Optimized Design and Research of Fault Line Selection Device for Indirect Grounding System Based on RTDS

In indirect-grounding system, the accuracy of fault line selection device is significant to ensure safety of both system operation and operator. To improve such accuracy, research and design of post-acceleration and tripping-switching strategies had been brought out, optimizing function of fault line selection. In this paper, the anticipated design of simulation models had been developed in RTDS closed-loop system with practical fault line selection device. Also, such design was successfully verified by testing according to various items. It is safe to draw the conclusion that the new strategy could effectively optimize functions of fault line selection device, so as its accuracy.