ENSURING THE TROUBLE-FREE STATE OF COAL MINES IN CASE OF INTERRUPTIONS IN POWER SUPPLY FROM THE POWER SYSTEM

The presence of consumers of the first category in terms of uninterrupted power supply in coal mines, including consumers of a special group, ensuring the safe stay of people in underground workings, requires a high level of reliability of power supply to mines from centralized sources. According to the Rules for the Installation of Electrical Installations (EIR), the consumers of electricity of the first category in coal mines include the main and auxiliary ventilation units, the main (in some cases the sectional) drainage, and the human lift. Electricity supply of this category must be carried out from two independent redundant sources of electricity supply. The same requirement is contained in the Decree of the Government of the Russian Federation dated 27.12.2004 No 861 (as amended on 30.01.2021). Both documents require that the time of restoration of power supply does not exceed the time of operation of the automatic switching on of automatic transfer switch (ATS) devices. According to GOST IEC 62040-3-2009, consumers of a special group include electric receivers of the critical category (ECC), the uninterrupted operation of which can be disrupted with a duration of more than one period of industrial frequency. Such electric receivers at the mine include: devices for automated processing of production, management and financial information, systems for monitoring the state of the mine atmosphere, monitoring the presence and presence of workers underground, communication and warning devices, devices for automated control of technological processes and others. The legal requirement for the availability of an autonomous source of power supply at enterprises requires the development of a methodology for determining their capacity. At present, a large number of scientific works are devoted to the development of methods and algorithms for the selection and justification of the use of an autonomous power supply source at industrial enterprises, but there are no practical approaches to the implementation of autonomous power supply to large coal-fired enterprises with a large amount of reserved capacity. Using the example of a coal mine, the general principles of selecting the capacity of the nuclear power source are considered, which make it possible to formulate the general principles for selecting the capacity of autonomous power supply sources (RES) of consumers of coal mines in conditions of a complete interruption of power supply from the power system. The article proposes one of the options for ensuring the trouble-free state of the mine in the event of an interruption in the power supply from the power system.