... 19 .9 kV 7.97 kV 200 kVA 2.50 :1 19.9 kV 13 .8 kV 200 kVA 1. 44 :1 Y-∆ 34 .5 kV 7.97 kV 200 kVA 4 .33 :1 ∆-Y 34 .5 kV 13 .8 kV 200 kVA 2.50 :1 ∆-∆ 34 .5 kV 13 .8 kV 34 6 kVA 2.50 :1 open-∆ 19 .9 kV 13 .8 kV 34 6 ... (low-voltage) side is Vbase (15 kV ) = 1. 125 Ω = S base 200 MVA Z base = so REQ = ( 0. 012 ) (1. 125 Ω ) = 0. 0 13 5 Ω X EQ = ( 0.05) (1. 125 Ω ) = 0.05 63 Ω 36 X M = (10 0 ) (1. 125 Ω ) = 11 2.5 Ω The equivalent ... VSC = 16 00 V , I φ ,SC = I SC / = 1. 1547 A , and Pφ ,SC = PSC / = 38 3 W Z EQ = Vφ ,SC 16 00 V = = 13 85 Ω I φ ,SC 1. 155 A θ = cos 1 Pφ ,SC Vφ ,SC I φ ,SC = cos 1 38 3 W = 78.0° (16 00 V ) (1. 155 A...