Abstract:Transformer oil chromatographic detection is one of the important techniques for state evaluation of oil filled equipment. The trace deviation of the measured data will lead to the misjudgment of the state of equipment. Based on the chromatographic data in 2022 compared among 35 laboratories, and combined with the experimental spectra, the possible causes for the deviation of transformer oil chromatographic data are briefly analyzed from environment information input deviation, aging equipment parts and test details in the process of chromatographic detection. Finally, some suggestions are proposed for instrument maintenance and test control in chromatographic detection.