Finding VARS and PF for open and short circuit test?
Okay, so I'm doing the open and short circuit test and have these values:
Voltage, current and Power.
How do I find the volt-amps reactive and power factor?
Are there different methods for the open/short circuit test?
For Open Circuit, my values were:
For short circuit:
- 8 years agoFavorite Answer
First, what is your device? I assume it is transformer, then you need variable n=Vprimary/V secondary. but it is not provided. suppose n is known variable hen Voc=Vopencircuit=> Z ext = V/I
Rexc=Poc/(Ioc^2); then Xexc=sqrt(Z^2-r^2). You can find the R at secondary by R2=Psc/(Isc^2) the Z2=Vsc/Isc. Z system is known as Zexc//Z2. find angle of Z. from there VAR is found as Vt xI(L) x sin(angle of Z) and PF as cos (angle of Z)