GB770997A - Improvements in and relating to arc furnace control systems - Google Patents

Improvements in and relating to arc furnace control systems

Info

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
Application number
GB4221/54A
Inventor
Owen Stevenson Steele
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB4221/54A priority Critical patent/GB770997A/en
Publication of GB770997A publication Critical patent/GB770997A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H05ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05BELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B7/00Heating by electric discharge
    • H05B7/02Details
    • H05B7/144Power supplies specially adapted for heating by electric discharge; Automatic control of power, e.g. by positioning of electrodes
    • H05B7/148Automatic control of power
    • H05B7/152Automatic control of power by electromechanical means for positioning of electrodes
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00Technologies related to metal processing
    • Y02P10/25Process 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.
GB4221/54A 1954-02-12 1954-02-12 Improvements in and relating to arc furnace control systems Expired GB770997A (en)

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)

Similar Documents

Publication Publication Date Title
GB770997A (en) Improvements in and relating to arc furnace control systems
US2834931A (en) Means for supplying intermittent overload currents from voltage regulating rectifier sets
US3376374A (en) Polyphase arc furnace with control system to raise one electrode prior to all electrodes striking an arc
US2869067A (en) Protective apparatus for electric current distributing systems
GB754066A (en) Automatic load-dependent y-delta change-over system for electric induction motors
SU403527A1 (en) ШГг
SU644643A1 (en) Arrangement for shorting protection of d.c. supplied pulse-controlled electric vehicle
JPS5467655A (en) Distribution line shortage protector
FR2275922A1 (en) Phase monitor for three-phase motor - has transformers coupled one to each phase supply line and operating main protective relay
US2121644A (en) Electric furnace regulator system
GB925238A (en) Change-over device for automatic switching over from star to delta connections and vice versa depending upon load in electric motors
SU826431A1 (en) Electromagnetic contactor control device
GB895954A (en) Improvements in and relating to electrical current regulation
SU764087A1 (en) Method for controlling maximum current of rotor in synchronous alternator
GB883660A (en) Improvements in and relating to electrical protective relay systems
GB288181A (en) Improvements in or relating to electrical regulating systems
GB804101A (en) Electric power supply system and method of controlling same
JPS5495347A (en) Appartus for preventing burning of motor field coil
GB750372A (en) Improvements in or relating to alternating current arc welding equipment
GB710278A (en) Improvements relating to electric arc welding apparatus
GB632056A (en) Improvements relating to alternating electric current generators
GB793278A (en) Improved system for controlling parallel circuits supplying a common load
GB639421A (en) Improvements relating to electrode feed control apparatus
GB905012A (en) Improvements relating to circulating current protection for power transformers
GB882004A (en) Automatic breaking of arc in arc welding