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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 = 60/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 machine has negligible stator winding resistance and Xs = 60/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.

Introductory Circuit Analysis (13th Edition)
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.

A 3-phase, 10 KVA, 400V, 4-pole, 50 Hz, Delta connected synchronous machine has negligible stator winding resistance and Xs = 60/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.
Transcribed Image Text:A 3-phase, 10 KVA, 400V, 4-pole, 50 Hz, Delta connected synchronous machine has negligible stator winding resistance and Xs = 60/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.
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