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Power transformer is one of the most important equipments in the electric system. Dissolved Gases Analysis is
an important method in the diagnosis of internal fault of transformers. Because the signs and types of fault have
complicated nonlinear relations, the traditional methods cannot exactly meet the requirements of engineer application.
This paper proposes synthesis of relational grey incidence to analyze the comparability and the proximity of the sequence
which can effectively diagnose the type of transformer faults.