The heat dissipation of oil depends mainly on the viscosity of the oil and the configuration of the transformer. Reducing the viscosity of oil is of little practical significance to improving the heat dissipation capacity of the equipment, and the heat dissipation area and cooling mode of the transformer have great practical significance to improve the heat dissipation capacity of the transformer.
On the one hand, the transformer oil in the oil immersed transformer can increase the insulation strength between the parts of the transformer, and make the core of the transformer winding cool; on the other hand, the insulation material in the transformer, such as wood and paper, can keep the original chemical and physical properties, so that the metal, such as copper, can be antiseptic. It can also play the role of extinguishing the arc. Therefore, Koh transformer oil plays a major role in heat dissipation, moisture prevention and deterioration prevention.
During the operation of transformer oil, the influence of high temperature and electric field and chemical decomposition will also cause deterioration of oil quality.
Oil may be in contact with air in operation, and the water in the air will damp the oil. The oil after moistening not only reduces the breakdown voltage and the dielectric loss, but also accelerates the oxidation of copper and iron in the transformer, and causes a large amount of sediment in the oil. Generally, oxidized oil is more susceptible to moisture than fresh oil, and the wetting oil is 2~4 times faster than the dry oil.
In addition to the relevant protection measures for the oil in operation, the transformer should also be regularly sampled to monitor the oil quality and ensure the safe operation of the transformer.
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