And you don’t think that intelligent power management systems available today
could correct for this?
Gary
> On Aug 27, 2016, at 12:30 PM, Jim Brown <k9yc@audiosystemsgroup.com> wrote:
>
> 3-phase power is not the universal blessing that you believe it to be. The
> overwhelming bulk of the power delivered to today's homes is to electronic
> loads, which draw highly distorted current, resulting in very high harmonic
> content. That, in turn, results in high neutral currents that consist of
> "triplen" harmonics of the fundamental rate (50 or 60 Hz). Triplen harmonics
> are those whose order is a multiple of 3, and they add in the neutral rather
> than cancel, even with loads that are perfectly balanced. Those harmonics
> also add in the "green wire," producing the characteristic "ground buzz" (180
> Hz, 360 Hz, 540 Hz, 720 Hz, . . . ), as opposed to hum (50/60 Hz).
>
> Neutral currents in 3-phase systems can easily exceed the current in a phase
> conductor. Neutral current is what started the very real "Towering Inferno"
> and burning insulation running up cable risers carried the flames.
>
> 73, Jim K9YC
>
> On Sat,8/27/2016 1:37 AM, Gary J FollettDukes HiFi wrote:
>> Only politics, and the relentless battle that power companies wage every day
>> to avoid capital investment in new power delivery apparatus.
>
>
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