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Power transformer fault diagnosis based on extension theory

Based on extension theory and conventional DGA (dissolved gas analysis) three-ratio method, this paper proposes an extension theory based power transformer fault diagnosing method. Extension theory tries to solve contradictions and incompatibility problems, its theoretical pillars are matter element theory and extension set theory. This paper first briefly introduces the basic concept of matter element theory, establishes the matter element models for three-ratio method, after briefly discusses extension set theory, detailed analysis is carried out on the extended relation function (ERF) adopted in this paper for transformer fault diagnosis. The detailed diagnosing steps are offered. Simulation proves that the proposed method can overcome the drawbacks of the conventional three-ratio method, such as no matching and failure to diagnose multi-fault. It enhances diagnosing accuracy