Gas stability and thermal stability of transformer oils in electric fields

This paper presents analysis into the gas stability and thermal stability of ВГ, ГК, and ТАп transformer oils in a high-tension electric field. These oils differ in terms of purification method, sulfur content, and hydrocarbon-type composition. Experiments indicate a correlation between gasp absorption / gas emission of the studied oils and the content of aromatic hydrocarbons and general sulfur in the same oils. Greater quantity of aromatic hydrocarbons and organosulfur compounds is found to increase gas absorption, which is demonstrated by the ТАп oil sample. Lesser concentration of aromatic hydrocarbons and organosulfur compounds increases the gas emission of the tested ВГ and ГК oils. It is demonstrated that the quantity of aromatic hydrocarbons and organosulfur compounds does affect the generation of gas in these three oil types, as well as the thermal stability of their hydrocarbons to oxidation. Operating properties of transformer oils depend on their gas stability and thermal stability in electric fields.