A delta-wye connected transformer is shown in Figure 2. This is a 128 kV to 345...
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A delta-wye connected transformer is shown in Figure 2. This is a 128 kV to 345 kV transformer, line-line, RMS. The "X" side is connected to the 128 kV source. Xe Ho Xa Ha ell rele Xb Hb ele ell мее ele FIGURE 2. Delta-wye transformer connection of Question 2 (a) What is the turns ratio between the "H" side to the "X" side? Suggestion: to answer this you may need to transform both sides of the transformer to Y or A. (b) Draw phasor diagrams of the primary and secondary voltages. Be sure to get relative phase angles right. (c) If a balanced load draws 100 MVA at 0.8 power factor from the “H” side, what are the currents on both primary and secondary. Assume that Phase A voltage on the "X" side has zero phase angle (that is, use Vax as the phase reference). A delta-wye connected transformer is shown in Figure 2. This is a 128 kV to 345 kV transformer, line-line, RMS. The "X" side is connected to the 128 kV source. Xe Ho Xa Ha ell rele Xb Hb ele ell мее ele FIGURE 2. Delta-wye transformer connection of Question 2 (a) What is the turns ratio between the "H" side to the "X" side? Suggestion: to answer this you may need to transform both sides of the transformer to Y or A. (b) Draw phasor diagrams of the primary and secondary voltages. Be sure to get relative phase angles right. (c) If a balanced load draws 100 MVA at 0.8 power factor from the “H” side, what are the currents on both primary and secondary. Assume that Phase A voltage on the "X" side has zero phase angle (that is, use Vax as the phase reference).
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