With the development of unattended substation, design of centralized control station automation system has gradually formed an operation management pattern of power grids, which has been growing emphasis on the promotion and application of electricity enterprise.

Loop Ethernet-networking mode for distributed substation automation system;

： Combined with the NSC substation automation system，the application and implementation of communication，GPS，VQC and other techniques are studied in this paper．Based on the Taihe and Tongji 220 kV substation construction in Shanghai China，the paper proposes their project diagrams and the problems met in engineering process and the solution for them are discussed in detail

By introducing the applied engineering sample in the field of the pumping station automatization,this paper indicates that the design engineer often ignore the problem: if the software programming is based on Ethernet,then the corresponding PLC type will configure the Ethernet interface,otherwise it is very difficult that the long-distance monitoring system effectively execute the instructions.