Study of Probability Characteristics of the Reliability of Electrical Equipment in Internal Power Supply Systems

Industrial power supply facilities have in their composition technological cycles of varying degrees of complexity and the corresponding electrical equipment of intrashop power supply systems. The aim of the study: to determine laws of change in probabilistic reliability characteristics of low-voltage electrical equipment, namely circuit breakers, magnetic starters, contactors and power transformers on the basis of statistical data on operation. To determine the laws of changes in reliability parameters of electrical equipment of power supply systems, we conduct a study of theoretical and statistical functions of the probability of no-failure operation and the probability of failure for each type of the investigated electrical equipment. The normal law of distribution was adopted for the study. The conformity of probability characteristics of electrical equipment to the normal distribution law was checked using Kolmogorov and Pearson criteria.