Yakimishina V. Development of methods of calculation of reliability of structurally-difficult charts of power supply systems taking into account three types of refusals of electrical equipment

Research object is system of supply by electric energy 10-0,38 kV industrial enterprises, him electrical equipment and facilities of defence from the currents of short circuit. Research purpose is improvement of method of calculations of reliability of structurally-difficult charts of the systems of supply by electric energy 10-0,38 kV and exposure of measures and facilities which allow to promote vitality of knots of loading. Researches were conducted with the use of methods of theory of homogeneous markovskykh casual processes with the discrete number of the states and continuous time; theories of reliability; probability theories. New mathematical models are developed and analytical dependences which allow to forecast vitality of knot of loading and produce estimation of reliability of the system of supply by electric energy are got. Analytical dependences of loss of vitality of knot of loading on frequency of appearance of currents of short circuit in the area of action of relay defence, reliability of the system of disconnection of protective commutation vehicle, system of automatic input of reserve and terms of their technical service are first offered. The method of estimation of reliability of the systems of supply by electric energy is developed 10-0,38 kV taking into account three types of refusals of electrical equipment; method of estimation of vitality of knots of loading of industrial enterprise; the norms of reliability on the systems of disconnection of protective commutation vehicles are grounded, system of including of sectional switches together with the system of automatic input of reserve and terms of their technical service, which the rationed level of vitality of knot of loading is provided at. The developed mathematical models and methods of calculations were used by a research institute on safety of works in mining industry for estimation of fire safety underground cable networks 6 kV, by service of main engineering specialist of mine power by him. Kalynyna at estimation of vitality of main substation and UkrNYYVE at the ground of norms of reliability on the system of disconnection of complete distributive device 6 кВ. Materials of theoretical and methodical developments are used in the educational process of the Donetskyi national technical university. Area of use - power industry.