Question

A 1\u03c6 transformer has the following nameplate data: 50kVA, 4.16kV/240V, Z = 5%, X/R = 10 Prove that the value of the per unit impedance is the same on the high side as it is on the low side. Do this by first calculating the value of the impedance in ohms on the low voltage side. Then multiply this value by $a^2$ to get the value in ohms on the high voltage side. Determine the (equipment) impedance base on each side of the transformer and then calculate the per unit impedance on each side of the transformer. Using the transformer rating as the system base, calculate the per unit and actual value of short circuit current that would flow if the fault occurred on the low side when the low side is delivering 50kVA at 240V and 0.8 PF LAG and the high side is connected to a 4160V infinite bus on the high side.

          A 1\u03c6 transformer has the following nameplate data:
50kVA, 4.16kV/240V, Z = 5%, X/R = 10
Prove that the value of the per unit impedance is the same on the high side as it is on the
low side. Do this by first calculating the value of the impedance in ohms on the low voltage
side. Then multiply this value by $a^2$ to get the value in ohms on the high voltage side.
Determine the (equipment) impedance base on each side of the transformer and then
calculate the per unit impedance on each side of the transformer.
Using the transformer rating as the system base, calculate the per unit and actual value of
short circuit current that would flow if the fault occurred on the low side when the low side
is delivering 50kVA at 240V and 0.8 PF LAG and the high side is connected to a 4160V
infinite bus on the high side.

A 10̆3c6 transformer has the following nameplate data:
50kVA, 4.16kV/240V, Z = 5%, X/R = 10
Prove that the value of the per unit impedance is the same on the high side as it is on the
low side. Do this by first calculating the value of the impedance in ohms on the low voltage
side. Then multiply this value by a^2 to get the value in ohms on the high voltage side.
Determine the (equipment) impedance base on each side of the transformer and then
calculate the per unit impedance on each side of the transformer.
Using the transformer rating as the system base, calculate the per unit and actual value of
short circuit current that would flow if the fault occurred on the low side when the low side
is delivering 50kVA at 240V and 0.8 PF LAG and the high side is connected to a 4160V
infinite bus on the high side.

Added by Richard H.

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