Re: NST Shunt Removal (fwd)

["Tesla list" <tesla@xxxxxxxxxx>]

---------- Forwarded message ----------
Date: Tue, 12 Jun 2007 17:13:10 -0700
From: Jim Lux <jimlux@xxxxxxxxxxxxx>
To: Tesla list <tesla@xxxxxxxxxx>
Subject: Re: NST Shunt Removal (fwd)

At 04:15 PM 6/12/2007, you wrote:

>---------- Forwarded message ----------
>Date: Tue, 12 Jun 2007 19:20:27 -0400
>From: otmaskin5@xxxxxxx
>To: tesla@xxxxxxxxxx
>Subject: Re: NST Shunt Removal (fwd)
>
>Thanks everybody for the advice.  Sounds like 
>heat is the only potential problem - which I 
>gather can be managed with oil emersion & 
>possibly tempurature monitoring.  I don't 
>usually do very long runs anyhow - maybe a minute or minute and a half.Â
>
>I'm going to find a suitable container for the 
>depotted NST & then I'll have a good idea of how 
>much transformer oil I would need.  I'll 
>contact you, Dr R, to order some - thanks for your offer.Â
>
>What does everybody usually use to contain an 
>oil-immersed NST?  Tupperware type of stuff?Â

you got it.. rubbermaid or tupperware.  It has a relatively oiltight seal.
one of those 1 gallon paint cans would probably also work.

The challenge is in getting the wires in and out with an oiltight seal.


>   I assume a container slightly bigger than the 
> NST would contain enough oil for sufficient cooling.

Yes.

transformer oil is easy to come by, once you know 
what to ask for.. ExxonMobil Univolt 65 or Shell 
Diala AX are two popular types.  You'll have to 
call around to find a place that sells it in 
reasonable quantities (usually a 5 gallon 
pail).  Runs about $5-6/gallon.  yellow pages 
under oil-jobbers.  If you buy it from somewhere 
that has to ship it, you'll probably pay more in shipping than for the oil.

If you have a place around you that does 
transformer servicing (i.e. a utility), they'll 
sometimes sell you small quantities of 
transformer oil, but I've had very poor luck (in 
Southern California) with that strategy. On the 
other hand, there's half a dozen oil jobbers 
within a half hour drive, so that's what I've done.

The key is to have the oil clean and dry, which 
is the problem with  "white mineral oil, USP" 
that you get at the drug store or feed store.. 
Those aren't always low water content.