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lecture17 - Transformers Equivalent Series Impedance...

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© March 2004 Power Systems I 1 circle6 Equivalent Series Impedance: rhombus6 Transformer bank of three single-phase transformers rhombus6 Three-phase transformer with a three-leg core circle6 Wye-Delta Wound Transformers rhombus6 Wiring connection will always cause a phase shift rhombus6 Positive Sequence rotates by a +30 degrees from HV to LV side rhombus6 Negative Sequence rotates by a -30 degrees from HV to LV side rhombus6 Zero Sequence does not rotate l Z Z Z Z = = = 2 1 0 Transformers l l Z Z Z Z Z = = 0 2 1
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© March 2004 Power Systems I 2 Zero-Sequence in a Transformer circle6 Dependent on the winding connection on each side rhombus6 wye or delta circle6 Dependent on the ground connection rhombus6 ungrounded or grounded circle6 Types of connections rhombus6 wye-grounded to wye-grounded rhombus6 wye-grounded to wye rhombus6 wye-grounded to delta rhombus6 wye to wye rhombus6 wye to delta rhombus6 delta to delta
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© March 2004 Power Systems I 3 Zero-Sequence in a Transformer wye-grounded to wye-grounded wye-grounded to wye wye-grounded to delta
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© March 2004 Power Systems I 4 Zero-Sequence in a Transformer wye to delta delta to delta wye to wye
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