E l e c t r i c P e r D i v i s i o n DeperhRnt of E l e c t r i c a l Engineering 42, 28th October Str., Athens 106 82, Greece Aktrut A n expert system, f o r substation f a u l t diagnosis and alarm prFessing developed by the E l e c t r i c Power Systems Labofatby o f the National Technical University o f Athens i s presented. I t i s w r i t t e n i n TURBO PROLOG and i s implemented on a personal computer. The expert system indudes many characteristics of an expert system c e l l because i t ccin be expanded e a s i l y by adding new information t o i t s knowledge base or by changing the existing information. The basic idea behind t h i s expert 0885-89~/91/04oO-0648$0 1 . W 1991 IEEE
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