Budapest University of Technology and Economics, Faculty of Electrical Engineering and Informatics

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    Alternating Current Systems

    A tantárgy neve magyarul / Name of the subject in Hungarian: Váltakozó áramú rendszerek

    Last updated: 2014. február 13.

    Budapest University of Technology and Economics
    Faculty of Electrical Engineering and Informatics     		Electrical Engineering MSc program
    MSc degree program
    Course ID Semester Assessment Credit Tantárgyfélév
    VIVEM111 1 3/0/0/f 4  
    3. Course coordinator and department Dr. Kádár István,
    Web page of the course http://www.vgt.bme.hu/okt/A_C_S/a_c_s.html
    4. Instructors
    Name: Department:
    Dr. Berta István Electric Power Engineering
    dr. Kádár István Electric Power Engineering
    Szabó László Electric Power Engineering
    5. Required knowledge Mathematics: linear algebra, matrix calculus, complex numbers and complex calculus, linear differential equations
    Electrical engineering
    6. Pre-requisites
    Kötelező:
    NEM ( TárgyEredmény( "BMEVIVEMA13" , "jegy" , _ ) >= 2
    VAGY
    TárgyEredmény("BMEVIVEMA13", "FELVETEL", AktualisFelev()) > 0)

    A fenti forma a Neptun sajátja, ezen technikai okokból nem változtattunk.

    A kötelező előtanulmányi rend az adott szak honlapján és képzési programjában található.

    Ajánlott:
    -
    7. Objectives, learning outcomes and obtained knowledge The course designed for systematization and high level expansion of the basic knowledge in the field of alternating current circuits, networks, devices, equipment and electrical energy converters in steady-state and transient, in order to provide the students application skills.
    8. Synopsis 8.1. Single-phase and three-phase RLC circutis  
    Linear single-phase RLC circuits: current, voltage, power, energy base explanations and expressions, time functions, phasors, harmonics. Problem solutions.
    Linear three-phase RLC circuits: current, voltage, power, energy base explanations and expressions, time functions, phasors, symmetrical components, harmonics. Problem solutions.
    Single-phase RLC circuit switch on-off transients, energy conversions and steady-state. Problem solutions.
    Three-phase (abc+N) Low Voltage system with symmetrical and asymmetrical resistive load: solutions by phase (abc) or symmetrical component (012) method.Problem solutions.

    8.2. Alternating magnetic field
    Review of fundamentals. Description and illustration of magnetic field, effect of substance, basic rules of electromagnetism, ferromagnetic materials, hysteresis. Self and mutual inductance, coupled windings. Force, torque, energy.
    Components and calculation of iron losses in alternating magnetic field,. Magnetic circuits, calculation methodes, leakage.
    Energy of coupled windings. Permanent magnets, optimal design. Force of permanent and electromagnets.
    Superconduction, influence of magnetic field on superconductors.

    8.3. Princip and application of Park-vector for calculation and design
    Sinusoidal function - phasor - vector. Physical background of Park transformation, rotating magnetic field. Definítion, cooordinate systems, zero sequence components. Application of Park-vector to scalar values. Park-vector in static and rotating coordinate systems. Park-vector diagram (graph, plot). Phase values and Park-vector.
    Description of threephase systems using Park-vector equations. Calculation of voltage, current and flux in steady state, asymmetrical and transient operation. Representation on oscilloscope. Effect of time harmonics. Description of periodic nonsynusoidal state, harmonic analysis. Application example: induction machine fed from six-step inverter.

    8.4. Alternating electrical field
    Properties of electrical fields. Forces and energies in electrical
    fields. Filed distribution in insulators. Analytical and numerical filed
    computations. Insulting materials in alternating field. Electrical
    conductivity, dielectric polarization and the polarization spectrum.
    Alternating voltage on insulation, vector diagram, layered insulation.
    Dielectric properties of insulating materials, frequency and temperature
    dependence of dielectric properties (dielectric loss and loss factor)
    Generation and measurement of alternating electrical fields. Field
    distribution of overhead power lines and cables. insulation testing by
    ac voltage. Voltage stresses and withstand test.
    9. Method of instruction Lectures
    11. Recaps Four tests are written during the semester, the grade determined as the average of tests.
    12. Consultations Two tests may be repeated.
    13. References, textbooks and resources Hambley, A. R.: Electrical Engineering. Pearson, 2011. ISBN-13 978-0-13-215516-8
    Lázár J.: Park-Vector Theory of Line-Commutated Three-Phase Bridge Converters. OMIKK Publisher, Budapest, 1987. ISBN 963 592 727 4
    14. Required learning hours and assignment
    Contact hours42
    Preparation for contact hours42
    Preparation for the midterm20
    Consultation16
      
    Total workload120

    15. Syllabus prepared by
    Name: Department:
    Dr. Berta István Electric Power Engineering
    dr. Kádár István Electric Power Engineering
    Szabó László Electric Power Engineering