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Thanks for the posts gentlemne. I am pretty clear about what is happening now. Much appreciated

Thanks DanDel for the response. I have probably not explained myself too well. The only ground connection is from the star point of the wye transformer. What I probably should have said is the magnetising 'impedance' is so large that the potential ground current is smaller. I have tried to add a...

I think I have convinced my self that the megnetising current is significantly larger so the ground current should be much smaller

I have a HRGS system using a wye primary (star point connected to ground) and delta secondary. The three phase delta is 'open/broken' at one point and a resistor included to limit the ground fault current. The question I have is, what happens to the ground impedance if the resistor is put in...