Answer Posted / rohit

it is because of form factor (1.11). form factor is rms value/ avg value. power generated from power stations is avg value. but when it is to be transmitted to distant place it has to be in rms. so in order to find relation between the generated power and transmitted voltage the form factor is considered. it can be further explained as in case of HVDC line the transmitted voltage is not multiple of 11. hence it explains.

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