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A 200 KVA, single phase two-winding transformer rated 4160/ V, 60 Hz has primary and second impedances of 0.09 + j 0.9 ohms and 0.02 + j 0.2 ohms respectively. The full-load copper loss is measured to be 5000 W during operations. The core loss is 650 W when a voltage of 2200 V, 50 Hz is applied to the transformer and 210 W at 1200 V, 25 Hz. Calculate: a. The core loss at normal operation and the maximum and full-load efficiency both at 0.9 power factor. b. The percent voltage regulation when connected as an autotransformer, full-load 0.8 power factor lagging. Also compute current at the common winding. The two-winding percent regulation when the power factor is 0.7 leading. C. in

A 200 KVA, single phase two-winding transformer rated 4160/ V, 60 Hz has primary and second impedances of 0.09 + j 0.9 ohms and 0.02 + j 0.2 ohms respectively. The full-load copper loss is measured to be 5000 W during operations. The core loss is 650 W when a voltage of 2200 V, 50 Hz is applied to the transformer and 210 W at 1200 V, 25 Hz. Calculate: a. The core loss at normal operation and the maximum and full-load efficiency both at 0.9 power factor. b. The percent voltage regulation when connected as an autotransformer, full-load 0.8 power factor lagging. Also compute current at the common winding. The two-winding percent regulation when the power factor is 0.7 leading. C. in

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
Section: Chapter Questions
Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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A 200 KVA, single phase two-winding transformer rated 4160/230 V, 60 Hz has primary and second impedances of 0.09 + j 0.9 ohms and 0.02 + j 0.2 ohms respectively. The full-load copper loss is measured to be 5000 W during operations. The core loss is 650 W when a voltage of 2200 V, 50 Hz is applied to the transformer and 210 W at 1200 V, 25 Hz. Calculate: a. b. C. The core loss at normal operation and the maximum and full-load efficiency both at 0.9 power factor. The percent voltage regulation when connected as an autotransformer, full-load 0.8 power factor lagging. Also compute current at the common winding. The two-winding percent regulation when the power factor is 0.7 leading. d. If another 100-KVA, 60 hz, single phase is connected in parallel with it to supply a load of 250 KVA, 0.8 power factor lagging. The primary and secondary impedances of the new transformer is 0.085 + j 0.25 ohms and 0.035 +j 0.22 ohms respectively. horing of each transformer ou
Transcribed Image Text:A 200 KVA, single phase two-winding transformer rated 4160/230 V, 60 Hz has primary and second impedances of 0.09 + j 0.9 ohms and 0.02 + j 0.2 ohms respectively. The full-load copper loss is measured to be 5000 W during operations. The core loss is 650 W when a voltage of 2200 V, 50 Hz is applied to the transformer and 210 W at 1200 V, 25 Hz. Calculate: a. b. C. The core loss at normal operation and the maximum and full-load efficiency both at 0.9 power factor. The percent voltage regulation when connected as an autotransformer, full-load 0.8 power factor lagging. Also compute current at the common winding. The two-winding percent regulation when the power factor is 0.7 leading. d. If another 100-KVA, 60 hz, single phase is connected in parallel with it to supply a load of 250 KVA, 0.8 power factor lagging. The primary and secondary impedances of the new transformer is 0.085 + j 0.25 ohms and 0.035 +j 0.22 ohms respectively. horing of each transformer ou
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