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Figure  9-4.-Schematic  diagram  of  a  delta-connected  alternator.
Figure 9-7.-Wiring diagram of the four-wire system in figure 9-6.

Engineering Aid 3 - Beginning Structural engineering guide book
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Figure  9-5.-Y-connected  alternator  (three-phase,  four-wire). STATOR represents the stationary coils of wire in   the   alternator;   the   one   marked   ROTOR represents the coils, which rotate on the armature. You can see that the power is taken off the stator from  three  connections,  which  in  the  drawing form a triangle or delta. All three wires are live (called  HOT)  wires. Figure  9-5  shows  a  Y-connected  alternator (three-phase, four-wire). N represents a common or NEUTRAL point to which the stator coils are all connected. The current is taken off the stator by the three lines (wires), 1, 2, and 3, connected to the stator coil ends; and also by a fourth line, N, connected to the neutral point. Lines 1, 2, and 3  are  hot  wires;  line  N  is  NEUTRAL. The  voltage  developed  in  any  pair  of  wires, or   in   all   three   wires,   in   a   delta-connected alternator   is   always   the   same;   therefore,   a Figure 9-6.-A pictorial view of a four-wire overhead distribution system. 9-4







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