dept Elect Engn, Chennai 600036, Tamil Nadu, India;

    Indian Inst Technol Madras, Dept Chem, Chennai 600036, Tamil Nadu, India;

    Indian Inst Technol Madras, Dept Chem, Chennai 600036, Tamil Nadu, India;

    Indian Inst Technol Madras, Dept Elect Engn, Chennai 600036, Tamil Nadu, India;

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