I wanted to test how the discharegs will behave with the DC current.
So I built the three-phase high-voltage high-power PSU. For transformation I used a total of 6 MOTs (transformers from microwave ovens).
At each phase there's one pair of MOTs connected with both primary and secondary in parallel. The resulting pairs are then connected
to the star configuration. Current limiting is provided by 9 capacitors from microwaves (capacity around 1uF), 3 in parallel in each phase.
Output voltage is three-phase bridge rectified. I needed 6 high-voltage diodes. Each of these
is created by combining 12-BY255 (1300V 3A) and therefore withstand voltage 15.6 kV and current of 3A. Voltage of this source with no load is about 6kV,
Short-circuit current to 3.5 A. When shorted, it draws 3x 11A from three phases of 230V~, so it is is 7.6 kVA. Supply can work with the 6-capacitors (one from each branch
removed) - MOTs then produce much less heat, but the current is smaller.
In the supply I used MOTs 1,3,4,5,6 a 8 from the
table of my MOTs .
Arcs from the three-phase supply are characteristic by its sound, in which instead of folders 50Hz and 100Hz prevails
combined frequency of 150Hz and 300Hz. Three-phase rectified current never passes through the zero point, and therefore
discharges don't extinguish so easily. See the photos and videos below :).
