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Per-unit Systems Applied to Power System

In the power systems analysis field of electrical engineering, a per-unit system is the expression of system quantities as fractions of a defined base unit quantity. Calculations are simplified because quantities expressed as per-unit do not change when they are referred from one side of a transformer to the other. This can be a pronounced advantage in power system analysis. Conversion of per-unit quantities to volts, ohms, or amperes requires a knowledge of the base that the per-unit quantities were referenced to. The per-unit system is used in power flow, short circuit evaluation, motor starting studies etc. The course Per-unit Systems Applied to Power System introduced and developed the p.u. systems applied to concepts and themes of power systems field to engineering students.


1. Introduce and develop the p.u. systems applied to power systems
2. Teach and review this classic methodology
3. Resolution of examples and academic exercises
4. Real examples

Courses Contents:

1. Power system introduction
2. Per-unit motivation
3. Per-unit introduction
4. Mono-phase system
5. Three-phase system
6. Base change
7. Transformers, motors, power factor
8. Complete analysis

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