Life assessment of TUK and Nomex-910 impregnated mineral transformer oils using Raman spectroscopy

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON) Pub Date : 2017-11-01 DOI:10.1109/CATCON.2017.8280218

C. Ranga, A. Chandel

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引用次数: 3

Abstract

Concentration of furfural (Furan-2-carbaldehyde) in transformer oils is a well-known indicator for thermal degradation in oil-paper insulation. The application of Raman spectroscopy to determine thermal deterioration as a function of Furfural concentration can overcome many disadvantages of traditional detection methods and accelerated testing. In the present paper, thermal stability of thermally upgraded Kraft (TUK) and Nomex-910 impregnated mineral transformer oils has been investigated at higher accelerated thermal stresses. Samples having a standard mass ratio of oil and paper insulations in accordance with IEEE Std. C57.154-2012 have been studied. These samples were thermally stressed at 120°C and 150°C. Subsequently, the aged samples were analyzed using Raman spectroscopy test. Furfural was characterized by Raman signal at 1705.69 cm−1, where no spectral interferences caused by oil-derived Raman signals occur. It has been observed from the test results that the oil sample consisting of TUK has higher life than that of the Nomex-910 immersed oil sample. It indicates that the Furfural formation in TUK test samples is more as compared to its Nomex-910 counterpart. Hence the degradation rate of TUK oil samples is more at higher temperatures. Consequently, Nomex-910 has been found more suitable for high temperature applications than TUK.

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用拉曼光谱评价TUK和Nomex-910浸渍矿物变压器油的寿命

变压器油中糠醛(呋喃-2-乙醛)的浓度是油纸绝缘热降解的一个众所周知的指标。利用拉曼光谱测定糠醛浓度的热劣化特性，克服了传统检测方法和加速检测方法的诸多缺点。本文研究了热升级Kraft (TUK)和Nomex-910浸渍矿物变压器油在较高加速热应力下的热稳定性。根据IEEE标准C57.154-2012，研究了具有标准质量比的油和纸绝缘样品。这些样品在120°C和150°C下进行热应力处理。随后，对老化样品进行拉曼光谱分析。在1705.69 cm−1处用拉曼信号表征糠醛，没有油源拉曼信号引起的光谱干扰。从试验结果可以看出，由TUK组成的油样比Nomex-910浸入式油样具有更高的寿命。这表明TUK测试样品中的糠醛形成比其对应的Nomex-910更多。因此，在较高的温度下，TUK油样品的降解率更高。因此，Nomex-910被发现比TUK更适合高温应用。

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

2017 3rd International Conference on Condition Assessment Techniques in Electrical Systems (CATCON)

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