Re: 10KV RMS -at- 300MA

Subject:       Re: 10KV RMS -at- 300MA
       Date:   Tue, 3 Jun 1997 11:52:53 +1200
       From:   "Malcolm Watts" <MALCOLM-at-directorate.wnp.ac.nz>
Organization:  Wellington Polytechnic, NZ
         To:   tesla-at-pupman-dot-com

Hi Skip,
         One other thought: Have you tried using a higher k yet?
Also, how about varying the inductive limiting if you can?


> Hi All but especially owners of the H&R 5kv-at-300ma transformers
> I will not take up space by reiterating the design of the TC I built to
> test the H&R trannies. Final results with the TC are that it develops
> 66" discharges using a .08uf primary cap, a sync rotary break, and no
> other resonant caps. The input for 66" discharges is 90v and about 17A
> (read on an iron vane ammeter). This thing is quenching at first notch.
> Have not measured k. Higher input voltages exceed the 5kv settings of
> the safety gaps and therefore are not usable.
> After consulting with several people and with much trepidation, I
> decided that the only way to process more power would be to increase the
> break rate.
> I have a variable speed break driven with a universal motor. I can
> control speed with a variac. The rotor has 24 pins on a 11.75" diameter.
> The device is probably capable of 7 to 10,000 rpm but that high a speed
> is obviously not necessary.
> Anyway, using this rotary, the performance at 120pps (presentations/sec)
> is very similar to the performance when using the sync break. At higher
> break rates the performance degrades and never approaches the
> performance at 120pps. Input current does not change much but it is
> possible to increase the input voltage to the full mains voltage of
> 117v.
> I am totally snowed by this. I really expected to see more power
> processed and longer sparks. I tried break rates up to about 700pps and
> also varied the primary taps...to no avail.
> I am really looking for suggestions/explanations. This makes no sense to
> at all. Maybe it is a reality that a truly synergistic system running
> with a sync break is running at maximum.
> The good part is that the trannies still live. Running a non-sync break
> really beats the devil out of the trannies and these things just keep
> putting out.
> Please refer to previous posts on these trannies as regards to the
> changes which have been made to keep them healthy.
> Flames and suggestions will be appreciated.

Well my mini-coil experiments do show that more breaks at lower 
primary voltage can score the same length. Is the cap voltage sagging 
much with the higher BPS?
   One thing that does stand out is the complete difference in spark 
quality and the type of spark.