An eight-pole, 50 Hz, A-connected, synchronous generator with a fixed field current of 6 A was tested, and the following data were taken: Vroc Was measured to be 450 V. Isc was measured to be 364 A. When 8 V DC was applied to two of the terminals, 40 A DC was measured. When the armature current was 180 A, the internal (torque) angle was 25°. Find the values of: a) the armature resistance. b) the approximate synchronous reactance. c) the load power factor at IA = 180 A.

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An eight-pole, 50 Hz, A-connected, synchronous generator with a fixed field current of 6 A was
tested, and the following data were taken:
Vr,oc was measured to be 450 V.
IL sc was measured to be 364 A.
When 8 V DC was applied to two of the terminals, 40 A DC was measured.
When the armature current was 180 A, the internal (torque) angle was 25°.
Find the values of:
a) the armature resistance.
b) the approximate synchronous reactance.
c) the load power factor at IA
d) the static stability limit at IA = 180 A.
e) the induced torque at
= 180 A.
= 180 A.
Hint: Assume RA << Xs except in part (a).
Transcribed Image Text:An eight-pole, 50 Hz, A-connected, synchronous generator with a fixed field current of 6 A was tested, and the following data were taken: Vr,oc was measured to be 450 V. IL sc was measured to be 364 A. When 8 V DC was applied to two of the terminals, 40 A DC was measured. When the armature current was 180 A, the internal (torque) angle was 25°. Find the values of: a) the armature resistance. b) the approximate synchronous reactance. c) the load power factor at IA d) the static stability limit at IA = 180 A. e) the induced torque at = 180 A. = 180 A. Hint: Assume RA << Xs except in part (a).
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