Arc generating electric system for a metal casting apparatus
AssigneeIwatani Sangyo Kabushiki Kaisha
InventorYoshimasa Kidowaki
Life of this patent
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Abstract
An arc generating electric system includes a first high-tension d.c. supply, electrodes and a high-voltage rectifier, the electrodes and the rectifier being connected in series, wherein the rectifier is in a forward position with respect to the first d.c. supply, and the arc generating system additionally includes a second high-tension d.c. supply connected in parallel to the rectifier, the second d.c. supply being in a forward position with respect to the first high-tension d.c. supply.
Claims1
An arc generating electrical system adapted for use in an inert gas atmosphere metal casting apparatus, which system comprises:
- a first high-tension d.c. supply having an output circuit in which arc generating electrodes and a high voltage rectifier are connected in series;
- said high-voltage rectifier being at the forward position with respect to said first d.c. supply;
- a second high-tension d.c. supply connected in parallel to said high-voltage rectifier;
- said second d.c. supply being at the forward position with respect to said first d.c. supply;
- and,
- said high-voltage rectifier having a short circuit in parallel therewith, wherein said short circuit has a switch closable so as to complete said short circuit while said first d.c. supply applies voltage to its output circuit in an unpulsed and continuous manner and, a relay is connected in series to said high voltage rectifier so as to close said switch when said relay is energized and to simultaneously shut off said second d.c. supply.
Dependencies are inferred from the claim text.