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Numerical modelling of the transitive and established processes in electric circuits with variable parameters
Authors: Rimsky V.X., Berzan V.P., Patsiuk V.I.
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Abstract: Analytical and numerical approaches to the analysis of the transitive and established processes in electric circuits with the distributed and concentrated parameters are stated. Influence of losses on dynamics of instant values of voltage and currents in a mode of idling is investigated and at short circuit of lines of half-wave and quarter wave length. |
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Keywords: cable equations, half-wave and quarter wave-lines.
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INFLUENCE OF THE DISTRIBUTED AND CONCENTRATED PARAMETERS ON REGIMES OF LINES OF THE ALTERNATIVE VOLTAGE
Authors: Patsiuk V.I.
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Abstract: . On the basis of the equations of the established mode exact formulas for calculation of generated and transmitted capacity in a non-uniform electric circuit with the distributed and concentrated parameters are received. Influence of character of distribution of losses and jet parameters along a line on overflows of capacity in the loaded and non-loaded electricity transmission of a alternative voltage is investigated. |
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Keywords: cable equation, distributed and concentrated parameters, generated and transmitted capacity.
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HOW TO ADJUST THE QUARTER WAVE LINE ON THE HALF-WAVE OPERATING MODE
Authors: Patsiuk V.I.
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Abstract: On the basis of the equations of the established mode the closed formulas for distribution of voltage, currents and active capacity along a non-uniform line with the concentrated elements are received. Inclusion of throttles and condenser batteries in a quarter wave line is examined with the purpose of giving to it of properties half-wave. |
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Keywords: the cable equations, half-wave and quarter wave lines.
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| 4 |
The analysis of an operating mode of the asynchronous generator with capacitor excitation
Authors: S.Postoronca, V.Berzan, Iu. Ermurachi
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Abstract: On the basis of a symbolical method of calculation of electric circuits the analysis of features of work of the three-phase asynchronous generator with two windings on статоре and capacitor excitation is executed. Results of the analysis of influence on a phase corner of a current and voltage of a windings of excitation of the generator are submitted at change of its loading from a mode of idling up to a mode of short circuit. Recommendations on stabilization of a target voltage of the generator are formulated at change of its loading. |
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Keywords: asynchronous generator, capacitor excitation, quality factor.
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Voltage stabilizer of the asynchronous low-frequency generator
Authors: V.Berzan, M. Tîrşu, S.Postoronca
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Abstract: The new method of output voltage stabilization of the asynchronous generator with capacitor excitation is offered. Value of the basic magnetic stream of the three-phase generator is adjusted by consecutive connection of excitation winding outputs to a zero point. In result it is received more high-speed and exact system of stabilization of voltage in independence of the reason of a preset value deviation. Experimental check has confirmed efficiency of the offered way of asynchronous generator voltage stabilization and an opportunity of its use in independent wind power installations |
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The modernization of heat and mass transfer apparatus for energy systems
Authors: Doroshenko A.V., Vasyutynsky S.I.
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Abstract: The use of evaporative cooling for the decision of various problems in power allows solving a number of the important problems in this branch, including ecological. For rational design of such systems it is necessary to study those factors which influence course of processes in evaporating systems. |
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Keywords: evaporative cooling.
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AUTOMATIC CONTROL SYSTEM OF HEAT PUMP STATION GAS COOLER AT THE WIDE RANGE OF HEAT LOAD
Authors: Juravleov A.A., Sit M.L., Sit B.M., Olga Poponova, A. Zubatii
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Abstract: There is examined the structure the of control system of gas cooler of heat pump station, which uses the carbon dioxide as the working fluid in the transctitical thermodynamical cycle. It is analiyed the structure of the complex: heat pump station – district heating system. |
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Keywords: heat pump station, automatic control system.
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| 8 |
FUTURE TRENDS IN SOLAR ENERGETICS
Authors: Doroshenko A.V., Shestopalov K.A.
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Abstract: In the work the methodology of new generation solar flat collectors creation for heating and cooling systems warmly is described on the basis of use of multilayered, multichannel structures made of polymeric materials in their design. The model of the working processes occuring in a solar collector is developed, in view of the mechanism of thermal losses by convection and by radiation. On the offered model characteristics of temperature of the heat-carrier and its charge from time of day (have been received depending on change of intensity of a sunlight and an ambient temperature) are well correlated with the experimental data. |
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Keywords: solar energetics, solar collectors
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| 9 |
EFFICIENCY OF THE CAPACITY-TYPE SOLAR WATER HEATER WITH THE FLEXIBLE POLYMER ABSORBER.
Authors: Ermuratski V.V., Capralov A.I.
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Abstract: Energetic indexes of solar capacity-type water heaters with flexible polymer absorbers and different constructions of enclosures using the refined method of calculus were obtained. |
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Keywords: Solar radiation, water heaters.
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| 10 |
DECREASING THE COST OF WIND TURBINE WITH VERTICALLY INSTALLED ROTOR WHEEL
Authors: Anisimov V.K.
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Abstract: The cost dependence of the most expensive parts of the vertical rotor windmill and their sizes (height and diameter) was studied. The formulae were obtained allowing determining the optimum value of such dependence for different modifications of a windmill: with or without wind concentrator. |
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Keywords: turbine blades, concentrator walls.
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| 11 |
PARTICULARITIES OF ELECTRIC GENERATOR FUNCTIONING AT SUPPLYING OF GREENSHOUSE
Authors: Anisimov V
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Abstract: The particular case of consumer supplies with electrical and thermal energy from electric generator located near them is considered. It is shown, that at generator working in maximum power mode and using special design it is possible to receive much more electrical and thermal energy useful to consumer. The possible variant of this device realisation for glasshouse is shown |
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Keywords: generator, electric energy, power, thermal energy, greenhouse
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