The complete emf waveform for three phase system is shown below with corresponds to the angle and magnitude.
Three Phase Voltages (emf)
a) Three phase vector diagram
Alternating voltages may be represented by revolving vectors which indicate their maximum value(or r.m.s values if desired).The actual values of these voltages vary from peak positive to zero and peak negative values in one revolution of the vectors. In Figure 1.1.2 (g) are shown the three vectors representing the voltages of the three phases eR, eY and eB. Remember, R is the reference; therefore its vector is placed on the 00 plane of x-axis. This vector diagram is rotated to the position where R is on the vertical y-axis to make better understanding as in Figure 1.1.2 (h). The phase different still 1200 apart.
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| (g) geometri arrangemenT |
| (h) conventional arrangement | |||||||||||||
