500 kV充油海底电缆导体温度分布式光纤传感监测及应用

依据海南联网系统500 kV海底电缆捆绑特殊海底光缆的实际情况，通过分布式光纤传感技术结合经有限元仿真模型优化的IEC60287热路模型的方法可以监测海底电缆内部的温度分布。在实验室中搭建岸上模拟实验平台，利用中压电缆捆绑光纤的结构进行捆绑电缆岸上模拟实验。同时，将经验证的温度监测方法应用于海南联网系统500 kV海底电缆，以C相空气段为例监测捆绑电缆光单元的温度。采用有限元仿真计算电缆表面的温度，根据电缆表面的温度基于热路模型推导出对应的导体温度，得到电缆导体在实际运行过程中的温度变化。岸上模拟实验测量的导体温度与数值计算得到导体温度的误差低于1.77%， 验证了海底电缆导体温度监测方法的准确性。

Monitoring of 500 kV Oil-filled Submarine Cable Conductor Temperature with Distributed Optical Fiber Sensing Technology and its Application

According to the actual situation of 500 kV submarine cables bundled with the special submarine optical cables in Hainan Networking System， combined with the IEC60287 thermal circuit model optimized by finite element simulation model， the temperature distribution of the submarine cable can be monitored by distributed optical fiber sensing technology. An onshore simulation experiment platform is set up in the laboratory， and the medium-voltage cable bundled with optical fiber is used for onshore simulation experiment. At the same time， the verified temperature monitoring method is applied to the 500 kV submarine cable in Hainan Networking System. Based on the point at bare air section of the C-phase， the temperature change of the optical unit for bundled optical cable is tested. The finite element simulation is used to calculate the surface temperature of the cable， and then the corresponding conductor temperature is derived by using the thermal circuit model according to the temperature of the cable surface， thus obtaining the temperature change of the cable conductor during actual operation. The error between the conductor temperature measured by both the onshore simulation experiment and numerical calculation is less than 1.77%， verifying the accuracy of the submarine cable conductor temperature monitoring method.