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Nikos E. Mastorakis  - - - 
Top co-authors
Marc A. Rosen

435 shared publications

Faculty of Engineering and Applied Science, University of Ontario Institute of Technology, Oshawa, Ontario, Canada

Carmen A. Bulucea

7 shared publications

University of Medicine and Pharmacy of Craiova, Faculty of Medicine, Craiova 200349, Romania

Doru Nicola

2 shared publications

Faculty of Electrical Engineering, University of Craiova, Decebal Street 107, Craiova, 200440, Romania

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Publication Record
Distribution of Articles published per year 
(2012 - 2018)
Total number of journals
published in
 
4
 
Publications See all
Article 0 Reads 0 Citations Evaluating through mathematical modelling the power equipment busbars electrodynamic strength under sudden short-circuit... Cornelia A. Bulucea, Constantin Brindusa, Doru A. Nicola, Ni... Published: 01 January 2018
MATEC Web of Conferences, doi: 10.1051/matecconf/201821002004
DOI See at publisher website
Article 5 Reads 0 Citations Operation analysis of AC traction motors in terms of electromagnetic torque capability on sustainable railway vehicles Cornelia A. Bulucea, Doru A. Nicola, Marc A. Rosen, Nikos E.... Published: 21 October 2016
MATEC Web of Conferences, doi: 10.1051/matecconf/20167602005
DOI See at publisher website ABS Show/hide abstract
Sustainable operation of electric railway systems represents a significant purpose nowadays in the development of high power and high speed locomotives and trains. At present, high speed electric vehicles mostly work with three-phase induction motors or three-phase synchronous motors as traction motors. The two electric machine types have different efficiencies at different operation points, and experience differences with respect to safety, speed and power, energy use and exergy efficiency. An important issue that correlates these aspects is the electromagnetic torque developed by an electric traction motor. In order to provide an overview of the technical performance of the operation of sustainable railway systems, a detailed analysis is carried out of the electromagnetic torque capability of AC electric motors utilized as traction motors in modern locomotives of high power and/or high speed. The results of this work may help in enhancing the main criteria for optimising the safe and sustainable operation of electric railway traction systems.
Article 5 Reads 0 Citations Evaluating the Thermal Pollution Caused by Wastewaters Discharged from a Chain of Coal-Fired Power Plants along a River Marc A. Rosen, Cornelia A. Bulucea, Nikos E. Mastorakis, Car... Published: 13 May 2015
Sustainability, doi: 10.3390/su7055920
DOI See at publisher website ABS Show/hide abstract
Reliable and safe operation of a coal-fired power plant is strongly linked to freshwater resources, and environmental problems related to water sources and wastewater discharge are challenges for power station operation. In this study, an evaluation on the basis of a wastewater thermal pollution vector is reported for the environmental impact of residual water generated and discharged in the Jiu River during the operation of thermoelectric units of the Rovinari, Turceni and Craiova coal-fired power plants in Romania. Wastewater thermal pollutant vector Plane Projection is applied for assessing the water temperature evolution in the water flow lane created downstream of each power plant wastewater outlet channel. Simulation on the basis of an Electricity of France model, and testing validation of the results for thermoelectric units of 330 MW of these power plants are presented.
Article 1 Read 2 Citations Addressing the Impact of Environmental Xenobiotics in Coal-Fired Flue Gas Cornelia A. Bulucea, Marc A. Rosen, Nikos E. Mastorakis, Car... Published: 05 March 2015
Sustainability, doi: 10.3390/su7032678
DOI See at publisher website ABS Show/hide abstract
Dangerous and unstable situations can result from the presence of environmental xenobiotics since their harmful effects on humans and ecosystems are often unpredictable, and building awareness of the environmental risk should be a main concern of humankind. The environmental xenobiotics in the flue gas from a fossil fuel-fired electrical generating station, such as particulate matter (PM), sulfur dioxide (SO2), nitrogen oxides (NOx), and carbon dioxide (CO2), are analyzed in this study, since these xenobiotics are persistent pollutants. Mathematical models of the environmental pollutant vector, estimating the emission factors specific to fossil fuel combustion, are applied to the operation of thermal units in the Turceni electrical generating station, each of which produces a net electrical power of 330 MW. For each stack gas component in the pollutant vector, emission factors and pollutant concentrations are determined. A pattern is also examined depicting the mathematically modelled processes of resonant absorption of an environmental xenobiotic harmonic oscillation by an organism modulated as an absorbing oscillator structure. The xenobiotic concentration degree is represented through a spatial concentration vector, which allows further modelling and simulation of the oscillating regime of environmental xenobiotic absorption.
PROCEEDINGS-ARTICLE 7 Reads 0 Citations Some Aspects of Sustainable Energy Conversion During Transient Processes in Electric Power Systems Comprising Generator ... Cornelia Bulucea, Marc Rosen, Doru Nicola, Nikos Mastorakis,... Published: 31 October 2013
Proceedings of The 3rd World Sustainability Forum, doi: 10.3390/wsf3-d001
DOI See at publisher website
Article 0 Reads 2 Citations Approaching the Processes in the Generator Circuit Breaker at Disconnection through Sustainability Concepts Cornelia A. Bulucea, Marc A. Rosen, Doru A. Nicola, Nikos E.... Published: 19 March 2013
Sustainability, doi: 10.3390/su5031161
DOI See at publisher website ABS Show/hide abstract
Nowadays, the electric connection circuits of power plants (based on fossil fuels as well as renewable sources) entail generator circuit-breakers (GCBs) at the generator terminals, since the presence of that electric equipment offers many advantages related to the sustainability of a power plant. In an alternating current (a.c.) circuit the interruption of a short circuit is performed by the circuit-breaker at the natural passing through zero of the short-circuit current. During the current interruption, an electric arc is generated between the opened contacts of the circuit-breaker. This arc must be cooled and extinguished in a controlled way. Since the synchronous generator stator can flow via highly asymmetrical short-circuit currents, the phenomena which occur in the case of short-circuit currents interruption determine the main stresses of the generator circuit-breaker; the current interruption requirements of a GCB are significantly higher than for the distribution network circuit breakers. For shedding light on the proper moment when the generator circuit-breaker must operate, using the space phasor of the short-circuit currents, the time expression to the first zero passing of the short-circuit current is determined. Here, the manner is investigated in which various factors influence the delay of the zero passing of the short-circuit current. It is shown that the delay time is influenced by the synchronous machine parameters and by the load conditions which precede the short-circuit. Numerical simulations were conducted of the asymmetrical currents in the case of the sudden three-phase short circuit at the terminals of synchronous generators. Further in this study it is emphasized that although the phenomena produced in the electric arc at the terminals of the circuit-breaker are complicated and not completely explained, the concept of exergy is useful in understanding the physical phenomena. The article points out that just after the short-circuit current interruption by the generator the circuit-breaker (when the GCB has been subjected at the metal contact terminals to the high temperature of a plasma arc, up to 50,000 K) between its opened contacts, there arises the transient recovery voltage (TRV) which constitutes the most important dielectric stress after the electric arc extinction. Since the magnitude and shape of the TRV occurring across the generator circuit-breaker are critical parameters in the recovering gap after the current zero, in this paper, we model, for the case of the faults fed by the main step-up transformer, the equivalent configurations, with operational impedances, for the TRV calculation, taking into account the main transformer parameters, on the basis of the symmetrical components method.
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