ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 53 
* 
of all the losses. Table 11 gives the limiting values of 
TABLE 11.—USUAL LIMITS OF ARMATURE COPPER 
LOSSES FOR DIFFERENT SIZES OF ALTERNATORS. 
Output of Alternator. Usual Limits in Per Cent. 
10 KVA, 4.00 to 6.00 
50 xs So. * S060 
100 ” 1-50"" 3200 
200 he 1.20 ** 2:30 
300 fete 315° ** 1.05 
400 ar EIOW* 275 
500 he 1.00 ** 1 50 
750 $e 95 ** 2.30 
1,000 hg 285 1.15 
the copper losses in terms of the generator capacity and 
Fig. 30 indicates the usual average armature losses. 
10000 
Lo. 
L 
ZL 
LOSSES LN HAT ITS 
Pe PRP Crt 
\ 
200500 400 Soe 600 700 800 HC 000 
QOIPUT IN KFA. 
Fie. 30.—AVERAGE ARMATURE CoprpER Loss FOR DIFFERENT 
SIZES OF ALTERNATORS, 
S 
~ 
8 
