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buddy91082 (Electrical) (OP)
22 Feb 13 7:37
We have a 4160v generator. Is a neutral ground resistor typically used for mv generators?

Thanks
B
Mbrooke (Electrical)
22 Feb 13 8:18
Is this for co generation or standby? What are the grounding requirements for your system?

Yes it is typical and recommended for most utility generators. What you need to determine is fault current values (Phase to ground) that are acceptable for your system. As a rough rule of thumb, it is recommended that an ohm value be used in that the phase to ground current is around the phase to phase value during a fault.

If the system you are feeding is a high resistance grounded system that can run on a grounded phase, (as with critical process plants), the ohm value should permit a current to flow about that of the capacitive charging current (to ground) of the phase conductors.
buddy91082 (Electrical) (OP)
22 Feb 13 8:50
Thanks. This is for standby generator. Is typically used I that scenario?

What is confusing me is that there is no neutral. It is a delta connection.Any good technical articles to read on neutral ground resistor.
Mbrooke (Electrical)
22 Feb 13 9:18
If the Utility transformer feeding your system has a Delta secondary, then it is ok for your generator to have a stator configured in Delta. No neutral resistor is needed in your application. Just make sure that the ground detector is still functional when on generator.


This is a brief short on standby generator grounding http://www.cumminspower.com/www/literature/technic...


If you are interested in neutral grounding resistors Post Glover has good products and resources. PDFS:

http://www.postglover.com/neutralground.html

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