A 3-phase, 10 KVA, 400V, 4-pole, 50 Hz, Delta connected synchronous machine has negligible stator winding resistance and Xs = 6Ω/phase at rated voltage. The machine is operated as a generator in parallel with a 3-phase 400V, 50 Hz supply.i) Determine the excitation voltage (Et) and the power angle (s) when the machine is delivering rated KVA at 0.85 p.f. lagging. Draw the appropriate phasor diagram for this condition. ii) The maximum torque developed by the prime-mover. iii) If the field current is now decreased by 15% (without changing the prime-mover power), find the stator current and p.f. A 3-phase, 10 KVA, 400V, 4-pole, 50 Hz,Delta connected synchronous machinehas negligible stator winding resistanceand Xs = 60/phase at rated voltage. Themachine is operated as a generator inparallel with a 3-phase 400V, 50 Hzsupply.i) Determine the excitation voltage (Et)and the power angle (s) when themachine is delivering rated KVA at 0.85p.f. lagging. Draw the appropriate phasordiagram for this condition.ii) The maximum torque developed bythe prime-mover.iii) If the field current is now decreasedby 15% (without changing theprime-mover power), find the statorcurrent and p.f.

First, we need to calculate the per phase values. The rated line voltage is 400V for a delta…

Answered: A 3-phase, 10 KVA, 400V, 4-pole, 50 Hz,…

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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A 3-phase, 10 KVA, 400V, 4-pole, 50 Hz, Delta connected synchronous machine has negligible stator winding resistance and Xs = 6Ω/phase at rated voltage. The machine is operated as a generator in parallel with a 3-phase 400V, 50 Hz supply.

i) Determine the excitation voltage (Et) and the power angle (s) when the machine is delivering rated KVA at 0.85 p.f. lagging. Draw the appropriate phasor diagram for this condition.

ii) The maximum torque developed by the prime-mover.

iii) If the field current is now decreased by 15% (without changing the prime-mover power), find the stator current and p.f.