C - Chemistry – Metallurgy – 21 – D
Patent
C - Chemistry, Metallurgy
21
D
38/19, 148/28, 2
C21D 1/38 (2006.01) C23C 8/36 (2006.01) H01J 37/32 (2006.01) H02H 1/00 (2006.01) H02H 3/10 (2006.01) H05B 7/16 (2006.01) H02H 7/00 (2006.01)
Patent
CA 1093435
ABSTRACT Metallurgical treatment using a glow discharge in which a glow discharge is formed in a treatment vessel. The operating current of the glow discharge is interrupted briefly in the event of electric arc formation so to extinguish the arc. A control signal is produced to cut-off completely the operating current of the glow discharge in the event of a short circuit occurring. The control signal is produced by comparing the operating current with a current threshold value and the operating voltage with a voltage threshold value. In one embodiment the control signal is produced when the operating current is greater than the threshold current and the operating voltage has not exceeded the threshold voltage for a period longer than the period required to detect and extinguish and electric arc. In another embodiment, the control signal is produced when the operating current is greater than the threshold current and the operating voltage is less than the electric arc voltage.
271942
Klockner Ionon Gmbh
Marks & Clerk
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