Abstract
This article deals with the implementation of diagnostics and monitoring of the current-conducting part and insulation state of high-voltage cable lines in real time using digital twins. The problems of thermal accounting and the fea-tures of modeling electrothermal heating processes in power cables are determined. A mathematical electrothermal model of a power cable for a cable line digital twin is proposed, based on the decomposition of its dynamic thermal resistance in-to the sum of exponential components, which makes it possible to calculate the instantaneous values of the heating temper-ature of a current-conducting cable core in real time with insignificant amounts of calculations on the discretization interval of the calculation. The results of calculation using the heating temperature model for a single-core power cable with a three-phase short circuit in the network are presented.
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