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With the long-term operation of transformers, microorganisms will be produced in transformer oil, and the microbial metabolites can affect the quality of transformer oil. In this paper, the changes of the content, composition, and structure of extracellular polymeric substances (EPS) produced by microorganisms in the transformer oil were analyzed by using three-dimensional fluorescence spectroscopy (3D-EEM), ultraviolet spectroscopy, and Fourier transform infrared spectroscopy (FTIR). The types of organic compounds in new oil and fault oil were compared and analyzed, and the effect of EPS on the quality of transformer oil was investigated. The results show that C=C and C=O characteristic functional groups generate in the transformer oil after long-term operation. The color of the oil in darkened, and the absorbance increases significantly in the near ultraviolet region with the wave length of 190 nm-400 nm. The content of protein (PN) in new oil, running oil, and fault oil is always higher than that of polysaccharide (PS), and PN is the main component of EPS. The number of fluorescent emission contour rings of EPS in fault oil decreases, mainly including O-H, C-H, C=O and unsaturated bond. Compared with new oil, the water content of faulty oil increases by up to 5 times, and the acid value is 40 times higher than that of new oil.
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| 科 Family | 属数 Number of genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) | 属 Genus | 种数 Number of species | 占总种数比例 Percentage of total species (%) |
|---|---|---|---|---|---|---|
| 鹅膏菌科Amanitaceae | 2 | 11 | 5.26 | 鹅膏菌属 Amanita | 10 | 4.78 |
| 小菇科 Mycenaceae | 2 | 12 | 5.74 | 丝盖伞属 Inocybe | 5 | 2.39 |
| 多孔菌科 Polyporaceae | 8 | 14 | 6.70 | 蜡蘑属 Laccaria | 5 | 2.39 |
| 红菇科 Russulaceae | 3 | 23 | 11.00 | 小皮伞属 Marasmius | 6 | 2.87 |
| 小菇属 Mycena | 11 | 5.26 | ||||
| 光柄菇属 Pluteus | 5 | 2.39 | ||||
| 红菇属 Russula | 17 | 8.13 | ||||
| 栓菌属 Trametes | 5 | 2.39 |
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