An analysis of the influence of instrument current transformer errors on operation of current protection of power supply diagram elements has been carried out in the paper. The paper shows the influence of an aperiodic component of transient current and secondary load on current  transformer errors.

Peculiar operational features of measuring elements of electromechanical and microprocessor current protection with their joint operation with electromagnetic current transformers have been analyzed in the paper.

The paper reveals design conditions while determining  electro-dynamic stability currents in flexible cables of electrical installations. The electro-dynamic stability currents of typical open-air 110–330 kV switching centers have been determined with the help of a  computing experiment. The paper contains justification in respect of methods for electro-dynamic stability increase of bus-bars by installation of inter-phase spacers and additional post insulators.

Reduction of total losses in distribution electricity supply network is considered as an important measure which serves for improvement of efficiency of electric power supply systems. This objective can be achieved by optimum distribution of reactive power sources in proper places of distribution electricity supply network. The proposed methodology is based on application of a genetic algorithm. Total expenses for installation of capacitor banks, their operation and also expenses related to electric power losses are considered as an efficiency function which is used for determination of places with optimum values of capacitor bank power. The methodology is the most efficient for selection of optimum places in the network where it is necessary to install capacitor banks with due account of their power control depending on a switched-on load value in the units.

The paper proposes a power circuit of a regulated 12-pulse direct current converter and a thyristor control impulse diagram for traction substations providing the best electric power supply of a rolling stock, train traction efficiency,  smooth direction regulation.

Hoisting equipment for lifting ferromagnetic loads can be designed while using electromagnets and permanent magnets. The second variant finds wider application due to great successes in creation of hard magnetic materials and significantly less electric power consumption. A shortcoming of this design is in the fact that under operational conditions magnetization and demagnetization processes take place in magnetic circuits with various magnetic resistance due to differences in the attracted loads. The proposed design presupposes that load attraction and lowering are controlled without magnetization and demagnetization of the permanent magnet. This effect is achieved by the following way: a strict permanent magnetic flux is directed to a ferromagnetic load or the flux is deviated from it.

The paper considers a possibility to use co-generated complexes having heat technological industrial load for operation in accordance with the requirements of irregularity of electric power generation schedule.

The paper contains a proposal to equip devices for regenerative heat usage with a subsonic converging nozzle with the purpose to reduce smoke content in the operational zone of heating and thermal furnaces applied at machine building and automotive and tractor industries. Calculation of nozzle channel part is given in the paper.

The paper contains an analysis of influence on heat consumption (in the drying processes with the help of flue gases  in mixture with air) such parameters as modes of drying agent recirculation, recirculation coefficient and possible ranges of its values for selection of optimum parameters of this quantity are considered in the paper.

An algorithm and a program  have been developed for calculation of temperature mode in a T-72 tank tower while using numerical methods. The paper reveals a satisfactory convergence of calculated and experimental data. The results pertaining to investigation of influence of various factors on the processes of temperature mode formation in the internal surfaces of the studied object are presented in the paper. The obtained results make it possible to develop technical solutions in respect of protection against condensation of water vapor on the internal surfaces of armored machinery.

The paper analyzes general principles of the developed methodology for determination of fuel consumption indices of the plants which are using high-temperature gas and steam power cycles in any their combination for generation of power energy and heat.