i have two transformer, in my system. Alternator is 6000 volt. and transformer is,

1. 6000/3300 volt 3 phase, 8000 KVA 7 % impedance
2. 3300 / 11000 volt 3 phase. 4000 KVA 7 % impedance

I produced 6000 volt and step down by 3300 volt and use in my internal network and neutral is in 3300 volt side (secondary winding) and same 3300 volt i am connected to 3300 / 11000 volt transformer for national grid for power export, (neutral in 3300 volt side)

my question is, I connected neutral of both transformer to earth and what is the NGR Resistance?

 

Responding to Hussain's 18-Dec-09... as first step have you determined total capacitance-to-earth of 3-kV system?

Regards, Phil Corso