Re: 2 transformers?

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

Original poster: "davep by way of Terry Fritz <twftesla-at-qwest-dot-net>" <davep-at-quik-dot-com>

Tesla list wrote:
 
> Original poster: "Joseph Geiss by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <joseph20-at-comcast-dot-net>

> I tried this with 2 MOTS some time ago but didn’t get any output from
> the second MOT.

	Given that later, both tested ok, this seems curious.
	How is it known that no output was present?
	What exactly is 'no output'?

	If no output means none, zip, nada, with both MOT hooked
	up, this sounds like a phasing problem.

	If 'no output', means no apparent increase in primary side spark
	gap, there might not be much: Output voltage will not rise, if
	the primaries and secondaries are both in parallel.  The
	increase is in current.

	IF:
	the HV output from the 'lineside' MOT is wired to the
	LV (line input) of the second MOT:

		THAT is guaranteed to not work.
	cf previous postings.

	(In a simplistic sense, yes transformers are ratio
	devices.  In detail, however, there are limits.  One cannot
	wire HV to a LV input and cascade up, unless the transformers
	are designed fo it.  (in rather more detail: the HV outputs
	have a high impedance, (relatively), and cannot drive the low
	impedance of the next transformer input.)

> Disappointed that I fried the insulation on the second
> mot I tested both transformers and was still able to pull the usual,
> powerful arc a mot produces. I have been curious lately about putting
> the output from one of my mots into a 12v AC transformer, submerged in
> oil, but use it as a step-up transformer by using the 12v secondary as
> the primary and getting 20KV out...

	I'd expect it to not work.  Same as above.
	The oil will insulate for some things, however the 12v
	windings are only insulated for 12v (ok, probably for a
	couple hundred.  They are designed for 12v, not several KV.
	different insulation.  AND the '12v' transformer 'primary' (now
	proposed as a 'secondary') is insulated for 120VAC service, sure,
	it will take a few thousand, but 20 KV will punch thru real
	quick.)

	(There ARE LV transformers, with HV insulation, intended for
	certain vacuum tube applications.  Uncommon.)

	IF the cascading of 120>MOT>12v>yejiminy works, i'd expect it to be
	prone to failure, as above (and below).

	ALSO:
	The 12vac transformer is looking to be supplied (reversed) with
	an amp or more (depends on the ratings).  The MOT is set up
	to supply a few hundred mA.  This will limit he output
	voltage...  AND overheat the MOT trying.

> We'll see what happens :)

	I'd expect the smoke to come out...  Sooner or later.
	And smoke coming out thru a bucket of oil tends to attract
	attention. 

	best
	dwp
> -----Original Message-----
> From: Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Saturday, March 23, 2002 5:16 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: 2 transformers?
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Kidd6488-at-aol-dot-com>
 
> In a message dated 3/17/02 5:48:15 PM Eastern Standard Time,
> tesla-at-pupman-dot-com
> writes:

> > i have a question, probally a stupid one, say you had 2 15kv nst's.
>> If you hooked the first on up like you would normaly, but then took
>>the output of the first one and put it as the input of the second
>>one, would you get 30kv out?