For a (Delta)-Y connected, 15-MVA, (33: 11 mathrm{kV}) transformer with differential relay protection and (mathrm{CT}) ratios shown

Question:

For a $\Delta$-Y connected, 15-MVA, $33: 11 \mathrm{kV}$ transformer with differential relay protection and $\mathrm{CT}$ ratios shown in Figure 10.52, determine the relay currents at full load and calculate the minimum relay current setting to allow $125 \%$ overload.

image text in transcribed