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In this paper, on the basis of analysis of the characteristics of the power system fault , fully consider a variety of factors in the actual running state and fault analysis algorithm of an expert system - based , fuzzy theory , supplemented by in-depth study . First, the key technologies introduced system , detailed analysis of the principles and methods of substation fault diagnosis expert system and fuzzy theory and introduces the basic principles . And analysis of research , analysis and simulation of substation fault diagnosis system , including: the overall architecture of the building , the expert system knowledge base the module knowledge representation and database building , fuzzy inference to improve the uncertainties in the information . Finally, this system simulation applications .
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