A 40 MVA, 3-winding transformer has its winding rated as follows: Primary (Y) Secondary (Y) Tertiary 110 KV 22 KV (A) 4 KV Short-circuit test results are: Zps = j 35 Q, Zpt = j 20 Q and Zst = j30 a Calculate the pu impedances of the equivalent circuit. use SB = 40 MVA and VB = 110 KV (primary side). %3D b. Loads of 30 MW at 0.8 pf lagging and 2–j2 N are connected to the secondary and tertiary sides of the transformer, respectively. Assume the secondary voltage is 19.8 KV. Determine the primary voltage Curront ond

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A 40 MVA, 3-winding transformer has its winding rated as follows:
Primary
(Y)
Secondary (Y)
Tertiary (A)
Short-circuit test results are:
110 KV
22 KV
4 KV
Zps = j 35 Q,
Zpt = j 20 Q
Zst = j 3 0
and
Calculate the pu impedances of the equivalent circuit.
use SB = 40 MVA and VB = 110 KV (primary side).
b. Loads of 30 MW at 0.8 pf lagging and 2-j2 Q 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.
Transcribed Image Text:A 40 MVA, 3-winding transformer has its winding rated as follows: Primary (Y) Secondary (Y) Tertiary (A) Short-circuit test results are: 110 KV 22 KV 4 KV Zps = j 35 Q, Zpt = j 20 Q Zst = j 3 0 and Calculate the pu impedances of the equivalent circuit. use SB = 40 MVA and VB = 110 KV (primary side). b. Loads of 30 MW at 0.8 pf lagging and 2-j2 Q 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.
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