In view of the current network structure of the Smart Substations in China, the industrial Ethernet is analyzed with respect to the presence of long latency that may be found in the communication of Smart Substation, the configuration complexity that is not conducive to repair and the maintenance involving relatively high economic costs. A connection-oriented switching network technology is then proposed on similar issues, with a leaky bucket model being built up based on the substation information flow. Subsequently, the service classification and priority scheduling mechanism are placed to introduce the network calculus to calculate the delay bound of each of information flows. Conclusively, based on the IEC62439, a network communication method for Smart substation is established to solve the problems with the Industrial Ethernet application in smart substation.

In accordance with the definition of the IEC 61850 standard, a digital substation is hierarchically distributed and divided into the process layer, the spacer layer and the station layer. On the basis of the analysis of its structure and function, this work is focused on the configuration of different layers and that of the dual bus wiring electronic transformer and merged unit, as well as the GOOSE network solution under the relay double configuration.