Transformer life extension through proper reinhibiting and preservation of the oil insulation

The authors discuss the preservation of insulating systems in transformers (oil as well as solid insulation). Emphasis is placed on life extension of a power transformer by recognizing the degradation of the insulating system and detailing the methods used to measure aging and the processes to accomplish preservation. These techniques apply to both new transformers and in-service units. Data from the literature and some of the authors´ studies are presented