Stevenson J. Power system analysis
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20 CHAER 1 BASIC CONCES
a
b
c
FIGURE 1.17
Phasor diagram of voltages for Example 1.2.
FIGURE 1.18
Phasor diagram of currents fo r Example 1.2.
Balanced loads are often connected in , as shown in Fig. 1.19. Here it is
left to the reader using the properties of the operator a to show that the
magnitude of a line current such as
I
II is equal to times the magnitude of
a-phase current
lab
and that la lags lab by 30° when the phase sequence is
abc. Figure 1.20 shows the current relationships when lab is chosen as refer
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