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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
    MS01:
    The highest phase it at just over 100A with the other phases there or there abouts but the neutral current is at 50A




    How do you achieve balancing a three phase load in a residential building with single phase loads that will cancel the neutral current?


    You can balance the load to get an even load across the phases, but you cannot cancel the neutral can you?


    It’s over twenty years since I sat drawing diagrams during evening classes at Kidderminster College, but I don’t remember one where it showed how a single phase neutral current is cancelled.


     Andy Betteridge 


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  • 0
    MS01:
    The highest phase it at just over 100A with the other phases there or there abouts but the neutral current is at 50A




    How do you achieve balancing a three phase load in a residential building with single phase loads that will cancel the neutral current?


    You can balance the load to get an even load across the phases, but you cannot cancel the neutral can you?


    It’s over twenty years since I sat drawing diagrams during evening classes at Kidderminster College, but I don’t remember one where it showed how a single phase neutral current is cancelled.


     Andy Betteridge 


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