第12卷第4期2023年7月网络新媒体技术Vol.12No.4Jul.2023海底光电复合缆低阻故障点定位方法∗李光炬栾韶泽甘维明刘鹏邢锰(中国科学院声学研究所南海研究站海口570105中国科学院大学北京100049)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≤20km的故障点定位误差均小于150m。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。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DOI:10.20064/j.cnki.2095-347X.2023.04.006LowImpedanceFaultLocationofSubmarinePhotoelectricCompositeCableLIGuangju,LUANShaoze,GANWeiming,LIUPeng,XINGMeng(HainanAcousticsLaboratory,InstituteofAcoustics,ChineseAcademyofSciences,Haikou,570105,China,UniversityofChineseAcademyofSciences,Beijing,100049,China)Abstract:Lowimpedancefaultlocationofsubmarinephotoelectriccompositecableisthekeybasisfortheseafloorobservationnetwork,whichcanrealizelong-term,real-timeandin-situobservationofocean.However,thecomplexoceanenvironmentmakesitdiffi-culttoeffectivelylocatethelowimpedancefaultofsubmarinephotoelectriccompositecable.Therefore,it’scriticaltoquicklyandef-fectivelylocatethelowimpedancefault,whichwillreducethemaintenancecostofsubmarinephotoelectriccompositecableandim-provethetransmissionreliabilityoftheseafloorobservationnetwork.Inthispaper,amonopoleDCtransmissionmodeloftheseafloorobservationnetworkisestablishedbyPSCAD/EMTDC.Thetransientcurrentgeneratedbylowimpedancefaultofsubmarinecableissimulatedandutilizedtolocatethefault.Firstly,theamplitudemu...
