I have two 1800 kVA emergency standby generators that can parallel the utility. When either engine, alone or in parallel, is in parallel with the utility, I have excessive amounts of third harmonic neutral current. This will cause the utility and generator breakers to trip on ground faults. I have verified that I have same pitch generators(11/16). I am concerned that my utility transformer is to blame. I currently have a 1500kVA wye-wye transformer with both the primary and secondary neutrals grounded. It has been a concern that the high side neutral should not be grounded. I am in the process of trying to have the Utility transformer changed to a 2500kVA delta-wye. Do you think this will help?
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