Our company is planning to shift to a new site and I was tasked with finding out the required kVA power to install a PMT. I have the kW ratings, amperage, voltage and power factor for all machines and other equipment in use. Using this as a reference, I found the reactive power for all machines, then summed up the total kW ratings, summed the kVAR ratings, and used the power triangle to get the total real power.
Is this method correct? Is it 'accurate'? I was told it is incorrect and I would have to find the real power for the single-phase and three-phase machines separately, and divide the single-phase total power by 3 because it goes into three-wires. This is the first time I am dealing with a real-life design problem so help would be appreciated. If any other details are required please let me know.