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.