Development of Calculation Methodology of Thermal Equivalent Circuit’s Parameters for Predicting Temperature of High Voltage Cable Lines 110 - 500 kV

This paper is concerned with the development of techniques to the calculation of the thermal equivalent circuit parameters for the high-voltage cable line laid in the ground. The topology of the scheme was developed in author’s previous publication. This article discusses the parameters of the circuit which simulate the environment of the cable line. Calculation techniques of these parameters are described for cables laid in a plane and a trefoil pattern. The proposed scheme allows one to predict heating of cables on the day ahead in order to prevent thermal degradation of the insulation.