Re: Phasing parallel coil and core NSTs

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

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

Gary you are asking " is safety important?"" is your life important?" You
make the choice and dont haunt us if you kill your self.
  Robert  H 

> From: "Tesla list" <tesla-at-pupman-dot-com>
> Date: Tue, 16 Apr 2002 17:36:41 -0600
> To: tesla-at-pupman-dot-com
> Subject: RE: Phasing parallel coil and core NSTs
> Resent-From: tesla-at-pupman-dot-com
> Resent-Date: Tue, 16 Apr 2002 17:49:13 -0600
> 
> Original poster: "Vanderputten, Gary by way of Terry Fritz
> <twftesla-at-qwest-dot-net>" <gvp-at-pvaintl-dot-com>
> 
> 
> 
> -----Original Message-----
> From:  Tesla list [mailto:tesla-at-pupman-dot-com]
> Sent: Tuesday, April 16, 2002 3:20 PM
> To: tesla-at-pupman-dot-com
> Subject: Re: Phasing parallel coil and core NSTs
> 
> Original poster: "by way of Terry Fritz <twftesla-at-qwest-dot-net>"
> <Esondrmn-at-aol-dot-com>
> In a message dated 4/15/02 10:18:36 PM Pacific Daylight Time,
> tesla-at-pupman-dot-com writes:
> 
>> 
>> I am making a small 250 w coil powered by 2 identical 5kv/25ma open core
> and
>> coil neon transformers.
>> 1. I noticed that neither will arc to the core and therefore appear not
>> center grounded. Are there issues with phasing the two in parallel?
>> 
>> 2. Should I ground the cores to the mains ground or the RF ground? With my
>> other coils I ground the case to the RF ground.
>> 
>> 3. Even though it is small, I am installing a Cap and resistor style NST
>> protection circuit. Is this necessary ( I have the spare parts)?
>> 
>> Gary
> 
> 
> 
> Gary,
> I would measure the secondary to core resistance.  If it is open circuit,
> then the core is floating and there is no center tap connected to the core.
> If it measures one half of the total secondary resistance, then you know
> there is a center tap that is connected to the core.  In this case, I would
> ground it.
> 
> Check - it is an open circuit.
> 
> 
> To check parallel transformer phasing, set the two transformers up in the
> position that you want to use them and connected the primaries in parallel.
> Now connect one side of each secondary output together.  With power applied,
> you should get a very small spark or no spark when the other two secondary
> leads (one from each transformer) are brought together.  You can now connect
> these secondary leads together.  If you get a large spark, reverse the
> primary connections to one transformer and try the test again.
> Ed Sonderman
> 
> Thanks to all for their helpful comments.
> 
> Gary
> 
> 
>