Power Equations
Power Equations
(OP)
I have a problem.
We have an unbalanced 3 phase load from 2 distribution boards fed from a 60kVa ups.
Does anyone know of the equation for working out kVa of an unbalanced load from the 3 different line currents. The voltage is 415v (U.K.)
Regards
Gavin
We have an unbalanced 3 phase load from 2 distribution boards fed from a 60kVa ups.
Does anyone know of the equation for working out kVa of an unbalanced load from the 3 different line currents. The voltage is 415v (U.K.)
Regards
Gavin






RE: Power Equations
RE: Power Equations
RE: Power Equations
P(3ph)=Va*Ia*cos(a)+Vb*Ib*cos(b)+Vc*Ic*cos(c)
Q(3ph)=Va*Ia*sin(a)+Vb*Ib*sin(b)+Vc*Ic*sin(c)
Where a is the angle between Va and Ia, b is the angle between Vb and Ib, and c is the angle between Vc and Ic.
RE: Power Equations
RE: Power Equations
http://www.eng-tips.com/faqs.cfm?spid=238&newpid=238&sfid=314
http://grouper.ieee.org/groups/sag/IEEEP1564_00_08.doc
etc. for more info