One thing I don't understand is it's said that places with lots of electronic SMPSUs like data centres and that type of thing can have higher currents in the neutral than the phases how is this possible? I can't really understand it hope someone can explain it
To add to mapj1 explanation, the worst case for 3rd harmonics adding is when the SMPSUs are all running at about 60% of rated load - which is quite normal.
I once worked on a project for a data centre where every Distribution Board had a 1:1 delta / star transformer built in to remove the third harmonic and then had a oversized neutral in the generator as well.
To add to mapj1 explanation, the worst case for 3rd harmonics adding is when the SMPSUs are all running at about 60% of rated load - which is quite normal.
I once worked on a project for a data centre where every Distribution Board had a 1:1 delta / star transformer built in to remove the third harmonic and then had a oversized neutral in the generator as well.
