RE: Cat's meow and 3-phase question was: Silly question?

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Loudner, Godfrey by way of Terry Fritz <twftesla-at-qwest-dot-net>" <gloudner-at-SINTE.EDU>



> -----
> 
> 	-----Original Message-----
> 	From:	Loudner, Godfrey 
> 	Sent:	Thursday, September 27, 2001 10:41 PM
> 	To:	'Tesla list'
> 	Subject:	RE: Cat's meow and 3-phase question was: Silly
> question?
> 
 	Hello Dave
 
 	One possible reason you see a lot of wye-to-wye connections between
 three single phase units is for economic reasons. The voltage of each unit
 is only 58% of the line voltage. The single phase units need only be
 insulated for relatively low voltage with the resulting cost reduction.
 The grounding procedure you see will permit unequal loads on the three
 leads to be carried through the neutral back to the generator. A third
 winding in each single phase unit can be provided to suppress third
 harmonic voltages. 
 
 	Godfrey Loudner 
 
> 		-----Original Message-----
> 		From:	Tesla list [SMTP:tesla-at-pupman-dot-com]
> 		Sent:	Thursday, September 27, 2001 9:27 PM
> 		To:	tesla-at-pupman-dot-com
> 		Subject:	Cat's meow and 3-phase question was: Silly
> question?
> 
> 		Original poster: "by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <Tesla729-at-cs-dot-com>
> 
> 		In a message dated 9/27/01 9:56:07 AM Central Daylight Time,
> tesla-at-pupman-dot-com
> 		writes: 
> 
> 
> 		>
> 		> The site that shows the homebrew pig is located at 
> 		> http://www2-dot-netdoor-dot-com/~maxz . The core is constructed by
> gluing together 
> 		> the cores of small transformers. I collected a pile of
> transformers used to 
> 		> supply street vapor lamps. The power company here does not
> care if you dig 
> 		> in their dumpsters. The cores are easy to get apart with a
> hacksaw. I made a 
> 		> good size square core by spot welding the cores together.
> I experimented by 
> 		> using the existing primaries. By using a secondary with
> about 20 turns, I 
> 		> found that the voltage output varied a lot when I changed
> the position of 
> 		> the coil. I concluded that the performance of such a core
> was too erratic to 
> 		> predetermine a set of design parameters. Also the core had
> a number of hot 
> 		> spots during operation. Even though I made the core very
> uniform, it 
> 		> probably had a complex of eddy currents. I am willing to
> bet that the wave 
> 		> shapes of the output did not look anything like those of
> 60 cycles/sec. The 
> 		> charging of a tank cap would be very erratic. In fact the
> owner of the site 
> 		> e-mailed me that the transformer worked, but it blew his
msnip...