海底光电复合缆低阻故障点定位方法  

Low Impedance Fault Location of Submarine Photoelectric Composite Cable

作　　者：李光炬 栾韶泽 甘维明[1,2] 刘鹏 邢锰[1,2] LI Guangju;LUAN Shaoze;GAN Weiming;LIU Peng;XING Meng(Hainan Acoustics Laboratory,Institute of Acoustics,Chinese Academy of Sciences,Haikou,570105,China;University of Chinese Academy of Sciences,Beijing,100049,China)

机构地区：[1]中国科学院声学研究所南海研究站,海口570105 [2]中国科学院大学,北京100049

出　　处：《网络新媒体技术》2023年第4期42-49,共8页Network New Media Technology

基　　金：海南省重点研发计划项目(编号:ZDYF2020201);中国科学院海洋信息技术创新研究院创新前瞻项目(编号:CXQZ201705)。

摘　　要：海底光电复合缆低阻故障点定位是实现长期、实时、原位观测海洋的海底观测网的关键基础,然而海洋环境的复杂性增加了海底光电复合缆低阻故障点定位的难度,如何快速而有效地定位低阻故障点,对于降低海底光电复合缆维护成本与提高海底观测网输电的可靠性至关重要。该文通过仿真软件PSCAD/EMTDC建立海底观测网单极直流输电模型,利用该模型模拟海缆发生低阻故障时产生的暂态电流定位故障点。首先,采用离散小波变换模极大值提取暂态电流的幅值突变信息,然后通过暂态电流的主频分量计算暂态电流的传播速度,最后由暂态电流的幅值突变信息与传播速度计算出海缆的故障距离。实验结果表明,利用暂态电流可快速、有效定位海缆低阻故障点,在海底光电复合缆故障距离≤20 km的故障点定位误差均小于150 m。可为近岸海底光电复合缆的低阻故障点定位提供一种有效方法。Low impedance fault location of submarine photoelectric composite cable is the key basis for the seafloor observation network,which can realize long-term,real-time and in-situ observation of ocean.However,the complex ocean environment makes it difficult to effectively locate the low impedance fault of submarine photoelectric composite cable.Therefore,it’s critical to quickly and effectively locate the low impedance fault,which will reduce the maintenance cost of submarine photoelectric composite cable and improve the transmission reliability of the seafloor observation network.In this paper,a monopole DC transmission model of the seafloor observation network is established by PSCAD/EMTDC.The transient current generated by low impedance fault of submarine cable is simulated and utilized to locate the fault.Firstly,the amplitude mutation information of transient current is exploited by the discrete wavelet transform modulus maxima.Then,the propagation speed of transient current is calculated by the main frequency component of transient current.Finally,the fault distance is calculated by the amplitude mutation information and propagation speed of transient current.The experimental results demonstrate that low impedance fault of submarine cable can be located quickly and effectively by transient current,and the fault location error is less than 150 m when the fault distance is less than 20 km.This work can provide an effective means for locating the low impedance fault of nearshore submarine photoelectric composite cable.

关 键 词：海底光电复合缆 低阻故障点 暂态电流 离散小波变换模极大值 故障点定位 

分 类 号：TN913.3[电子电信—通信与信息系统]