The input power was very low but with a three phase supply and a modified wave form, I can tell you that it was intentionally done to reduce the input, not to make the test work.
***Horse manure. Asked & answered on this extensive thread at Vortex.
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Does not matter whats on that post...I know what I am talking about. There was no need for three phase power except to reduce the watts/per hour load reading. A single phase set up would have been more than sufficient but three phase on a resistive load is far more economical power wise.
If the voltage is European...it’s running at about 250VAC. Same power we use here in the US on our AC and Heating loads and we do this for economy over 120VAC...We take a second step to lower costs by installing a three phase service which reduces the load at the input by about one third.
So in the end, in the US, you can save from 55-66% by switching your high load devices to three phase but it’s expensive up front.
In the case of this lab, not sure where they got it from because their load is so small that nobody would suggest a three phase set up for it. It’s stupid to have to supply that kind of hardware for a load with less than 5KW. This load was less than 500 watts. That’s like 4 light bulbs.
So the three phase load is pointless! The waveform modification is pointless on a heating element!
Unless you are trying to shave every single bit of inefficiency from the test data to enhance it. Or that power is doing something else, but I am not going there.
There is enough secret sauces in this thing to win a cooking contest.
It’s that simple.