Question 3 H A two-winding transformer rated at P = 90 kVA, V₁ /Vµ = 240/1200 V, ƒ = 60 Hz. When this two-winding transformer operates at rated load and power factor pf 0.8, its efficiency is 90%. (1) Calculate the primary currents on the low-voltage side ILv and high-voltage side ̵v. = (2) The above transformer is to be connected as an autotransformer, i) calculate the secondary current Isecondary of the autotransformer; ii) draw the relevant diagram and label all relevant currents and voltages if this transformer is to be used as a 1440/1200 V step-down autotransformer in a power distribution system. (3) Calculate the transformer kVA rating when used as an autotransformer. (For this part assume an ideal transformer.)
Question 3 H A two-winding transformer rated at P = 90 kVA, V₁ /Vµ = 240/1200 V, ƒ = 60 Hz. When this two-winding transformer operates at rated load and power factor pf 0.8, its efficiency is 90%. (1) Calculate the primary currents on the low-voltage side ILv and high-voltage side ̵v. = (2) The above transformer is to be connected as an autotransformer, i) calculate the secondary current Isecondary of the autotransformer; ii) draw the relevant diagram and label all relevant currents and voltages if this transformer is to be used as a 1440/1200 V step-down autotransformer in a power distribution system. (3) Calculate the transformer kVA rating when used as an autotransformer. (For this part assume an ideal transformer.)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
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Transcribed Image Text:Question 3
=
H
A two-winding transformer rated at P 90 kVA, V₁/Vµ = 240/1200 V, ƒ = 60 Hz. When this
two-winding transformer operates at rated load and power factor pf = 0.8, its efficiency is 90%.
(1) Calculate the primary currents on the low-voltage side ILv and high-voltage side ϵv.
(2) The above transformer is to be connected as an autotransformer, i) calculate the secondary
current Isecondary of the autotransformer; ii) draw the relevant diagram and label all relevant
currents and voltages if this transformer is to be used as a 1440/1200 V step-down
autotransformer in a power distribution system.
(3) Calculate the transformer kVA rating when used as an autotransformer. (For this part assume
an ideal transformer.)
=
(4) Calculate the total transformer loss Ploss when it operates at rated load and power factor Pf
0.8.
(5) Calculate the efficiency n with the kVA loading of the part (1) and power factor pf = 0.8.
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