Transformer to run in extreme temperatures for a long time what harm

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Oil-immersed transformer, Class A insulation, heat maximum temperature to allow 105 ° C, the average temperature of the winding temperature than the top oil in the transformer operation is higher than 10-15 ° C, that is, when the top oil temperature in the run up to 85-95 ° C actually winding has reached about 105 ℃, if a long run in these extreme temperatures, winding insulation serious aging and accelerate the degradation of insulating oil affect the service life.