GB770997A - Improvements in and relating to arc furnace control systems - Google Patents
Improvements in and relating to arc furnace control systemsInfo
- Publication number
- GB770997A GB770997A GB4221/54A GB422154A GB770997A GB 770997 A GB770997 A GB 770997A GB 4221/54 A GB4221/54 A GB 4221/54A GB 422154 A GB422154 A GB 422154A GB 770997 A GB770997 A GB 770997A
- Authority
- GB
- United Kingdom
- Prior art keywords
- electrode
- relay
- surge
- circuit
- arc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
- H05B7/00—Heating by electric discharge
- H05B7/02—Details
- H05B7/144—Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
- H05B7/148—Automatic control of power
- H05B7/152—Automatic control of power by electromechanical means for positioning of electrodes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Plasma & Fusion (AREA)
- Furnace Details (AREA)
Abstract
770,997. Automatic control systems for arc furnaces. BRITISH THOMSON-HOUSTON CO., Ltd. Feb. 9, 1955 [Feb. 12, 1954], No. 4221/54. Class 38 (4). In order to prevent excessive operation of a surge-actuated circuit-breaker in the supply to an arc furnace electrode, an amplidyne generator supplying an electrode-positioning motor has a field energized when a surge exceeds a value somewhat below that at which the circuit-breaker is operated, whereby the electrode is withdrawn to tend to reduce the surge. As applied to a three-phase arc furnace, an electrode-positioning motor 7 is connected with an amplidyne generator 8 in a Ward-Leonard loop, the generator field winding 18 being energized to maintain a constant ratio of arc voltage to arc current. The circuit-breaker trip device 4 and a relay 5 are responsive to excessive electrode current signals in current transformer windings 1,' 2, 3, the relay being actuated at a lower surge value than the trip to energize a relay winding 16, and thus close a contact 26 to energize a second generator field winding 28 from a D.C. source. The motor 7 is thereby actuated to withdraw the electrodes before the trip operates to break the supply circuit. The electrodes may be separately positioned by individual motors controlled by relays responsive to the current in each phase. The operating, coils in relay 5 and trip device 4 may be connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4221/54A GB770997A (en) | 1954-02-12 | 1954-02-12 | Improvements in and relating to arc furnace control systems |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB4221/54A GB770997A (en) | 1954-02-12 | 1954-02-12 | Improvements in and relating to arc furnace control systems |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB770997A true GB770997A (en) | 1957-03-27 |
Family
ID=9773024
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB4221/54A Expired GB770997A (en) | 1954-02-12 | 1954-02-12 | Improvements in and relating to arc furnace control systems |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB770997A (en) |
-
1954
- 1954-02-12 GB GB4221/54A patent/GB770997A/en not_active Expired
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