EBK POWER SYSTEM ANALYSIS AND DESIGN
EBK POWER SYSTEM ANALYSIS AND DESIGN
6th Edition
ISBN: 9781305886957
Author: Glover
Publisher: CENGAGE LEARNING - CONSIGNMENT
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Chapter 5, Problem 5.11P

A 40-km, 220-kV, 60-Hz, three-phase overhead transmission line has a per-phase resistance of 0.15 Ω /km, a per-phase inductance of 1.3263 mH/km, and negligible shunt capacitance. Using the short line model, find the sending-end voltage, voltage regulation, sending-end power, and transmission line efficiency when the line is supplying a three-phase load of (a) 381 MVA at 0.8 power factor lagging and at 220 kV and (b) 381 MVA at 0.8 power factor leading and at 220 kV.

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Here the Req is 8 my prof solved it and got R3 is parallel to R4 in series with R2 and this combination is parallel to R1. i don't understand how he got these relationships. initially i did the opposite i took (R1//R4 + R2 ) + R3 but got the wrong answer why is it wrong? can you explain to me if there's a trick i can do to understand these questions better and know the configurations of the resistors in a better manner?
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