Intelligent approach to coordination identification in distance relaying

摘要

Proper coordination of the protective relays is one of the important conditions for power system security. Settings of distance relays usually determined by heuristic rules may not satisfy the coordination requirements. In this paper, the coordination behaviour of the setting rules of the distance relays is investigated. Coordination conditions and properties are derived and the coordination region is introduced. Efficient algorithms to identify the coordination status are presented together with its test results.