CABLE PROTECTION VIA RET 521 VERS. 2.3

[apprenteng]

I have the following arrangement to protect the cable and three transformers (see attachment.). The analog inputs are limited to four and so I plan to sum currents from the CTs on two transformers. The transformera are 132/33 kV Trafos; 2xYNyn0 and Dyn1. How effective is this scheme and will it be stable