New Back-Up Protection Principle and Its Modeling Based on IEC 61850

The traditional protection only uses the information of the places where protection installs to make judgments. This limitation leads to that protection becomes increasingly unsuited to the requirements of the modern grid. This paper proposes a multi-information back-up protection principle that makes use of the corresponding relationship between the fault location and fault output data. The logical model and communication model were established following IEC 61850. The model establishes a multi-information protection logic node and describes the information flow among LNs in the station. Finally, a strategy table was put forward and a logic simulation was set up in PSCAD. Analysis shows that the program can make the protection configuration more flexible and more effective.