240V Corner Grounded Service to 208 Wye transformer.

[markyM]

We have a customer who is looking to purchase this transformer to get 208Wye Service from his 3 Phase 240V Corner Grounded Delta.

https://www.swgr.com/store/dry-type-low-transformer/product/11-4388.aspx

I just wanted to confirm that this would suit his need or if we should just advise him to go with 3 Buck boost transformers instead.

Thank you for your help.

 

[templdl]

We have a customer who is looking to purchase this transformer to get 208Wye Service from his 3 Phase 240V Corner Grounded Delta.

https://www.swgr.com/store/dry-type-low-transformer/product/11-4388.aspx

I just wanted to confirm that this would suit his need or if we should just advise him to go with 3 Buck boost transformers instead.

Thank you for your help.

You can't get 208Y/120 3ph4w from a 240 3ph3w with a B-B because the 240v doen't have a neutral.

 

[augie47]

If you are need 208Y/120, I think you have the correct method.

 

[infinity]

240 Delta to 208Y/120 seems like it would work fine for me.

 

[markyM]

Just to double check since templdl said it would not work, I spoke with customer again and what he has is 240V 3 Phase 3 Wire (no neutral), service that was installed around 25-30 years ago (has separate meter). He called it 240V Corner grounded Delta. Most of their machinery runs fine on it, but they are adding some sensitive packaging equipment that required 208V, so they were going to purchase this transformer.

 

[George Stolz]

He said a buck boost would not work due to the lack of neutral. The transformer you linked to looks like it will do the job nicely.

 

[chris kennedy]

Just out of courisoty what does your customer do for lights and 120V rec's?

 

[kwired]

You could get 208 volts with buck boost units, you just could not get 208/120.

 

[templdl]

He said a buck boost would not work due to the lack of neutral. The transformer you linked to looks like it will do the job nicely.

Yes, you would use a 240 delta-208Y120 isolation transformer which simply has a separate 240 delta primary and 208Y120 secondary winding. A transformer that provides isolation simply put provides a newly derived system for the secondary regardles of the pri-sec ratio where a B-B does not provide isolation. The 240d-208Y120 provides a neutral where a B-B can only provide 240D-208D.

 

[markyM]

Chris Kennedy, customer has a separate service for 120V. I would like to thank everyone for answering my question here.