1. A transformer bank (Figure P31) is formed using three identical single-phase transformers. The primary line-to-line voltage is 12.47kV, and the secondary line-to-line voltage is 208V. IA la 3-phase Ib 50KVA 0.90 pf (lag) 1в Figure P31 a) Calculate the secondary line currents Ia, , and I_[Hint: use a reference of ZVan=0°]: b) Calculate the primary line currents IA, IB, Ic, and the neutral current In. la A 3-phase Ib 50KVA 0.90 pf (lag) Is Figure P32 c) Suppose that the Phase C Transformer is to be removed for service as shown above (Figure P32). Calculate the resulting primary line currents Ia, IB, Ic, and the neutral current In. d) Calculate the minimum required kVA rating for the Phase A and Phase B transformers for the condition of part (c).

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Solve part c & d

1. A transformer bank (Figure P31) is formed using three identical single-phase
transformers. The primary line-to-line voltage is 12.47kV, and the secondary line-to-line
voltage is 208V.
IA
la
3-phase
Ib
50KVA
0.90 pf
(lag)
1в
Figure P31
a) Calculate the secondary line currents Ia, , and I_[Hint: use a reference of ZVan=0°]:
b) Calculate the primary line currents IA, IB, Ic, and the neutral current In.
la
A
3-phase
Ib
50KVA
0.90 pf
(lag)
Is
Figure P32
c) Suppose that the Phase C Transformer is to be removed for service as shown above
(Figure P32). Calculate the resulting primary line currents Ia, IB, Ic, and the neutral
current In.
d) Calculate the minimum required kVA rating for the Phase A and Phase B transformers
for the condition of part (c).
Transcribed Image Text:1. A transformer bank (Figure P31) is formed using three identical single-phase transformers. The primary line-to-line voltage is 12.47kV, and the secondary line-to-line voltage is 208V. IA la 3-phase Ib 50KVA 0.90 pf (lag) 1в Figure P31 a) Calculate the secondary line currents Ia, , and I_[Hint: use a reference of ZVan=0°]: b) Calculate the primary line currents IA, IB, Ic, and the neutral current In. la A 3-phase Ib 50KVA 0.90 pf (lag) Is Figure P32 c) Suppose that the Phase C Transformer is to be removed for service as shown above (Figure P32). Calculate the resulting primary line currents Ia, IB, Ic, and the neutral current In. d) Calculate the minimum required kVA rating for the Phase A and Phase B transformers for the condition of part (c).
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