EE1 PEEE Refresher Class Power Part 2 notes by T. Ernst EE1 – Power Part 2 NotesFall 2011, Page 1

Fall 2011, Page 2 EE1 – Power Part 2 Notes Power Transformers Ideal Real Models Impedance Testing Nameplate Data 3-Phase Connections

Fall 2011, Page 3 EE1 – Power Part 2 Notes 2-Winding Ideal Transformer

Fall 2011, Page 4 EE1 – Power Part 2 Notes Ideal Transformer (more than 2 windings)

Fall 2011, Page 5 EE1 – Power Part 2 Notes Models for Real Power Transformer (50 or 60 hz)

Fall 2011, Page 6 EE1 – Power Part 2 Notes Excitation Characteristics and V/Hz Ratio

Fall 2011, Page 7 EE1 – Power Part 2 Notes Transformer Impedance Testing No-load losses [KW]

Fall 2011, Page 8 EE1 – Power Part 2 Notes Transformer Impedance Testing Series Impedance [pu] Full-load losses [KW]

Fall 2011, Page 9 EE1 – Power Part 2 Notes Transformer Impedance Testing

Fall 2011, Page 10 EE1 – Power Part 2 Notes Power Transformer Nameplates Voltage Rating

Fall 2011, Page 11 EE1 – Power Part 2 Notes IEEE/ANSI C

Fall 2011, Page 12 EE1 – Power Part 2 Notes IEEE/ANSI C

Fall 2011, Page 13 EE1 – Power Part 2 Notes IEEE/ANSI C

Fall 2011, Page 14 EE1 – Power Part 2 Notes 1-Phase Transformer E/E 1 GrdY (1 bushing plus grounding lug)

Fall 2011, Page 15 EE1 – Power Part 2 Notes 1-Phase Transformer E/2E (4-bushing) 2E/E (3-bushing)

Fall 2011, Page 16 EE1 – Power Part 2 Notes 3-Phase Transformer E (3-bushings) E 1 Y (3-bushings)

Fall 2011, Page 17 EE1 – Power Part 2 Notes 3-Phase Transformer E 1 Y/E (4-bushings) E/E 1 Y (3-bushing)

Fall 2011, Page 18 EE1 – Power Part 2 Notes 3-Phase Transformer E 1 GrdY/E (4-bushings or 3-bushings plus grounding lug)

Fall 2011, Page 19 EE1 – Power Part 2 Notes Power Transformer Nameplates VA Rating

Fall 2011, Page 20 EE1 – Power Part 2 Notes

Fall 2011, Page 21 EE1 – Power Part 2 Notes Power Transformer Nameplates Impedance Taps

Fall 2011, Page 22 EE1 – Power Part 2 Notes Power Transformer Nameplates Voltage Ratio Turns Ratio

Fall 2011, Page 23 EE1 – Power Part 2 Notes Power Transformer Nameplates Current Ratio Impedance Ratio

Fall 2011, Page 24 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Method to construct the phasor diagram from the wiring diagram (understand the phase shift through the transformer) Method to construct the wiring diagram from the phasor diagram (match transformer connections to existing systems)

Fall 2011, Page 25 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Wye – Wye (subtractive polarity)

Fall 2011, Page 26 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Wye – Wye (additive polarity)

Fall 2011, Page 27 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Delta – Wye (ANSI Standard)

Fall 2011, Page 28 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Delta – Wye (non-standard)

Fall 2011, Page 29 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Delta – Wye (non-standard – alternate method)

Fall 2011, Page 30 EE1 – Power Part 2 Notes 3-Phase Transformer Connections Zig-Zag Grounding

Fall 2011, Page 31 EE1 – Power Part 2 Notes

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Fall 2011, Page 39 EE1 – Power Part 2 Notes