Transformer fault diagnosis is the foundation of equipment maintenance in power system. Analysis and judgment of the collection of data which is acquired by condition monitoring on the working process of transformer could conclude and reflect some abnormal trend and circumstance while accompanying the change of actual working situation. In this paper, we design and apply the method of expert system based on fuzzy evaluation theory for the dilemma which diagnose transformer fault both accurately and efficiently. It sets up an expert knowledge representation applicable to feather and working situation of transformer and a rule-matching method in knowledge application. It maximizes the function of the expertise knowledge and experience, and shows a acceptable accuracy and a high performance.
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