Answer Posted / chandru_williams

I srrongly disagree with Kavitha. Insulators are made only
for the volateg ratings produced ( 11KV). The actual reason
is as follows.





1. When an alternator generates voltage, its rms value is
given by 4.4*f*$*t, where $ is value of total flux per
pole. So we can see all the voltages are made inevitably
multiple of this value (1.1, which is the form factor of
ac wave). Also it provides us the best economic
construction of step up and step down transformers.







2. We always use a multiple of 1.11 bcoz for a pure sine
wave the FORM FACTOR is the ratio of rms value of voltage
or

current with the avg. value of voltage or current and for
pure sine wave rms value of current is Imax/root '2' and

avg. value is 2Imax/pie. and which comes out to be 1.11 so
we cant have a combination of other then a multiple of 1.11.

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