9.2 THREE-PHASE SOURCES AND THREE-PHASE POWER
Three-phase sources and loads can take two forms – star connected or delta connected. The star connection is also referred to as Y-connection. The delta connection is referred to as ∆-connection or mesh connection.
9.2.1 The Y-connected Source
Two options to construct a three-phase Y-connected source are shown in Fig. 9.2-1.
In Fig. 9.2-1(a) , the terminal identified by Y has a voltage phasor that lags the voltage phasor of the terminal identified as R by 120°. And the terminal identified as B has a voltage phasor that leads the R-line by 120° – i.e., B-line voltage lags R-line voltage by 240°. Thus, similarly located points on the waveform will appear first in R-line, then in Y-line after one-third ...
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