Q. The readings of open circuit, short circuit, and DC bridge tests of 500 V, 50 kVA, 60 Hz three-phase Y-connected alternator are given below:
Open Circuit Terminal Voltage Ea(V)
125 250 370 500 544 640
Short Circuit Current Ia(A)
---- 146 220 ----- ----- -----
Field Current If(A)
5 10 15 20 25 30
DC Bridge test:
Voltage (V): 10.6
Current (A) 26.5
[A] Determine the armature resistance.
[B] Determine the unsaturated synchronous reactance at the rated terminal voltage.​