- Location
- Connecticut
- Occupation
- Engineer
Forget the the load "end" for a minute. What are the apparent and real power values of each secondary winding?
Each winding would deliver 1040 Watts and 0 Vars to the load. The power factor is still 1.
The circuit in question does not consist of a single resistor. At a minimum it consists of a resistor and _two_ transformer secondary coils.
Yes, I suggested a Wye source. That doesn't change the power factor of the circuit.
The power factor in the resistor is 1; I agree with your calculation above for this _portion_ of the circuit.
The power factor in each of the transformer secondary coils is less than 1.
The unbalanced loading on the three phase source causes this power factor to be present _on the source_.
The power factor of the source as a whole is 1. NO vars are being delivered to the load.
A single phase _resistive_ load will have unity power factor as compared to the line-line voltage, but a 0.86 power factor when referenced to the line-neutral voltages.
The power factor doesn't change with different voltage references. Power factor is the ratio of real power to apparent power. The are 0 vars at the load and there are 0 vars at the "lines," therefore the power factor is 1 at both the load and the "line."
Try this. Add a 5A resistive load connected A-N together with the 10A resistive load connected A-B in the previous example. Both loads are still purely resistive with no reactive power. But in this case, line A current will be 14.55<-9.9 and line B current will be 10<180. Would you suggest that line A and line B have different power factors as well as being different from the loads? Would you suggest that the load from A-N has a non unity power factor with respect to voltage A-B?