One of
the main reasons for the larger generators producing voltages not more than
around 22kV is the insulation
restrictions. Higher voltages between the windings require more insulation in
the stator windings which turn out not to be feasible for larger output
voltages.
In case
of a star-connected winding, the line voltage is √3 times the phase voltage.
And the winding insulation depends on the phase voltage levels. For a
delta-connected winding, line voltage is equal to phase voltage. Thus, for the
same line voltage generated, amount of insulation required in a star winding
will be lesser(due to lesser phase voltage) than that required in a delta
winding.
VL =
√3Vp For star connection
VL =
Vp For Delta connection
- Insulation between the winding depends on the voltage levels
- Heating of the winding depends on the current levels.
NOTE: If
you don’t find the answers given by me complete or justified, or want to add your
views to them; you are free to give your own explanations through the comment
section. You can also post your queries on the post.And we shall discuss them here.
