Answer Posted / guest

syn speed = Ns = 120*F/p ;
where F: frequency and p: no. of poles.

so, F = Ns*p/120.

frequency depends on speed of primemover and no. of rotor
poles.speed of turbine is 3000rpm for 2 poles, 1500 for 4
pole, 750 for 8 pole these r stds

so we have std frequency 50 hz std

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