Power System Fault Diagnosis Based on Fault Information System and Forward and Backward Reasoning

In this paper, an approach of power system fault diagnosis based on the fault information system and forward and backward reasoning is presented. From the fault information system, we get the power network topology and the configuration information of protection; we get the set of suspicious faulted equipments according to the operation rules and the operational information of breaker, protective relaying. The method and rules of identifying the faulted equipments by forward and backward reasoning are described in detail. The relation grade between faulted equipments and their protection are described also. Test result shows that the method can reduce processing time and increase accuracy. The method is more able than previous method to adapt to the changing of network configurations and protection configurations. The method is suitable for online applications.