Hi John:
> >Yes, delta-wye distribution transformer overheating
> >does occur due to the circulation and dissipation of
> >the triplen harmonics in the primary (delta) winding.
>
> Thank you for that and the rest of the information, which could prove to
> be very helpful indeed. I would like to use it in my continuing efforts
> to defuse the arguments between the former TC74 experts in TC108 and the
> SC77A/WG1 people. May I say that the information came from you
> (personally, of course, not from HP)?
Actually, I learned this and other facts about harmonics
>from my participation, some years ago, in the CBEMA
(now ITIC) ESC-3 committee. The minutes of those
meetings (whereever they may be) would support my
assertions.
My understanding of the European situation is that up to
600 homes could be on one distribution transformer, and
that the power is distributed as three phases with one
neutral. The cumulation of harmonics on such a system
would indeed tend to flat-top the voltage waveform for
those homes that are far from the transformer. Also,
the harmonics would tend to overheat the primary of the
distribution transformer, the failure of which would
cause a much larger outage than in North America.
Likewise, in Europe, within commercial and industrial
sites, the distribution transformer is comparatively
large, and supplies a very much greater load.
Best regards,
Rich
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