Abstract
The aim of this study was to investigate the distributions of typical metal occurrence in the transformer oil. By the help of the successive extraction method, the distributions of typical metal occurrence in the oil were compared between the normal transformer and incipient fault transformer. The experimental results showed that the successive extraction method could be used to track and detect the typical metals in transformer oil. Compared with the normal transformer, the concentration and fluctuation range of typical metals in the incipient fault transformer was higher and larger, respectively. It was found that the Fe extracted by organic solvent, the Cu and Zn extracted by water were closely related to the fault early warning of the transformer.
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