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In this video, Jim Phillips diagrams and demonstrates the calculations by walking you through a few equations. To learn more check out Jim's Short Circuit Analysis CEU on demand class brainfiller.co... or his Electrical Power Systems Engineering livestream course brainfiller.co....
Per Unit System and Symmetrical Components are used for many short circuit calculations. Electric Utility Data is also often provided in terms of Per Unit and Symmetrical Components. In this video Jim explains how to use the positive, negative and zero sequence impedances in a per unit format to calculate the three phase and line-to-ground short circuit current.
Obviously there is more to the theory of symmetrical components then Jim shows here, but as far as the calculations, they are simple.
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