Base Impedance Calculations

# Base Impedance Calculations - Z Base 3 V ph 2 3 S 1ph = V...

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R eqH.pu R eqL.pu = R eqH.pu R eqH Z BaseH = R eqL V BaseH V BaseL 2 Z BaseH = R eqL V BaseH V BaseL 2 Z BaseL V BaseH V BaseL 2 = R eqL Z BaseL = R eqL.pu = R eqH.pu R eqH Z BaseH = R eqL.pu R eqL Z BaseL = If Impedances are expressed in p.u. the values are the same on either side of the transformer The Ratio of the Base Impedances is the Square of the Turns-Ratio Z BaseH Z BaseL V BaseH 2 VA Base V BaseL 2 VA Base = V BaseH V BaseL 2 = Z BaseH V BaseH I BaseH = V BaseH V BaseH V BaseH I BaseH = V BaseH 2 VA Base = Z BaseL V BaseL I BaseL = V BaseL V BaseL V BaseL I BaseL = V BaseL 2 VA Base = This shows that the base impedance for a 3-phase transformer is the same if the Line-Line & 3-Phase Power or Line-Neutral & Single Phase Power are chosen.
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Unformatted text preview: Z Base 3 V ph ( ) 2 3 S 1ph = V LL 2 S 3ph = Z Base V LL 2 S 3ph = simplifies to Z Base V LL 3 S 3ph 3 V LL = Z Base V LL 3 I = Z Base V ph I = I S 3ph 3 V LL = S 3ph 3 V LL I = Calculation of Base Impedance for 3-Phase Circuits: Z Base V ph 2 S 1ph = simplifies to Z Base V ph S 1ph V ph = Z Base V ph I = I S 1ph V ph = S 1ph V ph I = Calculation of Base Impedance for Single Phase Circuits: Dr. Michael Giesselmann, Feb-06-2008...
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## This note was uploaded on 04/21/2008 for the course EE 4343 taught by Professor Giesselmann during the Spring '08 term at Texas Tech.

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