Fast Electromagnetic Phenomena in Power Systems

Code 106
Semester Spring
Class Hours - Lab Hours 3 - 0
Lecturers Nikolaos Hatziargyriou, Προυσαλίδης Ιωάννης


Transient behavior of transmission line, traveling wave equations in transmission lines. Lossless transmission line. Traveling wave energy. Heaviside transmission line (distortionless). Bewley and Bergeron models. Line terminations.
Initial wave. Equations in nodes (points of change of Zc. Thevenin equivalent of transmission line. Bewley’s method in successive line segments. Multiple nodes. General line termination (for step voltage function). Capacitive termination. Inductive termination. Short-circuited line: ZT = 0.
Lightning strikes in transmission lines. Earthing wires, Lightning strike on a tower (or an earthing wire). Counterpoises. Annual line breakdown probability. Over-voltages through transformers: Capacitive and electromagnetic transmission of over-voltages.
Operating Over-voltages in transmission lines. Energization and re-energization of a transmission line. Energization and re-energization via coupling resistors. Disconnection of a transmission line. Cable capacitive current interruption. Interruption of reactor loaded or transformer loaded transmission line. Resonances due to line interruption. Open circuit conditions. Single-phase open circuit. Two-phase open-circuit. Implementation of Sequence circuits.
Short-circuit interruption. Single-phase fault nearby busbars. Single-phase fault in the distant end of a line. Cable interruption. Short line fault. Transient over-voltage calculation methods. The computer program EMTP – electric system component models.