Fault Diagnosis Expert System Based On Fault Tree For Transformation Equipment

Because of the important state of the equipment of substation in power system, it is very necessary to process condition monitoring and fault diagnostic to gain high operating reliability.Fault Mode Analysis (FMEA) method is introduced and improved to meet the needs of fault diagnosis. The mode of system definition from two aspects (structure and function), and the items, such as'fault symptom'and'fault cause'enhance the assistance for fault diagnosis. Fault tree is applied to describe the causal relation of substation equipment faults. During the establishment of fault tree, a method based on FMEA is presented to strengthen the objectivity of tree.The paper introduces the knowledge-express method of rule-based and framework form expert system。The hybrid reasoning strategy fused by the rule-based reasoning and fault tree reasoning is used to meet the request of equipment diagnosis. The function that the system realizes mainly includes: knowledge base maintenance and modification, diagnosis database importing and scanning, equipment fault diagnosing function, printing report. It can solve the real problems intelligently and practically.