Hi Bert, et al,
There seems to be conflicting posts on the Inet regarding Delta DC
rectification. Wye is considered 6 pulse, Delta is not well defined. I have
to ass-u-me they are both 6P rectifiers, nonetheless.
Richie's site has a (12) pulse conveniently drawn Wye and Delta in one
schematic which nicely graphically depicts the rewire in phase. (A)
"neutral" will tie B at the previous B wye HV lead and so on to complete the
triangle. It is hard to see on the xformer, but logically the Wye neutral
would be an inner winding closer to the primary, so the voltage level out is
important, consistent with the standoff from the Primary windings. Is the
voltage still 58% of the 24KV?
Since this was a mission critical, 24/7 device under oil, I am confident it
can take the stresses for Tesla intermittent duty, even if the winding
configurations are less than ideal, provided the voltage in not too high. It
is NOT, however, three pole pigs;-^)
My 14" rotor has (16) .125 Tungsten through threaded brass nutted electrodes
with set screws and can comfortably do 500 - 600 BPS. I would want to design
around a .1uf cap rather than (2) in series (.05) in this case at lower
voltages and resist the temptation to twist the Variacs full tilt!
Please confirm the voltage out. I'll study more earnestly the magnetic study
documentation you sent me during the list migration.
Thanks so very much,
Jim Mora
-----Original Message-----
From: tesla-bounces@xxxxxxxxxx [mailto:tesla-bounces@xxxxxxxxxx] On Behalf
Of Bert Hickman
Sent: Tuesday, July 08, 2014 6:17 AM
To: Tesla Coil Mailing List
Subject: Re: [TCML] Was: Raytheon turns ratio too high for sane resonant
charging, Now: more reasonabe 50:1
Hi Jim,
Oops - I just noticed an error in my previous message. The current
output (when using a delta configuration on the secondary) will increase
by Sqrt(3) or 73%, not 58% versus the previous wye configuration. Better
for rapidly (re)charging your tank cap.
Bert
Bert Hickman wrote:
> Hi Jim,
>
> Since you now have access to all the secondary leads, one option would
> be to reconfigure your power supply using the existing wye (or star)
> primary, and convert the secondary to delta configuration. If the
> original wye-connected secondary could deliver 24 kVDC, changing the
> secondary to a delta connection will result in an output that is
> 1/sqrt(3) times the original output, or about 58% of the original
> output. The revised output will be 0.58*24 kV or about 14 kV. You can
> then connect six diode strings to create a FWB DC output. This is now
> in a reasonable voltage range for either direct operation or 2X tank cap
> voltage multiplication using either resonant charging or a
> charge-reversing (Steve Young) gap. This configuration will also provide
> you with 58% higher output current (for the same transformer kVA output).
>
> Bert
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla
_______________________________________________
Tesla mailing list
Tesla@xxxxxxxxxx
http://www.pupman.com/mailman/listinfo/tesla