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3 phase arcs with 9 MOTs

     This is another project that has no practical use (or I didn't find any yet), but is very cool :). It is a three-phase arc - arc that burns between three electrodes powered by three-phase high voltage supply. The electrodes are arranged in a horizontal equilateral triangle. Its side during experiments was about 5-15 cm. Arcs reached the height of 80cm (32''). Later I put salt on the electrodes to make the arcs orange.
     As a source of three-phase high voltage, 9 MOTs (transformers from microwave ovens) were used, 3 in parallel in each phase. The cold end of the secondary has been connected to line to insrease the voltage The current was limited at the secondary side using resonant capacitors - 5pcs of microwave oven capacitors for each phase, about 5uF total, rated 2100V~ (Test voltage of these capacitors is supposed to 7100V AC and 9000V DC). It draws about 30A on each phase. 16A circuit breaker at this current trips after about 20s. To avoid tripping breakers when switching on, each phase is connected first through the 35mH coil and then directly. instead of coil resistance can be used.

     Warning! The output voltage of a transformer from a microwave oven is around 50Hz 2100V AC and current ranges in the order of amperes. Using more MOTs can achieve even higher voltages and currents. The output high voltage is lethal and can to bridge large distances. The shock may therefore occur without direct contact with conductive parts. Capacitors can remain charged even after turn off. When working with this equipment there is a risk of fire. Arcs produce poisonous gases. Everything you do at your own risk. Author accepts no responsibility for any harm to your health, life, property or otherwise.

Schematic of the 3 phase HV supply with 9 MOTs build for producing 3 phase arcs

Three phase arcs

Arcs with salt (NaCl) on electrodes

Powerfull HV supply with 9 MOTs


Electrodes with salt.

Video - 3 phase arcs with 5uF and then 4uF current limiting capacity

Video - 3 phase arcs with salt and 5uF current limiting capacity

Added: 19. 10. 2011