Hi Adam,I'm not sure what DC will say here, but in my opinion (which is worth a wooden nickel), the corona shielding occurring is affected by the toroid width and height ratio to the coil diameter more than the actual tube diameter itself. There is no doubt in my mind that if you use the "formula" as stated (1.2 x mD), it must be restrained to some ratios. If a toroid is increased in diameter but kept at the same height, it can decrease it's shielding ability and shorted turn affect (coupled losses). If the toroid has a center disc, the effect is far less and actually similar to the original toroid.
So as you suspect, there are "aspects" to consider and there are always geometric assumptions made based on what the poster believes the norm to be. But, there is nothing wrong with a guideline. Of course, as soon as someone posts a guideline, we will certainly break that down into segments (which is what forces our knowledge to higher and higher levels until eventually the guideline is no longer of use - hopefully if all goes well).
Take care, Bart Yurtle Turtle wrote:
Does this relationship hold with differing major diameters as well? In other words, in your example of a 6" x 30", would the height be the same as for a 6" x 24"? Also, would the height for a 6" x 24" toroid be the same for a 6" secondary as for a 10" secondary? thanks Adam
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