A new knowledge expression method is given by analyzing , summarizing setting principles of relay protection . it improves the application level of relay protection software . the system is built up with c / s model , which solves the problems involving multiple users and data share 通過對電力系統(tǒng)繼電保護及其整定原則的分析、總結、抽象,設計實現(xiàn)了一套完整開放的知識建立、知識表達方法,提高了整定計算軟件的實用化水平。