Since the decomposition rate of the organic materials in a transformer is influenced by temperature, a significant change in ambient conditions will impact transformer life and the ability to overload the transformer safely. The hot spot temperature, which relates to aging, i.e. expected life time, depends on ambient temperature and the load. So if ambient temperature increases, to maintain lifetime the load has to be decreased accordingly. If the transformer is moved to a lower ambient temperature, consideration needs to be made with regard to the insulating fluid and its properties to handle very low ambient temperatures.
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