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ADC sampling rate selection

Prodigy 120 points

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Hi,

I am going to to design a AC mains voltage measurement system.Tthe input specifications are as given below

Input Voltage- 230Vrms 50Hz

Harmonics to be measured- up to 15th Harmonics

I need to know what should be my sampling rate to measure AC signal of 50HZ with up to 15th Harmonics.

The max input frequency is 50*15= 750Hz

As per nyquist criteria Fs min = 750*2= 1500Hz

But what should be the optimum sampling rate-  is it as per nyquist criteria or more than that.

How to find out optimum sampling frequency ? (Minimum and maximum) and how to select adc as per sampling rate specification.

Thanks and Regards,

Swaminath

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