Draw per-unit zero-negative and positive sequence networks

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Reference no: EM13254827

Three single-phase, two-winding transformers, each reated 450 MVA, 20 kV/288.7 kV with leakage reactance Xeq=0.12 per unit, are connected to form a three-phase bank. The high voltage windings are connected in Y with solidly grounded neutral. Draw the per-unit zero, negative, and positive sequence networks if the low-voltage windings are connected:

A) in delta with American standard phase-shift

B) in Y with an open neutral

C) in Y with grounded neutral. Use the transformer ratings as the base quantites. Winding resistance and excitation current are negligible.

Reference no: EM13254827

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