Transformer step-up to step-down setup
Transformer step-up to step-down setup
(OP)
I have a transformer setup that has a 3000 kVA 480V Delta to 4160/2400V Wye step-up dry-type transformer hooked up to a 4160V Delta to 480V Wye step down oil type transformer. I believe this configurations is fine but I am getting feedback from the manufacturer that the setup of the step-up transformer should be switched (480V Wye to 4160/2400V Delta instead of a 480V Delta to 4160/2400V Wye). I am fairly sure it doesn't matter but is there a reason why they might suggest the Wye Delta configuration?
Thanks for any insight and help!
Thanks for any insight and help!






RE: Transformer step-up to step-down setup
old field guy
RE: Transformer step-up to step-down setup
Thanks for the feedback.
Are you saying that the wye-delta configuration is the better way for the step-up? I had thought that the single ground fault detection was better for a wye on the secondary side of the step up.
RE: Transformer step-up to step-down setup
old field guy
RE: Transformer step-up to step-down setup
Thanks again!
RE: Transformer step-up to step-down setup
In terms of providing an appropriate protection arrangement for the overall system, its very important. oldfieldguy has an accurate summary of being able to detect ground faults on the relevant sections of the network. There is a general expectation, as most people are familiar with step down arrangements, that the delta is always on the high side, as this is what is most commonly found. High side delta is a lot more common as a result, but it doesn't necessarily mean its correct for your application.
RE: Transformer step-up to step-down setup
RE: Transformer step-up to step-down setup
Shame on the mfg for not telling you why.
ice
Harmless flakes working together can unleash an avalanche of destruction
RE: Transformer step-up to step-down setup
But most transformers used in industry are step down. Delta:wye works fine.
These will work for step up, but you open the door to the potential issues.
An option may be to use a bank of single phase transformers in delta:wye.
Bill
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"Why not the best?"
Jimmy Carter