The analysis of high voltage coal-mine distribution networks has been carried out to build up the equivalent circuit in order to study the ground fault processes under different conditions. The current distribution-based evaluation of protective relay functionality has revealed a strong impact of the network topology, length of cables, continuous variation in the network parameters on the efficiency of protective relays. The increase in the distributions network reliability can by achieved through involving the information exchange between the network nodes in the process of relay decision making.
The study analyzes the existing algorithms of automation of substations of oilfield sites and solves the problem of ensuring the first category of power supply of oilfield sites. The algorithm of the automatic reserve input scheme operation for uninterrupted power supply at oilfield sites was developed, based on which the secondary switching circuit of the complete switchgear (CSD) was designed. Modeling of the algorithm was performed by means of logic blocks in Simulink environment of MATLAB system.
Reliability and efficiency of electrical equipment depends on the quality of electrical energy in distribution networks. The key issue of power quality assurance is the problem of higher harmonics. The problem arose due to the widespread introduction of power electronics as the most effective means of ensuring the required modes of operation of electromechanical and electrotechnological complexes. In this paper the influence of higher harmonics on the power quality is analyzed by means of MATLAB Simulink system, the principle of parallel active filter based on the algorithm of direct current control is considered.
