This post is to discuss about the differential protection on 3 phases transformer. specifically, star delta connection. I think it is a rich topic in the concepts and might well appear on the PE
How to connect CTs, 30 degrees phase shift, instantaneous currents, zero sequence currents, triple harmonic currents, etc..
you are all welcome to give your thoughts for the benefit of all.
the below figure is for your convenience
![Capture.GIF Capture.GIF](https://cdn.imagearchive.com/engineerboards/data/attachments/3/3444-553bb65fc649981896d02522a11b21b2.jpg)
How to connect CTs, 30 degrees phase shift, instantaneous currents, zero sequence currents, triple harmonic currents, etc..
you are all welcome to give your thoughts for the benefit of all.
the below figure is for your convenience
![Capture.GIF Capture.GIF](https://cdn.imagearchive.com/engineerboards/data/attachments/3/3444-553bb65fc649981896d02522a11b21b2.jpg)