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Salty Member
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I did not think the transformer needed it, but thought I might be missing a code requirement to pull it. I understand that I will be deriving a neutral on the transformer.
A delta - wye transformer will not need a neutral on the supply and only needs a neutral on the load side if you want to.

A wye - wye transformer would require a neutral on the supply side and only needs a neutral on the load side if you want to.
 

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Discussion Starter · #10 ·
BBQ said:
A delta - wye transformer will not need a neutral on the supply and only needs a neutral on the load side if you want to. A wye - wye transformer would require a neutral on the supply side and only needs a neutral on the load side if you want to.
No problem feeding 480 delta transformer from 480 wye service- correct?
 

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Electron Factory.Worker
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361 Posts
Which begs the question, when would a wye primary transformer be required?
Why wye? Wye primaries are often used on large substation class transformers. 1 reason is the closer you get to the star point the lower your voltage is to ground therefore requiring less insulation and the windings can be closer to the transformer can. Another reason is that by having the neutral it gives you more options for your protective relaying of the transformer. Wyes also handle unbalanced loads better which for all these reasons that pretty much all utility generators are wye connected.
 

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Donuts > Fried Eggs
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Which begs the question, when would a wye primary transformer be required?
There's no requirement. The only time I've seen it at less than 600V is when someone is reverse feeding a ΔY transformer to use it as a step-up, in which case you just float the wye.
 
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