Authors: V.M. Efremenko, E.V. Skrebneva, G.M. Lebedev

Title of the article: Analysis of interruptions in the external power supply of coal-fired power plants Kuzbass mines

Year: 2025, Issue: 2, Pages: 22-32

Branch of knowledge: 2.4.2. Electrotechnical complexes and systems (engineering)

Index UDK: 621.3611:621

DOI: 10.26730/1816-4528-2025-2-22-32

Abstract: In the context of the complication of the technological process of coal mining, due to a significant increase in production capacity, the use of conveyor units for coal transportation, as well as the widespread use of control, control and communication tools based on computer technologies, the problem of improving the reliability of the mine's electricity supply is becoming more and more urgent. Power outages lasting more than 0.15 seconds lead to failures of safety monitoring and management systems, communications, activation of electrical protection systems, as well as automatic control systems for coal mining processes. At the same time, it should be noted that the "Safety Rules in Coal Mines" establish the requirements for the manual switching on of electrical installations in underground workings after the operation of any of the electrical protections. That is, it is necessary to find and eliminate the cause of the protection tripping, and only then turn on the electrical installation. All this leads to an increase in the recovery time of the technological process of coal mining and economic damage. However, a power outage does not always lead to catastrophic consequences. Thus, the technological process of coal mining can be interrupted, for example, for preventive or repair work. The same can be said about the preparatory work. It should be noted that the EIR does not have a clear (normative) definition of consumers of the first category, as well as a "special group" of electric receivers in a coal mine. Some consumers who ensure the safety of underground mining (ventilation, drainage) allow some interruption in power supply, determined by their specifics. For example, gas contamination of workings to the maximum permissible concentration does not occur immediately, at the time of shutdown, but after some time, determined by the intensity of gas emission and the volume of workings. Thus, according to the PBUSH clause 147, when switching from the main to the backup (or vice versa), it is allowed to have no ventilation for up to 10 minutes. The permissible interruption in the power supply of dewatering installations is determined by the availability of free volume of water collectors at the time of the interruption in power supply. The main and reliable sources of power supply are power plants and networks of district power systems. The power supply system of the mine is divided into an external supply network and a distribution network on the surface of the mine and underground. This article analyzes the causes and possible time of accidents in the external power supply network of coal mines and suggests a list of measures to reduce the number and time of interruptions in the external power supply of coal mines.

Key words: power supply of coal mines causes of power outages break time

Receiving date: 18.02.2025

Approval date: 01.05.2025

Publication date: 05.06.2025

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