Figure 9-5.-Y-connected alternator (three-phase, four-wire).

Figure 9-4.-Schematic diagram of a delta-connected alternator.

Figure 9-7.-Wiring diagram of the four-wire system in figure 9-6.

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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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