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The reclamation of insulating oils, including reconditioning, re-refining, and inhibiting, is of growing importance to power system operators. Recent developments in a long-studied power system maintenance program have furnished the basis for a new concept of the operating characteristics of insulating oils. The new concept is that insulating oils, when properly serviced, can be given practically unlimited extension of life free from the formation of sludge or excessive acidity due to oxidation even in free-breathing transformers. In view of this situation it is felt that this symposium will show that an entirely new trend of thought is now in order and that some of the ASTM standards may need to be reviewed because they are based on the old concept that insulating oils inherently wear out and must be discarded because of acidity and sludge caused by oxidation. To develop the subject, discussed briefly are the background, the necessary terminology, and the problems involved and the developments of importance to their solution. This general treatment of the subject has been followed by a more detailed description of modern maintenance methods, including the tests available and their significance, the various means for reclaiming oil, the effects of inhibition, and the principles upon which an oil maintenance program is based.
Doble, Frank C.
President, Doble Engineering Co., Belmont, Mass.