Carmen MOTORGA


31-46 ANALIZA UNOR SISTEME CLASICE DE TELEMĂSURARE A NIVELULUI LICHIDELOR. SISTEME PLUTITOR-POTENȚIOMETRU CIRCULAR ȘI PLUTITOR- SELSINE – Partea a II-a

FOR LIQUID LEVEL. FLOATING-POTENTIOMETER AND FLOATING-SELSINS SYSTEMS – Part II

 

The paper presents an analysis of four classic telemetry systems for level measurement, i.e.: for three such systems with float and counterweight, such as those with D.C. pulses, with potentiometer and a D.C. voltmeter, and two identical selsins, one transmitter and one receiver, and a resistive transducer system and logo meter level indicator, which is only used for liquids that have low resistivity. At the last system, it was made a study about linearized conversion, liquid level in the angular displacement of the indicator.

 

Keywords: float level sensor, transducer resistive level gauge logometru, synchro

Cuvinte cheie: traductor de nivel cu plutitor, traductor rezistiv de nivel, logometru indicator de nivel, selsin

Descărcare text


31-45 ANALIZA UNOR SISTEME CLASICE DE TELEMĂSURARE A NIVELULUI LICHIDELOR. SISTEME CU IMPULSURI DE C.C. ȘI CU LOGOMETRU DE NIVEL Partea I-a

ANALYSIS ON CLASSIC TELEMETRY SYSTEMS USED FOR LIQUID LEVEL. D.C. PULSES SYSTEMS AND LEVEL LOGOMETER – Part I

 

The paper presents an analysis of four classic telemetry systems for level measurement, i.e.: for three such systems with floating and counterweight, such as those with D.C. pulses, with potentiometer and a D.C. voltmeter, and two identical selsins, one transmitter and one receiver, and a resistive transducer system and logo meter level indicator, which is only used for liquids that have low resistivity. At the last system, it was made a study about linearized conversion, for liquid level in the angular displacement of the indicator.

 

Keywords: float level sensor, transducer resistive level gauge logometru, synchro

Cuvinte cheie: traductor de nivel cu plutitor, traductor rezistiv de nivel, logometru indicator de nivel, selsin

Descarcare text


31-40 ANALIZA CU ELEMENTE FINITE TRIDIMENSIONALE A MAŞINII SINCRONE HOMO-HETEROPOLARE UTILIZATĂ CA GENERATOR ÎN APLICAŢII EOLIENE SAU LA MICROHIDROCENTRALE

3D FEM VALIDATION OF HOMO-HETEROPOLAR SYNCHRONOUS MACHINE FOR WIND OR HYDRO APPLICATIONS

 

In an effort to introduce a low cost (PM less), low power electric wind or hydro generators, this paper reports on preliminary design aspects, 3D FEM analysis of a 2.5 KVA, 250-1000 rpm, reactive homo-heteropolar brushless synchronous machine (RHHBSM).

 

Keywords: three-dimensional finite element analysis, homo-heteropolar synchronous machine rotating excitation stator applications reduced wind power, small hydro

 

Cuvinte cheie: analiza cu element finit tridimensională, maşină sincronă homo-heteropolară rotativă, excitaţie statorică, aplicaţii eoliene de putere redusă, microhidrocentrale

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29-59 DETERMINAREA OPTIMALĂ A PARAMETRILOR GENERATORULUI ELECTRIC ASINCRON CU DOUĂ ÎNFĂŞURĂRI STATORICE – MODELUL MATEMATIC

PARAMETER OPTIMAL IDENTIFICATION OF DUAL THREE
PHASES STATOR WINDING INDUCTION MACHINE –
MATHEMATICAL MODEL
The parameter identification of a dual three phase’s stator winding
induction machine is approached in this paper by the genetic optimal algorithm.
The estimated parameter are: the voltage ratio between main and auxiliary
winding, the main winding resistance and leakage reactance, the cage rotor
resistance and reactance, the coupling leakage reactance between main and
auxiliary winding, the magnetization non saturated reactance, equivalent iron
loss resistance and mechanical losses including their variation with speed.
Keywords: asynchronous generator, two stator windings, equivalent
scheme parameters, calculating the optimal genetic algorithm
Cuvinte cheie: generator electric asincron, două înfăşurări statorice,
parametrii schemei echivalente, calcul optimal cu metoda algoritmilor genetici

Descărcare text 


28-37 SISTEM DE CONVERSIE CU TURAŢIE VARIABILĂ A ENERGIEI EOLIENE ŞI HIDRAULICE UTILIZÂND GENERATORUL ELECTRIC ASINCRON CU DOUĂ ÎNFĂŞURĂRI STATORICE

WIND AND HYDRO VARIABLE SPEED ENERGY CONVERSION SYSTEM WITH DUAL STATOR WINDING INDUCTION GENERATOR
Induction generator with dual stator winding is very good for low power and speed, wind and hydro power plant systems, because it has a good controllability, low reactive power consumption, low cost and flexible characteristics. In this paper is presented an variable speed energy conversion system with this type of generator.
Keywords: induction generator stator windings, low power and speed, wind and hydraulic active rectifier, diode bridge
Cuvinte cheie: generator electric asincron două înfăşurări statorice, putere şi turaţie reduse, energie eoliană şi hidraulică, redresor activ, punte cu diode

