36 ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
100 KVA.; and as the same current passes through each 
phase winding as through the mains, the phase voltage 
E, = 400 volts and the current per phase C, = 125 
amperes. Ans. 
If the two phase generator has a closed winding corre- 
sponding to Fig. 20, we apply Equation (4), in which 
case 
fle a: 8) 
oi L4L Lab cgi Nang F 
C 125 
and C= eT sli ak 88 =-C) 3 whence, 
4 X 283 x 88 = 2 X 400 xX 125 = 100 KVA. 
Therefore the phase voltage, E, — 283 volts and the current 
per phase C, = 88 amperes. Ans. 
Three Phase Generators: In the ease of a star connected 
E 
three phase armature, where a E, and Cp, = (, 
we apply Equation (5). 
Substituting the values given, we have: 
3 X 231 X 144.5 = 1.73 x 400 x 144.5 = 100 KVA. 
Therefore, the phase voltage EH, = 231 volts and the three 
phase armature will carry a current of 144.5 amperes. 
Ans. | 
A delta connected three phase armature will generate under 
die C 
the same conditions, a current of only C, with a voltage . 
1.73 
E, = E,, and applying Equation (6), we get, 
3 x 400 X 83.5 = 1.73 x 400 x 144.5 = 100 KVA. 
Therefore the armature current will equal 83.5 amperes 
and the phase voltage 400 volts. Avs. 
66. Winding Used In Modern Practice.—Going into 
details here, it may be mentioned, that practice leans in 
most eases toward the employment of alternators with 
_ ec Am apse) 
