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Discussion Starter · #1 ·
Yesterday I had an emergency call for a 34.5 Wye (3-wire) to 208/120 Wye (4-wire) Transformer, with secondary voltage issues.

While this had nothing to do with the problem I had it is a question I have regarding the transformer


Typically distribution transformers we deal with are Delta/Wye, I have run across this before at higher voltages a few times in the past and was wondering is there an advantage to a Wye/Wye at higher voltages?

The voltage issue with the transformer in question was an open secondary winding.
 

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That's actually what I thought this was gonna be about.

The Why's of Wyes.


The biggest reason I know that utilities like wye-wye connections is it eliminates any possibility of ferroresonance when it's switched by single cutouts. The only other way to protect against that is to put in a gang switch that opens all the lines at once, or to put in chain grounds on one of the delta phases.

What was the voltage problem you had on your call?
 
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