A Novel Criterion for Determination of the Process Bus Structure to Connect Primary Equipment to the Automation System Based on IEC

In substation automation system, the appropriate operation of protection, control and monitoring systems depends on connection network accuracy. One of the important topics in modern automation system is connection of primary equipment to automation system by serial network; this connection is named ‘process bus’. Generally the configuration of communication network is based on the required data, reliability and commissioning requirements during the installation of the automation system. It is clear that the reliability and security of the communication networks are different respect to their importance. Therefore, the significance of the substation can be used as a criterion to determine bus configuration. In this paper, some significance indices are introduced for determination significance level of substations, and then communication structures of the process bus are determined.