Transients in power systems

• Calculate simple transients analytically and numerically
• Establish broad band models for some common components
• Evaluate a component’s electrical characteristics under transient voltages
• Use PSCAD as numerical tool for time domain simulations
• Distinguish between models with and without distributed parametres
• Apply a number of electromagnetic principles to power components
• Calculate over voltages under switching events and lightning exposure
• Understand the basic principles of overvoltage protection

A number of fundamental topics relevant for the power system and its components will be treated.
Transients occur under lightning and under switching processes in the grid, including closing and breaking actions.
Calculation of overvoltages requires application of high frequent component equivalents based on lumped circuits, as well as including transmission line models with distributed parameters.
In particular will be treated cables, breakers and transformers in different configurations. Also covered are calculation of overvoltages in overhead line systems under lightning.
The system’s response and resistance against these transients are investigated by means of insulation coordination.
The numerical tool mainly used is PSCAD.

31730/46700, 46700/31730 Electric Power Engineering, fundamentals

Lectures and group work. A number of mandatory problems have to be solved incl. a larger simulation assignment by means of a numerical time domain tool. Approval of the solutions is required for passing the course.