The problem of ensuring the reliability of the main equipment of enterprises of the mineral and raw materials complex is considered. The significant influence of automatic control means on the automatic power supply system (object of study) on the efficiency of mining enterprises is shown. Achieving the goal of improving uninterrupted power supply for the operation of electrical installations of the mining complex is ensured by solving the problem of reducing the time of disconnection of damaged areas and transient processes. For this, an algorithm has been developed that uses a set of signs of emergency situations: values of voltages, currents, states of relay protection actuators and automation. In addition, the integration of automatic power supply control and relay protection based on the concept of smart power supply networks of a mining enterprise has been proposed. A sign of identification of the type of emergency mode was by the level of voltage reduction on the buses of the switchgear, control of the actuation of relay protection devices that disconnect equipment in emergency mode, autoreclosing, underfrequency load shedding, automatic reserve entry. MATLAB/Simulink simulated the operation of electrical equipment of the power supply system in accordance with the known method of relay protection and automation, as well as using the proposed algorithm for identifying emergency modes and restoring voltage after disconnection of the damaged area.
The article suggests reflecting the dynamics of evolutionary innovations through time constant of the change in the innovative effect. Such metric numerically equals the period at which the effect of evolutionary innovations changes a fixed number of times. The effect change factor can possess any value suitable for each specific type of the innovative product. The index characterizing the dynamics of the evolutionary innovations -the time constant of the innovative processes effect has been introduced. The effects can be characterized by the improvement in the innovative products properties, the increase in the effectiveness, etc. This index can be applied both to the particular types of the innovative products and to their range, to the innovative development of national and world economies. It allows making compatible innovative processes of different scale.In addition, the time constant of the innovative processes provides the possibility to evaluate and choose the innovations existing in the market according to their compliance with the current dynamics of the innovative development..The suggested index characterizes both particular innovative products and their range.
Abstract. The paper presents instantaneous selective short-circuit protection for the cabling of the underground part of a coal mine and central control algorithms as a Coal-Mine PowerSupply ACS Subsystem. In order to improve the reliability of electricity supply and reduce the mining equipment down-time, a dual channel relay protection and central control system is proposed as a subsystem of the coal-mine power-supply automated control system (PS ACS).
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