Future trends of substation automation system by applying IEC 61850

Substation automation systems (SAS) consist of intelligent electronic devices (IEDs) and the communication networks between them, for implementing control, protection and monitoring tasks in power system. Rectitude of this system depends on integrity and interoperability of its components, especially in the case of applying various IEDs from different manufacturer of substation automation system and it is possible by flexible and common protocol in various manufacturers IEDs. For this purpose and in order to interoperability between different manufacturers IEDs, international standard IEC 61850 has been prepared. In this paper the advantages and effects of applying IEC 61850 on SAS performance have been studied and the future modern SAS have been compared to conventional substation automation system.