The simulation of transient phenomena is for coordination of the insulation as well as the proper design of the protection schemes. Such simulation is also needed to analyze unexpected transient phenomena after their occurrence.. By nature these phenomena are combinations of traveling wave effects on overhead lines and cables, and of oscillations of lumped circuits of generators, transformers and other devices. It is practically impossible to study these electromagnetic transients using hand calculations except for very simple cases. This complexity led to the simulation of transients using computer.
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http://en.oboulo.com/national-conference-on-power-electronics-and-power-systems-2008-simulation-65006.html
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