Mining College, National University of Science and Technology – MISIS, Moscow, Russia:

L. A. Plashchansky, Professor, Candidate of Engineering Sciences, pla3768@yandex.ru

The power-supply systems in modern mines are the complex multi-branch hierarchies, composed of very many intermediate switching, transforming and converting terminals and facilities, various voltage networks and common and special mine equipment. Reliability of a mine power-supply system depends on the pool of all elements of the system – from a power source to an energy consumer. Considering dynamism of a power net and its topology variability, it is advisable to analyze individual reliabilities of stationary elements and branches of a power-supply system with due regard to their interrelationship. Reliability of energy consumers is evaluated with the consumers divided into two groups. The first group is the consumers whose power supply failure can induce an industrial disaster; reliability of the second group consumers is evaluated with respect to the related damage rate. Although a system may be composed of the equally reliable elements, breakdowns of different elements may result in functional losses of unequal consequences. Such complex systems are evaluated using the method of weight coefficients. For multi-branch power-supply systems, it is crucial to obtain a quantitative estimate of the whole system efficiency at an early design stage in order to find the required reliability levels for individual sub-systems. Aspiration to ensure the maximum reliability of the complex multi-functional systems is based on the fact that failures of electric equipment minimize economic efficiency due to underproduction, elevated repair expenses, re-setting and maintenance. On the other hand, an unlimited increase in reliability will greatly increase the cost of a power-supply system. For these reasons, it is important to ensure the technologically sound level of the power-supply system reliability with a view to minimizing the system design, construction and operation costs. Such a multi-functional system should be energy-efficient to ensure reliable operation under any possible modes at the wanted quality of electric power; thus, this system cannot be assessed with the failure probability and needs to account for economic lossеs. The quality of such complex systems can be evaluated using an index of effectiveness.

1. Aleksandrovskaya L. N., Afanasev A. P., Lisov A. A. Modern methods of provision of reliability of complex engineering systems. Moscow : Logos, 2001. 206 p.
2. Kharlov A. N. Electromagnetic compatibility in electrical power engineering. Tomsk : Rosenergoservis, 2007. 118 p.
3. Anishchenko B. A., Kolosova I. V. Basis of reliability of electrical supply systems. Minsk : Belorus National Technical University, 2007. 150 p.
4. Vasileva T. N. Reliability of electrical equipment and electrical supply systems. Moscow : Goryachaya liniya – Telekom, 2015. 152 p.
5. Yong Liu, Singh C. Reliability Evaluation of Composite Power Systems Using Markov Cut Set Method. IEEE Transactions. Power Systems. 2010. Vol. 25, No. 2. pp. 777–785.
6. Plashchanskiy L. A. Estimation of power supply systems efficiency with a branched structure for high performance mines. Vestnik vysshikh uchebnykh zavedeniy Chernozemya. 2015. No. 2. pp. 11–13.
7. Nazarychev A. N., Zhulina T. A. Electrical Eguipment Maintainability at Electric Power Stations and Substations. Vestnik IGEU. 2009. Iss. 2. pp. 91–96.
8. Kuznetsov P. A. On the analysis of the effectiveness of fully redundantsystems. Vestnik SibGAU. 2015. Vol. 16, No. 2. pp. 326–330.
9. Lukutkin B. V., Vaynshteyn R. A. Khrushchev Yu. V. Increasing of reliability and quality of electric supply of consumers. Izvestiya Tomskogo politekhnicheskogo universiteta. Inzhiniring georesursov. 2013. Vol. 306, No. 1. pp. 144–148.
10. Guskov A. V., Milevskiy K. E. Reliability of engineering systems and anthropogenic risks : tutorial. Novosibirsk : Novosibirsk State Technical University, 2007. 427 p.
11. Plashchanskiy L. A., Artyukh I. V. Investigation of structural reliability of underground electric subbly schemes. Izvestiya vuzov. Gornyy zhurnal. 1988. No. 7.
12. Klyatis L. M. Accelerated Reliability and Durability Testing Technology. New Jersey : John Wiley & Sons, 2012. 430 p.
13. Ustinov D. A., Baburin S. V. Synthesis Procedure of the Power Supply Systems Topology at Mineral Resource Enterprises bastd on Logical-Probabilistic Assessments. International Journal Applied Engineering Research. 2016. Vol. 11, Nо. 9. pp. 6402–6406.