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# lecture5 - EE 740 Professor Ali Keyhani Lecture #5 Three...

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Unformatted text preview: EE 740 Professor Ali Keyhani Lecture #5 Three Phase Transformer Connections and Phase Shift Problem 1: Three single-phase transformers, each rated 127/13.2 kV, 100 MVA with a leakage reactance of ten percent, are connected as a three-phase wye-wye connected bank. Draw the three-phase, single-phase (values specified in ohms) and the per unit equivalent circuit. 13.2 kV 127 kV T1 T2 = T1 T3 = T1 300 MVA Y-Y 219.71/22.83 kV Problem 1: Three single-phase transformers, each rated 127/13.2 kV, 100 MVA with a leakage reactance of ten percent, are connected as a three-phase wye-wye connected bank. Draw the three-phase, single-phase (values specified in ohms) and the per unit equivalent circuit. Zb HV = (Vb HV ) 2 /Sb = 161.29 ZA HV = Zpu x Zb HV = j.10 x 161.29 = 16.129 300 MVA Y-Y 219.71/22.83 kV j16.129 j16.129 j16.129 3-phase Eqt. Ckt. j16.129 100 MVA 127/13.2 kV 10% 1-phase Eqt. Ckt. HV LV j.10 Per-unit Eqt. Ckt. Problem 1: Three single-phase transformers, each rated 127/13.2 kV, 100 MVA with a leakage reactance of ten percent, are connected as a three-phase wye-delta connected bank....
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## This note was uploaded on 07/17/2008 for the course ECE 740 taught by Professor Keyhani during the Fall '07 term at Ohio State.

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lecture5 - EE 740 Professor Ali Keyhani Lecture #5 Three...

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