缆系水下信息网恒流远供系统短路故障诊断及区间定位方法

通过分析电流流向的有向矩阵变化和平均误差值，诊断恒流远供系统短路故障状态；计算故障前、后干线电流在拉普拉斯变换域内变化的平均误差值，判定短路故障区间；隔离短路故障段以维护恒流远供系统其余部分正常运作，提高缆系水下信息网络的可靠性. 根据所建立的经典环形拓扑结构恒流模型设计故障定位方案，仿真恒流远供系统中主节点和干线海缆段的短路故障，分析故障前、后各节点处电流在拉普拉斯变换域内的变化. 结果显示，当系统出现短路故障时，各节点电流在拉普拉斯变换域内发生变换，通过对比故障前、后电流变化差值可以分析出故障区间。所设计的恒流远供系统短路故障诊断及区间定位方案具有较高的可行性和实用性，适用于未来水下信息网络的短路故障监测判定.

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.