Chursinova A. Security facilities reliability prediction and prophylaxis period for cable network ignition prevention of mine.

The power supply system and the coal mine section security facilities are the investigation objects. The aim of the research work is to develop the method of prognostication of the security facilities reliability and terms of measures to prevent mine cable systems ignition. The methods based on probability and reliability theories were applied to achieve the purpose. The analytical research and mathematical modeling are computer made. The application of such investigation methods as Markovian homogeneous process, effects computer modeling, correspondence of the RD 50-690-89 observance data, positive convergence of the results of evaluation of the mine cable system fire safety with the branch statistics data prove the science theses backgrounds, reliability, conclusions and recommendations. The work's novelty lies in the development of mathematical modeling of prognostication of probability of the mine cable system ignition caused by short-circuit current. The structural scheme of possible ignition o f mine cable systems under the short circuits is proposed and substantiated. The analytical and experimental dependency of the possible mine cable systems ignition frequency on the short circuit current occurrence frequency, security facilities reliability, and prevention terms is proposed. The practical importance of the work is in improvement of the calculation methods which makes it possible to evaluate the probability of the mine cable systems ignition under the electric equipment and security facilities operation. The security facilities reliability standards are in the backgrounds. The implementation level. The proposed mathematical models and formulae were used by MakNII for further investigations and at the document called The Method of Evaluation of Safety of Power Supply Systems of Gas Fields, Technology Installations, and Safety Facilities under their Operation. The application of the method under discussion at Krasnilimanskaya Mine made it possible to substantiate the terms of the security fac ilities preventive maintenance under which the standard level of fire safety is provided. The work's results are recommended to be applied by the research institutes of MakNII, UkrNIIVE, NIIGD under the security facilities reconstruction and prognostication of fire safety of the mines cable systems and any other ignition dangerous objects such as nuclear power plants, chemical enterprises, and gasmains.