Question

A 100-kVA, 277/8000-V single-phase transformer has the following resistances and reactance: $R_p = 0.005 \Omega$ $X_p = 0.006 \Omega$ $R_s = 5 \Omega$ $X_s = 6 \Omega$ $R_c = 60 \Omega$ $X_m = 12 \Omega$ The excitation branch impedances ($R_c$ and $X_m$) are given referring to the low-voltage side of the transformer. a) Determine the equivalent circuit referred to high-voltage side of the transformer (5 marks) b) Determine the primary and secondary currents when no-load is connected to the secondary side. Comment on the difference. (5 marks) c) A load of $100 \angle 15^\circ \Omega$ is connected to the secondary side of the transformer. Determine the primary current, secondary current and efficiency of the transformer. (5 marks)

          A 100-kVA, 277/8000-V single-phase transformer has the following resistances and reactance:
$R_p = 0.005 \Omega$
$X_p = 0.006 \Omega$
$R_s = 5 \Omega$
$X_s = 6 \Omega$
$R_c = 60 \Omega$
$X_m = 12 \Omega$
The excitation branch impedances ($R_c$ and $X_m$) are given referring to the low-voltage side of the
transformer.
a) Determine the equivalent circuit referred to high-voltage side of the transformer (5 marks)
b) Determine the primary and secondary currents when no-load is connected to the secondary
side. Comment on the difference.
(5 marks)
c) A load of $100 \angle 15^\circ \Omega$ is connected to the secondary side of the transformer. Determine the
primary current, secondary current and efficiency of the transformer.
(5 marks)

A 100-kVA, 277/8000-V single-phase transformer has the following resistances and reactance:
Rp = 0.005 Ω
Xp = 0.006 Ω
Rs = 5 Ω
Xs = 6 Ω
Rc = 60 Ω
Xm = 12 Ω
The excitation branch impedances (Rc and Xm) are given referring to the low-voltage side of the
transformer.
a) Determine the equivalent circuit referred to high-voltage side of the transformer (5 marks)
b) Determine the primary and secondary currents when no-load is connected to the secondary
side. Comment on the difference.
(5 marks)
c) A load of 100 ∠ 15^∘Ω is connected to the secondary side of the transformer. Determine the
primary current, secondary current and efficiency of the transformer.
(5 marks)

Added by Paula G.

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