Power system networks are subjected to various form of transient phenomena ranging from the relatively slow electromechanical oscillations with synchronous machines and drives to the comparatively fast variations in voltage and current brought about by sudden changes such those due to lightning strokes. Lightning is a common cause of faults and subsequent current outages, but faults can and do occur for many other reasons: opening of one phase of a 3ph system can lead to a rearragement of the circuit inductances and capacitances in such a way that a resonant circuit is produced and excited, non-linear components can bring the system to a unstable condition, power electronic devices produce switching transients with a big harmonic pollution, etc...
The only effective way to investigate these phenomena is to simulate them by means of the very popular software ATP.

 
 

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