This would increase the creepage distance, if it were only a little more rigid.
http://bometals.com/products/waterproofing/pvc-waterstops/
On Friday, October 12, 2018, 4:29:06 PM EDT, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
On 10/12/18 11:32 AM, Yurtle Turtle via Tesla wrote:
> I'd think primary turn to turn surface tracking along the primary supports would occur.
> On Friday, October 12, 2018, 11:03:03 AM EDT, jimlux <jimlux@xxxxxxxxxxxxx> wrote:
>
>
> Every few years, someone comes up with an inexpensive surplus X-ray
> transformer (100kV kinds of voltages) - Life is really hard above around
> 30-40 kV - corona is a big issue, as is plain old breakdown.
>
> Remember the rule of thumb is that you want 1" of clearance between
> conductors per 10-15 kV - 30kV equipment tends be big and bulky.
>
> Also consider the minimum conductor radius for no corona. Breakdown
> field in air is about 70kV/inch. The field at the surface of a
> conducting sphere V/radius, so a 1" diameter sphere at 35kV is right at
> the breakdown - and a bit of surface roughness is all it takes.
> Cylinders work pretty much like spheres -it's the smallest radius of
> curvature that's important.
>
>
If your primary supports have long enough creepage distance, that won't
happen. A rule of thumb is that distance along an insulating surface
shuold be > 3 *free air spark distance.
So if your primary turns were 1/2" diameter tubing spaced 1" apart
(center to center), your supports should be >1.5" along the support. So
1/2" height pegs on 1" centers would work.
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