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Thank you for all your imput,this has been a great help.

Raising is refering to the tap position and not the actual voltage

Thanks for your input Wyeman , but you do get negetive PF registering in CT metering

I am involved with CT meter testing,i am now required to prove total power factor using red phase PF and Blue phase individually to calculate the total ,

Thanks for your replies ,what would the calcs be to check the total PF using each individual PF reading.

What calculations do you use to check total PF useing L1,L2,L3 PF readings in LV supply's and L1 and L3 in HV supply's also KW,KVA and KVArh readings are available