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Fall 2011, Page 2
EE1 – Power Part 2 Notes
• Power Transformers• Ideal• Real Models• Impedance Testing• Nameplate Data• 3-Phase Connections
Fall 2011, Page 8
EE1 – Power Part 2 Notes
Transformer Impedance Testing•Series Impedance [pu]•Full-load losses [KW]
Fall 2011, Page 14
EE1 – Power Part 2 Notes
1-Phase Transformer•E/E1 GrdY (1 bushing plus grounding lug)
Fall 2011, Page 17
EE1 – Power Part 2 Notes
3-Phase Transformer•E1Y/E (4-bushings)
•E/E1Y (3-bushing)
Fall 2011, Page 18
EE1 – Power Part 2 Notes
3-Phase Transformer• E1GrdY/E (4-bushings or 3-bushings plus grounding lug)
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)