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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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    Sparkingchip:

    I have found a Diagram that shows the waves in relation to each other showing why you can end up 200% above where you expect to be.


    Andy B.


    Very useful diagram - explains the addition of third harmonics very well. Thanks for finding it, Andy.


    It does not, however, explain mathematically to my understanding why you can reach 200% in the neutral. However L & T has obviously done some research into this so I'll take its word for it.


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  • 0
    Sparkingchip:

    I have found a Diagram that shows the waves in relation to each other showing why you can end up 200% above where you expect to be.


    Andy B.


    Very useful diagram - explains the addition of third harmonics very well. Thanks for finding it, Andy.


    It does not, however, explain mathematically to my understanding why you can reach 200% in the neutral. However L & T has obviously done some research into this so I'll take its word for it.


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