CN201466723U - Electric device for improving quality of working power grid of electric arc furnace - Google Patents
Electric device for improving quality of working power grid of electric arc furnace Download PDFInfo
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- CN201466723U CN201466723U CN2009200906398U CN200920090639U CN201466723U CN 201466723 U CN201466723 U CN 201466723U CN 2009200906398 U CN2009200906398 U CN 2009200906398U CN 200920090639 U CN200920090639 U CN 200920090639U CN 201466723 U CN201466723 U CN 201466723U
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- 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
- Y02E40/40—Arrangements for reducing harmonics
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Abstract
The utility model discloses an electric device for improving the quality of a working power grid of an electric arc furnace, which belongs to the field of electric control and mainly relates to an electric device capable of eliminating influences on power grid quality and damages to the working environment of control equipment during the operation of the electric arc furnace in the casting industry. The electric device comprises an arc current signal acquisition part (A), an arc voltage signal acquisition part (B) and signal transducers; a high-voltage arc current transformer (1) is connected with a surge absorbing damping resistor (2) in parallel to protect a current signal transducer (4); a resistance-capacitance absorbing device and a damping resistor (9) are arranged in an arc voltage acquisition circuit to ensure a stable arc voltage signal enters an isolation transformer (14); and both the primary side and the secondary side of the isolation transformer is connected with a piezoresistor in parallel, insurance terminals are connected to the circuits in series respectively to protect the isolation transformer, a voltage signal transducer and the analog signal acquisition part E of a core control module.
Description
Technical field
The utility model belongs to the Electrical Control Technology field, relates generally to a kind ofly in the casting industry to eliminate arc furnace when work to power grid quality influence and electric device that the control appliance operational environment is destroyed.
Background technology
The 1970s and 1980s in 20th century, furnace wall and bell water-cooled, oxygen blast, spray carbon, foam remove the gred, off-centre is come out of the stove series of new techniques such as technology because arc furnace has adopted, obtained tangible technical advantage at the casting smelting industry, compared in similar smelting equipment and have stronger competitiveness.Three-phase ac electric arc furnace is modal direct arc furnace, its operation principle is: several ten thousand volts high voltage source is after the chokes reactor enters the arc furnace special transformer, by regulating the special transformer gear, the arc furnace single-phase voltage is reduced between the 140V to 260V, and line voltage is about 380V; Directly voltage is delivered on the artificial carbonaceous electrodes of three-phase of arc furnace body of heater by the special transformer secondary terminals then, have control appliance that three electrodes realize to be risen or drop action according to the production technology needs in body of heater, then electrode is pulled out electric arc in place and electric energy is converted into heat energy the raw materials for metallurgy in the body of heater is melted; The temperature conditions that raw material reaches technological requirement imposes technological operations such as transferring carbon, oxygen blast afterwards again, treats all technical parameters PROCESS FOR TREATMENT that changes next step afterwards over to up to standard, and so far arc furnace part technology is finished.
Yet arc furnace can produce adverse effect factors such as high order harmonic component, voltage flicker, voltage fluctuation when operate as normal, electrical network is caused serious impact and interference; These factors have all seriously influenced the safety of low-pressure section control appliance, directly influence its working life; Simultaneously because the field digital signal and the analog signal of the core controller collection of control arc furnace action all are weak electric signals, very easily be subjected to the interference of the forceful electric power magnetic signal that surge voltage produces in the arc furnace production process, thereby may produce misoperation, light then influence the smelting quality of arc furnace, heavy then may cause scrapping even the injures and deaths of the damage of body of heater or the person of molten steel, bring great loss and injury to the enterprises and individuals.
Main interference signal analysis to control appliance is:
1. voltage flicker and fluctuation: ac arc furnace is the very big load of power supply grid, and ac arc furnace is in operation and often produces unexpected strong voltge surge, causes the rapid fluctuations of line voltage, and frequency is 0.1～30Hz; This interference can cause the extremely unstable of line voltage, may cause the damage of arc voltage, arc stream signal pickup assembly, even cause burning of kernel control module, causes scrapping of whole stove molten steel, causes enormous economic loss.
2. high order harmonic component: ac arc furnace its electric current in steelmaking process can produce non-sine distortion and each harmonic, and electrical network is caused interference; The direct result of this interference is the arc voltage that causes control appliance to gather, the distortion of arc stream signal or the falseness input of digital signal, causes the misoperation of core control equipment, ill effects such as electrode fracture, equipment burnout.
Existing solution is: adopt active filter " to claim distribution static compensator DSTATCOM abroad ", the advantage of this scheme is: the response time is fast, can reduce compensation capacity; Volume is little, and is in light weight, and consumable material is few, and running wastage is little; Good wave filtering effect is not influenced by mains frequency, and control performance is strong, can realize control voltage fluctuation, flickering, the effect of concrete burning voltage; While is filtering high order harmonic component effectively also, the compensation power factor; Yet the distinct disadvantage of this method is: semiconductor element be manufactured on technical and control theory on also need further perfect, the initial investment cost height that costs an arm and a leg, plant maintenance must be carried out special technical training to the staff.
