Answer Posted / adil yousuf

Ans ; The negative phase sequence
current will flow due to diffence of three phase volages of
the system.If no difference of R Y B voltage is present,
the negative sequence current will not flow.
In rotating machines an unbalance voltage or current in one
phase winding due to elctrical faults or uneven load
further exacerbates the problem. The magnetic coupling
between the winding becomes uneven.
when subject to unbalance conditions, negative phase
sequence currents produce a counter rotating megnatic field
withrespect to the main field.
The resultant field rotates at double frequency and causes
underirable eddy-currents to flow in various structure such
as the machine rotor body , excitaation winding, stator end
winding and stator iron etc.

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