Integrated Protection Testing Method for Intelligent Substation Based on Security Risk Isolation Technology

A Security Risk Isolation (SRI) technology based integrated protection testing method for intelligent substations (IS) is proposed to address the limitations of point-to-point testing and high data security risks in traditional protection testing methods. Firstly, the testing measures of IS and its Relay Protection Device (RPD) were analyzed, and based on this, the current problems were deeply analyzed. Then, the necessity of conducting SRI during relay protection testing was analyzed, and a system SRI scheme was constructed. Finally, a protection testing method based on SRI technology is proposed based on this scheme combined with maintenance of dedicated switches. The proposed method was compared and analyzed with the other two methods through actual on-site testing. The results showed that the proposed method had the shortest testing time in the work containing 3, 5, 8, and 10 RPDs to be tested, which were 3.5 hours, 4.2 hours, 4.5 hours, and 5 hours, respectively. And during the testing process, the proposed method has the longest safety time and performs better than the other two comparative methods.