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1. Let a 5-kVA, 400/200 V transformer be approximately represented by a 2 Q reactance referred to a low voltage side. Considering the rated values as base quantities, (a) express the transformer reactance as a per-unit quantity. (b) express the reactance in per-unit quantity for the high voltage side.

1. Let a 5-kVA, 400/200 V transformer be approximately represented by a 2 Q reactance referred to a low voltage side. Considering the rated values as base quantities, (a) express the transformer reactance as a per-unit quantity. (b) express the reactance in per-unit quantity for the high voltage side.

Introductory Circuit Analysis (13th Edition)
Introductory Circuit Analysis (13th Edition)
13th Edition
ISBN:9780133923605
Author:Robert L. Boylestad
Publisher:Robert L. Boylestad
Chapter1: Introduction
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Problem 1P: Visit your local library (at school or home) and describe the extent to which it provides literature...
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1. Let a 5-kVA, 400/200 V transformer be approximately represented by a 2 Q reactance referred to a low voltage side. Considering the rated values as base quantities, (a) express the transformer reactance as a per-unit quantity. (b) express the reactance in per-unit quantity for the high voltage side. 2. The voltage v(t) = 141.4 cos (@t) is applied to a load consisting of a 10 W resistor in parallel with an inductive X1. = »L = 3.77 W. Calculate the real and reactive power absorbed by the load, and the power factor. 3. Table list a 4/0 copper conductor with 12 strands. Strand diameter is 0.3373 cm (0.1328 in. ). For this conductor (a) verify the total copper cross-sectional area of 107.2 mm² (211,600 c.mil) in the table. (b) verify the d.c. resistance at 50° C of 0.1876 W/ km or 0.302 W/ mi. Assume a 2% increase in resistance due to spiraling. (r@20°c = 1.77 x 10* W.m) (c) determine the percent increase in resistance at 60 hz versus d.c. (Reohz, so° c = 0. 1883 W / km) 4. a single-phase, 10-kVA, 200-V, generator has an internal impedance Z, of 2 Q. Using the ratings of the generator as base values, determine the generated per-unit voltage that is required to produce full-load current under the short-circuit condition.
Transcribed Image Text:1. Let a 5-kVA, 400/200 V transformer be approximately represented by a 2 Q reactance referred to a low voltage side. Considering the rated values as base quantities, (a) express the transformer reactance as a per-unit quantity. (b) express the reactance in per-unit quantity for the high voltage side. 2. The voltage v(t) = 141.4 cos (@t) is applied to a load consisting of a 10 W resistor in parallel with an inductive X1. = »L = 3.77 W. Calculate the real and reactive power absorbed by the load, and the power factor. 3. Table list a 4/0 copper conductor with 12 strands. Strand diameter is 0.3373 cm (0.1328 in. ). For this conductor (a) verify the total copper cross-sectional area of 107.2 mm² (211,600 c.mil) in the table. (b) verify the d.c. resistance at 50° C of 0.1876 W/ km or 0.302 W/ mi. Assume a 2% increase in resistance due to spiraling. (r@20°c = 1.77 x 10* W.m) (c) determine the percent increase in resistance at 60 hz versus d.c. (Reohz, so° c = 0. 1883 W / km) 4. a single-phase, 10-kVA, 200-V, generator has an internal impedance Z, of 2 Q. Using the ratings of the generator as base values, determine the generated per-unit voltage that is required to produce full-load current under the short-circuit condition.
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