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Transformers

Modeling: electromagnetic model, electrical modelSingle phase unit basicsThree phase unit basicsSubtractive

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Transformers

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    1. Transformers ECE 592-20 Smart Electric Distribution Systems

    2. Modeling: electromagnetic model, electrical model Single phase unit basics Three phase unit basics Subtractive & additive polarity Useful nameplate information & application Three phase connections Transformer losses Paralleling Advanced topics Ferroresonance Transmission or distribution system backfeed (delta primary) Mag inrush Autotransformers Grounding banks What do we need to know about transformers? Whew�

    3. Transformer model: two-winding transformer

    4. Transformer model: two-winding transformer

    5. Keep your kVA�s and kW�s straight�become a master of the power triangle. Transformers rated in kVA Loads often given in kW, with a power factor Transformer ratings To keep things simple, assume single phase units are nameplated kVA Large three phase units may have extra cooling classes that allow loading over nominal rating Sizing transformers

    6. NOTE�next size down from a 500 is a 300. Sizing transformers: example #1

    7. Sizing transformers: example #1

    8. Basic from the old days: Primary voltage to 120 V secondary (two wire secondary) To serve 120V and 240V loads: 3 wire secondary Center-tapped secondary Single phase transformers

    9. Single phase transformers

    13. Three phase transformers

    14. First depends on customer needs for secondary Primary utility connection on primary next consideration Convenient voltage classes also come into play� Three phase transformer connections

    15. Wye-grounded secondary

    16. Delta secondary

    17. Grounded-wye / grounded-wye

    18. Wye-grounded / Wye-grounded

    19. Delta / wye-grounded

    20. Delta / Wye-grounded

    21. Open Wye / Open Delta

    22. Open wye / Open delta

    23. Floating wye / Delta

    24. Delta / delta

    25. Sizing transformers: example #2

    26. Sizing transformers: example #2

    27. Single phase transformer nameplate

    28. Single phase transformer nameplate

    29. Single phase transformer nameplate

    30. Three phase transformer nameplate

    31. Three phase transformer nameplate

    32. Three phase transformer nameplate

    33. If you can understand and apply phasors for a delta / wye transformer, you can apply this knowledge/technique to other configurations. Polarity, voltage classes, winding configurations ALL MATTER! Let�s looks at three ways to draw a Delta-Wye transformer� Three phase transformer connections: windings, phasors, etc.

    34. Delta-wye transformer: three phase unit

    35. Delta-wye transformer: three phase unit

    36. Delta-wye transformer: three phase unit

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