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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
    Perhaps someone who can would like to illustrate a SMPS which gives a harmonic content of 50%? Unfortunately they don't work like that. This, as someone said above, must be odd harmonics, and every supply must be the same. The way forward is to show us the neutral current waveform, this is not rocket science. The waveform would have to be almost completely square to have a harmonic content of 50% (from Fourier). I suggest this is simply a measurment problem.
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  • 0
    Perhaps someone who can would like to illustrate a SMPS which gives a harmonic content of 50%? Unfortunately they don't work like that. This, as someone said above, must be odd harmonics, and every supply must be the same. The way forward is to show us the neutral current waveform, this is not rocket science. The waveform would have to be almost completely square to have a harmonic content of 50% (from Fourier). I suggest this is simply a measurment problem.
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