The paper considers a regime and economic essence of the problem pertaining to determination of the customer contract demand for industrial consumers of electric power with connected load of S_пp > 250 kV×A. A method for determination of the electric power customer half-hour maximum demand is proposed in the paper. The method is based on the calculation of daily average active load and utilization factor with due account of the occurrence probability of a calculated maximum load value.

The paper considers consequences of negative frequency converter influence on insulation of  power supply cables used for submersible installations of electric-centrifugal pumps at oil-producing stations. The possible approaches to the solution of the problem are proposed on the basis of a harmonic analysis of actually measured voltages and currents in a cable.

The paper contains an analysis of the operational conditions of a quarter-wave power supply in an electric system. Its applicability for the operation in electric mains and electric power transportation is shown in the paper.

The paper cites investigation results of electromechanical oscillations in the power system where synchronous generators are equipped with various types of excitation controllers in the presence or absence of system stabilizers. Influence of every controller types on oscillation processes in the power system has been shown in the paper. The paper proposes an approach of optimum selection of setup excitation controller parameters while having system stabilizers. A complete scheme of the «Azerenergy» system has been taken as an example for an analysis of electromechanical oscillations and an influence of excitation controllers on them. Synchronous generators of the system are using excitation controllers of dramatic effect and СДП1- and UNITROL-types having a system stabilizer.

The paper presents a methodology and an example how to calculate thermo-dynamically  justified specific consumer of reference fuel at combined generation of heat and electric power. The methodology is based on an analytical generalization of mode diagrams of the turbine which installed at the TPP.

While calculating self-cost the paper proposes to exclude a conditional division of the equipment into heat- or electric power generating one and heat tariff calculation is carried out on the basis of a market price for electric power.

Results of a numerical analysis of power efficiency in usage of fuel- and power resources in bakery sub-industry of the consumer cooperation in the Republic of Belarus are given in the paper.  The paper reveals economic justification of executing technological modernization of bakery plants with installation of energy-efficient equipment.

The executed analysis has shown that high operational temperature of 200–400 ^оС in the area of outside furnace surface can be decreased up to safety level by selection of dimensions and thermal and physical properties of heat insulation materials and due observation of some boundary conditions. Method for utilization of heat being supplied from hot surface of the same furnace (boundary conditions being observed) with the help of the installed corresponding heat exchanger is considered as a second variant in the paper. Software permitting to execute the required analytical calculations have been elaborated in the paper.

The paper considers a method for evaluation of operational efficiency of heat technologies in accordance with value of fuel specific consumer. Modernization of the given method has been proposed in the paper which presupposes usage of extra factor taking into account cost of initial fuel. The results of investigations can be applied for analysis of systems using various types of initial fuel.

The paper describes stages of ice field freezing on indoor ice rinks. Regime parameters have been determined for ice freezing. The paper presents results of temperature distribution and heat flow in ice massif which have been obtained while solving a differential heat conduction equation.

The paper provides results of laboratory investigations of a steady circulation  motion of fluid in a pre-screen zone of the committed well. The well is equipped with an annulus circulation system of reagent flushing which consists of four supercharge wells. The obtained results agree with calculation formulae which describe joint operation of the wells. This fact testifies about possibility to use calculation formulae for determination of design parameters of an annulus reagent flushing system. The recommended number of supercharge wells is 4 ÷ 6 in accordance with the calculations. The efficiency of restoration pertaining to a specific debit of well model is 95%.