• Description

    This presentation has several purposes: (a) to show a method for accurate high-frequency modeling of transformer windings based on magnetic and electric field simulations for parameter extraction of the detailed equivalent circuit of the entire winding system; (b) to demonstrate a method for fast and accurate transient solution of the circuit differential equations that describe the transient voltage distribution over the winding system; (c) to present a method for taking into account frequency dependent transformer parameters in time domain simulations; and (d) to evaluate the accuracy of the obtained simulation results by comparison with measurement.

  • What problems were resolved?

    1. MagNet modeling of a winding system in its full geometrical complexity in order to extract the L-matrix of magnetic coupling between different winding turns.
    2. ElecNet modeling of a winding system in its full geometrical complexity in order to extract the C-matrix of electric coupling between different winding turns.
    3. Transient simulation of the large equivalent circuit of a winding system.
    4. E- and H-field visualization and evaluation at each time step of the circuit simulation.
  • Technical Level

    Advanced

Dynamic Fault Simulations of Synchronous Motors

  • Description

    Dynamic behavior of electrical machines can cause effects that are difficult to describe and understand. This is particularly important under fault conditions such as different variants of short-circuits occurring due to the failure of the insulation system or the attached power electronics components. Short-circuits are very hazardous for machine and human. They could destroy the machine itself and cause heavy damage to the power supply unit and mechanical coupling components.

    Transient FEM simulations of electrical machines under short-circuit conditions are an important tool for understanding the dynamic effects without the risk of damaging the machine by experiments. In this presentation modeling details and simulation approaches for dynamic analysis of synchronous machines will be presented in detail. The accuracy of the obtained 2-D and 3-D transient electromagnetic simulations will be demonstrated by comparison against the available measurements performed on a chosen testing salient pole synchronous machine under the conditions of three-phase, two-phase and single-phase short-circuit of the stator winding system.

  • Technical Level

    Advanced

Jasmin Smajic

Jasmin Smajic – University of Applied Sciences of Eastern Switzerland (HSR)

Jasmin Smajic received his B.Sc. degree from Faculty of Electrical Engineering in Tuzla (Bosnia and Herzegovina) in 1996. His M.Sc. and Ph.D. degree he received from the Faculty of Electrical Engineering and Computing in Zagreb (Croatia) in 1998 and 2001, respectively, on the topic of numerical computing and optimization of static and time-varying electromagnetic fields in power transformers and electrical machines.
After his postdoctoral research at the ETH Zurich from 2002 to 2004 on the topic of topic of full-Maxwell electromagnetic simulations of photonic crystals, he took a position of scientist at the ABB Corporate Research Centre in Baden-Dättwil (Switzerland) where he stayed until 2011. His work in ABB covered a wide range of projects in the field of computational and applied electromagnetics. Since 2011 he is a professor of electrical engineering at the University of Applied Sciences in Rapperswil (Switzerland) where he is presently leading Computational and Applied Electromagnetics Group.
Jasmin Smajic is a member of CIGRE and IEEE and he has authored over hundred scientific publications, several books, and dozens of patents.