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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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    Each flat has a single phase consumer unit fed via a 3-phase infrastructure


    Looks like from the amount of responses this is interesting topic to most, could be worth the IET techincal document about he effects on harmonics on electrical installations. 


    We are logging the installation as we speak so in a couple of weeks we will have a better set of results, as the figures quoted previously were just a snap shot in time. This was taken on the main incomer to the development whihc then is split into sub- switch panels for the different block then all the way down to single phase consuler units in each apartment. The building is no where near full occupancy as of last week, but this should now of changed over the weekend with alot of students moving back in. 


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  • 0
    Each flat has a single phase consumer unit fed via a 3-phase infrastructure


    Looks like from the amount of responses this is interesting topic to most, could be worth the IET techincal document about he effects on harmonics on electrical installations. 


    We are logging the installation as we speak so in a couple of weeks we will have a better set of results, as the figures quoted previously were just a snap shot in time. This was taken on the main incomer to the development whihc then is split into sub- switch panels for the different block then all the way down to single phase consuler units in each apartment. The building is no where near full occupancy as of last week, but this should now of changed over the weekend with alot of students moving back in. 


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