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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
    "So how can you cancel single phase return currents down to zero in the neutral conductor?


    Can someone sketch out the layout of a building installation such as this with a X to mark the point where the neutral currents cancel each other out?"


    You can't. But then 3rd harmonic current isn't an issue in a single phase installation. It is only when you get out into the street that the 50Hz neutral currents start to cancel but the 150HZ neutral currents are additive.
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  • 0
    "So how can you cancel single phase return currents down to zero in the neutral conductor?


    Can someone sketch out the layout of a building installation such as this with a X to mark the point where the neutral currents cancel each other out?"


    You can't. But then 3rd harmonic current isn't an issue in a single phase installation. It is only when you get out into the street that the 50Hz neutral currents start to cancel but the 150HZ neutral currents are additive.
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