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Thanks erdep Best regards

One more question. If there be more than a transformer in site should I consider any probability coefficient for LV side ground fault?

Thanks slavag Very important tip.

Very Good Thanks erdep Thanks a lot.

Thanks you mean I've just consider Isc in MV side and then design Earth mat using Etap?

Thanks for replies 0.217/Rground ? How do you calculate this 0.217/Rground? Any references? As I understand I should design earth mat for this value,Correct?

Dear all, I have a 1.6MW,400V Gas Engine-Generator with Y Generator and i want to connect it to Y side of a Dyn5 (0.4/20KV) transformer to parallel with grid. in Etap when i earth both of generator and transformer solidly , 75KA phase to earth fault detects in downstream Bus. Fault...