Transformer oil plays a role in strengthening insulation, heat dissipation, corrosion protection and arc extinguishing in the transformer. Due to the high quality requirements of transformer oil, strictly speaking, it is difficult to explain whether the transformer oil is qualified without the withstand voltage test and simplified test. However, after long-term practice, it is clear that the qualification of the transformer oil can be judged by the first and second.
A smell. It is by smelling the smell to identify whether the transformer oil is qualified or not. The quality of the transformer oil should be odorless, or slightly scented with kerosene; if there is another odor, the oil quality is deteriorated. For example, if the transformer oil has an acetylene taste, an arc is generated in the oil; if the transformer oil has a sour taste, the oil is seriously aged.
Second look. The first is to look at the color of the transformer oil. The new transformer oil is generally light yellow and will change color after oxidation. The darkness of the new transformer oil is not allowed. The color of the new transformer oil in operation is rapidly darkened, indicating that the oil quality has deteriorated. The second is to look at the transparency of the transformer oil. The new transformer oil is transparent in the glass bottle with blue-violet fluorescence. If it loses fluorescence or is no longer transparent, it means that there is free carbon and mechanical impurities in the transformer oil.
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