Abstract:In substations of 110kV and below, although the "three layers-one network" architecture simplifies the secondary system wiring, it is difficult to guarantee the real-time performance and reliability. For real-time and reliability under traditional topology cannot achieve the optimal effect of problems at the same time, this paper uses the three layers of a network architecture spider net topology structure, the result of simulation shows that the real-time optimal structure of the communication system, solved the problem of poor real-time performance of traditional topology, and combined with the example verified its feasibility; The reliability of different structures is analyzed by using fault tree analysis method. In order to solve the problem that the traditional fault tree method has some limitations when studying the reliability of complex communication system, this paper introduces T-S fuzzy fault theory and establishes T-S fault tree model. According to the research in this paper, we can get the conclusion that the topology of spider web can improve the real-time performance and reliability of the communication system.