关键词: 分路电流幅值包络, 多分辨奇异值分解, 断裂点

Abstract: To detect the exact fracture point of railway, a model of short-current amplitude envelope of cab is constructed based on transmission line theory when rail line occurres fracture, and the influence of fracture on short-current amplitude envelope is analyzed in this paper. Then the exact fracture point is detected by using characteristics of Multi-Resolution Singular Value Decomposition（MRSVD） detail signal of short-current amplitude envelope. Experiment results show that the proposed method can accurately detect the location of fracture point under different fracture equivalent impedances, and make up the shortage of current methods. Because of the analysis data are directly from the cab signal recorder and additional devices is not needed, the proposed method remedies the defects of existing detecting methods in respect of detecting costs and timeliness.

Key words: shunt-circuit currents amplitude envelope, Multi-Resolution Singular Value Decomposition（MRSVD）, fracture point