I have a gap missing in my understand that needs filling so if someone can please help...

If on the LV side of a 1MVA transformer you have a power factor of 0.8.

How would you analyse that on the HV side of the circuit? Does that phase shift get transposed onto the HV side of the transformer windings? Can someone explain the theory of it?

I am interested how you would analyse the HV circuit with a transformer on load compared with say resistive load. Please start with the basics.

Thanks for your help.

 

CB... yes, the primary-side PF will change, but not because of phase-shift.

Instead, the change is influenced by the Xfmr's Cu and Fe losses! These losses, when added to the load's parameters, will 'slightly' change the primary PF!

Using your example of a 1 MVA, 0.8 PF load, connected to the LV side of a Xfmr having an efficiency of say, 98%. Then the Pri'y side PF will drop to 0.79..! The magnitude of the change is inversely related to Xfmr Efficiency!

If you want an example of a typical calculation contact me at:

[email protected]

 

Yes i sincerely need a comprehensive calculation on this power factor issue. Thank U very much as i awaits your response.

[email protected]