Transformer oil quality identification method - Database & Sql Blog Articles

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Transformer oil plays a crucial role in enhancing insulation, dissipating heat, preventing corrosion, and extinguishing electrical arcs within transformers. Due to the high standards required for transformer oil, it's generally difficult to determine its quality without conducting a withstand voltage test or a simplified analysis. However, through long-term practical experience, it has become clear that the quality of transformer oil can often be assessed through two simple methods: smell and visual inspection.

The first method is to use your sense of smell. High-quality transformer oil should be odorless or have a slight kerosene-like scent. If you detect any other unusual odors, such as an acetylene-like smell, it may indicate that an arc has occurred in the oil. A sour or burnt smell suggests severe aging of the oil, which could compromise its performance and safety.

The second method involves visual inspection. First, check the color of the oil. New transformer oil is typically light yellow, and it tends to darken when oxidized. If the oil appears dark right from the start, it might not be of good quality. In operation, if the oil rapidly turns dark, it’s a sign that the oil is deteriorating. Second, examine the transparency of the oil. Fresh transformer oil is usually transparent with a blue-violet fluorescence when viewed in a glass bottle. If the fluorescence fades or the oil becomes cloudy, it indicates the presence of free carbon or mechanical impurities, both of which are signs of contamination or degradation.

In summary, while laboratory testing is the most accurate way to assess transformer oil quality, using smell and visual inspection can provide quick and effective initial evaluations. These methods are especially useful in field settings where immediate decisions are needed to ensure the safe and efficient operation of electrical equipment.