In order to overcome the shortcomings of traditional methods for corrosive sulfur detection in transformer oil, Raman spectroscopy based detection is proposed in this paper. The widely concerned corrosive sulfur, Dibenzyl Disulfide (DBDS), was chosen as the characteristic molecule to be detected. A series of oil samples with different DBDS concentrations was prepared. And these samples were extracted by 1-methyl-2-pyrrolidinone for DBDS enrichment to improve the sensitivity of detection. Then Raman spectra of samples were obtained, and a linear model was established by analysing the relationship between the characteristic peak and the DBDS concentration. The limit of detection reached 7.98 mg/kg. For determining the DBDS concentrations causing sulfur corrosion, the sulfur weight content on the copper conductor surface was measured by Scanning Electron Microscope-Energy Dispersive Spectrometer after a corrosion test. The results show that the corrosion limitation highly depends on the type of transformer oil, and the Raman spectroscopy detection can meet the limit of detection requirement in practical condition. Finally, an on-site oil sample and five Lab-made samples were detected via our new method and the current Gas Chromatography-Mass Spectrometry based method. It is found that there is no significant divergence between the measurement results. And good applicability was also demonstrated in on-site sample test.

中文翻译：

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基于拉曼光谱的变压器油中腐蚀性硫的检测：方法与应用

为了克服变压器油中腐蚀性硫的传统检测方法的不足，本文提出了基于拉曼光谱的检测方法。选择广泛关注的腐蚀性硫二苄基二硫化物（DBDS）作为待检测的特征分子。制备了一系列具有不同 DBDS 浓度的油样。并用1-甲基-2-吡咯烷酮提取这些样品进行DBDS富集以提高检测的灵敏度。然后得到样品的拉曼光谱，通过分析特征峰与DBDS浓度的关系建立线性模型。检出限达到7.98 mg/kg。为了确定引起硫腐蚀的 DBDS 浓度，腐蚀试验后，用扫描电镜-能谱仪测定铜导体表面硫重量含量。结果表明，腐蚀极限高度依赖于变压器油的种类，拉曼光谱检测可以满足实际条件下的检测极限要求。最后，通过我们的新方法和当前基于气相色谱-质谱的方法检测了一个现场油样和五个实验室制造的样品。发现测量结果之间没有显着差异。并且在现场样品测试中也证明了良好的适用性。拉曼光谱检测可以满足实际条件下的检测限度要求。最后，通过我们的新方法和当前基于气相色谱-质谱的方法检测了一个现场油样和五个实验室制造的样品。发现测量结果之间没有显着差异。并且在现场样品测试中也证明了良好的适用性。拉曼光谱检测可以满足实际条件下的检测限度要求。最后，通过我们的新方法和当前基于气相色谱-质谱的方法检测了一个现场油样和五个实验室制造的样品。发现测量结果之间没有显着差异。并且在现场样品测试中也证明了良好的适用性。