USA Voltages
USA Voltages
(OP)
Guys
I am a little embarassed to ask but I can't work this out at the moment (still new to the USA standard voltages!):
I have a transformer with 240Vac primary to 240Vac/120Vac secondary. I have an unbalanced load. If I measure 50A on L1 with an amp clamp and 10A on L2, what is the primary current if all loads are purely resistive and no losses(for ease)?
Sorry for such a rudimentary question but my head hurts today!
I am a little embarassed to ask but I can't work this out at the moment (still new to the USA standard voltages!):
I have a transformer with 240Vac primary to 240Vac/120Vac secondary. I have an unbalanced load. If I measure 50A on L1 with an amp clamp and 10A on L2, what is the primary current if all loads are purely resistive and no losses(for ease)?
Sorry for such a rudimentary question but my head hurts today!
UPS Service Manager http://www.nolanpower.com





RE: USA Voltages
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: USA Voltages
I got 30 A in my head but took 5 tries with the calculator to verify. Same kind of day as yours Jeff. grin.
Bill
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"Why not the best?"
Jimmy Carter
RE: USA Voltages
What was confusing me was what part of the current was 240V and what was 120V. I now realize that if we take the 10A at 240V we get 2400VA and then the other 40A would have to be at 120V which gives 4800VA. Add them together and we still get 7200VA.
Strange how asking the question always gets it clearer in my head!
UPS Service Manager http://www.nolanpower.com
RE: USA Voltages
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: USA Voltages
RE: USA Voltages
D'oh!
"Dear future generations: Please accept our apologies. We were rolling drunk on petroleum."
— Kilgore Trout (via Kurt Vonnegut)
For the best use of Eng-Tips, please click here -> FAQ731-376: Eng-Tips.com Forum Policies
RE: USA Voltages
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.