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. L 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 = 180 A.
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. L 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 = 180 A.
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Synchronous Generator
In comparison to an asynchronous generator, it is a machine where the rotor speed is equal to the rotating magnetic field produced by the stator, i.e., mechanical speed is equal to the electrical speed, thus called synchronous, and not asynchronous.
Salient Pole Rotor
Salient pole rotor includes a large number of exposed poles mounted on a magnetic wheel. The construction of a bright pole is as shown in the image on the left. The proposed poles are made of metal laminations. The rotor winding is provided on these poles and is supported by pole shoes.
Question
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.
Ee was measured to be 364 A.
• When 8 VDC was applied two of the terminals, 40 A DC was measured. • When the armature current was 180 A, the internal (torque) angle was 25
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 IA = 180 A.
= 180 A.
Hint: Assume RA << Xs except in part (a).
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