When working on disconnected overhead power lines, near which there are operating power lines, electrical personnel may receive electrical injuries due to the effect of induced voltages, the values of which may exceed permissible values. In the presence of grounding, these values are determined mainly by the magnetic influence of the operating lines, which is associated with the appearance of longitudinal EMF in closed circuits due to an alternating magnetic field. The highest EMF occurs when significant currents flow in the ground, which is typical for single-wire transmission lines that use the ground as a return wire. Such lines can be used in power supply systems for consumers of the agro-industrial complex, as well as to provide electrical energy to objects located in areas remote from the networks of electric power systems (EPS). To ensure the electrical safety of personnel with the possible impact of induced voltages, special measures are used, the choice of which in the conditions of digitalization of the electric power industry should be carried out on the basis of the use of computer technologies. Such technologies can be implemented on the basis of methods and tools for modeling EPS, developed at the Irkutsk State University of Railways. The article presents the results of computer studies aimed at developing a method for determining the induced voltages created by wire-to-ground power lines.

Experimental studies have been carried out in the electric network of the KPL 5-30 floating crane, which made it possible to obtain the necessary initial data for their subsequent processing. According to the results of data processing, conductive low-frequency interference was detected in the coastal electrical network due to slow voltage changes. The expediency of making the necessary technical decisions to eliminate voltage dips and, accordingly, to suppress conductive low-frequency EMFs for slow voltage changes is determined.

Due to the continuous growth in the number and service life of photovoltaic power plants, the task of monitoring their efficiency is urgent. The article shows that the efficiency of a photovoltaic module depends on its load current, solar radiation, temperature and other factors, therefore, it is more convenient to use the values of the conversion coefficient of solar radiation and the sequential resistance of this module to evaluate the effectiveness of the module. The proposed method does not require measurement of the volt-ampere characteristics of photovoltaic modules at the stage of their operation and can be used without disconnecting them from the power plant. The practical application of the proposed methodology will allow timely replacement of photovoltaic modules at photoelectric power plants.

The article discusses the relevance of the application of a new insulation system for electric traction rolling stock machines. Analyzing innovative directions of application of dielectric materials, the author notes that one of the reasons for failures of electric rolling stock components is the breakdown of insulation and inter-turn closure of the armature winding of the traction motor. The technical solutions in production, the main parameters, reliability and durability indicators, as well as the advantages of the considered types of insulation of domestic manufacturers for electric machines of traction rolling stock are given. The conclusion is made about the expediency of using the above new traction engine insulation system.

The analysis of converter substations on IGBT transistors using voltage converters (PN) of various circuitry: two-level, three-level and multi-level and their energy indicators is carried out. The predominant use of three-level PN in the main indicators is shown. The comparison of PN with current converters (PT) was carried out, and their different fields of application were noted. PT based on thyristors are recommended for high-power trunk transmissions, and PN based on IGBT transistors are recommended for inserts, medium and low-power transmissions, as well as control and compensation tools for flexible AC systems. The layouts of converter substations based on PT and PN are given, and a significant reduction in dimensions and occupied areas (approximately twice) with the use of PN is shown.

The transformer of its own needs is an important element that ensures the functioning of the substation. The use of energy-efficient oil transformers with improved (reduced) characteristics of magnetic circuit idling losses allows reducing losses for the substation's own needs. A significant reduction in idling losses is carried out using amorphous steel. The problems of implementing energy-efficient transformers for own needs (TSN) are mainly related to economic difficulties (high cost, long payback period of equipment).