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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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    Indeed - if the space heating is done by hot water or centrally pumped hot air, then the electrical load may well be mostly small stuff - which means electronic power supplies these days and quite a bit of it may be chargers of various wattages and small lights and generally kit that is below the power threshold for requiring any waveform correction at all.

    I'd like to think it could handle more like a kw per flat of ADMD, but maybe modern students  do not make coffee and tea at the same rate that some of us did in years past. Usually some one has a hairdryer and so on.


    regards Mike

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  • 0
    Indeed - if the space heating is done by hot water or centrally pumped hot air, then the electrical load may well be mostly small stuff - which means electronic power supplies these days and quite a bit of it may be chargers of various wattages and small lights and generally kit that is below the power threshold for requiring any waveform correction at all.

    I'd like to think it could handle more like a kw per flat of ADMD, but maybe modern students  do not make coffee and tea at the same rate that some of us did in years past. Usually some one has a hairdryer and so on.


    regards Mike

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