Volume 9, number 1, 2015: Print version and published papers:
THE STUDY, DESIGN AND TESTING OF A LINEAR OSCILLATING GENERATOR WITH MOVING PERMANENT MAGNETS
Teodora Susana OROS (POP)1, Ioan BERINDE1, Radu POP1, 1 Technical University of Cluj Napoca, teodoraoros_87@yahoo.com
Keywords: linear oscillating generator, permanent magnet
Abstract: This paper presents a study, design and testing of a Linear Oscillating Generator. There are presented the main steps of the magnetic and electric calculations for a permanent magnet linear alternator of fixed coil and moving magnets type. Finally it has been shown the comparative analysis between the linear oscillating generator with moving permanent magnets in no load operation and load operation.
OPERATION OF WIND FARMS TO DEFECTS IN THE MEDIUM VOLTAGE GRID
Ioan BERINDE1, Teodora Susana OROS (POP)2 , 1,2 Technical University of Cluj-Napoca, Romania, Faculty of Electrical Engineering, Department of Power Engineering and Management, Memorandumului 28, 400114, Cluj-Napoca, Romania, ioan_berinde@yahoo.com,
Keywords: Wind Farm, Medium Voltage
Abstract: Integrating wind power in medium voltage networks raise problems both economic and technical. The article presents a wind power plant integration in a medium voltage network and its operation in case of fault on other section than the line that wind power plant inject power. In the wind power plant is connected and compensator STATCOM for reactive power compensation. The wind power plant is equipped with squirrel cage induction generators.
Levente CZUMBIL, Dan Doru MICU, DenisaȘTEȚ, Andrei CECLAN,Dep. of Electrotechnics and Measurement, Technical University of Cluj-Napoca, Romania, levente.czumbil@ethm.utcluj.ro
Keywords: electromagnetic compatibility, electromagnetic interference, finite element methods, neural networks, pipelines, transmission lines
Abstract: The current paper presents an artificial intelligence based technique applied in the investigation of electromagnetic interference problems between high voltage power lines (HVPL) and nearby underground metallic pipelines (MP). An artificial neural network (NN) solution has been implemented by the authors to evaluate the inductive coupling between HVPL and MP for different constructive geometries of an electromagnetic interference problem considering a multi-layer soil structure. Obtained results are compared to solutions provided by a finite element method (FEM) based analysis and considered as reference. The advantage of the proposed method yields in a simplified computation model compared to FEM, and implicitly a lower computational time.
A SYSTEM FOR REMOTE MONITORING OF THE HUMAN BODY PARAMETERS
Oliviu MATEI1, Claudia MATEI2, Ioan VLAD3, Cristinel COSTEA1 , 1 Technical University of Cluj-Napoca,North University Centre of Baia Mare, 2 Active Aging Association, 3 Intellisoft Association, oliviu.matei@cunbm.utcluj.ro, cabdia@yahoo.com, ioan.vlad@intellisoft.ro, cristinel.costea@cunbm.utcluj.ro
Keywords: Genetic algorithms, Wearable computers
Abstract: We present an invention (pending patent number A 201100939) related to a system that monitors human body parameters, such as heart rate and blood pressure, and when they are out of the regular range, it transmits a remote warning signal along with the GPS coordinates of the patient to the special intervention services, or to the tutors, so that they can take action in the shortest time. The most important aspect of the system is its mobility, the patient being able to live her normal life, not having to stay in a fix perimeter, as it is the case for most monitoring equipments. The scope of the invention is the health of people, both individually and at the institutions involved in health insurance, such as clinics, hospitals, emergency services, rescue, SMURD, social settlements, etc.
TRANSIENT REGIMES OF THE THREE-PHASE POWER TRANSFORMERS
Olivian CHIVER, Liviu NEAMT,Eleonora POP,Cristian BARZ, Adina POP VĂDEAN, Paul Petrică POP , Electrical, Electronic and Computer Engineering Department, North University Center of Baia Mare, Technical University of Cluj-Napoca,olivian.chiver@cunbm.utcluj.ro
Keywords: Power transformer, finite elements, transient analysis
Abstract: The transient regimes of a three-phase power transformer will be studied in this paper. The transient currents in the windings will be determined both analytically and by finite elements method (FEM). The no load and short circuit regimes will be considered. The current dependence of the instantaneous phase voltage and of the initial current value will be highlighted, by FEM. In order to determine analytically the transient currents, for inductances the analytical and FEM values will be used. The inductances are determined with FEM through the simulation of experimental tests. With FEM, the transient currents will be determined using transient analysis. Finally, the FEM and analytical results will be compared and discussed.