Abstract
The paper presents a mathematical model of heat transfer in the underground cable system. The computations were performed for flat formation of power cables buried in the ground at a depth of 2 meters. The model allows determining the two-dimensional temperature distribution in the soil, thermal backfill and power cables. The simulations studied the effect of soil thermal conductivity on the maximum temperature of the cable conductor. Furthermore, the effect of thermal backfill soil conductivity on the cable conductor temperature was studied. Numerical analyses were performed based on a program written in MATLAB.
Highlights
When designing the underground electricity network, the thermal phenomena shall be considered
This study presents a numerical model of underground power cable system
The numerical code developed in MATLAB software allows calculating the two-dimensional temperature distribution within the underground power cable system including cable core, thermal backfill, and soil
Summary
When designing the underground electricity network, the thermal phenomena shall be considered. Al-Saud et al [2] performed the numerical computations of temperature distribution in soil and underground power cables. The authors developed the new numerical model of coupled liquid water, vapor and heat flow in a thermal system that consists of underground cable buried in the soil. The transient computations performed using the Finite Element Method were verified experimentally and demonstrated the strong relation of the cable temperature on soil water content. The optimization of thermal backfill dimensions was presented in [6,7], and the computational studies of multilayered soil effect [8] and various cable placement type [9,10] were performed. The numerical code developed in MATLAB software allows calculating the two-dimensional temperature distribution within the underground power cable system including cable core, thermal backfill, and soil. The presented mathematical model is efficient and straightforward in programming implementation
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