6.30. A 3-phase short-circuit test is performed on a synchronous generator for which the envelope…

6.30.                         A 3-phase short-circuit test is performed on a synchronous generator for which the envelope of the armature current  is shown  in Fig. 6-13.   Given  V0    = 231 V; Iii” = 113 A; Iii' =  117 A; the   steady­

state short-circuit current is  144 A.  Determine  (a) Xd, (b) xd and (c) x:;.

 

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(a)               X    =   Vo  =  231  =  1.6  n

d        id          144

(b)               

117 = 0.368(i – 144)

i = 462 A

and

5   1  _    V0     _   231  _ O        n

xd  - – – – – .

,I         462

1,1

i   (C)               /).j 11  =  0.368( 1

= i)

113 = 0.368(i1 - 462)

iJ = 769 A

and

231  = 03 n

769

 

 

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