基于分布式布里渊光纤散射传感的海底动力电缆监测技术研究

针对海底动力电缆出现故障而寻找电缆监测的技术与方法，分析渤海湾不稳定海域的海底动力电缆多次出现短路和断路故障的原因与机理，提出基于布里渊散射原理的分布式光纤传感技术监测电缆所受外力变化和监测电缆内部温度变化的方案和方法，进行三相高压电缆截面温度场和电缆外部受力变形的数值模拟分析，通过室内模拟实验和海堤沉降段电缆敷设后的光纤传感监测数据及水准仪观测监测数据对比分析，得出光纤传感器检测数据趋势与水准仪器测量结果吻合。模拟和现场测试结果表明，基于光纤布里渊散射原理的分布式光纤传感技术可有效实现海底动力电缆的温度和变形监测。

Technological Study on Distributed Brillouin Fiber Sensor Monitoring of High Voltage Power Cable in Seabed

Short circuit or broken circuit of submarine power cable happened several times in the Bohai sea of China. In order to find possible technology and approach of seabed cable fault detection, distributed Brillouin optical fiber sensing technology was used to detect inner temperature and outside strain of submarine power cable. Temperature field of on-line three phase cable section and cable strain from outside were mathematically simulated by finite element method. Different temperature testing field and strain testing field in submarine power cable specimen could be shown by distributed simultaneous strain and temperature sensor device. The field monitoring data from optical fiber sensor system and traditional leveling observation were given comparatively. Experimental results show that distributed Brillouin optical fiber sensing technology is elementally effective and reliable for the temperature and strain of submarine power cable monitoring.