Three Phase alternator working in tamil

Three Phase Systems: In general, generation, transmission and distribution of electrical energy are in three phase. Three phase system can be viewed as the combination of three single phase systems with a phase difference of 120° between each winding. Hence, a three phase generating system is formed by three separate windings with 120° phase difference between them. As the windings are made to rotate in a common magnetic field in a three phase generator, three voltages of the same magnitude and frequency but 120° phase difference between each other are produced. The convention adopted to identify each of the phase voltages is: R-red, Y-yellow, and B-blue. Consider three coils RR1, YY1 and BB1 placed in a magnetic field of maximum value of flux Φm Weber is shown in figure (i). Let all the coils rotate in the anticlockwise direction at an angular velocity ω.
According to Faradays law of electromagnetic induction, emfs are induced in the coils RR1, YY1 and BB1. The induced emf in coil YY1 lags behind the induced emf in coil RR1 by 120 and the induced emf in coil BB1 lags behind that in coil by 240.
All the three induced emfs have the same amplitude, same period and frequency.
Thus, the above sets of voltages are called three phase-balanced system of voltages.
The waveforms of the induced voltages.
Expressions for Voltage and Current in a three phase system:
ER = Em sint
EY = Em sin(t-120)
EB = Em sin(t-240)
Expressions for Voltage and Current in a three phase system:
IR = Im sint
IY = Im sin(t-120)
IB = Im sin(t-240)
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