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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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  • 0
    I assume the overall neutral current is nearly zero. The harmonic currents do not necessarily cancel on the neutral so the %age figure is rather misleading, and not of much use. Can you measure how many amps this is, and compare this to the phase currents, you will be much happier, or perhaps something strange is going on but I doubt it.


    Regards

    David CEng.
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  • 0
    I assume the overall neutral current is nearly zero. The harmonic currents do not necessarily cancel on the neutral so the %age figure is rather misleading, and not of much use. Can you measure how many amps this is, and compare this to the phase currents, you will be much happier, or perhaps something strange is going on but I doubt it.


    Regards

    David CEng.
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