Abstract
For further knowledge of the thermal characteristics in g as- i nsulated t ransmission l ines (GILs) installed above ground , a finite-element model of coupling fluid field and thermal field i s established , in which t he corresponding assumptions and boundary conditions ar e given. Transient temperature rise processes of the GIL under the conditions of v ariable ambient temperature, wind velocity and solar radiation are respectively investigated . E quivalent of surface convecti ve heat transfer coefficient and heat flux boundary conditions a re updated i n the analysis process. Unlike the traditional finite element method (FEM), the variability of the thermal properties with temperature is considered. The calculation results ar e 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 .
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