GB1237834A - Method of operating a polyphase electric furnace - Google Patents
Method of operating a polyphase electric furnaceInfo
- Publication number
- GB1237834A GB1237834A GB25600/69A GB2560069A GB1237834A GB 1237834 A GB1237834 A GB 1237834A GB 25600/69 A GB25600/69 A GB 25600/69A GB 2560069 A GB2560069 A GB 2560069A GB 1237834 A GB1237834 A GB 1237834A
- Authority
- GB
- United Kingdom
- Prior art keywords
- current
- controllers
- members
- electrode
- electrodes
- 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
- H05B3/00—Ohmic-resistance heating
- H05B3/0019—Circuit arrangements
- H05B3/0023—Circuit arrangements for heating by passing the current directly across the material to be heated
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/12—Regulating voltage or current wherein the variable actually regulated by the final control device is ac
- G05F1/14—Regulating voltage or current wherein the variable actually regulated by the final control device is ac using tap transformers or tap changing inductors as final control devices
-
- 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S65/00—Glass manufacturing
- Y10S65/04—Electric heat
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Automation & Control Theory (AREA)
- Furnace Details (AREA)
- Discharge Heating (AREA)
- Control Of Electrical Variables (AREA)
- Sewing Machines And Sewing (AREA)
Abstract
1,237,834. Automatic power control of electric furnaces. KNAPSACK A. G. May 20, 1969 [May 31, 1968], No.25600/69. Heading G3R. A polyphase electric furnace such as a three phase reduction furnace is operated at a constant power input with the electrode currents maintained at equal values, the latter condition being achieved by varying the voltages between the electrodes upon the occurrence of dissymmetries in the charge resistance. In the described embodiment the electrodes 1, 2, 3 are supplied from transformers 7, 8, 9 controlled by members 4, 5, 6 of the control system shown in Fig. 2 which varies the voltage associated with the pair of electrodes having the least difference in current, for example the transformer 7 if the current difference between electrodes 1 and 2 is less than the current difference between electrodes 1 and 3. Members A---E are known controllers which function as follows: - (1) Controller A compares actual power Wa with desired power Wd to determine the output signal from controller B. (2) Controller B receives a signal Id representative of desired electrode current, which signal is varied by the output signal from controller A to produce a corresponding desired current signal I'd. (3) Controllers C 1 C 2 C 3 compare the actual current through each electrode with the desired current signal I'd, the outputs of these controllers each being applied to the pair of the members 4, 5, 6 associated with the corresponding electrode e.g. C 1 supplies members 4, 6 associated with electrode 1. (4) Controllers D 1 D 2 D 3 compare the actual electrode currents to derive corresponding difference signals each of which is supplied to an appropriate pair of the controllers E 1 E 2 E 3 (5) Controllers E 1 E 2 E 3 compare the pairs of current difference signals and control appropriate pairs of the members 4, 5, 6 to determine which of these members is to respond to an adjusting instruction produced by a corresponding controller C 1 C 2 C 3 , this determination being based upon the criterion of least current difference already defined.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19681765514 DE1765514B1 (en) | 1968-05-31 | 1968-05-31 | CONTROL DEVICE FOR OPERATING A MULTI-PHASE ELECTRIC OVEN |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1237834A true GB1237834A (en) | 1971-06-30 |
Family
ID=5698478
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB25600/69A Expired GB1237834A (en) | 1968-05-31 | 1969-05-20 | Method of operating a polyphase electric furnace |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US3573336A (en) |
| JP (1) | JPS4920014B1 (en) |
| BE (1) | BE733875A (en) |
| DE (1) | DE1765514B1 (en) |
| ES (2) | ES367625A1 (en) |
| FR (1) | FR2009786A1 (en) |
| GB (1) | GB1237834A (en) |
| NL (1) | NL142794B (en) |
| NO (1) | NO126765B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NO126288B (en) * | 1971-10-22 | 1973-01-15 | Elkem As | |
| US4580272A (en) * | 1983-06-03 | 1986-04-01 | Outokumpu Oy | Method for controlling and balancing the power in an electric furnace |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2159361A (en) * | 1936-11-30 | 1939-05-23 | Owens Illinois Glass Co | Electric furnace |
| DE841489C (en) * | 1943-08-24 | 1952-06-16 | Brown Ag | Device for feeding the electrodes of electric glass melting furnaces |
| DE888898C (en) * | 1950-06-11 | 1953-09-07 | Licentia Gmbh | Arrangement for regulating the voltage supplied to the electrodes in electrode salt bath ovens |
| DE862929C (en) * | 1951-01-30 | 1953-01-15 | Licentia Gmbh | Arrangement for temperature control on electrode salt bath ovens |
| DE1159111B (en) * | 1961-05-31 | 1963-12-12 | Siemens Ag | Device to avoid the sharp and dead phase of electric arc furnaces |
| US3431344A (en) * | 1965-11-15 | 1969-03-04 | Westinghouse Electric Corp | Control system providing supply circuit impedance balance control for electric arc furnaces |
| US3432604A (en) * | 1967-02-13 | 1969-03-11 | Allegheny Ludlum Steel | Automatic determination of arc furnace operating state |
-
1968
- 1968-05-31 DE DE19681765514 patent/DE1765514B1/en active Pending
-
1969
- 1969-05-17 JP JP44038357A patent/JPS4920014B1/ja active Pending
- 1969-05-20 GB GB25600/69A patent/GB1237834A/en not_active Expired
- 1969-05-23 ES ES367625A patent/ES367625A1/en not_active Expired
- 1969-05-27 ES ES367736A patent/ES367736A1/en not_active Expired
- 1969-05-29 US US829036A patent/US3573336A/en not_active Expired - Lifetime
- 1969-05-30 BE BE733875D patent/BE733875A/xx unknown
- 1969-05-30 NO NO02240/69A patent/NO126765B/no unknown
- 1969-05-30 NL NL696908280A patent/NL142794B/en unknown
- 1969-05-30 FR FR6917913A patent/FR2009786A1/fr not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| ES367736A1 (en) | 1971-04-16 |
| FR2009786A1 (en) | 1970-02-06 |
| DE1765514B1 (en) | 1971-08-26 |
| JPS4920014B1 (en) | 1974-05-22 |
| BE733875A (en) | 1969-12-01 |
| ES367625A1 (en) | 1971-04-16 |
| NL6908280A (en) | 1969-12-02 |
| US3573336A (en) | 1971-04-06 |
| NO126765B (en) | 1973-03-19 |
| NL142794B (en) | 1974-07-15 |
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