Asymmetry infl uence in electric grid on power losses and electric energy in engine load is reviewed. The method to calculate power losses in asynchronous engine at currents asymmetry is proposed. The method includes use of acting values of phase currents, phase angles and power ratios. It allows computing symmetrical components of phase currents and power losses from reverse sequence currents. The results obtained allow to make a conclusion on capability of the mode with set asymmetry

Тhe article analyzes the influence of intermediate transformers on the technical and economic indicators of an electric drive based on a high-voltage asynchronous electric motor. The analysis of starting systems for high-voltage AC electric motors is carried out. The advantages and disadvantages of a two-transformer high-voltage drive start-up scheme are presented. A model of the high-voltage electric drive system was developed in the Matlab Simulink program. The developed system includes: source, throttle, rectifier, smoothing input filter, inverter, sine filter, asynchronous motor. The IGNT transistors, which are part of the inverter, are controlled using the vector control unit.

The prospects of creating Autonomous power supply systems for hydrocarbon transport facilities are considered. The analysis of object-oriented multicomponent energy sources of various nature is carried out. Energy-efficient solutions for long-distance consumers based on renewable energy sources are proposed.

The article presents the results of a study of the modes of induction equipment designed for aluminum extrusion. Powerful single-phase inductors connected to a threephase network cause asymmetry of currents and voltages, worsening the work of the rest of the equipment of the workshop, sharply increasing losses. The study of the mode of a single-phase inductor in a three-phase network was carried out by software using parametric circuit models built using hybrid analysis. Replacing approximate engineering methods with automated computational algorithms and mathematical modeling made it possible to perform a more accurate calculation. To increase control flexibility in practice, automation of balancing using a microcontroller is proposed. In the problem, the advantages and rationality of heating aluminum with electricity are shown, which allow us to proceed to a calculated estimate of the efficiency of electric heating in comparison with gas.

The article reviews fuel-free facilities to generate electricity, heat and cold, on the basis of pressure-reducing generator valves, where gas preheating is to be eff ected by low potential heat, using heat pump facilities. It is supposed that by increasing price for power transfer media, and fi rst of all - for gas, the commercial criteria of fuel-free facilities, based on pressure-reducing generator valves and heat pumps, will allow to arrange their wide implementation in the industry.

The article shows the ways to improve electricity meters, including to provide a mechanism for adjusting the cost of electricity consumed depending on its quality, the source and the perpetrator of distortion. An example of a block diagram of a meter equipped with a function for adjusting the electricity cost is given.

The material presents a comprehensive description of a three-phase balancing transformer, and also provides an overview of the applications of TST for overload control.

An automated system for intelligent diagnostics of electric motors and alternators is considered. The system based on a signature analysis of the spectrum of current consumed/generated. Both mechanical damage to the equipment and defects in the electrical part are detected, as well as violations of operating conditions. The option of a cloud service for in-depth diagnostics is offered. The proposed system is an effective tool for operating equipment by state.

The article deals with the problems of loss of active and reactive power in distribution networks of an industrial enterprise. The factors influencing the structure of electrical energy losses are identified: technical losses, network configuration, load and operating modes, quality of electrical energy, climatic conditions. Consequences of excess losses in distribution networks are given. The features of the power supply system of industrial enterprises are revealed. The characteristics and basic data of the power supply system of the Kairakkum carpet plant are given. A simplified power supply scheme is considered, taking into account the losses of active and reactive power in individual nodes of the enterprise's power supply system. The main technical and organizational measures to reduce losses of active and reactive power in distribution networks are stated. The conditions for the implementation of technical and organizational measures to reduce electricity losses have been determined.

The paper presents the advantages of working under voltage at power grid companies using modern protective equipment and devices. It is noted that possession of this technology promises an increase in reliability of power supply, reduction of electro-traumatism, labor costs of operating personnel, etc. in the future. The abovementioned advantages are confirmed on the example of experience of this technology possession by employees of Buinskiye electric networks of the Republic of Tatarstan. The work also describes the technology of replacing the pin insulator and the cap on the intermediate pole of 6(10) kV overhead lines with a car hydraulic hoist with an insulated link.