Method of drying a moisture-absorbing material in an air treatment unit for oil-isolated transformers, coils or switches controls heating to when no air flows into their expansion units

摘要

A method of drying a moisture-absorbing material in an air-treatment unit for oil-isolated transformers, throttle coils or switches comprises heating the material only when corresponding time windows can be determined in a given time frame during which a temperature gradient is positive or zero. Thus the heating only operates if no air flows into the interior of the expansion piece of the transformer.