An application of expert system to equipment operation of 500 kV substation

An intelligent approach to generating switching sequences for the 500 kV Shuanglong substation is presented. A method for developing a practical expert system is presented, which uses the technologies of facility modeling, network topology, SCADA information, special expert knowledge database, hierarchical inference engine and so on. To solve the main problem of "state recognition" and "state change", an online network topology analysis algorithm is used to replace an inefficient special rule. So the proposed expert system has high intelligence and a good recognition ability of the run mode of the facility. The node-model and bus-model for the primary device and the incident-model for the secondary device are created. The real time SCADA information is utilized. A multi-production system is used to implement the knowledge expression for the expert system. Having designed an explanation engine, the inference process and the used rules can be explained in detail. The system has been used at the 500 kV Shuanglong substation, Jinhua, Zhejiang, since May 1999.