Operation of Electrical Power Systems during Disturbances

Subject description

Normal and abnormal conditions in electric power systems (EPS), current overloading and voltage stress in an EPS, importance of identification of current and voltage stress, determination of pfase-to-phase and phase-to-earth parameters applying symmetrical components, simplified calculation applying the method of relative voltage drops, determination of characteristic pfase-to-phase and phase-to-earth quantities, neutral point earthing, its impact on earth faults and switching overvoltages, basic principles of fault currents disconnection, basics of dynamic phenomena ocurring in fault events, basics of determination of EPS elements ratings on the basis of fault currents.

The subject is taught in programs

Objectives and competences

Students get acquainted with the consequences

The objective of the course on Operation of Electrical Power Systems during Disturbances is to submit knowledge about physical background of phenomena leading to appearance of overvoltages and current overloading in EPS (line-to-line faults, earth-faults). Students get acquainted with the consequences of disturbances in an EPS, with their impact on EPS operation and the importance of having data of fault calculation quantities for the design and development of elements of a power system network. Further they learn the method of calculating short-circuit variables according to the standards and simplified method of calculation, which allows a quick assessment of short-circuit quantities. They take cognizance of the influence of EPS grounding on consequences of disturbances and the basic principles for the elimination of defective parts of EPSs. Finally, the basics of  EPS's elements sizing, which is based on current loading, are learned.

The knowledge acquired is fundamental in planning elements and parts of an EPS as well as for understanding of protection system and a protection coordination.

Teaching and learning methods

Lectures, laboratory exercises

Expected study results

After successful completion of the course, students should be able to:

  • know the consequences of disturbances in electric power networks,
  • calculate parameters for phaseto-phase and earth-fault faults and use software tools for this purpose, respectively,
  • knowing methods for restraining/limiting fault currents,
  • using acquired knowledge  in dimensioning process of EPS elements.

Basic sources and literature

1.         Roeper, Richard: Kratkostični tokovi v trifaznih omrežjih: časovni potek in izračun veličin, Ljubljana : Fakulteta za elektrotehniko, 1987

2.         I. Papič, P. Žunko: Elektroenergetska tehnika I, Založba FE in FRI, 2005.

3.         Učbenik – (v pripravi-načrtovano za naslednje izvajanje predmeta).

4.         K. Heuck, K. D. Dettmann, D. Schulz: Elektrische EnergieversorgungVieweg-Teubner Verlag, 2010

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University of Ljubljana, Faculty of Electrical Engineering Tržaška cesta 25, 1000 Ljubljana

E:  dekanat@fe.uni-lj.si T:  01 4768 411