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On 4/29/19 11:04 AM, Daniel Kunkel wrote:
I always thought that the small diameter (about 3 mm) of my brass safety
gap rods was was causing it to fire prematurely since I think that the 3
KV/mm rule is for flat plates and not small-diameter rods.
3 kV/mm is for "uniform field"
For 3mm rods, the limit is going to be set by the radius of curvature of
the rods (1.5mm) as well as the spacing.
The sphere gap tables are for spheres where the gap is much less than
the diameter of the sphere.
What you might want to use is something more akin to a rod gap, or
needle gap voltages. Rods are 5/8" square.
Small diameter wires and long gaps are sort of a tricky thing to model
field-wise.
Most folks just set the safety gap empirically - disconnect the TC load,
and set the gap so it just doesn't fire at the maximum voltage you're
comfortable with.
