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Self-healing materials are an essential emerging class of smart materials, capable of repairing their damage after external stimuli, especially mechanical damages. However, the lack of studies on self-healing polymers after electrical breakdown is highly important for electrical engineering and electronics. We propose to use a nickel­(II)-2,6-pyridinedicarboxamide-co-polydimethylsiloxane complex (NiPyPDMS) as an electrical breakdown protective material. To provide the absence of dust deposition from ambient air and to increase durability, we fabricated multilayered polymer “sandwiches” consisting of a NiPyPDMS layer covered with two films (polypropylene (PP) or polydimethylsiloxane (PDMS)) on both sides. Multilayered PP-NiPyPDMS-PP and PDMS-NiPyPDMS-PDMS films exhibit autonomous self-healing properties (up to 75%) after electrical breakdown at room temperature. NiPyPDMS demonstrates 3.7 times higher adhesion to copper, from which power lines are made, compared to PDMS. NiPyPDMS also exhibits antistatic and redox properties (NiII/NiIII transformations when electricity is applied). All characteristics mentioned above lead to reduce the probability of electrical breakdown via electrical charge dissipation in self-healing coating on possible power lines.

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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