Re: IS 240VAC two-phase - NO

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

Original poster: "John Richardson" <jprich-at-up-dot-net> 

Hi Ed,

I was just trying to allow a better visual for people following the "2 phase
pole pig" thread.  Most coilers not familiar with PDTs surely are familiar
with NSTs, and I figured it was an example everyone would be familiar with.
However, you are most certainly right about many trans not being like this.

John Richardson
----- Original Message -----
From: "Tesla list" <tesla-at-pupman-dot-com>
To: <tesla-at-pupman-dot-com>
Sent: Thursday, January 08, 2004 2:19 AM
Subject: Re: IS 240VAC two-phase - NO


 > Original poster: Ed Phillips <evp-at-pacbell-dot-net>
 >
 > "Hi Guys,
 >
 > Think about it:  Everyone's NST's are center tapped.  Is this some
 > miraculous conversion of 110 single being converted to 12 or 15 thousand
 > volts two phase?  No.  Just one huge multi thousand count secondary
 > (Actually two separate but connected in the middle) with a wire tapped
 > in at
 > the exact center of the number of turns and grounded to case.  In a 15K
 > NST,
 > if we want 7.5K to run a small coil, what do we do?  Utilize one high
 > voltage bushing (one half of the windings) for a hot, and the case,
 > which
 > again is connected to the center of the huge secondary, as a neutral.
 > Want
 > double the voltage?  Run off of both bushings for the full fifteen
 > grand.
 > Same with a distribution transformer.
 >
 > John Richardson"
 >
 > Not exactly so.  Plenty of smaller transformers have only a single
 > winding, ungrounded, and only two leads.
 >
 > Ed
 >
 >