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

The fast and deep penetration of the computer networks, process controll systems, sensitive electronic components in every field of the life increases the danger of serious malfunctions, costly breakdowns caused by ovevoltages. The aim of the course is to give knowledges and information which help to detect the reasons of such failures and to provide suitable electromagnetic compatibility (EMC) in order to operate the various electric and electronic equipment without any problem. The course presents up to date knowledges in the special interdisciplinary field of EMC.

General

- Scope of EMC, definitions (susceptibility, immunity, emission, compatibility etc.)

- Principle of “electromagnetic compatibility”

- EMC levels, EMC standardisation

- Sources of disturbances, their classification and characteristics

ESD (electrostatic discharge), LEMP (lightning electromagnetic impulse)

-    Process, conditions and characteristics of electrostatic discharge.

-    Risks caused by electrostatic discharges, protection against ESD.

-    The lightning electromagnetic impulse, main lightning parameters. The effects caused by them

-    The principle of “primary lightning protection”.

-    Harmful effects of lightning electromagnetic impulse to the electrical equipment. Possible coupling methods.

-    The principle of “secondary lightning protection”. The lightning protection zone theory.

-    Passive and active secondary lightning protection measures, and their connection with the lightning protection zones.

-    Types, principles, characteristics and field of application of overvoltage protection devices and circuits.

-    Principle and field of application of multistage overvoltage protection system.

LFI (Low Frequency Interferences)

-    Classification of the disturbing phenomena regarding to the frequency and the way of coupling.

-    The different coupling phenomena, with the characterisation of the source and results of inductions. The classification of permissible limits accordingly to ITU-T specifications.

-    The basic expressions on capacitive coupling for the typical conditions on the induced line.

-    Survey of the various methods for calculating the impedance with earth return.

-    The screening factor.

-    The type and definition of the surface impedances of a tubular conductor. The variation of the surface impedances of a cable sheath with steel armouring, vs. the sheath current

-    The screening factor of a cable sheath for various conditions.

-    The longitudinal to transverse conversion phenomena with the relevant circuits, due to the series unbalance, the shunt unbalance and the terminal unbalance.

RFI (Radio Frequency Interference)

Electromagnetic field, EM radiation

-     Basic quantities, dimensions, units. Polarization, ferromagnetic materials. Maxwell's Equations

-     Short dipole, near and far field. Small loop, near and far field.

-     Impedance concept, high and low impedance fields. Reactive field components

Wave propagation

-     Wave equation, lossy medium, ideal dielectric, vacuum

-     Refractive index

-     Transmission line analogy, reflection, transmission

-     Penetration and propagation in metals

-     Reflection and transmission on planparallel layer

-     Frequency dependence of constitutional parameters

-     Multilayer medium, multiple reflection

Absorbers

-     Task, specification. Design factors. Performance, frequency dependence

Shielding

-     Definition and components of shielding effectiveness (SE)

-     Shielding performance of thin and thick layers

-     Shielding of high impedance fields

-     Problems and solutions of shielding of low impedance fields

-     Practical SE values, frequency dependence

-     SE decreasing factors

-     Apertures

-     Windows and thin films

-     Cables and connectors

3 oral presentation+ 1 laboratory 

During the semester:

-     laboratory is compulsary;

-     homework. Its evaluation: acceptable or not. No marks.

In exam term:

-     examination

CCITT: Calculation of induced voltages and currents in practical cases (ITU, Directives, Vol II, 1986)

Christopoulos, Ch.: Principles and techniques of electromagnetic compatibility (CRC Press 1995)

Horváth, T.: Understandig of Lightning and Lightning Protection, A multimedia teaching guide, Research Studies Press, J. Wiley & Sons, 2006,http://www.willey.com/go/horvath

Horváth, T. - Berta, I: Static Elimination, RSP, John Wiley & Sons, Chichester, 1982

Lecture notes

Schwab, A. J.: Elektromagnetische Verträglichkeit (Springer Verlag, Berlin, 1991)