Stability of Electrical-Insulating Oils-Part II: Significance of Aging Behavior

The purpose of this paper is to interpret the experimental results presented earlier under the same subject on gassing characteristics of the oils, on the effects of copper catalyst and electrical stress on electrical deterioration, and on ways and means to preserve electrical-insulating oils from contamination and deterioration. The effects of the presence of a copper catalyst and electrical stress have been carefully examined, the most nonreactive gas for oil quality preservation is pinpointed, the fundamentals of gassing behavior are clarified, and the probable mechanism of oil deterioration under the various atmospheric gases is discussed. With the conclusions clearly pointing out what to expect and what to avoid in the treatment and use of electrical-insulating oils, it is hoped that some contribution to this knowledge has been rendered in a small way.