Abstract:

The effect of aromatic content on the oxidation stability of naphthenic base transformer oils with different carbon type compositions were detected using high pressure differential calorimeter scans (PDSC) and NB/SH/0811 method. The experimental results show that for transformer oils with anti-oxidant, the deeper the refining depth and the lower the aromatic content, the better the anti-oxidant sensitivity, also the better the oxidation stability. But in order to balance the dissolved performance and oxidation resistance after hydrotreatment, and to have a better anti-oxidation after the consumption of anti-oxidant, it is necessary to keep a certain refining depth and contain a certain amount of aromatic hydrocarbons for hydrotreated oils.

Key words: transformer oil, oxidation stability, carbon type composition