Drive Isolation Transformers
Drive Isolation Transformers
(OP)
I have always specified Delta/Wye connected transformers for DC Drive Isolation applications. All transformer manufacturers, that I am aware of, also specify Delta/Wye connected transformers for this application. I recall hearing that this connection cancels some of the harmonics generated by the drive in the Delta connected primary.
We have a customer who would like to use an existing Delta/Delta transformer for this type of an application. How would a Delta/Delta transformer performance compare to a Delta/Wye for drive isolation?
Thanks for any comments or info.
We have a customer who would like to use an existing Delta/Delta transformer for this type of an application. How would a Delta/Delta transformer performance compare to a Delta/Wye for drive isolation?
Thanks for any comments or info.






RE: Drive Isolation Transformers
If there are more than one drive, then the transformer connection can make a difference. By using a delta-delta and a delta-wye on two identical 6-pulse drives, the combination acts similar to a 12-pulse drive so most harmonics below the 11th are reduced or cancelled. In particular, the 5th and 7th harmonics for this arrangement would be substantially reduced. But that only works if both drives are running at about the same level.
RE: Drive Isolation Transformers