b alex pettit jr wrote:
Because toroids are relatively easy to make from flexible metal duct, shield better the upper part of the secondary coil, and technically, allow independent choice of capacitance and breakdown voltage.Hello Antonio,If a Sphere has the highest breakdown voltage, why are Toroids now used so frequently ?
I made comparisons of some values, and it appears that the theoretical values are higher, particularly for the thin toroids. But I don't know how the experimental values were obtained. The calculations assume smooth toroids far from other bodies, and breakdown electric field of 30 kV/cm.Do your calculations compare to the data I posted from Ross Engineering for the larger sizes, OR, could you extend your table to include a few examples of 30, 40, and 50 cm size.
A table with capacitances and breakdown voltages:
(diameters in meters, capacitances in pF, voltages in kV)
Minor d. 0.050 0.100 0.150 0.200 0.250
Major d.
0.200 8.600 ------- ------- ------- -------
164.46 ------- ------- ------- -------
0.300 12.082 13.528 ------- ------- -------
200.32 282.95 ------- ------- -------
0.400 15.376 17.200 18.404 ------- -------
227.66 328.91 398.22 ------- -------
0.500 18.535 20.738 22.153 23.265 -------
249.61 367.50 448.88 512.50 -------
0.600 21.591 24.164 25.800 27.056 28.119
267.88 400.64 493.37 565.90 626.35
The Inca program can make these calculations
(http://www.coe.ufrj.br/~acmq/programs)
Antonio Carlos M. de Queiroz _______________________________________________ Tesla mailing list Tesla@xxxxxxxxxxxxxx http://www.pupman.com/mailman/listinfo/tesla