ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 33 
responding to Fig. 17, so that the armature current C, is 
identical with that of the line current C). 
If the armature winding is closed, as in Fig. 18, each section 
will carry only one-half of the line current C, and the con- 
ductors are to be dimensioned accordingly, that is, for a 
1 
C 
eurrent equal to 2° 
The output of the above machine, with an open armature 
winding 
aw AV AS BC. = Bee te ok bad (1) 
and with a closed armature winding 
= 1,000 x KVA. = 2H, C, = BE, XC)......-. (2) 
i & Se 
G 
En Ze 
. re C rd : : 
XZ Zr 
OLEW WINDING CLOSED WINDING 
Fies. 19 AND 20.—ARMATURE CIRCUITS OF Two-PHASE 
ALTERNATORS. 
62. Two Phase Machines.—For a two phase generator with 
two independent phases as shown in Fig. 19, the line pres- 
sure #, is equal to the voltage of each phase E, and the 
same current C, passes through each phase winding as 
through the main C;. For instance, in a 600 KVA. two 
phase generator of 2,000 volts terminal pressure, the cur- 
rent will be 150 amperes in each phase. 
If the alternator possesses an armature corresponding to 
Fig. 20, the voltage of each of the four armature sections 
or phases, EF, will equal fe and the current in each of the 
