The development of electronics, information technology, machines, robotics, apparatus and all kinds of machine tools with numerical control currently sets high requirements for the power supply of industrial enterprises [1]. It is not possible to ensure the required categorization of power supply everywhere; this issue is especially acute in rural areas. In modern conditions, power grid companies will have to make a new qualitative transition to improve the reliability and quality of services provided.
The results of research on the study of failure statistics and parameters of the main operational factors affecting the damage of electric gas pumping units of the main gas transport are presented. It is shown that the greatest number of failures of technological installations is associated with an electrical breakdown of the insulation in the grooved part of the stator winding of a high-voltage AC electric motor. Objective facts confirming the significant influence of partial discharges in the high-voltage insulation of a synchronous motor on the durability and damage parameters in static and dynamic modes are presented. Recommendations for increasing the service life of drive motors and improving their energy efficiency at compressor stations are proposed.
The results of research on the justification of the energy indicators of the transportation operation of electric traction locomotives without stops and with stops on a virtual flat section of the railway are presented. To achieve the set research goal, traction calculations were performed, based on the developed mathematical models of driving freight trains by one of the electric traction locomotives, the basis of which was the well-known differential equation of train movement, the solution of which was carried out by the graphical method. The research results are obtained in the form of tabular data, graphical dependencies and regression equations designed to determine the main indicators of the transportation work of electric traction locomotives on virtual and, identical to them, real flat sections of the railway and are recommended for implementation in the practice of the work of specialists of the locomotive complex of Uzbek railways.
Today, solar electricity is widely used in remote areas where there is no centralized power supply, or for supplying electricity to homes, offices and other buildings in places where there is a centralized power supply network. The work is devoted to optimizing and increasing the efficiency of using solar panels due to the method of tracking the maximum power point. The analysis of the problem of using this method is carried out. The article provides a formula for calculating the power curve of the solar module. The reliability of the obtained result is confirmed on the basis of functional analysis.
In this article, a study was conducted in the power supply system of the mechanical workshop of CJSC Sibgazstroydetal, in accordance with the requirements of GOST 30804.4.7–2013 standard and in accordance with the measurement program. The method of processing the research results obtained during the experiment is described. All electricity quality indicators are processed using computer programs created in the Labview graphical programming environment. The analysis of electric energy quality indicators according to the requirements of GOST 32144-2013 was performed, according to the results of which conductive low-frequency electromagnetic interference was detected in the 0.4 kV electrical network by the coefficient of the nth harmonic components of the voltage. The obtained values of the electric energy quality indicators characterizing the coefficient of the nth harmonic components of the voltage confirm the need to use technical means to reduce the influence of higher harmonics on electric networks.
The article considers the evaluation of a method based on connecting an additional capacitance to one of the phases to determine the parameters of phase isolation relative to the ground of networks with an isolated neutral voltage of 6 kV in the MATLAB/ SIMULINK software environment by indirect methods. The results of the study of the influence of various factors on the accuracy of measurements of the insulation resistance parameters of the network phases relative to the ground are presented.
The article considers the level of insulation of a number of distribution electric networks with a voltage of 6–10 kV in the Republic of Tajikistan. The insulation parameters relative to the ground were determined by calculation on the basis of methods developed at the Department of "Life Safety" of the South Ural State University. The data obtained is necessary for choosing a security tool and evaluating the level of security.
The article provides a brief reference on the history of the development of the electric power industry in Tajikistan. It is shown that in many remote mountainous areas, the connection of household consumers, villages with a small population, is either economically impractical or impossible at all due to the complex mountainous terrain that does not allow to conduct a power line. Structural schemes for the construction of small and micro-hydroelectric power plants are presented, based on the analysis of which it is concluded that they need to be simplified by reducing the number of functional nodes and expanding their functions.
Technical specialties are among the most popular professions in the world. The demand for them is increasing. Which universities in the world provide the best technical education, and how to train highly qualified engineers.
