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Generator Earthing (Neutral Earthing loop between other nearby Generators).

Jackson Jose

In one of our recent project. There are multiple generators and individually feeding to each MDBs. Consultant instructed to loop all the Generator Neutral between each generators. Our proposal to provide individual neutral earthing for each generators. 

Is it advisable to loop Generator Neutral Earthing (These generators are not synchronizing)

Parents
  • 0

    You have probably made an assumption of these being "packaged" generators Mike. In a fixed installation Earth fault relays would not be fitted at these machines, but in or after the MDB or maybe not at all. However you are right about the separation for maintenance etc, and there is no reason I can think of as to why the neutrals should be connected before the MDB and therefore the maintenance isolation.Looking at the photo, I think this is likely not to be UK, and here unsynchronised generators would be very unusual, but the ESCQR would not apply. Again CNE etc and cables to the MDB would probably be short so not worthwhile. Likewise the position of N-E links may well be the MDB.

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  • 0

    You have probably made an assumption of these being "packaged" generators Mike. In a fixed installation Earth fault relays would not be fitted at these machines, but in or after the MDB or maybe not at all. However you are right about the separation for maintenance etc, and there is no reason I can think of as to why the neutrals should be connected before the MDB and therefore the maintenance isolation.Looking at the photo, I think this is likely not to be UK, and here unsynchronised generators would be very unusual, but the ESCQR would not apply. Again CNE etc and cables to the MDB would probably be short so not worthwhile. Likewise the position of N-E links may well be the MDB.

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  • 0 in reply to David Stone

    I cannot see a  photo. So yes,  I was  imagining each genset with its own regulation,  main breakers etc.  I'm also assuming generation direct at LV for distribution -  So  if it is multi-megawatt with generation at 6000v per phase I'm out of my depth, but I'd still expect there to be some sort of earth fault detection, after all we manage it on our 11kv overhead lines.

    Mike.

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