RE: compact oil insulated secondaries?

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

Original poster: "David Thomson by way of Terry Fritz <teslalist-at-qwest-dot-net>" <dave-at-volantis-dot-org>

Hi Jolyon,

One other thing.  The polymer coating I used is at
http://www.tapplastics-dot-com/fiberglass/epoxy_resins/160_ultraglo.html

I think it would be great to use clear plastic tubing for the outer jacket.
Tap Plastics has a 4" ID 1/4" thick plastic tubing available at
http://www.tapplastics-dot-com/plastics/rods/416_cleartube.html

Dave

 > -----Original Message-----
 > From: Tesla list [mailto:tesla-at-pupman-dot-com]
 > Sent: Wednesday, April 23, 2003 9:06 AM
 > To: tesla-at-pupman-dot-com
 > Subject: compact oil insulated secondaries?
 >
 >
 > Original poster: "Jolyon Vater Cox by way of Terry Fritz
 > <teslalist-at-qwest-dot-net>" <jolyon-at-vatercox.freeserve.co.uk>
 >
 > Dear List,
 > I am considering building an oil filled secondary
 > to improve durability and increase compactness in a small TC in
 > which I am
 > currently using a secondary of 880t of 32swg enamelled copper
 > wire wound on
 > a former measuring 10.875" long x 2.98 diameter.
 >
 > My reason for doing this is because I am planning to double the number of
 > turns by winding a new secondary using 40swg wire on the same former
 > and there may be insulation issues to be considered here.
 >
 > What is envisaged here is a double-walled cylinder made from two
 > plastic  tubes of dissimilar diameter the winding wound on the smaller
 > inner tube with the oil contained between this and the larger outer tube.
 > the ends of the tubes plugged with rings cut from a polythene chopping
 > board and sealed with silicone.
 >
 > I am anticipating cutting the rings from the board using a  hole
 > saw driven
 > by an electric drill with cutting blades of different diameters-
 > will this
 > be OK?
 >
 > Has this method of construction been tried before and  is
 > containment/leakage of the the oil likely to be a major problem?
 >
 > More importantly, what is effect of the oil on primary-to-secondary
 > capacitance -are there tuning issues to be considered with this?
 >
 > Jolyon
 >