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Power System Analysis and Design (MindTap Course List)

6th Edition

ISBN:9781305632134

Author:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Publisher:J. Duncan Glover, Thomas Overbye, Mulukutla S. Sarma

Chapter3: Power Transformers

Section: Chapter Questions

Problem 3.29P: Consider three ideal single-phase transformers (with a voltage gain of ) put together as ...

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Concept explainers

Single Phase AC Circuit

Alternating Current (AC) is a type of electric power in which the electric current changes, both in magnitude and direction, at regular intervals. This AC Circuits can deliver power in either a Single Phase system or a Three Phase system.

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EXAMPLE 3.4 Per-unit circuit: three-zone single-phase network Three zones of a single-phase circuit are identified in Figure 3.10(a). The zones are connected by transformers T, and T, whose ratings are also shown. Using base values of 30 kVA and 240 volts in zone 1, draw the per-unit circuit and de- termine the per-unit impedances and the per-unit source voltage. Then calculate the load current both in per-unit and in amperes. Transformer winding resistances and shunt admittance branches are neglected. FIGURE 3.10 Zone 1 Zone 2 Zone 3 Circuit for Example 3.4 V, = 220/0° voits muw T, Zload = 0.9 + j0.2 N Xiine = 2 1 30 kVA 20 kVA 240/480 volts 460/115 volts Xeg = 0.10 p.u. Xea = 0.10 p.u. (a) Single-phase circuit loou XT1p.u. jXinep.u. įXT2p.u. loadp.u. |j0.1378 i p.u. j0.10 p.u. j0.2604 p.u. Zioadp.u. = 1.875 + j0.4167 p.u. 0.9167/0° p.u. Zone 1 Zone 2 Zone 3 Voase = 240 volts Vosse2 = 480 voits Voase3 = 120 volts Zoase (240)2 30,000 = 1.92 N Zbase2 (480)2 30.000 - 7.68 Ω Zas3 (120)2…