One liquid bucks that trend, though, and can contribute greatly to the longevity of certain circuits: oil. Dielectric oil cools and insulates everything from the big mains transformers on the pole ...

has detected slow oil leaks from two transformers ... in the lining of cooling unit tubing, Henrickson said. The PCB levels in the spilled oil appear to be below federal water quality standards ...

The electrical, mechanical, and physical requirements of oil-immersed single-phase and three-phase converter transformers are specified in the standard. IEEE is offering its Standard for General ...