Three single-phase, two-winding transformers, each rated 450 MVA, (20 mathrm{kV} / 288.7 mathrm{kV}), with leakage reactance (mathrm{X}_{mathrm{eq}}=0.10)

Question:

Three single-phase, two-winding transformers, each rated 450 MVA, \(20 \mathrm{kV} / 288.7 \mathrm{kV}\), with leakage reactance \(\mathrm{X}_{\mathrm{eq}}=0.10\) per unit, are connected to form a three-phase bank. The high-voltage windings are connected in \(Y\) with a solidly grounded neutral. Draw the per-unit equivalent circuit if the low-voltage windings are connected

(a) in \(\Delta\) with American standard phase shift or

(b) in \(\mathrm{Y}\) with an open neutral. Use the transformer ratings as base quantities. Winding resistances and exciting current are neglected.

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Related Book For  book-img-for-question

Power System Analysis And Design

ISBN: 9781305632134

6th Edition

Authors: J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

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