As the main transmission equipment of electric energy, cable is one of the key electric facilities to build stable and efficient power network. In recent years, ± 800kV high-voltage DC cable buffer layer erosion accidents, this paper launches the real-time monitoring research on the status of the cable. By analyzing the structure of the cable buffer layer and fault characteristics, the research foundation is laid. Then, the linear tensile test of the strain relationship between the high-voltage DC cable and the sensing fiber, as well as theoretical analysis, to establish the strain relationship between the high-voltage DC cable and the sensing fiber. Then the strain measured by the distributed fiber optic sensing technology is used to calculate the strain of the HVDC cable body and realize the monitoring of the HVDC cable. At the same time, the finite element method is used to establish the cable monitoring model and complete the strain calculation. In the K-fold cross validation, the average accuracy of the cable monitoring model based on distributed fiber optic sensing is 92.4% and relatively stable, with strong generalization ability as well as stability.
