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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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    MS01:

    My thought was this is a big block of flats 300+ which are used by students and now with lectures online mostly will be using laptops....what are peoples thoughts? 


    We are doing some load montitoring and we noticed this issues. 




    So does each flat have an independent installation with a consumer unit in each supplied from a three phase distribution board that does not have any three phase loads connected into it at all?


    Andy B.


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  • 0
    MS01:

    My thought was this is a big block of flats 300+ which are used by students and now with lectures online mostly will be using laptops....what are peoples thoughts? 


    We are doing some load montitoring and we noticed this issues. 




    So does each flat have an independent installation with a consumer unit in each supplied from a three phase distribution board that does not have any three phase loads connected into it at all?


    Andy B.


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