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High 3rd harmonic on the neutral

MS01
Afternoon,

I was wondering if anyone has nay experiences of having issues with high 3rd harmonic currents on the neutral on high-rised residential schemes? I appreciate  non-linear single phase loads will impact the 3rd harmonic and even on a balanced system harmonics are an issue but we are measuring it at 300% but I can’t think why this may be the case on a residential building.

Does anyone have any ideas?



M
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    Those figures are not possible. If all 3 phases are taking 100A there will be zero neutral current.

    Isn't that just the OP's point though - with 3rd harmonics the currents DON'T cancel neatly in the N (indeed they can add).

        - Andy.
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  • 0
    Those figures are not possible. If all 3 phases are taking 100A there will be zero neutral current.

    Isn't that just the OP's point though - with 3rd harmonics the currents DON'T cancel neatly in the N (indeed they can add).

        - Andy.
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