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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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    300% of what ? The average neutral current ? The most heavily loaded phase? -

    As noted above, if the 50Hz neutral current is low, then even a modest 150Hz contribution from each phase may look enormous as a fraction of that. No need to panic unless it is more than perhaps 20% of the most heavily loaded phase.
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  • 0
    300% of what ? The average neutral current ? The most heavily loaded phase? -

    As noted above, if the 50Hz neutral current is low, then even a modest 150Hz contribution from each phase may look enormous as a fraction of that. No need to panic unless it is more than perhaps 20% of the most heavily loaded phase.
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