I am not an electrical engineer (I did work as an automation technologist a long time ago, but please forgive me my electricity is very rusty). I've been given some data that was measured from a 3-phase delta system using current transformers and voltage leads on a pump system.
The person who gave me it claims that the software for the logger was configured incorrectly, and that the power consumed is half of what it's reading. He insists that the correct way to calculate the power in this situation is to use the averages of the 3 phases (V_avg x I_avg x PF_avg x sqrt(3)). The meter however is using the summation of the three individual phase powers (V1 x I1 x PF1 + ... ).
My question is: should these values not come out to be the same in the end? Should we not be able to calculate the power using both methods?
Any help would be seriously appreciated!!!
WOW Thank you everyone for your quick response! I figured I would attach a sample row of the metering data I have been given, to try and make what I'm working with more clear:
Each of the 3 real channels are measuring a phase voltage, current and power factor - so my approach was to just calculate power using each phase measurement and summing them (much like the meter did). This should remain the same regardless of the way the system is wired right? (same calculation for Wye / Delta?) Again, THANK YOU ALL SO MUCH!