Abstract
For the transformer overheating fault diagnosis based on extenics, this paper proposes the extension diagnosis method that uses the matter element having all the characteristics and piecewise linearization correlation function. The method ensures the consistency of each overheating fault characteristics and overcomes the limitation of elementary correlation function in the infinite interval. The simulation result with 20 groups of overheating fault of which type is known shows that the proposed method overcomes the improved three-ratio method’s defects that multiple overheating fault can’t be diagnosed and the diagnosis precision isn’t high. Better diagnosis effect is obtained.
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