Secondary circuit with variable impedance for electric arc furnaces
Patent 5715273 Issued on February 3, 1998. Estimated Expiration Date: 
April 15, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 15, 2016. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2368998 3366725 3431344 3483300 3835232 3898707 Conductor arrangement for a three-phase electric arc furnace Patent #: 4425658 InventorsAssigneeApplicationNo. 633308 filed on 04/15/1996US Classes:373/103, Cable or cable suspension arrangement373/93, Composite (e.g., water cooled body with carbon tip)373/105By changing arc lengthExaminersPrimary: Hoang, Tu BaAttorney, Agent or FirmForeign Patent References
International ClassH05B 007/11Foreign Application Priority Data1995-04-14 ITAbstractA secondary circuit having a variable impedance for electric arc furnaces of a type working with alternating current, which is associated with a transformer (11) is disclosed. A secondary circuit comprises at least one rigid connection (12) connected to the outputs (16) of the transformer (11), flexible cables (13) connected through rigid connection elements (29, 129) at first end to the rigid connection (12) and at the other end to specific electrodes (15). At least one branch of the secondary circuit (10) corresponds to a specific phase including at least one of the respective rigid components (12, 17, 29, 129) having at least two parts reciprocally positionable in an adjustable manner according to the required value of overall reactance of the specific branch of the secondary circuit (10) comprising that rigid component (12, 17, 29, 129). | |
