At present, industrial facilities are faced with the problem of lack of electricity to power them at the moments of the greatest peak load. Increasing consumer demands for increased power consumption lead to the need to introduce new energy sources. Recently, there has been a trend of widespread use of renewable energy sources, due to the relative availability and environmental friendliness compared to fuel-fired power plants. Among renewable types of energy, wind energy is the most widespread.

The tasks of preventive monitoring of the technical condition of compressor units at gas transmission facilities are considered. Methods are proposed that allow achieving the greatest accuracy in the conditions of imbalance of data sampling inherent in technical diagnostics through the use of machine learning, taking into account load factors, external and internal environmental conditions. It is shown that the best accuracy of the forecast is achieved when the parameters of the technological environment, technological and electrical load are included in the operational data. Examples of regression algorithms for estimating the residual life using backpropagation and neural network training algorithms are given.

The methodology and results of experimental studies on thermal testing of high-voltage cascade frequency converters are considered on the example of 10 kV, 8 MW IF designed for frequency start and regulation of the rotation speed of a high-voltage synchronous electric motor. A description of the functional scheme of a test bench based on KSO-217, consisting of 8 power cells per phase, connected in series, is presented. The results of thermal tests for the active voltage rectifier were obtained, which made it possible to evaluate various algorithms for controlling the high-voltage frequency converter and the electric drive.

This article discusses the comprehensive modernization of the SARX integrated three-circuit stand designed for thermohydraulic studies of fast neutron reactors with liquid metal heat carriers. The main focus is on the development of a working draft of the technological part, power supply systems, instrumentation and automation (instrumentation and control systems), as well as other related systems aimed at improving the accuracy of modeling and versatility of the platform. In addition to the existing design, a number of innovative elements are planned to be integrated into the upper chamber of the integrated reactor tank model, including a device for closing (opening and closing) reflector openings above the upper plate of the pressure chamber, filter trap simulators and simulators for IR monitoring of the energy level and subcritical condition.

The problems of the classical approach to accounting for active and reactive power at industrial enterprises in the presence of non-sinusoidal modes of network operation are considered. It is proposed to improve the registration of electricity consumption by accounting for active power at the fundamental frequency, and to use an integral current meter in reactive energy metering. It is shown that with the new approach, in the presence of a linear load at the enterprise, the higher harmonics coming from the external network do not affect the total value of the total voltage distortion coefficient, which makes it possible not to take into account distortions in the linear load.

An analysis of surge protection of a medium-voltage distribution substation has been performed. Temporary, switching, and lightning overvoltages are considered. The design, parameters and characteristics of the OPN are given. Examples and special cases of the use of acute renal failure are considered. Various methods of grounding the neutral conductor of the network, types of cable connection, the presence of overhead lines, taking into account their type of supports, and the protection zones of the main line are determined. Examples of protection of motors, generators, gas-free switchgears and a direct current network are given.

Experimental testing of bellows compensators under conditions close to standard ones plays a key role in ensuring the reliability and safety of sodium-cooled nuclear reactors, such as the BN-1200 reactor plant. This scientific article discusses the development and implementation of a mock-up of a bellows compensator block (BSK mock-up) at a specialized SAZ stand, where the working section is located at +16.2 m and connected to a 325×12 mm bypass line pipeline through tees and shut-off valves at the inlet and outlet. For the safe conduct of acceptance tests, electrically operated shut-off valves are provided on the supply and outlet pipelines, which allows the system to be isolated if necessary. The BSK layout is equipped with a protective casing, in the lower part of which there is a sodium leak sensor such as an automobile spark plug, which provides early detection of leak proofness. The signal from the sensor is output to the operator’s console 1PO (room 205) in the form of a light and sound alarm «sodium flowing through the BSK layout», which contributes to rapid response and prevention of emergency situations. The test methodology includes modeling of standard conditions with sodium circulation at temperatures up to 550 °C, pressures up to 10 MPa and flow rates up to 100 m3/h, with static, dynamic and emergency tests to assess the tightness, fatigue strength and effectiveness of safety systems. The results demonstrate the high reliability of the BSK layout, with tightness under pressure up to 12 MPa, minimal deformations under cyclic loads and rapid operation of emergency systems, which confirms its suitability for incident prevention in the BN-1200 control room. Data analysis has revealed design optimization opportunities, reducing risks by 25 %, and highlights the integration of modern monitoring technologies for predictive maintenance. In conclusion, the experimental validation at the SAZ stand strengthens the safety of sodium reactors, contributing to the sustainable development of generation IV nuclear power and recommending further research using digital twins for virtual testing. This approach not only minimizes operational risks, but also increases the efficiency of liquid metal cooling systems, opening up new prospects for innovation in the field of nuclear engineering.

Overview of the most recent and significant achievements of the PRC