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Genset grounding system arrangement

Hi guys ,I need some help on what a suitable grounding system for a standby generator  with  a delta/wye transformer as main feeding pumpstation , most of genset in my area (Middle East) are coming with grounded neutral point bonded to the genset body ,and the transformers grounded solidly at wye side, as a common habit we used to use (RH99)relay for residual earthing current protection installed in both MCC and MDB panels ,before writing here I have checked Schneider 143 white paper and ieee green book but I come out with nothing ,I appreciate if there is any technical analysis for this case 

 

regards,,