A simple power system is shown in this Fig. The generator (480 V, 10 kVA) is connected to an ideal step-up transformer (1:20), a transmission line (R=20 Ohm and X=60 Ohm), step down transformer (40:1) and a load (R= 25 Ohm and X=10 Ohm) the base values for this system are chosen to be 480 V and 10 kVA at the generator. Calculate the per unit reactive power for the load. line j60 N load Zyond 20Ω Zine 480 0° v Select one: a. 0.079 b. 1.63 c. 1.33 d. None of the above

A simple power system is shown in this Fig. The generator (480 V, 10 kVA) is connected to an ideal step-up transformer (1:20), a transmission line (R=20 Ohm and X=60 Ohm), step down transformer (40:1) and a load (R= 25 Ohm and X=10 Ohm) the base values for this system are chosen to be 480 V and 10 kVA at the generator. Calculate the per unit reactive power for the load. line j60 N load Zyond 20Ω Zine 480 0° v Select one: a. 0.079 b. 1.63 c. 1.33 d. None of the above

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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Your aunt living in the USA sent an appliance that has impedance equal to 10 + j3 2 at 60 Hz. She instructed you to purchase a 220 V to 110 V transformer to step down the voltage since the appliance is rated 110 V. The cord that you used to connect the 220 V side of the transformer to the convenience outlet has a total impedance of 1 + j0.5 Q. You measured the voltage at the outlet and the value is 220 Vrms. The equivalent circuit is shown below: j0.5 Q 19 ww + (N) 220 V rms 10+ j3 VL Ω 220 V : 110 V Solve for the voltage across the appliance and the current through it by either A. Referring the appliance to the transformer primary, OR B. Referring the source and cord impedance to the transformer secondary. Assign the convenience outlet voltage as the reference phasor, i.e. at 0°. Choose only one method above. After choosing, 1. Draw the circuit that would solve for V₁ and T. Compute all referred values and label all components. 2. Solve for V and I.
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ANSWER ONLY SUBQUESTION 'D' PLEASE. TYIA
In a 100-kVA, 6,000/400-V, Y-Y, 3-ph, 50-Hz transformer, the copper loss is measured at 5000 W during half-load. Apparently, the maximum efficiency also occurs at ¾ full-load, find the efficiencies of the transformer at full-load and at half-load both at 0.8 pf
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