Abstract
The method presented by theoretical calculations for estimating the residual resource of possible on and off switches by high-voltage circuit breakers is proposed based on the switching resource utilization factor and an integral indicator of the technical condition of gas-free circuit breakers. The calculations were performed in relation to the passport data by the manufacturer. They show the relationship between the deterioration of the technical condition of the equipment with an increase in the probability of failures and a decrease in the reliability of the protective function of power systems. The results obtained can be used in making operational decisions and planning maintenance of high-voltage circuit breakers with an insulating environment – gas. The results of calculations of dependent indicators are illustrated in the form of graphs. The calculations performed demonstrate the influence of key diagnostic parameters on the remaining life of electrical equipment.