# Why Three Phase System Preferred Over Higher Phases?

- Link: https://studyelectrical.com/2014/04/why-three-phase-system-is-used-and-no-higher-phase.html
- Published: 2014-04-13T06:47:00+00:00
- Author: 

A three-phase system is universally employed for a generation, transmission, and
distribution of electric power. There are several reasons for why three-phase systems
are more commonly used over higher phase (four-phase or six-phase) systems. Simply
we can say that a three-phase system is more efficient over other phase systems.

[⌊Electrical Engineering⌉⌊Electrical Engineering⌉[The Increase in efficiency means
an increase in the output power of a machine. The power output of the machine increases
with increasing the number of phases of the system. So the output power of two-phase
is more than that of the single-phase system. Three-phase power output is much higher
than two-phase. Also power output of four-phase and higher than previous ones.

Now one question comes to our mind ‘Why the three-phase system is used over more
efficient four or five-phase systems?’. 

The reason for choosing three-phase is dependent on the percentage of increase in
output power on increasing the number of phases. 

 * **If a two-phase system is employed in a machine the output of the machine increase
   by 41.4% over the single-phase system.**
 * **If a three-phase system is used, a 50% increase is observed in the output of
   the machine.**
 * **If the number of phases in increased from three to a large number, the increase
   in output is only 7%. And it will cause complications.**
 * **Considering the power output, the three-phase system is more economical over
   higher phase systems.**
 * **Two-phase supply and six-phase supply, when required, is obtained from 3 phase
   supply.**

Hence, three-phase systems are most commonly used over higher phase systems.

### Related posts:

No related posts.