Numerical Calculation of Transient Thermal Characteristics in Gas-Insulated Transmission Lines
Abstract: For further
knowledge of the thermal characteristics in gas-insulated transmission lines
(GILs) installed above ground, a finite-element model of coupling fluid field
and thermal field is established, in which the corresponding assumptions and
boundary conditions are given. Transient
temperature rise processes of the GIL under the conditions of variable ambient
temperature, wind velocity and solar radiation are respectively investigated.
Equivalent of surface convective heat transfer coefficient and heat flux
boundary conditions are updated in the analysis process. Unlike the traditional
finite element method (FEM), the variability of the thermal properties with
temperature is considered. The calculation results are validated by the tests
results reported in the literature. The conclusion provides method and theory
basis for the knowledge of transient temperature rise characteristics of GILs
in open environment.
Keywords: convective heat transfer coefficient, finite element model, heat
flux, open environment, transient temperature rise
Author: Li Hongtao, Shu
Naiqiu, Li Ling Li Ling, Wu Xiaowen
Journal Code: jptkomputergg130066
