34 ALTERNATING GENERATORS AND SYNCHRONOUS MOTORS. 
four phases C,, will equal oe which in this ease equals 107 
amperes. 
The output of the above machine with the open armature 
winding of two independent circuits 
= 1,000 x KVA. = 2F, C, = 2B) C).....2.. (3) 
and with the closed winding 
= 1,000 x KV A. = 4B, C, = 2B) Cysiu.:.). (4) 
63. Three Phase Machines.—In three phase work two prin- 
cipal connections are in use, the star and the delta con- 
5 Z 
SOLAR CONNECTION DELIA CONNECTTON. 
Fies. 21 AND 22.—ARMATURE CIRCUITS OF THREE-PHASE 
ALTERNATORS. 
nections. In a three phase generator which produces a 
terminal pressure of E, volts, with a star connected 
EF 
armature, Fig. 21, the phase voltage E, will equal aa 
volts and the current in each phase C, as well as that in the 
line C, will be the same. 
Supposing that the generator armature is of the delta con- 
nection, Fig. 22, and the line pressure is EF’, volts, then each 
phase winding F, of the armature has to be designed for 
C 
the tension of £, volts and for a current C, of e 
amperes. 
