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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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    We have had discussions about balancing single phase loads in installations with three phase supplies and meters regarding what the meter is actually recording as usage, the  highest phase, the average or usage by phase.


    But without a load connected across the phases within the installation nothing can cancel the neutral current can it?


    I know this is going right back to basics, but maybe I need a refresher.


     Andy Betteridge 


Reply
  • 0
    We have had discussions about balancing single phase loads in installations with three phase supplies and meters regarding what the meter is actually recording as usage, the  highest phase, the average or usage by phase.


    But without a load connected across the phases within the installation nothing can cancel the neutral current can it?


    I know this is going right back to basics, but maybe I need a refresher.


     Andy Betteridge 


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