Hello Tesla Friends,
Regardless of the outcome with my Raytheon Power Supply, I have completed
the Six Pulse, Full Wave three phase rectifier strings. They are comprised
of (54) each UF5408 1KV with a faster switch time than the more robust
milspec 1N5408. The peak forward surge current is 150 amps at one cycle of
60Hz versus the 1N5408 300 amps. Both are speced 700 volts reverse RMS.
Since there are effectively 6 Strings of (24) on three center tapped G10
.125" x 1.5" x 24" for each polarity (over kill on voltage maybe), but it is
easy to shunt some if desired. The center taps are the H1, H2, H3
connections. And the ends will be tied together for isolated Positive and
Negative.
I am working on the "Darwin Award" this year as the transformer tipped over
and broke my Fibula in the lower left leg - A great time to be making diode
strings!
**** Here are the questions about the dequeing Diode design****
(1) can the 2X resonant voltage come slushing back to it worse case and be
seen on the cathode? Which if I had my way this would be about 22-25KV out
(10KVA input power) say 5KV H1,2,3 transformer (12.2 KV calculated +,-)
rectified for HV out of "some" 3P transformer.
(2) what should be the max current rating be in such a scenario.
(10KVA/12.2KV) min = .82 amps. These diodes like to idle at about 1 amp 1.5
max at room temp to distruction. I would like to make this string 3amp
capable by paralleling (2) strings. I have heard many discussions on this
topic. Is it better to parallel each diode or entire strings? I would think
each diode... I know balancing is an issue that may need some form to
address, but keep in mind I have a glut of 300 diodes on hand, remaining.
I'll post some pictures on my progress blog of the diode strings: nice,
proven construction on road warrior Professional High Power "Boutique" Tube
Guitar amps which is what I have been doing for several years. Retired now
except more fun stuff, sans broken bones or HV dire shocks ;-^) I promise to
use an over abundance of caution and respect going forward!
Jim Mora
Next up: ... post reactor, I'll call transient reverse biased diode specs to
RF ground for the envisioned coil. I have a 4" RF air choke already.
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