基于多场耦合模型的海底电缆载流量和温度场计算研究

海底电缆将电能输送至陆上升压站过程中,各路径段敷设方式下其载流量和温升都对其输送稳定性有着重要影响,电缆载流量和温度场的准确计算对提升电能输送的可靠性与经济性都有着重要意义。文章结合电缆敷设条件,利用COMSOL有限元分析软件建立了基于电磁场、流体场和传热场的多物理场耦合模型,分析了电缆沟内敷设电缆的温度场变化,研究了不同敷设方式对电缆载流量大小的影响。数据表明,电缆敷设的位置和回路数会对电缆载流量产生影响,不规范的敷设位置和密集的回路数都会降低载流量值。因此在工程中应严格按照规范敷设电缆,同时确定适当的回路数以提升运行经济性。

Calculation of Temperature Distribution and Ampacity for Submarine Cables Based on Multi-physics Field Coupling Model

When submarine cable transmits electricity to onshore step-up stations,the ampacity and temperature rises of cable have close relationship with reliability in each path section laying mode,the accurate computation of the ampacity of conduit cable and distribution of temperature field has significance for the reliable and economical operation of power grid.This article combined with cable laying condition,With the use of COMSOL multi-physics software,this paper built a multiple physical field coupling model based on electromagnetic field, fluid field and heat transfer field,which simulates ampacity and temperature distribution.The simulation results show that the cable ampacity relies on the concentration degree of cable bundle,and irregular laying positions and overly dense loops can reduce the ampacity.Therefore,it is necessary to follow the procedures requirements to lay cable bundles and determine the appropriate number of loops,which can enhance operational economical efficiency.