Power System Disturbances

Normal and  emergency conditions in electric power systems (EPS), current and voltage stresses in EPS, significance of current stresses determination in EPS for dimensioning process as well as earth and phase overcurrent protection coordination, physical background of phenomena during phase-to-phase and earth faults, phase-to-phase and earth-fault currents calculation by applying symmetrical components approach, calculation of characteristic fault parameters according to appropriate standards, principles and methods for phase-to-phase and earth-fault current calculation applying computer software tools, electrical conductor interruption, methods and reasons for neutral-point earthing, impact of neutral earthing on earth-fault currents and switching overvoltages in EPS, basic principles of fault currents switching and description of physical conditions in switching devices during fault current switching.

The objective of the course on Power System Disturbances is to submit understanding the physical background of phenomena leading to appearance of overvoltages and current overloading in EPS (line-to-line faults, earth-faults). A student learns the importance of knowing fault- and earth-current parameters for dimensioning process of EPS elements and setting-up overcurrent protection, further learns the methods of fault calculation and meets the standards in this field. In terms of behaviour of the system in case of disturbances, he will understand the ways and methods of an EPS neutral point grounding as well basic methods and physical principles for elimination of EPS elements that represent a source of system disturbances.

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.

Lectures and laboratory practice