# ee212_4 - EE212 Passive AC Circuits Lecture Notes 4 Click...

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Click to edit Master subtitle style EE212 Passive AC Circuits Lecture Notes 4 Per Unit System 11

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Click to edit Master subtitle style Per Unit (p.u.) System Computations related to power systems involving machines and transformers are often carried out in p.u. system. In p.u. system, power system quantities (such as V, I, R, X, VA, P and Q) are expressed as decimal fractions of chosen base values . p.u values are sometimes expressed in percentage (beween 0 to 100%). Any value can be taken as the Base Value . However, it is chosen to make computation easy. It is usually taken equal to the rating of a machine/transformer in the power circuit. Power equipment impedance ratings are usually given in p.u. (expressed in %) based on their rated voltage and VA.
Click to edit Master subtitle style Advantages of the p.u. System p.u. values of circuit parameters are the same on either side a transformer . We don’t have to worry about circuit parameters being referred to one side or the other. Machines and transformer constants

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## This note was uploaded on 09/25/2010 for the course EE 212 taught by Professor Gander during the Spring '10 term at University of Saskatchewan- Management Area.

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ee212_4 - EE212 Passive AC Circuits Lecture Notes 4 Click...

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