lecture17

lecture17 - © March 2004 Power Systems I 1 Equivalent...

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Unformatted text preview: © March 2004 Power Systems I 1 Equivalent Series Impedance: Transformer bank of three single-phase transformers Three-phase transformer with a three-leg core Wye-Delta Wound Transformers Wiring connection will always cause a phase shift Positive Sequence rotates by a +30 degrees from HV to LV side Negative Sequence rotates by a -30 degrees from HV to LV side Zero Sequence does not rotate Z Z Z Z = = = 2 1 Transformers Z Z Z Z Z > = = 2 1 © March 2004 Power Systems I 2 Zero-Sequence in a Transformer Dependent on the winding connection on each side wye or delta Dependent on the ground connection ungrounded or grounded Types of connections wye-grounded to wye-grounded wye-grounded to wye wye-grounded to delta wye to wye wye to delta delta to delta © March 2004 Power Systems I 3 Zero-Sequence in a Transformer wye-grounded to wye-grounded wye-grounded to wye wye-grounded to delta © March 2004 Power Systems I 4 Zero-Sequence in a Transformer wye to delta delta to delta wye to wye © March 2004...
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lecture17 - © March 2004 Power Systems I 1 Equivalent...

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