CT and PT ratings/settings for a new transformer

[sky2020]

I am developing the specs of a new paralleling transformer. Can you advise which documents can I use to help me with specs of CT settings to avoid saturation and settings of potential secondary PT for protection application?

 

[RRaghunath]

If you are going to have identical protection relays as available with the existing transformer, you may refer to the same CT/VT specifications. Of course, you need to verify to make sure those who have sized those CT/VTs have not committed any mistake.
Generally, you refer the Protective relay technical manuals for the CT/VT parameter sizing formulas / information. If you know which make/model relay you pan to purchase, it is easier. Otherwise, you have to size the CT/VTs suitable for different make/model relays.