i have porject to measure the AC power in base sataion of communication system (BTS) so i was looking for method to calculation the power factor.
I found Two ways:
1- three voltmeter method. like in this link : http://www.giangrandi.ch/electronics/cosphi/cosphi.shtml
or using crossing detector to calculator the difference time between voltage / current signals then using math with the frequency to find the power factor.
any advice. any one run any project like this before might share here so I can know more about those methods.
any one know high voltage AC sensors name for the first method.