1. EE 740 Professor Ali Keyhani Lecture #6 Load-Tap-Change Transformer (LTC)

5. 10 3.81x 338.1x 3 LVHV 10% 30 MVA 10 Z L =6.887 j.10 Sb=30 38.13.811 phase Eq. Ckt.

6. 10 Y-Y 38.13.81 10 38.1/3.81 10% 10 MVAZ L =6.887 pu Sb=10 j.10 Vb HV =38.1 Vb LV =3.81

7. 10/3 Y-Y 38.13.81 10/3 38.1/3.81 10% 10 MVA Sb=10 65.9/6.59 30 MVA

8. 10 Y- 38.13.81 10 38.1/3.81/ 3 10% 10 MVA20.667 Sb=10 j.10 65.9/3.81 30 MVA 10%

9. Y-Y 10 10/3 65.9/6.59 30 MVA 10% 2.296 j.10 Sb = 30 MVA Vb HV (L-L) Vb L (L-L)

10. 10 3.81x 338.1x 3 LVHV 10% 30 MVA Z L =6.887 j.10 Sb=30