2 Reasons to Emloy 3 Phase Power Systems Instead of 6, 12, 18 or 36 Phases

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.

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

While observing the power systems one might notice the number of busbars, circuit breakers, transmission conductors, bushings on transformers and other power equipment in the yard they are all three in numbers. The number of phases demands a higher number of such equipment which is a very uneconomical task meaning that overall price of installation, generation, protection, operation, and control will be doubled, tripled or quadrupled but the rate of power transmission is not increased. Let’s learn more in this Edisontechcenter’s video:
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