高压直流电缆终端载流量确定方法

The Determination Method of Steady-State Current-Carrying Capacity of HVDC Cable Terminal

高压直流电缆终端载流量与其稳态温度分布之间存在密切联系,为了研究载流量的准确计算问题,提出了一种基于迭代方法和ANSYS仿真软件的高压直流电缆终端载流量确定方法,以线芯最高长期允许温度和XLPE绝缘层、硅橡胶绝缘层径向最大允许温差作为限流条件;通过对比分析了未使用迭代方法和使用迭代方法时载流量的决定因素(线芯最高允许温度和XLPE绝缘层最大温差)随线芯载流变化情况,以及终端绝缘限制最大温差和终端最外层绝缘温度变化对其载流量的影响。研究结果表明:采取该方法进行载流量计算是必要且可行的。

Determination of steady-state current-carrying capacity of HVDC cable terminals is closely related to its steady temperature field distribution. In order to calculate current-carrying capacity accurately, based on iterative algorithm and ANSYS simulation software, a calculation method of current-carrying capacity of HVDC cable terminals is proposed taking maximum temperature of cable core and maximum temperature gradients of XLPE and rubber insulation as criteria of current limit. Relationships between carried current and maximum allowable temperature of core and maximum temperature gradient of XLPE insulation are comparatively studied via applying and not applying iterative algorithm. Experimental results show that iterative algorithm is more accurate to calculate current-carrying capacity. This paper provides a valuable reference for calculation of current-carrying capacity for HVDC cable terminals.