Descarcare text


25-49 CALCULUL CU ELEMENTE FINITE A PARAMETRILOR ŞI CARACTERISTICILOR GENERATORULUI ELECTRIC ASINCRON CU DOUĂ ÎNFĂŞURĂRI STATORICE

FINITE ELEMENT CALCULATION OF THE PARAMETERS
AND CHARACTERISTICS OF ELECTRIC GENERATOR
STATOR WINDINGS WITH TWO ASYNCHRONOUS
Induction generator with dual stator winding is very good for low power
and speed, wind and hydro power plant systems, because it has a good
controllability, low reactive power consumption, low cost and flexible
characteristics. In this paper is presented the 2D finite element method (FEM)
analysis, and parameters and characteristics.
Keywords: electrical generator stator windings, two asynchronous, low
speed, power and finite element analysis
Cuvinte cheie: generator electric asincron, două înfăşurări statorice,
putere şi turaţie reduse, analiză cu elemente finite
Descarcare text


19-54 UTILIZAREA INDUSTRIALĂ A CONVERTOARELOR STATICE DE MARE PUTERE (I)

INDUSTRY APPLICATIONS WITH HIGH POWER STATIC
CONVERTERS
The use of AC Drives in the industry applications has seen tremendous
growth over the last 40 years with the rapid development of high-power
semiconductors, power converter topology, new control strategies, and their
implementation with the advanced digital processors. These have mode it
possible to design drives with higher VA rating, with PWM and VC/DTC.
However, this article presents a real application in Kronospan S.A.
Sebes, with an ACS 5000 ABB static frequencies converter.
Keywords: power electronics, inverters, two and three levels of voltage,
direct torque control, industrial applications
Cuvinte cheie: dispozitive electronice de putere, invertoare pe două şi
trei nivele de tensiune, control direct de cuplu, aplicaţii industriale

54 UTILIZAREA INDUSTRIALĂ A CONVERTOARELOR


19-55 UTILIZAREA INDUSTRIALĂ A CONVERTOARELOR STATICE DE MARE PUTERE (II)

INDUSTRY APPLICATIONS WITH HIGH POWER STATIC
CONVERTERS
The use of AC Drives in the industry applications has seen tremendous
growth over the last 40 years with the rapid development of high-power
semiconductors, power converter topology, new control strategies, and their
implementation with the advanced digital processors. These have mode it
possible to design drives with higher VA rating, with PWM and VC/DTC.
However, this article presents a real application in Kronospan S.A.
Sebes, with an ACS 5000 ABB static frequencies converter.
Keywords: power electronics, inverters, two and three levels of voltage,
direct torque control, industrial applications
Cuvinte cheie: dispozitive electronice de putere, invertoare pe două şi
trei nivele de tensiune, control direct de cuplu, aplicaţii industriale

55 UTILIZAREA INDUSTRIALĂ A CONVERTOARELOR


23-45 GENERATOR ELECTRIC ASINCRON CU DOUĂ ÎNFĂŞURĂRI STATORICE PENTRU SISTEME EOLIENE DE PUTERE ŞI TURAŢIE REDUSE

ASYNCHRONOUS ELECTRIC GENERATOR WITH DUAL
STATOR WINDING FOR LOW POWER
AND SPEED WIND SYSTEM
Asynchronous generator with dual stator winding is very good for low
power and speed wind systems because it has a good controllability, low power
capacitor bank and flexible characteristics.
Cuvinte cheie: generator electric asincron, două înfăşurări statorice,
invertor, baterie de condensatoare
Keywords: asynchronous electric generator, stator windings second,
inverter, battery of capacitors

23-45 GENERATOR ELECTRIC ASINCRON CU DOUĂ ÎNFĂŞURĂRI STATORICE PENTRU SISTEME EOLIENE DE PUTERE ŞI TURAŢIE REDUSE


21-47 ÎMBUNĂTĂŢIREA INDICATORILOR CALITATIVI DE UTILIZARE A ENERGIEI ELECTRICE LA CAE

INDICATORS QUALITATIVE IMPROVEMENT
OF ELECTRICAL ENERGY AT EAF
Electric arc furnace is one of consumers who have negative effects in
terms of the circulation of reactive power, un-balance consumer, and harmonics
injected into the network.
Cuvinte cheie: cuptor electric cu arc, instalaţie de compensare, factor de
putere, filtrare a curenţilor armonici
Keywords: electric arc furnace, air compensation, power factor, filtering
of harmonic currents

47 ÎMBUNĂTĂŢIREA INDICATORILOR CALITATIVI DE


21-35 ACŢIONĂRI ELECTRICE PERFORMANTE CU MAŞINI ASINCRONE ŞI SINCRONE

ASYNCHRONOUS AND SYNCHRONOUS PERFORMANCE
ELECTRIC DRIVES
Power electronics controlled high-performance AC drives belong to hightech
industry is one of main factors for energy saving and productivity growth.
Cuvinte cheie: acţionări electrice, convertor sursă de tensiune, convertor
sursă de curent, convertor matricial.
Keywords: drives, converter voltage source, current source converter,
matrix converter

35 ACŢIONĂRI ELECTRICE PERFORMANTE CU MAŞINI