GB1415634A - Power control means for a single phase induction melting or heating furnace - Google Patents

Power control means for a single phase induction melting or heating furnace

Info

Publication number
GB1415634A
GB1415634A GB1603474A GB1603474A GB1415634A GB 1415634 A GB1415634 A GB 1415634A GB 1603474 A GB1603474 A GB 1603474A GB 1603474 A GB1603474 A GB 1603474A GB 1415634 A GB1415634 A GB 1415634A
Authority
GB
United Kingdom
Prior art keywords
capacitors
furnace
thyristors
voltage
single phase
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
GB1603474A
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.)
Park Ohio Holdings Inc
Original Assignee
Ajax Magnethermic Corp
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 Ajax Magnethermic Corp filed Critical Ajax Magnethermic Corp
Publication of GB1415634A publication Critical patent/GB1415634A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00—Circuit arrangements for ac mains or ac distribution networks
    • H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
    • H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
    • H02J3/1835—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control
    • H02J3/1864—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators with stepless control wherein the stepless control of reactive power is obtained by at least one reactive element connected in series with a semiconductor switch
    • 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
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
    • Y02E40/10—Flexible AC transmission systems [FACTS]

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • General Induction Heating (AREA)
  • Furnace Details (AREA)

Abstract

1415634 Supply systems for induction furnaces AJAX MAGNETHERMIC CORP 10 April 1974 [24 Sept 1973] 16034/74 Heading H2H A single phase induction furnace 10 is provided with capacitors C 1 fixedly connected in parallel therewith and capacitors C 2 which are selectively connected in parallel therewith by means of baok-to-baok thyristors R 1 , and capacitors C 3 which are selectively connected in series therewith by means of back-to-back thyristors R 2 , the capacitors C 1 , C 2 serving to set the phase angle between the voltage V 1 across the furnace 10 and the voltage V 2 across the capacitors C 3 and thyristors R 2 thereby setting the permissible range of power within which the furnace may operate as the impedance of the furnace varies during a work cycle and the capacitors C 3 setting the furnace voltage and hence the power at which the furnace operates within the range. The necessary firing pulses for the thyristors R 1 , R 2 are developed by means of firing control units 13, 14 respectively and in a further embodiment the phase angle between the voltages V 1 , V 2 is held constant for varying load impedance by further devices which control the units 13, 14. If desired the thyristors may be replaced by triacs.
GB1603474A 1973-09-24 1974-04-10 Power control means for a single phase induction melting or heating furnace Expired GB1415634A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US00400034A US3821456A (en) 1973-09-24 1973-09-24 Power control means for a single phase induction melting or heating furnace

Publications (1)

Publication Number Publication Date
GB1415634A true GB1415634A (en) 1975-11-26

Family

ID=23581955

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1603474A Expired GB1415634A (en) 1973-09-24 1974-04-10 Power control means for a single phase induction melting or heating furnace

Country Status (4)

Country Link
US (1) US3821456A (en)
JP (1) JPS5425666B2 (en)
CA (1) CA1009697A (en)
GB (1) GB1415634A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120872A (en) * 1982-05-18 1983-12-07 Gen Electric Capacitive voltage dropper
GB2121248A (en) * 1982-05-18 1983-12-14 Gen Electric Capacitive voltage dropper
GB2121625A (en) * 1982-05-18 1983-12-21 Gen Electric Capacitive voltage dropper
US4447764A (en) * 1982-05-18 1984-05-08 General Electric Company Power supply for low-voltage incandescent lamp and like load
US4516056A (en) * 1982-05-18 1985-05-07 General Electric Company Capacitively ballasted low voltage incandescent lamp
US4525651A (en) * 1982-05-18 1985-06-25 General Electric Company Capacitively ballasted low voltage incandescent lamp
GB2294821A (en) * 1994-11-04 1996-05-08 Gec Alsthom Ltd Multilevel converter

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4037044A (en) * 1975-08-04 1977-07-19 Ajax Magnethermic Corporation Power control system for single phase induction melting or heating furnace
US4139723A (en) * 1977-04-21 1979-02-13 Ajax Magnethermic Corporation Power control unit for a single phase load with slightly changing impedances
US4280038A (en) * 1978-10-24 1981-07-21 Ajax Magnethermic Corporation Method and apparatus for inducting heating and melting furnaces to obtain constant power
US4417194A (en) * 1980-09-18 1983-11-22 The Charles Stark Draper Laboratory, Inc. Induction generator system with switched capacitor control
US4356440A (en) * 1980-09-18 1982-10-26 The Charles Stark Draper Laboratory, Inc. Power factor correction system
US4525665A (en) * 1982-08-06 1985-06-25 Smalley Daniel S Induction furnace monitor
US4612498A (en) * 1982-08-06 1986-09-16 Smalley Daniel S Induction furnace fault locator
US4488199A (en) * 1982-09-27 1984-12-11 General Electric Company Protection circuit for capacitive ballast
US4644272A (en) * 1984-07-31 1987-02-17 Republic Steel Corporation Hot annealed weld inspection
CN101010848B (en) * 2004-08-27 2010-04-28 Abb研究有限公司 Method and device for electric power flow control in high-voltage grid
SE527686C2 (en) * 2004-10-29 2006-05-09 Abb Research Ltd Electric power flow control
WO2006065189A1 (en) * 2004-12-16 2006-06-22 Abb Research Ltd Electric power flow control
WO2007097696A1 (en) * 2006-02-23 2007-08-30 Abb Research Ltd Control of power flow in a transmission line
EP2005552A1 (en) * 2006-03-28 2008-12-24 ABB Research Ltd A device and a method for control of power flow in a transmission line

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2120872A (en) * 1982-05-18 1983-12-07 Gen Electric Capacitive voltage dropper
GB2121248A (en) * 1982-05-18 1983-12-14 Gen Electric Capacitive voltage dropper
GB2121625A (en) * 1982-05-18 1983-12-21 Gen Electric Capacitive voltage dropper
US4447764A (en) * 1982-05-18 1984-05-08 General Electric Company Power supply for low-voltage incandescent lamp and like load
US4447765A (en) * 1982-05-18 1984-05-08 General Electric Company Power supply for low voltage incandescent lamp
US4516056A (en) * 1982-05-18 1985-05-07 General Electric Company Capacitively ballasted low voltage incandescent lamp
US4525651A (en) * 1982-05-18 1985-06-25 General Electric Company Capacitively ballasted low voltage incandescent lamp
GB2294821A (en) * 1994-11-04 1996-05-08 Gec Alsthom Ltd Multilevel converter

Also Published As

Publication number Publication date
JPS5058645A (en) 1975-05-21
JPS5425666B2 (en) 1979-08-29
US3821456A (en) 1974-06-28
CA1009697A (en) 1977-05-03

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee