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Re: MMC Caps
Hi Reinhard,
I have a 12 inch X 51 inch polished alu topload, (it's the one you can
see in the second light pics), Which
The coil won't have anything to do with! - will continually arc up and
down the secondary. I am having a
third top load made which is half way between the one I'm doing now and
the one mentioned above - I
believe it will sufficiently load the secondary without preventing
spontaneous breakout.
I am going to decrease coupling by one inch tomorrow.
In the past there hasn't seemed to be any relationship as I didn't get
any secondary racing arcs
Secondary was sanded, coated with non water based polyurethane for 3
coats, sanded between coats,
Then wound, coated twice a day for 10 days straight, (35+deg C for each
day).
Thanks for the compliment about the website - I am going to post more
pics soon, including my dissection of
my first secondary, the internal arcing left very obvious tracking
inside the form. We live and learn!!
Best Regards,
Robin in OZ.
> I donīt think you are at the limit of a 10" secondary with 10kVA.
> Have you tried using a *secondary* topload in addition to your
> main toroid? I would add an additional toroid to further load your
> coil. If the second toroid is a polished unit, then I would add a
> small bump to propagate streamer breakout and I would play
> around with the coupling a bit (lower it at higher kVA levels.)
> This should allow your secondary to get rid (i.e: longer sparks)
> of excessive energy before racing sparks appear.
>
> Is there a relationship to streamer length and racing sparks?
> I bet (okay rather guessing here) every (usually ;o)) time your
> streamer length goes toward the 7 feet mark, you also get
> racing sparks and you get racing sparks because of the shorter
> arc length and not vice versa (shorter streamers because of
> racing sparks) Am I right??
>
> How did you prep and coat your secondary former?
>
> Coiler greets from Germany,
> Reinhard
>
> P.S: Great website. I still havenīt finished downloading it
> completely......... time............
>
> P.P.S: Next time you take pictures, zoom in on the arcs
> (quite) a bit more. This should give you some fascinating
> pictures (even if they donīt look that way during true
> operation).