[TowerTalk] [Fwd: Re: Power Distribution]

[Larry McDavid]

-------- Original Message --------
Subject: Re: [TowerTalk] Power Distribution
Date: Sat, 07 Aug 2010 23:52:46 -0700
From: Larry McDavid <lmcdavid at lmceng.com>
Organization: LMC Engineering
To: jimlux <jimlux at earthlink.net>

"NO good reason to have 3-phase power...?" I believe my 72,000 BTUs of
air conditioning would be more efficient if the Freon compressors were
operated on 3-phase power. If 3-phase power were installed at the time
of construction, the incremental cost would be minor.

In my case, I have three VFD controllers generating 3-phase power for
machine tools in my home shop. I would not need these if my home were
supplied 3-phase power. I have underground electrical service and on my
short street there are two underground transformers supplied with
3-phase power (9.6KV, I think). It would have been simple to provide
3-phase underground drops to each home when originally built.

I have a friend in The Netherlands who tells me that his historic home
has always had 3-phase power and that every motor-driven appliance
operates on that 3-phase system, including even his electric garage door
opener! I find that to be quite progressive.

Just because you *can* operate capacitor start/run induction motors on
single phase does not mean that is the best way.

Larry W6FUB


jimlux wrote:
> Jim Brown wrote:
>> On Mon, 2 Aug 2010 12:13:06 -0500, Tom Ed Moore-k5bm wrote:
>>
>>> deally it would be great to have true 3 phase to the shack and I do not 
>>> mean open Delta which sucks.
>> There is NO good reason to have 3-phase power for anything but a big 
>> motor. 
>>
> 
> Or if you want to run a 6 pulse/12 pulse rectifier to reduce the ripple 
> without needing a lot of energy storage in the filters..


-- 
Best wishes,

Larry McDavid W6FUB
Anaheim, CA  (20 miles southeast of Los Angeles, near Disneyland)


-- 
Best wishes,

Larry McDavid W6FUB
Anaheim, CA  (20 miles southeast of Los Angeles, near Disneyland)