Protection Relay and Fault Information Analyzing System for Smart Grid

For smart grid, the fault information from protection relays and fault recorders is useful for dispatchers to identify the grid fault and resume the power supply fleetly when a fault occurs. Traditionally, EMS/SCADA doesn't have the ability to collect the fault information. An application of protection relay and fault information analyzing system is proposed. In order to implement smarter analyzing functions, three approaches are adopted. First, the system unifies IEC61850 and IEC103 for modeling. Second, an analyzing method of relay characteristic is proposed to evaluate the action behavior of protection relays. Finally, the paper presents an approach to replay the actual action sequence with relay's logic diagram. The system has been carried out and the paper concludes that the system is effective and useful for dispatchers and relay operators in smart grid.