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Three coils ( Suppose: A, B and C ) are placed at 120 degree from each other in uniform magnetic field. The coils are rotated at uniform angular speed ( Suppose: omega ) ( unit: radian per second ). Emfs are induced in each coil. As coil B is placed at 120 degree from coil A, emf induced in coil B lags behind that of A by 120 degree.
If the three phase voltage are equal in magnitude, the sum of the three phase voltage is zero. This can be shown by different ways. ( e.g. Vector sum ).
The order in which the voltage of the coil reaches to the maximum value is called the phase sequence. ( Phase sequence is of great importance in parallel operation of three phase Transformers and alternators ).
Phase sequence R-Y-B is known as the positive sequence, while R-B-Y is known as the negative sequence.
Phase sequence can be checked by using phase sequence indicator.
Phase sequence can be reversed by interchanging any two terminals.
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