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Fault propagation analysis of IGBT fault in CRH5 traction system based on signed directed graph

This paper proposes a method using SDG (Signed Directed Graph) to investigate fault propagation mechanism of IGBT faults in traction system of CRH (China Railway High-speed) trains. A TCG (Time Causal Graph) model is obtained from the BG (Bond Graph) model of CRH5 traction system first; then, an SDG model is derived from the TCG model in accordance with fault tree propagation backward derivation. Grey correlation analysis is adopted to compute the probability of fault sources and the propagation probability on the path. Verification results can demonstrate the effectiveness of the proposed method.