2.20 The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it has a voltage rating of 8.0-kV:78-kV. A short-circuit test from the high-voltage side (low-voltage winding short circuited) gives readings of 4.53 kV, 321 A, and 77.5 kW. An open-circuit test is conducted from the low-voltage side and the corresponding instrument readings are 8.0 kV, 39.6 A, and 86.2 kW. a. Calculate the equivalent series impedance of the transformer as referred to the high-voltage terminals. b. Calculate the equivalent series impedance of the transformer as referred to the low-voltage terminals.
2.20 The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it has a voltage rating of 8.0-kV:78-kV. A short-circuit test from the high-voltage side (low-voltage winding short circuited) gives readings of 4.53 kV, 321 A, and 77.5 kW. An open-circuit test is conducted from the low-voltage side and the corresponding instrument readings are 8.0 kV, 39.6 A, and 86.2 kW. a. Calculate the equivalent series impedance of the transformer as referred to the high-voltage terminals. b. Calculate the equivalent series impedance of the transformer as referred to the low-voltage terminals.
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Question
![2.20 The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it
has a voltage rating of 8.0-kV:78-kV. A short-circuit test from the high-voltage
side (low-voltage winding short circuited) gives readings of 4.53 kV, 321 A,
and 77.5 kW. An open-circuit test is conducted from the low-voltage side and
the corresponding instrument readings are 8.0 kV, 39.6 A, and 86.2 kW.
a. Calculate the equivalent series impedance of the transformer as referred to
the high-voltage terminals.
b. Calculate the equivalent series impedance of the transformer as referred to
the low-voltage terminals.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F148ce718-de18-40bd-97fa-13299dd3ebee%2Fef4a2273-b543-49a7-a521-e66a527b1ebc%2Fkkf1c6_processed.jpeg&w=3840&q=75)
Transcribed Image Text:2.20 The nameplate on a 25-MVA, 60-Hz single-phase transformer indicates that it
has a voltage rating of 8.0-kV:78-kV. A short-circuit test from the high-voltage
side (low-voltage winding short circuited) gives readings of 4.53 kV, 321 A,
and 77.5 kW. An open-circuit test is conducted from the low-voltage side and
the corresponding instrument readings are 8.0 kV, 39.6 A, and 86.2 kW.
a. Calculate the equivalent series impedance of the transformer as referred to
the high-voltage terminals.
b. Calculate the equivalent series impedance of the transformer as referred to
the low-voltage terminals.
![pr
d.
2.26 (a) Determine the efficiency and voltage regulation of the transformer of
Problem 2.20 if it is supplying rated load (unity power factor) at ratcd voltage
at its low-voltage terminals. (b) Repeat part (a), assuming the load to be at 0.9
power factor leading.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F148ce718-de18-40bd-97fa-13299dd3ebee%2Fef4a2273-b543-49a7-a521-e66a527b1ebc%2Fuu07pyo_processed.jpeg&w=3840&q=75)
Transcribed Image Text:pr
d.
2.26 (a) Determine the efficiency and voltage regulation of the transformer of
Problem 2.20 if it is supplying rated load (unity power factor) at ratcd voltage
at its low-voltage terminals. (b) Repeat part (a), assuming the load to be at 0.9
power factor leading.
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