If Step Up transformer is installed neared to Generator, and generator has already been equiped with overflux (v/f) protection then do we still need to have a separate overflux protection (v/f) for step up transformer? OR generator (v/f) protection is enough for SUT as well..
Over flux Protection (V/f) for Generator Step Up Transformer.
I believe, as per IEEE C37.91 Guide for Protection relay application to Power Transformer, 8.2.4 Over excitation protection, is it correct to assume that voltage of generator transformer and generator voltage are equal and the generator transformer is located at the generator closely. Additional V/Hz protection for generator transformer is not required.
If it is required, then under what circumstances e.g. in case of grid fluctuations etc...Any thoughts about it?