Research on Transformer Inter-turn Fault Protection Method Based on Innovation Graph

Once the transformer fails, itwill bring blackouts to the power network. The existing protectionmethods are difficult to detect and locate faults. This paper analyzes the electrical characteristics of inter-turn short circuit of dual-winding transformer, discusses the possibility of on-line monitoring of inter-turn short circuit by innovation graph, and proposes an inter-turn protection method based on current ratio innovation. When the innovation value of current ratio exceeds the threshold value, the fault can be judged and the protection action can be protected. This method can avoid the transient process of transformer, and is not affected by inter-phase fault and external fault, which improves the reliability of the protection algorithm. The feasibility of the proposed protection algorithm is verified by simulation experiments.