Answer / ziyad

there is no engineering reason for that.
the reason is economical.
since they start generating by three phase and the following
designs was based on the first models, and it is difficult
to change the system that already exist so they continue to
design three phase generators and transmission systems.

Answer / ben

IN CASE OF 3PHASE SYSTEM,LENGTH OF CONDUCTOR NEEDED IS LESSER,,ALSO REGULATION IS GOOD IF WE USE 3PHASE..

Answer / manikandan

3 phase system generating & transmission is economical,all
the machinerys are working in 3 phase supply ,so why to
generate 4 phse& 5 phase,if generate 4phase the
transmission &distribution is very difficult

Answer / srikant

DEEPAK sir
what r d reasons 4 it being highly efficient.pls ellaborate

Answer / ganesh

because the 3 phase
tends the 120 deg
phase sequence to
the high loads

Answer / ashok mishra

because it is easy as generate as of 120 degree angle

Answer / deepak24

it is because three phase system is most efficient system.

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