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Here's the Mathcad file. The Z and R are from a power transformer test report.jghrist, in your Transformer regulation file where did you get your figures for Z and R?
Or were these pulled from an example that you'd done previously?
Could I also ask that you post the original mathcad file (mcd), please.
No, you haven't missed anything. Sending end and receiving end are just generalized circuit analysis terms for V1 (sending end) and V1-IZ (receiving end). Regulation is just a specific formulation of voltage drop for transformers. Magoo2's equation for voltage drop is an approximation that is close most of the time and assumes that the voltage angle doesn't change much and that the magnitude of VS is equal to real part of VS (cosine of the voltage angle difference approximately equals 1 if the angle difference is small). The ABB equation for regulation in my second attachment is a refinement, but still an approximation.Confused, again. Sending end? Receiving end? Regulation? alehman wrong? Why not primary side, secondary side, resistance, reactance, and all the usual stuff?
...the equation of alehman only needs a small modification: Vdrop = |V1| - |V1-IZ|, using complex variables (vector quantities). Or is there something that I have missed?
I don't know why the definition would change when dealing with terminal to terminal (Ø-Ø?) voltages.When measured terminal to terminal,
Vdrop = |VS - VR| = |IZ|
Note that if VS and I are both 1 pu, then this equation is the same as the exact equation for regulation derived in my second July 11 post attachement.And to further confuse things, the IEEE Red Book has the following equation:
Vdrop = |VS| + IRcos(phi) + IXsin(phi) - sqrt[|VS|^2 - (IXcos(phi) - IRsin(phi))^2 ]