T/F Differential protection

[speedtronic]

Why CTs are connected in star on T/F delta connected winding side & in delta on T/F star connected winding side for T/F differential protection?

[Alan Anderson]

I don't understand the question. Can you restate it without using abbreviations? "CT" and "T/F" don't mean anything obvious to me.

[speedtronic]

Why Current transformers are connected in star on Transformer delta connected winding side & in delta on Transformer star connected winding side for Transformer differential protection?
(I think its quite clear now)

[Alan Anderson]

Why Current transformers are connected in star on Transformer delta connected winding side & in delta on Transformer star connected winding side for Transformer differential protection?
(I think its quite clear now)

Sorry, I don't find it at all clear. I'm not sure I can even see a question there. It's just a bunch of words that don't seem to form a coherent sentence to me. That might be because I don't know anything about what you're asking, and it's possible that someone else who understands current transformers and star connections would be able to answer you.

[MrForbes]

A schematic (picture) might be helpful.

Also there is a language barrier here.....two people speaking different versions of English.

[Dmentor]

Brings back my old EE classes in college... I think the question is looking for the rationale behind the old rule of thumb that "CTs on any wye winding of a power transformer should be connected in delta, and CTs on any delta winding should be connected in wye". (Replace wye with star if you are in Europe). Try this (http://www.geindustrial.com/industrialsystems/pm/notes/artsci/art11.pdf) reference and see if it doesn't help (starting on page 212)... My apologies if I misinterpreted the question.