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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
    Yes we know in a normal installation with the phases balanced the neutral current would be zero but odd harmonics do not cancel out and infact add current to the neutral which is why I have a high neutral current. Anyone any ideas why, surely this just can't be non linear loads.
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  • 0
    Yes we know in a normal installation with the phases balanced the neutral current would be zero but odd harmonics do not cancel out and infact add current to the neutral which is why I have a high neutral current. Anyone any ideas why, surely this just can't be non linear loads.
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