Abstract
1. It has been shown experimentally that the hydrocarbons making up petroleum-derived transformer oils (isoparaffinic, naphthenic, naphthenic-aromatic, and aromatic hydrocarbons) are characterized by very low values of tan δ (within the experimental error) at 50 Hz and temperatures from 20 to 125° C. 2. In the process of determining tan δ during prolonged heating to high temperatures (100–125°C), aromatic hydrocarbons from resins, causing an increase in tan δ. This explains the lack of agreement with the data of [1, 3, 4]. 3. When the additive 2, 6-di-tert-butyl-4-methylphenol (ionol) is used in a fraction of monocyclic aromatic hydrocarbons isolated from a transformer oil distillate, it retards the processes of resin formation and the increase in tan δ. A fraction of bicyclic aromatic hydrocarbons has little response to the action of ionol. 4. When aromatic hydrocarbons are diluted with substantial amounts of naphthenes, the tendency of the aromatics toward resin formation during aging under conditions of oxygen “starvation” is decreased sharply, out of proportion to the amount of dilution. This phenomenon can serve as the basis for producing oils that will change little in dielectric properties during service.
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