[TenTec] Slightly OT: Sunspots for propagation? Who needs 'em?

[Gary J FollettDukes HiFi]

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 at 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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