Our electric power system utilizes 3 phases for generation, transmission and distribution purposes. On the generating system, a 3 phase alternator is connected to some mechanical turbine which rotates it, the generated electricity is then stepped up to some higher voltage levels for the transmission purposes. The transmission lines are three parallel conductors (each for a single phase). While studying power systems one might consider why to employ 3 phase instead of 6, 12, 18, 36 or any other number of phases.
There are two major reasons which restrict us to 3 phase power systems instead of 6, 12, 18 or 36 phases. Let’s discuss 2 of them.
List of Contents
Increase in transmitted power is not proportionate
By increasing phases, one might think that power carried is proportionate, but that is not the case. For six phases the power is doubled but above than that, it didn’t double instead it now increases by a lower ratio.
It is uneconomical
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