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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
    "it made me wonder how much of the oversizing is precaution, and how much is still a necessity."


    A number of years ago I was helping out with the design of a series of data centres. The main designer was a bit of a salesman and he had put in a generator and main switchboard with a double sized neutral. After a while I twigged that all the outgoing supplies to the floors were three wire three phase supplies to delta star transformers at the DBs. and the only outgoing neutral fed the lighting supply. I asked him why the double sized neutral. Strange he didn't want me to work there any longer.
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  • 0
    "it made me wonder how much of the oversizing is precaution, and how much is still a necessity."


    A number of years ago I was helping out with the design of a series of data centres. The main designer was a bit of a salesman and he had put in a generator and main switchboard with a double sized neutral. After a while I twigged that all the outgoing supplies to the floors were three wire three phase supplies to delta star transformers at the DBs. and the only outgoing neutral fed the lighting supply. I asked him why the double sized neutral. Strange he didn't want me to work there any longer.
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