暂态负荷下高压直流海底电缆热传递过程

高压直流（HVDC）交联聚乙烯（XLPE）绝缘海底电缆是实现长距离和大容量电能输送的重要设备。HVDC海底电缆负荷影响温度分布，而温度对HVDC XLPE绝缘电导率和电场强度分布特性有重要影响。相对于稳态负荷条件，暂态负荷条件下HVDC海底电缆热传递过程更加复杂。为研究暂态负荷下HVDC海底电缆热传递过程，建立热学有限元模型，仿真分析HVDC海底电缆由零负荷向满负荷再向零负荷转变过程的热传递过程，并组建试验平台开展对比研究。研究结果表明：仿真计算结果和试验测试结果吻合度高，仿真模型适用于描述暂态负荷下HVDC海底电缆热传递过程；通过构建导体温度暂态分量和稳态分量，可以实现良好的导体温度热传递过程趋势拟合，拟合方法有利于指导HVDC海底电缆温度趋势预测和现场运行维护工作。

Heat Transfer Process of HVDC Submarine Cables under Transient Load

High-voltage direct current (HVDC) XLPE submarine cable is an important carrier for long-distance and large-capacity power transmission. The HVDC submarine cable load affects temperature distribution, while the temperature has an important influence on the conductivity and electric field strength distribution characteristics of HVDC XLPE insulation. Compared to the steady-state load conditions, the heat transfer process of HVDC submarine cables under transient load conditions is more complicated. In order to study the heat transfer process of HVDC submarine cables under transient load, this paper establishes a thermal field finite element model, and simulates the heat transfer process of HVDC submarine cables under the working conditions from zero load to full load and then to zero load. In the meantime, a test platform is set up to conduct contrast studies. The results show that the simulation results are in good agreement with the test ones, and the simulation model is suitable for describing the heat transfer process of HVDC submarine cables under transient load. The conductor temperature heat transfer process can be well fitted through constructing the transient and steady state components of conductor temperature, and the fitting method is helpful for temperature trend prediction and field maintenance of HVDC submarine cables.