Comparison Of Methods Of Calculation Of The Electrical System Of In-Plant Power Supply

The proposed article is devoted to the study of reliability of operation of electrical equipment of low-voltage shop-floor network schemes. With the development of digitalization in industry and energy, the use of new technological processes and the introduction of new types of equipment, the requirements for the reliability of in-plant power supply systems are becoming more stringent. The paper presents methods for assessing the reliability of electrical equipment in the shop-floor power supply systems on the example of the scheme of a section of the shop network, including the main elements - power transformer, low-voltage cable lines, distribution points, circuit breakers, magnetic starters, contactors, switches. Reliability parameters of the scheme are calculated with respect to each connection; with respect to the power distribution cabinet (SHRs) and power distribution point (PRs). The considered methods are recommended to use for specification of periodicity and terms of maintenance and repair of electrical equipment of the system of intra-workshop power supply, and also for analysis of reliability of work and revealing of the least reliable sections of schemes of networks. The algorithm of calculation with the use of logical-probabilistic method by means of construction of a tree of failures for an estimation of frequency of power loss of SHRs and PRs, and also separate connections is presented. Graphical dependences of probability of failure-free operation and occurrence of failure in time for the studied schemes are shown.