Abstract
The continuous or steady state rating of buried cables is traditionally determined using the methods described in the IEC standards to calculate the current based on the thermal resistance of the layers between the conductor and the ground surface and are based on the condition that the ground surface is an isotherm. This study demonstrates methods to determine the temperature rise in buried cables considering the earth as a non-isothermal surface due to convection heat loss as well as cyclic variation due to solar radiation using Finite Element Analysis simulations. The results indicate that if the convection heat loss and solar radiation is simulated in a transient nature a very moderate increase in the cable temperature can be expected as compared to the temperature with the surface considered an isotherm.
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