中国电机工程学报2025，Vol.45Issue(4)：1623-1631,中插33,10.DOI:10.13334/j.0258-8013.pcsee.232453
基于混合调制的海底直流电缆故障定位方法
Fault Location Method for Submarine DC Cable Based on Mixed Modulation
摘要
Abstract
In recent years,long-term power failure accidents of submarine DC cables have occurred frequently due to damage factors such as seawater erosion and anchor damage,posing a serious threat to the safe and stable operation of underwater transmission systems.It is of great significance to locate the fault source quickly and accurately for improving the reliability of cable insulation.However,the existing spread spectrum time-domain reflection method has low testing efficiency and accuracy due to its limited ranging range constrained by symbol duration.Therefore,this paper proposes a mixed modulation method,which multiplies m sequences with different symbol durations and modulates them through binary phase shift keying using a sine signal,resulting in a mixed frequency signal rich in fault information.This method can realize wide range ranging and improve the testing efficiency and accuracy.Through model derivation and experimental verification,a submarine cable break fault is simulated and studied for location.The results show that the period of the m sequence is proportional to the ranging range,while the duration of the symbol is positively correlated with the blind spot of the ranging.Based on this,modulation experiments are carried out on m sequences with symbol durations of 1μs and 0.1 μs.The results show that the ranging range is extended from 3 141 m and 314.1 m to 3 235.23 m,respectively,and the ranging blind spot is further reduced.Therefore,using the mixed modulation method proposed in this paper can effectively overcome the drawbacks of existing methods and greatly improve the efficiency and accuracy of submarine cable fault location.关键词
混合调制/电缆故障检测/扩展频谱时域反射法/海底直流电缆Key words
mixed modulation/cable fault detection/spread spectrum time domain reflectometry(SSTDR)/submarine DC cable分类
动力与电气工程引用本文复制引用
白龙雷,范道平,罗博,游江,马泽军,李靖德,邹亮..基于混合调制的海底直流电缆故障定位方法[J].中国电机工程学报,2025,45(4):1623-1631,中插33,10.基金项目
国家自然科学基金项目(52307006) （52307006）
烟台市重大创新科技项目(2023ZDCX015). Project Supported by National Natural Science Foundation of China(52307006) （2023ZDCX015）
Major Innovative Science and Technology Projects in Yantai(2023ZDCX015). （2023ZDCX015）
