海缆有限元温度场的实验研究与模型验证

Experimental Research and Model Validation of Finite Element Temperature Field of Submarine Cable

在海缆监测的实际工程中,无法对海缆中导体的温度进行直接测量。采用布里渊光时域分析仪测量海缆内部光纤的温度,并利用有限元方法得到海缆的温度场模型,两相结合推导出导体温度。为验证有限元模型的正确性,将一段海缆置于水中模拟海缆的实际工作状态并进行通电加热,记录光纤的温升曲线。实验得到的温升曲线与有限元模型得到的温升曲线高度重合。实验结果表明海缆温度场模型具有较高准确度,适合实际的工程应用。

In the actual project of submarine cable monitoring, it is impossible to directly measure the temperature of the conductor in the submarine cable. The temperature of the optical fiber inside the submarine cable was measured using a Brillouin optical time domain analyzer, and the temperature field model of the submarine cable was obtained by the finite element method. The two phases were combined to derive the conductor temperature. In order to verify the correctness of the finite element model, a section of the submarine cable was placed in water to simulate the actual working state of the submarine cable and was heated by electricity, and the temperature rise curve of the optical fiber was recorded. The temperature rise curve obtained experimentally coincides with the temperature rise curve obtained by the finite element model. The experimental results show that the submarine cable temperature field model has high accuracy and is suitable for practical engineering applications.