A test taken on a 600 MVA, 21 kV, Y connected synchronous generator yields the following results:- 1) Open circuit line voltage is 21 kV for a de field current (Ir) of 1400 A. 2) Using the same de field current (Ir) with the armature terminals short circuit, armature short circuit AC current was 75 kA. a. If armature resistance equal 0.05 Q, calculate the synchronous reactance. b. Calculate the generator voltage regulation if the generator feeds full load with 0.8 lagging PF, 0.8 leading PF, and unity PF.
A test taken on a 600 MVA, 21 kV, Y connected synchronous generator yields the following results:- 1) Open circuit line voltage is 21 kV for a de field current (Ir) of 1400 A. 2) Using the same de field current (Ir) with the armature terminals short circuit, armature short circuit AC current was 75 kA. a. If armature resistance equal 0.05 Q, calculate the synchronous reactance. b. Calculate the generator voltage regulation if the generator feeds full load with 0.8 lagging PF, 0.8 leading PF, and unity PF.
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Transcribed Image Text:A test taken on a 600 MVA, 21 kV, Y connected synchronous generator yields the following
results:-
1) Open eircuit line voltage is 21 kV for a de field current (Ir) of 1400 A.
2) Using the same de field current (Ir) with the armature terminals short circuit, armature
short circuit AC current was 75 kA.
a. If armature resistance equal 0.05 Q, calculate the synchronous reactance.
b. Calculate the generator voltage regulation if the generator feeds full load with 0.8
lagging PF, 0.8 leading PF, and unity PF.
c. Calculate the generator voltage regulation if the generator feeds 40 %full load with 0.8
lagging PF, 0.8 leading PF, and unity PF.
d. Calculate the generator voltage regulation if the generator feeds 60 %full load with 0.95
lagging PF, 0.95 leading PF, and unity PF.
e. Repeat parts a, b, c, d if the generator is delta connections.
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