Presents investigations on blocking  algorithm for transformer  current  protections  during magnetizing  inrush  current. The investigations have shown that the algorithm has high sensitivity and reliably determines magnetizing  inrush current modes.

The paper considers basic concepts in the design of modern wind energy conversion systems (WECS). The analysis of control methods and systems which are capable to realize operational mode  with maximum  output  power  has been presented in the paper.  Functional diagrams of systems for different electric generators, mechanical gears and various combinations of electric power supply and control systems have been have been given in the paper. WECS structures that meet the operational requirements in Belarus have been determined in the paper. 

The paper proposes methodology  for evaluation of storage  system influence on energy losses. The methodology makes it possible to investigate  influence of some operational modes of devices on energy losses for a wide range of variants pertaining to reset conditions. The paper provides mathematical dependences that determine criteria for maximization of energy loss reduction.

The paper proposes a scheme for fuzzy-regulation of reactive power and voltage in electrical power network where static thyristor-controlled compensators are used as a source of reactive power. Description of formalized procedure pertaining to  fuzzy  regulator  in  the  form of  fuzzy  relations between controlled  (voltage) and controllable parameters of the network (current and reactive power of a condensator). An algorithm efficiency proposed for a fuzzy-logic regulator and used for regulation of static condensators has been shown on the basis of calculative experiments and an electric power network taken as an exemple

Reliability  of  distributive  systems  for  electric supply of consumers is considered as a multi-criteria function. For this reason while developing an algorithm for determination  of  optimum  reliability  level  of distributive networks it is necessary to take into account probability character of changes  in corresponding indices.  A mathematical model and algorithm have been developed for determination of optimum reliability level of electric supply systems with due account of probability changes in reliability indices of component elements.

The paper briefly describes the current state of power engineering industry  in the  Islamic Republic of Iran, contribution to gross output of electric power of gas turbine  power stations, combined-cycle power stations, hydroelectric power stations, wind power stations and solar power stations.  Substantiation of prospects pertaining to further development of alternative energy sources  in  the  Islamic Republic of Iran  in the context of availability of natural resources, economic efficiency and ecological safety

Development of methods for complex efficiency evaluation of measures on energy saving can be based on usage of single-factor mathematical models for specific consumption of fuel and power resources by output volume. The paper investigates regularities pertaining to formation of resulting energy efficiency of tire production using introduction of energy saving measures  with due account of changes in industrial consumer program on fuel and power resources and power consumption structure.

The paper proposes a vortex heat generator with energy transformation of the highest  state  of matter motion  into  the  lowest  one  as  a  heat  supply  source  for a mobile object. Energy transformation coefficient indices close or equal to 1 have been obtained as a result of experiments on efficiency of the vortex heat generator. Such results can be explained with the help of the 2nd Bohr quantum postulate. 

Standard series of certified VTG heat generators has been proposed for heat supply of the mobile object (field hospital).

Investigation of heat transfer on the surface of a circular cylinder with asymmetrical gas inlet  conditions in  a  cyclone chamber  has been executed while changing an aggregate state of heating agent  that is slightly superheated steam which is supplied  into the cylinder-calorimeter. Air has been supplied into the cyclone chamber  from  two diametrically opposite sides through  the slots in the top and bottom parts of the transverse planes on  a  relative distance from the ends which is equal to 0,5Dк. Unbalanced stream input into the chamber has been created  due to varying  the inlet relative area  in  its  bottom  part.  The obtained  data have been processed  in the  form of dependence of the average Nusselt number on Re number and a parameter characterizing the asymmetry of the inlet.

The paper considers a heat regime in heated premises, contains information on calculation of optimum enclosure layer size,  development of mathematical model for analysis of air temperature in the premises, heat flows when heat influence is of arbitrary character and substantiates efficient usage of , analyses mathematical model elaborated, effective use of programmable heat consumption.

The paper proposes a specific assessment of heat resistant steel residual resource which  is  based  on  time determination of pore output on grain boundary with due account of an operational temperature, chemical composition and structure of the investigated steel.

The paper considers a possibility  to use a  thermal pump and heat-exchange device  in  the ventilation system  for heat utilization of exhaust air. An  influence of air characteristics on  energy  efficiency  of heat-utilizing installations has been shown in the paper. Specific feature of the thermal pump application is the fact hat a source of secondary heat has higher temperature than a consumer. The paper contains results of thermal pump and heat exchange device parameters, hat characterize their efficiency while being applied in a ventilation system.