In recent years, with the development of the economy, S11-oil-immersed transformers are commonly used by enterprises and institutions. To ensure the normal operation of S11-oil-immersed transformers, daily maintenance of the transformers is required. Today we will take a look at S11- Precautions for transformer oil in oil-immersed transformers. Generally speaking, there is no specific time limit for replacing transformer oil, and some can be used for more than 20 years. When changing transformer oil, it mainly depends on the condition of the oil during operation.

Transformer oil plays the role of insulation and heat dissipation in the transformer. Transformer oil is mineral oil. Due to its different compositions, if different transformer oils are mixed together, it will affect the stability of the oil and accelerate the deterioration of the oil quality. Therefore, different transformer oils are different. Models of transformer oil generally should not be mixed. If oils of the same type have to be mixed and used when there is insufficient oil, they should undergo an oil mixing test, that is, chemical and physical tests must be conducted to prove that they can be mixed, and then mixed for use. Before filling the transformer with oil, you should always check the sealing of the oil-filled equipment, the working performance of the oil conservator and breather (moisture absorber), and whether the oil color and oil quantity are normal.

According to the testing specifications of transformer oil, the transformer oil in operation must be tested for oil quality analysis every once in a while. Based on the results of the test analysis or the operating status, it is considered whether the transformer oil needs to be replaced. According to the service life of the transformer, through the latest comprehensive analysis of the transformer oil insulation resistance, absorption ratio, polarization index, dielectric loss, winding leakage current, trace water in the oil, etc., we can comprehensively judge the moisture, impurities, oil aging, etc. If it is not qualified, continue to use it after filtering and regeneration. If it is inconvenient to filter and regenerate under special circumstances, you can also consider replacing the transformer oil with new one.