242 / 2022-03-14 21:29:35

In situ detection and analysis of dissolved furfural in oil based on Raman spectroscopy

transformer,Aging test,furfural

 Accurate detection of dissolved furfural in transformer oil is one of the keys to judge the aging degree of oil paper insulation equipment. As a non-contact and nondestructive testing method, Raman spectroscopy not only realizes the use of single wavelength laser to detect the dissolved aging features in the insulating oil, but also has the characteristics of fast detection speed and no need for extraction. In this paper , Raman spectroscopy is used to detect the furfural content in insulating oil. The Raman spectra of pure insulating oil, pure furfural and furfural insulating oil solution with concentration of 100 mg/L were detected, and the Raman characteristic 1706 cm^-1 furfural in oil is determined by comparison. In addition, in situ test of different concentration of furfural solution is carried out, and the function relation between the ration of the peak area (I₁₆₁₅/ I₁₇₀₆) and concentration is established. The linear quantitative analysis model is obtained by using the least square method, and the minimum detection concentration can be determined to reach 2.4 mg/L. The results show that laser Raman spectroscopy is an effective and convenient method for transformer aging diagnosis, and has great research value.