Question on how to correctly show the impedance of a THREE WINDING transformer

[bdn2004]

I'm trying to properly show this DC rectifier transformer in the power model. There's three pics below:

1. The basic model as I've got it so far.
2. The input screen of a three winding transformer.
3. Nameplate of this rectifier transformer.

At the bottom of the nameplate you can see it says 0.01198 ohms is the commutating reactance.
Impedance volts is 11.0 percent.

All the blanks with the red ! have to be filled in...that's my question. Anyone know how to do this from available information ?

 

[bdn2004]

Here's a little more info I've found on how these are wired.

 

[bdn2004]

Here's another document that looks helpful

 

[dpc]

The basic issue is that there are three impedances - one for each pair of windings. There's no standard format for nameplate impedance data for 3-winders at least based on my experience.

My suggestion is to send the data that you have to EasyPower tech support and ask them to help you out. I suspect they will be willing to help if you're a customer.

Dave

 

[bdn2004]

Thanks...Yeah I was going to do that after trying to get this moving along.

What does the term: "Impedance voltage" that's listed on the nameplate mean?

 

[dpc]

It just means the measured impedance. Basically one winding is shorted and increasing voltage applied to the other winding. When rated current is reached, the voltage, as a percentage, is basically equivalent to the impedance. (oversimplified)