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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)

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    If you do this wrong you can end up firing the earth fault relay on one genset with the  neutral current of another. Also consider carefully how you would ensure one genset was safe to work on for repairs, if  the others are still running, and the neutral is common.

    For these  reasons normally I'd expect one N-E link per genset, and  a common or at least cross- linked earth arrangement BUT NOT a COMMON NEUTRAL except between pairs of gensets in tandem with no Earth fault protection for the tandem wiring.

    Gensets synced or not makes no difference, though unusual and it is worth avoiding phases from different gensets coming to the same switch gear, as the voltage between them is indeterminate.

    I think you need to query the reason with the consultant, and how he or she expects the earth trips to be set, and maintenance on any one genset to be performed if there is any shared neutral wiring.

    Mike.

    PS

    And that bit of the ESQCR

    "(4) A consumer shall not combine the neutral and protective functions in a single conductor in his consumer’s installation. "

    Does not preclude multiple NE links in the generation side, but not in the load side.

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  • 0

    If you do this wrong you can end up firing the earth fault relay on one genset with the  neutral current of another. Also consider carefully how you would ensure one genset was safe to work on for repairs, if  the others are still running, and the neutral is common.

    For these  reasons normally I'd expect one N-E link per genset, and  a common or at least cross- linked earth arrangement BUT NOT a COMMON NEUTRAL except between pairs of gensets in tandem with no Earth fault protection for the tandem wiring.

    Gensets synced or not makes no difference, though unusual and it is worth avoiding phases from different gensets coming to the same switch gear, as the voltage between them is indeterminate.

    I think you need to query the reason with the consultant, and how he or she expects the earth trips to be set, and maintenance on any one genset to be performed if there is any shared neutral wiring.

    Mike.

    PS

    And that bit of the ESQCR

    "(4) A consumer shall not combine the neutral and protective functions in a single conductor in his consumer’s installation. "

    Does not preclude multiple NE links in the generation side, but not in the load side.

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