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Maintenance of electrical leads to a deterioration of the dielectric properties of high-voltage isolation and failure, so the role of preventive methods of monitoring of electrical insulation condition increases.To determine the remaining life of the cable and effectively determine the location of damage to the cable line (CL) on the need to use non-destructive test method. Relevance of the work is to develop a method for the continuous monitoring of electrical insulation with sufficient technical and economic efficiency. The purpose of the investigation is to improve the reliability of the electrical insulation of power equipment.

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Abstract. Methods of calculation of thermal processes of the isolating materials are considered, in problems of nondestructive diagnostics of the main and distributive power stations. Theoretical justification of calculation of thermal processes of the multilayered isolating structure was given. On the basis of the analysis of results of operation, service life, physical processes of "ageing" and use of diagnostic parameters of the isolating structure characteristics of resistance of the equipment to refusal are offered. Time of refusal and a residual service life allow to predict using of dependences of refusal resistance. IntroductionTemperature is one of the major factors defining wear and destruction of the isolating materials, power stations. If temperature becomes nearer to the most admissible, begins process of intensive thermal wear of the isolating material, its thermal aging. As a result can occur thermal breakdown of the isolating material. Factors of environment and electromagnetic processes complicate a task of the analysis of the thermal modes, from the point of view of heating engineers, on some orders.