Summary of the invention
In order to overcome the deficiency in the background technology, the purpose of this utility model is to propose a kind of electric device that improves arc furnace work power grid quality, can be rapidly when unusual operating state shutoff signal acquisition circuit efficiently, protect follow-up signal collecting device, avoid great device damage and production to incur loss; The equipment one-time investment significantly reduces, and protection is reliable, safeguards that to restore protection after simple, the fault quick, has improved production efficiency, has improved production environment.
For achieving the above object, the technical solution adopted in the utility model is as follows:
A kind of electric device that improves arc furnace work power grid quality comprises arc stream signals collecting part, arc voltage signals collecting part, signal transmitting device; Described arc stream signals collecting part absorbs damping resistance by high-tension arc current transformer surge in parallel, surge absorbs damping resistance and absorbs unusual current fluctuation in the arc stream loop, the arc stream signal enters series electrical flow pattern signal transmitting device after the series current table, by this set protective current type signal transmitting device; Described arc voltage signals collecting part directly is provided with resistance and the electric capacity that the capacitance-resistance absorption plant is promptly connected at arc voltage acquisition circuit leading portion, seals in voltmeter, fuse then after damping resistance enters isolating transformer; Damping resistance can absorption portion surging signal eliminate the high order harmonic component that produces in the arc furnace smelting procedure, make the voltage signal of collection more approaching with the actual arc voltage signal in the scene; The piezo-resistance of high rating electrical in parallel seals in the insurance terminal in the loop between the input voltage of the primary side of isolating transformer, plays the function of protection isolating transformer and voltage-type signal transmitting device; The secondary side of isolating transformer is the highly sensitive piezo-resistance of low rated value in parallel between the voltage of output also, seal in the terminal of band fuse protection in the loop, realize the function of the collection of simulant signal part E of protection voltage-type signal transmitting device and kernel control module; Described signal transmitting device is current mode signal transmitting device, voltage-type signal transmitting device, and the signal of arc stream signals collecting part, arc voltage signals collecting part is gathered into the signal transmitting device.
The described electric device that improves arc furnace work power grid quality, the no-load voltage ratio of isolating transformer are 1: 1.
Owing to used technique scheme, the utlity model has following superiority:
A kind of electric device that improves arc furnace work power grid quality by certain subharmonic or above subharmonic are formed low impedance path, reaches the effect that suppresses high order harmonic component; Can effectively protect simultaneously the infringement of voltage fluctuation to signal pickup assembly and control nucleus module; The utlity model has small investment, efficient height, advantage such as simple in structure and easy to maintenance, easy to utilize.
Description of drawings
Fig. 1 is an electrical principle schematic diagram of the present utility model.
Among the figure: A, arc stream signals collecting part; B, arc voltage signals collecting part; C, three phase mains inlet wire; D, smelting furnace body of heater; The collection of simulant signal part of E, kernel control module; The earth connection of PE, equipment communicates with the shell of body of heater; 1, high-tension arc current transformer; 2, surge absorbs damping resistance; 3, ammeter; 4, current mode signal transmitting device; 5, resistance; 6, electric capacity; 7, fuse; 8, voltmeter; 9, damping resistance; 10, the piezo-resistance of high rating electrical; 11, the low highly sensitive piezo-resistance of rated value; 12, the terminal of band fuse protection; 13, voltage-type signal transmitting device; 14, isolating transformer; 15, insurance terminal.
