The synchronous generator in the given figure is operating at rated MVA, 0.75 pf lagging and at 8% above rated voltage when a bolted three-phase short circuit occurs at bus 1. Calculate the per-unit values of (a) subtransient fault current; (b) subtransient generator and motor currents, neglecting prefault current; and (c) subtransient generator and motor currents including prefault current. T1 2 XLine = 202 120MVA M)'6.9KV Xã = jo15 120MVA 120서 VA 138KV/138 KV X - jo•15 120MVA 13.8 KV 13.8 KV/138 KV x" = jo•2 X = j0.10 www

The synchronous generator in the given figure is operating at rated MVA, 0.75 pf lagging and at 8% above rated voltage when a bolted three-phase short circuit occurs at bus 1. Calculate the per-unit values of (a) subtransient fault current; (b) subtransient generator and motor currents, neglecting prefault current; and (c) subtransient generator and motor currents including prefault current. T1 2 XLine = 202 120MVA M)'6.9KV Xã = jo15 120MVA 120서 VA 138KV/138 KV X - jo•15 120MVA 13.8 KV 13.8 KV/138 KV x" = jo•2 X = j0.10 www

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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Q2/The positive-sequence reactances for the power system shown in Figure are in per unit on a common MVA base. Resistances are neglected and the negative-sequence impedances are assumed to be the same as the positive-sequence impedances. A bolted line-to-line fault occurs between phases b and c at bus 2. Before the fault occurrence, all bus voltages are 1.0 per unit. Obtain the positive sequence bus impedance matrix. Find the fault current, the three-phase bus voltages during fault, and the line currents in each phase. T₁ 1 0.15 उह 3 X=j0.05 G₁ j0.6 j0.3 2 T2 j0.05 X=j0.05 G₂
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