高电压技术2011，Vol.37Issue(4)：1002-1007,6.
排管敷设电缆群暂态温度场和短时载流量数值计算
Numerical Calculation of Transient Temperature Field and Sort-term Ampaticty of Group of Cables in Ducts
摘要
Abstract
In order to reasonably adjust short-time load of power cables, it is very important to calculate transient temperature field and short-time ampacity of underground power cables in ducts with high accuracy. Transient conduction equations and natural convection equations of simulation model were presented. The calculation process of transient temperature of underground power cables in ducts was divided into discrete transient time step using the finite difference method (FDM). At each time step, finite element method (FEM) was used to calculate the steady-state temperature distribution of underground power cables in ducts. The variation equations of natural convection were established by the vorticity-stream function and Galerkin method. Coupling of natural convection and conduction and radiation was realized by the iteration method. Between adjacent two time-steps, Grank-Nicolson difference formula was used to transfer parameters and conditions. At last, the temperature variation in whole time and the final transient temperature distribution of underground power cables in ducts were presented. The permitted short-term ampacity of underground power cables in ducts was calculated by iteration approach. Trial and simulation of underground heat pipes in ducts was used to verify underground power cables in ducts. The trial test results are the same as the simulation results. The comparison proves that FDM with FEM possesses a high accuracy in calculating the transient temperature field and short-term ampacity of underground cables in ducts, and presents a new effective method to calculate short-time ampacity in engineering.关键词
排管/电缆群/暂态温度场/有限差分法(FDM)/有限元法(FEM)/短时载流Key words
duct/ group of cables/ transient temperature field/ finite difference method(FDM)/ finite element meth-od (FEM)/ ampacity分类
信息技术与安全科学引用本文复制引用
梁永春,闫彩红,赵静,孙克军,刘建业..排管敷设电缆群暂态温度场和短时载流量数值计算 [J].高电压技术,2011,37(4):1002-1007,6.基金项目
河北省自然科学基金(E2009000719). （E2009000719）