Embodiment
With real protection function in the electrical schematic diagram the utility model is further specified:
As shown in Figure 1: a kind of electric device that improves arc furnace work power grid quality comprises arc stream signals collecting part A, arc voltage signals collecting part B, signal transmitting device; C is the three phase mains inlet wire, and D is the smelting furnace body of heater, and the earth connection of PE indication equipment communicates with the shell of body of heater; In arc stream signals collecting part: absorb damping resistance 2 by high-tension arc current transformer 1 surge in parallel, the current signal discrepancy surge that is collected by high-tension arc current transformer 1 absorbs damping resistance 2, surge absorbs damping resistance 2 and absorbs unusual current fluctuation in the arc stream loop, the arc stream signal enters series electrical flow pattern signal transmitting device 4 after series current table 3, by this set protective current type signal transmitting device 4; In arc voltage signals collecting part, directly resistance 5 and the electric capacity 6 that the capacitance-resistance absorption plant is promptly connected is set at arc voltage acquisition circuit leading portion, the capacitance-resistance absorption plant will suppress fluctuating widely of arc voltage signal, seal in voltmeter 8, fuse 7 then after damping resistance 9 enters no-load voltage ratio is 1: 1 isolating transformer 14, the bigger damping resistance of resistance 9 can absorption portion surging signal eliminate the high order harmonic component that produces in the arc furnace smelting procedure, make the voltage signal of collection more approaching with the actual arc voltage signal in the scene; The piezo-resistance 10 of high rating electrical in parallel between the input voltage of the primary side of isolating transformer 14, seal in insurance terminal 15 in the loop, when voltage fluctuation surpasses the rated value of piezo-resistance 10 of high rating electrical, the piezo-resistance 10 of high rating electrical is breakdown, isolating transformer 14 primary side short circuit currents raise rapidly, cause the insurance terminal 15 or fuse 7 fusing of the small amount definite value among the figure, play the function of protection isolating transformer 14 and voltage-type signal transmitting device 13; The secondary side of isolating transformer 14 is the highly sensitive piezo-resistance 11 of low rated value in parallel between the voltage of output also, seal in the terminal 12 of band fuse protection in the loop, when abnormal ascending appears in the output voltage of secondary side, will promptly puncture the low highly sensitive piezo-resistance 11 of rated value, thereby the terminal 12 of the band fuse protection among the fusing figure, the function of the collection of simulant signal part E of realization protection voltage-type signal transmitting device 13 and kernel control module; The signal of arc stream signals collecting part, arc voltage signals collecting part is gathered in the signal transmitting device.
Claims (2)
1. an electric device that improves arc furnace work power grid quality is characterized in that; Described electric device comprises arc stream signals collecting part (A), arc voltage signals collecting part (B), signal transmitting device; Described arc stream signals collecting part (A) absorbs damping resistance (2) by high-tension arc current transformer (1) surge in parallel, surge absorbs damping resistance (2) and absorbs unusual current fluctuation in the arc stream loop, the arc stream signal enters series electrical flow pattern signal transmitting device (4) afterwards through series current table (3), by this set protective current type signal transmitting device (4); Described arc voltage signals collecting part is provided with resistance (5) and the electric capacity (6) that the capacitance-resistance absorption plant is promptly connected at arc voltage acquisition circuit leading portion, seals in voltmeter (8), fuse (7) then after damping resistance (9) enters isolating transformer (14); The surging signal of damping resistance (9) meeting absorption portion is eliminated the high order harmonic component that produces in the arc furnace smelting procedure, makes the voltage signal of collection more approach on-the-spot actual arc voltage signal; The piezo-resistance (10) of high rating electrical in parallel between the input voltage of the primary side of isolating transformer (14) seals in insurance terminal (15) in the loop, play the function of protection isolating transformer (14) and voltage-type signal transmitting device (13); The secondary side of isolating transformer (14) is the highly sensitive piezo-resistance of low rated value (11) in parallel between the voltage of output also, seal in the terminal (12) of band fuse protection in the loop, realize the function of the collection of simulant signal part (E) of protection voltage-type signal transmitting device (13) and kernel control module; Described signal transmitting device is current mode signal transmitting device (4), voltage-type signal transmitting device (13), and the signal of arc stream signals collecting part (A), arc voltage signals collecting part (B) is gathered into the signal transmitting device.
2. a kind of electric device that improves arc furnace work power grid quality according to claim 1 is characterized in that; The no-load voltage ratio of isolating transformer (14) is 1: 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200906398U CN201466723U (en) | 2009-06-03 | 2009-06-03 | Electric device for improving quality of working power grid of electric arc furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009200906398U CN201466723U (en) | 2009-06-03 | 2009-06-03 | Electric device for improving quality of working power grid of electric arc furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201466723U true CN201466723U (en) | 2010-05-12 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009200906398U Expired - Fee Related CN201466723U (en) | 2009-06-03 | 2009-06-03 | Electric device for improving quality of working power grid of electric arc furnace |
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| CN (1) | CN201466723U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872965A (en) * | 2010-06-18 | 2010-10-27 | 中国科学院电工研究所 | Current-limiting energy storage circuit and control method thereof |
| CN102394486A (en) * | 2011-12-13 | 2012-03-28 | 施耐德万高（天津）电气设备有限公司 | Protection module used for double power switch controller |
-
2009
- 2009-06-03 CN CN2009200906398U patent/CN201466723U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101872965A (en) * | 2010-06-18 | 2010-10-27 | 中国科学院电工研究所 | Current-limiting energy storage circuit and control method thereof |
| CN101872965B (en) * | 2010-06-18 | 2014-01-22 | 中国科学院电工研究所 | Current-limiting energy storage circuit and control method thereof |
| CN102394486A (en) * | 2011-12-13 | 2012-03-28 | 施耐德万高（天津）电气设备有限公司 | Protection module used for double power switch controller |
| CN102394486B (en) * | 2011-12-13 | 2014-01-08 | 施耐德万高（天津）电气设备有限公司 | Protection module used for double power switch controller |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100512 Termination date: 20140603 |