Abstract:

A lab device was built for testing gassing characteristics of transformer oil under condition of coexisting electric field and temperature, and the relative test method was established. The effect of temperature, electric field strength, base oil composition, and anti-oxidation additives on gassing characteristics was studied. The result show that temperature has a greater influence than electricity field under the coexisting conditions, the gas content increases with the increase of the electric field strength and the aromatic content of the oil tested. Gassing characteristics performance of naphthenic base transformer oil without aromatics was similar to paraffinic base transformer oil; Antioxidant in transformer oil can reduce gas content significantly.

Key words: transformer oil, aromatics, coexisting electric field and temperature, gassing characteristics