Increasing the Education Quality by Means of Computer-Aided Visualization of the Processes in Electric Power Systems

This paper presents the possibility for increasing the education quality by computer-aided visualization of the processes in electric power systems. For a 20 kV electrical distribution grid operational parameters, such as currents and voltages, are computed to study the behavior of the relay protection and auto-reclosing devices, the protective properties and energy sustainability of metal-oxide surge arresters in the visual programming environment of Matlab Simulink. Standard library blocks as well as user-defined ones are utilized during the simulations. The created blocks encompass the following functionalities of modern numerical relay protection devices: overcurrent protection, short-circuit current protection, earth-fault protection, auto reclosing, tripping and closing coils of a circuit-breaker, metal-oxide surge arrester (MOSA). The assessment of the risks from an exposure to electromagnetic fields with frequency 50 Hz at places under transmission power lines includes the determination of the magnetic flux density. It may be ensured by measurements or calculations.