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 rendek grafikus formában itt láthatók.

Ajánlott:
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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