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电力电缆线路运行温度在线检测技术是目前及时发现电力电缆线路局部过热点位置、检测运行线路的绝缘状态和计算导体载流量的首选技术措施。分布式光纤拉曼测温技术是利用激光在光纤中的传播特性,实现实时测量空间温度场分布的新技术,可以对光纤沿线的温度场进行分布式的连续检测。介绍了光纤拉曼传感技术的测温原理,以及基于此技术的电力电缆温度在线监测系统在实际中的应用,获得了一些仿真结果,并同传统的测温技术进行了详细的比较,说明分布式光纤拉曼测温系统应用于电力电缆在线监测的优势,适合于推广使用。
The on-line detection technology of power cable line temperature is the preferred technical measure to find the location of hot spot in power cable line, detect the insulation status of running line and calculate the current carrying capacity. Distributed fiber Raman temperature measurement technology is a new technology that realizes the real-time measurement of spatial temperature field distribution by utilizing the propagation characteristics of laser in optical fiber. It can carry out distributed and continuous detection of temperature field along optical fiber. This paper introduces the principle of temperature measurement of fiber Raman sensor technology and the application of online monitoring system of power cable temperature based on this technology. Some simulation results are obtained and compared with the traditional temperature measurement technology in detail Distributed optical fiber Raman temperature measurement system used in power cable online monitoring advantages, suitable for promoting the use.