Transformer Winding Type
Transformer Winding Type
(OP)
Do any of you have any recommendation or idea of which is a better transformer, one with a circular winding or one with a rectangular/ sheet type winding?
Thanks
Thanks
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RE: Transformer Winding Type
(Flame shields up)
My personal opinion is that "circular" core type transformers have been demonstrated to be superior to rectangular core units in withstanding the forces associated with through-faults.
Rectangular core transformers generally have a lower first cost but simply don't hold up as well if you are looking for a 30, 40 or 50 year transformer life.
(shields down)
RE: Transformer Winding Type
Do you have a particular reason for asking?
RE: Transformer Winding Type
It matters to a lot of my industrial (non-utility) clients. I'd have to disagree with your approach to buying transformers in this day and age. Unfortunately, ordering a transformer from GE or ABB, etc does not mean that they will actually build it. In many size ranges they will sub it out and just put their name on it.
RE: Transformer Winding Type
RE: Transformer Winding Type
I believe the primary builder of dry type transformers in the US is ABB, I can't think of any major still building their own.
I still think that for most applications <5000kVA and <35kV whatever is standard is usually fine. Of course special applications (ie.e furnaces) will always need evaluation. This is why it is important for Cabfa to tell us his application
RE: Transformer Winding Type
RE: Transformer Winding Type
Thanks for your replies. The transformer I am looking to buy is a 13.8kV to 4kV delta-wye substation transformer. The transformer will be around 10MVA. I have seen that transformers with rectangular winding appears to be less expensive but I have heard a few bad things about them. I want to be able to buy a lasting transformer that won't be giving us trouble in the near future.
RE: Transformer Winding Type
One supplier used this reasoning to justify its chepaer rectangular windings. Their test results showed no change in impedance before or after the short circuit type test. I don't recall if they were using sheet windings. It was for small to medium (25 MVA) transformers. Square windings allowed a smaller tank and some other savings, according to that supplier.
RE: Transformer Winding Type
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