1. Consider a single-phase transformer with the following specifications. 20 kVA, 1200 V/120 V, 60 Hz Series impedance: 0.02+j0.04 pu Core loss: 0.01 pu; Magnetization current: 0.05 pu
1. Consider a single-phase transformer with the following specifications. 20 kVA, 1200 V/120 V, 60 Hz Series impedance: 0.02+j0.04 pu Core loss: 0.01 pu; Magnetization current: 0.05 pu
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Transcribed Image Text:1. Consider a single-phase transformer with the following specifications.
20 kVA, 1200 V/120 V, 60 Hz
Series impedance: 0.02+j0.04 pu
Core loss: 0.01 pu;
Magnetization current: 0.05 pu
(1-a) Determine its efficiency at rated 0.8 PF lagging operation.
(1-b) Determine the voltage regulation at rated 0.8 PF lagging operation.
(1-c) Determine the rated magnetization current on HV side in amperes.
(1-d) Determine the amount of series impedance on LV side in ohms.
(1-e) Determine the rated copper loss and core loss in watts.
(1-f) Determine the amount of magnetization inductance (in H) on LV side.
(1-g) Determine the percentage flux leakage.
(1-h) Determine the rated peak flux linkage of primary wining if secondary is
open-circuit. Find it without and with considering the leakage.
(1-i) Determine the rated excitation current on HV side in amperes.
(1-j) Determnine the rated currents on both sides in amperes.
(Note: All the ac variables are rms values unless specified otherwise.)

Transcribed Image Text:1. Consider a single-phase transformer with the following specifications.
20 kVA, 1200 V/120 V, 60 Hz
Series impedance: 0.02+j0.04 pu
Core loss: 0.01 pu;
Magnetization current: 0.05 pu
(1-a) Determine its efficiency at rated 0.8 PF lagging operation.
(1-b) Determine the voltage regulation at rated 0.8 PF lagging operation.
(1-c) Determine the rated magnetization current on HV side in amperes.
(1-d) Determine the amount of series impedance on LV side in ohms.
(1-e) Determine the rated copper loss and core loss in watts.
(1-f) Determine the amount of magnetization inductance (in H) on LV side.
(1-g) Determine the percentage flux leakage.
(1-h) Determine the rated peak flux linkage of primary wining if secondary is
open-circuit. Find it without and with considering the leakage.
(1-i) Determine the rated excitation current on HV side in amperes.
(1-j) Determnine the rated currents on both sides in amperes.
(Note: All the ac variables are rms values unless specified otherwise.)
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