# Voltage regulation calculation at Pf.

#### KevinEamon

Joined Apr 9, 2017
281
This guy here is part of a calculation for Voltage Regulation equations on transformers.
Here on the right is a calculation for V1/a
Where the heck is this phase angle of 1.04 coming from?

I've converted these to phasors and complex numbers and tried to calculate, to no avail.

#### KevinEamon

Joined Apr 9, 2017
281
I could use trig to calculate the tan (angle) = tan^-1(4.21/232.9)

Which works... on a unity factor.
On Pf<1. The angles on the phase diagrams are bent at 90 degrees.

#### KevinEamon

Joined Apr 9, 2017
281
Never mind guys panic is off. Forgot to multiply before I added lul - n00b

#### WBahn

Joined Mar 31, 2012
26,398
The problem talks about "from the equivalent circuit", but you haven't shown the equivalent circuit.

#### KevinEamon

Joined Apr 9, 2017
281
All finished Wbahn thank the Lord. Off now for a few weeks... whhhooo! Think I done well today. Power system analyis and few other modules next.

The problem with this is we're not allowed to use calculater, that can calculate polar and complex numbers... yet... so see that V1/a calculation on the right? I was adding V2 to Zeq b4 multiplying the phase current. As I say n00b.... but it' not so easy to see, when you have a string of madness, on your page...

Anyways as I say: "schools out for winter dada!"

Finally I can have my Christmas. And as the old merchant was oft heard to say..." deary, I can tell you indeed, I was very...very drunk