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Re: Equi-drive vs. standard drive, was SGTC



Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

This makes sense. It seems like there really is no difference between a "standard-drive" and a "equi-drive" in terms of residual charge with the exception that on a standard drive, only the two outer nodes are guaranteed to be at zero volts (discharged thru the transformer) and any imbalances due to non equal capacitances, or leakage, or what ever will remain as an internal node of the capacitor bank. Where as, with an equi drive system, that "internal" node is brought out and is connected to the TC primary (not good for changing the tap point). Of course, if bleed resisters are used thru out, this should not be an issue. Maybe Hull wanted the caps absolutely identical in case of a bleed resister failure.

I too can not see any benefit in an equi-drive system.

Gerry R.

Original poster: FIFTYGUY@xxxxxxx
In a message dated 4/28/07 7:51:20 P.M. Eastern Daylight Time, tesla@xxxxxxxxxx writes:
>I did various comparisons of case 2 and case 3.  There was no
>measureable difference in performance.  I also don't see why
>there should be any difference.

Hull emphasized what Tesla had said, that it was mandatory to get the two caps absolutely identical. Once that was taken care of, the results were apparently worth the trouble.

>  Case 3 definitely tended to leave >dangerous charges on the
primary caps.  I think it's because
>of the inductive primary being situated (floating) between the two caps.

But once the power is off, primary reactance should be unimportant. The primary should just look like a dead short to the caps. The secondary of the transformer should complete the circuit, and provide a bleed-down resistance. Still don't see why *could* matter, but I'm glad to see that you've done experiments that show it doesn't affect performance significantly (at least for small/medium coils?)

-Phil LaBudde






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