Topic: Three Phase Power Supplies
For Electrical Engg (Computer and Electronics)
Three Phase Power Supply
The generators of three power supply are built in such a way that they are producing three alternating currents at the same time. The stator contains 3 coils, they are staged at 120° and the magnet moves past the 3 coins with each full turn and induces three alternating currents, the three-phase current. Its phases differ at 120° towards each other.
Three phase has properties that make it very desirable in electric power systems. Firstly the phase currents tend to cancel one another (summing to zero in the case of a linear balanced load). This makes it possible to eliminate the neutral conductor on some lines; all the phase conductors carry the same current and so can be the same size, for a balanced load. Secondly power transfer into a linear balanced load is constant, which helps to reduce generator and motor vibrations.
Three Phase Transmission
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