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CONTROLLED SHUNT REACTORS FOR ELECTRIC NETWORKS
Authors: Dolgopolov A.G., Kondratenko D.V, JSC "Electric operated reactors", Moscow.Ukolov S.V., JSC "Zaporozhtransformator", Ukraine.Postolaty V. M., Institute of Power Engineering of Academy of Sciences of Moldova
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Abstract: The article presents results of the research and design of controlled shunt alternative current reactors (CSR). The analysis of domestic and foreign experience of the development and deployment of CSR is performed, the effectiveness of their applications in power systems is assessed and results of the tests of samples CSR-220 kV and above are shown. Constructive features of CSR circuit are described; technical characteristics of the CSR-220, 500 kV are given. The prospects for widespread introduction of CSR for the control of power systems regimes are shown. The application of CSR in combination with other control devices such as FACTS allows, based on high-voltage lines of high capacity, creating controlled transmission lines of new generation, which corresponds to all necessary requirements with time-developing power systems and its associations. |
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Keywords: Controlled shunt reactor (CSR), means of regulation, power systems, controlled transmission line.
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POWER CHARACTERISTICS OF TWO CORE MODIFIED PHASE SHIFT TRANSFORMER
Authors: L.Calinin, d. Zaiţev, M.Tîrşu, V.BerzanInstitute of Power Engineering of the Academy of Sciences of Moldova, Kishinau, Republic of Moldova
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Abstract: The paper is aimed to Simulink modeling of different functioning modes of two core modified phase shift transformer. This one allowing to determine power characteristics of installation, analyze and compare of results obtained by mathematical modeling and experimental data obtained by help of physical sample of installation, performed on base technical solution called “Marcereu Connection”. |
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Keywords: simulation, phase shift transformer, power characteristics.
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COMBINED COOLING OF CONDENSATION UNIT OF VAPOR COMPRESSION REFRIGERATION STATIONS
Authors: V.A. Maksimenko, A.N. Fot, Omsk State Technical University, Russian Federation
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Abstract: In large refrigeration systems it is used to compose condensation node with water-cooled condensers. In actual conditions of deficit and increase of cooling water price it is appropriate combined cooling of condensation unit on existing and developed large refrigeration facilities. Combined cooling of condensation unit allows stabilizing the condensing pressure and significantly reducing the consumption of cooling water. |
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Keywords: combined cooling, condensation unit, water cooling, air cooling.
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ESTIMATION OF INDICES OF QUALITY OF WORK OF HEAT PUMP WITH VORTEX TUBE
Authors: Sit M.L. (Institute of Power Engineering of the ASM), Ioisher A.M. (Research Institute "ELIRI"),Sit B.M. (Institute of Power Engineering of the ASM)
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Abstract: It is performed analisys of the use of efficiency of the use of vortex tube in heat pump with carbon dioxide as the refrigerant. Heat pump is desinated for parallel production of of heat on one temperature level and cold on two temperature levels. Scheme is compared with heat pump in which ejectors are used. It is demonstrated on the exemple that scheme with the vortex tube has COP increased comparitive with those with ejectors. |
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Keywords: heat pump, carbon dioxide, vortex tube, energy efficiency.
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POWERED LED LIGHTING SUPPLIED FROM PV CELLS
Authors: M.Tîrşu, M.Uzun, A.SpeianInstitute of Power Engineering of Academy of Sciences of Moldova, Chisinau, Republic of Moldova V.Spivac, A.BogdanInstitute of Applied Electronics of National University of Ukraine (Kiev Polytechnic Institute), Kiev, Ukraine
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Abstract: The paper deals with practical realization of efficient lighting system based on LED’s of 80W total power mounted on corridor ceiling total length of which is 120m and substitutes existing traditional lighting system consisting of 29 lighting blocks with 4 fluorescent lamps each of them and summary power 2088W. Realized lighting system is supplied from two photovoltaic panels of power 170W. Generated energy by PV cells is accumulated in two accumulators of 75Ah capacity and from battery by means of specialized convertor is applied to lighting system. Additionally, paper present data measured by digital weather station (solar radiation and UV index), which is mounted near of PV cells and comparative analyze of solar energy with real energy generated by PV cells is done. Measured parameters by digital weather station are stored by computer in on-line mode. |
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Keywords: Sistem fotovoltaic, baterii de stocare, celule fotovoltaice, sistem de iluminare, LED-uri
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COMPARATIVE ANALISYS OF THE EFFICIENCY OF SOME TYPES OF STOVES
Authors: Kamenschic E.S.Institute of Power Engineering of the ASM
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Abstract: The paper analyzes construction of various stoves and ovens. There are prezented calculations of fuel consumption, firebox dimensions, convective system, heat accumulation, heat exchange and heat transfer of stoves. |
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Keywords: stove, heating, method of calculation.
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ACTIONS REGARDING INCREASING OF EFFICENCY OF ELECTRIC NETWORK
Authors: Gritai M.A. (Institute of Power Engineering of Academy of Sciences of Moldova)
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Abstract: The retrospective analysis of losses of energy in the electrical network of several institutions of the Academy of Sciences of Moldova is executed. On the basis of the data of the power consumption for year 2010 losses of energy in all elements of the network are calculated. As a result of calculation is revealed: (1) the established capacity of transformers is superfluous concerning level of the power consumption, (2) transformers are loaded on the average on 17 % f, (3) in structure of losses the basic share (97 %) is made with losses in steel of transformers. The new configuration of a network is offered in which: (i) six (6) transformers are disconnected from a network, (ii) on the side 0.4 kV are established additional electric connections between the disconnected and working transformers, (iii) loading of the disconnected transformers is moved to the working transformers, (iv) the former level of reliability of electricity supply is kept. In the offered network of losses are reduced on 55000 kWh, that gives economy about 100000 MDL in year. |
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Keywords: circuit of an electric network, operating mode, losses of electric energy.
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Nicolae Andronati la 75 de ani
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