Lecture07

Lecture07 - Changing Bases The impedances of generators,...

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Page 1 Fundamentals of Power Systems Lecture 7 1 Changing Bases ( )( ) () 2 3 Base LL Base Actual p Base Actual p pu V S Z Z Z Z = = φ 2 3 3 = new Base LL old Base LL old Base new Base pu old pu new V V S S Z Z z The impedances of generators, transformers, transmission lines, and loads are supplied by the manufacturers in per unit based on the equipment’s own rating. z When placing the equipment into a system, the impedance must be converted to the system base Only within one voltage zone! Fundamentals of Power Systems Lecture 7 2 Changing Bases z Voltage, current, and impedance base values change at transformers as they step the voltage up or down. z The power base remains the same across a transformer z The pu values of impedance, voltage, and current across a transformer is independent of the reference side: primary or secondary
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Page 2 Fundamentals of Power Systems Lecture 7 3 Example A one-line diagram of a three-phase power system is shown. Draw the
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This note was uploaded on 11/10/2011 for the course EEL 3216 taught by Professor Brooks during the Fall '08 term at FSU.

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Lecture07 - Changing Bases The impedances of generators,...

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