Abstract
Heat transfer matrix has been provided to calculate the steady state buried power cable core temperature. Considering temperature difference between subsurface and air, variability of soil thermal conductivity and other conditions, it is of great significance to improve the heat transfer matrix to manage the real-time cable current load and improve the operation and maintenance plans of the cables. Finite element method is employed to analyze the temperature field of buried cable with complex environment conditions and the accurate value of cable core temperature with various working conditions can be obtained. Based on the uniqueness and superposition of temperature field, the improved heat transfer matrix for calculating the temperature rise of buried cable core can be established by applying the finite element calculation data. Taking the effect of Solar radiation into account, a comprehensive formula is developed. The core temperatures of buried power cables can be obtained by the established comprehensive formula with complex environment conditions. The practical examples validates that the proposed method has the advantages of simplicity, ease of execution, and faster calculation. This method can be used for the real-time dispatching of cable load by workers and can meet the engineering requirements.
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