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PREVIEW-PER-UNIT-SYSTEMS-Rev-4. Texas A&M University ECEN 610

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PREVIEW-PER-UNIT-SYSTEMS-Rev-4. Texas A&M University ECEN 610Fundamental to any power system analysis is the know -how of per unit systems. This metric is widely used to describe voltages, currents, ... and impedances in a power system. This book, supplemented by plenty of examples, will explain how to calculate these pa rameters for any component anywhere in the power system. Let’s begin with why use per unit systems. 1. Transformers and per unit systems The reason the per unit system is employed is because it simplifies calculation of voltages, currents, and impedances of a power system network. Imagine a 3-phase system with a generator, a transformer, a T-line, another transformer, and a load. Every time you cross the transformers, the currents and voltages change. The impedance of the transformer referred to the primary side is different from the impedance of the same transformer referred to the secondary side. It is imperative to use the appropriate impedance based on which side of the transformer you are on, which if not accounted for, introduces serious calculation er rors. Using actual values is fine if not for the transformers. They complicate matters. Generators and motors, like transformers, have different impedance when referred to either stator or rotor winding. Deriving a per unit impedance [Show More]

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