Short-circuit fault diagnosis and interval location method for constant current remote supply system in cabled underwater information networks

The short-circuit fault status of constant current remote supply system was diagnosed by analyzing the directional matrix of the current flow direction and the mean error value. Fault intervals were located by calculating the change of mean error values of current in trunk before and after the fault in Laplace transform domain. Isolate the short-circuit fault to maintain normal operation of the rest of the system, thus improving the reliability of cabled underwater information networks. According to the established typical ring topology constant current remote supply system circuit model, the fault location scheme was designed to simulate the short-circuit faults of the primary nodes and the trunk cable sections in the constant current remote supply system, and to analyze the change of current located at the primary nodes in the Laplace transform domain before and after the fault. Results show that the current of each primary node changes in the Laplace transform domain when the system has a short-circuit fault. The fault interval can be analyzed and located by comparing the difference in current change before and after the fault. The designed method of short-circuit fault diagnosis and interval location for constant current remote supply system has high feasibility and practicability, which is suitable for the short-circuit fault monitoring and judgement of cabled underwater information networks in the future. © 2019, Zhejiang University Press. All right reserved.