SCR current draw

D

Thread Starter

DEC

I have 3 banks of IR heaters. each bank is wired with one phase of the 480 supply or 277vac and to neutral. I want to control these heaters with a 3 phase SCR. My question is how do I find the current draw on the inlet side of the SCR? The total KW is 69KW, 23KW each leg. Since the heaters are using 277vac I can find that easy enough 23kw/277vac = 83A since the heaters are tied to the neutral. But on the inlet side of the SCR it is 480vac. I'm not sure how to calculate current draw.
 
S
It's the same. Let's say you treat it as a single 480V load. Then

I = 69000 / 480 / sqrt(3) = 83A per phase
 
Top