多回路、不同电压等级电缆隧道电磁-热-流多物理场耦合仿真

Electromagnetic-Thermal-Flow Multi-Physics Field Coupling Simulation of Multi-Loop and Different Voltage Grade Cable Tunnel

摘要: 与普通直埋电缆、排管电缆等敷设相比，多回路不同电压等级电缆隧道敷设电缆的温度场计算相对较复杂。本文基于ANSYS有限元仿真软件，建立多回路电缆隧道电磁-热-流多物理场耦合模型，研究不同电压等级内电缆电场分布、温度场分布特性规律，并采用解析法对不同电压等级电缆电场分布进行了验证。结果表明：110 kV、220 kV、500 kV电缆绝缘最大场强分别为13.18/17.95/32.67 kV/cm；采用“一”字型敷设时，中间相电缆温度较两侧相高，采用“品”字型敷设时，其A相电缆导体温度较BC两相高。论文工作可为多回路不同电压等级电缆隧道敷设电缆载流量的计算提供参考。

Abstract: Compared with the laying of ordinary direct buried cables and drainage cables, the calculation of temperature field of cable laying in cable tunnels with different voltage grades in multiple circuits is relatively complicated. This paper, based on ANSYS finite element simulation software, estab-lishes a multi-loop cable tunnel electromagnetic-heat-flow multi-physical field coupling model, studies the characteristics of electric field distribution and temperature field distribution in cables with different voltage levels, and verifies the electric field distribution of cables with different volt-age levels with analytical method. The results show that the maximum insulation field strength of 110 kV, 220 kV and 500 kV cables is 13.18/17.95/32.67 kV/cm respectively. When the “line” shape is adopted, the temperature of the intermediate phase cable is higher than that of the two sides. When the “triangle” shape is adopted, the temperature of the A phase cable conductor is higher than B and C phases. The work of this paper can provide reference for the calculation of cable car-rying capacity in cable tunnel laying with different voltage levels in multiple circuits.