Can you maybe attach a drawing of your system layout? Is the LV main earth busbar bonded back to the main substation earth (are the HV and LV earths bonded)? What is the arrangement on the LV side (TN-S TN-C-S TN-C)?
Immediately I'm sceptical about achieving a sub0.1 ohm Ze using aluminum, what CSA have you specified and how did you come up with the requirement of 0.096ohms? Also how are you measuring your present Ze of 0.11ohms, what instrument and what proceedure are you using?
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