Research of thermal stability of the VG transformer oil in the presence of individual sulfides

In connection with the known negative impact of organosulfur connections on quality of transformer oils and the corresponding rise in price of their production including various ways of cleaning of oil fractions of organosulfur connections re-searches of structural and group structure of oil organosulfur connections and their influence on operational properties of transformer oil have been conducted. Influence of individual sulfides on thermal stability of the brand VG transformer oil in electric field is studied by tension of 30 kV/cm at change of concentration of sulfides in range from 0 to 1,0% from the mass of oil. The research was con-ducted with use of methylbenzylsulfide and a metilfenilsulfide on the basis of the brand VG transformer oil without addition of an ionol. It is established that individual sulfides metilbenzil- and metilfenilsulfide treat the anti-oxidizing additives reducing oil aging speed. For obtaining the maximum thermal stability of transformer oil the optimum concentration of individual sulfides making 0,5% of the mass of oil is defined...