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Example: A30,5KVA,208V,60HZ,synchronous machine has negligible stator winding resistance and Xs =80 per phase at rating terminal voltage. The machine is first operated as generator in parallel with a 30,208V,60HZ power supply. Determine: a) The excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition b) If the field excitation current is now increased by 20%,find the stator current ,power factor, and kVA supplied by the machine. Dr Audih 18

Example: A30,5KVA,208V,60HZ,synchronous machine has negligible stator winding resistance and Xs =80 per phase at rating terminal voltage. The machine is first operated as generator in parallel with a 30,208V,60HZ power supply. Determine: a) The excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition b) If the field excitation current is now increased by 20%,find the stator current ,power factor, and kVA supplied by the machine. Dr Audih 18

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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* Field current (E) need to be increase if the machine loss synchronism ?? エP.F, 5, d20% F"-0,8 x Fp Ee - 4,2xEg E= 0,8 xEp UGen. 2 Motor 4 20% é) Hofor I wan 21 Dr Audih
Transcribed Image Text:* Field current (E) need to be increase if the machine loss synchronism ?? エP.F, 5, d20% F"-0,8 x Fp Ee - 4,2xEg E= 0,8 xEp UGen. 2 Motor 4 20% é) Hofor I wan 21 Dr Audih
Example: A30,5KVA,208V,60HZ,synchronous machine has negligible stator winding resistance and Xs =80 per phase at rating terminal voltage. The machine is first operated as generator in parallel with a 30,208V,60HZ power supply. Determine: a) The excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition b) If the field excitation current is now increased by 20%,find the stator current ,power factor, and kVA supplied by the machine. Dr Audih 18
Transcribed Image Text:Example: A30,5KVA,208V,60HZ,synchronous machine has negligible stator winding resistance and Xs =80 per phase at rating terminal voltage. The machine is first operated as generator in parallel with a 30,208V,60HZ power supply. Determine: a) The excitation voltage and the power angle when the machine is delivering rated kVA at 0.8 PF lagging. Draw the phasor diagram for this condition b) If the field excitation current is now increased by 20%,find the stator current ,power factor, and kVA supplied by the machine. Dr Audih 18
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