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Answer Posted / iamdon
The generating voltage is limited up to 22kV due to
following reasons.
1)At voltage greater than 22kV, it is not ecomomical to
design the insulation for generator.
2)With the increase in voltage,armature current increases
which causes more loss in winding.So temperature of winding
increases which in turn rise the temperature of machine.So
we need more efficient cooling technique which is again
uneconomical.
Techinacal data:
1)5 degree increase in temperature reduces the life of
insulation by a factor of half.
2)20 degree increase in temperature reduces the insulation
resistance by a factor of half.
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