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The presence of antioxidant is the key factor in controlling the oxidation of an insulating oil. Any monitoring program set up t o keep track of its concentration could result in substantial savings by prolonging the oil service life and slowing down the transformer aging process. This paper describes a method for measuring the amount of the antioxidant 2,g-di-tertbutyl-para-cresol (DBPC) in new or service-aged insulating oils by high-performance liquid chromatography (HPLC) using a Hamilton PRP-1 column (10 pm) and an ultraviolet detector (283 nm). The mobile phase is a mixture of acetonitrile-water (97.5/2.5, v/v) with a flow rate of 1 cm3/min. The byproducts from DBPC, oil oxidation and oil components, whose retention time in HPLC is identical to that of DBPC, were eliminated by filtering the oil on a Sep-Pak Classic silica cartridge. The proposed method has a detection limit of 2.0 ppm and a precision better than 1.7%.

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