Question

IO AS CA I PL frx-9 991ES URR 16 DATU Question 1: The rating of a three phase three winding transformer are: Ve- llo se 4o Primary Secondary Y-connected 10 KV 40 MVA Y-connected 22 KV 40 MVA A-connected Tertiary 4 KV 15 MVA Neglecting winding resistance and exciting Xps= 9.6 % pu on 40 MVA, 110/22 KV Xpt 7.2 % pu on 40 MVA, 110/ 4 KV Xst 12 % pu on 40 MVA, 22/ 4 KV current, the per unit leakage reactance are: a) Determine theper-unit impedances of the transformer,XYand b) Loads of 30 MW at 0.8 pf lagging and 2-j2 2 are connected to the secondary and tertiary sides of the transformer, respectively. Assume the secondary voltage is 19.8 KV. Determine the primary voltage, current and complex power 2 ze [Ps+st pt] ZB 9- loo 9.6 9.6

With steps and explain please

Answer 1

a)

O βe A AV Α ΜΟν Sbare 3-1 υ AΜνΑ ωυ Σ V, -t10 κV ν ΣΕΚV Vba Zps Di096 PE O 012 . ν ZstE 0. Ο12 ΧΑΟ-0-04 Q1 Τ po- ΤοδΗ ΕE Jo018 6.0Υ2 Ζp2 Ψρυ σT 2 0δ ΑΟ075 ρ0 Σ Σ -δ7o072700 Ζia ποΡυτ

with zero winding resistance X_p ,X_S and X_t are same as Z_p ,Z_s , Z_T.

b)
Pags No Veltage Ratio az s0/o.8x10 130 1-89 Y1o 13D T893 36 Rakio cunnt o000 5 30 Y 2.828 het Vs 19-8 11.4-3 kV Is I1 3 4 1-36-90 2 82 439 a02 60.9 A 1 11 43 LO 1893L30 o0 6 1-30 Pe 3 VI 0012 1-91-9 KyA